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HomeMy WebLinkAbout2024/03/12 - Minor Modification Decision - - Bk 17 963 Pg2 02 #5144 To- - r 04-09-2024 @ 11 : 21a Tern of North Andover 14 Office of the Planning Department Community Development Division 120 Main Street ! • ! North Andover, Messachusefts 01845 NOTICE OF DECISION(Minor Modificatl016) - Date of Decision: March 1'.2,2024 Petition of: Merrimack College(owner)and Greystar Development East LLC Y Federal Street,Suite 1804 Boston,MA 02110 Premises Affected; 315 Turnpike Street North Andover,MBA 0IS45 Assessor's Map 25 Lot 13 BACKGROUND On December 5,20 2 3,the Planning Board approved a Limited Site Plan Review Permit to allow for the construction of a 77,600 SF building situated along Turnpike Street and a 62,000 SF building situated along Andover/Elm Street.Both buildings are comprised of academic and residential space for College use. The Site is located in the Residential 3 zoning district. On F ebruaTy 20, 2024 the Petitioner submitted a re qu e st for proposed modifications to the plans titled Corner Development Project at Merrimack College and issued August 17, 2 02 3 and last revised November 16,20023 as approved by the Planning Board on December S,2 023. In the D e c emb er 5, 2 0 23 de c i s1 on,on fin dire s of fact was that the Town,Owner,and Mas sDOT were to continue"discussions regarding the Mas sDOT Rt. 114 Roadway Improvement Project, including the potential for construction of an additional travel lane on Andover/Elm Street and such continued discussionslevaluati onsladvo c acy between the Town,Owner, and MassD o T will be a benefit to the Town as a whole". Merrimack College,VHB, Mas sD OT and GPI have spent significant time collaborating together on this analysis, studying concepts of further modifying the proposed Route 1114 corridor improvements project alo-ng Andover Street,the result of which is included in Exhibit A 1; Mas sD OT Andov er S treet Right Turn Lan e C oncept, Th i s cone ept include s widening of the ro ad by uti 1 i zin g a permanent highway access easement to include an approximately 2 0 0-foot long right turn lane and extended shared-use path along the Merrimack College side of Andover Street. it is the Petitioner's understanding that the MassD OT Corridor Improvements team will-be proposing to incorporate these, modifications into their Project. Foremost,the study confirmed that the proposed Corner Development Project as approved December S,2023 does not inhibit the physical ability to construct a widening of Andover Street. This turn lane was designed to satisfy the 9 S'percentile queue and will further improve operations and reduce intersection delay at Andover Street and Turnpike Street/Route 114. The previously approved plans included the proposed buildings with associated site amenities, landscaping,.and utilities. After coordination with MassDOT on the right turn lane and pedestrian connection to the site,the Petitioner submitted a request to include minor modifications to the Site Plans as shoe, on the attached Corner Development Project at Merrimack College plans,rele-i sfad for Minor T,' ., sP Bk 17963 Pg203 #5144 Minor Mod ificati011 315 Turnpike Street—Merrimack College March 12, 2024 Page 2 of 2 Mod if ications on February 20,2024,design overlays and summarized below. The following elements have not changed: • Proposed zoning conformance as approved by the Planning Board and Zoning Board of Appeals including frontage,setbacks,and btr i ld ing height. • Building footprints and locations. • Parking coLInts. • Einergenoy vehicle access. • Peak stormwater rates at or below existing peak rates. The proposed m i doll modifications include the following: • MassDDT widening of Andover/Elie Street to accommodate right turd lane(scope to be incorporated as part of the Rothe 114 Corridoi-Improvements Project). • Revised pedestrian connection at corner to accommodate fir ttt re Route 114 shared-use Path. • Relocated building entries and associated grading, walkways, and landscaping adjustments. • Revised storinwater management design to align witli layout and grading updates to further red Lice peak runoff rates fi-om previously permitted proposed conditions. - • Consolidated utility equipment and service yards. FINDINGS OF FACTS • The Petitioner attended the Match 12,2024 Plamfl'ng Board meeting to discuss the Insubstantial Change request with the Planning Board. • The proposed changes to the stormwater management design were reviewed by the Town's tliii-d party consultant, Horsley Witten and the changes were deemed to be ininor in nature(see March 7, 2024 letter frorn Janet Carter Bernardo, P.E. and Jonas Procton, E.I.T. Water Resources Engineer and letter dated March 25,2024 from Janet Carter Bernardo, P.E, and response letter-fi-0111 Jeffrey Koetteritz, P. E.VHB). + Auer discussion at the March 12, 2024 Planning Board Meeting,and upon a motion by P. Boynton to deem the modifications as minor and allow approval by the Planning Director upon sigh-off front the 3rd party consultant, for 315 Turnpike St.,Merrimack College. J. Simons seconded the motion. The vote was 5-0, unan'I'mous in favor.The finding of minor modification is conditioned on the following: CONDITIONS • The Petit"loiter shaI l comply witli al I existing conditions rendered 'In the approved Limited Site Plan Review Permit for the site. • This Notice of Decision shall be recorded when the Northern Essex Registry of Deeds and evidence of recording shall be provided to the Planning Department. • The following information shall be deemed part of the deeisioll: Flan tltted.: Corner Development Project at Merri mask College Bk 17963 Pg204 #5144 111SUbstantial Change 315 Turnpike Street—Merrimack College March 12, 2024 Page 3 of 3 PI•epat•ed for: Developen Creystar Development East,LLC 1 Federal Street,Suite 1804 Boston,M A 02110 Owner, Merri nack Col loge 315 TLIz•11pike Street North Andove,•, MA 01845 Sheets: Cover Page,C 1.0-05.0,C6.1-C6.3,L 1.0, L2.1,L2.2, SL1.0, Sv-1 P repax-ed by: v H B 101 Walnut Street Watertown, MA 02471 Date: August 17,2023,revised to February 20,2024 Stormwatet-Management liepot•t Prepat•ed for: Creystar Developinent East, LL.0 Mere•i inack College Pre pat•ed by: V H.B 101 WalIIut Street Watertown,MA 02471 Date August 17,2023,revised to February 20,2024 Stonnivater Management System Operations&Maintenance Manual Prcpat•ed for: Merrimack College Pt-epat•e(l by: ,VIfB 101 Wa I nut Street Watertown, MA 02471 Date: AUgLIst 17,2023,revised to Febr•Eiaty 20,2024 east Enrigl ,Planning Director Oki Behalf of the oilh Andover Planeflug Doat•d r Bk 17963 Pg205 #514 4. )ean Enright , Ref: 11625,34 hbt February 20,2024 Page, Memorandum APPENDICES AppendIx A.,SLUM ry • Exhlb(t Al MassDOT A►tdover Street Right 7iim Lurie Concept 0 Pxhlblt A2;Overlay of Revised Site Plans with Previously Pertr)ltted Site Plans Bk 17963 Pg206 #5144 Jean Enisight Ref: 11625.34 , February 24,2024 e Memorandum PagExhibit Al; MassDOT Andover Street Right Turn Lane Concept Bk 17963 Pg207 #514 + Y►1ii r 11.��!��+/.�! 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FF 44 10 r j r Wit ME ti•' � �y �� ���� '� fir... �: r rr F n Y�\1r�JrV t►L•rC7ti�{/f�7 rir��vuV:•t�.�s.�.crt rt-r��.r••r - Bk 17963 Pg225 #5144 STORMWATER MANAGEMENT SYSTEM OPERATIONS AND MAINTENANCE MANUAL Corner Development Project at Merrimack Colle e g 315 Turnpike Street North Andover, MA PREPARED FOR Merrimack College 315 Turnpike Street North Andover, MA 01845 978.837.5000 PREPARED BY hb. 101 Walnut Street PO Box 9151 Watertown,MA 02471 617.924.1770 August 17,2423 September 1 S,2023—Rev1 February 20,2024—Rev2 Bk 17963 Pg226 #5144 Bk 17 963 Pg22 7 #5144 Operations and Maintenance Plan I Corner Development Project at Merrimack college,315 Turnpike Street North Andover,MA Table of Contents ProjectInformation.................................................................................................................iii Section A: Source Control..........goof.....goo........*wool.................................,...,..................,,...,,..A 1 Section B:Spill Prevention ention.................................................,.............,............gee...,.pope goo........B-1 B.1 Initial Notification....................................................................................................................B-1 B.2 Further Notification.................................................................................................................B-1 B.3 Assessment—Initial Containment.....................................................................................B-4 SectionC:Snag Management..................................,.........,..........*gee.........*go Poe....,,*go..........C"1 Section D: Maintenance of Stormwater Management Systems......................................D-1 D•i Pavement Syste•r,s....................................................1......................................I..1...................D-1 D.1.1 Standard Asphalt Pavement...........................................................6...................D-1 D.2 Structural Stormwater Management Devices................................................. .............Q-1 D.2.1 Catch Basins/Area Drains.......... D.2.2 Structural Water Quality Devices......................................................................D-2 D.2.3 Subsurface Infiltration Basins.,.......6.6.......6........6................................................D-2 D.2.4 Roof Drain Leader.....................................................................................................D-3 D.3 Vegetated Stormwater Management Devices.............................................................D-3 D.3.1 Vegetated Areas Maintenance..........................................................................D-3 Section E:Operations and Maintenance Plan Summary......,.....,.....................................D-1 E.1 Routine Maintenance Checklists.......................................................................................D-1 E.2 Reporting and Documentation..........................................................................................D-1 E.3 Construction Practices Maintenance/Evaluation Checklist....................................D-2 E.4 Long-term Maintenance/Evaluation Checklist.............................................................D-3 E.5 Maintenance Checklists and Device Location Maps.................................................D-4 Section F: Product literature.................................,.........................................................,....F-1 SectionG: Maintenance Agreement.....9090 8.004 @*go I Opel 090 1 &oo4e*&oa6&a6a a6e*4 @G 1 i Table of Contents Bk 17963 Pg228 #5144 Operations and Maintenance Plan corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA ............................. ............ This page intentionally left blank. ii Table of Contents i Bk 17963 Pg229 #5144 Operations and Maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA Project Information Site Corner Development Project at Merrimack College 315 Turnpike StreetNorth Andover, MA 01845 Developer Greystar Development East, LLC 1 Federal Street, Suite 1804 Boston, MA 02110 857-288--1849 Facility Manager Felipe R, Schwarz Merrimack College 315 Turnpike Street North Andover, MA 01845 978-837-5459 Site contact Name: Telephone: Cell phone: Email: iii Project Information Bk 17 963 Pg2 30 #5144 Operations and Maintenance Pian Corner Development Project at Merrimack College,31S Turnpike Street North Andover,MA This page intentionally left blank. iv Project Information Bk 17963 Pg231 #5144 Operations and Maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA Section A: Source Control Bk 17963 Pg232 #5144 Operations and Maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA This page intentionally left blank. Bk 17 963 Pg2 33 #5144 Operations and maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA 00 Vhb A Source Control A comprehensive source control program will be implemented at the Corner Development site, which includes the following components: ? Regular pavement sweeping s Catch basin cleaning > Clearing litter from the parking area, islands,and perimeter landscape areas } Enclosure and regular maintenance of all dumpsters > Spill Prevention training A-1 Source Control Bk 17963 Pg234 #5144 Operations and Maintenance Plan I corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA ............... ....... ........ This page intentionally left blank. A-2 Source Control Bk 17 963 Pg2 35 #5144 Operations and Maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA Section B: Spill Prevention Bk 17963 Pg236 #5144 Operations and Maintenance Plan corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA This page intentionally left blank. Bk 17963 Pg237 #5144 Operations and Maintenance Plan corner Development Project at Merrimack college,315 Turnpike Street North Andover,MA Vhb& B Spill Prevention Spill prevention equipment and training will be provided by Greystar Development East, LLC. B.1 Initial Notification In the event of a spill the facility and/or construction manager or supervisor will be notified immediately. Facility Manager(name): Felipe Schwarz—Merrimack College Facility Manager(phone): 978-837-5459 Construction Manager(name): Jacob Hawes—Greystar Development East, LLC Construction Manager(phone): 857-299-7191 The supervisor will 'first contact the Fire Department and then notify the Police Department., the Public Health Commission and the Conservation Commission.The Fire Department is ultimately responsible for matters of public health and safety and should be notified immediately. B.2 Further Notification Based on the assessment from the Fire Chief,additional notification to a cleanup contractor maybe made,The Massachusetts Department of Environmental Protection (DEP)and the EPA may be notified depending upon the nature and severity of the spill.The Fire Chief will be responsible for determining the level of cleanup and notification required.The attached list of emergency phone numbers shall be posted in the main construction/facility office and readily accessible to all employees.A hazardous waste spill report shall be completed as necessary using the attached form, B-1 Spill Prevention Bk 17963 Pg238 #5144 Operations and Maintenance Plan I Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA Emergency Notification Phone Numbers 1. FACILITY MANAGER Name: Felipe Schwarz Phone: 978-837-5459 Beeper/Cell: 978-857-1845 Home Phone: Alternate Contact: John Waters Phone: 978-895-3252 Beeper/Cell: Horne Phone: 2. FIRE& POLICE DEPARTMENT Emergency: 911 ...... 3. CLEANUP CONTRACTOR Address: Phone: 4. MASSACHUSETTS DEPARTMENT OF ENVIRONMENTAL Emergency: 1-(888)304-1133 PROTECTION (DEP) - -- �-- ------ 5. NATIONAL RESPONSE CENTER Phone: (800)424-8802 Alternate: U.S.Environmental Protection Agency Emergency: Business: 6. NORTH ANDOVER HEALTH DEPARTMENT Phone: (978) 688--9540 North Andover Conservation Commission: Phone: (978) 688-9530 B-2 spill Prevention Bk 17 963 Pg239 #5144 Operations and Maintenance plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA Hazardous Waste&Oil S pi I 1 Report Date: Time: AM/PIA Exact location (Transformer Type of equipment: Make: Size: S N: Weather Conditions; On or near water? © Yes El No yes,If es name of bodyof water: Type of chemical I oil spilled: Amount of chemical/oil spilled: Cause of spill: Measures taken to contain or clean up spill: Amount of chemical/oil recovered: Method,- Material collected as a result of cleanup: drums containing drums containing drums containing Location and method of debris disposal-, Name and address of any person,firm, or corporation suffering charges, Procedures,method,and precautions instituted to prevent a similar occurrence from recurring: Spill reported by General office by: Time: AM/PM Spill reported to DEP/National Response Center by: DEP Date: Time: AM/PM Inspector: NRC Date: Time: AM/PM Inspector: Additional comments: a-3 Spill Prevention Bk 17 963 Pg2 40 #5144 Operations and Maintenance Plan corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA B.3 Assessment — Initial Containment The supervisor or manager will assess the incident and initiate containment control measures with the appropriate spill containment equipment included in the spill kit kept on-site.A list of recommended spill equipment to be kept on site is included on the following page. Dire/police Department: 911 North Andover Health Department (978) 688-9540 North Andover Conservation (978) 688-95.30 _ Commission-, Emergency Response Equipment The following equipment and materials shall be maintained at all times and stored in a secure area for long-terra emergency response need. su lies Quantit Recommended Suppliers > Sorbent Pillows/"Pigs" 2 http:l/wvv..newLaig corn Item#KIT276 —mobile container with two pigs > Sorbent Boom/Sock 25 feet htto:llwww.fvrestcv-suop lie rs.com Sorbent pads 50 > Lite-Drip Absorbent 5 ounds > Shovel 1 Item#33934 Shovel(or equivalent) p Bar 1 Item#43210 Manhole cover pick for equivalent)- - > Gocgles 1 pair Item#23334--Goggles for equivalent > Gloves-Leavy 1 pair Item#90926—Gloves(or equivalent) B-4 Spill Prevention Bk 17963 Pg241 #5144 Operations and Maintenance Plan comer Development Project at Merrimack College,315 Turnpike Street North Andover,MA Secti on C: Snow Ma nagement Bk 17963 Pg242 #5144 Operations and Maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA ......................................... ... ....... This page intentionally left blank. Bk 17963 Pg243 #5144 Operations and Maintenance plan 1 Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA Vhb* C Snow Management Snow storage areas are shown on the attached Snow Storage Area reap In Section E,5 Maintenance Checklists and Device Location Maps. > Snow storage areas will be managed to prevent blockage of storm drain catch basins and stormwater drainage swales.Snow combined with sand and debris may block a storm drainage system,diminishing the infiltration capacity of the system and causing localized flooding. Sand and debris deposited on vegetated or paved areas shall be cleared from the site and properly disposed of at the end of the snow season, no later than May 15. > Snort shall not be dumped into any waterbody, pond, or wetland resource area. C-1 snow Management Bk 17963 Pg244 #5144 Operations and Maintenance Plan Corner development Project at Merrimack College,315 Turnpike Street Forth Andover,MA This page intentionally left blank. C-2 Snow Management i Bk 17963 Pg2 4 5 #514 4 Operations and Maintenance Plan Corner Development project at Merrimack College,313 Turnpike Street North Andover,MA Section D: Maintenance Management Systems Bk 17963 Pg246 #5144 Operations and Maintenance Plan I corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA This page intentionally left blank. Bk 17 963 Pg2 47 #5144 Operations and Maintenance Plan I Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA f0f� vhb,4, D Maintenance of Stormwater Management Systems D.1 Pavement Systems D.1.1 Standard Asphalt Pavement > Sweep or vacuum standard asphalt pavement areas at least four times per year with a rotary brush sweeper and properly dispose of removed material. Recommended sweeping schedule: 0 Oct/Nov o Feb/Mar o Apr/May o Aug/Sep > More frequent sweeping of paved surfaces will result in less accumulation in catch basins, less cleaning of subsurface structures,and less disposal costs. > Check loading docks and dumpster areas frequently for spillage and/or pavement staining and clean as necessary. D.2 Structural Stormwater Management Devices D.2.1 Catch Basins/Area Drains The proper removal of sediments and associated pollutants and trash occurs only when catch basin inlets and sumps are cleaned out regularly.The more frequent the cleaning, the less likely sediments will be resuspended and subsequently discharged. In addition, frequent cleaning also results in more volume available for future deposition and enhances the overall performance.As noted in the pavement operation and Maintenance(a&M) section, more frequent sweeping of paved surfaces will result in less accumulation in catch basins, less cleaning of subsurface structures, and less disposal costs. D-1 Maintenance of Stormwater Management systems Bk 17 963 Pg2 48 #5144 Operations and Maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA There are five(5) catch basins and fourteen (14) area drains on the Corner Development site. These catch basins are constructed with sumps(minimum 4 feet)and hooded outlets to trap 0-2 Maintenance of Storrriwater Managernent Systems Bk 17963 Pg249 #5144 Operations and Maintenance plan I Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA debris,sediments, and floating contaminants.The area drains are Constructed with sumps (minimum 2 feet). Disposal of all sediments must be in accordance with applicable local, state,and federal guidelines.Catch basin and area drains locations are included in the Stormwater BMP Location Map included in Section E,5 Maintenance Checklists and Device Location Maps. Inspections and Cleaning > All catch basins shall be inspected at least four times per year and cleaned a minimum of at least once per year. > Sediment(if more than six inches deep)and/or floatable pollutants shall be pumped from the basin and disposed of at an approved offsite facility in accordance with all applicable regulations. > Any structural damage or other indication of malfunction will be reported to the site manager and repaired as necessary > During colder periods, the catch basin grates must be kept free of snow and ice. > Daring warmer periods,the catch basin grates must be kept free of leaves,litter,sand, and debris. D.2.2 Structural Water Quality Devices The Stormwater drainage system has three(3)structural water quality devices.These are Contech CDS151 S Water Quality Units,which efficiently remove sediment and hydrocarbons from stormwater runoff.A map showing the locations is included in Maintenance Checklists and Device location Maps. > Refer to CDS operation, Design, Performance and Maintenance Guide included in Section F. > Inspect devices monthly for the first three months after construction. > After initial three-month period, all water quality units are to be inspected at least four times per year and cleaned a minimum of at least once per year(when sediment reaches 8" in depth). > Follow manufacturer instructions and contact manufacturer if system is malfunctioning, D.2.3 Subsurface Infiltration Basins The subsurface infiltration/detention basins are used to detain and infiltrate roadway and rooftop runoff.There are three (3) subsurface infiltration basins on the Corner Development site.A map of the infiltration basin locations is included in Section E.5 Maintenance Checklists and Device Location Maps. D-3 Maintenance of Stormwater Management Systems Bk 17963 Pg250 #5144 Operations and Maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA ........... Inspections and Cleaning The subsurface infiltration systems will be inspected at least once each year by removing the manhole/access port covers and determining the thickness of sediment that has accumulated in the sediment removal row. If sediment is more than six inches deep, it must be suspended via flushing with clean - water and removed using a vactor truck. > Manufacturer's specifications and instructions for cleaning the sediment removal row are provided as an attachment to this section. Emergency overflow pipes will be examined at least once each year and verified that no blockage has occurred. > System will be observed after rainfalls to see if it is properly draining. D.2.4 Roof Drain Leader Roof runoff from Proposed Building 1 and Proposed Building 2 on the Corner Development site are directed to the subsurface infiltration units. } Perform routine roof inspections quarterly. > Keep roofs clean and free of debris. > Keep roof drainage systems clear. > Keep roof access limited to authorized personnel. > dean inlets twice per year or as necessary. D.3 Vegetated Stormwater Management Devices D.3,1 Vegetated Areas Maintenance Although not a structural component of the drainage system,the maintenance of vegetated areas may affect the functioning of the stormwater management system.This includes the health/density of vegetative cover and activities such as the application and disposal of lawn and garden care products,disposal of leaves and yard trimmings and proper aeration of soils. ) Inspect planted areas on a semi-annual basis and remove any litter. > Maintain planted areas adjacent to pavement to prevent soil washout, > Immediately clean any soil deposited on pavement. > Re-seed bare areas; install appropriate erosion control measures when native soil is exposed or erosion channels are forming. > Plant alternative mixture of grass species in the event of unsuccessful establishment. > The grass vegetation should be cut to a height between three and four inches. > Pesticide/Herbicide Usage—No pesticides are to be used unless a single spot treatment is required for a specific Control application, D-4 Maintenance of Stormwater Mlatiagement Systems Bk 17 963 Pg251 #5144 Operations and Maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA > Fertilizer usage should be avoided. If deemed necessary, slow release fertilizer should be used. Fertilizer may be used to begin the establishment of vegetation in bare or damaged areas, but should not be applied on a regular basis untess necessary. > Annual application of compost amendments and aeration are recommended. D-5 Maintenance of 5tormwater Management Systems Bk 17963 Pg252 #5144 Operations and Maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA This page intentionally left blank. D-f Maintenance of Stormwater Management Systems Bk 17963 Pg253 #5144 Operations and Maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA Section Eo. Operations and Maintenance Plan Summary Bk 17963 Pg254 #5144 Operations and Maintenance Plan I corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA This page intentionally left blank, Bk 17963 Pg255 #5144 operations and Maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA Vhba Ott E Operations and Maintenance Plan Summary This Operation and Maintenance Plan has been prepared in accordance with the Stormwater Management Policy developed by the DLP and CZM or local regulations as applicable. It specifies operational practices and drainage system maintenance requirements for the Corner Development site at Merrimack College. Requirements should be adjusted by the site manager as necessary to ensure successful functioning of system components. E.1 Routine Maintenance Checklists Routine required maintenance is described in Sections A—D.The following checklists are to be used by the property manager to implement and document the required maintenance and inspection tasks. E.2 Reporting and Documentation The site supervisor shall be responsible for ensuring that the scheduled tasks as described in this plan are appropriately completed and recorded in the Maintenance Log.Accurate records of all inspections, routine maintenance and repairs shall be documented and these records shall be available for inspection by members of the North Andover Conservation Commission, or their designated agent, upon request, The Maintenance Log shall: > Document the completion of required maintenance tasks. > Identify the person responsible for the completion of tasks. > Identify any outstanding problems, malfunctions or inconsistencies identified during the course of routine maintenance. > Document specific repairs or replacements. F-1 Operations and Maintenance Plan Summary Bk 17963 Pg256 #5144 Operations and Maintenance Plan I Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA E,3 Construction Practices Maintenance/ Evaluation Checklist Merrimack College Corner Development-North Andover, MA Cleaning or Best Repair Needed Date of Management Inspection Date Inspector Minimum Maintenance []Yes/No Cleaning performed Practice Frequency Inspected Initials and Key Items to Check (List Items) or Repair b Hay Bales/ Weekly and Sediment build up,broken Silt Fencing after any bales or stakes rainfall Gravel Weekly and Filled voids,runoff/sediments Construction after any into street Entrance rainfall Catch Basin Weekly and Clogged or sediment build- Protection after any up at surface or in basin rainfall Diversion Weekly and Maintained,moved as Channels after any necessary to correct locations, rainfall Check for erosion or breakout Temporary Weekly and Cracking,erosion,breakout, Sedimentation after any sediment buildup, Basins rainfall contaminants Stormwater Control Manager: E-2 Operations and Maintenance Plan Summary Bk 17963 P 257 #5144 Operations and Maintenance Plant Corner Development Prc�ect at Merrimack College,315 Turnpike Street North Andover,MA EA Long-term Maintenance/Evaluation Checklist Merrimack College Corner Development North Andover, MA Minimum Cleaning or bate of Best Maintenance Repair Cleaning Management and Key Items Inspection date inspector Cleaning Needed or Performed = Practice to Check Frequency Inspected Initials Frequency ❑Yes/No Repair b Street Vacuum sweeper 4X per year 4X per year* Sweeping - — -- --— --—-- --- --� minimum -- --- Deep Sump Remove sediment 1X 4X per year 1X per year or and Hooded per year or if>6 as necessary Catch basins inches Subsurface Remove sediment 1 X 1 X per year 1 X per year Infiltration per year or if>6 Basins inches Roof Drains Remove debris, 4x per year 2x per year clean inlets draining roof inlet cleaning, to subsurface bed inspection roof debris as necessary Water Quality Remove sediment 1 x 4x per year 1 x per year or Units per year or if>8 as necessary inches Recommend sweeping Oct/Nov,Feb/Mar,Apr/May 1ul/Aug with late winter most important Stormwater Control Manager: E-3 operations and Maintenance Plan Summary Bk 17 963 Pg258 #5144 Operations and Maintenance Plan Corner development Project at Merrimack College,315 Turnpike Street North Andover,MA E.5 Maintenance Checklists and Device Location Maps These checklists are provided for the maintenance crew to photocopy and use when conducting inspections and cleaning activities to the stormwater management systems. E-4 Operations and Maintenance Plan Summary Bk 17 963 Pg25 9 #5144 Operations and Maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street Dort h Andover,MA .............. Maintenance Checklists E-5 Operations and Maintenance Plan Summary Bk 17963 Pg2 6 O #514 4 Operations and Maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA Catch Basins—Inspect 4 times per year, clean when sediment depth >6 inches or at least once per year. Sediment Cleaning Catch Inspected Depth needed Date Basin (Y/N) (inches) (YIN) Cleaned Comments(Trash,Oil,Pet waste,Lawn Debris,Damage) A101 A103 8105 / C116 / f C117 Area Drains—Inspect 4 times per year, clean when sediment depth >6 inches or at least once per year, Sediment Cleaning Area Inspected Depth needed Date Drain (Y/N) (inches) (Y/N) Cleaned Comments(Trash,Oil,Pet waste, Lawn Debris,Damage) A108 B117 I I FX AD C101 C102 C103 C104 C105 / C107 C108 C115 I I C119 C121 C122 Water Quality Units—Inspect 4 times per year,clean at least once per year or when sediment reaches a depth of 8 inches. Water Sediment Cleaning Quality Inspected Depth needed Date Unit (Y/N) (inches) (Y/N) Cleaned Comments(Trash,Oil,Pet waste,Lavern Debris,Damage) A102 6102 C111 E-6 Operations and Maintenance Plan Summary Bk 17 963 Pg2 61 #5144 Operations and maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover, VIA Infiltration Basins—Inspect once per year. Sediment Cleaning Inspected Depth needed Date Basin (YIN) (inches) (Y/N) Cleaned Comments(Trash,Oil,Pet waste,Lawn Debris, Damage) SYS A SYS B I SYS C Roof Runoff Downspouts—Inspect roof drains monthly, clean inlets draining to the subsurface bed twice per year, Sediment Cleaning Inspected Depth needed Date Bldg# (Y/N) (inches) WN) Cleaned Comments(Trash,Oil, Pet waste,Lawn Debris,Damage) Bldg 1 --1 I I Bldg 1 —2 Bldg 2—1 I Bldg 2—2 E-7 Operations and Maintenance Plan Summary Bk 17 963 Pg2 62 #5144 Operations and Maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA Device Location Map E-8 Operations and Maintenance Plan Summary PS beft4opffwfynQxfOA&ql$wmmateqNI1625M-WP and$nwFkKwesi� Legend 4*1 CIO! TuMpike StreetlRoute 714 SNOW STORAGE EJY CATCH BASIN AREA DRAIN ................... AD - ----- WATER OUALITY UNIT AD PROPOSED AD BUILDING I I ii- 10 ROO;' DRAIN SS ■ SS LAJ RD SD SU8SURFACE DETENTION BASIN SS SNOW STORAGE LOCATION Iss Is J�t AD OR r OD a SS ca SS .-p AD AD \'\ P SS f SS SS SS sy I% CB AD SS CB Lp r_ SS A r% NIL J. SS @AE) AD *46 S �ROIPOSED 8 11LDING 2 rl C,';L I r ti '71 SS 0 60. LE) I 1,11401.1''1 0 aw, ON r 10I I"IIIIN*N Stormwater BM Location Plan Figure D1 0 30 60 120 Feet Comer Development Project LQ at Merrimack College August 17,2023 N) North Andover,MA Febroa ry 20,2024-RevZ 0) Ln ...................................................................................... Bk 17963 Pg264 #5144 Operations and Maintenance Plan I corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA ............................................. This page intentionally left blank. E-10 Operations and Maintenance Plan Summary Bk 17963 Pg2 6 5 #514 4 Operations and Maintenance plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA Snow Storage Areas Map E-11 Operations and Maintenance Plan Summary \%VhtA bfWMJIW4t-LO\1 I SZS34 Grer=f P3 162S*4 P,and Sr*w Fkut+-d-q Legend 1 -.- %Nft CINZ TuMpike Sire/-Route 114 , SNOW STORAGE ------------------ Ak l t 4r''r l PROPOSED I BUILDING 1 1 z [ a � r L = " 1 1 {� kk GEC' a 41D Ce t ` + PO Q C • `j' � ``��`J' I �� j a t PROPOSED ti 1 6 ILDING 2 •, 01 - • f f � r SEC r--�-�.-_ J L ? td r W `%hb Snow Storage Figure D2 0 Comer Development Project b 30 60 120 Feet LQ at Merrimack College August 17,2023 N North Andover,MA February 20,2024-Rev2 01 (3) U1 F" OP Bk 17963 Pg267 #5144 Operations and Maintenance Plan Corner Development Project at Merrimack college,315 Turnpike Street North Andover,MA .................. Section F: Product Literature s � � � • � a 1 1 •� �r��.v M/`:r��r}ir,'rye•,"vC�,��:"`-'f�cy��J"4'�C�,;S���-��� ¢:r::^.�',.:r��/'e='�.�. _... ..�;=;, :'c's„��.`�"�t:�,.�rc:`;y.�.%.ram� 'w•4/ '.7- �r�i_7�'l.trams✓�-.'rr':�,.��•'•r :.':.:'_':�:%�r ,:.;f y..v ��:c� /,.•._.a�r����,/,.ti• %� 7. � .tom' -r �`r C`�r^' 7•: ..: AIL ,r3`."ice;?:'./,,-:.� rrrr Fy ,:r :ry•� %y::!:r'v/ .•w'.� :ti:;♦;i!:';= =1.r':^�'�r.r. �;'..-' -•e• :I:: _ 7•d. •r ••>♦••'L .f f �^' -,,,,y ram.. :r .r+. -r .x�r ; r Jam' 'r- ,�.•-ti},�r.• .0 - �:r�.••: •'�!'• C r Wit' J �/. _r .I • r' P w• - � �lz - rr-r = r •^f61•+.vim • At ! •�it• �' =A 'Y•4 J r •sY. v ..l1 •f• � irk } - .. =. "M. i}.r �!•' `•rf_ ire'i• /i�" t. •,f• OFF�-ZFF S••M art I I l Wit• I� �r�/. r � /r•^' w•' :l .f ZeF 4 .✓ •4 r' vr r r r =. rc.- lk .5r -l. ••J..fC n - r •�;1r yr. •r• '( 1. Yam!:•' / rr r li•'i' ..7 .r .{.• i. .:w'•: ''r�i .G .fit rr :�•- ice- - ="sr•- .�:... •r=' _ :, r r ^e :i�. .�:. ?ti• r' .r• ''.•y /% ter...• r� r r rv' ��:•ice � -¢'u, _n '•..i.-`r.I ::%w. .a� i•r•r-.r. S f.�� /•:.. s=r•= �- ��j^t•%�r. - ��/•-�:e• •r• .r.�::Yr N i a. ._.. .r f a•�•r•�• ti yy.Y. •,�.• •r3'/: ��I.'::. _ � •ram"= 'r y ti'K= l.! r� .Jr. .{�i ps..,_ .. .r r .r•. c.r�«t ri-. '� •3^ :ice /! =�i,i i�.Yl, 'N, r-'•, • - • �. .r•.•:~:Ki•:�•..y.`•'�V•'• rIF`•'r�.�•�r./ r :I;rti�.Y.�% " �I'•q..j'. :"1'�•' •�'n •� w�4.• .1�:_..�.:;:!r. .If�✓JL,�ti�'.'✓ .•!�'��,♦. ,;!"'' 1% _r.r"• ., ♦ + 'i.Y ry:r '.,.• •:•::�r•�.',`.y.ti.' -r r.;/.� ../� r,,.7:='��y:,N/�1'�_• '•=.c�%...I.•: _ - Y�,-c�%�..r�.�'r.8'r���-`.�rs,.4 M•`+r:`.',r ,r ?f'+�•j - •r:i� r:y Il.�f.,c';c...;F'r•'"`: .� :�' /<` -�':. { w'��r,�S:;%:1'S^/•s%�C••:,.. •r.' :.. .., },•� r t^ Y.r.r • M. •f r'F �1 r r)• h- r,e. r �f b r 7•r r y• r� � I• _ �1 _ Y} J � mod•- ^ry .r• Y r�. .'i•• :'r• •n lowNX+ �S k. 'r'• mp .7' - r I i: Yam"•' b. '�iii.. .r` 1 r�^j .J4• �f�f�r•a •►1'•• �`i• -r •� .sr S� '7r _ ..`r+ e� •�R n'r'• / � 1:�v I• �p C� r. •.• !ti I-'ram ti•�. ..7 •I {. . •••w�. �•^ .,r+•"tea 1 r" t. J� �~• r'i^'l,..IYY�•F{%,fY�J.'♦•C�M�'• ,�'• ` ,/�. •1._ �1 - `r i- � -r !' • I F'�• O .< it, rr- •'fir• '�. r• �'. � I �1 �-j 1• I � :ice:-��. :r,.r:. ,.{-;�:' ..-���^,I�' �•�'� '�' � I �.'�•" l } r.clw: s •.J: ♦�' -T '.. 1 �J� W �.Yam' •/!�'t_ r.�'.~��f�':•r=��: !.' .1 l .. / r . 1 I � �Je* j n.>�•• �':.,'•'SL•ti r.r:.,.g,.^�.'.;�. � � J`1 At�� I IN/ � f Bk 17963 Pg2 6 9 #514 4 CDS"' Design Basics Using patented continuous deflective separation technology, the There are three primary methods of sizing a CDS system.The CDS system screens, separates and traps debris,sediment,and water Quality Flow Rate Method determines which model size oil and grease from stormwater runoff.The indirect screening provides the desired removal efficiency at a given flow rate for a capability of the system allows for 100%removal of floatables defined particle size.The Rational Rainfall Method"" or the and and neutrally buoyant material without blinding. Flow and probabilistic Method is used when a specific removal efficiency of screening controls physically separate captured solids,and the net annual sediment load is required. minimize the re-suspension and release of previously trapped pollutants. Inline units Can treat up to 6 cfs,and internally bypass Typically in the Unites States,CDS Systems are designed to = flows in excess of 50 cfs(1416 GIs).Available precast or cast-in- achieve an$0%annual solids Toad reduction based on lab place,off line units can treat flows from 1 to 300 cfs(28.3 to generated performance curves for a gradation with an average 8495 lls).The pollutant removal capacity of the CDS system has particle size(d50)of 125 microns{arm). For some regulatory p environments,CDS systems can also be designed to achieve an been proven in lab and field testing. y g 80%annual solids load reduction based on an average particle peration �e�'view size 054}of 75 microns{arm}or 50 microns(urn). Stormwater enters the diversion chamber where the diversion Water Quality Flow Rate Method weir guides the flow into the unit's separation chamber and In some cases, regulations require that a specific treatment rate, pollutants are removed from the flow.All flows up to the often referred to as the water quality design flow(WQQ), be system's treatment design capacity enter the separation chamber treated.This WQQ represents the peak flow rate from either and are treated. an event with a specific recurrence interval,e.g.the six-month Swirl concentration and screen deflection force floatables and storm,or a water quality depth,e.g. 1/2-inch (13 mm) of solids to the center of the separation chamber where 100%of rainfall. floatables and neutrally buoyant debris larger than the screen The CDS is designed to treat all flows up to the WQQ.At influent apertures are trapped. rates higher than the WQQ, the diversion weir will direct most stormwater then moves through the separation screen under flow exceeding the WQQ around the separation chamber.This g p tl�t i co nstant c#o remain relatively osann e - the oil baffle and exits the system.The separation screen remains allows removal efficiency _ clog free due to continuous deflection. separation chamber and eliminates the risk of washout during bypass flows regardless of influent flow rates. During the flow events exceeding the treatment design capacity, the diversion weir b asses excessive flows around the se aration Treatment flow rates are defined as the rate at which the CDS Yp p will remove a specific gradation of sediment at a specific removal chamber,so captured pollutants are retained in the separation cylinder. efficiency.Therefore the treatment flow rate is variable, based on the gradation and removal efficiency specified by the design engineer. CMVE INUT Rational Rainfall Method r rnc�rREw - �= CUAB'N'EI°FUr' ) Differences in local climate, topography and scale make every =_= site hydraulically unique.It is important to take these factors into [?IfLEGT1OY PAN,]5E3ED - -_ consideration when estimating the long-terns-performance of ,,;y �- L s_.. {G01 E rYIE I bESrG•71 -- any stormwater treatment system,The Rational Rainfall Method MST OF NIMSVOUR = 0K EACH SIM combines site-specific information with laboratory generated _F' "'°"" R performance data,and local historical precipitation records to r.= 4 - estimate removal efficiencies as accurately as possible. R-0IETFLVa1E _ - = - Short duration rain gauge records from across the United States and Canada were analyzed to determine the percent of the total annual rainfall that fell at a range of intensities. US stationsILL depths were totaled every 15 minutes,or hourly,and recorded in �F 0.01 inch increments.Depths were recorded hourly with 1-mm Palma PIPES POSSIU13 resolution at Canadian stations.One trend was consistent at OUR ET +;fir: Oil Mff LE all sites; the vast majority of precipitation fell at low intensities --- _ - and high intensity storms contributed relatively little to the total annual depth. $fPARJ rVJ$LAS SUA`.P STORAQ These intensities,along with the total drainage area and runoff coefficient for each specific site,are translated into flow rates using the Rational Rainfall Method.Since most sites are relatively small and highly impervious, the Rational Rainfall Method is appropriate.Based on the runoff flow rates calculated for each intensity,operating rates within a proposed CDS system are 2 Bk 17963 Pg270 #5144 determined. Performance efficiency curve determined frorn full Two different gradations of silica sand material(UF Sediment scale laboratory tests on defined sediment PSDs is applied to &OK 110)were used in the CDS performance evaluation. The calculate solids removal efficiency.The relative removal efficiency particle size distributions(PSDs)of the test materials were = at each operating rate is added to produce a net annual pollutant analyzed using standard method 'Gradation ASTM D-422 removal efficiency estimate. "Standard Test Method for Particle-Size Analysis of Soils"by a Probabilistic Rational Method certified laboratory. _ The Probabilistic Rational Method is a sizing program Contech OF Sediment is a mixture of three different products produced developed to estimate a net annual sediment load reduction for by the U.S. Silica Company:"Sil-Co•-Sil 106",'41 DRY"and a particular CDS model based on site size,site runoff coefficient, "20/40 Oil Frac". Particle size distribution analysis shows that regional rainfall intensity distribution,and anticipated pollutant the OF Sediment has a very fine gradation(d50 = 20 to 30 prn) characteristics. covering a wide Size range(Coefficient of Uniformity,C averaged at 10.6). In comparison with the hypothetical TSS gradation The Probabilistic Method is an extension of the Rational Method specified in the N1DEP(New Jersey Department artnent of Environmental used to estimate peak discharge rates generated by storm events protection)and MCAT(New Jersey Corporation for Advanced of varying statistical return frequencies(e.g.2-year storm event). Technology)protocol for lab testing, the OF Sediment covers a Under the Rational Method,an adjustment factor is used to similar range of particle size but with a finer d50(d50 for NJDEP adjust the run of f coefficient estimated for the 10-year event, is approximately 50pm)(NJ DEP,20Q3), correlating a known hydrologic parameter with the target storm event. The rainfall intensities vary depending on the return The OK 110 silica sand is a commercial product of U.S. Silica frequency of the storm event under consideration. In general, Sand. The particle size distribution analysis of this material,also these two frequency dependent parameters(rainfall intensity included in Figure 1,shows that 99.9%of the OK-1 10 sand is = and runoff coefficient)increase as the return frequency increases finer than 250 microns,with a mean particle size(60)of 106 while the drainage area remains constant. microns. The PSDs for the test material are shown in Figure 1. These intensities,along with the total drainage area and runoff IWO coefficient for each specific site are translated into flow rates 90.0 rSedimentr —- — ' u� {Avg) using the Rational Method.Since most sites are relatively small 80.0 — OK 110(Avg) and highly impervious,the Rational N1 7v.o — 9 y p Method is appropriate.Based �-NJCAY `• — �-• Tit--�"• •I-TT-TT• Y•• on the runoff flow rates calculated for each intensity,operating $0.0 -�;_;_�: rates within a proposed CDS are determined. Performance50-0 - - - - -- •--- •- ... efficient curve on defined sediment 4o.o y ent PSDs is applied to calculate - • ' ' ' ' . . _ solids removal efficiency.The relative removal efficiency at each 30 o s.y_`:�_ operating rate is added to produce a net annual pollutant 20.0 - _ removal efficiency estimate, n _•• -- - -: -.. 10.0 . r.- ..T..Lf r : •� Treatment Flow Rate 1 10 100 1000 The inlet throat area is sized to ensure that the WQQ passes Particle sine(14m) through the separation chamber at a water surface elevation equal to the crest of the diversion weir.The diversion weir Figure 1. Particle size distributions bypasses excessive flows around the separation chamber, . , thus preventing re-suspension or re-entrainment of previously rests were conducted to quantify the performance of a specific captured particles. CDS unit(1.1 cfs(31.3-L/s)design capacity)at various flow rates, ranging from 1%up to 125%of the treatment design capacity of Hydraulic Capacity the unit,using the 2400 micron screen.All tests were conducted The hydraulic capacity of a CDS system is determined by the with Controlled influent concentrations of approximately Zoo length and height of the diversion weir and by the maximurr� mg./L. Effluent samples were taken at equal time intervals allowable head in the system.Typical configurations allow across the entire duration of each test run. These samples hydraulic capacities of up to ten times the treatment flow rate. were then processed with a Dekaport Cone sample splitter to The crest of the diversion weir may be lowered and the inlet obtain representative sub-samples for Suspended Sediment throat may be widened to increase the capacity of the system Concentration(SSC}testing using ASTM D3977-97 "Standard at a given water surface elevation.The unit is designed to meet Test Methods for Determining Sediment Concentration in water project specific hydraulic requirements. Samples",and particle size distribution analysis. Per orrnance Results and Modeling Full-,Scale laboratory Test Results Based on the data frorn the University of Florida,a performance A fu II•-scale CDS system (Model CDS2020-5B)was tested at the model was developed for the CDS system, A regression analysis facility of University of Florida,Gainesville FL. This CDS unit was was used to develop a fitting curve representative of the scattered data points at various design flow rates,This model evaluated under controlled laboratory conditions of influent flow g ' which demonstrated good agreement with the laboratory data, rate and addition of sediment, can then be used to CDS,edict system p performance with respect 3 i i Bk 17963 Pg2 71 #514 4 to SSC removal for any particle size gradation,assuming the Maintenance particles are inorganic sandy-silt. Figure 2 shows CDS predictive performance for two typical particle size gradations(N1CAT The�p5 system should be inspected at regular intervals and gradation and�K 110 sand as a function of o e i rate. maintained when necessary to ensure optimum performance, 9 la rat ng The rate at which the system collects pollutants will depend more _ toa,oa heavily on site activities than the size of the unit.For example, unstable soils or heavy winter sanding will cause the grit chamber $a,ao ............ ,`.•.�.-�...�..�. .............. to fill more quickly but regular sweeping of paved surfaces will i slaw accumulation. � oaao . 40.00 .a.........•.•. ...... .:.......................................... Inspection -,--=AT ..................+ Inspection is the key to effective maintenance and is easily x0.00 . . . performed. Pollutant transport and deposition may vary from oK�iO 0,00 year to year and regular inspections will help ensure that the 0% 20% 40°/o 60% 80% 1100% 120% 140% system is cleaned out at the appropriate time. At a minimum, o�benign 11owRate inspections should be performed twice per year(e.g♦spring and fall)however more frequent inspections may be necessary Figure 2• CDs stormwater treatment predictive performance for in climates where winter sanding operations may lead to rapid various particle gradations as a function of operating rate. accumulations,or in equipment washdown areas. Installations Many regulate jurisdictions seta performance standard for should also be inspected more frequently where excessive p amounts of trash are expected. hydrodynamic devices by stating that the devices shall be capable of achieving an 80%removal efficiency for particles having a The visual inspection should ascertain that the system mean particle size(d5o}of 125 microns(e.g.Washington State components are in working order and that there are no Department of Ecology`WASDOE-2008). The model can blockages or obstructions in the inlet and separation screen. be used to calculate the expected performance of such a PSD The inspection should also quantify the accumulation of (shown in Figure 3). The model indicates Figure 4)that the CDS hydrocarbons, trash,and sediment in the system. Measuring system with 2400 micron screen achieves approximately 84°la pollutant accumulation can be done with a calibrated dipstick, removal at fhe design 00°/0)flow rate, for this particle size tape measure or other measuring instrument.If absorbent distribution(dSU = 125 urn). material is used for enhanced removal of hydrocarbons,the level of discoloration of the sorbent material should also be identified P"de Sire Dlatribu im 100 • 1 1[• r 1 11.!•. 1 , 11.1 . r aralll go a a a•••• 1 1,1 1 r•1 1 . • •1•11 r 1!1 r 11 I r•1/• a 1 /f•/11 • . .111E . t •!1 111 00- ! 1 1[•a•1 • a 1 1•►•► • • ►1 1• • 1 r a l l l a 74 1 ! 1a••rl 1 1 ••lira r [/►a► r / aaaa 1 1•,•1 1 , I a•1►1 ► ►-L a►1a . a a.1 1 1! - OD • a 1 a•+•• • • ►►•1•1 / • • • •a•r • 1 a a 1•1 1 ! ► ,/•••1 1 • /a•11► 1 / r 1/r1► 1 r /.a lalo _ • r ►1 r••1 1 1 1 a.a Irl • r r 1•aa a a //a•aa 1 a 1/1 1.1 a a / !a►al 1 i //I t l l _ � • 1 1.•l a•1 1 • I l a,•1 / • / •1„1 1 1 1 1�1 1 1 / 1 1 1•••1 1 • l a a.►1 / • ! •a 1 11 1 1 //,1 1 1 1 •a!a 0.t I a 1 1 1 1 1+1 1 / • • [!I tl 1 1 !1 1 1 1 1 1.20 •/!•/1 1 • 11:i4 1 • [ la11a 1 1 111l11 11•41 1 1 1 1 1, 1 • .1 1 a♦a a a 1/• 0 .,, 1 10 i 0o 10000- 1 OdOD P40a Size(mlcron) _ Figure 3. WASDOE PSD CDS Unit Rerformamo(ow bcotogy PW c6z;125 run IOMO 1 1 r r 1 80 --- ..... ' ..... ' ...-- * ---•- 0 • a ..... a .... a 1 .w.• 1 •..... - - ' Y.=-*19.145x*100.92 ;20 01 Cr/4 2V/Q 401% W/o $06/O 1{ IO 120'6/a 14M/a !o Deslgn Flow Rate Figure 4. Modeled performance for WASDOE PSD. > ►� : '}► f..:. :. 4 Bk 17963 Pg272 #5144 during inspection, It is useful and often required as part of Cleaning operating permit to keep a record of each inspection. A simple - p g p p p Cleaning of a CDS systems should be done during d weather form for doing so is provided. Y 9 conditions when no flow is entering the system.The use of a Access to the CDS unit is typically achieved through two manhole vacuum truck is generally the most effective and convenient access covers. One opening allows for inspection and cleanout method of removing pollutants from the system.Simply remove of the separation chamber(cylinder and screen)and isolated the manhole covers and insert the vacuum hose into the sump. sump. The other allows for inspection and cleanout of sediment The system should be completely drained down and the sump = captured and retained outside the screen. For deep units,a fully evacuated of sediment.The area outside the screen should single manhole access point would allows both sump cleanout also be cleaned out if pollutant build-up exists in this area. and access outside the screen, In installations where the risk of petroleum spills is Small, liquid The CDS system should be cleaned when the level of sediment contaminants may not accumulate as quickly as sediment. has reached 75%of capacity in the isolated sump or when an However, the system should be cleaned out immediately in the appreciable level of hydrocarbons and trash has accumulated, event of an oil or gasoline spill. Motor oil and other hydrocarbons If absorbent material is used,it should be replaced when that accumulate on a more routine basis should be removed significant discoloration has occurred. Performance will not be when an appreciable layer has been captured.To remove these impacted until 100%of the sump capacity is exceeded however pollutants,it may be preferable to use absorbent pads since they it is recommended that the system be cleaned prior to that are usually less expensive to dispose than the oiVwater emulsion for easier removal of sediment. The level of sediment is easily that may be created by vacuuming the oily layer.Trash and debris determined by measuring from finished grade down to the can be netted out to separate it from the other pollutants. The top of the sediment pile. To avoid underestimating the level of screen should be cleaned to ensure it is free of trash and debris. sediment in the chamber, the measuring device must be lowered Manhole covers should be secure) seated followingcleaning to the top of the sediment pile carefully. Particles at the top of y g the pile typically offer less resistance to the end of the rod than activities to prevent leakage of runoff into the systern from above and also to ensure that proper safety precautions have been consolidated particles toward the bottom of the pile. Once this followed.Confined space entryprocedures need to be followed measurement is recorded, it should be compared to the as-built p drawing for the unit to determine weather the height of the if physical access is required. Disposal of all material removed sediment pile of f the bottom of the sump floor exceeds 75%of from the CDS system should be done in accordance with local the total hei ht of isolated sure regulations. In many jurisdictions,disposal of the sediments may 9 p be handled in the same manner as the disposal of sediments removed from catch basins or deep sump manholes.Check your local regulations for specific requirements on disposal. f t f 1 y - + r 5 Bk 17963 Pg273 #5144 SedimentDistance from water Surface Diameter • to Top of • Pile CDS •• CDS 1515 3 0.9 3.0 0.9 0.5 0.4 COS 2015 4 f..2 CDS2015 5 1.5 3.0 0.9 ........1,3 1.0 .......... . ............'C ....... 2 .5 15 35 t 1 1.3 1.0 CDS2025 5 1.5 4.0 1.2 1,3 1.4 CD 3�2U 6 1.8 ..... 4,0 1.2 �.1 1.6 .......... ..................... CDS302 5 6 1.8 4.0 1.2 2.1 1.6 O W 5303O. 1.$ .4 6 . .4 Z.1 ;1.6 CQS3035 6 1.8 5.0 1.5 2.1 1.6 L D5030. 8 2.4 4.6 14. . .......... 5 4.3. .............. CD54040 8 2,4 5.7 1.7 5.6 4.3 ........... S4045 .4 6. 9..... 1 5.6 4.3 CD5564O 10 3.0 6.3 1.9 8.7 6.7 CDSS&53 ........................... 10 3,0 7.? CD55668 10 3.0 9.3 2.8 8.7 6.7 CO55fi78 1 0. ,4 14.3 3.1 8,? 6.7 Table 1: CDS Maintenance Indicators and Sediment Storage Capacities Note:To avoid underestimating the volume of sediment in the chamber,carefully lower the measuring device to the tap of the � sediment pile. Finer silty particles at the fop of the pile may he more difficult to feel with a measuring stick,These finer articles g p typically offer less resistance to the end of the rod than larger particles toward the bottom of the pile. r- - 6 Bk 17963 Pg274 #5144 CDS Inspection & Maintenance Log CDS Model; Location: Water Floatable Describe Maintenance Date depth to Layer Maintenance Comments sediment' Thickness2 Performed Personnel 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 the values listed in table 1 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 sys tern 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. 7 Bk 17963 Pg275 #5144 SUPPORT • Drawings and specifications are available at www.ContechES.com, CONTECH • Site-specific design support is available from our engineers. ENGINEERED SOLUTIONS g 800-338-1122 vwtirw.ContechES.com 02017 Contech Engineered solutions LLC,a QUIKRETE Company Contech Engineered Solutions provides site solutions for the civil engineering industry.Contech's portfolio includes bridges,drainage,sanitary sewer,earth stabilization and stormwater treatment products.For information on other Contech division offerings,visit www.ContechES.com or call 800.338.1122 NO THING IN 7 HIS CATALOG SHOULD BE CON STRU ED AS A WARRANTY APPLICAT Ia NS SUGGE STED HE REi N ARE DESCRI BE D ONLY TO H El P R EADFRS MAKE TH E IR OWN EVALUAI(O NS AND DECISIONS,AND ARE NEITHER GUARANTEES NOR WARRANTIES OF SUITABILITY FOR ANY APPUCAT ION.CONTECH MAKES NO WARRANTY WHATSOEVER,EXPRESS OR IMPLIED,RELATED TO THE APPLICATIONS,MATERIALS,COATINGS,OR PRODUCTS DISCUSSED HEREIN,ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE ARE DISCLAIMED BY CONTECH.SEE CONTECH'S CONDITIONS OF SAU(AVA1LAOLF AT WWW.CONTECHES.COWCOS)FOR MORE INFORMATION. The produci(s)described may ba protected by one or more of the following US patents: 5,322,629;5,624,516,5,707.527;5.759,415;5,788,848;5,985,157;6,027.630;6.350.374:6,406,218; 6,641,720;6,511,595;6,649,048;6,991,114;6,998,038;7,186,058,7,206,692;7,297,266, related foreign patents or other patents pending. cds�manual 3/17 PDF fiECYCtED PAPER Bk 17963 Pg276 #5144 Operations and Maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA This page intentionally left blank. Bk 17963 Pg277 #5144 Operations and maintenance Plan Corner Development Project at Merrimack College,315 Turnpike Street North Andover,MA -S too 4. -®r. Section G: Maintenance Agreement Bk 17 963 Pg278 #5144 operasions and Maintenance Plan I Corner Development Project at Merrimack College, vhbo G Maintenance Agreement The Owner(s)hereby agree(s)to that they have read and understood this Operations and Maintenance Plan and for the length of their ownership will follow and conduct all inspection and maintenance procedures as stated in Sections A-F at the recommended internals,or as could be deemed necessary by any reasonable party,whichever comes first. 19 ey Doggett Sep ,20231U:tb EDT Jeffrey ogget t,Ed.]. Signature Printed Name 315 Turnpike St.,North,Aiidover,MA 01845 Address Telephone Number 9/26/23 Date M. PAUL IANNUCCILLO, REGISTER ESSEX NORTH REGISTRY OF DEEDS E—RECORDED