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Home My WebLink About1999-04-06 Response to Peer Review DEF SUB CFL,ER & Q 36n[��O�NIQ�i FWMEFO FACSIMILE COVER SHEET To: Kathleen Colwell Company: North Andover Planning Board Phone: 978-688-9535 Fax: 978-688-9542 From; John C. Chossia Company- Coler & Colantonio, Inc. Phone: 781-982-5400 Fax: 781-982-5490 Date: January 12, 1999 Pages including this cover page: 3 Comments: Attached is the Preliminary Definitive Subdivision Review for The Sanctuary cc: Jim Rand,DPW 978.688-9573 Menimack Enginctring Services (978)475-1448 r 7 } COLER &COLANTONIOZ U ENGINEERS ANO SCIENTISTS January 12, 1999 Ms.Kathloon Colwell Planning Director 27 Charles Street North Andover,MA 01845 RE: Preliminary Engineering Review The Sanctuary Residential Subdivision Definitive Plan Dear Ms.Colwell: In response to your request, Coler & Colantonio, Inc. has reviewed the submittals for the above referenced site. This additional information has been reviewed for conformance to the submission requirements section of the "Rules and Regulations Governing the Subdivision of Land"in North Andover.The submittal includes the following information: Plans Entitled • "Definitive Subdivision Ilan - The Sanctuary located in North Andover, Mass." consisting of tan sheets dated.3/.31/98, last revised 12/2/98, Prepared by Merrimack Engineering Services. Received January 7, 1999. 9 "Pre and Post Development Subarea ,Plants", two sheets dated 10/16/99, ,prepared by Merrimack Engineering Services. Received January 8, 1999, o A Form C - an application for Approval of Definitive Plan referencing "Me Sanctuary in North Andover Massachusetts dated December 14, 1998. • A Notice of Intent for St.Michael's Church, Salem Street, located in North Andover, Massachusetts,dated December 1998. • "Storm Water Report" dated November 11, 1998. Prepared by Merrimack Engineering Services. Received January 7, 1999. Our current comments are as follows: Planning Board Rni lAtiiona: 1. Seot#an 3.)a.)A completed Form D was not submitted. 2. Section 3.)c.) Test pit data was not submitted. Although the site is to be served by a municipal sewer system, test pits should be performed by a licensed soil evaluator and witnessed by a town representative, to determine high ground water elevations and soil conditions at stormwater management facilities. 3. Section 3.)d.)A drainage analysis has been provided, but has not yet been reviewed. 4. Section 3.)k.)l 1.)Spot grades should be indicated at low points and flat areas. 101 Accord Perk Drive 781-982.5400 Norwell, MA02061-1685 Fax: 781-962-5490 ' 1 S. Section 3.)k.)m.)Locations of percolation tests and results were not indicated or submitted. 6. Section 3,)k.)19.)Off site locations of existing septic systems or private wells, if any, are not indicated on the plans. We appreciate the opportunity to assist the Planning Board on this project and hope that this information is sufficient for your needs. We would be pleased to meet with the Board or the design engineer to discuss this project at your convenience. If you have any questions please do not hesitate to contact us. Very truly yours, COLER&COLANTONIO,INC. John C. Chassis,P.E. xc Merrimacl Engineering Jim Rand 1 L L 1 V 1 1 i F-NGGNFGRS AND gt_IEN71g713 January 26, 1999 Mr. Michael Howard Conservation Commission 27 Charles Street North Andover,MA 01845 RE: Engineering Review The Sanctuary Notice of Intent Dear Mr.Howard; In response to your request, Coler & Colarktonio, Inc. has reviewed the submittals for the above referenced site. This additional information has been reviewed for conformance with the North Andover Wetland Protection Regulations.'Me submittal includes the following information; Plans Entitled • "Definitive Subdivision Plan - The Sanctuary located in North Andover, Mass." Consisting of ten sheets dated 3/31/98, last revised 12/2/98, Prepared by Merrimack Engineering Services, Received January 7, 1999. a "Pre and Post Doveloptttent Subarea Plans", two sheets dated 10116/99, Prepared by Merrimack Engineering Services, Received January 8, 1999. e A Form C - an application for Approval of Definitive Plan refereneing "The Sanctuary in North Andover Massachusetts dated December 14, 1998, ® A Notice of Intent for St.Michael's Church, Salem Street, located in North Andover, Massachusetts,dated December 1998. ® "Storm Water Report" dated November 11, 1998. Prepared by Merrimack Engineering Services, Received January 7, 1999. Our comments are as follows: Wetlands Protection Regulations Section IV-)A.)Stormwater Management Standards should be met to the extent practicable: Section IV.)B.): StandKd I Satisfactorily addressed, grid_and 2 Peak Rates are equal under pre and post construction conditions, except at Design Point 2, which shows a slight post development increase, The one your 24 hour storm should be modeled. i 101 AccorO Paris Drive 781-482. 4400 Norwell, MA02061-'1605 Pax: 781-982-5490 I i Reduced storage capacity of the proposed constructed wetland may increase post development runoff rates.The storage capacity includes a volume below the invert elevation,which could be in the water table. Test pits consistent with this section should be performed to provide an accurate estimation of the high groundwater elevation. Standard 3 It is not clear that there is adequate groundwater separation for the proper function of the proposed infiltrator systems. Test pits to determine groundwater elevation and soil pemeability should be performed by a certified soil evaluator and witnessed by an agent of the town. tandard 4 Street sweeping credit should be confirmed by town staff. It is unclear that sweeping will occur on a frequent basis to comply with the criteria. This may impact the TSS results, Tho proposed wet pond should be designed to meet time design requirements in the DEP Stormwater Management Policy. Inlet and outlet structures are too close to provide adequate detention time. A detail of the proposed wet ponds indicating the method of water retention should be included.Planting plans for wet ponds should be included. StA adard S The water quality volume calculation should include the total of all impervious surfaces. It is estimated that approximately l acre olfthe proposed site is impervious. 2-Andard S Not applicable. Standard 7 Not applicable. 5tatmdard B Not applicable. Standard Typically reviewed by Town Staff,we note: Erosion control measures should be included at time south west corner of the site between Lotl and Salem Street. Section IV.)l.)Mininmutmm Submittal Requirements b.)Design criteria for BMP's should be indicated. Erosion control measures should be included at the south west comer of the site between Lotl and.Salem Street. 1 3 i 1 Section 1V.)C.)Flood Control Standards 2. Existing and proposed 100-year flood elevations should be modeled for ponds and wetlands impacted by proposed construction. I 6b.It is recommended that bar racks be placed on all inlet and outlet structures. 6c. The plans do not indicate riprap placement at outlets. It is recommended that rip rap be properly sized and placed at discharge points to avoid scouring and erosion. 6d. Storage capacity of the proposed constructed wetland may not comply with this section. Test pits consistent with this section should be performed to provide an accurate estimation of'the high groundwater elevation.Test pit data was provided only at inlet Station 4+50. Section VI.)B.)4.)i.) Existing and proposed. 100-year flood elevations should be modeled for ponds and wetlands impacted by proposed construction. Section VI,)B,)4,N,) Hydrologic calculations showing the full flow capacities and velocities for all open and closed water courses w' p u.ses flowing onto and off the site. Section VI.)B.)6.)b.)The depth to seasonal high groundwater in the area of the proposed wetland is not indicated. Additional Comments- Spot grades around the ponds and swale should be included on the plans. The driveway for lot 5 is graded such that runoff from the proposed roadway will discharge into this driveway. It is recommended that a crown be provided between the driveway and roadway. There is an indicated 0.5 efs increase in the I00-year post construction peak flow from SC 3 to the existing catch basin on Salem Street (SP 2 ). It is unclear if the existing street system has adequate capacity, We appreciate the opportunity to assist the planning Board on this project and hope that this information is sufficient for your needs. We would be pleased to meet with the Board or the design engineer to discuss this project at your convenience. If you have any questions please do not hesitate to contact us. Very truly yours, COLER&COLANTONIO, INC. t John C. Chessia,P.E. Xc Mouimack Engineezinb Jim Rand i f 1 L U Z ENG1N1'6Rq AND SCIGN11S;Y3 January 29, 1999 Ms,Kathleen Colwell Planniog l]irector 27 Charles Street North Andover,MA 01845 M� Engineering Review The Sanctuary Residential Subdivision Definitive.Plan Dear Ms.Colwell, In response to your request, Cofer& Colantonio, Inc, has reviewed the submittals for the above referenced site. We have previously reviewed the project under the checklist aspect of the requirements. This additional information has been reviewed for conformance to the "Rules and Regulations Governing the Subdivision of Land" in North Andover. The submittal includes the following information: Plans Entitled s "Definitive Subdivision flan - The Sanctuary located in North Andover, Mass." consisting of ten sheets dated 3/31/98, last revised 12/2/98, Prepared by Merrimack Engineering Services. Received January 7, 1999. ® "Pre and Post Development Subarea .Plans", two sheets dated 10/16/99, .Prepared by Merrimack Engineering Services. Received January 8, 1999. ® A Form C - an application for Approval of Definitive .Plan referencing "The Sanctuary in North Andover Massachusetts dated December 14, 1998, • A Notice of Intent for St. Michael's Church, Salem Street, located in North Andover, Massachusetts,dated December 1998. ® "Storm Water Report" dated November 11, 1998. Prepared by Merrimack Engineering Services. Received January 7, 1999. Our current comments are as follows: Definitive Subdivision Regulations: Section 7.)A_)L)g.) The centerline relationship between Abbott Street and the proposed Keyes ay should be indicated on the plans. action 7.)A.)I.)h.) A waiver is being requested for minimum centerline radii of 125 feet in lieu of 150 feet. Section 7.)A,)3.)c.) K values should be indicated for vertical curves, however the curves seem acceptable. tot Accord Park Drive 761-982-5400 Norwell, MA 02061-1685 Fax. 781-982-5490 V 1 vSection 7.)A.)4.)A.) A waiver is being requested for a maximum length of dead end street of 661.71 feet in lieu of 500 feet. Section 7.)B.)4.) A waiver is being requested for an allowance to offset the centerline of pavement from the centerline of the right-of-way width a minimum centerline radius of 112 feet in lieu of coincident contorline. seation7.)C.)1.) A waiver has been requested for a 3' min. shoulder width, however the road l" cross section indicates a 4' min. shoulder width. ction 7.)D.)1.)A waiver is being requested from the requirement to construct sidewalks. Wetion 7.)E.)1.)A waiver is being requested front the requirement to plant street trees. <\Section 7.)L.)4.) A waiver is being requested for the proposed watermain to be installed 20 feet &m the south side of right-of-way in lieu of 15 ;feet from the north or cast. Section 7.)N.)4.) Catch basins should be linked by manholes and located at low points. Catch Basins land 2 do not meet this requirement. Section 7.)N.)l1.) Velocity calculations for the proposed triple 24" RCP drainpipes located at approximately Station 2+15, should be provided. Appropriate scour and erosion controls for this proposed culvert i.e. rip rap, should be detailed on the plans. Section 7.)N.)12.) The minimum depth of cover should not be less than 30". The proposed 18" RCP drain pipe between;DMH 1 and DMH 2 is approximately 24". We have attached our review of the Notice of Intent, which further outlines our drainage commence. We appreciate the opportunity to assist the Planning Board on this project and hope that this information is sufficient for your needs. We would be pleased to meet with the Board or the design et"ineer to discuss this project at your convenience. If you have any questions please do not hesitate to contset us. Very truly yours, COI:.l?R&COLANTONIO,INC. ohn C. Chessia, P.E. xc Merrimack Engineering Jim Rand