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Home My WebLink About2005-07-22 Stormwater Pollution Plan and O&M Plan 04/22/2008 10:52 9786646052 PLANNING/CONSERVE PAGE 02 13ASBANIES WETLAND CONSULTING RECEIVED 39 Hardy St. � Ounstable, MA 01827 APR 222008 (978)e49-3839 ph &fax 978 808-1101 Cell NORTH ANDOVER CONSERVATION COMMISSION Stormwater Pollution Prevention Plan For Construction Activities At RECEIVED 189 Willow St., Lot 4 APR 1 North Andover, MA 01045 �� l..i�(j8 NOKIh"q�UvER April 2008 PLANNING DEPARTMENT The strategy of the SWPP is to minimize the impacts of the project on the / adjacent resource areas by providing erosion control methods, Ilmlting impervious area, providing better treatment of stormwater runoff by use of catch basins with deep sumps and hoods, detention basins and stormwater treatment units; and roof runoff with infiltration trenches. The stormwater management will conform to the Massachusetts department of Environmental Protection Stommwater Management Policy, Esletln0 Condiiflons The site Is a 2,97 acre forested lot that is located on the northern side of Willow St., North Andover. The wetland system, a typical Red Maple swamp, essentially surrounds the site while the central section of the lot is generally well drained upland, A small stream flows along the roadway at the entrance to the site. Planned Construction Activities The proposed work includes the construction of a 7200 s.f, medical building with panting under the building and an additional 18 spaces around the building. The project also includes the construction of a stormwater management system, wetland crossing and wetland replication area, The stormwater management system consists of 2 catch basins- one at the entrance to the site and the other at the north end of the site, The north and catch basin ties into a Stormceptor unit, The Stormceptor connects to a detention basin, t 04/22/2008 10:52 9786646052 PLANNING/CONSERVE PAGE 03 1 I Pollution Control Measures • No activities shall occur within 25' of the Border Vegetated Wetland except in those areas as shown on the plan i.e, the wetland crossing and the wetland replication area. No portion of the building structure will be located within 50' of the wetland resource areas. • Where feasible, existing vegetation shall be retained and protected. Stormwater runoff velocities shall be kept low. Long areas of unprotected disturbed slopes shall be avoided by use of temporary diversion ditches, stabilized earthen dikes or additional hay bales and filter fabric check dams. Erosion control consisting of silt fence and hay bales will be installed at the limit of work, immediately up-gradient of the 25' No Disturb Zone. This shall remain in place and be maintained for the duration of the project until the project is complete and groundcover is established. All erosion,control measures must be inspected on a weekly basis, cleaned, repaired or replaced throughout all phases of construction. Inspection must be done after a 1" storm event, v Additional hay bales and silt fence must be kept on site at all times. ■ Stockpiles shall,be secured with erosion control. Should work cease for more than 21 days, the stock pile and any other exposed soil areas shell be seeded with rye grass applied at the rate of 120 Ibslacres. ■ The stormwater system shall be constructed during initial phase of the project so it is functional during construction. The proposed detention basin may be used as a temporary sediment basin during construction and shall be periodically cleaned. The basin shall be cleaned, re-graded and stabilized with vegetation prior to permanent use. a Catch basins shall be provided with erosion control measure i.e. hay bales, filter fabric, filter socks. Steps shall be taken by the contractor to minimize bare earth exposure and general site disruption during construction, Measures shall be taken by all site personnel to control soil erosion resulting from construction operations, to prevent flow of sediment form construction site and to 2 04/22/2000 10:52 9786646052 PLANNING/CONSERVE PACE 04 contain construction material (including excavation and backfill) in order to prevent damage to all areas outside of the work limit. ■ Construction equipment placement shall be restricted to locations in the Immediate vicinity of building activity and shall not go beyond the limit of work as demarcated by the erosion control barriers, • A crushed stone construction entrance approximately 50' -75' long shall be Installed to minimize soil tracking onto Willow St. This shall be maintained or replaced as necessary. The entrance shall also be provided with a wash area, if needed, during construction. It Dust shall be controlled by water spraying as needed. Street sweeping shalt occur on site and Willow St. on a weekly basis or as needed. Other Control Measures v Dewatering shall be supervised by the erosion control monitor. Silt laden water shall be filtered through filter fabric and/or hay bales prior to discharge into the detention basln or other temporary sedimentation basin. • Construction site waste materials shall be properly contained on-site and disposed of at an off-site location in accordance with local and state regulations. • No de-icing chemical or salts may be used on the construction site • No chemical fertilizers or pesticides may be used on the construction site. ■ No materials including excavated material, trees, brush, stumps, asphalt materials, concrete curing compounds, fuels, wastewater from concrete truck or hydro-seeders, or any other pollutant shall be placed beyond the 25' No Disturb Zone or any wetland resource area. Spilt Prevention ■ Should any hydrocarbon or other hazardous waste spill on site, the project manager or site contractor shall immediately the North Andover Conservation Commission, North Andover Fire Department and/or the Department of Environmental Protectlon (DEP). • Before site work begins, a 55-gallon spill containment kit should be placed on site and maintained during the construction period. 3 04/22/2008 10:52 9786646052 PLANNING/CONSERVE PAGE 05 • For spills of a5 gallons, the area shall be secured with source control and cleaned with absorbent material or applicable means, unless an imminent hazard or other circumstance dictates that the spill should be treated by a professional emergency response contractor. For spills >5 gallons of material, the Massachusetts DEP shall be contacted at 978.694-3200. The Hazardous Waste Incident Response Group at 617-792-7853 and an approved emergency response contractor should also be contacted. Post—construction Pollution Prevention See attached Operation and Maintenance Plan Maintenance & Inspection Procedures ■ The erosion control monitor shall perform weekly inspections to review the erosion control, sedimentation prevention and stormwater management measures, ■ All potential problem areas shall be inspected within 24 hours of any storm event greater then 1". ■ All needed repairs shall be reported to the contractors to timely address the implementation of required actions. Necessary repairs shall be Implemented within 7 days of the inspection. * inspections will continue until final site stabilization Is achieved or upon approval of the Issuing authority. 4 04/22/2008 10:52 9786646052 PLANNING/CONSERVE PAGE 06 i RECEIVED MAR 2 3 2005 NORTH ANDOV�R �j r ) t ,�IoirRfeha rcC Yl n CONSERVAWN COMMISSION t tt Itrlrnrlter:tl+►rt !1�► .4tn►trtruEtrer nutttagenteut progrwn far parcel 4 Willow Street, North Andover, n 1;1 lEl+ I�rtSn tle:;i6nerl to mitibate pcttentittl impacts t:) ttte qunitty and quantity of ,E{►rt►twitter f}r�witlg front the site. In order to ensure that the stormwster tIUMgement I,1'..ility I�rrr"t,rt►�s adequately, u regular schedule of maintenance is rcgttired. The �,FII►►wing is n.tt Uvrtrview ofIlle �Itvrmwator Management ]~acility design followed by [h,: ►rat;n�►tmt;ntlt:�.l r►taintenancr. schecittle. I 1 nittiirttCri►trtrt� 5rI►et#ttle int►rtE►l nrttintr:ttittnce Inspect sill 3trt[ctures. I�entatve uny debris. ,', ltt�mr►ve i�xc.t•ssive cfebrls !i•Uttt ytortnwE#rar dctantityrt tncilltir~s. At►1,►Il1Iy 1'flititl}GtlEtrtCe ., tale[ Enid outlet structures t►re flea of debris, Remove" mny large,&hds tfom stormwOW detention fttrility. ;�tr►i-ttnt�tutl rfV)ititenanCe 1 uwcep parki Ig lot, with Or=occurring after lust Winter stwuling. I11spoc••t iltt: Teaching trench at manhole and clean any debris t 'lt;t►rt tautttp at entrance catch hasin. A. Rt,13111ve tluh►•is on rip yap aprort. I r►slErci I l}r Icr►rhing trench manhole~haSe, for serltntent. !'nrlitrrru�[�►:t: hased ntuinteaance '', I Ronu►ve gefinent/dehril front stout water detention facility when the depth +•xt;►;r;�tls [Itrrc irtt:hes. It+:tttr�,vr, tivhris from Stt'►rrrtaEptor in M ari,h Bt May, aaeh year In remove excess 1 In ttau[ tilt: ItiaOhing trench rawtltole, 151-40VAng every large stOMI(>2 inches). 1 t►fIL1' IfEa1110VUI; snow shall he removed from the site, in per{tetuity. I i c ►ta[tc;r ctI"!;ecutci— I•Ictlhroolc Realty'I"r+�st !icvelr�rx�r Dr. Sudarshan Ctwtterjee