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HomeMy WebLinkAbout2012-05-23 Planning Board Supplemental Materials (66) DRAINAGE FACILITIES OPERATIONAL AND MAINTENANCE PLAN MAY 15, 2012 498 CHICKERING ROAD LOWELL FIVE BANK NORTH ANDOVER, MASSACHUSETTS OWNER: PARK STREET REDEVELOPMENT, LLC 231 SUTTON STREET, SUITE 1B NORTH ANDOVER, MA 01845 PARTY RESPONSIBLE FOR O & M: PARK STREET REDEVELOPMENT, LLC 231 SUTTON STREET, SUITE 1B NORTH ANDOVER, MA 01845 SHORT TERM MAINTENANCE PROGRAM DURING CONSTRUCTION 1. A site inspection shall be performed by a P.E. during the construction of the grading and drainage facilities and those improvements shown on the Site Development Plans. These inspections shall be done at least once every week during the applicable construction period. Inspections shall not be required during periods of inactivity to these facilities. A report shall be generated and forwarded to the North Andover Planning Board and DPW after each inspection. 2. Care shall be taken at all times to control erosion and sediment movement by compaction of disturbed areas and by the use and maintenance of hay bale/silt fences at each drainage structure and at limits of work as shown on the Site Plans. Attention is called to the Sensitive Use Restriction recorded in Essex No. District Registry of Deeds Book 11072, Page 215 and all work shall be done as specified therein. An LSP shall be on site during excavation and earth moving operations to test soils and direct earthworks handling methods and procedures. The contractor shall take direction from the LSP and carry out all directives. All exposed soil finish surfaces shall be paved or immediately landscaped and stabilized; or loamed, seeded and mulched with a layer of mulch hay. Outside of the growing season, surfaces shall be covered with a layer of mulch hay until climate conditions allow for seeding. SHORT TERM MAINTENANCE PROGRAM DURING CONSTRUCTION (Cont’d) 3. The contractor shall ensure that all runoff is collected in the appropriate structures as they are constructed and that uncontrolled runoff is kept to a minimum. The contractor shall protect the safety of the personnel on site by installing grates or covers on each drainage structure when it is built. The site contractor for the project will be responsible for the operation and maintenance of the stormwater management systems during construction. 4. During construction, all drainage structures will be cleaned on an as needed basis and/or after heavy rainfalls. Prior to the placement of any impervious materials on site, all drainage structures shall be properly installed and functional. After construction, the inspection of catch basins, including the oil and grease traps other facilities such as roof drainage, grass swale, forebay and rip-rap areas shall be performed on a two (2) times per year basis. The basins are to be cleaned at least once per year (after spring street sweeping) to prevent blockage. If it is found at the time of cleaning that the depth of the accumulated sediment is greater than 50% of the depth of the sump, the maintenance schedule will be adjusted to include more frequent cleanings. Disposal of the accumulated sediment and hydrocarbons must be in accordance with applicable local, state, and federal guidelines and regulations. Structural repairs will be performed as needed. 5. The deep sump catch basins will also be inspected on a weekly basis during construction to insure that no appreciable amount of sediment remains in the sump for prolonged periods of time. Sediment can be removed by shovel for catch basins with installed oil separator hoods or grease traps. Any sediment overflowing into the discharge pipes from the catch basins is to be flushed to either the next downstream manhole or to the sediment forebay and then removed by machine or shovel. However, approval of the LSP must be obtained to assure that sediments not contaminated. 6. To reduce the amount of sediment entering the catch basins, and the drainage system during the construction of each phase of the project, the catch basins will be surrounded by haybales and a crushed stone berm. This will prevent some of the sediment from entering the catch basins during storm events. In addition, being discharged from the construction site, sediment contaminated storm water will be processed in the storm water treatment system. Clean water bypassing the site will be routed directly to the receiving stream. Sediment ponds and traps, vegetated buffer strips, sediment barriers or filters, dikes, and other BMP’s intended to trap sediment on site will be constructed as one of the first steps in grading. These BMP’s will be installed before other land-disturbing activities take place, if so directed by the Engineer. This is especially required in the grass swale, where mulch or other surface cover must be put over the seeded area until the grass germinates and reaches a stand of 2”. Selected BMP Straw Bale Barrier Brush Barrier Silt Fence Vegetative Strip Sediment Trap Stone Check Dams All excavated materials shall be properly handled and disposed during and after construction. SHORT TERM MAINTENANCE PROGRAM DURING CONSTRUCTION (Cont’d) 7. During the first year of operation the drainage structures and facilities including the forebay and drainage swale shall be inspected shortly after each storm event greater than 1.5 inches and again 2 to 3 days later to ensure that the systems are functioning properly and infiltration structures and detention ponds are emptied within three days. Any evidence of erosion in the swale or forebay, evidence of sediment in the roof drains and catch basins structures shall be repaired as outlined above. Any built-up sediment within the basin, and inlet pipes shall be removed and monitored for any additional built up sediment. Any extraneous shrub or brush from embankment areas shall be removed; any burrow holes or barren spots shall be filled with compacted loam and seeded. In the event that any drainage device is observed not functioning properly or excess sediment built-up is observed, the responsible party shall contact the P.E. within 72hours. 8. The above referenced maintenance sequence shall also be performed when the drainage system is complete and online after its initial 30 and 60 days. 9. Upon substantial completion of the drainage facilities an inspection shall be performed by the P.E. and report issued to the North Andover Planning Board. 10. Upon completion of and the successful establishment and stabilization of the site and the landscaped areas, the P.E. shall perform an inspection with an agent of the North Andover Planning Board/and or DPW. At the appropriate time, a report indicating that the construction, establishment, and stabilization of these areas are in substantial conformance to the plans and Conditions of Approval shall be provided to the Board. LONG TERM MAINTENANCE PROGRAM 1. Upon completion of the project, the owner shall be responsible for the operation and maintenance of the stromwater management system. The responsibilities shall extend to the grass swale, rip-rap forebay, piping and catch basins and manholes. 2. On or about every May 1 and November 1 of each year a site inspection shall be performed by a Registered Professional Engineer (P.E.) of the Commonwealth of Massachusetts to report on the status of the drainage system. The inspector will schedule the inspection with the responsible parties 48 hours prior to the inspection so arrangements can be made to access all drainage system components, including if necessary, roping off of the immediate areas within the site to assure appropriate and safe access. This report shall include the name, address and telephone number of the owner of the drainage facilities, the names, address and telephone numbers of parties responsible for the operation and maintenance of the drainage facilities, and an outline of remaining funds in the line item of the budget for drainage maintenance. The report shall also identify the current status of the drainage facility. The inspection shall include a visual inspection of each drainage structure including the catch basins, manholes, swale, forebay, roof drains, plantings, BMP”s and any other structure or condition relating to the long term operation of the drainage facilities. The report shall outline any observed pollution, if observed. The report shall be provided to the No Andover Planning Board and DPW and owner. LONG TERM MAINTENANCE PROGRAM (Cont’d.) 3. On or about May 1 and November 1 of each year, for two years, and then once a year thereafter, a Landscape Contractor that owns or has access to a vacuum truck or catch basin cleaner or by shovel shall complete the cleaning out of any debris in the drainage system and ancillary components. A short written report shall be prepared of the work performed, and to be submitted to the inspection (P.E.) for inclusion in this report. 4. If the inspector reports that work needs to be done to maintain any facility then the work must be completed within the next 4 weeks, unless otherwise specified, the condition of which shall be reported in the inspector’s next report. The owner shall become the responsible party of scheduling and bearing all costs associated with the maintenance requirements of the proposed drainage facilities. 5. On or about November 15 of each year a Landscape Contractor shall perform the service of cleaning out of any debris in the non-catchbasin drainage structures or drainage pipes. He shall prepare a short written report of the work performed and submit to the inspector (P.E.) for inclusion in this report. He shall report the status to the North Andover Planning Board, No Andover DPW and the P.E. 6. Once every year from the date of commencement, on or about November 15, the catch basins shall be thoroughly cleaned by mechanical and/or manual means to remove any debris and sediment, more frequently if sediment buildup is within 2’ of the outlet invert pipe. . Periodic power sweeping may be increased or decreased, as a result of debris accumulation quantities observed within the drainage facilities. 7. Once every year from the date of commencement, usually in the spring, a Landscape Contractor shall reseed or stabilize any areas which have eroded or developed sediment or which have developed conditions not shown on the plans. A written report of such activities shall be presented to the inspector for inclusion in his report. 8. Snow removal and disposal practices of street sweepings shall not be disposed of in any of the drainage structures. 9. The sweeping program is composed of two segments; Spring and Summer. The Spring program starts in April as early as possible and/or as the road and weather conditions cooperate. The Summer sweeping shall be done between the end of August to end of September, in advance of the Fall and Winter months. The contractor shall utilize vacuum or regenerative air sweepers. These types of sweepers are more effective and powerful in picking up the relatively heavier/coarser sediment/sand leftover from the Winter season/operations, and accumulated soil present in the late spring and summer months. 10. If the inspector reports that work needs to be done to maintain any facility then the work must be completed within the next four weeks, unless otherwise specified, and the condition of which shall be reported in the inspector’s next report.