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Home My WebLink About2005-07-22 O & M Plan 8/17/2006 OPERATION AND MAINTENANCE PLAN 1600 OSGOOD STREET NORTH ANDOVER, MA. DEP #242-1352 M T= I w- Psi z,,f.l -v Vl 7.J µCD f*T N cn C ) C w August 17, 2006 ATTEST: A True-Copy Town Clerk i C\ T7 `iA I ' ESSEX NORTH REGISTRY OF DEEDS L 4WRENCE', MASS. A TRUE Copy-.-ATTEST - v R UGMTEA OI''DEED Operation and Maintenance Plan 1600 Osgood Street, North Andover, MA, DEP#242-1352 August 17, 2006 On behalf of 1600 Osgood Street, LLC, c/o of Ozzy Properties, Inc. (the "Applicant"), Fpsilon Associates, Inc. ("Epsilon") is pleased to submit this Stormwater Operation and Maintenance Plan ("O&M") for the property located at 1600 Osgood Street. The applicant received an Order of Conditions ("OOC") (DEP #242-1352) from the North Andover Conservation Commission on 4/27/06 approving a long term site maintenance program for the property. Activities approved under the OOC included selective brush removal, annual mowing activities, selective herbicide application, stormwater structure maintenance and sediment removal from stormwater structures and concrete lined stream channels. Condition #43 of the OOC requires the applicant to submit a separate comprehensive long-term Operation and Maintenance Plan for the stormwater structures on the site. The approved plan is required to be recorded at the Registry of Deeds and proposed maintenance activities are required to be conducted in perpetuity. The plan has been prepared to ensure that the existing stormwater systems function as designed. Responsible Party Ozzy Properties, Inc., or any successor Of, shall be the party responsible for adherence to the Stormwater Management Policy Operation and Maintenance Plan. Property Access ' Prior to access to gated/locked areas of the site, municipal Conservation personnel should contact the Facilities Manager 48 hours in advance to schedule an i appointment to access restricted areas, Contact information for the Facilities Manager is provided below: f 1 Robert Bartley Ozzy Properties, Inc. 1600 Osgood Street, Suite 200 North Andover, MA 01845 1 #(978) 681-5004 xt. 101 rbartley(pozzyp rope rties.com I i ` l i Notification The applicant and/or their consultant will notify Conservation personnel 48 hours in advance of in-stream maintenance activities. Existing Storm water Design The stormwater design on the site dates back to the 1950's when the project site was developed. Improvements and modifications to the stormwater design have occurred over the years (DEP #t`242-751). A significant amount of the project site is covered by impervious areas including buildings and parking lots. A network of catch basins exist throughout the expansive parking lot areas and stormwater ponds and concrete lined drainage channels exist within the less developed areas located along the northern and western property boundaries. No underground infiltration structures exist on the site. Years of inadequate maintenance on the site has resulted in significant sedimentation build-up within the stormwater structures. Specifically, the strearn system identified as Wetland Series 1 (Refer to Figure 3 submitted with the Notice of Intent application filed under ❑EP #242-1352), flows through a culvert under the southern parking lot and daylights at Wetland Series 8, which has steep concrete lined banks and a concrete lined bottom. Years of sedimentation build-up within Wetland Series 8 has resulted in the development of a vegetated channel bottom and vegetated sideslopes. In many areas along this section of the stream channel, the concrete lined sideslopes and bottom are no longer visible. Sedimentation build-up and vegetation has significantly reduced the flow capacity of this system. Specific maintenance activities proposed to be conducted on a yearly basis are described in detail below, Catch Basins Proposed yearly maintenance activities associated with catch basins located throughout the project site include sediment removal by a vacuum truck or clamshell bucket. Routine cleaning activities will be conducted throughout the year. Additionally, catch basins will be inspected annually and any collapsed catch basins will be replaced and pavement surrounding the basins will be repaired. HeadwallsllnletlOutlet Pipes Yearly maintenance of headwall inlets and outlets and pipe infrastructure is necessary to prevent sedimentation build-up and flooding on the project site. The inlets/outlets associated with Wetland Series 1, 7, 8, 11, 12, 15, 20 and 16 and 17 will be inspected in the spring and fall of each year. If necessary, repairs to 2 headwalls, grates, and piping infrastructure will be conducted. Removal of accumulated sedimentation and woody debris and vegetation will be conducted throughout the growing season of each year. Where possible, woody debris that has accumulated against the inlet and outlet grates will be removed by hand. Accumulated sedimentation at the inlet/outlet grates at the headwalls of Wetland Series 1, 8, 16 and 17 will be removed by an excavator. The excavator will be staged in a cleared upland area. Sedimentation removal will be conducted during low flow periods, if possible, so as to reduce downstream turbidity, however, sedimentation or debris that may be severely restricting inlets and outlets will be removed throughout the year on an as-needed basis. Erosion control devices will be installed to help reduce turbidity during sedimentation removal activities in high flow periods. If necessary, haybale check dams will be installed downstream to filter out sediments during cleaning operations. Excavated materials will be loaded onto a dump truck, removed from the buffer zone area, and disposed of properly. Concrete Lined Stream ChannelkDetention Ponds Sediment removal along sections of concrete lined stream channels and detention ponds will be conducted on an as needed basis. Significant sedimentation build-up has accumulated along channel slopes and bottoms, and vegetation, consisting of invasive species, has established in and along channels, especially in Wetiand Series 8. Accumulated sediments in areas along the concrete lined channels will be removed in order to maintain flow capacity and improve flood storage. Additionally, accumulated sediment in stormwater ponds may be removed, if flood storage capacity is being compromised. Sediment will be removed from areas along silted channels, where the restrictions are the greatest. Stormwater ponds and stream channels will be inspected in the spring and fall of each year to determine if sediment removal activities are necessary. Sediment will be removed by mechanical equipment staged along the upland edges of the banks. Equipment staging will be located in selected areas, so as to reduce impacts to vegetation. Sediment removal will be conducted in low flow conditions, if possible, so as to reduce downstream turbidity. If necessary, haybale check dams will be installed downstream to filter out sediments during cleaning operations. Excavated materials will be loaded onto a dump truck, removed from the buffer zone area, and disposed off properly. Parking LotSrveep/ng Parking lot sweeping activities will be conducted on an "as-needed" basis. 3 Erasion Control Measures Haybales Erosion and sedimentation controls will be employed to minimize erosion and the transport of sediment into resource areas during routine maintenance activities. When necessary, haybale check dams will be installed in stream channels during sedimentation removal activities. Erosion controls will be installed along the limits of disturbed soils to prevent runoff into wetland resource areas. Silt Sacs When necessary, silt sacs will be installed in catch basin outlets during dewatering activities or temporary stockpiling of soils and sediments. If necessary, silt sacs will be installed in catch basins adjacent to the designated snow stockpile areas. Silt sacs will be routinely inspected and cleaned and will be removed upon completion of dewatering activities and after the winter season. Dewateri ng If the need for dewatering activities arises during sedimentation removal activities, water will be pumped to either a haybale/stone containment area or through bladder bags. No water will be discharged into the existing catch basin system unless it has been properly filtered. Snow Stockpile Areas Designated snow stockpile areas have been drawn on Sheet 4 and 5 of the attached Site Plan Sheets, dated 9130/05, prepared by Chas. H. Sells, Inc. Snow will not be stockpiled within wetland resource areas, detention ponds or above catch basin inlets. If possible, snow piles will be located greater than 50 feet from wetland resource areas and stormwater drain inlets. Snow management will be conducted in accordance with the DEP Snow Removal Guidance Guidelines. 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