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HomeMy WebLinkAboutConsultant Review - 1160 GREAT POND ROAD 3/8/2004 TOWN OF NORTH ANDOVER PLANNING BOARD \ENGINEERING REVIEW OF WATERSHED SPECIAL PERMIT APPLICATION AND ASSOCIATED PLANS FOR CONFORMANCE WITH THE TOWN OF NORTH ANDOVER ZONING BYLAW AND STANDARD ENGINEERING PRACTICE Site Plan Title: Observatory Hill Faculty Housing Project VHB No.:06716.90 Location: Brooks School(Great Pond Road) Owner: Brooks School Applicant: Brooks School Applicant's Engineer. Rist-Frost Shumway Engineering,P.C. Review Date: March 8,2004 Vanasse Hangen Brustlin,Inc.(VHB)is providing an engineering review of the Watershed Special Permit Application and associated plans provided to date.This review is conducted in accordance with the Town of North Andover Zoning Bylaw,Massachusetts Department of Environmental Protection(DEP)Stormwater Management Policy and standard engineering practice. VHB has reviewed the following: ➢ Application for Watershed Special Permit,February 13,2004 ➢ Narrative attachment to,Application for Watershed Special Permit,Prepared by Applicant's Engineer,Revised February 27,2004 Supplemental Information for Application for Watershed Special Permit,Prepared by Applicant's Engineer,February 12,2004 ➢ Observatory Hill Faculty Housing Project Plan Set,Prepared by Applicant's Engineer,February 13,2004 ➢ Recharge Calculations,Observatory Hill Faculty Housing Project,Prepared by Applicant's Engineer,February 23,2003 The following comments note non-conformance with specific sections of the Zoning Bylaw, questions/comments on the proposed design,and VHB's recommendations/suggestions. General Comments: • VHB suggests that revised sheets C3 and C5 have a revision date on them. Section 4.136—Watershed Protection District • 3.b.ii. The Observatory Hill Faculty Housing Project falls under Uses Allowed by Special Permit subsection of the Watershed Protection District Bylaw due to TA06716.90\dots\1etters\rev1ew report03-10-04.dm ] drainage discharge encroaching on the Non Discharge Buffer Zone of Lake Cochichewick. See comment for 4.c.iv. • 4.c.ii. A map with a scale of 1 inch equals 40 feet was not provided as required by this section. However,the plan set includes a Watershed Protection District Plan with a scale of 1 inch equals 150 feet and a Proposed Site Plan with a scale of 1 inch equals 20 feet.Both of these plans have the required information(4.c.ii.1-6) displayed. • 4.c.iii. The Applicant's Engineer has certified that there will be no degradation to the quantity and quality of water entering the lake satisfying the requirement(see Narrative attachment to the Application for Watershed Special Permit). • 4.c.iv. While there appears to be other alternative locations for the Faculty Housing Project,the Applicant has provided a rational for the placement of the proposed structures and the necessary encroachment on the Non-Discharge Zone. • 4.c.vi. The Applicant's Engineer has provided a Turf Management Program Application Schedule and has stated that it is the school's policy not to use fertilizers in the Non-Discharge Zones(see Narrative attachment to the Application for Watershed Special Permit). Although this appears reasonable,it is unclear whether this is acceptable to the Town of North Andover. • 4.g. The runoff from the increase in impervious surface is proposed to be recharged through a drainage system ending in a swale that diverts stormwater to the preserved tree line. Therefore,it appears that the requirements of this section have been met. Standard Engineering Practice: ; • The parabolic drainage swale(drainage note 3,sheet C3)references a detail on drawing C5. There is no detail on sheet C5 pertaining to a swale. Summary— 1 Overall the Application for Watershed Special Permit has been well prepared and contains all the necessary information. It is recommended that the Applicant provide WRITTEN RESPONSES to the issues and comments in the General Comments and Standard Engineering Practice sections. Reviewed by: Date: Ross Morrow Civil Engineer—Highway and Municipal Vanasse Hangen Brustlin,Inc. Reviewed by: �Aaw 1 I L,(/ Date: Atb Timothy B.McIntosh,P.E. Project Manager/Senior Project Engineer—Highway and Municipal Vanasse Hangen Brustlin,Inc. 1 1 1:\06716.90\daa\1etters\rev1ew report03-10-04.doc 2 Memorandum Date: March 12, 2004 Job No.: 04-4648 To: Tim McIntosh,Vanasse, Hangin, Brustlin, Inc. From: John Scott, Rist-Frost-Shumway Engineering �`C Re: Response to Review Comments Application for Watershed Special Permit Observatory Hill Faculty Housing Brooks School N. Andover, Massachusetts We have received your comments,dated March 8, 2004, on the application for Watershed Special Permit for the above project. Below are our responses to your comments, in the same order. • General Comments. The revised drawings C3 and C5 have revision dates in the upper right corner just above the PE stamp. • 3.b.ii. No response required. • 4.c.ii. We trust the Board agrees that the scale of the plans submitted is better than a single plan at V = 40'. • 4.c.iii. No response required. • 4.c.iv. We trust the Board will accept our explanation in the Narrative regarding the siting of the buildings. • 4.c.vi. We trust the Board will agree that the School's turf management plan is consistent with the Zoning Bylaw. • 4.g. No response required. • Standard Engineering Practice: We have provided a detail of the parabolic swale on drawing C5, and herewith submit a second revision of the drawing. We appreciate the comment in the Summary regarding the overall quality of the submission. JLS:rIr AS146481VHB.TMclntosh.031204.m.doc cc: Julie Parrino, Town of N. Andover John Trovage, Brooks School Jim Pugh, Brooks School Peter Miner, Olson Lewis Dioli and Doktor