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HomeMy WebLinkAbout2024.03.19 - Stormwater Pollution Prevention Plan STORMWATER POLLUTION PREVENTION PLAN FOR: #492 Sutton Street,North Andover, MA Home Grown Lacrosse, LLC OPERATOR(S): C.P. Berry Homes 11 Sylvan Street— Suite 2 Danvers, MA 01923 SWPPP CONTACT(S): C.P. Berry Homes Contact: Alan Berry Phone: (978) 887-1188 Email: alanjohnberry@hotmail.com SWPPP PREPARATION: Hancock Associates 34 Chelmsford Street Chelmsford, MA 01824 Contact: Brian G. Geaudreau Phone: 978-244-0110 Fax: 978-244-1133 Email: bgeaudreau@hancockassociates.com DATE OF PREPARATION: 03/11/24 Estimated Project Dates: Project Start Date: 3/26/24 Project Completion Date: March 2025 TABLE OF CONTENTS SWPP Contents SWPP Coordinator and Duties Existing Site Conditions Proposed Site Conditions Identification of Potential Stormwater Contaminants Stormwater Management Controls • Temporary and Permanent Erosion Control Practices • Construction Practices to Minimize Stormwater Contamination Maintenance Procedures • Employee Training Corporate Certification APPENDIX Stormwater Management Summary Stormwater Best Management Practices (BMP) Maintenance Logs Stormwater Construction Site Inspection Report Construction General Permit NHESP-Critical Areas & Endangered Species Map MACRIS-Historical Resources Search for Project Location Stormwater Report and Calculations Permit Site Plan Set STORMWATER POLLUTION PREVENTION PLAN This project intends to construct a 39,100±SF athletic facility with office space, accompanying parking lot and utilities on a leased lot granted by the Lawrence Municipal Airport. Said lease area is proposed to be 2.5±Acres. In 1972, Congress passed the Federal Water Pollution Control Act (FWPCA), also known as the Clean Water Act(CWA), to restore and maintain the quality of the nation's waterways. The ultimate goal was to make sure that rivers and streams were fishable, swimmable, and drinkable. In 1987, the Water Quality Act (WQA) added provisions to the CWA that allowed the EPA to govern storm water discharges from construction sites. In 2012, EPA published the final notice for the General Permit for Storm Water Discharges from Construction Activities disturbing one (1) acre or greater (Volume 77 Federal Register 12286, February 29, 2012). The general permit includes provisions for development of a Stonn Water Pollution Prevention Plan (SWPPP) to maximize the potential benefits of pollution prevention and sediment and erosion control measures at construction sites. General Permit for Storm Water Discharges from Construction Activities Link: hlicps://www ep�.:. ���/:; stun/fides/documents/2022--0ii/2022--c � --lin��l--.ermit. df Development, implementation, and maintenance of the SWPPP will provide C.P. Berry Homes. with the framework for reducing soil erosion and minimizing pollutants in storm water during construction. The SWPPP will: Define the characteristics of the site and the type of construction which will be occurring; Describe the site plan for the development to be constructed; Describe the practices that will be implemented to control erosion and the release of pollutants in storm water; Create an implementation schedule to ensure that the practices described in this SWPPP are in fact implemented and to evaluate the plan's effectiveness in reducing erosion, sediment, and pollutant levels in storm water discharged from the site; and Describe the final stabilization/termination design to minimize erosion and prevent storm water impacts after construction is complete. SWPPP CONTENT This SWPPP includes the following: Identification of the SWPPP coordinator with a description of this person's duties; Identification of the storm water pollution prevention team that will assist in implementation of the SWPPP during construction. Description of the existing site conditions including existing land use for the site (i.e., wooded areas, open grassed areas,pavement,buildings, etc.), soil types at the site, as well as the location of surface waters which are located on or next to the site (wetlands, streams, rivers, lakes,ponds, etc.); Identification of the body of water(s)which will receive runoff from the construction site, including the ultimate body of water that receives the storm water; Identification of drainage areas and potential storm water contaminants; Description of storm water management controls and various Best Management Practices (BMPs) necessary to reduce erosion, sediment and pollutants in storm water discharge; Description of the project's monitoring plan and how controls will be coordinated with construction activities; and a Description of the implementation schedule and provisions for amendment of the plan, Reporting, Inspection Criteria and Forms. SWPPP COORDINATOR AND DUTIES The construction site SWPPP coordinator for the project is C.P. Berry Homes,phone number: (978) 887-1188. C.P. Berry Homes' duties include the following: Implement the SWPPP plan with the aid of the SWPPP team; Oversee maintenance practices identified as BMPs in the SWPPP; Implement and oversee employee training; Conduct or provide for inspection and monitoring activities; Identify other potential pollutant sources and make sure they are added to the plan; Identify any deficiencies in the SWPPP and make sure they are corrected; and Ensure that any changes in construction plans are addressed in the SWPPP. Best management practices (BMP) for erosion and sedimentation control are straw wattles, haybale check dams, as necessary, temporary sediment basins, diversion swales and hydroseeding. Construction BMPs must be maintained. In developing the proposed project certain measures will be implemented to minimize impacts erosion and sedimentation could have on the surrounding resource areas. This section addresses items that involve proper construction techniques, close surveillance of workmanship, and immediate response to emergency situations. The developer must be prepared to provide whatever reasonable measures are necessary to protect the environment during construction and to stabilize all disturbed areas as soon as construction ends. EXISTING SITE CONDITIONS The subject lot is located along the eastern side of Terminal Road (AKA Airport Entrance Drive). Existing conditions include maintained grass fields, disturbed earth from removal of soil stockpiling, and a small portion of woods. The site is located in the Industrial 2 district with a portion being within the Watershed Protection District. Stormwater runoff from the site is divided between two discharge areas, the southern end of Terminal Road, Sutton Street and Old Clark Road, and the northern end of Terminal Road. The drainage directed to the northern end of Terminal Road is collected via the Lawrence Municipal Airport's drainage system. Drainage directed to the southern side of Terminal Road and Old Clark Road is collected via the Town's municipal drainage system where is discharged at various points along Osgood Street into the wetlands surrounding Lake Cochichewick. PROPOSED SITE CONDITIONS The Stormwater Management design methodology implemented for this project is intended to treat and exfiltrate runoff via a porous pavement system. This hydrologic analysis methodology will approximate pre-development peak flow rates at design points: The Northern portion of Terminal Road and the Sutton Street/Old Clark Road Drainage System. The project proposes to disturb approximately 88,000 SF± of land with 59,515 SF of that being new impervious surfaces including,porous pavement, driveways and walks, and roofs. Post-development conditions will maintain the overall drainage patterns with additional runoff from impervious surfaces being treated and attenuated by the proposed porous pavement parking lot thus leading to a decrease in total volume directed the municipal system. IDENTIFICATION OF POTENTIAL STORMWATER CONTAMINANTS The purpose of this section is to identify pollutants that could impact storm water during construction of the project. Pollutants that result from clearing, grading, excavation, and building materials and have the potential to be present in storm water runoff are listed below. This list includes information regarding material type, chemical and physical description, and the specific regulated storm water pollutants associated with each material. Potential Areas for Storm Water Contamination The following potential source areas of storm water contamination were identified and evaluated: Cleared and graded areas; Paved areas and building construction; Construction site entrance and asphalt parking area construction; and All undisturbed areas. Potential Construction Site Stormwater Pollutants Material Chemical/Physical Storm Water Pollutants Description Pesticides (insecticides, Various colored to Chlorinated hydrocarbons, fungicides, colorless liquid, organophosphates, herbicides,rodenticidespowder, pellets, or grains carbamates, arsenic Fertilizer Liquid or solid grains Nitrogen, phosphorous Plaster White granules or powder Calcium sulphate, calcium carbonate, sulfuric acid Cleaning solvents Colorless,blue, or yellow- Perchloroethylene, green methylene chloride, liquid trichloroethylene, petroleum distillates Asphalt Black solid Oil, petroleum distillates Concrete White solid Limestone, sand Glue, adhesives White or yellow liquid Polymers, epoxies Paints Various colored liquid Metal oxides, stoddard solvent, talc, calcium carbonate, arsenic Curing compounds Creamy white liquid Naphtha Wastewater from Water Soil, oil &grease, solids construction equipment washing Wood preservatives Clear amber or dark brown Stoddard solvent, liquid petroleum distillates, arsenic, copper, chromium Hydraulic oil/fluids Brown oily petroleum Mineral oil hydrocarbon Gasoline Colorless,pale brown or petroleum hydrocarbon pink Benzene, ethyl benzene, toluene, x lene, MTBE Diesel Fuel Clear, blue-green to yellow Petroleum distillate, oil & liquid grease, naphthalene, x lenes Antifreeze/coolant Clear green/yellow liquid Ethylene glycol, propylene glycol,heavy metals (copper, lead, zinc Erosion I Solid Particles I Soil, Sediment Locations of Potential Sources of Storm Water Contamination Drainage Area Contamination Potential Pollutants Potential Problem Point Cleared and Stormwater Soil erosion Erosion of soils from cleared graded areas Management and graded areas have the System, potential to discharge into Infiltration the existing drainage system System, ISLF Paved areas and Stormwater Plaster, cleaning Accidental spills of paints building Management solvents, asphalt, and cleaning solvents, construction System, concrete,paints, leaking hydraulic oil and Infiltration hydraulic oil, antifreeze from construction System, ISLF gasoline, equipment, gasoline and antifreeze, soil diesel fuel spills while erosion, fertilizer, fueling construction pesticides, glue equipment, erosion of adhesives, curing exposed and stockpiled compounds, wood soils, and degradation of preservatives, scrap dry wall can kerosene potentially contaminate storm water. Asphalt chemicals can be released to storm water if a rain event occurs before curing is complete. Construction Stormwater Asphalt, hydraulic Leaking hydraulic oil and site entrance Management oil, gasoline, antifreeze from clearing, System, antifreeze, soil grading and asphalt Infiltration erosion application construction System, ISLF equipment. Gasoline and diesel fuel spills while fueling construction equipment, and erosion of exposed and stockpiled soils. Asphalt chemicals can be released to storm water if a rain event occurs before curing is complete. Tracking of soil into the road through the construction site entrance. STORMWATER MANAGEMENT CONTROLS The purpose of this section is to identify the types of temporary and permanent erosion and sediment controls that will be used during construction activities. The controls will provide soil stabilization for disturbed areas and structural controls to divert runoff and remove sediment. This section will also address control of other potential ston-n water pollutant sources such as construction materials (paints, concrete dust, solvents,plaster), waste disposal, control of vehicle traffic, and sanitary waste disposal. Temporary and Permanent Erosion Control Practices To prevent soil from washing into the adjacent grass field, bordering vegetated wetlands, existing playground or the undisturbed areas of the site, the following BMPs will be implemented: Prior to the start of any demolition, grading, or construction, staked straw wattle and silt fence are to be installed along the limit of work as depicted on the plans. A stabilized construction entrance will be constructed to reduce vehicle tracking of sediments as depicted on the plans and details. Temporary sedimentation basins are to be constructed, where necessary, to control sediment from entering drainage/infiltration system. Basins are not to be constructed in footprint of proposed infiltration system. New and loose soil on site will be scarified with a tracked vehicle by driving perpendicular to the slope, to assist in slowing the rate of surface stormwater runoff. Dump trucks hauling material from the construction site will be covered with a tarpaulin. Areas of the site, which are to be paved, will be temporarily stabilized by applying an aggregate base until asphalt is applied. Onsite paved areas will be swept as needed to remove excess mud, dirt, or rock tracked from the site. Catch basins will be installed level with binder and silt sacks will be installed inside them. When the top binder is ready to be placed, the catch basins rims shall be saw-cut and raised flush with the new pavement elevation. Overnight when the site is not in service, straw bales shall be placed in the site entrance to seal the front of the site with erosion control. Jute matting shall be placed where necessary to stabilize slopes greater than 3:1. After seeding, each area will be mulched with 4,000 pounds per acre of straw or approved equal. Construction Practices to Minimize Stormwater Contamination All waste materials will be collected and stored in a secure metal dumpster. All trash and construction debris from the site will be deposited in the dumpster. The dumpster will be emptied a minimum of twice per week or as frequent as site conditions require. No construction materials will be buried on-site. All personnel will be instructed regarding the correct procedure for waste disposal. All sanitary waste will be collected from the portable units as needed. Good housekeeping and spill control practices will be followed during construction to minimize storm water contamination from petroleum products,paints, and concrete. All vehicles on site will be monitored for leaks and receive regular preventive maintenance to reduce the chance of leakage. Petroleum products will be stored in tightly sealed containers, which, are clearly labeled. Spill kits will be included with all fueling sources and maintenance activities. Any asphalt substances used onsite will be applied according to the manufacturer's recommendation. All paint containers and curing compounds will be tightly sealed and stored when not required for use. Excess paint will not be discharged to the storm sewers, but will be properly disposed according to the manufacturer's instructions. Materials and equipment necessary for spill cleanup will be kept in the temporary material storage trailer onsite. Equipment will include, but not be limited to,brooms, dust pans, mops, rags, gloves, goggles, kitty litter, sand, saw dust, and plastic and metal trash containers. All spills will be cleaned up immediately upon discovery. Spills large enough to reach the storm sewers will be reported to the Massachusetts Department of Environmental Protection Northeast Regional Office at 1-888-304-1133. Concrete trucks will not be allowed to wash out or discharge surplus concrete or drum wash water within wetland buffer zone or on porous pavement. When testing/cleaning of water supply lines, the discharge from the tested pipe will be collected and conveyed to a completed storm water pipe system for ultimate discharge into the sedimentation basin. MAINTENANCE/INSPECTION PROCEDURES Inspections Visual inspections of all cleared and graded areas of the construction site will be performed weekly and within 12 hours of the end of a storm with rainfall amounts greater than 0.5 inches. The inspection will be conducted by the SWPPP coordinator or his/her designated storm water team members. The inspection will verify that the structural BMPs described above are in good condition and are minimizing erosion. The inspection will also verify that the procedures used to prevent storm water contamination from construction materials and petroleum products are effective. The following inspection and maintenance practices will be used to maintain erosion and sediment controls: Built up sediment will be removed from straw wattles when it has reached one-half the height of the barrier. Straw wattles will be inspected for depth of sediment, for tears, and to see that the fence posts are firmly in the ground. Temporary and permanent seeding will be inspected for bare spots, washouts, and healthy growth. Stabilized construction entrances will be inspected for sediment tracked on the road, for clean gravel, and that all traffic use the stabilized entrances when leaving the site. The maintenance inspection report will be made after each inspection. A copy of the report form is to be completed by the SWPPP coordinator and maintained on-site during the entire construction project. Following construction,the completed forms will be retained at the contractor's office, Erland Construction, Inc, for a minimum of 1 year. If construction activities or design modifications are made to the site plan, which could impact storm water, this SWPPP will be amended appropriately. The amended SWPPP will have a description of the new activities that contribute to the increased pollutant loading and the planned source control activities. Employee Training An employee-training program will be developed and implemented to educate employees about the requirements of the SWPPP. This education program will include background on the components and goals of the SWPPP and hands-on training in erosion controls, spill prevention and response, good housekeeping, proper material handling, disposal and control of waste, equipment fueling, and proper storage, washing, and inspection procedures. All employees will be trained prior to their first day on the site. STORMWATER OPERATION AND MAINTENANCE PLAN Stormwater management system owner: Home Grown Lacrosse, LLC. The party or parties responsible for operation and maintenance: Home Grown Lacrosse, LLC. Porous Pavement Frequent cleaning and maintenance are required for the pavement surface to prevent clogging as the surface acts as the pretreatment to the stone reservoir below. To keep the surface clean, frequent vacuum sweeping along with jet washing of asphalt and concrete pavement is required. No winter sanding shall be conducted on the porous surface. For proper maintenance: • Minimize salt use during winter months, •No winter sanding, • Keep landscaped areas nearby well maintained to prevent soil being transported onto the pavement, • Clean the surface at least monthly with vacuum sweeping machines, • Inspect surface after storm events to insure proper drainage, •Never reseal or repave with impermeable material, • Inspect annually for deterioration or spalling, • Monitor to ensure that the paving surface drains properly after storms—as needed • Clean surface using power washer to dislodge trapped particles and vacuum sweep area —as needed • Inspect surface annually for deterioration • Assess exfiltration capability at least once a year. When exfiltration capacity is found to decline, implement measures from the Operation and Maintenance plan to restore original exfiltration capacity. Grass Swale Inspect semi-annually the first year, and at least once a year thereafter. Inspect the grass for growth and the side slopes for signs of erosion and formation of rills and gullies.Plant an alternative grass species if the original grass cover is not successfully established.If grass growth is impaired by winter road salt or other deicer use,re- establish the grass in the spring. Trash/Debris Removal:Remove accumulated trash and debris prior to mowing. Sediment Removal: Check on a yearly basis and clean as needed.Use hand methods(i.e.,a person with a shovel) when cleaning to minimize disturbance to vegetation and underlying soils. Outlet Control Structure Inspect or clean outlet control structures four times per year at the end of the foliage and snow removal seasons. Sediments must also be removed when the depth of deposits is greater than or equal to one half the depth from the bottom of the lowest pipe in the basin. Vacuum trucks are to be used to remove trapped sediment and supernatant. Although catch basin debris often contains concentrations of oil and hazardous materials such as petroleum hydrocarbons and metals, MassDEP classifies them as solid waste. Any contaminated materials must be evaluated in accordance with the Hazardous Waste Regulations, 310 CMR 30.00, and handled as hazardous waste. MassDEP regulations prohibit landfills from accepting materials that contain free draining liquids. Roof Drain Leaders Routine roof inspections shall be performed two times per year. The roof shall be kept clean and free of debris, and the roof drainage system shall be kept clear. Gutter and downspouts shall be cleaned at least twice per year, or mor frequently as necessary. STORMWATER BEST MANAGEMENT PRACTICES (BMP) YEARLY MAINTENANCE LOG See Operation and Maintenance Plan for required frequency. Site Owner: Site Address: Stormwater BMP's On-site: Porous Pavement Maintenance Schedule: Annually or after major storm event Date Inspector Condition Maintenance Performed* Grass Swale Maintenance Schedule: Once per year minimum Date Inspector Condition Maintenance Date Performed* Outlet Control Structure Maintenance Schedule: Four times per year minimum Date Inspector Condition Maintenance Date Performed* Roof Drain Leaders Maintenance Schedule: Two times per year(minimum) Date Inspector Condition Maintenance Date Performed* Stormwater Construction Site Inspection Report General Information Project Name NPDES Tracking No. Location Date of Inspection Start/End Time Inspector's Name(s) Inspector's Title(s) Inspector's Contact Information Inspector's Qualifications Describe present phase of construction Type of Inspection: ❑ Regular ❑ Pre-storm event ❑ During storm event ❑ Post-storm event Weather Information Has there been a storm event since the last inspection? ❑Yes ❑No If yes,provide: Storm Start Date&Time: Storm Duration(hrs): Approximate Amount of Precipitation(in): Weather at time of this inspection? ❑ Clear ❑Cloudy ❑ Rain ❑ Sleet ❑ Fog ❑ Snowing ❑ High Winds ❑ Other: Temperature: Have any discharges occurred since the last inspection? ❑Yes ❑No If yes, describe: Are there any discharges at the time of inspection? ❑Yes ❑No If yes, describe: Site-specific BMPs • Number the structural and non-structural BMPs identified in your SWPPP on your site map and list them below (add as many BMPs as necessary). Carry a copy of the numbered site map with you during your inspections. This list will ensure that you are inspecting all required BMPs at your site. • Describe corrective actions initiated, date completed, and note the person that completed the work in the Corrective Action Lo . BMP BMP BMP Corrective Action Needed and Notes Installed? Maintenance Required? 1 ❑Yes ❑No ❑Yes ❑No 2 ❑Yes ❑No ❑Yes ❑No 3 ❑Yes ❑No ❑Yes ❑No 4 ❑Yes ❑No ❑Yes ❑No 5 ❑Yes ❑No ❑Yes ❑No BMP BMP BMP Corrective Action Needed and Notes Installed? Maintenance Required. 6 ❑Yes ❑No ❑Yes ❑No 7 ❑Yes ❑No ❑Yes ❑No 8 ❑Yes ❑No ❑Yes ❑No 9 ❑Yes ❑No ❑Yes ❑No 10 ❑Yes ❑No ❑Yes ❑No Overall Site Issues Below are some general site issues that should be assessed during inspections. Customize this list as needed for conditions at your site. BMP/activity Implemente Maintenance Corrective Action Needed and Notes d? Required? 1 Are all slopes and ❑Yes ❑No ❑Yes ❑No disturbed areas not actively being worked properly stabilized? 2 Are natural resource ❑Yes ❑No ❑Yes ❑No areas (e.g., streams, wetlands,mature trees, etc.)protected with barriers or similar BMPs? 3 Are perimeter controls ❑Yes ❑No ❑Yes ❑No and sediment barriers adequately installed (keyed into substrate) and maintained? 4 Are discharge points ❑Yes ❑No ❑Yes ❑No and receiving waters free of any sediment deposits? 5 Are storm drain inlets ❑Yes ❑No ❑Yes ❑No properly protected? 6 Is the construction exit ❑Yes ❑No ❑Yes ❑No preventing sediment from being tracked into the street? 7 Is trash/litter from ❑Yes ❑No ❑Yes ❑No work areas collected and placed in covered dumpsters? 8 Are washout facilities ❑Yes ❑No ❑Yes ❑No (e.g.,paint, stucco, concrete) available, clearly marked, and maintained? BMP/activity Implemente Maintenance Corrective Action Needed and Notes d? Required? 9 Are vehicle and ❑Yes ❑No ❑Yes ❑No equipment fueling, cleaning, and maintenance areas free of spills,leaks, or any other deleterious material? 10 Are materials that are ❑Yes ❑No ❑Yes ❑No potential stormwater contaminants stored inside or under cover? 11 Are non-stormwater ❑Yes ❑No ❑Yes ❑No discharges(e.g., wash water, dewatering) properly controlled? 12 (Other) ❑Yes ❑No ❑Yes ❑No Non-Compliance Describe any incidents of non-compliance not described above: CERTIFICATION STATEMENT "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." Print name and title: Signature: NPDES A UNITED STATES ENVIRONMENTAL PROTECTION AGENCY FORM FORM �A"EPA WASHINGTON,DC 20460 Approved OMB No. 3510-9 NOTICE OF INTENT(Not)FOR THE 2022 NPDES CONSTRUCTION PERMIT 2040-0305 Expires on 02/28/2025 This collection of information is approved by OMB under the Paperwork Reduction Act,44 U.S.C.3501 et seq.(OMB Control No.2040-0305).Responses to this collection of information are mandatory in accordance with this permit and EPA NPDES regulations(40 CFR 122.28(b)(2)).An agency may not conduct or sponsor,and a person is not required to respond to,a collection of information unless it displays a currently valid OMB control number.The public reporting and recordkeeping burden for this collection of information are estimated to average 1.1 to 19.6 hours per response.Send comments on the Agency's need for this information,the accuracy of the provided burden estimates and any suggested methods for minimizing respondent burden to the Regulatory Support Division Director,U.S.Environmental Protection Agency(2821T),1200 Pennsylvania Ave.,NW, Washington,D.C.20460,Include the OMB control number in any correspondence.Do not send the completed form to this address. Permit Information NPDES ID:MAR10054H State/Territory to which your project/site is discharging:MA Is your project/site located on federally recognized Indian Country lands?No Are you requesting coverage under this Not as a"Federal Operator"or a"Federal Facility"as defined in Appendix A(https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-appendix-a- definitions.pdf)? .. ..- ....... No Have stormwater discharges from your current construction site been covered previously under an NPDES permit?No Will you use polymers,flocculants,or other treatment chemicals at your construction site?No Has a Stormwater Pollution Prevention Plan(SWPPP)been prepared in advance of filling this Not,as required?Yes Are you able to demonstrate that you meet one of the criteria listed in Appendix D(https://www.epa.gov/systemtfiles/documents/2022-01/2022cgp-final-appendix-d-endangered-species-protection.pdf) with respect to protection of threatened or endangered species listed under the Endangered Species Act(ESA)and federally designated critical habitat? Yes Have you completed the screening process in Appendix E(https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-appendix-e-historic-properties.pdf)relating to the protection of historic properties? Yes Indicating"Yes"below,I confirm that I understand that CGP only authorized the allowable stormwater discharges in Part 1.2.1 and the allowable non-stormwater discharges listed in Part 1.2.2.Any discharges not expressly authorized in this permit cannot become authorized or shielded from liability under CWA section 402(k)by disclosure to EPA,state or local authorities after issuance of this permit via any means,Including the Notice of Intent(NOI)to be covered by the permit,the Stormwater Pollution Prevention Plan(SWPPP),during an Inspection,etc.If any discharges requiring NPDES permit coverage other than the allowable stop mwater and non-stormwater discharges listed in Parts 1.2.1 and 1.2.2 will be discharged,they must be covered under another NPDES permit. Yes Operator Information Operator Information Operator Name:Home Grown Lacrosse,LLC Operator Mailing Address: Address Line 1:400 Osgood Street Address Line 2: City:North Andover ZIP/Postal Code:01845 State/Province:MA County or Similar Division:Middlesex Country:US Operator Point of Contact Information First Name Middle Initial Last Name:Bryan B—ill Title:Owner Phone:978-208-2300 Ext.: Email:Bryan@hgrlacrosse.com NOI Preparer Information G This Not is being prepared by someone other than the certifier. First Name Middle Initial Last Name:Brian Geaudreau Organization:Hancock Associates Phone:978-224-0110 Ext.: Email:beaudreau@hancockassociates.com ProjectlSite Information V Project/Site Name:492 Sutton Street,Home Grown Lacrosse Project/Site Address Page 1 of a Address Line 1:492 Sutton Street Address Line 2: City:North Andover ZIP/Postal Code:01845 State:MA County or Similar Division:Middlesex Latitude/Longitude:42.713001`N,71.119753"W Latitude/Longitude Data Source:Map Horizontal Reference Datum:NAD 83 Project Start Date: 03/26/2024 Project End Date: 03/26/2025 Estimated Area to be Disturbed:2.5 Types of Construction Sites: Commercial Will there be demolition of any structure built or renovated before January 1,1980?No Will you be discharging dewatering water from your site?Yes Was the pre-development land use used for agriculture?No Are there other operators that are covered under this permit for the same project site?No Have earth-disturbing activities commenced on your projectisite?No Is your project/site located on federally recognized Indian Country lands?No Is your project/site located on a property of religious or cultural significance to an Indian tribe?No Discharge Information v Does your project/site discharge stormwater into a Municipal Separate Storm Sewer System(MS4)?Yes Are there any waters of the U.S.within 50 feet of your project's earth disturbances?No Are any of the waters of the U.S.to which you discharge designated by the state or tribal authority under its antidegradation policy as a Tier 2(or Tier 2.5)water(water quality exceeds levels necessary to support propagation of fish,shellfish,and wildlife and recreation in and on the water)or as a Tier 3 water(Outstanding National Resource Water)?See Resources,Tools and Templates (https://www.epa.gov/n pdes/construction-genera I-permit-resources-tools-and-tem ptates) No ID:001 Name:Lake Cochichewick Description:Lake Cochichewick Wetland System Latitude/Longitude:42.711963°N,71.117629`W Tier Designation: Tier 2.5 Is this receiving water impaired(on the CWA 303(d)list)?Yes Impaired Pollutants: Mercury in fish tissue Has a TMDL been completed for this receiving waterbody? No Stormwater Pollution Prevention Plan(SWPPP) v Will all required personnel,including those conducting inspections at your site,meet the training requirements in Part 6 of this permit?Yes First Name Middle Initial Last Name:Alan Berry Title:President Phone:978-887-1188 Ext.: Email:alanjohnberry@hotmail.com Endangered Species Protection Worksheet Criterion C v Determine ESA Eligibility Criterion Are your discharges and discharge-related activities already addressed in another operator's valid certification of eligibility for your"action area'under the current 2022 CGP? No Has consultation between you,a Federal Agency,and the USFWS and/or the NMFS under section 7 of the Endangered Species Act(ESA)concluded? No Are your construction activities the subject of a permit under section 10 of the ESA by the USFWS and/or NMFS,and this authorization addresses the effects of your site's discharges and discharge- related activities on ESA-listed species and/or designated critical habitat? No Page 2 of a You must determine whether species listed as either threatened or endangered,or their critical habitats)are located in your site's action area(Le.,all areas to be affected directly or indirectly by the federal action and not merely the immediate area involved in the action,including areas beyond the footprint of the site that are likely to be affected by stormwater discharges,discharge-related activities,and authorized non-stormwater discharges). Determine your Action Area You must consider the following in determining the action area for your site,and confirm that all the following are true: Y In determining my"action area',I have considered that discharges of pollutants into downstream areas can expand the action area well beyond the footprint of my site and the discharge point(s).I have taken into account the controls I will be implementing to minimize pollutants and the receiving waterbody characteristics(e.g.,perennial,intermittent,ephemeral)in determining the extent of physical,chemical,and/or biotic effects of the discharges.I confirm that all receiving waterbodies that could receive pollutants from my site are included in my action area. True Y In determining my"action area',I have considered that discharge-related activities must also be accounted for in determining my action area.I understand that discharge-related activities are any activities that cause,contribute to,or result in stormwater and authorized non-stormwater point source discharges,and measures such as the siting,construction timing,and operation of stormwater controls to control,reduce,or prevent pollutants from being discharged.I understand that any new or modified stormwater controls that will have noise or other similar effects,and any disturbances associated with construction of controls,are part of my action area. True Determine is ESA-listed species and/or critical habitat are in your site action area. ESA-listed species and designated critical habitat are under the purview of the NMFS and the USFWS,and in many cases,you will need to acquire species and critical habitat lists from both federal agencies. National Marine Fisheries Service (NMFS) For NMFS species and designated critical habitat information,use the following webpage: • https://www.epa.gov/npdes/construction-general-permit-cgp-threatened-and-endangered-species-eligibility(https://www.epa.govfnpdes/construction-general-permit-cgp-threatened-and-endangered- species-el igi bi I ity) I have checked the webpage listed above and confirmed that: There are no NMFS-protected species and/or designated critical habitat in my action area. There are NMFS-protected species and/or designated critical habitat in my action area. U.S. Fish and Wildlife Service (USFWS) For USFWS species and critical habitat information,use the following webpage: • https://www.epa.gov/npdes/construction-general-permit-cgp-threatened-and-endangered-species-eligibility(https://www.epa.gov/npdes/construction-general-permit-cgp-threatened-and-endangered- species-el igi bi I ity) I have checked the webpage listed above and confirmed that: There are no FWS-protected species and/or designated critical habitat in my action area. There are FWS-protected species and/or designated critical habitat in my action area. For FWS species,include the full printout from your IPaC query/Official Species List. Name Uploaded Date Size 31PaC Species Listpdf(attachment/1822136) 03/11/2024 8,17 MIS You may be eligible under Criterion C.You must assess whether your discharges or discharge-related activities are likely to result in short-or long-term adverse effects to ESA-listed threatened or endangered species or designated critical habitat.In order to make a determination of your site's likelihood of short-or long-term adverse effects,you must complete the Criterion C Eligibility fields below. Discharges not likely to result in any short-or long-term adverse effects to ESA-listed species and/or designated critical habitat.True You are eligible under Criterion C. I confirm that both ESA-listed species and designated critical habitat under the jurisdiction of the USFWS and/or NMFS were considered in my evaluation.Yes Identify the USFWS information sources used(Note:state resources are not acceptable): USFWS online mapping tool. Identify the NMFS information sources used(Note:state resources are not acceptable): NMFS Section 7 online mapping tool. You must provide a list of all ESA-listed species and/or designated critical habitat that are located in your"action area'.Select one of the options below and provide the required information: Option 1:Enter ESA-listed species Option 2:Attach the species fist(s) Y Attach a printout of the species list(s)showing all ESA-listed species and/or designated critical habitat located in your"action area'using the space below:9 Page 3 of a Name Uploaded Date Size 31PaC Species Listpdf(attachment/1822163) 03/11/2024 8.17 MB What is the distance between your site and the ESA-listed species and/or designated critical habitat within the action area(in miles,state"on site'if the ESA-listed species and/or designated critical habitat is within the area to be disturbed)? 0A Provide the rationale describing specifically how adverse effects to ESA-listed species will be avoided from the discharge and discharge-related activities. The project site consists of a previously cleared, grassed area, thus providing minimal habitat for the listed species and therefore is expected to have minimal to no impact on the species habitat. All proposed drainage discharges are des igned to mimic existing drainage patterns and comply with the standards set forth in the Massachusetts Stormwater Handb ook. Attach a copy of your site map showing the upland and in-water extent of your"action area'.8 Note:A copy of this site map must also be included with your SWPPP Name Uploaded Date Size .a.Action Area Exhibit.pdf(attachmenV1822214) 03/11/2024 67.87 KB Have you provided documentation in your SWPPP supporting your eligibility under Criterion C? Yes Historic Preservation v Are you installing any stormwater controls as described in Appendix E(hffps:/twww.epa.gov/system/fites/documents/2022-01/2022-cgp-final-appendix-e-historic-properties.pdf)that require subsurface earth disturbances?(Appendix E(https://www.epa.gov/system/files/documents/2022-01/2022cgp-final-appendix-e-historic-properties.pdf),Step 1) Yes Y Have prior surveys or evaluations conducted on the site already determined historic properties do not exist,or that prior disturbances have precluded the existence of historic properties? (Appendix E(hftps://www.epa.gov/systemffiles/documents/2022-01/2022-cgp-final-appendix-e-historic-properties.pdf),Step 2): No Y Have you determined that your installation of subsurface earth-disturbing stormwater controls will have no effect on historic properties?(Appendix E (https://www.epa.gov/system/files/documents/2022-01/2022-cgp-final-appendix-e-historic-properties.pdf),Step 3) Yes Certification Information v I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted.Based on my inquiry of the person or persons who manage the system,or those persons directly responsible for gathering the information,the information submitted is,to the best of my knowledge and belief,true,accurate,and complete.I have no personal knowledge that the information submitted is other than true,accurate,and complete.I am aware that there are significant penalties for submitting false information,including the possibility of fine and imprisonment for knowing violations.Signing an electronic document on behalf of another person is subject to criminal,civil,administrative,or other lawful action. Certified By:Alan J.Berry Certifier Title:President Certifier Email:alanjohnberry@hotimail.com Certified On:03/18/2024 10:20 AM ET Page 4 of 4 NHESP Priority Habitats of Rare Species NHESP Estimated Habitats of Rare Wildlife a V � Property Tax Parcels M -- a s . z IM ..� ,NIA z 46 m x. -q*ad Hip , _ TaN a s- ' "Pig _ s a� t -14 z- IPaC U.S. Fish &Wildlife Service IPaC resource list This report is an automatically generated list of species and other resources such as critical habitat (collectively referred to as trust resources) under the U.S. Fish and Wildlife Service's (USFWS)jurisdiction that are known or expected to be on or near the project area referenced below. The list may also include trust resources that occur outside of the project area, but that could potentially be directly or indirectly affected by activities in the project area. However, determining the likelihood and extent of effects a project may have on trust resources typically requires gathering additional site-specific (e.g., vegetation/species surveys) and project-specific (e.g., magnitude and timing of proposed activities) information. Below is a summary of the project information you provided and contact information for the USFWS office(s) with jurisdiction in the defined project area. Please read the introduction to each section that follows (Endangered Species, Migratory Birds, USFWS Facilities, and NWI Wetlands) for additional information applicable to the trust resources addressed in that section. Location Essex County, Massachusetts FTsk N i uk Local office New England Ecological Services Field Office t. (603) 223-2541 JEJ (603) 223-0104 70 Commercial Street, Suite 300 Concord, NH 03301-5094 Endangered species This resource Iliist its for informational purposes only and does not constitute an anallysis of (project Ilevell iirnlpacts. The primary information used to generate this list is the known or expected range of each species. Additional areas of influence (AOI) for species are also considered. An AOI includes areas outside of the species range if the species could be indirectly affected by activities in that area (e.g., placing a dam upstream of a fish population even if that fish does not occur at the dam site, may indirectly impact the species by reducing or eliminating water flow downstream). Because species can move, and site conditions can change, the species on this list are not guaranteed to be found on or near the project area. To fully determine any potential effects to species, additional site-specific and project-specific information is often required. Section 7 of the Endangered Species Act requires Federal agencies to "request of the Secretary information whether any species which is listed or proposed to be listed may be present in the area of such proposed action" for any project that is conducted, permitted, funded, or licensed by any Federal agency. A letter from the local office and a species list which fulfills this requirement can only be obtained by requesting an official species list from either the Regulatory Review section in IPaC (see directions below) or from the local field office directly. For project evaluations that require USFWS concurrence/review, please return to the IPaC website and request an official species list by doing the following: 1 . Draw the project location and click CONTINUE. 2. Click DEFINE PROJECT. 3. Log in (if directed to do so). 4. Provide a name and description for your project. 5. Click REQUEST SPECIES LIST. Listed speciesl and their critical habitats are managed by the Ecological Services Program of the U.S. Fish and Wildlife Service (USFWS) and the fisheries division of the National Oceanic and Atmospheric Administration (NOAA Fisheries). Species and critical habitats under the sole responsibility of NOAA Fisheries are not shown on this list. Please contact NOAA Fisheries for species under their jurisdiction. 1. Species listed under the Endangered Species Act are threatened or endangered; IPaC also shows species that are candidates, or proposed, for listing. See the listing status page for more information. IPaC only shows species that are regulated by USFWS (see FAQ). 2. NOAA Fisheries, also known as the National Marine Fisheries Service (NMFS), is an office of the National Oceanic and Atmospheric Administration within the Department of Commerce. The following species are potentially affected by activities in this location: Mammals NAME STATUS Northern Long-eared Bat Myotis septentrionalis Endangered Wherever found No critical habitat has been designated for this species. https://ecos.fws.gov/ecptspecies/9045 Insects NAME STATUS Monarch Butterfly Danaus plexippus Candidate Wherever found No critical habitat has been designated for this species. https://ecos.fws.gov/ecptspecies/9743 Critical habitats Potential effects to critical habitat(s) in this location must be analyzed along with the endangered species themselves. There are no;critical habitats at this location. You are still required to determine if your project(s) may have effects on all above listed species. Bald & Golden Eagles Bald and golden eagles are protected under the Bald and Golden Eagle Protection Act' and the Migratory Bird Treaty Act2. Any person or organization who plans or conducts activities that may result in impacts to bald or golden eagles, or their habitats3, should follow appropriate regulations and consider implementing appropriate conservation measures, as described in the links below. Specifically, please review the "Supplemental Information on Migratory Birds and Eagles". Additional information can be found using the following links: • Eagle Management https://www.fws.gQv//program/eagle-management • Measures for avoiding and minimizing impacts to birds https://www.fws.gov/library/collections/avoiding-and-minimizing-incidental-take- migratory-birds • Nationwide conservation measures for birds https://www.fws.gov/sites/default/files/documents/nationwide-standard-conservation- measures.pdf • Supplemental Information for Migratory Birds and Eagles in IPaC https://www.fws.gov/media/supplemental-information-migratory-birds-and-bald-and- golden-eagles-may-occur-project-action There are likely bald eagles present in your project area. For additional information on bald eagles, refer to Bald Eagle Nesting and Sensitivity to Human Activity For guidance on when to schedule activities or implement avoidance and minimization measures to reduce impacts to migratory birds on your list, seethe PROBABILITY OF PRESENCE SUMMARY below to see when these birds are most likely to be present and breeding in your project area. NAME BREEDING SEASON Bald Eagle Haliaeetus leucocephalus Breeds Oct 15 to Aug 31 This is not a Bird of Conservation Concern (BCC) in this area, but warrants attention because of the Eagle Act or for potential susceptibilities in offshore areas from certain types of development or activities. https://ecos.fws.gov/ecp/species/1626 Probability of Presence Summary The graphs below provide our best understanding of when birds of concern are most likely to be present in your project area. This information can be used to tailor and schedule your project activities to avoid or minimize impacts to birds. Please make sure you read "Supplemental Information on Migratory Birds and Eagles", specifically the FAQ section titled "Proper Interpretation and Use of Your Migratory Bird Report" before using or attempting to interpret this report. Probability of Presence Each green bar represents the bird's relative probability of presence in the 10km grid cell(s) your project overlaps during a particular week of the year. (A year is represented as 12 4- week months.) A taller bar indicates a higher probability of species presence. The survey effort (see below) can be used to establish a level of confidence in the presence score. One can have higher confidence in the presence score if the corresponding survey effort is also high. How is the probability of presence score calculated? The calculation is done in three steps: 1. The probability of presence for each week is calculated as the number of survey events in the week where the species was detected divided by the total number of survey events for that week. For example, if in week 12 there were 20 survey events and the Spotted Towhee was found in 5 of them, the probability of presence of the Spotted Towhee in week 12 is 0.25. 2. To properly present the pattern of presence across the year, the relative probability of presence is calculated. This is the probability of presence divided by the maximum probability of presence across all weeks. For example, imagine the probability of presence in week 20 for the Spotted Towhee is 0.05, and that the probability of presence at week 12 (0.25) is the maximum of any week of the year. The relative probability of presence on week 12 is 0.25/0.25 = 1; at week 20 it is 0.05/0.25 = 0.2. 3. The relative probability of presence calculated in the previous step undergoes a statistical conversion so that all possible values fall between 0 and 10, inclusive. This is the probability of presence score. To see a bar's probability of presence score, simply hover your mouse cursor over the bar. Breeding Season ( ) Yellow bars denote a very liberal estimate of the time-frame inside which the bird breeds across its entire range. If there are no yellow bars shown for a bird, it does not breed in your project area. Survey Effort (1) Vertical black lines superimposed on probability of presence bars indicate the number of surveys performed for that species in the 10km grid cell(s) your project area overlaps. The number of surveys is expressed as a range, for example, 33 to 64 surveys. To see a bar's survey effort range, simply hover your mouse cursor over the bar. No Data (....) A week is marked as having no data if there were no survey events for that week. Survey Timeframe Surveys from only the last 10 years are used in order to ensure delivery of currently relevant information. The exception to this is areas off the Atlantic coast, where bird returns are based on all years of available data, since data in these areas is currently much more sparse. IIIII probability of presence breeding season I survey effort no data SPECIES JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Bald Eagle Illy I I I I J � � P 1,J/t dllfll U-1-111- lfllfllfllf v Non-BCC Vulnerable What does IPaC use to generate the potential presence of bald and golden eagles in my specified location? The potential for eagle presence is derived from data provided by the Avian Knowledge Network(AKN). The AKN data is based on a growing collection of survey., banding, and citizen science clatasets and is queried and filtered to return a list of those birds reported as occurring in the 1 Okm grid cell(s)which your project intersects, and that have been identified as warranting special attention because they are a BCC species in that area, an eagle (Eagle Act requirements may apply). To see a list of all birds potentially present in your project area, please visit the Rapid Avian Information Locator(RAIL)Tool. - - What does IPaC use to generate the probability of presence graphs of bald and golden eagles in my specified location? The Migratory Bird Resource List is comprised of USFWS Birds of Conservation Concern (BCC).and other species that may warrant special attention in your project location. The migratory bird list generated for your project is derived from data provided by the Avian Knowledge Network(AKN). The AKN data is based on a growing collection of survey. banding, and citizen science clatasets and is queried and filtered to return a list of those birds reported as occurring in the 1 Okm grid cell(s) which your project intersects, and that have been identified as warranting special attention because they are a BCC species in that area, an eagle (Eagle Act requirements may apply), or a species that has a particular vulnerability to offshore activities or development. Again, the Migratory Bird Resource list includes only a subset of birds that may occur in your project area. It is not representative of all birds that may occur in your project area. To get a list of all birds potentially present in your project area, please visit the Rapid Avian Information Locator(RAIL)Tool. What if I have eagles on my list? If your project has the potential to disturb or kill eagles, you may need to obtain a permit to avoid violating the Eagle Act should such impacts occur. Please contact your local Fish and Wildlife Service Field Office if you have questions. Migratory birds Certain birds are protected under the Migratory Bird Treaty Act' and the Bald and Golden Eagle Protection ACt2. Any person or organization who plans or conducts activities that may result in impacts to migratory birds, eagles, and their habitats3 should follow appropriate regulations and consider implementing appropriate conservation measures, as described in the links below. Specifically, please review the "Supplemental Information on Migratory Birds and Eagles". 1. The Migratory Birds Treaty Act of 1918. 2. The Bald and Golden Eagle Protection Act of 1940. Additional information can be found using the following links: • Eagle Management https://www.fws.gov/program/eagle-management • Measures for avoiding and minimizing impacts to birds https://www.fws.gov/library/collections/avoiding-and-minimizing-incidental-take- migratory-birds • Nationwide conservation measures for birds https://www.fws.gov/sites/default/files/ documents/nationwide-standard-conservation-measures.pdf • Supplemental information for Migratory Birds and Eagles in IPaC https://www.fws.gov/media/supplemental-information-migratory-birds-and-bald-and- golden-eagles-may-occur-project-action The birds listed below are birds of particular concern either because they occur on the USFWS Birds of Conservation Concern (BCC) list or warrant special attention in your project location. To learn more about the levels of concern for birds on your list and how this list is generated, see the FAQ below. This is not a list of every bird you may find in this location, nor a guarantee that every bird on this list will be found in your project area. To see exact locations of where birders and the general public have sighted birds in and around your project area, visit the E-bird data mapping tool (Tip: enter your location, desired date range and a species on your list). For projects that occur off the Atlantic Coast, additional maps and models detailing the relative occurrence and abundance of bird species on your list are available. Links to additional information about Atlantic Coast birds, and other important information about your migratory bird list, including how to properly interpret and use your migratory bird report, can be found below. For guidance on when to schedule activities or implement avoidance and minimization measures to reduce impacts to migratory birds on your list, see the PROBABILITY OF PRESENCE SUMMARY below to see when these birds are most likely to be present and breeding in your project area. NAME BREEDING SEASON Bald Eagle Haliaeetus leucocephalus Breeds Oct 15 to Aug 31 This is not a Bird of Conservation Concern (BCC) in this area, but warrants attention because of the Eagle Act or for potential susceptibilities in offshore areas from certain types of development or activities. https://ecos.fws.gov/ecp/species/1626 Black-billed Cuckoo Coccyzus erythropthalmus Breeds May 15 to Oct 10 This is a Bird of Conservation Concern (BCC)throughout its range in the continental USA and Alaska. https://ecos.fws.gov/ecp/species/9399 Bobolink Dolichonyx oryzivorus Breeds May 20 to Jul 31 This is a Bird of Conservation Concern (BCC)throughout its range in the continental USA and Alaska. Chimney Swift Chaetura pelagica Breeds Mar 15 to Aug 25 This is a Bird of Conservation Concern (BCC)throughout its range in the continental USA and Alaska. Lesser Yellowlegs Tringa flavipes Breeds elsewhere This is a Bird of Conservation Concern (BCC)throughout its range in the continental USA and Alaska. https://ecos.fws.gov/ecp/species/9679 Pectoral Sandpiper Calidris melanotos Breeds elsewhere This is a Bird of Conservation Concern (BCC)throughout its range in the continental USA and Alaska. Rusty Blackbird Euphagus carolinus Breeds elsewhere This is a Bird of Conservation Concern (BCC) only in particular Bird Conservation Regions (BCRs) in the continental USA Short-billed Dowitcher Limnodromus griseus Breeds elsewhere This is a Bird of Conservation Concern(BCC)throughout its range in the continental USA and Alaska. https://ecos.fws.gov/ecp/species/9480 Willet Tringa semipalmata Breeds Apr 20 to Aug 5 This is a Bird of Conservation Concern (BCC)throughout its range in the continental USA and Alaska. Wood Thrush Hylocichla mustelina Breeds May 10 to Aug 31 This is a Bird of Conservation Concern (BCC)throughout its range in the continental USA and Alaska. Probability of Presence Summary The graphs below provide our best understanding of when birds of concern are most likely to be present in your project area. This information can be used to tailor and schedule your project activities to avoid or minimize impacts to birds. Please make sure you read "Supplemental Information on Migratory Birds and Eagles", specifically the FAQ section titled "Proper Interpretation and Use of Your Migratory Bird Report" before using or attempting to interpret this report. Probability of Presence Each green bar represents the bird's relative probability of presence in the 10km grid cell(s) your project overlaps during a particular week of the year. (A year is represented as 12 4- week months.) A taller bar indicates a higher probability of species presence. The survey effort (see below) can be used to establish a level of confidence in the presence score. One can have higher confidence in the presence score if the corresponding survey effort is also high. How is the probability of presence score calculated? The calculation is done in three steps: 1. The probability of presence for each week is calculated as the number of survey events in the week where the species was detected divided by the total number of survey events for that week. For example, if in week 12 there were 20 survey events and the Spotted Towhee was found in 5 of them, the probability of presence of the Spotted Towhee in week 12 is 0.25. 2. To properly present the pattern of presence across the year, the relative probability of presence is calculated. This is the probability of presence divided by the maximum probability of presence across all weeks. For example, imagine the probability of presence in week 20 for the Spotted Towhee is 0.05, and that the,probability of presence at week 12 (0.25) is the maximum of any week of the year. The relative probability of presence on week 12 is 0.25/0.25 = 1; at week 20 it is 0.05/0.25 = 0.2 3. The relative probability of presence calculated in the previous step undergoes a statistical conversion so that all possible values fall between 0 and 10, inclusive. This is the probability of presence score. To see a bar's probability of presence score, simply hover your mouse cursor over the bar. Breeding Season (,fi,), Yellow bars denote a very liberal estimate of the time-frame inside which the bird breeds across its entire range. If there are no yellow bars shown for a bird, it does not breed in your project area. Survey Effort (1) Vertical black lines superimposed on probability of presence bars indicate the number of surveys performed for that species in the 10km grid cell(s) your project area overlaps. The number of surveys is expressed as a range, for example, 33 to 64 surveys. To see a bar's survey effort range, simply hover your mouse cursor over the bar. No Data (....) A week is marked as having no data if there were no survey events for that week. Survey Timeframe Surveys from only the last 10 years are used in order to ensure delivery of currently relevant information. The exception to this is areas off the Atlantic coast, where bird returns are based on all years of available data, since data in these areas is currently much more sparse. IIIII probability of presence breeding season I survey effort no data SPECIES JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Bald Eagle Non-BCC 111���IIIIIIIylll�f IlllIll l� Illl IlllIlllIllIlll IIIIIII I Ill, �iiIl1 I Ill, I I Illy I I I I Illl Ill�fllll I Illl �r 1-IIICIIIf III��IIIIII Illl I Illl I I Ill Illylllylll�f Vulnerable Black-billed Cuckoo BCC Rangewide (CON) Bobolink BCC Rangewide I I I I I I I III�III� I IlllrlllCrlllCrlll�r Illlrllllrllllr (CON) Chimney Swifta......1.. 1.. ..1,....1..IJ�%, '%' BCC Rangewide �1�111,111 �11�i,, �l (CON) Lesser Yellowlegs BCC Rangewide (CON) PectoralI L..,�,, L. ,,.,.1...1 ..L. L. L .L.. .I ..L..1..1- ( �� l-1/III 4,J1 D, .L.. Sandpiper BCC Rangewide (CON) Rusty Blackbird L L. L 1 irlL 1 II 1111 4o BCC- BCR Short-billed ,L..,,L.. .11 L... 1 I �15 t l � I-�w } �AL 1 -t - Dowitcher BCC Rangewide (CON) Willet BCC Rangewide .e�. I I m et. t-11 e.� L. e�. m tJ- ]" { �� (CON) Wood Thrush l .1 L, .�. 1 .1 .1 l. .l 1. .1 L, L 1 III%111 ll 11� ,..I ll� j ,.a,.. 11 111 l hill Illl 1-4 L.J L..L .1. F.. .1..�. L...L. BCC Rangewide (CON) Tell me more about conservation measures I can implement to avoid or minimize impacts to migratory birds. Nationwide Conservation Measures describes measures that can help avoid and minimize impacts to all birds at any location year round. Implementation of these measures is particularly important when birds are most likely to occur in the project area. When birds may be breeding in the area, identifying the locations of any active nests and avoiding their destruction is a very helpful impact minimization measure. To see when birds are most likely to occur and be breeding in your project area,view the Probability of Presence Summary. Additional measures or permits may be advisable depending on the type of activity you are conducting and the type of infrastructure or bird species present on your project site. What does IPaC use to generate the list of migratory birds that potentially occur in my specified location? The Migratory Bird Resource List is comprised of USFWS Birds of Conservation Concern (BCC),and other species that may warrant special attention in your project location. The migratory bird list generated for your project is derived from data provided by the Avian Knowledge Network(AKN). The AKN data is based on a growing collection of survey, banding, and citizen science datasets and is queried and filtered to return a list of those birds reported as occurring in the 10km grid cell(s)which your project intersects, and that have been identified as warranting special attention because they are a BCC species in that area, an eagle (Eagle Act requirements may apply), or a species that has a particular vulnerability to offshore activities or development. Again, the Migratory Bird Resource list includes only a subset of birds that may occur in your project area. It is not representative of all birds that may occur in your project area. To get a list of all birds potentially present in your project area, please visit the Rapid Avian Information Locator(RAIL)Tool. What does IPaC use to generate the probability of presence graphs for the migratory birds potentially occurring in my specified location? The probability of presence graphs associated with your migratory bird list are based on data provided by the Avian Knowledge Network(AKN),. This data is derived from a growing collection of survey., banding, and citizen science datasets. Probability of presence data is continuously being updated as new and better information becomes available. To learn more about how the probability of presence graphs are produced and how to interpret them, go the Probability of Presence Summary and then click on the "Tell me about these graphs" link. How do I know if a bird is breeding, wintering or migrating in my area? To see what part of a particular bird's range your project area falls within (i.e. breeding, wintering, migrating or year-round), you may query your location using the RAIL Tool and look at the range maps provided for birds in your area at the bottom of the profiles provided for each bird in your results. If a bird on your migratory bird species list has a breeding season associated with it, if that bird does occur in your project area, there may be nests present at some point within the timeframe specified. If"Breeds elsewhere" is indicated, then the bird likely does not breed in your project area. What are the levels of concern for migratory birds? Migratory birds delivered through IPaC fall into the following distinct categories of concern: 1. "BCC Rangewide" birds are Birds of Conservation Concern (BCC)that are of concern throughout their range anywhere within the USA(including Hawaii, the Pacific Islands, Puerto Rico, and the Virgin Islands); 2. "BCC- BCR" birds are BCCs that are of concern only in particular Bird Conservation Regions (BCRs) in the continental USA; and 3. "Non-BCC-Vulnerable" birds are not BCC species in your project area, but appear on your list either because of the Eagle Act requirements (for eagles) or(for non-eagles) potential susceptibilities in offshore areas from certain types of development or activities (e.g. offshore energy development or longline fishing). Although it is important to try to avoid and minimize impacts to all birds, efforts should be made, in particular, to avoid and minimize impacts to the birds on this list, especially eagles and BCC species of rangewide concern. For more information on conservation measures you can implement to help avoid and minimize migratory bird impacts and requirements for eagles, please see the FAQs for these topics. Details about birds that are potentially affected by offshore projects For additional details about the relative occurrence and abundance of both individual bird species and groups of bird species within your project area off the Atlantic Coast, please visit the Northeast Ocean Data Portal. The Portal also offers data and information about other taxa besides birds that may be helpful to you in your project review. Alternately, you may download the bird model results files underlying the portal maps through the NOAA NCCOS Integrative Statistical Modeling and Predictive Mapping of Marine Bird Distributions and Abundance on the Atlantic Outer Continental Shelf project webpage. Bird tracking data can also provide additional details about occurrence and habitat use throughout the year, including migration. Models relying on survey data may not include this information. For additional information on marine bird tracking data, see the Diving Bird Study_and the nanotag studies or contact Caleb Spiegel or Pam Loring. What if I have eagles on my list? If your project has the potential to disturb or kill eagles, you may need to obtain a permit to avoid violating the Eagle Act should such impacts occur. Proper Interpretation and Use of Your Migratory Bird Report The migratory bird list generated is not a list of all birds in your project area, only a subset of birds of priority concern.To learn more about how your list is generated, and see options for identifying what other birds may be in your project area, please see the FAQ "What does IPaC use to generate the migratory birds potentially occurring in my specified location". Please be aware this report provides the "probability of presence" of birds within the 10 km grid cell(s)that overlap your project; not your exact project footprint. On the graphs provided, please also look carefully at the survey effort(indicated by the black vertical bar) and for the existence of the "no data" indicator(a red horizontal bar). A high survey effort is the key component. If the survey effort is high, then the probability of presence score can be viewed as more dependable. In contrast, a low survey effort bar or no data bar means a lack of data and, therefore, a lack of certainty about presence of the species.This list is not perfect; it is simply a starting point for identifying what birds of concern have the potential to be in your project area, when they might be there, and if they might be breeding(which means nests might be present). The list helps you know what to look for to confirm presence, and helps guide you in knowing when to implement conservation measures to avoid or minimize potential impacts from your project activities, should presence be confirmed. To learn more about conservation measures,visit the FAQ "Tell me about conservation measures I can implement to avoid or minimize impacts to migratory birds" at the bottom of your migratory bird trust resources page. Facilities National Wildlife Refuge lands Any activity proposed on lands managed by the National Wildlife Refuge system must undergo a 'Compatibility Determination' conducted by the Refuge. Please contact the individual Refuges to discuss any questions or concerns. There are no refuge lands at this location. Fish hatcheries There are no fish hatcheries at this location. Wetlands in the National Wetlands Inventory (NWI ) Impacts to NWI wetlands and other aquatic habitats may be subject to regulation under Section 404 of the Clean Water Act, or other State/Federal statutes. For more information please contact the Regulatory Program of the local U.S. Army Carps of Engineers District. This location did not intersect any wetlands mapped by NWI. NOTE: This initial screening does not replace an on-site delineation to determine whether wetlands occur. Additional information on the NWI data is provided below. Data limitations The Service's objective of mapping wetlands and deepwater habitats is to produce reconnaissance level information on the location, type and size of these resources. The maps are prepared from the analysis of high altitude imagery. Wetlands are identified based on vegetation, visible hydrology and geography. A margin of error is inherent in the use of imagery; thus, detailed on-the-ground inspection of any particular site may result in revision of the wetland boundaries or classification established through image analysis. The accuracy of image interpretation depends on the quality of the imagery, the experience of the image analysts, the amount and quality of the collateral data and the amount of ground truth verification work conducted. Metadata should be consulted to determine the date of the source imagery used and any mapping problems. Wetlands or other mapped features may have changed since the date of the imagery or field work. There may be occasional differences in polygon boundaries or classifications between the information depicted on the map and the actual conditions on site. Data exclusions Certain wetland habitats are excluded from the National mapping program because of the limitations of aerial imagery as the primary data source used to detect wetlands. These habitats include seagrasses or submerged aquatic vegetation that are found in the intertidal and subtidal zones of estuaries and nearshore coastal waters. Some deepwater reef communities (coral or tuberficid worm reefs) have also been excluded from the inventory. These habitats, because of their depth, go undetected by aerial imagery. Data precautions Federal, state, and local regulatory agencies with jurisdiction over wetlands may define and describe wetlands in a different manner than that used in this inventory. There is no attempt, in either the design or products of this inventory, to define the limits of proprietary jurisdiction of any Federal, state, or local government or to establish the geographical scope of the regulatory programs of government agencies. Persons intending to engage in activities involving modifications within or adjacent to wetland areas should seek the advice of appropriate Federal, state, or local agencies concerning specified agency regulatory programs and proprietary jurisdictions that may affect such activities. Drawn Action Area & Overlapping S7 Consultation Areas Area of Interest (AOI) Information Area : 611.15 acres Mar 11 2024 10:15:22 Eastern Daylight Time I' Sturgoon Summary Name Count Area(acres) Length(mi) Atlantic Sturgeon 0 0 N/A Shortnose Sturgeon 0 0 N/A Atlantic Salmon 0 0 N/A Sea Turtles 0 0 N/A Atlantic Large Whales 0 0 N/A In or Near Critical Habitat 0 0 N/A MACRIS Maps [im, ,aiclh[D ch Zoom to a town no BOB RICIE------------------------ dYlnq Oub Carr arY circa lay �iinirq Aims, m17 Sd NAD F HANCOCK ASSOCIATES "!W111-Voyovs ScieintWs, Stormwater Management Report #492 SUTTON STREET North Andover, MA Prepared For: Home Grown Lacrosse, LLC 400 Osgood Street North Andover, MA 01845 Prepared By: Brian Geaudreau, PE Morgan Seale Project: 27016 Date: August 30, 2023 Revised: November 27, 2023 34 Chelmsford Street, 2nd Floor I Chelmsford, MA 01824 V 978-244-0110 F:978-244-1133 HancockAssociates.com !31'Hl I �3:,0S, 0�\J, 0 H!!!�l )M\JVE��?S, MX�?� [3( lROUG 1, I I IIAA I SM E]V, ",,fll Table of Contents BACKGROUND INFORMATION A.) Project Description B.) Existing Conditions C.) Proposed Conditions-Stormwater Management Narrative DOCUMENTING COMPLIANCE A.) MassDEP Stormwater Standards 1. No Untreated Discharges or Erosion to Wetlands 2. Peak Rate Attenuation i. Runoff Summary Table 3. Stormwater Recharge i. Soil Evaluation ii. Required Recharge Volume iii. Sizing • 'Static"Method • `Simple Dynamic"Method • "Dynamic Field"Method iv. 72-hour Drawdown Analysis v. Capture Area Adjustment vi. Mounding Analysis 4. Water Quality i. TSS Removal Train • Weighted Average Calculation ii. Water Quality Volume Calculation 5. Land Uses With Higher Potential Pollutant Loads (LUHPPLs) 6. Critical Areas 7. Redevelopments and Other Projects Subject to the Standards only to the Maximum Extent Practicable 8. Construction Period Pollution Prevention and Erosion &Sedimentation Controls i. Erosion and Sediment Control Plan 9. Operation and Maintenance Plan i. Owner Certification Statement ii. BMP Inspection Logs 10. Prohibition of Illicit Discharges i. Illicit Discharge Statement SOILS INFORMATION A.) USDA NRCS Web Soil Survey Information ATTACHMENTS • Pre-development Subcatchment Plan • Post-development Subcatchment Plan • HydroCAD Worksheets • USGS Topographic Map • NHESP Endangered Species and Critical Habitat Map • FEMA Firmette Map Background Information A. Project Description This project intends to construct a 39,100±SF athletic facility with office space, accompanying parking lot and utilities on a leased lot granted by the Lawrence Municipal Airport. Said lease area is proposed to be 2.5±Acres. The proposed building will be provided with gas and water service from the existing underground services along the airport entrance road (Terminal Road). Sewer service will be provided by connecting to an existing sewer manhole approximately 900 feet north of the intersection of Terminal Road and Sutton Street. In order to mitigate any increase in stormwater runoff from the proposed development, stormwater management practices have been designed to mirror existing drainage patterns and provide full compliance with MassDEP Stormwater Management Standards. Best Management Practices (BMPs) include a porous pavement system sized to meet all performance requirements. B. Existing Site Conditions The subject lot is located along the eastern side of Terminal Road. Existing conditions include maintained grass fields, disturbed earth from removal of soil stockpiling, and a small portion of woods.The site is located in the Industrial 2 district with a portion being within the Watershed Protection District. Stormwater runoff from the site is divided between two discharge areas,the southern end of Terminal Road, Sutton Street and Old Clark Road, and the northern end of Terminal Road.The drainage directed to the northern end of Terminal Road is collected via the Lawrence Municipal Airport's drainage system. Drainage directed to the southern side of Terminal Road and Old Clark Road is collected via the Town's municipal drainage system where is discharged at various points along Osgood Street into the wetlands surrounding Lake Cochichewick(GIS Drainage information shown below). I fia i�w �IG� 0 Figure 1.0 An on the ground survey was performed by Hancock Associates through the Summer of 2023.The site is partially located within the Watershed Protection District: General Zone and Watershed Protection District: Non- Discharge Zone. Onsite soils are mapped as Hydrologic Group C by USDA NRCS Web Soil Survey. C. Proposed Conditions—Stormwater Management and Methodology The Stormwater Management design methodology implemented for this project is intended to treat and exfiltrate runoff via a porous pavement system.This hydrologic analysis methodology will approximate pre- development peak flow rates at design points:The Northern portion of Terminal Road and the Sutton Street/Old Clark Road Drainage System.The project proposes to disturb approximately 88,000 SF±of land with 59,515 SF of that being new impervious surfaces including, porous pavement, driveways and walks, and roofs. Terminal Road-North(1S/9S) In existing site conditions runoff from the northern portion of the lot drains to the north into the existing drainage system of Terminal Road. In the post-development condition the contributory area will be decreased, thus allowing for less runoff as the majority of the stormwater will be directed to the porous pavement. Sutton Street/Old Clark Road MAIM In existing site conditions runoff from the majority of the lot drains overland to the southeast into the Old Clark Road and Sutton Street drainage systems (see Figure 1.0). Post-development conditions will maintain the overall drainage patterns with additional runoff from impervious surfaces being treated and attenuated by the proposed porous pavement parking lot thus leading to a decrease in total volume directed the municipal system (see Runoff Summary Table and the attached HydroCAD worksheets for further detail). Documenting Compliance A. MassDEP Stormwater Management Standards The following sections provide a discussion of how the requirements of the Stormwater Management Standards are addressed by the proposed new development. Standard 1: No Untreated Discharges or Erosion to Wetlands No new stormwater conveyances(e.g. outfalls) may discharge untreated stormwater directly to or cause erosion in wetlands or waters of the Commonwealth. No new untreated conveyances or direct discharge to wetlands are proposed; all points of discharge mirror existing discharge patterns. See computations completed in Standards 4& 6 that demonstrate proper treatment of suspended solids and required water quality volume. Standard 2: Peak Rate Attenuation Stormwater Management Systems must be designed so that post-development peak discharge rates do not exceed pre-development discharge rates. Runoff Summary Table: Rainfall Frequency 2-year 10-year 25-year 100-year 24-hour Rainfall Intensity 3.15 in 4.99 in 6.14 in 7.91 in Pre-Development Overland to Terminal Rd. North 0.71 cfs 1.81 cfs 2.57 cfs 3.80 cfs 16,574 cf (1S) Post-Development Overland to Terminal Rd. North 0.70 cfs 1.71 cfs 2.41 cfs 3.53 cfs 10,254 cf (9S) Delta -0.01 cfs -0.10 cfs -0.16 cfs -0.27 cfs -6323 cf Percentage Difference(%) -1.4% -5.5% -6.2% -7.1% -38.2% Pre-Development Overland to Old Clark Rd. & 1.30 cfs 3.32 cfs 4.72 cfs 6.98 cfs 32,793cf Sutton St. (2S) Post-Development Overland to Old Clark Rd. & 1.09 cfs 2.78 cfs 3.95 cfs 6.79 cfs 24,846 cf Sutton St. (16R) Delta -0.21 cfs -0.54 cfs -0.77 cfs -0.19 cfs -7,947 cf Percentage Difference(%) -16.2% -16.3% -16.3% -2.7% -24.2% As detailed in the Stormwater Methodology and Introduction and summarized in the preceding table,there will be no increase in peak runoff rate for the 2, 10, or 100-year frequency events as compared to existing conditions. HydroCAD worksheets are attached herewith. Standard 3: Stormwater Recharge Loss of annual recharge to groundwater shall be eliminated or minimized through the use of infiltration measures including environmentally sensitive site design, low impact development techniques,stormwater best management practices,and good operation and maintenance. At a minimum,the annual recharge from the post-development site should approximate the annual recharge from the pre-development conditions based on soil type. This standard is met when the stormwater management system is designed to infiltrate the required recharge volume as determined in accordance with the Massachusetts Stormwater Handbook. Required Recharge Volume The Required Recharge Volume equals a depth of runoff corresponding to the soil type times the impervious areas covering that soil type at the post-development site. Rv =Fx impervious area Equation (1) Rv =Required Recharge Volume, expressed in Ft3, cubic yards, or acre-feet F = Target Depth Factor Impervious Area =pavement and rooftop area on site Target Depth Factor(F) =0.2S inch (Class C Hydrologic Soils) Rv= (0.25 inch x 1 ft/ 12 IN) (58,340 SF) = 1,215 CF Total Recharge Required = 1,215 CF 1 inch retention volume (required to achieve 90%TSS removal-see Standard 4): (1 inch x 1 ft/12 IN) (58,340 SF) =4,861 CF Required retention Volume=4,861 CF Recharge Facility Volume Porous Pavement Reservoir 5,444 CF( >4,861 CF) (stage-area-storage table provided on next page) Drawdown within 72 Hours Rv Timedrawdown (K)(Bottom Area) Rv=Storage Volume K =Saturated Hydraulic Conductivity For "Static"and"Simple Dynamic"Methods, use Rawls Rate (see Table 2.3.3). For "Dynamic Field"Method, use 50%of the in-situ saturated hydraulic conductivity. Bottom Area=Bottom Area of Recharge Structure Proposed Porous Pavement Time=5,444 CF/ [(1.02 inches/hour) (1ft/ 12inches) (21,950 SF)] Time= 2.9 hours (<72 hours) 27016hyd-RI Type11124-hr 100-year Rainfall=7.91" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 13P:Porous Pavement expanded resvr Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 158.90 21,950 0 159.49 21,950 5,180 158.91 21,950 88 159.50 21,950 5,268 158.92 21,950 176 159.51 21,950 5,356 158.93 21,950 263 159.52 21,950 5,444 158.94 21,950 351 159.53 21,950 5,531 158.95 21,950 439 159.54 21,950 5,619 158.96 21,950 527 159.55 21,950 5,707 158.97 21,950 615 159.56 21,950 5,795 158.98 21,950 702 159.57 21,950 5,883 158.99 21,950 790 159.58 21,950 5,970 159.00 21,950 878 159.59 21,950 6,058 159.01 21,950 966 159.60 21,950 6,146 159.02 21,950 1,054 159.61 21,950 6,234 159.03 21,950 1,141 159.62 21,950 6,322 159.04 21,950 1,229 159.63 21,950 6,409 159.05 21,950 1,317 159.64 21,950 6,497 159.06 21,950 1,405 159.65 21,950 6,585 159.07 21,950 1,493 159.66 21,950 6,673 159.08 21,950 1,580 159.67 21,950 6,761 159.09 21,950 1,668 159.68 21,950 6,848 159.10 21,950 1,756 159.69 21,950 6,936 159.11 21,950 1,844 159.70 21,950 7,024 159.12 21,950 1,932 159.71 21,950 7,112 159.13 21,950 2,019 159.72 21,950 7,200 159.14 21,950 2,107 159.73 21,950 7,287 159.15 21,950 2,195 159.74 21,950 7,375 159.16 21,950 2,283 159.75 21,950 7,463 159.17 21,950 2,371 159.76 21,950 7,551 159.18 21,950 2,458 159.77 21,950 7,639 159.19 21,950 2,546 159.78 21,950 7,726 159.20 21,950 2,634 159.79 21,950 7,814 159.21 21,950 2,722 159.80 21,950 7,902 159.22 21,950 2,810 159.81 21,950 7,990 159.23 21,950 2,897 159.82 21,950 8,078 159.24 21,950 2,985 159.83 21,950 8,078 159.25 21,950 3,073 159.84 21,950 8,078 159.26 21,950 3,161 159.85 21,950 8,078 159.27 21,950 3,249 159.86 21,950 8,078 159.28 21,950 3,336 159.87 21,950 8,078 159.29 21,950 3,424 159.88 21,950 8,078 159.30 21,950 3,512 159.89 21,950 8,078 159.31 21,950 3,600 159.90 21,950 8,078 159.32 21,950 3,688 159.91 21,950 8,078 159.33 21,950 3,775 159.92 21,950 8,078 159.34 21,950 3,863 159.93 21,950 8,078 159.35 21,950 3,951 159.36 21,950 4,039 159.37 21,950 4,127 159.38 21,950 4,214 159.39 21,950 4,302 159.40 21,950 4,390 159.41 21,950 4,478 159.42 21,950 4,566 159.43 21,950 4,653 159.44 21,950 4,741 159.45 21,950 4,829 159.46 21,950 4,917 159.47 21,950 5,005 159.48 21,950 5,092 Mounding Analysis Porous Pavement Length = 145' Width = 151.4' Application Rate: S,444 cf/day/219SO sf =0.248 cf/day/sf Fillable Porosity(Specific Yield): Soil Desc: LS Yield Values: 0.23 Saturated Hydraulic Conductivity(Ksat) =3ft/day for fine sands The mounding analysis shown on the following page demonstrates the impact of the porous pavement infiltration on the estimated groundwater table. During a 100-year storm event the amount of water infiltrated by the reservoir course of the pavement causes the groundwater table to rise 1.08 feet above its normal level thus having no effect on the practice. Groundwater Mounding Analysis (Hantush's Method using Glover's Solution) 1.2 1.0 0.8 L 0.6 LM 0.4 0.2 0.0 -/ 0 1 2 3 4 5 Time(day) UIIIIIIIU1QlUlUlUlD1➢1lYIYIN/Y/C/GC/4%////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////� gM91➢IYIYIN/Y/C/GC/4%/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////OAf MODEL RESULTS COMPANY: Hancock Associates Mound PROJECT: 27016-HGR Lacrosse Time Height (day) (ft) ANALYST: Morgan Seale 0 0 DATE: 11/6/2023 TIME: 1:09:25 PM 0 0.01 0 0.05 INPUT PARAMETERS 0.1 0.1 0.2 0.17 Application rate: 0.2484 c.ft/day/sq. ft 0.2 0.24 Duration of application: 1 day 0.3 0.32 Total simulation time: 5 day 0.4 0.43 Fillable porosity: 0.23 0.5 0.56 Hydraulic conductivity: 3 ft/day 0.7 0.75 Initial saturated thickness: 30 ft 1 1.08 Length of application area: 145 ft 1.1 1.08 Width of application area: 151.4 ft 1.2 1.07 No constant head boundary used 1.4 1.06 Groundwater mounding @ 1.6 1.05 X coordinate: 0 ft 1.9 1.02 Y coordinate: 0 ft 2.2 0.99 Total volume applied: 5453.125 cft 2.6 0.94 3.1 0.88 3.8 0.79 5 0.67 Standard 4: Water Quality Stormwater management systems shall be designed to remove 80%of the average annual post-construction load of Total Suspended Solids(TSS). This standard is met when: (a) Suitable practices for source control and pollution prevention are identified in a long-term pollution prevention plan, and thereafter are implemented and maintained; (b)Structural stormwater best management practices are sized to capture the required water quality volume determined in accordance with the Massachusetts Stormwater Handbook; and (c) Pretreatment is provided in accordance with the Massachusetts Stormwater Handbook. The required water quality volume equals 1.0 inch of runoff times the total impervious area of the post- development project site for a discharge • from a land use with a higher potential pollutant load; • within an area with a rapid infiltration rate (greater than 2.4 inches per hour); • within a Zone II or Interim Wellhead Protection Area; • near or to the following critical areas: o Outstanding Resource Waters, o Special Resource Waters, o bathing beaches, o shellfish growing areas, o cold-water fisheries. i.TSS Removal for Porous Pavement: TSS Removal Efficiency=90% if storage bed sized to retain 1"water quality volume drained within 72 hours. -MA MS4 General Permit section:2.3.6a.ii.3.0.2 TSS Removal Percentage Computations: BMP TSS REMOVAL RATE STARTING TSS AMOUNT REMAINING LOAD LOAD REMOVED Porous Pavement 90% 100% 90% 10% Total Phosphorus(TP) removal: TP Removal Efficiency=62%with 12"filter course -(Table 3-22 of Appendix F,Attachment 3, MA MS4 General Permit) Standard 5: Land Uses with Higher Potential Pollutant Loads For land uses with higher potential pollutant loads,source control and pollution prevention shall be implemented in accordance with the Massachusetts Stormwater Handbook to eliminate or reduce the discharge of stormwater runoff from such land uses to the maximum extent practicable. If through source control and/or pollution prevention all land uses with higher potential pollutant loads cannot be completely protected from exposure to rain,snow,snow melt,and stormwater runoff,the proponent shall use the specific structural stormwater BMPs determined by the Department to be suitable for such uses as provided in the Massachusetts Stormwater Handbook. Stormwater discharges from land uses with higher potential pollutant loads shall also comply with the requirements of the Massachusetts Clean Waters Act, M.G.L. c. 21, A§A§26-53 and the regulations promulgated thereunder at 314 CMR 3.00, 314 CMR 4.00 and 314 CMR 5.00. The proposed development does not qualify as a Land Use with Higher Potential Loads (LUHPPLs). Standard 6: Critical Areas Stormwater discharges within the Zone II or Interim Wellhead Protection Area of a public water supply, and stormwater discharges near or to any other critical area, require the use of the specific source control and pollution prevention measures and the specific structural stormwater best management practices determined by the Department to be suitable for managing discharges to such areas, as provided in the Massachusetts Stormwater Handbook.A discharge is near a critical area if there is a strong likelihood of a significant impact occurring to said area,taking into account site-specific factors. Stormwater discharges to Outstanding Resource Waters and Special Resource Waters shall be removed and set back from the receiving water or wetland and receive the highest and best practical method of treatment. A"storm water discharge"as defined in 314 CMR 3.04(2)(a)1 or(b)to an Outstanding Resource Water or Special Resource Water shall comply with 314 CMR 3.00 and 314 CMR 4.00. Stormwater discharges to a Zone I or Zone A are prohibited unless essential to the operation of a public water supply. This project does not discharge to critical areas. The proposed development meets this standard. Standard 7: Redevelopments Subject to the Standards only to the Maximum Extent Practicable A redevelopment project is required to meet the following Stormwater Management Standards only to the maximum extent practicable: Standard 2,Standard 3,and the pretreatment and structural best management practice requirements of Standards 4, 5,and 6. Existing stormwater discharges shall comply with Standard 1 only to the maximum extent practicable. A redevelopment project shall also comply with all other requirements of the Stormwater Management Standards and improve existing conditions. The proposed project is not a redevelopment and shall comply with all other requirements of the Stormwater Management Standards to the maximum extent practicable. Standard 8: Construction Period Pollution Prevention and Erosion & Sedimentation Controls A plan to control construction-related impacts including erosion, sedimentation and other pollutant sources during construction and land disturbance activities(construction period erosion,sedimentation, and pollution prevention plan) shall be developed and implemented. EROSION AND SEDIMENTATION CONTROL PLAN Best management practices(BMP)for erosion and sedimentation control are staked silt fence, hydro seeding,and phased development. Many stormwater BMP technologies (e.g., infiltration technologies) are not designed to handle the high concentrations of sediments typically found in construction runoff and must be protected from construction-related sediment loadings. Construction BMP's must be maintained. In developing the proposed project certain measures will be implemented to minimize impacts erosion and sedimentation could have on surrounding areas. This section addresses items that involve proper construction techniques, close surveillance of workmanship, and immediate response to emergency situations.The developer must be prepared to provide whatever reasonable measures are necessary to protect the environment during construction and to stabilize all disturbed areas as soon as construction ends. Pre-Construction 1. Prior to clearing,excavation,construction,or any land disturbing activity requiring a permit,the applicant, the applicant's technical representative,the general contractor, pertinent subcontractors,and any person with authority to make changes to the project,shall meet with the Town's designated Agent and to review the permitted plans and proposed implementation. 2. The contractor shall have a stockpile of materials required to control erosion on-site to be used to supplement or repair erosion control devices. These materials shall include, but are not limited to straw wattles, catch basin filter bags and crushed stone. 3. The contractor is responsible for erosion control on site and shall utilize erosion control measures where needed, regardless of whether the measures are specified on the plan or in the decisions. Preliminary Site Work 1. Materials such as gravel to be removed should be stockpiled, separating the topsoil for future use on the site. Erosion control shall be utilized along the down slope side of the piles if the piles are to remain for more than three weeks. 2. If intense rainfall is anticipated, the installation of supplemental straw bale dikes, silt fences, or armored dikes shall be considered. Site Inspections During Construction 1. During construction,the permittee or his/her Agent shall conduct and document inspections of all control measures no less than weekly or as specified in the permit, and prior to and following anticipated storm events.The purpose of such inspections will be to determine the overall effectiveness of the Erosion and Sedimentation Control Plan, and the need for maintenance or additional control measures. Porous Pavement Installation 1. Porous pavement shall be installed only after construction proposed structures and grading has been completed in order to ensure proper underlying infiltration soil interfacing and protection of porous system from damage during construction. 2. Pavement shall be vacuum swept and cleared of all remaining construction debris and/or loose materials following construction and site stabilization. Landscaping/Seeding 1. Landscaping/Seeding shall occur as soon as possible to provide permanent stabilization of disturbed surfaces. 2. If the season or adverse weather conditions do not allow the establishment of vegetation, temporary mulching with straw, wood chips weighted with snow fence or branches, or other methods shall be provided. 3. A minimum of 4 inches of topsoil shall be placed and its surface smoothed to the specified grades. 4. The use of herbicides is strongly discouraged. 5. Hydro seeding is encouraged for steep slopes. Application rates on slopes greater than 3:1 shall have a minimum seeding rate of 5-Ibs/1000 SF. A latex or fiber tackifier shall be used on these slopes at a minimum rate of 50 lbs. of tackifier per 500 gallons of water used. Standard 9: Operation and Maintenance Plan A long-term operation and maintenance plan shall be developed and implemented to ensure that stormwater management systems function as designed. Operation and Maintenance plan has been developed and submitted as a standalone document. Standard 10: Illicit Discharges to Drainage System All illicit discharges to the stormwater management system are prohibited. Measures to prevent illicit discharges are included in Standard 4 &8 of this report. It is the responsibility of the owner post construction to uphold this standard. A no illicit discharges statement has not been attached but will be submitted by the owner prior to discharge of stormwater to post construction BM Ps. Illicit Discharge Compliance Statement To the best of my knowledge no illicit discharges currently exist on the site and no future illicit discharge will be allowed, including wastewater discharges and discharges of stormwoter contaminated by contact with process wastes, raw materials, toxic pollutants, hazardous substances, oil, or grease. Signed by Owner Date Soil Information USDA NRCS WEB SOIL SURVEY INFORMATION Soil Map—Essex County,Massachusetts, Northern Part 325900 326100 326300 326500 326700 326900 327100 42°43 25"N 42°43 25"N NO f n _ a a f i QQ �1 r � 1 0 l� v i 42°42'20"N 42°42'20"N 325700 325900 326100 3263M 32MM 326700 326900 327100 - h Map Scale:1:9,750 if printed on A portrait(8.5"x 11")sheet Meters N 0 100 200 400 600 A Feet 0 450 900 1800 2700 Map projection:Web Mercator Comer coordinates:WGS84 Edge tics:UTM Zone 19N WGS84 tJSl)A Natural Resources Web Soil Survey 6/27/2023 Conservation Service National Cooperative Soil Survey Page 1 of 3 Soil Map—Essex County,Massachusetts, Northern Part MAP LEGEND MAP INFORMATION Area of Interest(AOq Spoil Area The soil surveys that comprise your AOI were mapped at Area of Interest(AOI) 1:15,800. Stony Spot Soils Please rely on the bar scale on each map sheet for map Very Stony Spot Soil Map Unit Polygons measurements. Wet Spot Source of Map: Natural Resources Conservation Service Soil Map Unit Lines F Other Web Soil Survey URL: Soil Map Unit Points Coordinate System: Web Mercator(EPSG:3857) Special Line Features Special Point Features Maps from the Web Soil Survey are based on the Web Mercator o- Blowout water Features projection,which preserves direction and shape but distorts Streams and Canals distance and area.A projection that preserves area,such as the Borrow Pit Albers equal-area conic projection,should be used if more Clay Spot Transportation accurate calculations of distance or area are required. Rails Closed Depression This product is generated from the USDA-NRCS certified data as _ Interstate Highways of the version date(s)listed below. Gravel Pit US Routes Soil Survey Area: Essex County, Massachusetts, Northern Part Gravelly Spot Major Roads Survey Area Data: Version 18,Sep 9,2022 C. Landfill Local Roads Soil map units are labeled(as space allows)for map scales Lava Flow 1:50,000 or larger. L Background Marsh or swamp Aerial Photography Date(s)aerial images were photographed: May 22,2022—Jun 5,2022 M Mine or Quarry The orthophoto or other base map on which the soil lines were Miscellaneous Water compiled and digitized probably differs from the background imagery displayed on these maps.As a result,some minor Perennial water shifting of map unit boundaries may be evident. Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip 0o Sodic Spot USDA Natural Resources Web Soil Survey 6/27/2023 Conservation Service National Cooperative Soil Survey Page 2 of 3 Soil Map-Essex County, Massachusetts, Northern Part Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 1 Water 15.0 2.9% 6A Scarboro mucky fine sandy 7.5 1.5% loam,0 to 3 percent slopes 31A Walpole sandy loam,0 to 3 6.6 1.3% percent slopes 52A Freetown muck,0 to 1 percent 4.8 0.9% slopes 70A Ridgebury fine sandy loam,0 8.6 1.7% to 3 percent slopes 260A Sudbury fine sandy loam,0 to 4.3 0.8% 3 percent slopes 305B Paxton fine sandy loam,3 to 8 116.4 22.4% percent slopes 305C Paxton fine sandy loam,8 to 25.0 4.8% 15 percent slopes 305D Paxton fine sandy loam, 15 to 8.7 1.7% 25 percent slopes 306B Paxton fine sandy loam,0 to 8 1.0 0.2% percent slopes,very stony 306C Paxton fine sandy loam,8 to 2.1 0.4% 15 percent slopes,very stony 306D Paxton fine sandy loam, 15 to 0.0 0.0% 25 percent slopes,very stony 310B Woodbridge fine sandy loam,3 56.5 10.9% to 8 percent slopes 310C Woodbridge fine sandy loam,8 8.2 1.6% to 15 percent slopes 311 B Woodbridge fine sandy loam,0 10.7 2.1% to 8 percent slopes,very stony 405C Charlton fine sandy loam,8 to 1.5 0.3% 15 percent slopes 410B Sutton fine sandy loam,3 to 8 0.2 0.0% percent slopes 421 B Canton fine sandy loam,0 to 8 1.6 0.3% percent slopes,very stony 602 Urban land 217.6 41.9% 651 Udorthents,smoothed 13.8 2.7% 715B Ridgebury and Leicester fine 8.9 1.7% sandy loams,3 to 8 percent slopes,extremely stony Totals for Area of Interest 519.2 100.0% USDA Natural Resources Web Soil Survey 6/27/2023 Conservation Service National Cooperative Soil Survey Page 3 of 3 Attachments PRE-DEVELOPMENT SUBCATCHMENT PLAN POST-DEVELOPMENT SUBCATCHMENT PLAN HYDROCAD WORKSHEETS USGS TOPOGRAPHIC MAP NHESP ENDANGERED SPECIES AND CRITICAL HABITAT MAP FEMA FIRMETTE MAP ASSESSORS MAP 34A, BLOCK 75, LOT 1B ZONING INDUSTRIAL 2 DISTRICT PROPOSED USE- RECREATION AREA SPECIAL PERMIT REQUIRED *SEE NORTH ANDOIVER ZONING BYLAW TABLE 1: SUMMAR Y OF USE REGULA TIONS I ff ASSESSORS MAP g34A, &OCK 75, L 0 T 18 ZONING INDUSTRIAL 2 DISTRICT WA TERSHED PROTECTION DISTRICT PROPOSED USE- RECREA TION AREA SPECIAL PERMIT REQUIRED *SEE NORTH ANO0 VER ZONING B YLA W TABLE 1: SUMMAR Y OF USE REGULA TONS �1 / 1� 1S 2S Overland to Terminal Rd Overland to Old Clark North Rd & Sutton St PRE Subcat Reach and Link Routing Diagram for27016hyd-R1 Prepared by Hancock Associates, Printed 11/6/2023 HydroCAD®10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC 27016hyd-RI Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Area Listing(selected nodes) Area CN Description (sq-ft) (subcatchment-numbers) 107,205 74 >75%Grass cover,Good,HSG C (1S,2S) 27,445 70 Woods,Good,HSG C (1S,2S) 134,650 73 TOTAL AREA 27016hyd-RI Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Soil Listing(selected nodes) Area Soil Subcatchment (sq-ft) Group Numbers 0 HSG A 0 HSG B 134,650 HSG C 1S,2S 0 HSG D 0 Other 134,650 TOTAL AREA 27O16hyd-R1 Type///24-hr 2-Year Rainfall=3.15" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs,dt=0.05 hrs,301 points Runoff by SCS TR-20 method,UH=SCS,Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 1S:Overland to Terminal Rd North Runoff Area=45,165 sf 0.00%Impervious Runoff Depth>0.86" Flow Length=270' Tc=20.8 min CN=73 Runoff=0.71 cfs 3,232 cf Subcatchment 2S:Overland to Old Clark Rd&Sutton St Runoff Area=89,485 sf 0.00%Impervious Runoff Depth>0.86" Flow Length=570' Tc=24.9 min CN=73 Runoff=1.30 cfs 6,391 cf Total Runoff Area=134,650 sf Runoff Volume=9,623 cf Average Runoff Depth=0.86" 100.00%Pervious=134,650 sf 0.00%Impervious=0 sf 27016hyd-RI Type///24-hr 2-Year Rainfall=3.15" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 @ 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S:Overland to Terminal Rd North Runoff = 0.71 cfs @ 12.32 hrs, Volume= 3,232 cf, Depth> 0.86" Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 2-Year Rainfall=3.15" Area(sf) CN Description 34,680 74 >75%Grass cover,Good, HSG C 10,485 70 Woods,Good, HSG C 45,165 73 Weighted Average 45,165 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.5 50 0.0100 0.05 Sheet Flow, Woods: Light underbrush n=0.400 P2=3.10" 4.3 220 0.0150 0.86 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 20.8 270 Total Summary for Subcatchment 2S:Overland to Old Clark Rd&Sutton St Runoff = 1.30 cfs @ 12.38 hrs, Volume= 6,391 cf, Depth> 0.86" Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 2-Year Rainfall=3.15" Area(sf) CN Description 72,525 74 >75%Grass cover,Good, HSG C 16,960 70 Woods,Good, HSG C 89,485 73 Weighted Average 89,485 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.5 50 0.0200 0.07 Sheet Flow, Woods:Light underbrush n=0.400 P2=3.10" 12.4 520 0.0100 0.70 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 24.9 570 Total 27016hyd-RI Type III 24-hr 10-Year Rainfall=4.99" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 @ 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S:Overland to Terminal Rd North Runoff = 1.81 cfs @ 12.30 hrs, Volume= 7,869 cf, Depth> 2.09" Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 10-Year Rainfall=4.99" Area(sf) CN Description 34,680 74 >75%Grass cover,Good, HSG C 10,485 70 Woods,Good, HSG C 45,165 73 Weighted Average 45,165 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.5 50 0.0100 0.05 Sheet Flow, Woods: Light underbrush n=0.400 P2=3.10" 4.3 220 0.0150 0.86 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 20.8 270 Total Summary for Subcatchment 2S:Overland to Old Clark Rd&Sutton St Runoff = 3.32 cfs @ 12.36 hrs, Volume= 15,565 cf, Depth> 2.09" Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 10-Year Rainfall=4.99" Area(sf) CN Description 72,525 74 >75%Grass cover,Good, HSG C 16,960 70 Woods,Good, HSG C 89,485 73 Weighted Average 89,485 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.5 50 0.0200 0.07 Sheet Flow, Woods:Light underbrush n=0.400 P2=3.10" 12.4 520 0.0100 0.70 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 24.9 570 Total 27016hyd-RI Type///24-hr 25-Year Rainfall=6.14" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 @ 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S:Overland to Terminal Rd North Runoff = 2.57 cfs @ 12.29 hrs, Volume= 11,164 cf, Depth> 2.97" Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 25-Year Rainfall=6.14" Area(sf) CN Description 34,680 74 >75%Grass cover,Good, HSG C 10,485 70 Woods,Good, HSG C 45,165 73 Weighted Average 45,165 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.5 50 0.0100 0.05 Sheet Flow, Woods: Light underbrush n=0.400 P2=3.10" 4.3 220 0.0150 0.86 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 20.8 270 Total Summary for Subcatchment 2S:Overland to Old Clark Rd&Sutton St Runoff = 4.72 cfs @ 12.35 hrs, Volume= 22,086 cf, Depth> 2.96" Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 25-Year Rainfall=6.14" Area(sf) CN Description 72,525 74 >75%Grass cover,Good, HSG C 16,960 70 Woods,Good, HSG C 89,485 73 Weighted Average 89,485 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.5 50 0.0200 0.07 Sheet Flow, Woods:Light underbrush n=0.400 P2=3.10" 12.4 520 0.0100 0.70 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 24.9 570 Total 27016hyd-RI Type///24-hr 100-Year Rainfall=7.91" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 @ 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S:Overland to Terminal Rd North Runoff = 3.80 cfs @ 12.29 hrs, Volume= 16,574 cf, Depth> 4.40" Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 100-Year Rainfall=7.91" Area(sf) CN Description 34,680 74 >75%Grass cover,Good, HSG C 10,485 70 Woods,Good, HSG C 45,165 73 Weighted Average 45,165 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.5 50 0.0100 0.05 Sheet Flow, Woods: Light underbrush n=0.400 P2=3.10" 4.3 220 0.0150 0.86 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 20.8 270 Total Summary for Subcatchment 2S:Overland to Old Clark Rd&Sutton St Runoff = 6.98 cfs @ 12.34 hrs, Volume= 32,793 cf, Depth> 4.40" Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 100-Year Rainfall=7.91" Area(sf) CN Description 72,525 74 >75%Grass cover,Good, HSG C 16,960 70 Woods,Good, HSG C 89,485 73 Weighted Average 89,485 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.5 50 0.0200 0.07 Sheet Flow, Woods:Light underbrush n=0.400 P2=3.10" 12.4 520 0.0100 0.70 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 24.9 570 Total 17S 13S Lawn&Woods Porous Pavement 9S A 16R Overland to Terminal Porous Pavement Old Clark Rd&Sutton Rd North expanded resvr Drainage System 14S Roof POST Subcat Reach and Link Routing Diagram for27016hyd-R1 Prepared by Hancock Associates, Printed 11/6/2023 HydroCAD®10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC 27016hyd-RI Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Area Listing(selected nodes) Area CN Description (sq-ft) (subcatchment-numbers) 53,505 74 >75%Grass cover,Good,HSG C (9S,17S) 1,175 98 Paved parking,HSG C (9S) 19,240 61 Porous Pavement (13S) 39,100 98 Roofs,HSG C (14S) 21,630 70 Woods,Good,HSG C (9S,17S) 134,650 79 TOTAL AREA 27016hyd-RI Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Soil Listing(selected nodes) Area Soil Subcatchment (sq-ft) Group Numbers 0 HSG A 0 HSG B 115,410 HSG C 9S,145,17S 0 HSG D 19,240 Other 13S 134,650 TOTAL AREA 27016hyd-RI Type///24-hr 2-Year Rainfall=3.15" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Time span=5.00-20.00 hrs,dt=0.05 hrs,301 points Runoff by SCS TR-20 method,UH=SCS,Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 9S:Overland to Terminal Rd North Runoff Area=27,115 sf 4.33%Impervious Runoff Depth>0.92" Flow Length=150' Tc=5.0 min CN=74 Runoff=0.70 cfs 2,070 cf Subcatchment 13S:Porous Pavement Runoff Area=19,240 sf 0.00%Impervious Runoff Depth>0.37" Tc=6.0 min CN=61 Runoff=0.13 cfs 593 cf Subcatchment 14S:Roof Runoff Area=39,100 sf 100.00%Impervious Runoff Depth>2.73" Tc=6.0 min CN=98 Runoff=2.68 cfs 8,888 cf Subcatchment 17S:Lawn&Woods Runoff Area=49,195 sf 0.00%Impervious Runoff Depth>0.86" Flow Length=190' Tc=7.7 min CN=73 Runoff=1.09 cfs 3,542 cf Reach 1611:Old Clark Rd&Sutton Drainage System Inflow=1.09 cfs 3,542 cf Outflow=1.09 cfs 3,542 cf Pond 13P:Porous Pavement expanded resvr Peak Elev=159.18' Storage=2,425 cf Inflow=2.80 cfs 9,481 cf Discarded=0.52 cfs 9,496 cf Primary=0.00 cfs 0 cf Outflow=0.52 cfs 9,496 cf Total Runoff Area=134,650 sf Runoff Volume=15,092 cf Average Runoff Depth=1.35" 70.09%Pervious=94,375 sf 29.91%Impervious=40,275 sf 27016hyd-RI Type///24-hr 2-Year Rainfall=3.15" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Summary for Subcatchment 9S:Overland to Terminal Rd North Runoff = 0.70 cfs @ 12.09 hrs, Volume= 2,070 cf, Depth> 0.92" Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 2-Year Rainfall=3.15" Area(sf) CN Description 16,415 74 >75%Grass cover,Good, HSG C 9,525 70 Woods,Good,HSG C 1,175 98 Paved parking, HSG C 27,115 74 Weighted Average 25,940 95.67%Pervious Area 1,175 4.33%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.3 50 0.0800 0.25 Sheet Flow, Grass:Short n=0.150 P2=3.10" 1.7 100 0.0200 0.99 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 5.0 150 Total Summary for Subcatchment 135: Porous Pavement Runoff = 0.13 cfs @ 12.13 hrs, Volume= 593 cf, Depth> 0.37" Routed to Pond 13P:Porous Pavement expanded resvr Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 2-Year Rainfall=3.15" Area(sf) CN Description * 19,240 61 Porous Pavement 19,240 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 145: Roof Runoff = 2.68 cfs @ 12.09 hrs, Volume= 8,888 cf, Depth> 2.73" Routed to Pond 13P:Porous Pavement expanded resvr Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 2-Year Rainfall=3.15" Area(sf) CN Description 39,100 98 Roofs,HSG C 39,100 100.00%Impervious Area 27016hyd-RI Type///24-hr 2-Year Rainfall=3.15" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 @ 2023 HydroCAD Software Solutions LLC Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 17S: Lawn&Woods Runoff = 1.09 cfs @ 12.12 hrs, Volume= 3,542 cf, Depth> 0.86" Routed to Reach 16R:Old Clark Rd&Sutton Drainage System Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 2-Year Rainfall=3.15" Area(sf) CN Description 12,105 70 Woods,Good, HSG C 37,090 74 >75%Grass cover,Good, HSG C 49,195 73 Weighted Average 49,195 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.1 20 0.1800 0.29 Sheet Flow, Grass:Short n=0.150 P2=3.10" 4.2 30 0.0160 0.12 Sheet Flow, Grass:Short n=0.150 P2=3.10" 2.4 140 0.0200 0.99 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 7.7 190 Total Summary for Reach 16R:Old Clark Rd&Sutton Drainage System Inflow Area= 107,535 sf, 36.36%Impervious, Inflow Depth> 0.40" for 2-Year event Inflow = 1.09 cfs @ 12.12 hrs, Volume= 3542 cf Outflow = 1.09 cfs @ 12.12 hrs, Volume= 3,542 cf, Atten=0%, Lag=0.0 min Routing by Dyn-Stor-Ind method,Time Span=5.00-20.00 hrs,dt=0.05 hrs Summary for Pond 13P: Porous Pavement expanded resvr Inflow Area= 58,340 sf, 67.02%Impervious, Inflow Depth> 1.95" for 2-Year event Inflow = 2.80 cfs @ 12.09 hrs, Volume= 9,481 cf Outflow = 0.52 cfs @ 11.85 hrs, Volume= 9,496 cf, Atten=81%, Lag=0.0 min Discarded = 0.52 cfs @ 11.85 hrs, Volume= 9,496 cf Primary = 0.00 cfs @ 5.00 hrs, Volume= 0 cf Routed to Reach 16R:Old Clark Rd&Sutton Drainage System Routing by Dyn-Stor-Ind method,Time Span=5.00-20.00 hrs,dt=0.05 hrs Peak Elev=159.18'@ 12.55 hrs Surf.Area=21,950 sf Storage=2,425 cf Plug-Flow detention time=(not calculated:outflow precedes inflow) Center-of-Mass det.time=26.0 min(772.2-746.2) Volume Invert Avail.Storage Storage Description #1 158.90' 8,078 cf Custom Stage Data(Prismatic)Listed below(Recalc) 20,194 cf Overall x 40.0%Voids 27O16hyd-R1 Type///24-hr 2-Year Rainfall=3.15" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 158.90 21,950 0 0 159.57 21,950 14,706 14,706 159.82 21,950 5,488 20,194 Device Routing Invert Outlet Devices #1 Discarded 158.90' 1.020 in/hr Exfiltration over Surface area #2 Device 3 159.52' 4.0'long Sharp-Crested Rectangular Weir 2 End Contraction(s) #3 Primary 156.10' 12.0" Round Culvert L=136.0' CPP,projecting,no headwall, Ke=0.900 inlet/Outlet Invert=156.10'/150.20' S=0.0434'/' Cc=0.900 n=0.012 Corrugated PP,smooth interior, Flow Area=0.79 sf Discarded OutFlow Max=0.52 cfs @ 11.85 hrs HW=158.92' (Free Discharge) t1=Exfiltration (Exfiltration Controls 0.52 cfs) Primary OutFlow Max=0.00 cfs @ 5.00 hrs HW=158.90' TW=0.00' (Dynamic Tailwater) t3=Culvert (Passes 0.00 cfs of 4.53 cfs potential flow) t2=Sharp-Crested Rectangular Weir (Controls 0.00 cfs) 27016hyd-RI Type III 24-hr 10-Year Rainfall=4.99" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Summary for Subcatchment 9S:Overland to Terminal Rd North Runoff = 1.71 cfs @ 12.08 hrs, Volume= 4,934 cf, Depth> 2.18" Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 10-Year Rainfall=4.99" Area(sf) CN Description 16,415 74 >75%Grass cover,Good, HSG C 9,525 70 Woods,Good,HSG C 1,175 98 Paved parking, HSG C 27,115 74 Weighted Average 25,940 95.67%Pervious Area 1,175 4.33%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.3 50 0.0800 0.25 Sheet Flow, Grass:Short n=0.150 P2=3.10" 1.7 100 0.0200 0.99 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 5.0 150 Total Summary for Subcatchment 135: Porous Pavement Runoff = 0.63 cfs @ 12.10 hrs, Volume= 1,978 cf, Depth> 1.23" Routed to Pond 13P:Porous Pavement expanded resvr Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 10-Year Rainfall=4.99" Area(sf) CN Description * 19,240 61 Porous Pavement 19,240 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 145: Roof Runoff = 4.28 cfs @ 12.09 hrs, Volume= 14,368 cf, Depth> 4.41" Routed to Pond 13P:Porous Pavement expanded resvr Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 10-Year Rainfall=4.99" Area(sf) CN Description 39,100 98 Roofs,HSG C 39,100 100.00%Impervious Area 27016hyd-RI Type III 24-hr 10-Year Rainfall=4.99" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 17S: Lawn&Woods Runoff = 2.78 cfs @ 12.11 hrs, Volume= 8,613 cf, Depth> 2.10" Routed to Reach 16R:Old Clark Rd&Sutton Drainage System Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 10-Year Rainfall=4.99" Area(sf) CN Description 12,105 70 Woods,Good, HSG C 37,090 74 >75%Grass cover,Good, HSG C 49,195 73 Weighted Average 49,195 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.1 20 0.1800 0.29 Sheet Flow, Grass:Short n=0.150 P2=3.10" 4.2 30 0.0160 0.12 Sheet Flow, Grass:Short n=0.150 P2=3.10" 2.4 140 0.0200 0.99 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 7.7 190 Total Summary for Reach 16R:Old Clark Rd&Sutton Drainage System Inflow Area= 107,535 sf, 36.36%Impervious, Inflow Depth> 0.97" for 10-Year event Inflow = 2.78 cfs @ 12.11 hrs, Volume= 8,671 cf Outflow = 2.78 cfs @ 12.11 hrs, Volume= 8,671 cf, Atten=0%, Lag=0.0 min Routing by Dyn-Stor-Ind method,Time Span=5.00-20.00 hrs,dt=0.05 hrs Summary for Pond 13P: Porous Pavement expanded resvr Inflow Area= 58,340 sf, 67.02%Impervious, Inflow Depth> 3.36" for 10-Year event Inflow = 4.90 cfs @ 12.09 hrs, Volume= 16,346 cf Outflow = 0.55 cfs @ 12.80 hrs, Volume= 16,372 cf, Atten=89%, Lag=42.9 min Discarded = 0.52 cfs @ 11.70 hrs, Volume= 16,314 cf Primary = 0.03 cfs @ 12.80 hrs, Volume= 57 cf Routed to Reach 16R:Old Clark Rd&Sutton Drainage System Routing by Dyn-Stor-Ind method,Time Span=5.00-20.00 hrs,dt=0.05 hrs Peak Elev=159.54'@ 12.80 hrs Surf.Area=21,950 sf Storage=5,608 cf Plug-Flow detention time=(not calculated:outflow precedes inflow) Center-of-Mass det.time=78.1 min(824.2-746.1) Volume Invert Avail.Storage Storage Description #1 158.90' 8,078 cf Custom Stage Data(Prismatic)Listed below(Recalc) 20,194 cf Overall x 40.0%Voids 27O16hyd-R1 Type III 24-hr 10-Year Rainfall=4.99" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 158.90 21,950 0 0 159.57 21,950 14,706 14,706 159.82 21,950 5,488 20,194 Device Routing Invert Outlet Devices #1 Discarded 158.90' 1.020 in/hr Exfiltration over Surface area #2 Device 3 159.52' 4.0'long Sharp-Crested Rectangular Weir 2 End Contraction(s) #3 Primary 156.10' 12.0" Round Culvert L=136.0' CPP,projecting,no headwall, Ke=0.900 inlet/Outlet Invert=156.10'/150.20' S=0.0434'/' Cc=0.900 n=0.012 Corrugated PP,smooth interior, Flow Area=0.79 sf Discarded OutFlow Max=0.52 cfs @ 11.70 hrs HW=158.91' (Free Discharge) t1=Exfiltration (Exfiltration Controls 0.52 cfs) Primary OutFlow Max=0.03 cfs @ 12.80 hrs HW=159.54' TW=0.00' (Dynamic Tailwater) t3=Culvert (Passes 0.03 cfs of 5.12 cfs potential flow) t2=Sharp-Crested Rectangular Weir (Weir Controls 0.03 cfs @ OAS fps) 27016hyd-RI Type///24-hr 25-Year Rainfall=6.14" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Summary for Subcatchment 9S:Overland to Terminal Rd North Runoff = 2.41 cfs @ 12.08 hrs, Volume= 6,954 cf, Depth> 3.08" Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 25-Year Rainfall=6.14" Area(sf) CN Description 16,415 74 >75%Grass cover,Good, HSG C 9,525 70 Woods,Good,HSG C 1,175 98 Paved parking, HSG C 27,115 74 Weighted Average 25,940 95.67%Pervious Area 1,175 4.33%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.3 50 0.0800 0.25 Sheet Flow, Grass:Short n=0.150 P2=3.10" 1.7 100 0.0200 0.99 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 5.0 150 Total Summary for Subcatchment 135: Porous Pavement Runoff = 1.02 cfs @ 12.10 hrs, Volume= 3,077 cf, Depth> 1.92" Routed to Pond 13P:Porous Pavement expanded resvr Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 25-Year Rainfall=6.14" Area(sf) CN Description * 19,240 61 Porous Pavement 19,240 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 145: Roof Runoff = 5.28 cfs @ 12.09 hrs, Volume= 17,779 cf, Depth> 5.46" Routed to Pond 13P:Porous Pavement expanded resvr Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 25-Year Rainfall=6.14" Area(sf) CN Description 39,100 98 Roofs,HSG C 39,100 100.00%Impervious Area 27016hyd-RI Type 11124-hr 25-Year Rainfall=6.14" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 17S: Lawn&Woods Runoff = 3.95 cfs @ 12.11 hrs, Volume= 12,216 cf, Depth> 2.98" Routed to Reach 16R:Old Clark Rd&Sutton Drainage System Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 25-Year Rainfall=6.14" Area(sf) CN Description 12,105 70 Woods,Good, HSG C 37,090 74 >75%Grass cover,Good, HSG C 49,195 73 Weighted Average 49,195 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.1 20 0.1800 0.29 Sheet Flow, Grass:Short n=0.150 P2=3.10" 4.2 30 0.0160 0.12 Sheet Flow, Grass:Short n=0.150 P2=3.10" 2.4 140 0.0200 0.99 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 7.7 190 Total Summary for Reach 16R:Old Clark Rd&Sutton Drainage System Inflow Area= 107,535 sf, 36.36%Impervious, Inflow Depth> 1.62" for 25-Year event Inflow = 3.95 cfs @ 12.11 hrs, Volume= 14,510 cf Outflow = 3.95 cfs @ 12.11 hrs, Volume= 14510 cf, Atten=0%, Lag=0.0 min Routing by Dyn-Stor-Ind method,Time Span=5.00-20.00 hrs,dt=0.05 hrs Summary for Pond 13P: Porous Pavement expanded resvr Inflow Area= 58,340 sf, 67.02%Impervious, Inflow Depth> 4.29" for 25-Year event Inflow = 6.29 cfs @ 12.09 hrs, Volume= 20,856 cf Outflow = 1.42 cfs @ 12.50 hrs, Volume= 20,855 cf, Atten=77%, Lag=24.7 min Discarded = 0.52 cfs @ 11.55 hrs, Volume= 18,561 cf Primary = 0.90 cfs @ 12.50 hrs, Volume= 2,294 cf Routed to Reach 16R:Old Clark Rd&Sutton Drainage System Routing by Dyn-Stor-Ind method,Time Span=5.00-20.00 hrs,dt=0.05 hrs Peak Elev=159.69'@ 12.50 hrs Surf.Area=21,950 sf Storage=6,923 cf Plug-Flow detention time=(not calculated:outflow precedes inflow) Center-of-Mass det.time=78.7 min(824.8-746.1) Volume Invert Avail.Storage Storage Description #1 158.90' 8,078 cf Custom Stage Data(Prismatic)Listed below(Recalc) 20,194 cf Overall x 40.0%Voids 27O16hyd-R1 Type 11124-hr 25-Year Rainfall=6.14" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 158.90 21,950 0 0 159.57 21,950 14,706 14,706 159.82 21,950 5,488 20,194 Device Routing Invert Outlet Devices #1 Discarded 158.90' 1.020 in/hr Exfiltration over Surface area #2 Device 3 159.52' 4.0'long Sharp-Crested Rectangular Weir 2 End Contraction(s) #3 Primary 156.10' 12.0" Round Culvert L=136.0' CPP,projecting,no headwall, Ke=0.900 inlet/Outlet Invert=156.10'/150.20' S=0.0434'/' Cc=0.900 n=0.012 Corrugated PP,smooth interior, Flow Area=0.79 sf Discarded OutFlow Max=0.52 cfs @ 11.55 hrs HW=158.91' (Free Discharge) t1=Exfiltration (Exfiltration Controls 0.52 cfs) Primary OutFlow Max=0.90 cfs @ 12.50 hrs HW=159.69' TW=0.00' (Dynamic Tailwater) t3=Culvert (Passes 0.90 cfs of 5.25 cfs potential flow) t2=Sharp-Crested Rectangular Weir (Weir Controls 0.90 cfs @ 1.34 fps) 27016hyd-RI Type///24-hr 100-Year Rainfall=7.91" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Summary for Subcatchment 9S:Overland to Terminal Rd North Runoff = 3.53 cfs @ 12.08 hrs, Volume= 10,254 cf, Depth> 4.54" Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 100-Year Rainfall=7.91" Area(sf) CN Description 16,415 74 >75%Grass cover,Good, HSG C 9,525 70 Woods,Good,HSG C 1,175 98 Paved parking, HSG C 27,115 74 Weighted Average 25,940 95.67%Pervious Area 1,175 4.33%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.3 50 0.0800 0.25 Sheet Flow, Grass:Short n=0.150 P2=3.10" 1.7 100 0.0200 0.99 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 5.0 150 Total Summary for Subcatchment 135: Porous Pavement Runoff = 1.70 cfs @ 12.10 hrs, Volume= 4,994 cf, Depth> 3.12" Routed to Pond 13P:Porous Pavement expanded resvr Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 100-Year Rainfall=7.91" Area(sf) CN Description * 19,240 61 Porous Pavement 19,240 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 145: Roof Runoff = 6.81 cfs @ 12.09 hrs, Volume= 23,014 cf, Depth> 7.06" Routed to Pond 13P:Porous Pavement expanded resvr Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 100-Year Rainfall=7.91" Area(sf) CN Description 39,100 98 Roofs,HSG C 39,100 100.00%Impervious Area 27016hyd-RI Type11124-hr 100-year Rainfall=7.91" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 @ 2023 HydroCAD Software Solutions LLC Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Subcatchment 17S: Lawn&Woods Runoff = 5.83 cfs @ 12.11 hrs, Volume= 18,129 cf, Depth> 4.42" Routed to Reach 16R:Old Clark Rd&Sutton Drainage System Runoff by SCS TR-20 method, UH=SCS,Weighted-CN,Time Span=5.00-20.00 hrs,dt=0.05 hrs Type III 24-hr 100-Year Rainfall=7.91" Area(sf) CN Description 12,105 70 Woods,Good, HSG C 37,090 74 >75%Grass cover,Good, HSG C 49,195 73 Weighted Average 49,195 100.00%Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.1 20 0.1800 0.29 Sheet Flow, Grass:Short n=0.150 P2=3.10" 4.2 30 0.0160 0.12 Sheet Flow, Grass:Short n=0.150 P2=3.10" 2.4 140 0.0200 0.99 Shallow Concentrated Flow, Short Grass Pasture Kv=7.0 fps 7.7 190 Total Summary for Reach 16R:Old Clark Rd&Sutton Drainage System Inflow Area= 107,535 sf, 36.36%Impervious, Inflow Depth> 2.77" for 100-Year event Inflow = 6.79 cfs @ 12.25 hrs, Volume= 24,846 cf Outflow = 6.79 cfs @ 12.25 hrs, Volume= 24,846 cf, Atten=0%, Lag=0.0 min Routing by Dyn-Stor-Ind method,Time Span=5.00-20.00 hrs,dt=0.05 hrs Summary for Pond 13P: Porous Pavement expanded resvr Inflow Area= 58,340 sf, 67.02%Impervious, Inflow Depth> 5.76" for 100-Year event Inflow = 8.49 cfs @ 12.09 hrs, Volume= 28,009 cf Outflow = 4.03 cfs @ 12.27 hrs, Volume= 28,035 cf, Atten=53%, Lag=10.9 min Discarded = 0.52 cfs @ 11.25 hrs, Volume= 21,318 cf Primary = 3.51 cfs @ 12.27 hrs, Volume= 6,716 cf Routed to Reach 16R:Old Clark Rd&Sutton Drainage System Routing by Dyn-Stor-Ind method,Time Span=5.00-20.00 hrs,dt=0.05 hrs Peak Elev=159.94'@ 12.27 hrs Surf.Area=21,950 sf Storage=8,078 cf Plug-Flow detention time=(not calculated:outflow precedes inflow) Center-of-Mass det.time=73.5 min(819.4-745.9) Volume Invert Avail.Storage Storage Description #1 158.90' 8,078 cf Custom Stage Data(Prismatic)Listed below(Recalc) 20,194 cf Overall x 40.0%Voids 27O16hyd-R1 Type 11124-hr 100-Year Rainfall=7.91" Prepared by Hancock Associates Printed 11/6/2023 HydroCAD°10.20-3c s/n 00711 ©2023 HydroCAD Software Solutions LLC Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 158.90 21,950 0 0 159.57 21,950 14,706 14,706 159.82 21,950 5,488 20,194 Device Routing Invert Outlet Devices #1 Discarded 158.90' 1.020 in/hr Exfiltration over Surface area #2 Device 3 159.52' 4.0'long Sharp-Crested Rectangular Weir 2 End Contraction(s) #3 Primary 156.10' 12.0" Round Culvert L=136.0' CPP,projecting,no headwall, Ke=0.900 inlet/Outlet Invert=156.10'/150.20' S=0.0434'/' Cc=0.900 n=0.012 Corrugated PP,smooth interior, Flow Area=0.79 sf Discarded OutFlow Max=0.52 cfs @ 11.25 hrs HW=158.91' (Free Discharge) t1=Exfiltration (Exfiltration Controls 0.52 cfs) Primary OutFlow Max=3.31 cfs @ 12.27 hrs HW=159.93' TW=0.00' (Dynamic Tailwater) t3=Culvert (Passes 3.31 cfs of 5.44 cfs potential flow) t2=Sharp-Crested Rectangular Weir (Weir Controls 3.31 cfs @ 2.08 fps) !1 1(�/�[� U.S.DEPARTMENT OF THE INTERIOR m, SOUTH GROVELAND QUADRANGLE MUSGS U.S.GEOLOGICAL SURVEY Y�4" MSSACMUSETTS-ESSEN COUNTY US Topo 1.-.LNUTC 11AIEi u r `M Mtrri UFN am4a, u .TOWN 33 Mo nr,R oq l \ a y me raamu+�,, r p'a ✓ u ✓ _ ✓✓ 5 LOCUS 31 30 0 ,e�H r _ � wx '..H. E o , ` ✓N ��r.. �� i oa x ✓"�, "� „„� " w � I 17 4 i ✓ y✓ w s e e � ✓ u. E ,un � j i r 11 ✓ e N 1e t � v ea survrry SCALE 124000 d' wnu unsr AT ory mmmm. .n..a. o.w SOUTH GROVE AND,MA NHESP Priority Habitats of Rare Species NHESP Estimated Habitats of Rare Wildlife a V � Property Tax Parcels M -- a s . z IM ..� ,NIA z 46 m x. -q*ad Hip , _ TaN a s- ' "Pig _ s a� t -14 z- National Flood Hazard Layer FIRMette FEMA Legend 71°T25"W 42°43'3"N SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT Without Base Flood Elevation(BFE) \\ y SPECIAL FLOOD _ zf,\ With BFE or DepthZcnaAe,AO,AYc',Ak AZARD H`� _ ` AREAS Regulatory Floodway 0. %Annual Chance Flood Hazard,Areas of 1/o annual chance flood with average „ depth less than one foot or with drainage areas of less than one square mile Z-e X own mmk\\ Future Conditions 1%Annual Ilk Chance Flood Hazard — Area with Reduced Flood Risk due to o`g OTHER AREAS OF Levee.See Notes.z-e x HAZARD FLOOD �\ ,� A Area with Flood Risk due to Levee Z-e ��\ AAA\ � � Area of Minimal Flood Hazard _ Effective LOMR NO SCREEN F ��-AP OTHER AREAS Area of Undetermined Flood Hazard -_ GENERAL -—-` Channel,Culvert,or Storm Sewer STRUCTURES I 1 1 I 1 1 I Levee,Dike,or Floodwall \ a zo.z Cross Sections with l°lo Annual Chance `\\ \\ �zs Water Surface Elevation AREKOF-MNIM\\ v ` \ � � a - Coastal Transect s,— Base Flood Elevation Line BFE Limit of Study �( i �� � .' Jurisdiction Boundary Coastal Transect Baseline \\ \ \ --)5W98 OTHER g Profile Baseline FEATURES Hydrographic Feature Digital Data Available N No Digital Data Available \ . \ MAP PANEL Unmapped Lk The pin displayed on the map is an approximate _ point selected by the user and does not represent �. an authoritative property location_ Nk This map complies with FEMA's standards for the use of g M� y `�` _ digital flood maps if it is not void as described below. The basemap shown complies with FEMA's basemap accuracy standards v The flood hazard information is derived directly from the authoritative NFHL web services provided by FEMA_This map was exported on 8/21/2023 of 2:50 PM and does not reflect changes or amendments subsequent to this date and �.:. time.The NFHL and effective information may change or become superseded by new data overtime. This map image is void if the one or more of the following map elements do not appear:basemap imagery,flood zone labels, legend,scale bar,map creation date,community identifiers, 71°6'47"W 42°42'36"N FIRM panel number,and FIRM effective date.Map images for Feet 1:6 000 unmapped and unmodernized areas cannot be used for 0 250 500 1,000 1,500 2,000 regulatory purposes. Basemap Imagery Source:USGS National Map 2023 Lli w -5-tr f 0f CB 5�4 RIM=156.30 �, �s' x 158.55 ff fo UP 1� x 158.82 I 4452 , x115E 1 i �y 158.01 1/ 159.13 x 158.05 \\ x158.24 � , 1 s <01 UP 4451 \y ,� LEGEND EOP EDGE OF PA VEMENT CCB CAPE COD BERM /CC INTEGRAL CONCRETE CURB Lz- r, 1 I 1 j1 r _.1 j - 1 i SOIL TEST DA TA DA TE.• 7/23/23 EVALUATOR: BRIAN GEAUDREAU PE TP-1: 0-16" A TOPSOIL 16-42" B LS 42-88"f C LS REDOX ® 42", NO REFUSAL, ESHW ® 42" TP-2.- 0-20" A TOPSOIL 20-38" B LS 38-96"+ C LS REDOX ® 38", NO REFUSAL ESHW ® 38" TP-3.- 0-4" A TOPSOIL 4-22" B LS 22-94"4 C LS REDOX ® 22", NO REFUSAL ESHW ® 22" TP-4. 0-4" A TOPSOIL 4-20" B LS 20-84"f C LS =1, REDOX ® 20", NO REFUSAL l ESHW ® 20" j TP-5.- 0-6" A TOPSOIL - 6-22" B LS � � - -- - � 22-60'f C LS = _- REDOX @ 22, NO REFUSAL — ESHW 922" 0-10" A TOPSOIL 10-24" B LS 24-60"f C LS REDOX @ 24", NO REFUSAL ESHW ® 24" �7 TP-7.• — 0-4" A TOPSOIL t 4-18" 8 LS c 161;8 �j DI VERSION RIDGE REQUIRED EPA CGP NO TE WHERE GRADE EXCEEDS 27. GREATER 1. S17F CONTRACTOR SHALL BE RESPONSIBLE FILING A CG Zq �R WITH THE EPA NO LESS THAN 30 DAYS PRIOR TO THI AN77CIPAT10N OF LAND DISTURBANCE 0VER ONE (1) f COPIES SHALL BE SUBMITTED TO BOTH THE ENGINEER ROADWAY RECORD AND MUNICIPAL ENGEERING OFFICE. STRAW BALES, GEOTEXTILE SANDBAGS, SECT/ON A A FIL TER FABRIC OR CONTINUOUS BERM OF EQUIVELENT \ SPILLWAY / NOTE: HEIGHT. USE SANDBAGS, o STRAW BALES OR SUPPLY WATER TO WASH ° OTHER APPROVED WHEELS IF NECESSARY METHODS TO CHANNELIZE RUNOFF TO BASIN AS REQUIRED _�� _ flow FLOWr4, 0 2'-3" CRUSHED STONE MINIMUM 6" THICK -- DIVERSION RIDGE 50' MIN, PLAN NOTES: 1. THE ENTRANCE SHALL BE MAINTAINED IN A CONDITION THAT — — WILL PREVENT TRACKING OR FLOWING OF SEDIMENT ONTO PUBLIC DI(`LJT nE- WA VC TLJIC AA A V DE-ni II[DC Tnr) nDCCCIKI(` DCD A ID �_ LIGHTING NOTES: LANDSCAPE NOTES. Luminaire Schedule 1. ALL INSTALLED LIGHTING SHALL BE DARK 1. THIS PLAN IS INTENDED TO SHOW Symbol Qty Lai SKIES COMPLIANT. SCHEMA TIC PLANTING AND LANDSCAPING WITHIN THE PROPOSED AREA OF WORK. 3 A 2. FULL CUTOFF LIGHTING SHALL BE INSTALLED PLANTING LIST IS INTENDED TO SHOW TO INSURE NO LIGHT/S EMITTED A80VE THE SUGGESTED NA77VE PLANTINGS BUT IS NOT HORIZONTAL PLANE. LIMITED TO SPECIES SPECIFIED. 2 A-1 J. LIGHTING SHALL CONSIST OF LED FIXTURES. 4 B WARMTH OF LIGH771VG SHALL BE DETERMINED BY PLANNING BOARD. Plant Palette Botanical Name Common !Name Size \ TREES: Pseudotsuga menziesii Douglas Fir 7-8' Corpus florida White Dogwood 2-2.5"cal Ulmus americana 'Princeton' Princeton Elm 2.5-3"cal Gleditsia triacanthos 'Skyline' Honeylocust 2.5-3"cal ° Platanus occidentalis American Sycamore 2.5-3"cal Acer rubrum 'Red Sunset Red Sunset Maple 2.5-3"cal 1� x Quercus rubra Red Oak 2.5-3"cal xx Pinus resinosa Red Pine 7-8' Amelanchier canadensis Downy Shadblow 2.5-3"cal — Tilia americana 'Redmond' Redmond American Linden 2.5-3"cal Aronia arbutifolia Brilliant Chokeberry 2-3' \ — Clethra alnifolia Sweet Pepper 2-3' - <<.�� Fothergilla gardenii Dwarf Fothergilla 2-2.5' *o Rhus aromatica Gro-Low Gro-Low Sumac #3pot Q Ilex glabra 'Shamrock' Shamrock lnkberry 2-2.5 fo o Itea virginica 'Little Henry' Little Henry Virginia Sweetspire 2-2.5 11c; Corpus alba 'Elegantissima' Varigated Red Twig Dogwood 2-3' Sambucus canadensis Elderberry 2-31 o Juniperus chinensis 'Sea Green' Sea Green Juniper 2-2.5 STRUCTURAL BEST MA NA GEMENT PRA CTICE POROUS PA VEMENT FREQUENT CLEANING AND MAINTENANCE ARE REQUIRED FOR THE PA VEMEV T SURFA CE TO PREVENT CL OGGING AS THE SURFA CE A C IS AS THE PRE TREA TMENT TO THE STONE RESER VOIR BEL OW. TO KEEP THE SURFACE CLEAN, FREQUENT VACUUM SWEEPING ALONG WITH ✓ET WASHING OF ASPHAL T AND CONCRETE PA VEMENT IS REQUIRED. NO WINTER SANDING SHALL BE CONDUCTED ON THE POROUS SURFACE. FOR PROPER MAINTENANCE.- •MINIMIZE SALT USE DURING WINTER MONTHS, •NO WINTER SANDING, •KEEP LANDSCAPED AREAS NEARBY WELL MAINTAINED TO PREVENT SOIL BEING TRANSPORTED ONTO THE PAVEMENT, •CLEAN THE SURFA CE A T LEAST MONTHL Y WI TH VA CUUM SWEEPING MA CHINES, •INSPECT SURFACE AND INSPECTION PORTS AFTER STORM EVENTS TO INSURE PROPER DRAINAGE, •NEVER RESEAL OR REPA VE WI TH IMPERMEABLE MA TERIAL, •INSPECT ANNUALL Y FOR DETERIORA TION OR SPALLING, -MONITOR TO ENSURE THA T THE PA VING SURFA CE DRAINS PROPERLY AFTER STORMS - AS NEEDED •CLEAN SURFACE USING POWER WASHER TO DISLODGE TRAPPED PARTICLES AND VACUUM SWEEP AREA - AS NEEDED •INSPECT SURFACE ANNUALL Y FOR DETERIORA TION •ASSESS EXFIL IRA TION CAPABILITY A T LEAST ONCE A YEAR. WHEN EXFIL IRA TION CAPACITY IS FOUND TO DECLINE, IMPLEMENT MEASURES FROM THE OPERATION AND MAINTENANCE PLAN TO RESTORE ORIGINAL EXFIL IRA TION CA PA CI TY. GRASS SWALE INSPECT SEMI-ANNUALL Y THE FIRST YEAR, AND A T LEAST ONCE A YEAR THEREAFTER. INSPECT THE GRASS FOR GROWTH AND THE SIDE SLOPES FOR SIGNS OF EROSION AND FORMA TION OF RILLS AND GULLIES. PLANT AN AL TERNA TI VE GRASS SPECIES IF THE ORIGINAL GRASS CO VER IS NO T SUCCESSFUL Y ESTABLISHED. IF GRASS GROWTH IS IMPAIRED BY WINTER ROAD SAL T OR OTHER DEICER USE, RE- ESTABLISH THE GRASS IN THE SPRING. TRASH/DEBRIS REMOVAL: REMOVE ACCUMULA TED TRASH AND DEBRIS PRIOR TO MOWING. SEDIMENT REMOVAL: CHECK ON A YEARLY BASIS AND CLEAN AS 1�j� 40.19 ❑ 0 North Andover 100 Ladder / Overall Len th 40. 190ft Overall Widt� 8. 930ft / Overall Body Height 1 . 563ft / Min Body Ground- Clearance 1 . 563ft Track Width 8. 930ft / Lock— to— lock time 6. 00s Max Steering Angle (Virtual ) 40. 600 / 1 I 1 1 1 1 CONSTRUCTION IN AREAS TO PLANTED OR UNIMPROVED AREAS CONSTRUCTION IN AREAS TO BE PA VED LANDSCAPE SURFACE RESTORA TION PA VEMENT TOPSOIL COMPACTED GRA VEL BASE O o O o O . W 111=111= I M I oe o M I I z I I M I M I M I II1=1I1=1I1=1 PC I I I—I I I—I I I III—III—I I I—I m III—III=III—II III=III=III= o 1=1 11=1 I I I I 1=1 11=1 11=1 I �, LA Y BACK SIDE SLOPES N OR PROVIDE STRUCTURAL SUPPORT FOR TRENCH NO 2 WALLS PER OSHA Z v REQUIREMENTS � m SPRINGLIKE HAUNCHING 6" BEDDING ° °° °°°° FOUNDATION STABILIZATION WHEN REQUIRED BY ENGINEER SHAPE BEDDING BY HAND OTHERWISE PLACE BEDDING ON TO FIT BOTTOM OF PIPE; INSTALL UNDISTURBED NATURAL SOIL PIPE ON STABLE BEDDING WITH UNIFORM BEARING UNDER FULL LENGTH OF PIPE BARREL. NO TES: FOUNDATION, BEDDING, do BACKFILL MA TERIALS [I j PLACE 3/4'f GRADED PIPE MA TERIAL HDP, PVC RC, DI GRANULAR BACKFILL AT OPTIMUM MOISTURE IN FOUNDA TION [6j [6j HORIZONTAL, 8"DEEP, ,—STABILIZATION LOOSE LAYERS; COMPACT BEDDING 1 117 1/7 TO 959 PER ASTM D-1557. 4" SCH40 CURBING, FINISH INSPECTION PORT TO EXTEND GRADE IN THROUGH RESERVIOR TO LANDSCAPE SUBGRADE. BRING SCREW CAP TO ISLANDS FINISH GRADE SCHEDULE APPLY FULL CO AGE OF ,7A CK COA T A T JO/ ELEVA TIONS SL OPE PER AS REQ D PLAN H — MIN EL AT FG 342" BIT. - 4" PERVIOUS CONC PA VEMENT G 4" UNTREA TED � 4„ 3/4- CRUSHED : ASPHALT MIX: PG 64-26 BASE STONE ry_ F WITH 5-POUNDS OF I FIBERS PER TON OF SUBGRADE �� l ASPHAL T MlX OR 12 (MIN) BANK INCREASE GRA VEL DEPTH TO RUN GRAVEL I APPROVED EQUAL. ACHIEVE FINISH GRADE L' I r CHOKER COURSE EL VA TIONS AS REQ'D. _J - - E ELEVA TION OF PEA STONE ANDS" OF 3/8" PEASTONE = = GENERAL CONSTRUE STONE RESERVOIR TO BE 6 _ _ - _ = D POROUS PA VEMEN T MAINA TAINED. _ 1. Porous to be it 8" OF 3/4"-1" 1 _J 1' 1 _ - 1 C completion of b -= 2. Install erosion c STONE RESER VIOR _' ='- _ _ _ ` J B devices. J. Clear and grub 6" PERF. PIPE required for cot W/ 2" COVER 2' MINIMUM 4. Remove, stocky ENGINEER SHALL INSPECT 5. Rough grade cc SUBGRADE OF POROUS side slopes. PA VEMENT SYSTEM PRIOR TO EST 6. Stabilize expose BACKFILL OF STONE _SEASONAL A vegetation. RESERVOIR TO VERIFY HIGH — 7. Rough grade pc INFIL TRA TION CAPACITY. GR0UNDWA TER areas, limiting c subgrade mater 8. Install utilities P NOTE.- THE FILTER COURSE POROUS PAVEMENT AREA SCHEDULE OF ELEVATIONS and parking are SHALL BE BANKRUN GRA VEL, 9. Grade the poroc MODIFIED NHDOT SPEC 304.1 PARKING LOT area to 2'8"f AND BE INSTALLED IN limiting compac .4rr0Rn.4/VrF W/TN //NNS(^ __ .. 11