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HomeMy WebLinkAbout2013-09-17 Planning Board Supplemental Materials (131) INSPECTION AND MAINTENANCE PLAN STORMWATER MANAGEMENT SYSTEM BUTCHER BOY MARKETPLACE 1077 OSGOOD STREET NORTH ANDOVER, MASSACHUSETTS Prepared for: Angus Realty Corporation 1077 Osgood Street North Andover, Massachusetts 01845 Prepared by: Lynnfield Engineering, Inc. 199 Newbury Street Suite 115 Danvers, Massachusetts 01923 September 16, 2013 -i- K:\480-60\Reports\091613_I&M Plan\toc.doc TABLE OF CONTENTS SECTION 1: GENERAL 1 1.1 General 1.2 Inspections and Maintenance of Stormwater BMPs 1 2 TABLES 1 Operation and Maintenance Budget FIGURES BMP Overall BMP Plan ATTACHMENTS 1 Stormwater Inspection Report Form and Site Inspection Checklist 2 Contech StormFilter Inspection and Maintenance Procedure Stormwater Chambers Operation and Maintenance Guidelines StormTech Chamber System Maintenance Guidelines StormTech Isolator Row Operations and Maintenance Manual APPENDICES A Emergency Response Plan -ii- K:\480-60\Reports\091613_I&M Plan\toc.doc This page has intentionally been left blank. -1- K:\480-60\Reports\091613_I&M Plan\txt.doc SECTION 1 PROJECT DESCRIPTION 1.1. GENERAL The Butcher Boy Marketplace site consists of an approximate nine acre parcel of land. The parcel is zoned General Business District per the Zoning Bylaw Town of North Andover last amended May 2004. The site is bound northerly by residential property; easterly by underdeveloped woodlands, and a residential home; southerly by Great Pond Road (State Route 133), and Lake Cochichewick; and, westerly by Osgood Street (State Route 125). The site is occupied by Butcher Boy Marketplace, a retail mall, and associated parking lot areas. The site is located within the Zone A to the Town’s Public Water Supply Lake Cochichewick. The Owner will be responsible for maintenance and implementation of this Inspection and Maintenance Plan. This Inspection and Maintenance Plan will be implemented for the entire Butcher Boy Marketplace Property. This Plan has been prepared to present Inspection and Maintenance measures to be implemented at the site to minimize potential impacts to the public water supply. An Emergency Response Plan has been prepared to handle potential releases at the site. A copy of the plan is presented in Appendix A. Figure No. 1 presents a plan of stormwater management system’s Best Management Practices (BMPs). Owner Angus Realty Corporation 1077 Osgood Street North Andover, MA 01845 Telephone: 978.688.1511 Facility Contact (Site Operation and Maintenance) Alan Yameen Angus Realty Corporation 1077 Osgood Street North Andover, MA 01845 Telephone: 978.688.1511 Engineer Richard Barthelmes, P.E. Lynnfield Engineering, Inc. 199 Newbury Street Suite 115 Danvers, MA 01923 Telephone: 978.777.7250 -2- K:\480-60\Reports\091613_I&M Plan\txt.doc 1.2 INSPECTIONS AND MAINTENANCE OF STORMWATER BMPS Catch basins Catchbasins shall be inspected four times per year for the first year. If the depth of sediment is not greater than two feet during the first year of inspection then the inspections shall be performed once per year. The catch basins shall be cleaned once the depth of sediment reaches two feet which is one half the sump depths or at a minimum annually. Vacuum trucks are preferred due to their effectiveness and they are less likely to damage the oil/grease hood. Cleaning will be completed at a minimum annually. Hydrodynamic Separator Units Units shall be inspected four times per year for the first year. After the first year the unit needs to be inspected once per year. Inspections should be performed with a “sludge judge” to measure the oil depth, if any, and the sediment depth. Cleaning is required when the sediment depth reaches 75% of the storage capacity of the unit or at a minimum annually. Cleaning must be performed with a vacuum truck. Attachment No. 2 presents the manufacturer inspection/maintenance guide for the units. Detention System The detention system shall be inspected four times per year for the first year. After the first year, the units shall be inspected annually. The detention system is equipped with inspection ports or manholes to visibly observe the bottom of the system. Visible observations shall be made of the bottom of bed for ponding water, debris or sediment, inspection of the inlet and outlet to ensure they are free from debris and sediment and that there are no other obstructions; inspection of the structural integrity of the units from above ground settlement or by observations from the ports/manholes. If the depth of sediment observed exceeds 3”, the affected chamber should be cleaned with high pressure water in accordance with the manufacturer’s maintenance guidelines. Maintenance shall be completed at a minimum annually. A copy of the manufacturer’s Operation and Maintenance Guidelines is presented in Attachment No. 2. Roof Dry Well The dry well system shall be inspected four times per year for the first year. After the first year, the dry wells shall be inspected annually. The dry well is equipped with inspection ports or manholes to visibly observe the bottom of the system. Visible observations shall be made of the bottom of bed for ponding water, debris or sediment; and inspection of the structural integrity of the units from above ground settlement or by observations from the ports/manholes. If the depth of sediment observed exceeds 3”, the affected dry well should be cleaned with high pressure water in accordance with the manufacturer’s maintenance guidelines. Maintenance shall be completed in accordance with the manufacturer’s suggested maintenance schedule or at a minimum annually. A copy of the manufacturer’s Operation and Maintenance Guidelines is presented in Attachment No. 2. Infiltration System The infiltration system shall be inspected four times per year for the first year. After the first year, the units shall be inspected annually. The infiltration system is equipped with inspection ports or manholes to visibly observe the bottom of the system. Visible -3- K:\480-60\Reports\091613_I&M Plan\txt.doc observations shall be made of the bottom of bed for ponding water, debris or sediment, inspection of the inlet and outlet to ensure they are free from debris and sediment and that there are no other obstructions; inspection of the structural integrity of the units from above ground settlement or by observations from the ports/manholes. If the depth of sediment observed exceeds 3”, the affected area should be cleaned with high pressure water in accordance with the manufacturer’s maintenance guidelines. Maintenance shall be completed at a minimum annually. A copy of the manufacturer’s Operation and Maintenance Guidelines is presented in Attachment No. 2. Storm Filter Stormwater filter system shall be inspected four times per year for the first year. After the first year, the filter shall be inspected annually. Visible observations shall be made of the filter for plugging. Based on the visible inspection, maintenance of the filter will be completed if any of the following conditions are observed: >4” accumulated on the vault floor; >¼” sediment accumulated on top of the filter cartridge; plugged filter media; and/or bypassing of the filter is occurring. StormFilter cartridges should be changed a minimum of once every three years or more frequently if above specified thresholds are met. At least one inspection per year shall be completed during wet weather to observe flow through the StormFilter. StormFilter maintenance shall be completed by qualified contractors trained in confined space entry. A copy of the manufacturer’s Operation and Maintenance Guidelines is presented in Attachment No. 2, Inspection and Maintenance Procedures. Isolator Row Units shall be inspected four times per year for the first year. After the first year the unit needs to be inspected once per year. Cleaning is required when a sediment depth of 3” is observed throughout the length of the isolator row of the storage capacity of the unit or at a minimum annually. Cleaning must be performed with a vacuum truck. Attachment No. 2 presents the manufacturer inspection/maintenance guide for the units. Maintenance of Landscaped Areas Landscaped and grass areas immediately adjacent to the proposed parking areas and buildings shall be mowed as required. Grass clippings shall be directed away from the stormwater systems. Fertilizers or pesticides shall not be used with grassed and landscaped areas. Pavement Maintenance Paved areas of the site shall be inspected on a regular basis and cleaned of accumulated sand and debris. At a minimum, paved areas shall be cleaned on an annual basis. Pavement cleaning shall be performed by a qualified contractor and all material removed transported off site for disposal. Paved areas of the site shall be swept on an annual basis. Snow Removal/Storage Snow from the proposed parking lot area will be stockpiled within designated areas or transported offsite by the snow removal contractor. No stockpiling or storage of snow from paved areas of the site is to be performed along Great Pond Road. Deicing chemicals are not to be utilized on the site. In compliance with the existing deed restrictions, pesticides, fertilizers and other chemical shall not be used on the site. -4- K:\480-60\Reports\091613_I&M Plan\txt.doc Debris and Litter Removal Trash may collect potentially causing clogging of the facilities. All litter and debris should be collected and removed from the site on a regular basis. Vehicle Washing Washing of vehicles is prohibited on the site. Operation and Maintenance Budget Operation and maintenance costs at the site includes third-party inspections, cleaning of catch basins and separator units and sweeping of the parking lot areas, Table No. 1 presents a summary of anticipated costs in the first year of operation following construction of the site. Inspections and cleaning of catch basins and separator units at the site may be reduced to annually based on the findings of the first year inspections completed. K:\480-60\Reports\091613_I&M Plan\Tab 1_O&M Budget.docx TABLE NO. 1 Operation and Maintenance Budget Butcher Boy Marketplace North Andover, MA Quarterly Third Party Inspections(1) $1,200 Annual Parking Lot Sweeping 500 Replacement StormFilter Media Cartridges(2) CDS System Maintenance(2) Detention System Maintenance(2) Quarterly Catch Basin Maintenance(1) 750 1,500 900 2,000 $6,850 10% Contingency 685 Total Estimated Annual Cost $7,535 (1)Inspection and cleaning frequency may be reduced to annually after year one based on the findings of stormwater inspections completed. (2)Souce: Sterling Stormwater Maintenance Services FIGURES K:\480-60\Cad\Drawings\Consult\Eaglebrook_082913\8-29-13 Overall BMP.dwg, 8/30/2013 2:14:27 PM, DWG To PDF.pc3 ATTACHMENT NO. 1 Stormwater Inspection Report Form and Site Inspection Checklist K:\480-60\Reports\082713_Insp and Maint Plan_SUPERCEDED\Stormwater Inspection Report Date/Time: Weather: Last Inspection: Inspector: Description Sediment Depth (in.)Presence of oil/debris (Y/N)Comments Butcher Boy Marketplace North Andover, MA Stormwater Inspection Report K:\480-60\Reports\082713_Insp and Maint Plan_SUPERCEDED\Site Inspection Checklist Inspected by: Date: A. Landscaped Areas 1.No debris, accumulated trash or litter, or grass or snow dumping 2.Proper signage in place for snow dumping 3.Evidence of erosion, siltation, or sedimentation B.Exterior Lot Area 1.Overall lot appearance satisfactory - free of accumulated litter, debris, and sand C.Drainage System 1.Stormceptor units being inspected and cleaned as needed, or at least once annually (records on file) 2.Catch basins and stormwater conveyances/discharges being inspected quarterly, and cleaned as needed or at least annually 3.Detention system being inspected and cleaned as needed or at least annually 4.Infiltration system being inspected and cleaned as needed or at least annually 5.Storm filters being inspected and cleaned as needed or at least annually 6.Insulator Rows being inspected and cleaned as needed or at least annually 7.Evidence of erosion, sand or debris, structural malfunction or damage 8.Catch basins free of accumulated debris, sediment, defects, and oily sheens D.Trash Management 1.Evidence of illegal, "midnight", dumping 2.Compactors/dumpsters and surrounding areas clean with no eivdence of leakage or spills/litter at dumpster, compactor and loading dock Explanation of Discrepancies (if necessary) North Andover, MA Site Inspection Checklist Butcher Boy Marketplace ATTACHMENT NO. 2 Contech StormFilter Inspection and Maintenance Procedure Stormwater Chambers Operation and Maintenance Guidelines StormTech Chamber System Maintenance Guidelines StormTech Isolator Row Operations and Maintenance Manual StormFilter Inspection and Maintenance Procedures In addition to these two activities, it is important to check the condition of the StormFilter unit after major storms for potential damage caused by high flows and for high sediment accumulation that may be caused by localized erosion in the drainage area. It may be necessary to adjust the inspection/ maintenance schedule depending on the actual operating conditions encountered by the system. In general, inspection activities can be conducted at any time, and maintenance should occur, if warranted, in late summer to early fall when flows into the system are not likely to be present. Maintenance Frequency The primary factor controlling timing of maintenance of the StormFilter is sediment loading. A properly functioning system will remove solids from water by trapping particulates in the porous structure of the filter media inside the cartridges. The flow through the system will naturally decrease as more and more particulates are trapped. Eventually the flow through the cartridges will be low enough to require replacement. It may be possible to extend the usable span of the cartridges by removing sediment from upstream trapping devices on a routine as-needed basis in order to prevent material from being re-suspended and discharged to the StormFilter treatment system. Site conditions greatly influence maintenance requirements. StormFilter units located in areas with erosion or active construction may need to be inspected and maintained more often than those with fully stabilized surface conditions. The maintenance frequency may be adjusted as additional monitoring information becomes available during the inspection program. Areas that develop known problems should be inspected more frequently than areas that demonstrate no problems, particularly after major storms. Ultimately, inspection and maintenance activities should be scheduled based on the historic records and characteristics of an individual StormFilter system or site. It is recommended that the site owner develop a database to properly manage StormFilter inspection and maintenance programs. Prior to the development of the maintenance database, the following maintenance frequencies should be followed: Inspection One time per year After major storms Maintenance As needed, based on results of inspection (The average maintenance lifecycle is approximately 1-3 years) Per Regulatory requirement In the event of a chemical spill Frequencies should be updated as required. The recommended initial frequency for inspection is one time per year. StormFilter units should be inspected after major storms. 2 3 Maintenance Guidelines The primary purpose of the Stormwater Management StormFilter® is to filter out and prevent pollutants from entering our waterways. Like any effective filtration system, periodically these pollutants must be removed to restore the StormFilter to its full efficiency and effectiveness. Maintenance requirements and frequency are dependent on the pollutant load characteristics of each site. Maintenance activities may be required in the event of a chemical spill or due to excessive sediment loading from site erosion or extreme storms. It is a good practice to inspect the system after major storm events. Maintenance Procedures Although there are likely many effective maintenance options, we believe the following procedure is efficient and can be implemented using common equipment and existing maintenance protocols. A two step procedure is recommended as follows: 1. Inspection Inspection of the vault interior to determine the need for maintenance. 2. Maintenance Cartridge replacement Sediment removal Inspection and Maintenance Timing At least one scheduled inspection should take place per year with maintenance following as warranted. First, an inspection should be done before the winter season. During the inspection the need for maintenance should be determined and, if disposal during maintenance will be required, samples of the accumulated sediments and media should be obtained. Second, if warranted, a maintenance (replacement of the filter cartridges and removal of accumulated sediments) should be performed during periods of dry weather. 2 3 Sediment removal and cartridge replacement on an as needed basis is recommended unless site conditions warrant. Once an understanding of site characteristics has been established, maintenance may not be needed for one to three years, but inspection is warranted and recommended annually. Inspection Procedures The primary goal of an inspection is to assess the condition of the cartridges relative to the level of visual sediment loading as it relates to decreased treatment capacity. It may be desirable to conduct this inspection during a storm to observe the relative flow through the filter cartridges. If the submerged cartridges are severely plugged, then typically large amounts of sediments will be present and very little flow will be discharged from the drainage pipes. If this is the case, then maintenance is warranted and the cartridges need to be replaced. Warning: In the case of a spill, the worker should abort inspection activities until the proper guidance is obtained. Notify the local hazard control agency and CONTECH Construction Products immediately. To conduct an inspection: Important: Inspection should be performed by a person who is familiar with the operation and configuration of the StormFilter treatment unit. 1. If applicable, set up safety equipment to protect and notify surrounding vehicle and pedestrian traffic. 2. Visually inspect the external condition of the unit and take notes concerning defects/problems. 3. Open the access portals to the vault and allow the system vent. 4. Without entering the vault, visually inspect the inside of the unit, and note accumulations of liquids and solids. 5. Be sure to record the level of sediment build-up on the floor of the vault, in the forebay, and on top of the cartridges. If flow is occurring, note the flow of water per drainage pipe. Record all observations. Digital pictures are valuable for historical documentation. 6. Close and fasten the access portals. 7. Remove safety equipment. 8. If appropriate, make notes about the local drainage area relative to ongoing construction, erosion problems, or high loading of other materials to the system. 9. Discuss conditions that suggest maintenance and make decision as to weather or not maintenance is needed. Maintenance Decision Tree The need for maintenance is typically based on results of the inspection. The following Maintenance Decision Tree should be used as a general guide. (Other factors, such as Regulatory Requirements, may need to be considered) 1. Sediment loading on the vault floor. a. If >4” of accumulated sediment, maintenance is required. 2. Sediment loading on top of the cartridge. a. If >1/4” of accumulation, maintenance is required. 3. Submerged cartridges. a. If >4” of static water in the cartridge bay for more that 24 hours after end of rain event, maintenance is required. 4. Plugged media. a. If pore space between media granules is absent, maintenance is required. 5. Bypass condition. a. If inspection is conducted during an average rain fall event and StormFilter remains in bypass condition (water over the internal outlet baffle wall or submerged cartridges), maintenance is required. 6. Hazardous material release. a. If hazardous material release (automotive fluids or other) is reported, maintenance is required. 7. Pronounced scum line. a. If pronounced scum line (say ≥ 1/4” thick) is present above top cap, maintenance is required. 8. Calendar Lifecycle. a. If system has not been maintained for 3 years maintenance is required. Important: Note that cartridges containing leaf media (CSF) do not require unscrewing from their connectors. Take care not to damage the manifold connectors. This connector should remain installed in the manifold and could be capped during the maintenance activity to prevent sediments from entering the underdrain manifold. B. Remove the used cartridges (up to 250 lbs. each) from the vault. Important: Care must be used to avoid damaging the cartridges during removal and installation. The cost of repairing components damaged during maintenance will be the responsibility of the owner unless CONTECH Construction Products performs the maintenance activities and damage is not related to discharges to the system. C. Set the used cartridge aside or load onto the hauling truck. D. Continue steps a through c until all cartridges have been removed. Method 2: A. Enter the vault using appropriate confined space protocols. B. Unscrew the cartridge cap. C. Remove the cartridge hood screws (3) hood and float. D. At location under structure access, tip the cartridge on its side. 4 5 Assumptions • No rainfall for 24 hours or more • No upstream detention (at least not draining into StormFilter) • Structure is online • Outlet pipe is clear of obstruction • Construction bypass is plugged Maintenance Depending on the configuration of the particular system, maintenance personnel will be required to enter the vault to perform the maintenance. Important: If vault entry is required, OSHA rules for confined space entry must be followed. Filter cartridge replacement should occur during dry weather. It may be necessary to plug the filter inlet pipe if base flows is occurring. Replacement cartridges can be delivered to the site or customers facility. Information concerning how to obtain the replacement cartridges is available from CONTECH Construction Products. Warning: In the case of a spill, the maintenance personnel should abort maintenance activities until the proper guidance is obtained. Notify the local hazard control agency and CONTECH Construction Products immediately. To conduct cartridge replacement and sediment removal maintenance: 1. If applicable, set up safety equipment to protect maintenance personnel and pedestrians from site hazards. 2. Visually inspect the external condition of the unit and take notes concerning defects/problems. 3. Open the doors (access portals) to the vault and allow the system to vent. 4. Without entering the vault, give the inside of the unit, including components, a general condition inspection. 5. Make notes about the external and internal condition of the vault. Give particular attention to recording the level of sediment build-up on the floor of the vault, in the forebay, and on top of the internal components. 6. Using appropriate equipment offload the replacement cartridges (up to 150 lbs. each) and set aside. 7. Remove used cartridges from the vault using one of the following methods: Method 1: A. This activity will require that maintenance personnel enter the vault to remove the cartridges from the under drain manifold and place them under the vault opening for lifting (removal). Unscrew (counterclockwise rotations) each filter cartridge from the underdrain connector. Roll the loose cartridge, on edge, to a convenient spot beneath the vault access. Using appropriate hoisting equipment, attach a cable from the boom, crane, or tripod to the loose cartridge. Contact CONTECH Construction Products for suggested attachment devices. 4 5 Important: Note that cartridges containing media other than the leaf media require unscrewing from their threaded connectors. Take care not to damage the manifold connectors. This connector should remain installed in the manifold and capped if necessary. D. Empty the cartridge onto the vault floor. Reassemble the empty cartridge. E. Set the empty, used cartridge aside or load onto the hauling truck. F. Continue steps a through e until all cartridges have been removed. 8. Remove accumulated sediment from the floor of the vault and from the forebay. This can most effectively be accomplished by use of a vacuum truck. 9. Once the sediments are removed, assess the condition of the vault and the condition of the connectors. The connectors are short sections of 2-inch schedule 40 PVC, or threaded schedule 80 PVC that should protrude about 1” above the floor of the vault. Lightly wash down the vault interior. a. Replace any damaged connectors. 10. Using the vacuum truck boom, crane, or tripod, lower and install the new cartridges. Once again, take care not to damage connections. 11. Close and fasten the door. 12. Remove safety equipment. 13. Finally, dispose of the accumulated materials in accordance with applicable regulations. Make arrangements to return the used empty cartridges to CONTECH Construction Products. Related Maintenance Activities - Performed on an as-needed basis StormFilter units are often just one of many structures in a more comprehensive stormwater drainage and treatment system. In order for maintenance of the StormFilter to be successful, it is imperative that all other components be properly maintained. The maintenance/repair of upstream facilities should be carried out prior to StormFilter maintenance activities. In addition to considering upstream facilities, it is also important to correct any problems identified in the drainage area. Drainage area concerns may include: erosion problems, heavy oil loading, and discharges of inappropriate materials. Material Disposal The accumulated sediment found in stormwater treatment and conveyance systems must be handled and disposed of in accordance with regulatory protocols. It is possible for sediments to contain measurable concentrations of heavy metals and organic chemicals (such as pesticides and petroleum products). Areas with the greatest potential for high pollutant loading include industrial areas and heavily traveled roads. Sediments and water must be disposed of in accordance with all applicable waste disposal regulations. When scheduling maintenance, consideration must be made for the disposal of solid and liquid wastes. This typically requires coordination with a local landfill for solid waste disposal. For liquid waste disposal a number of options are available including a municipal vacuum truck decant facility, local waste water treatment plant or on-site treatment and discharge. 800.338.1122 www.contech-cpi.com Support • Drawings and specifications are available at contechstormwater.com. • Site-specific design support is available from our engineers. ©2009 CONTECH Construction Products Inc. CONTECH Construction Products Inc. provides site solutions for the civil engineering industry. CONTECH’s portfolio includes bridges, drainage, sanitary sewer, stormwater and earth stabilization products. For information on other CONTECH division offerings, visit contech-cpi.com or call 800.338.1122 Nothing in this catalog should be construed as an expressed warranty or an implied warranty of merchantability or fitness for any particular purpose. See the CONTECH standard quotation or acknowledgement for applicable warranties and other terms and conditions of sale. The product(s) described may be protected by one or more of the following US patents: 5,322,629; 5,624,576; 5,707,527; 5,759,415; 5,788,848; 5,985,157; 6,027,639; 6,350,374; 6,406,218; 6,641,720; 6,511,595; 6,649,048; 6,991,114; 6,998,038; 7,186,058; related foreign patents or other patents pending. Inspection Report Date: —————————————Personnel: ———————————————————————————————————— Location: ————————————System Size: ——————————————————————————————————— System Type: Vault Cast-In-Place Linear Catch Basin Manhole Other Sediment Thickness in Forebay: ——————————————————————————————————————————— Sediment Depth on Vault Floor: ——————————————————————————————————————————— Structural Damage: ———————————————————————————————————————————————— Estimated Flow from Drainage Pipes (if available): ———————————————————————————————————— Cartridges Submerged: Yes No Depth of Standing Water: —————————————————————— StormFilter Maintenance Activities (check off if done and give description) Trash and Debris Removal: ——————————————————————————————————————————— Minor Structural Repairs: ———————————————————————————————————————————— Drainage Area Report ————————————————————————————————————————————— Excessive Oil Loading: Yes No Source: ——————————————————————— Sediment Accumulation on Pavement: Yes No Source: ——————————————————————— Erosion of Landscaped Areas: Yes No Source: ——————————————————————— Items Needing Further Work: ———————————————————————————————————————————— Owners should contact the local public works department and inquire about how the department disposes of their street waste residuals. Other Comments: ————————————————————————————————————————————————————————— ————————————————————————————————————————————————————————— ————————————————————————————————————————————————————————— ————————————————————————————————————————————————————————— ————————————————————————————————————————————————————————— ————————————————————————————————————————————————————————— ————————————————————————————————————————————————————————— ————————————————————————————————————————————————————————— Date: Review the condition reports from the previous inspection visits. StormFilter Maintenance Report Date: —————————————Personnel: ———————————————————————————————————— Location: ————————————System Size: ——————————————————————————————————— System Type: Vault Cast-In-Place Linear Catch Basin Manhole Other List Safety Procedures and Equipment Used: —————————————————————————————————————— ————————————————————————————————————————————————————————— ————————————————————————————————————————————————————————— System Observations Months in Service: Oil in Forebay: Yes No Sediment Depth in Forebay: ————————————————————————————————————————————— Sediment Depth on Vault Floor: ——————————————————————————————————————————— Structural Damage: ———————————————————————————————————————————————— Drainage Area Report Excessive Oil Loading: Yes No Source: ————————————————————————— Sediment Accumulation on Pavement: Yes No Source: ————————————————————————— Erosion of Landscaped Areas: Yes No Source: ————————————————————————— StormFilter Cartridge Replacement Maintenance Activities Remove Trash and Debris: Yes No Details: —————————————————————————— Replace Cartridges: Yes No Details: —————————————————————————— Sediment Removed: Yes No Details: —————————————————————————— Quantity of Sediment Removed (estimate?): Minor Structural Repairs: Yes No Details: ————————————————————————— Residuals (debris, sediment) Disposal Methods: —————————————————————————————————————— Notes: —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— Design Manual StormTech®Chamber Systems for Stormwater Management S C -3 1 0 / S C -7 4 0 / D C -7 8 0 12.0 Inspection and Maintenance Call StormTech at 860.529.8188 or 888.892.2694 or visit our website at www.stormtech.com for technical and product information.22 12.1 ISOLATOR ROW INSPECTION Regular inspection and maintenance are essential to assure a properly functioning stormwater system. Inspec tion is easily accomplished through the manhole or optional inspection ports of an Isolator Row. Please follow local and OSHA rules for a confined space entry. Inspection ports can allow inspection to be accomplished completely from the surface without the need for a con- fined space entry. Inspection ports provide visual access to the system with the use of a flashlight. A stadia rod may be inserted to determine the depth of sediment. If upon visual inspection it is found that sediment has accumulated to an average depth exceeding 3" (76 mm), cleanout is required. A StormTech Isolator Row should initially be inspected immediately after completion of the site’s construction. While every effort should be made to prevent sediment from entering the system during construction, it is during this time that excess amounts of sediments are most likely to enter any stormwater system. Inspection and maintenance, if necessary, should be performed prior to passing responsibility over to the site’s owner. Once in normal service, a StormTech Isolator Row should be inspected bi-annually until an understanding of the sites characteristics is developed. The site’s maintenance manager can then revise the inspection schedule based on experience or local requirements. 12.2 ISOLATOR ROW MAINTENANCE JetVac maintenance is recommended if sediment has been collected to an average depth of 3" (76 mm) inside the Isolator Row. More frequent maintenance may be required to maintain minimum flow rates through the Isolator Row. The JetVac process utilizes a high pressure water nozzle to propel itself down the Isolator Row while scouring and suspending sediments. As the nozzle is retrieved, a wave of suspended sediments is flushed back into the manhole for vacuuming. Most sewer and pipe maintenance companies have vacuum/ JetVac combi- nation vehicles. Fixed nozzles designed for culverts or large dia meter pipe cleaning are preferable. Rear facing jets with an effective spread of at least 45" (1143 mm) are best. The JetVac process shall only be performed on StormTech Rows that have AASHTO class 1 woven geotextile over the foundation stone (ADS 315ST or equal). Looking down the Isolator Row. A typical JetVac truck. (This is not a StormTech product.) Examples of culvert cleaning nozzles appropriate for Isolator Row maintenance. (These are not StormTech products.) 23 Call StormTech at 860.529.8188 or 888.892.2694 or visit our website at www.stormtech.com for technical and product information. 12.0 Inspection & Maintenance STORMTECH ISOLATOR™ROW - STEP-BY-STEP MAINTENANCE PROCEDURES Step 1)Inspect Isolator Row for sediment A) Inspection ports (if present) i. Remove lid from floor box frame ii. Remove cap from inspection riser iii. Using a flashlight and stadia rod, measure depth of sediment iv. If sediment is at, or above, 3" (76 mm) depth proceed to Step 2. If not proceed to Step 3. B) All Isolator Rows i. Remove cover from manhole at upstream end of Isolator Row ii. Using a flashlight, inspect down Isolator Row through outlet pipe 1. Follow OSHA regulations for confined space entry if entering manhole 2. Mirrors on poles or cameras may be used to avoid a confined space entry iii. If sediment is at or above the lower row of sidewall holes [approximately 3" (76 mm)] proceed to Step 2. If not proceed to Step 3. Step 2)Clean out Isolator Row using the JetVac process A) A fixed floor cleaning nozzle with rear facing nozzle spread of 45" (1143 mm) or more is preferable B) Apply multiple passes of JetVac until back- flush water is clean C) Vacuum manhole sump as required during jetting Step 3) Replace all caps, lids and covers Step 4)Inspect and clean catch basins and manholes upstream of the StormTech system following local guidelines. 4 21) B)1) A) Figure 20 –StormTech Isolator Row (not to scale) Please contact StormTech’s Technical Services Department at 888-892-2894 for a spreadsheet to estimate cleaning intervals. 12.3 ECCENTRIC PIPE HEADER INSPECTION Theses guidelines do not supercede a pipe manufac- turer’s recommended I&M procedures. Consult with the manufacturer of the pipe header system for specific I&M procedures. Inspection of the header system should be carried out quarterly. On sites which generate higher levels of sediment more frequent inspections may be necessary. Headers may be accessed through risers, access ports or manholes. Measurement of sediment may be taken with a stadia rod or similar device. Clean - out of sediment should occur when the sediment volume has reduced the storage area by 25% or the depth of sediment has reached approximately 25% of the diameter of the structure. 12.4 ECCENTRIC PIPE MANIFOLD MAINTENANCE Cleanout of accumulated material should be accom- plished by vacuum pumping the material from the head- er. Cleanout should be accomplished during dry weath- er. Care should be taken to avoid flushing sediments out through the outlet pipes and into the chamber rows. Eccentric Header Step-by-Step Maintenance Procedures 1.Locate manholes connected to the manifold system 2.Remove grates or covers 3.Using a stadia rod, measure the depth of sediment 4.If sediment is at a depth of about 25% pipe volume or 25% pipe diameter proceed to step 5. If not proceed to step 6. 5.Vacuum pump the sediment. Do not flush sediment out inlet pipes. 6.Replace grates and covers 7.Record depth and date and schedule next inspection 1, 2, 6 3, 4, 5 Figure 21 –Eccentric Manifold Maintenance StormFilter Maintenance Guidelines Maintenance requirements and frequency are dependent on the pollutant load characteristics of each site, and may be required in the event of a chemical spill or due to excessive sediment loading. Maintenance Procedures Although there are other effective maintenance options, CONTECH recommends the following two step procedure: 1. Inspection: Determine the need for maintenance. 2. Maintenance: Cartridge replacement and sediment removal. Inspection and Maintenance Activity Timing At least one scheduled inspection activity should take place per year with maintenance following as warranted. First, inspection should be done before the winter season. During which, the need for maintenance should be determined and, if disposal during maintenance will be required, samples of the accumulated sediments and media should be obtained. Second, if warranted, maintenance should be performed during periods of dry weather. In addition, you should check the condition of the StormFilter unit after major storms for potential damage caused by high flows and for high sediment accumulation. It may be necessary to adjust the inspection/maintenance activity schedule depending on the actual operating conditions encountered by the system. Generally, inspection activities can be conducted at any time, and maintenance should occur when flows into the system are unlikely. Maintenance Activity Frequency Maintenance is performed on an as needed basis, based on inspection. Average maintenance lifecycle is 1-3 years. The primary factor controlling timing of maintenance of the StormFilter is sediment loading. Until appropriate timeline is determined, use the following: Inspection: One time per year After major storms Maintenance: As needed Per regulatory requirement In the event of a chemical spill Inspection Procedures It is desirable to inspect during a storm to observe the relative flow through the filter cartridges. If the submerged cartridges are severely plugged, then typically large amounts of sediments will be present and very little flow will be discharged from the drainage pipes. If this is the case, then maintenance is warranted and the cartridges need to be replaced. Warning: In the case of a spill, the worker should abort inspection activities until the proper guidance is obtained. Notify the local hazard control agency and CONTECH immediately. To conduct an inspection: Important: Inspection should be performed by a person who is familiar with the StormFilter treatment unit. 1. If applicable, set up safety equipment to protect and notify surrounding vehicle and pedestrian traffic. 2. Visually inspect the external condition of the unit and take notes concerning defects/problems. 3. Open the access portals to the vault and allow the system vent. 4. Without entering the vault, visually inspect the inside of the unit, and note accumulations of liquids and solids. 5. Be sure to record the level of sediment build-up on the floor of the vault, in the forebay, and on top of the cartridges. If flow is occurring, note the flow of water per drainage pipe. Record all observations. Digital pictures are valuable for historical documentation. 6. Close and fasten the access portals. 7. Remove safety equipment. 8. If appropriate, make notes about the local drainage area relative to ongoing construction, erosion problems, or high loading of other materials to the system. 9. Discuss conditions that suggest maintenance and make decision as to weather or not maintenance is needed. Maintenance Decision Tree The need for maintenance is typically based on results of the inspection. Use the following as a general guide. (Other factors, such as regulatory requirements, may need to be considered) 1. Sediment loading on the vault floor. If >4” of accumulated sediment, then go to maintenance. 2. Sediment loading on top of the cartridge. If >1/4” of accumulation, then go to maintenance. 3. Submerged cartridges. If >4” of static water in the cartridge bay for more that 24 hrs after end of rain event, then go to maintenance. 4. Plugged media. If pore space between media granules is absent, then go to maintenance. 5. Bypass condition. If inspection is conducted during an average rain fall event and StormFilter remains in bypass condition (water over the internal outlet baffle wall or submerged cartridges), then go to maintenance. 6. Hazardous material release. If hazardous material release (automotive fluids or other) is reported, then go to maintenance. 7. Pronounced scum line. If pronounced scum line (say ≥ 1/4” thick) is present above top cap, then go to maintenance. 8. Calendar Lifecycle. If system has not been maintained for 3 years, then go to maintenance. Assumptions: No rainfall for 24 hours or more. No upstream detention (at least not draining into StormFilter). Structure is online. Outlet pipe is clear of obstruction. Construction bypass is plugged. Maintenance Depending on the configuration of the particular system, workers will be required to enter the vault to perform the maintenance. 1 Important: If vault entry is required, OSHA rules for confined space entry must be followed. Filter cartridge replacement should occur during dry weather. It may be necessary to plug the filter inlet pipe if base flow is occurring. Replacement cartridges can be delivered to the site or customers facility. Contact CONTECH for more information. Warning: In the case of a spill, the worker should abort maintenance activities until the proper guidance is obtained. Notify the local hazard control agency and CONTECH immediately. To conduct cartridge replacement and sediment removal: 1. If applicable, set up safety equipment to protect workers and pedestrians from site hazards. 2. Visually inspect the external condition of the unit and take notes concerning defects/problems. 3. Open the doors (access portals) to the vault and allow the system to vent. 4. Without entering the vault, give the inside of the unit, including components, a general condition inspection. 5. Make notes about the external and internal condition of the vault. Give particular attention to recording the level of sediment build-up on the floor of the vault, in the forebay, and on top of the internal components. 6. Using appropriate equipment offload the replacement cartridges (up to 150 lbs. each) and set aside. 7. Remove used cartridges from the vault using one of the following methods: Method 1: A. This activity will require that workers enter the vault to remove the cartridges from the under drain manifold and place them under the vault opening for lifting (removal). Unscrew (counterclockwise rotations) each filter cartridge from the underdrain connector. Roll the loose cartridge, on edge, to a convenient spot beneath the vault access. Using appropriate hoisting equipment, attach a cable from the boom, crane, or tripod to the loose cartridge. Contact CONTECH for suggested attachment devices. Important: Cartridges containing leaf media (CSF) do not require unscrewing from their connectors. Do not damage the manifold connectors. They should remain installed in the manifold and can be capped during the maintenance activity to prevent sediments from entering the under drain manifold. B. Remove the used cartridges (up to 250 lbs.) from the vault. Important: Avoid damaging the cartridges during removal and installation. C. Set the used cartridge aside or load onto the hauling truck. D. Continue steps A through C until all cartridges have been removed. Method 2: A. Enter the vault using appropriate confined space protocols. B. Unscrew the cartridge cap. C. Remove the cartridge hood screws (3) hood and float. D. At location under structure access, tip the cartridge on its side. Important: Note that cartridges containing media other than the leaf media require unscrewing from their threaded connectors. Take care not to damage the manifold connectors. This connector should remain installed in the manifold and capped if necessary. E. Empty the cartridge onto the vault floor. Reassemble the empty cartridge. F. Set the empty, used cartridge aside or load onto the hauling truck. G. Continue steps a through E until all cartridges have been removed. 8. Remove accumulated sediment from the floor of the vault and from the forebay. Use vacuum truck for highest effectiveness. 9. Once the sediments are removed, assess the condition of the vault and the connectors. The connectors are short sections of 2-inch schedule 40 PVC, or threaded schedule 80 PVC that should protrude about 1” above the floor of the vault. Lightly wash down the vault interior. a. Replace any damaged connectors. 10. Using the vacuum truck boom, crane, or tripod, lower and install the new cartridges. Take care not to damage connections. 11. Close and fasten the door. 12. Remove safety equipment. 13. Finally, dispose of the accumulated materials in accordance with applicable regulations. Make arrangements to return the used empty cartridges to CONTECH. Material Disposal The accumulated sediment must be handled and disposed of in accordance with regulatory protocols. It is possible for sediments to contain measurable concentrations of heavy metals and organic chemicals. Areas with the greatest potential for high pollutant loading include industrial areas and heavily traveled roads. Sediments and water must be disposed of in accordance with applicable waste disposal regulations. Coordinate disposal of solids and liquids as part of your maintenance procedure. Contact the local public works department to inquire how they disposes of their street waste residuals. 2 800.338.1122 www.contech-cpi.com©2007 CONTECH Stormwater Solutions Nothing in this catalog should be construed as an expressed warranty or an implied warranty of merchantability or fitness for any particular purpose. See the CONTECH standard quotation or acknowledgement for applicable warranties and other terms and conditions of sale. The product(s) described may be protected by one or more of the following US patents: 5,322,629; 5,624,576; 5,707,527; 5,759,415; 5,788,848; 5,985,157; 6,027,639; 6,350,374; 6,406,218; 6,641,720; 6,511,595; 6,649,048; 6,991,114; 6,998,038; 7,186,058; related foreign patents or other patents pending.e trademarks, registered trademarks, or licensed trademarks of CONTECH Construction Products Inc. CDS® Inspection and Maintenance Guide Maintenance The CDS system should be inspected at regular intervals and maintained when necessary to ensure optimum performance. The rate at which the system collects pollutants will depend more heavily on site activities than the size of the unit. For example, unstable soils or heavy winter sanding will cause the grit chamber to fill more quickly but regular sweeping of paved surfaces will slow accumulation. Inspection Inspection is the key to effective maintenance and is easily performed. Pollutant transport and deposition may vary from year to year and regular inspections will help ensure that the system is cleaned out at the appropriate time. At a minimum, inspections should be performed twice per year (e.g. spring and fall) however more frequent inspections may be necessary in climates where winter sanding operations may lead to rapid accumulations, or in equipment washdown areas. Installations should also be inspected more frequently where excessive amounts of trash are expected. The visual inspection should ascertain that the system components are in working order and that there are no blockages or obstructions in the inlet and separation screen. The inspection should also quantify the accumulation of hydrocarbons, trash, and sediment in the system. Measuring pollutant accumulation can be done with a calibrated dipstick, tape measure or other measuring instrument. If absorbent material is used for enhanced removal of hydrocarbons, the level of discoloration of the sorbent material should also be identified during inspection. It is useful and often required as part of an operating permit to keep a record of each inspection. A simple form for doing so is provided. Access to the CDS unit is typically achieved through two manhole access covers. One opening allows for inspection and cleanout of the separation chamber (cylinder and screen) and isolated sump. The other allows for inspection and cleanout of sediment captured and retained outside the screen. For deep units, a single manhole access point would allows both sump cleanout and access outside the screen. The CDS system should be cleaned when the level of sediment has reached 75% of capacity in the isolated sump or when an appreciable level of hydrocarbons and trash has accumulated. If absorbent material is used, it should be replaced when significant discoloration has occurred. Performance will not be impacted until 100% of the sump capacity is exceeded however it is recommended that the system be cleaned prior to that for easier removal of sediment. The level of sediment is easily determined by measuring from finished grade down to the top of the sediment pile. To avoid underestimating the level of sediment in the chamber, the measuring device must be lowered to the top of the sediment pile carefully. Particles at the top of the pile typically offer less resistance to the end of the rod than consolidated particles toward the bottom of the pile. Once this measurement is recorded, it should be compared to the as-built drawing for the unit to determine weather the height of the sediment pile off the bottom of the sump floor exceeds 75% of the total height of isolated sump. Cleaning Cleaning of a CDS systems should be done during dry weather conditions when no flow is entering the system. The use of a vacuum truck is generally the most effective and convenient method of removing pollutants from the system. Simply remove the manhole covers and insert the vacuum hose into the sump. The system should be completely drained down and the sump fully evacuated of sediment. The area outside the screen should also be cleaned out if pollutant build-up exists in this area. In installations where the risk of petroleum spills is small, liquid contaminants may not accumulate as quickly as sediment. However, the system should be cleaned out immediately in the event of an oil or gasoline spill should be cleaned out immediately. Motor oil and other hydrocarbons that accumulate on a more routine basis should be removed when an appreciable layer has been captured. To remove these pollutants, it may be preferable to use absorbent pads since they are usually less expensive to dispose than the oil/water emulsion that may be created by vacuuming the oily layer. Trash and debris can be netted out to separate it from the other pollutants. The screen should be power washed to ensure it is free of trash and debris. Manhole covers should be securely seated following cleaning activities to prevent leakage of runoff into the system from above and also to ensure that proper safety precautions have been followed. Confined space entry procedures need to be followed if physical access is required. Disposal of all material removed from the CDS system should be done in accordance with local regulations. In many jurisdictions, disposal of the sediments may be handled in the same manner as the disposal of sediments removed from catch basins or deep sump manholes. CDS Diameter Distance from Water Surface Sediment Model to Top of Sediment Pile Storage Capacity ft m ft m yd3 m3 CDS2015-4 4 1.2 3.0 0.9 0.5 0.4 CDS2015 5 1.5 3.0 0.9 1.3 1.0 CDS2020 5 1.5 3.5 1.1 1.3 1.0 CDS2025 5 1.5 4.0 1.2 1.3 1.0 CDS3020 6 1.8 4.0 1.2 2.1 1.6 CDS3030 6 1.8 4.6 1.4 2.1 1.6 CDS3035 6 1.8 5.0 1.5 2.1 1.6 CDS4030 8 2.4 4.6 1.4 5.6 4.3 CDS4040 8 2.4 5.7 1.7 5.6 4.3 CDS4045 8 2.4 6.2 1.9 5.6 4.3 Table 1: CDS Maintenance Indicators and Sediment Storage Capacities 800.925.5240 contechstormwater.com Support • Drawings and specifications are available at www.contechstormwater.com. • Site-specific design support is available from our engineers. ©2010 CONTECH Stormwater Solutions CONTECH Construction Products Inc. provides site solutions for the civil engineering industry. CONTECH’s portfolio includes bridges, drainage, sanitary sewer, stormwater and earth stabilization products. For information on other CONTECH division offerings, visit contech- cpi.com or call 800.338.1122 Nothing in this catalog should be construed as an expressed warranty or an implied warranty of merchantability or fitness for any particular purpose. See the CONTECH standard quotation or acknowledgement for applicable warranties and other terms and conditions of sale. The product(s) described may be protected by one or more of the following US patents: 5,322,629; 5,624,576; 5,707,527; 5,759,415; 5,788,848; 5,985,157; 6,027,639; 6,350,374; 6,406,218; 6,641,720; 6,511,595; 6,649,048; 6,991,114; 6,998,038; 7,186,058; 7,296,692; 7,297,266; 7,517,450 related foreign patents or other patents pending. cdsMaintenance 01/10 CDS Inspection & Maintenance Log CDS Model: Location: Water Floatable Describe Maintenance Date depth to Layer Maintenance Personnel Comments sediment1 Thickness2 Performed —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— —————————————————————————————————————————————————————————— 1. The water depth to sediment is determined by taking two measurements with a stadia rod: one measurement from the manhole opening to the top of the sediment pile and the other from the manhole opening to the water surface. If the difference between these measurements is less than eighteen inches the system should be cleaned out. Note: To avoid underestimating the volume of sediment in the chamber, the measuring device must be carefully lowered to the top of the sediment pile. 2. For optimum performance, the system should be cleaned out when the floating hydrocarbon layer accumulates to an appreciable thickness. In the event of an oil spill, the system should be cleaned immediately. Isolator™Row O&M Manual StormTech®Chamber System for Stormwater Management 1.1INTRODUCTION An important component of any Stormwater Pollution Prevention Plan is inspection and maintenance. The StormTech Isolator Row is a patent pending technique to inexpensively enhance Total Suspended Solids (TSS) removal and provide easy access for inspection and maintenance. 1.2THE ISOLATOR™ROW The Isolator Row is a row of StormTech chambers, either SC-740 or SC-310 models, that is surrounded with filter fabric and connected to a closely located manhole for easy access. The fabric-wrapped chambers provide for settling and filtration of sediment as storm water rises in the Isolator Row and ultimately passes through the filter fabric. The open bottom chambers and perforated side- walls allow storm water to flow both vertically and horizon- tally out of the chambers. Sediments are captured in the Isolator Row protecting the storage areas of the adja- cent stone and chambers from sediment accumulation. Two different fabrics are used for the Isolator Row. A woven geotextile fabric is placed between the stone and the Isolator Row chambers. The tough geotextile provides a media for storm water filtration and provides a durable surface for maintenance operations. It is also designed to prevent scour of the underlying stone and remain intact during high pressure jetting. A non-woven fabric is placed over the chambers to provide a filter media for flows passing through the perforations in the sidewall of the chamber. 2 Call StormTech at 888.892.2694 or visit our website at www.stormtech.com for technical and product information. 1.0 The Isolator™Row The Isolator Row is typically designed to capture the “first flush” and offers the versatility to be sized on a vol- ume basis or flow rate basis. An upstream manhole not only provides access to the Isolator Row but typically includes a high flow weir such that storm water flowrates or volumes that exceed the capacity of the Isolator Row overtop the over flow weir and discharge through a manifold to the other chambers. The Isolator Row may also be part of a treatment train. By treating storm water prior to entry into the chamber system, the service life can be extended and pollutants such as hydrocarbons can be captured. Pre-treatment best management practices can be as simple as deep sump catch basins, oil-water separators or can be inno- vative storm water treatment devices. The design of the treatment train and selection of pretreatment devices by the design engineer is often driven by regulatory requirements. Whether pretreatment is used or not, the Isolator Row is recommended by StormTech as an effective means to minimize maintenance requirements and maintenance costs. Note: See the StormTech Design Manual for detailed information on designing inlets for a StormTech system, including the Isolator Row. ECCENTRIC HEADER MANHOLE WITH OVERFLOW WEIR STORMTECH ISOLATOR ROW OPTIONAL PRE-TREATMENT OPTIONAL ACCESS STORMTECH CHAMBERS StormTech Isolator Row with Overflow Spillway (not to scale) Looking down the Isolator Row from the manhole opening, woven geotextile is shown between the chamber and stone base. 2.0 Isolator Row Inspection/Maintenance Call StormTech at 888.892.2694 or visit our website at www.stormtech.com for technical and product information. 3 Maintenance is accomplished with the JetVac process. The JetVac process utilizes a high pressure water noz- zle to propel itself down the Isolator Row while scouring and suspending sediments. As the nozzle is retrieved, the captured pollutants are flushed back into the man- hole for vacuuming. Most sewer and pipe maintenance companies have vacuum/JetVac combination vehicles. Selection of an appropriate JetVac nozzle will improve maintenance efficiency. Fixed nozzles designed for cul- verts or large diameter pipe cleaning are preferable. Rear facing jets with an effective spread of at least 45” are best. Most JetVac reels have 400 feet of hose allow- ing maintenance of an Isolator Row up to 50 chambers long. The JetVac process shall only be performed on StormTech Isolator Rows that have AASHTO class 1 woven geotextile (as specified by StormTech) over their angular base stone. 2.1INSPECTION The frequency of Inspection and Maintenance varies by location. A routine inspection schedule needs to be established for each individual location based upon site specific variables. The type of land use (i.e. industrial, commercial residential), anticipated pollutant load, per- cent imperviousness, climate, etc. all play a critical role in determining the actual frequency of inspection and maintenance practices. At a minimum, StormTech recommends annual inspec- tions. Initially, the Isolator Row should be inspected every 6 months for the first year of operation. For subsequent years, the inspection should be adjusted based upon previous observation of sediment deposition. The Isolator Row incorporates a combination of standard manhole(s) and strategically located inspection ports (as needed). The inspection ports allow for easy access to the system from the surface, eliminating the need to perform a confined space entry for inspection purposes. If upon visual inspection it is found that sediment has accumulated, a stadia rod should be inserted to deter- mine the depth of sediment. When the average depth of sediment exceeds 3 inches throughout the length of the Isolator Row, clean-out should be performed. 2.2 MAINTENANCE The Isolator Row was designed to reduce the cost of periodic maintenance. By “isolating” sediments to just one row, costs are dramatically reduced by eliminating the need to clean out each row of the entire storage bed. If inspection indicates the potential need for main- tenance, access is provided via a manhole(s) located on the end(s) of the row for cleanout. If entry into the manhole is required, please follow local and OSHA rules for a confined space entries. 2FT MIN. SUMP COVER ENTIRE ROW WITH AASHTO M288 CLASS 2 NON-WOVEN GEOTEXTILE SC-740 — 8' WIDE STRIP SC-310 — 5' WIDE STRIP STORMTECH ENDCAP INSPECTION PORT LOCATION PER ENGINEER'S DRAWING CATCH BASIN OR MANHOLE 12" MIN ID 25" MAX OD PIPE SET 1.5" FROM BOTTOM OF CHAMBER WOVEN GEOTEXTILE THAT MEETS AASHTO M288 CLASS 1 REQUIREMENTS, BETWEEN STONE BASE AND CHAMBERS SC-740 — 5'-6' WIDE STRIP SC-310 — 4' WIDE STRIP StormTech Isolator Row (not to scale) Examples of culvert cleaning nozzles appropriate for Isolator Row maintenance. (These are not StormTech products.) Step 1)Inspect Isolator Row for sediment A) Inspection ports (if present) i.Remove lid from floor box frame ii.Remove cap from inspection riser iii.Using a flashlight and stadia rod, measure depth of sediment and record results on maintenance log. iv.If sediment is at, or above, 3 inch depth proceed to Step 2. If not proceed to step 3. B) All Isolator Rows i.Remove cover from manhole at upstream end of Isolator Row ii.Using a flashlight, inspect down Isolator Row through outlet pipe 1.Mirrors on poles or cameras may be used to avoid a confined space entry 2.Follow OSHA regulations for confined space entry if entering manhole iii.If sediment is at or above the lower row of sidewall holes (approximately 3 inches) proceed to Step 2. If not proceed to Step 3. Step 2)Clean out Isolator Row using the JetVac process A) A fixed culvert cleaning nozzle with rear facing nozzle spread of 45 inches or more is preferable B) Apply multiple passes of JetVac until backflush water is clean C) Vacuum manhole sump as required Step 3) Replace all caps, lids and covers, record observations and actions Step 4)Inspect & clean catch basins and manholes upstream of the StormTech system StormTech products are covered by one or more of the following patents: U.S. Patents: 5,401,459; 5,511,903; 5,716,163; 5,588,778; 5,839,844; Canadian Patents: 2,158,418 Other U.S. and Foreign Patents PendingPrinted in U.S.A. © Copyright. All rights reserved. StormTech LLC, 2004 S090104-1 3.0 Isolator Row Step By Step Maintenance Procedures 4 21) B)1) A) StormTech Isolator Row (not to scale) Stadia Rod Readings Fixed pointFixed point Sediment Date to chamberto top of DepthObservations/ActionsInspector bottom (1)sediment (2)(1) - (2) 3/15/016.3 ft.noneNew installation. Fixed point is Cl frame at gradedjm 9/24/016.20.1 ft.Some grit feltsm 6/20/035.80.5 ft.Mucky feel, debris visible in manhole and inrv Isolator row, maintenance due 7/7/036.3 ft.0System jetted and vacuumeddjm Sample Maintenance Log 20 Beaver Road, Suite 104 Wethersfield Connecticut 06109 860.529.8188 888.892.2694 fax 866.328.8401www.stormtech.com APPENDIX A Emergency Response Plan EMERGENCY RESPONSE PLAN BUTCHER BOY MARKETPLACE 1077 OSGOOD STREET NORTH ANDOVER, MASSACHUSETTS Prepared For: Angus Realty Corporation 1077 Osgood Street North Andover, Massachusetts 01845 Prepared By: Lynnfield Engineering, Inc. 199 Newbury Street, Suite 115 Danvers, Massachusetts 01923 September 16, 2013 -i- K:\480-60\Reports\091613_Emergency Response Plan\toc.doc TABLE OF CONTENTS EMERGENCY CONTACTS SECTION 1: INTRODUCTION 1 1.1 Purpose 1 SECTION 2: GENERAL FACILITY INFORMATION 3 2.1 Facility Description (40 CFR 112.7(a)(3)) 2.1.1 Location and Activities 3 3 SECTION 3: DISCHARGE RESPONSE 5 3.1 Response to a Minor Discharge 3.2 Response to a Major Discharge 3.3 Waste Disposal 3.4 Discharge Notification 3.5 Cleanup Contractors and Equipment Suppliers 6 7 8 8 9 TABLES 1 Emergency Contacts 5 APPENDICES A Discharge Notification Form and Agency Notification Standard Report -ii- K:\480-60\Reports\091613_Emergency Response Plan\toc.doc This page has intentionally been left blank. K:\480-60\Reports\091613_Emergency Response Plan\tab_emergency contacts.doc EMERGENCY CONTACTS Designated person responsible for emergency response: Facility Response Coordinator – Alan Yameen 978.688.1511 General Manager – Dave Barry 978.688.1511 EMERGENCY TELEPHONE NUMBERS: Town of North Andover Fire Department 978.688.9590 or 911 Town of North Andover Water & Sewer Department 978.685.0950 Massachusetts State Police (Andover Barracks) 978.475.3800 MADEP Emergency Response Center 888.304.1133 MADEP Oil Remediation and Compliance Bureau 888.304.1133 National Response Center (U.S. Coast Guard) 800.424.8802 MADEP 617.292.5500 USEPA, Region 1 617.223.7265 Local Hospital: Lawrence General Hospital 1 General Street Lawrence, MA 01842 978.683.4000 or 911 Poison Control Center 800.442.6305 Emergency Response Contractors: CYN Environmental Services, Inc. 800.622.6365 ENPRO Services, Inc. 800.966.1102 CHEMTREC Emergency 800.424.9300 K:\480-60\Reports\091613_Emergency Response Plan\tab_emergency contacts.doc This page has intentionally been left blank. -1- K:\480-60\Reports\091613_Emergency Response Plan\txt.doc SECTION 1 INTRODUCTION 1.1 The purpose of this Emergency Response Plan (ERP) is to describe measures to be implemented at the Butcher Boy Marketplace to prevent oil or hazardous material discharges from occurring, and to prepare Butcher Boy Marketplace to respond in a safe, effective, and timely manner to mitigate the impacts of a discharge. PURPOSE This ERP Plan is used as a tool to communicate practices on preventing and responding to discharges with employees, as a guide to facility inspections, and as a resource during emergency response. -2- K:\480-60\Reports\091613_Emergency Response Plan\txt.doc This page has intentionally been left blank. -3- K:\480-60\Reports\091613_Emergency Response Plan\txt.doc SECTION 2 GENERAL FACILITY INFORMATION Name: Butcher Boy Marketplace Address: 1077 Osgood Street North Andover, Massachusetts 01845 978.688.1511 Type: Retail Shopping Mall Owner/Operator: Angus Realty 1077 Osgood Street North Andover, Massachusetts 01845 Primary contact: Alan Yameen, Facility Response Coordinator 978.688.1511 2.1 2.1.1 FACILITY DESCRIPTION (40 CFR 112.7(A)(3)) Location and Activities The Angus Realty Corporation site consists of an approximate 9 acre site occupied by a 29,934 square foot (SF) retail building and associated parking lot areas. The parcel is zoned General Business District per the Zoning Bylaw Town of North Andover last amended May 2004. The site is bound northerly by residential property; easterly by underdeveloped woodlands, and a residential home; southerly by Great Pond Road (State Route 133), and Lake Cochichewick; and, westerly by Osgood Street (State Route 125). The site is occupied by Butcher Boy Marketplace, a retail mall, and associated parking lot areas. The site is located within the Zone A to the Town’s Public Water Supply Lake Cochichewick. -4- K:\480-60\Reports\091613_Emergency Response Plan\txt.doc This page has intentionally been left blank. -5- K:\480-60\Reports\091613_Emergency Response Plan\txt.doc SECTION 3 DISCHARGE RESPONSE The uncontrolled discharge of oil to groundwater, surface water, or soil is prohibited by State and possibly federal laws. Immediate action must be taken to control, contain, and recover discharged product. In general, the following steps are taken: • Eliminate potential spark sources; • If possible and safe to do so, identify and shut down source of the discharge to stop the flow; • Contain the discharge with sorbents, berms, fences, trenches, sandbags, or other material; • Plug drain pipes downgradient from the spill to contain spilled material; • Contact the Facility Response Coordinator or his alternate; • Contact regulatory authorities and the response organization; and, • Collect and dispose of recovered products according to regulation. For the purpose of establishing appropriate response procedures, this ERP Plan classifies discharges as either “minor” or “major,” depending on the volume and characteristics of the material released. Table No. 1 presents a list of Emergency Contacts. The list should be posted at prominent locations throughout the facility. If material is released outside the containment areas, it is critical that the material is accurately identified and appropriate control measures are taken in the safest possible manner. Consult the MSDSs file in the Facility office. TABLE No. 1: Emergency Contacts Designated person responsible for emergency response activities: Facility Response Coordinator – Alan Yameen 978.688.1511 General Manager – Dave Barry 978.688.1511 EMERGENCY TELEPHONE NUMBERS: Town of North Andover Fire Department 978.688.9590 or 911 Town of North Andover Water & Sewer Department 978.685.0950 Massachusetts State Police (Andover Barracks) 978.475.3800 -6- K:\480-60\Reports\091613_Emergency Response Plan\txt.doc MassDEP Emergency Response Center 888.304.1133 MassDEP Oil Remediation and Compliance Bureau 888.304.1133 National Response Center (U.S. Coast Guard) 800.424.8802 MassDEP 617.292.5000 USEPA, Region 1 617.223.7265 Local Hospital: Lawrence General Hospital 1 General Street Lawrence, MA 01842 978.683.4000 or 911 Poison Control Center 800.442.6305 Emergency Response Contractor: CYN Environmental Services, Inc. 800.622.6365 ENPRO Services, Inc. 800.966.1102 CHEMTREC Emergency 800.424.9300 3.1 A “minor” discharge is defined as one that poses no significant harm (or threat) to human health and safety or to the environment. Minor discharges are generally those where: RESPONSE TO A MINOR DISCHARGE • The quantity of product discharged is small (e.g., may i nvolve less than 10 gallons of oil or gasoline); • Discharged material is easily stopped and controlled at the time of the discharge; • Discharge is localized near the source; • Discharged material is not likely to reach water; • There is little risk to human health or safety; and, • There is little risk of fire or explosion. Minor discharges can usually be cleaned up by Butcher Boy Marketplace personnel. The following guidelines apply: • Immediately notify the Facility Response Coordinator; • Under the direction of the Facility Response Coordinator, contain the discharge with discharge response materials and equipment. Place discharge debris in properly labeled waste containers; -7- K:\480-60\Reports\091613_Emergency Response Plan\txt.doc • Inspect stormwater management system catch basins, manholes and Stormceptor units to insure they are free of debris and/or contaminants; • Cleaning of the Stormceptor units shall be completed in accordance with the manufacturer’s recommendations. Refer to Owner’s Manual presented in the Inspection and Maintenance Plan; • The Facility Response Coordinator will complete the Discharge Notification Form presented in Appendix A; and, • If the discharge involves more than 10 gallons of gasoline or diesel fuel, the Facility Response Coordinator will notify the MassDEP Emergency Response Center at 888.304.1133. 3.2 RESPONSE TO A MAJOR DISCHARGE A “major” discharge is defined as one that cannot be safely controlled or cleaned up by facility personnel, such as when: • The discharge is large enough to spread beyond the immediate discharge area; • The discharged material enters water; • The discharge requires special equipment or training to clean up; • The discharged material poses a hazard to human health or safety; or, • There is a danger of fire or explosion. In the event of a major discharge, the following guidelines apply: • All workers must immediately evacuate the discharge site via the designated exit routes and move to the designated staging areas at a safe distance from the discharge. Exit routes are included on the facility diagram and posted in the maintenance building, in the office building, and on the outside wall of the outside shed that contains the spill response equipment; • If the Facility Response Coordinator is not present at the facility, the senior on- site person notifies the Facility Response Coordinator of the discharge and has authority to initiate notification and response. Certain notifications are dependent on the circumstances and type of discharge. If a discharge reaches a sanitary sewer, the publicly owned treatment works (POTW) will be notified immediately. A discharge that threatens Lake Cochichewick will require immediate notification to the Town Department of Public Works; • The Facility Response Coordinator (or senior on-site person) must call for medical assistance if workers are injured; • The Facility Response Coordinator (or senior on-site person) must notify the Fire Department or Police Department; • The Facility Response Coordinator (or senior on-site person) must call the spill response and cleanup contractors listed in the Emergency Contacts list presented at the front of this Plan; • The Facility Response Coordinator (or senior on-site person) must immediately contact the MassDEP Emergency Response Center (888.304.1133) and the National Response Center (888-424-8802); • The Facility Response Coordinator (or senior on-site person) must record the call on the Discharge Notification Form in Appendix A; • The Facility Response Coordinator (or senior on-site person) coordinates cleanup and obtains assistance from a cleanup contractor or other response organization as necessary; and -8- K:\480-60\Reports\091613_Emergency Response Plan\txt.doc • The Facility Response Coordinator (or senior onsite person) shall inspect all components of the stormwater management system including manholes, catchbasins and Stormceptor units to insure that they are free of debris and contaminants and are functioning properly; and • Cleaning of the Stormceptor units shall be performed in accordance with the manufacturer’s recommendations. Refer to the Owner’s Manual presented in the Inspection and Maintenance Plan. If the Facility Response Coordinator is not available at the time of the discharge, then the next highest person in seniority assumes responsibility for coordinating response activities. 3.3 Wastes resulting from a minor discharge response will be containerized in impervious bags, drums, or buckets. The Facility Response Coordinator will characterize the waste for proper disposal and ensure that it is removed from the facility by a licensed waste hauler within two weeks. Wastes resulting from a major discharge response will be removed and disposed of by a cleanup contractor. WASTE DISPOSAL 3.4 Any size discharge (i.e., one that creates a sheen, emulsion, or sludge) that affects or threatens to affect navigable waters or adjoining shorelines must be reported immediately to the National Response Center (1-800-424-8802). The Center is staffed 24-hours a day. DISCHARGE NOTIFICATION The person reporting the discharge must provide the following information: • Name, location, organization, and telephone number; • Name and address of the party responsible for the incident; • Date and time of the incident; • Location of the incident; • Source and cause of the release or discharge; • Types of material(s) released or discharged; • Quantity of materials released or discharged; • Danger or threat posed by the release or discharge; • Number and types of injuries (if any); • Media affected or threatened by the discharge (i.e., water, land, air); • Weather conditions at the incident location; and, • Any other information that may help emergency personnel respond to the incident. Contact information for reporting a discharge to the appropriate authorities is listed on the Emergency Contacts sheet at the front of this Plan and is also posted in prominent locations throughout the facility. -9- K:\480-60\Reports\091613_Emergency Response Plan\txt.doc In addition to the above reporting, 40 CFR 112.4 requires that information be submitted to the EPA Regional Administrator and the appropriate State agency in charge of oil pollution control activities whenever the facility discharges (as defined in 40 CFR 112.1(b)) more than 1,000 gallons of oil in a single event, or discharges (as defined in 40 CFR 112.1(b)) more than 42 gallons of oil in each of two discharge incidents within a 12-month period. The following information must be submitted to the EPA Regional Administrator and to MassDEP within 60 days: • Name of the facility; • Name of the owner/operator; • Location of the facility; • Maximum storage or handling capacity and normal daily throughput; • Corrective action and countermeasures taken, including a description of equipment repairs and replacements; • Description of facility, including maps, flow diagrams, and topographical maps; • Cause of the discharge(s) to navigable waters and adjoining shorelines, including a failure analysis of the system and subsystem in which the failure occurred; • Additional preventive measures taken or contemplated to minimize possibility of recurrence, and, • Other pertinent information requested by the Regional Administrator. An Agency Notification Standard Report Form and Discharge Notification Form for submitting discharge information to the EPA Regional Administrator and to MassDEP is attached. 3.5 Contact information for specialized spill response and cleanup contractors are provided in Table No. 1. These contractors have the necessary equipment to respond to a discharge of oil at Butcher Boy Marketplace. CLEANUP CONTRACTORS AND EQUIPMENT SUPPLIERS -10- K:\480-60\Reports\091613_Emergency Response Plan\txt.doc This page has intentionally been left blank. APPENDIX A Discharge Notification Form and Agency Notification Standard Report Page 1 of 4 K:\480-60\Reports\091613_Emergency Response Plan\Discharge Notification Form and agency Notification Standard Report.doc Discharge Notification Form Part A: Discharge Information General information when reporting a spill to outside authorities: Name: Butcher Boy Marketplace Address: 1077 Osgood Street North Andover, MA 01845 Telephone: 978.688.1511 Owner/Operator: Angus Realty 1077 Osgood Street North Andover, MA 01845 Primary Contact: Alan Yameen, Facility Response Coordinator Work: 978.688.1511 Type of oil: Discharge Date and Time: Quantity released: Discovery Date and Time: Quantity released to a water body: Discharge Duration: Location/Source: Actions taken to stop, remove, and mitigate impacts of the discharge: Affected media: air water soil storm water sewer/POTW dike/berm/oil-water separator other: _________________________ Notification person: Telephone contact: Business: 24-hr: Nature of discharges, environmental/health effects, and damages: Injuries, fatalities or evacuation required? Page 2 of 4 K:\480-60\Reports\091613_Emergency Response Plan\Discharge Notification Form and agency Notification Standard Report.doc Part B: Notification Checklist Date and time Name of person receiving call Discharge in any amount Alan Yameen, Facility Response Coordinator 978.688.1511 Discharge in amount exceeding 25 gallons Local Fire Department 978.688.9590 or 911 MassDEP Hazardous Materials and Waste Spills 888.304.1133 Discharge in any amount and affecting (or threatening to affect) a water body Local Fire Department 978.688.9590 or 911 Town of North Andover Water & Sewer Department 978.685.0950 or 911 MassDEP Hazardous Materials and Waste Spills 888.304.1133 National Response Center 800.424.8802 CHEMTREC Emergency 800.424.9300 Page 3 of 4 K:\480-60\Reports\091613_Emergency Response Plan\Discharge Notification Form and agency Notification Standard Report.doc Agency Notification Standard Report Information contained in this report, and any supporting documentation, must be submitted to the EPA Region 1 Regional Administrator, and to MassDEP, within 60 days of the qualifying discharge incident. Facility: Butcher Boy Marketplace Owner/operator: Angus Realty 1077 Osgood Street North Andover, MA 01845 Name of person filing report: Location: 1077 Osgood Street North Andover, MA 01845 Maximum storage capacity: Daily throughput: Nature of qualifying incident(s): Discharge to navigable waters or adjoining shorelines exceeding 1,000 gallons Second discharge exceeding 42 gallons within a 12-month period. Description of facility (attach maps, flow diagrams, and topographical maps): K:\480-60\Reports\091613_Emergency Response Plan\Discharge Notification Form and agency Notification Standard Report.doc Cause of the discharge(s), including a failure analysis of the system and subsystems in which the failure occurred: Corrective actions and countermeasures taken, including a description of equipment repairs and replacements: Additional preventive measures taken or contemplated to minimize possibility of recurrence: Other pertinent information: