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HomeMy WebLinkAbout2008-11-12 Response Comments SPR l =_ 44 Stiles Road• Suite One • Salem, New Hampshire 03079 o )niningBoard TEL (603) 893-0720 • FAX (603) 893-0733 MHF ©esig Co , tic. www.mhfdesign.com 4 M R A N D U M RECEIVED AUG 2 8 2008 To: North Andover Planning Board Date: 24 August 2008 Nus-,.,, nrv0OVER PLANNING DEPARTMENT From: Karl R. Dubay,P.E. Re: Sea Dog Kennel Site Plan Response to VHB review comments dated 06-25-08 The revised plans dated August 2008 incorporate the following responses: 1, No plan change required based on reviewer's 07-08-08 email maintaining the ADA layout as designed. 7. The ramp detail dimension and plan now match, 8. The FieldTur�f detail was indeed already provided in the plans, replacing the former detail (no plan change required); the area has been annotated on the Landscape Plan. 12. The incoming roof drain inverts were already specified in the drainage structure table. For clarification, we have updated all data per reviewer's comment#28. 17, The Stormceptor unit can indeed handle all flows, having a treatment capacity of 0,32 CFS per OEM specs verses the designed 0.17 CFS for the first flush 1" storm event (see attached calc summary). Connection from future development would be required to be fully pre-treated and flow-mitigated prior to entering into the system, in accordance with the Bylaw and plan notes. Thus, the current system as designed can indeed accommodate the future flow, and does indeed fully treat the flow with plenty of hydraulic capacity, The CB serial piping was reconfigured as recommended, although we pragmatically disagree with the reviewer, and further debate would essentially be nonproductive. 19. Additional overflow grading to CB3 (including the roadside swale) has been revised/improved and detailed as requested. 21. A reference note has been added to the CB detail for the Snout hood. 22. These calculations were previously provided in the "Drainage Pipe Design Analysis". The existing RCP has a hydraulic capacity of 7.0 CFS—which can accommodate the post-development peak flow of 5.3 CFS, Although this particular pipe sees an increase in peak flow, the overall system will have a slight peak flow reduction due to the reallocating of flows. 24. The requested pipe detail information was updated, including data for clarification purposes relative to continent#28, 26. The FES-2 label typo has been corrected on the Grading Plan, FES details have been revised to include FES 2 and 3, OCS data was updated, additional information was provided for clarity per continent#28, 27. Per the Planning Bdard's request, the fence has been removed. The basin was not designed as a wet pond and is anticipated to drain between storm events. 28. The plans have been updated to correct the minor inconsistencies and provide clarification. 29. An inlet frame/grate detail has been added. ENGINEERS + PLANNERS • SURVEYORS