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HomeMy WebLinkAboutConsultant Review - 250 CLARK STREET 4/10/2013 Project No.NAND-0020 April 10 p ,2013 North Andover Planning Boarder & WILLIAMS North Andover Conservation Commission SPARA.GES 1600 Osgood Street ENOM PLANNERS SURVEYORS North Andover,MA 01845 I Subject: - Response to Stormwater Review by Eggleston Environmental) 250 Clark Street(Flight Landata,Inc.) DEP File No. 242-1584 Dear Members of the Planning Board and Conservation Commission, The purpose of this letter is to respond the few remaining comments that we received yesterday afternoon from Eggleston Environmental(EE)regarding the proposed expansion of the Flight Landata facility located at 250 Clark Street. The comments provided by Eggleston Environmental are shown in italics below,and,our responses are in the bold text that follows. 1. The proposed plan calls for a siltation fence erosion control barrier. Additional measures(e.g.hay bales or silt socks)may also be needed. In the Erosion&Sediment Control Plan included in our original Notice of Intent package dated February 7,2013,under Erosion and Sediment Control Device,please see the following statement starting in the middle of the second line... "It is important for the owner,builder, and/or site contractor to have access to a supply of haybales should the need arise for additional erosion and sediment control measures." We have added this text to the notes(Note 8)found on the revised site plan to ensure that this is emphasized during construction activities. 2. It appears that the proposed project may entail the disturbance of an acre or more of land. If so,it will also be subject.to the EPA Construction General Permit and require a Notice of Intent under that program, and implementation of a Construction Stormwater Pollution Prevention Plan (SWPPP)in accordance with the EPA guidelines. The amount of-proposed disturbance is approximately 37,000 square feet,which is less than the minimum required land disturbance of 1 acre required for a filing with the EPA. 3. The Pollution Prevention Plan included with the NOT addresses short-term construction related measures aimed at the site contractors. Per DEP requirements,a Long-Term Pollution Prevention Plan is still needed. As with the O&M Plan, this would be aimed at the parties responsible for maintaining the site in order to minimize the pollutant exposure to stormwater. Given the nature of the operations on the site, the storage and use of potentially hazardous materials as well as any vehicle(or airplane)washing,deicing, etc.should be addressed. 191 South Main Street, Suite 103 Middleton, MA 01 949 Tel: (978) 539-8088 Fax: (978) 767-8579 j i Response to Stormwater Review 250 Clark Street North_ Andover, MA / April 10, 2013 We have attached a revised Operation&Maintenance Plan that is to be used for the post construction period naming Flight Landata,Inc.as the party responsible for the operation and maintenance of the sormwater management system. We have also noted that if Flight Landata,Inc.were no longer the tenant the responsibility would revert back to the Leasehold Owner,Michael Florence. We have also attached a revised Inspection and Maintenance form to be used in the Long-Term which requires inspections twice per year, spring and fall,or within a 24 hours of a storm event with 2 year storm intensity or greater,i.e. 3.1 inches of rainfall within a 24 hour period. We have also shown designated snow storage areas that are currently being utilized by the property which are all up-gradient of the wetlands. We have spoken with Mr.Scott Stetson of KEYW Corporation(the parent company of Flight Landata,Inc.)and they do have an aircraft spill-kit located in their hanger,in the unlikely event of an aircraft leak. As presented by Attorney Jill Mann at the April 2,2013 Planning Board hearing,the.aircraft are not fueled at this location. In addition,they do not wash or de-ice the planes at this location according to Mr.Stetson. Therefore,there is no danger of contaminating the wetland resource areas with wash water runoff. We trust that you will find the responses above adequately address these last few comments made by the technical review agent and will allow you to close the hearing for the proposed expansion of the Flight Landata,Inc.facility. If you have any questions,please do not hesitate to contact me directly. Very truly yours, i Peter M.Blaisdell,Jr.,P.E.,P.L.S. Project Engineer PMB:CPS Enclosures cc: Attorney Jill Mann Scott Stetson/KEYW Corporation Lisa Eggleston,P.E.