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Home My WebLink About1998-04-10 Engineer Review SPR L CON10 2 FACSIMILE COVER SKEET To: Kathy Colwell Company: Noah Andover Plwming Board Phone: 978-688-9535 Pax: 978-688-9542 From: John C. Chessia Company: Coler & Colantonio, Inc. Phone: 781-982-5400 Fax: 781-985-5490 Date: February 24, 1999 Pages including this cover page: 1 Comments: hi o acts Recalved Orchard Hill Road February 23, 1998 Channel Building Co. February 23, 1998 S. Bradford Street(told to hold review) February 23, 1998 Exleting projects RaeelyRd _ Berrington Place February 19, 1998 additional information for Lot 2 Layout—complies with section 71. Awaiting rest of information to finish review. i Lots 4& 5 Willow Street-Site Plan Review 1. Application/Fee/Abutters list submitted 2. Drawings at 1"=40'certified by registered professional engineer submitted 3. North Arrow/Location Map(1"=1500') submitted 44l 1�. 4. Survey of the Lot/Parcel submitted 5. Name/Description of Project:need names,addresses and telephone numbers of the project tenants,description of the proposed tenant 6, Easements/Legal Conditions submitted 7. Topography: submitted 8. Zoning Information: submitted 9. Storm water Drainage Plan: JC to review 10. Building(s)Location submitted 11. Building Elevation: submitted U. Location of Parking/Walkways:Parking spaces should be 9'x 181,no compact spaces allowed 13. Location of Wetlands: need confirmation from ConCom 14. Location of Walls/Signs submitted 15, Location of Roadways/Drives:Is driveway all around the building required?Necessary? 16. Outdoor Storage/Display Area none shown 17. Landscaping Plan(1 tree every 30') submitted 18. Refuse Areas: 10'x 10' trash enclosure(6'stockade fence) submitted 19. Lighting Facilities: to be submitted 20, Drainage.Basin Study N/A 21. Traffic Impact Study: information on the type of truck traffic to be submitted, hours of operation, f# of employees 22. Commonwealth Review:Any state permits required? 23. Utilities:to be reviewed by DPW 24, Fiscal Impact not submitted 25. Community Impact not submitted JryI J I i COL ' R& f " �5RO COLA (TON10 2 f FACSIMILE COVER SHEET To: Kathleen Colwell Company. North Andover Planning Board Phone: 978-688-9535 Fax: 978-6 88-9542 From: John C. Chessia Company: Coler& Colantonio, Inc. Phone: 781-982-5400 Fax: 781-982-5490 Rafe: April 3, 1998 Pages including this cover page: 5 Comments: Attached is the Supplemental Site Review for Willow Street South Extention. cc:MHF Design Consultants 603.893.0733 Jinn Rand,DPW 978-688-9573 CO - I ENGINE=r2RS AND SC19NTiS-r$ i April 3, 1998 Ms.Kathleen Colwell Planning Director Town Hall Annex 30 School Street North,Andover, MA 01845 RE: Supplemental Engineering Review Willow Street South Extension Dear Ms. Colwell- In response to your request, Coler& Colantonio, Inc. has reviewed the revised Site Pleats for the above referenced site. This correspondence follows the comment numbering system of our previous letter dated March 11, 1998. In addition, we visited the site on March 27, 1998 to observe the existing conditions. The revised submittal package included the following information: Plans Entitled: "Willow Sheet South Extension"nine sheets dated December 19, 1997, Prepared by MHF Design Consultants, Inc. Revised March 20, 1998. Received March 24, 1998. e "Proposed R&D Facility: Elevations"one sheet dated December 15, 1997,Prepared by Channel, Wilmington,MA. Revised January 8, 1998. Received March 24, 1998. Reports Entitled ® "Stormwater Management",Prepared by MHF Design,Consultants,Inc. Received March 24 1999. Our current comments are found in italics. Information Required, Zug Bylaws 1. Section 8.3) 5.)e.)i.)The location map is not at the scale of 1" = 1500'. Satisfactory. 2. Section 8.3) 5.)e.)v.)There is a proposed contour missing on the north side of the property(sheet 4 of 8). The grade 242 enters the retaining wall and never comes back out. Satisfactory. 101 Accord Park Drive 781 962.5400 Norwell. MA 02061-1685 Fax: 781-982-5490 i 3. Section 8.3) 5.)e,)vi.) See drainage issues below. 4. Section 8.3) 5.)e,)x,)The Building Inspector should review the plans for ADA, cornpliance. No further comment. 5. Section 8.3) 5.)e.)xiii.) Any access driveways on the South side of Flagship Drive should be indicated. No further comment. 5. Section 83) 5.) e.)xv,) The plan does not indicate an existing tree line. Satisfactory 7. It is our understanding that Sections 8.3)5.) e.),xix,xx, xxii,xxiii, are typically reviewed by Town Staff. No further comment. Drainage Issues 8. Subarea plans were not in,our calculation package. We could not evaluate the drainage areas,curve numbers and times of concentration without the plans. We have contacted MHF Design Consultants, Inc. to supply these plans. Plans have been Provided No further comment. 9. Information should be provided on the inlet capacity of catch basin grates. Since the parking lot has a slope toward Catch Basin 1, by pass of the grates in larger storm events would result in runoff overflowing the five-foot concrete walks. Grading beyond the sidewalk should be directed toward the north side of the drainage basin, Satisfactory. 10. The drainage basin as designed will hold one foot of standing water. The invert.out of the detention basin conflicts between the drawing and the calculations. The calculations show the new design having an outlet at a bottom elevation of 241.50. We recommend that the basin provide a positive pitch to the outlet. 11. Typically connections are not allowed into street catch basins. The design has been revised to have an outlet structure to drain the detention hasin into a channel and then into the wetlands, 12. We recommend that stormwater facilities be designed constant with the requirements of ASCE Manual and Reports of Engineering Practice No. 77 and the DEP Stormwater Management Policy. The drainage basin berm is three feet wide, which is not consistent with these design standards. The basin berm has been widened to eight feet. 13, An emergency overflow spillway for the detention basin should be designed for larger storm events in the occurrence that the outlet structure is plugged with debris. This spillway should be sized to pass a 100-year storm with the outlet plugged. We suggest the spillway be located at the western side of the detention basin to allow for emergency discharge into the wetlands, Satisfactory. 14. A clean out is needed on the outside perimeter of the loading docks, The pipe flow changes direction at that location, Satisfactory. 15. Vest pit data was not provided at the location of the grass Swale. With the soil conditions found throughout the rest of the site,the soil does not appear to be suitable for infiltration. A detail along with calculations of the grass swale and its adequacy should be provided. See standard 4 below, 16. Catch basins 1 and 2, along with Drain Manhole I (DMH1) flow into Drain Manhole 2 (DMH2). Catch basin 2 and DMHI enter DMH 2 at the same elevation A d at an angle greater than 90 degrees. We recommend that the storm drain layout be revised to eliminate changes in direction of over 901. Satisfactory, Stormwater Management Policy The Stormwater Management Form was not submitted with this set. It is unclear if the Conservation Commission received this form. Standard 1, Satisfactory. Standard 2. Post development peak discharge rates do not exceed the pre-developed rates at the design point for any of the storms. Subarea plans were not in our calculation package. We could not evaluate the drainage areas,curve numbers and times of concentration without the plans. Satisfactory. Standard The recharge volume for Soil Group D is waived. No further comment. Standard 4 Street sweeping is discretionary subject to the Conservation Commission approval. It is the unclear that sweeping twice a year is adequate. The Conservation Commission should receive acceptable assurances that the proposed sweeping will take place. It is unclear if the detention basin has adequate detention time to meet the requirements for the Extended Detention Basins. A drain valve should be installed in the outlet structure of the basin to ensure that the basin can be drained completely. Maintenance access should be provided, structures should be accessible to maintenance personnel during normal and emergency conditions. Additional data should be submitted to support these requirements. Satisfactory, Additional information is required to determine the conformance of the water quality swale to DEP design criteria, Water quality swales should be sized to retain the entire runoff volume, calculations should be provided to verify adequate storage has been provided. We recommend a cross section be supplied ,As currently indicated the contouring is incomplete. We recommend standard DEP TSS removal rate sheets should be submitted. Standard The proposed building is referred to as a Research and Development building. It is unclear as to what type of research will be conducted in the structure, and therefore it is unknown as to whether or not it meets standard 5. No further comment. Standard 6 Not applicable. StAndard 7 Not applicable. Standard 8 & Standard 9 It is our understanding that Town Staff typically reviews Standards 8& 9. No further comment. 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 trwy yours, COLER& COLA.NTONIO,INC. John C.Chessia,RE. CC' MHF Design Consultants, Inc. Jim Rand,DPW i C L & CCILANTONIOZ GNO1 yeeRs Arvo 5QIE vr,$7-Z May 7, 1998 i Ms.Kathleen Colwell Planning Director Town Hall Annex 30 School Street North Andover,MA, 01845 RE: Supplemental Engineering Review Willow Street South Extension Dear Ms. Colwell: In response to your request, Coler & Colantonio, Inc, has completed a final review of the revised Site Plan for the above referenced site. The submittal package included the following; Plan Entitled; • "Willow Street South Extension"one sheet dated December 19, 1997,Prepared by M1F Design Consultants,Inc.Revised April 10, 1998.Received April 1.3, 1998. • "Swale Storage Volume Calculations", one sheet dated April 10, 1998,Prepared by MHF Design Consultants, Inc. Received April 13, 1998. 1. Tktc revised design of the detention basin indicates a positive pitch and the basin outlet:does not conflict with the calculations. We have no further comments. We appreciate the opportunity to assist the Planning board on this project and Dope 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. Jo,hnl C. Chessia,P.E. cc: MIS'Design Consultants,Inc. Jiro Rand,DPW 101 Accord Park Dave 781 992-6400 Norwell, MIA 02061-1685 Fax: 781-982-5490