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Home My WebLink About20160419 Decision/operation & maintenance plan - Decision - 2302 TURNPIKE STREET 7/18/2016 COMMUNITY and ECONOMIC DEVELOPMENT DIVISION Building Conservation Health Planning Stevens Estate Zoning MEMORANDUM To: Richard Vaillancourt, Chairman BOS FROM: Jean Enright, Planning Director RE: 2302 Turnpike Street License Agreement DATE: July 18, 2016 Earth Works, Inc., Danny Gill President, was granted a Site Plan Review Special Permit by the Planning Board for the construction of a 15,516 SF mixed-use retail and business office commercial complex to be located at 2302 Turnpike Street (corner of Sharpners Pond Road and Turnpike Street). At the suggestion of the Conservation Administrator, Jennifer Hughes, Earth Works, Inc. incorporated a Low Impact Development measure into their site design by creating a rain garden which will allow for treatment of stormwater runoff from Sharpners Pond Road, where there is little treatment today. This rain garden is to be constructed within the undeveloped portion of the Sharpners Pond Road Right-of- Way. Per a condition of the Special Permit, Earth Works, Inc. is responsible for installation and maintenance of this rain garden in compliance of an operations and maintenance plan for the property. Earth Works, Inc. accepted all of the conditions set forth in the Permit and agreed to enter into this License Agreement regarding its use and improvements to the site. Danny Gill is owner of both Earth Works, Inc. and Gill Family LLC (the "Licensee"). Thank you for your consideration of this request. Sincerely, Jean Enright Planning Director Town of North Andover 1600 Osgood Street,North Andover,Massachusetts 01845 Phone 978.688.9531 Fax 978.688.9542 Web www.townofnorthandover.com OPERATION AND MAINTENANCE PLAN Operation & Maintenance Plan #2302 Turnpike Street North Andover, Massachusetts November 4, 2015 Revised December 29,2015 This Operation&Maintenance Plan has been prepared to comply with the provisions set forth in the Massachusetts Department of Environmental Protection(DEP) Stormwater Management Standards. Structural Best Management Practices (BMPs) require periodic maintenance to ensure proper function and efficiency in pollutant removal from stormwater discharges that would otherwise reach wetland resource areas untreated. Maintenance schedules found below are as recommended in Department of Environmental Protection's Massachusetts Stormwater Handbook and as recommended in the manufacturer's specifications. The stormwater management system owner and the party responsible for maintenance of the stormwater management system shall be Earth Works,Inc, and its designated employees. The following BMPs shall be utilized for pollutant removal from stormwater discharge as well providing additional groundwater recharge on site: • Deep-Sump Catch Basin w/hood • Sediment Forebay • Surface Infiltration Pond (1P) • Subsurface Infiltration Pond(11P) '..... • Rain Garden Deep-Sump Catch Basins w/Hood&Outlet Control Structure: • Inspect or clean at least once per year with special consideration given to the end of foliage and snow removal seasons. • Sediments must also be removed once per year or whenever the depth of deposits is greater than or equal to one half the depth from the bottom of the sump or one half the depth of the invert of the outlet pipe • ClamsheIl buckets and/or vacuum trucks are typically used to remove sediment in Massachusetts. • Cleanings may be taken to a landfill or other facility permitted by MassDEP to accept solid waste, without any prior approval by MassDEP. However,some landfills require catch basin cleanings to be tested before they are accepted. For information on all of the MassDEP requirements pertaining to the disposal of catch basin cleanings go to www.Mass.gov/dep/recycle/laws/``cafacts.doc Sediment Forebay: • Inspect the forebays monthly with special consideration given to the end of foliage and snow removal seasons and clean diem out at least four times per year. Operation & Maintenance Plan #2302 Turnpike Street, North Andover, MA November 4, 2015 Rev. December 29, 2015 Condition of riprap, Sediment accumulation and, Health of the turf. ® At least twice a year the buffer area,side slopes,and basin bottom shall be mowed. Remove the grass clippings and accumulated organic matter to prevent an impervious organic mat from forming. Remove trash and debris at this time as well as using deep tilling to break up any clogged surfaces, revegetate immediately. ® Remove sediment from the basin as necessary only when the floor of the basin is completely dry. Use light equipment to remove the top layer to prevent compacting the underlying soil. Deep till the remaining soil and revegetate as soon as possible. Subsurface Infiltration Pond (11P): ® Chamber maintenance is not generally required.However,recharge systems are prone to failure due to clogging. Regulating the sediment and petroleum product input into the proposed recharge system is the priority maintenance activity.Sediments and any oil spillage should be trapped and removed before they reach the chambers. Any upstream devices connected to the infiltration system(catch basins,deep sump manholes,proprietary devices) shall be inspected and cleaned at least once per year to prevent sediments and debris from entering and clogging the recharge system. s Sediments must also be removed whenever the depth of deposits is greater than or equal to one half the depth from the bottom of the sump or one half the depth of the invert of the outlet pipe. • The contractor shall verify that the required washed crushed stone and geotechrlical fabric materials are clean and free of sediments and petroleum residue prior to, during and after chamber system installation, ® Inspections of the chamber system shall be made by after every major storm for the first few months after construction to verify that proper functioning has been achieved,During the initial inspection the water level should be measured and recorded in a permanent log over several days to check the drainage duration and verify that sediments are not accumulating.If ponded water is present after 24 hours or an accumulation of sediment or debris is noted within the chambers the owner or designated property manager and engineer shall determine the cause for this condition and devise an action plan to improve system functionality, ® Once the chamber system has been verified to perform as designed,interior chamber conditions shall be inspected at least annualy. Post construction inspections (to be conducted through inspection ports) shall consist of documenting interior and stone bed conditions,measured water depth and presense of sediment.Should inspection indicate that the system is clogged (ponding water present after 24 hours and/or sediment accumulations) replacement or major repair actions may be required as determined by a professional engineer. Should the system require replacement or major repair actions the owner or designated property manager and engineer shall determine the cause for this condition and devise an action plan, 3 Operation & Maintenance Plan #2302 Turnpike Street, North Andover, MA November 4, 2015 Rev. December 29, 2015 • Keep the grass no lower than three(3) to four(4) inches but no higher than six (6) inches. Remove accumulated trash and debris prior to mowing. • Inspect for signs of rifling and gullying and repair as necessary. • Replace any vegetation damaged during the clean-out by either reseeding or resodding. If grass grown is impaired by winter road salt or other deicer use,re-establish grass in the spring. • If reseeding,utilize practices such as hydroseeding with a tackifier,blanket, or similar practice to ensure that no scour occurs in the forebay and allow the seeds to germinate and develop roots. Parkin Lot of Street Sweeping; • Street sweeping will be conducted four times annually within the parking lot area. Special attention will be given to the spring(March or April) and late fall(November or December). Snow Removal: • Snow will be removed from the parking area and sidewalks during snow events. The snow will be stockpiled in the designated"Snow Storage Area' locations as shown on the site development plan set. • Provisions will be made to remove snow from the site when the designated areas have reached their capacity. \V Rain Garden Outlet; IV • The rain garden outlet will be inspected during and after several storms (e.g. 0.5-inch or greater) and maintenance performed if necessary during the first year of operation.Thereafter,inspections and preventative maintenance shall be performed at least twice a year or after a major storm event which is defined as a storm that is equal to or greater than the 2-year,24-hour storm(3.7 inches in a 24 hour storm). Rip Rap Emergency Spillway&Level Spreader: • The emergency spillway and level spreader will be inspected during and after several storms (e.g. 0.5- inch or greater) and maintenance performed if necessary during the first year of operation.Thereafter, inspections and preventative maintenance shall be performed at least twice a year,and after every time drainage discharges through the high outlet orifice or a nnajor storm event which is defined as a storm that is equal to or greater than the 2-year,24-hour storm(3.7 inches in a 24 hour storm). • Any detrimental sediment accumulation shall be removed. • If rifling is present downgradient or adjacent to the emergency spillway or level spreader the damage shall be repaired. • Leaf litter shall be removed from the emergency spillway or level spreader area. 5 Operation &Maintenance Plan #2302 Turnpike Street, North Andover, MA November 4, 2015 Rev. 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