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Home My WebLink About2018-02-20 Civil Review 65 Glenn Street 169 Ocean Blvd. U Lawrence,MA 01843 1nit 101, PO Box 249 Hampton, NH 03842 T T:978.794J792 T:603.601.8154 Th e E n g!nee r i n g C o rp.co ni ANEW Ms. Jean Enright January 2, 2018 Planning Director Town of North Andover 120 Main Street North Andover, MA 01845 Ref. T0758.01 Re: Land Disturbance Permit— Mill Road &Johnson Road (Lots 1A, 1B 2A & 2B) Civil Engineering Peer Review Dear Ms. Enright: On behalf of the Town of North Andover, TEC, Inc. reviewed documents as part of the civil engineering peer review for the proposed project to be located at Mill Road &Johnson Road (Lots 1A, 1B 2A & 2B). Sullivan Engineering Group, LLC ("Applicant'% submitted the following documents, which TEC reviewed for conformance with the General Bylaws of the Town of North Andover and the North Andover Stormwater Management and Erosion Control Regulations: • Land Disturbance Permit Application — prepared by TKZ, LLC, not dated; • Plan of Subsurface Sewage Disposal System, prepared by Merrimack Engineering Services, dated September, 10, 2016, revised June 6, 2017; • Site Construction Details, prepared by Sullivan Engineering Group, LLC, dated December 13, 2017; • Stormwater Management Plan — prepared by Sullivan Engineering Group, LLC, dated November 16, 2017; • Construction Storm Water Pollution Prevention Plan — prepared by Sullivan Engineering Group, LLC, dated November 16, 2017; and • Operation and Maintenance Plan — prepared by Sullivan Engineering Group, LLC, dated November 16, 2017. Upon review of the documents and plans, TEC has compiled the following comments for the Board's consideration: 1. Section 7.1.h — it appears that some of the submitted plans are illegible. The Applicant should revise plans to clearly demonstrate all existing and proposed line work, dimensions, texts, etc. TEC recommends the Applicant include a legend demonstrating existing and proposed lines/symbols. 2. Section 7.1.n —The Applicant has not provided existing and proposed vegetation on the site. 3. Section 7.1.p—The Site Plans do not clearly depict the pre and post construction watersheds, subwatersheds and stormwater flow paths. The Applicant should provide separate plans demonstrating the pre and post construction watersheds and stormwater flow paths in accordance with this Section. Plan I Permit I Design I Construct T:\T0758\TO758.01\Docs\Letters\TO758.01—Peer Review.docx Mill Road &Johnson Road (Lots 1A, 1B 2A & 2B) Civil Engineering Peer Review— Land Disturbance Permit January 2, 2018 Page 2 of 2 4. Section 7.1,r—The Applicant should perform a test pit in each of the proposed drainage infiltration systems to ensure adequate separation to estimated seasonal high groundwater. 5. Section 7.1A—The Applicant should provide further detail for the proposed drainage infiltration systems. The Applicant should show roof drains connecting into the drainage infiltration systems and provide details. Drawings should be provided for the infiltration systems consistent with Section 7.1.t. 6. Section 7.1 —A locus map at a scale of 1"-800; should be provided. Furthermore, names of abutters should be provided on the site plans. 7. Section 7.2.B.d —The Applicant should demonstrate the locations of the designated control points utilized in the HydroCAD Analysis. 8. Section 8.0 —The Applicant should provide an Erosion and Sediment Control Plan and include all required details described in Section 8 of the North Andover Stormwater Management and Erosion Control Regulations. 9. Proposed soil stockpiles should be relocated so they are not directly on top of the proposed infiltration systems. 10. It appears that the Applicant is proposing to infiltrate stormwater within 50'of the proposed septic tank/leaching field systems; the Applicant should revise the plans to ensure a fifty (50') foot minimum separation between infiltration and leaching systems to be in compliance with the Massachusetts Stormwater Handbook. 11.The project is proposing septic systems that will require review and approval by the Town of North Andover Board of Health. 12.The Applicant should include a section in the stormwater report to document how each proposed lot within the project complies with the 10 standards in the Massachusetts Stormwater Handbook. If you have any questions regarding the peer review, please do not hesitate to contact us at (978) 794-1792. Thank you for your consideration, Sincerely, TEC, Inc. Urhe Engineering Corporation" Peter F. Ellison, PE Senior Civil Engineer T:\T0758\TO758.01\Docs\Letters\TO758.01-Peer Review.doa ` ^ os Glenn Street un Ocean| � �6�^»n 7 249 m*eu�,nxuuwa . on, wn 038*2 T:978.794.1792 T*03.601.8154 ThoEngineedngCorp.com ANEW Ms. ]ean ,Enright January 17/ 2O18 P|@ROiDg Director Town of North Andover 120 MO|D Street North Andover, MAO1845 Ref. T0758.01 Re: Land Disturbance PerrniL— Mill Road &]ohnson Road (Lots 1/, 1B 2A &2BA Civil Engineering Peer Review #2 Dear Ms. Enright: On behalf of the Town of North Andover, TEC, Inc. reviewed documents as part of the civil engineering peer review for the proposed project tVbe |ocatcdatMiURnad &]uhOnonRoad /Lots1A' 1B2A &220. Sullivan Engineering Group, LLC C'Applicant"), Submitted the following documents, which TEC reviewed for [oDforD0aDC8 with the General Bylaws of the Town of North Andover and the North Andover Sto[mnvVater Management and Erosion Control Regulations: ° Response tuComments Letter; prepared by Sullivan Engineering Group, LLC/ dated January 9, 2018; ^ Pre Development Drainage Plans— Luis 1A/ 1B~ 2A &ZB; prepared by Sullivan Engineering Group, LLC/ dated January 8/ 2U18; * Post Development Drainage Plans— Lots 1A/ 1B, 2A &2B; prepared by Sullivan Engineering Group, � LUC, dated January 8/ 2O18) ° Erosion (kSedimentation CQMtFO1 Plans— Lots 1A, 18, 2A Qk2B} prepared by Sullivan Engineering Group, LLC/ dated January 8, 2O18} ° Site Construction Detai|S— p[epaKed by Sullivan Engineering Group, LLC, dated December 13, 2017/ revised January 8/ 2U1B. For consistency, the outstanding original comment numbers have been retained from the most recent TEC review letter dated January 2, 2018. The Applicants response to comments is shown as bold; TEC response are shown aoitalic. 1. Section 7.1.h — it appears that some of the submitted plans are illegible. The Applicant should revise plans to clearly demonstrate all existing and proposed line work, dimensions, texts, etc. TEC recommends the Applicant include a legend demonstrating existing and proposed lines/symbols. Applicant Response: The plans were prepared as an overlay to existing pdfpyams (by others) of the approved septic systems for these four lots.The quality of the plans is the best that can beobtained. ��Aoresponse 2. Section 7.1.n —The Applicant has not provided existing and proposed vegetation oD the site. Plan I Permit I Design I {bnstruct T:\rOv5$T07sm.O1Umocsyauro\nO758.U1_M|U Road Peer Review#u.dou Mill Road &Johnson Road (Lots 1A, 113 2A & 26) Civil Engineering Peer Review #2 — Land Disturbance Permit January 17, 2018 Page 2 of 4 Applicant Response: Due to the time of season and snow cover it is impossible to determine existing site vegetation.An existing tree inventory of the 4 properties was not completed. Areas within the limit of work line would have existing trees removed, but is willing to walk the site in the spring with the Town Planner to determine specimen trees that could be saved within the work area.The proposed landscaping for these four lots will be conventional single family landscaping methods consisting of lawn areas and mulch beds/plantings around the houses. TEC. TEC agrees with the Applicant If amenable to the Board, a spring site walk to determine trees to be saved could be considered as a condition of approval. I Section 7.1.p—The Site Plans do not clearly depict the pre and post construction watersheds, subwatersheds and stormwater flow paths. The Applicant should provide separate plans demonstrating the pre and post construction watersheds and stormwater flow paths in accordance with this Section. Applicant Response: Revised Predevelopment and Post development drainage plans has been prepared to better demonstrate the watershed areas,subcatchment areas, Stormwater flow paths (time of concentration flow lines), and proposed drainage mitigation (for the Post development scenario). The full drainage Study involved the area of disturbance on each lot. Design points are clearly labeled. TEC• Comment Addressed. 4. Section 7.1.r—The Applicant should perform a test pit in each of the proposed drainage infiltration systems to ensure adequate separation to estimated seasonal high groundwater. Applicant Response: Test pits were performed on all 4 properties by others and witnessed by the North Andover Board of Health for the approved septic system locations.The proposed drainage infiltration fields are all approximately SO feet from soil testing location and the infiltration rates used for the drainage system is consistent with the percolation rates established. Estimated seasonal groundwater was established on each lot (by others) and these values were used in the drainage design to ensure a minimum 2 foot vertical separation between the water table and the bottom of the drainage system. TEC•According to Volume 3, Chapter I of the Massachusetts Storm water Handbook, a Title 5 percolation test is not an acceptable test to determine the design infiltration rate(Saturated hydraulic conduch vity)for a stormwater Best Management Practice. TEC recommends that the Applicant revise the stormwater calculations using the infiltration rates listed in Table 2.3.3 of Volume 3 of the Storm water Handbook based on the textural analysis that was performed for the Soil Absorption System. 5. Section 7.1.t—The Applicant should provide further detail for the proposed drainage infiltration systems. The Applicant should show roof drains connecting into the drainage infiltration systems and provide details. Drawings should be provided for the infiltration systems consistent with Section 7.1.t. Applicant Response: Although the final house plans have not been developed for these four lots, roof drain connections have now been shown on the Site Plans. Additionally, on the Construction Detail sheet a cross section has been provided showing how the roof drains T:\T0758\TO758,01\Docs\Letters\TD758.01_MilI Road Peer Review#k2.docx Mill Road &Johnson Road (Lots 1A, 1B 2A & 213) Civil Engineering Peer Review #2— Land Disturbance Permit January 17, 2018 Page 3 of 4 will connect to the infiltration field. Also, a detail has been provided for the roof drain connections showing an emergency overflow to a splash pad for storms that may exceed the 100 year storm event. TEC., The infiltration system on Lot JA is proposed with a "top of unit"elevation of 225.9. The proposed grade at the location of the system is approximately 224 The infiltration system would protrude above glade by about 2 feet, The Plans should be revised to account for the system. 6. Section 7.1 —A locus map at a scale of 1"-800; should be provided. Furthermore, names of abutters should be provided on the site plans. Applicant Response: The locus map at a 1"=800' has been attached to his letter. Names of the abutters are shown on the Site Plans. TEC.• Comment addressed 7. Section 7.2.B.d —The Applicant should demonstrate the locations of the designated control points utilized in the HydroCAD Analysis. Applicant Response: All design control points have been labeled on the Pre & Post Development stormwater plans. TEC., Comment addressed. 8. Section 8.0 —The Applicant should provide an Erosion and Sediment Control Plan and include all required details described in Section 8 of the North Andover Stormwater Management and Erosion Control Regulations. Applicant Response: The Erosion and Sediment Control Plans have been revised to show all critical design features including soil stockpile areas, construction entrance,erosion control barriers, drainage features, and limit of work. TEC., Comment addressed. 9. Proposed soil stockpiles should be relocated so they are not directly on top of the proposed infiltration systems. Applicant Response: All soil stockpile areas have been reviewed and relocated as needed to avoid any conflict with the infiltration systems. TEC, Comment addressed. 10. It appears that the Applicant is proposing to infiltrate stormwater within 50'of the proposed septic tank/leaching field systems; the Applicant should revise the plans to ensure a fifty (50� foot minimum separation between infiltration and leaching systems to be in compliance with the Massachusetts Stormwater Handbook, T:XT0758\T0758.01\Docs\Letters\T0758,01—MilI Road Peer Review W2,docx Lob Mill Road &]0hDs0n Road (Lots 1A. 1B 2A & ZFA Civil EDg|O88hDg Pee[ Review #2— Land Disturbance Permit January 17/ 2Q18 Page 4Of4 Applicant Response: The drainage infiltration fields for all four properties have been reviewed and relocated as required bm maintain a minimum 50 foot separation for any septic leaching field facility. 7EC (3omVnent paltlally addiessed, zx8sse see comment#/3below 11. The project|Sp[opVmiOgseot|csy3kennsthatVV||| [eqV|[ereVieVvaDdapp[OvalhviheT0VYDofNorth Andover Board of Health. Applicant Response: The North Andover Board of Health has reviewed and approved the septic design plans. �� Comment acldhssed. 12. The App||cant should include a section |Uthe sUornlVV8t8[ report ho document how each proposed lot within the project complies with the 10 mtaDdmkjS in the Massachusetts Sb)rmVvater Handbook. Applicant Response: Attached is the completed SWormnVVaberRepm,t detailing the 10 sbormmvmater standards. �� The Applicant did motaddhess how the project DeetS Slamdald 4 mlabd/n T55 removal for the driveway runoff ofaV lots, TEC has also identified the following comments to be addressed by the Applicant: 13. The Applicant has relocated the subsurface infiltration systems to be more than 50 feet from the uoi| absorption system; however, the porous pavement |S also considered an infiltrating device. Porous pavement has a setback requirement of 50 feet from soil_absorption systems, per Volume 2 Chapter 2 of the Massachusetts Sto[0YvaterHandbook, The Plans should b8 revised tu provide aS0 foot setback, or provide different type ofskzr/Dwabe[treatment and infiltration for the driveway runoff. 14. The sto[[nVvDtercalculations use o time of concentration of542 minutes /9 hours) for the proposed driveway subcatzhnnaOts. The Applicant should dar|h/ if this was a mistake, or provide calculations to back Up this assumption. If you have any questions regarding the peer review, please do not hesitate to contact Us at (978) 794- 1792. Thank you for your consideration. Sincerely, TE{, IDc. "The Engineering Corootatlonll PeterF. Ellison, PE Senior Civil Engineer T:\075$\r07S8.Oz\ouu\Lucrs\r75O.U1_MU|Road Peer Review#I.doox �V � �� 1/30/2018 T""own of North Andover Mail-Mill/Johnson Rd Comments 177 NORTH' ,ANDOVER �M2ssachustdts Monica Gregoire <mgregoire@northandoverma.gov> Mill/Johnson Rd Comments Peter Ellison <PEllison@theengineeringcorp.com> Tue, Jan 30,2018 at 4:00 PM To: Monica Gregoire <mgregoire@northandoverma.gov> Hi Monica, After reviewing the latest plans, I have one final cornment: The Applicant should provide a construction detail for the proposed bioretention areas consistent with the MassDEP Guidance in Volume 2 Chapter 2 of the Massachusetts Stormwater Standards. The detail should include a 2' minimum separation to groundwater. Where a groundwater separation of 2' is not possible,an impermeable liner should be installed beneath the system. If this comment is agreeable to the Board, I think it would acceptable to make this a condition of Approval. Thank you, Peter Peter Ellison, PE Civil Engineer "THE:ENGINEERINGGGRPX0MF1 978-794-1792 From: Monica Gregoire [malito:mgregoire@northandoverma.gov] Sent: Tuesday,January 30, 2018 9:03 AM To: Peter Ellison Subject: Re: Mill/Johnson Rd Comments [Quoted text hidden) https://mail.google.comlmail/u/0/?ui=2&ik=dadd 1872e7&jsver-n5lS-ZI kXEE,en.&view=pt&msg=16148defa343822c&search=inbox&type=161490c1 c32... Ill 2/6/2018 Town of North Andover Mail-Re:Mill/Johnson Road-Land Disturbance-Revised flan Set NOR H" ANDOVER Massac�us is ,r Monica Gregoire <mgregoire c�i7northandoverrna.gov> Re: Mill/Johnson Road - Land Disturbance - Revised Plan Set Peter Ellison <PEllison@theengineeringcorp.com> Tue, Feb 6,2018 at 8:49 AM To: Monica Gregoire<trtgregoire@northandoverrna.gov> Cc: Jean Enright<jenright@northan dove rma.gov> Hi Monica, All of TEC's comments have been addressed. Thank you! Peter Peter F. Ellison, P.E., Civil Engineer T 978.794.1792 x1036 I C 978.815.0958 pellisowi@theengioeerltigcorp,00m TEE7 ff I Im Paa 'p xraooa�rw�pCoto From: Monica Gregoire [i-na!Ito:tiigregoire@northaridoverrna.gov] Sent: Monday, February 05, 2018 9:34 AM To: Peter Ellison Cc:Jean Enright Subject: Fwd: Mill/Johnson Road - Land Disturbance - Revised Plan Set [Quoted text hidden) https:Nmail.google.corn/mail/u/o/?ui=2&ik=dadd 1872e7&jsver=YY-up6gcTQI.en.&view=pt&msg-1616b6Od4dd316ba&search=inbox&siml=1616b6dd4d... 1/1