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HomeMy WebLinkAbout2022-04-05 Stormwater Peer Review 3/28122,9:05 AM Town of North Andover Mail-Re:229 Brentwood Circle,NA_Walershed Submittal-Arch.Plans NORPJ ANOOVER Massachus�ts Jean Enright<jenright@northan dove rma.gov> m Re. 229 Brentwood Circle, NA _ Watershed Submittal- Arch. Plans Jack Sullivan <jacksu1153@corncast.net> Fri, Mar 25, 2022 at 11:07 AM To: Jean Enright <jenright@northandoverma.gov>, Bonnie Wolstromer<bwolstromer@northandoverma.gov> Cc: Steve Stanish <sstanish@horsleywitten.com>, "gena.hatch @comcast.net" <gena.hatch@comcast.net>, Jimmy D'Angelo PE <jdangelo@dangelo-engineering.com>, Janet Bernardo <jbernardo@horsleywitten.com> Hi ,Jean, Bonnie, and Horsley Witten Group members: I reviewed the March 8, 2022 memo from the Horsley Witten Group and offer the following changes/additions to address the review comments. 1) The area drain has been eliminated from the project. The owner is able to re-grade the area to eliminate the need for an area drain. Much of the 3-8-2022 review memo involved comments on the area drain. 2) A detail of the 4" NDS pop-up emitter has been added to the plan. 3) Additional erosion control, in the form of a 12" staked mulch soxx has been added around a portion of the soil stockpile area to enhance protection measures. 4) Four (4) trees have been shown and identified for removal on the plan. A 4", 12" and 6" hardwood tree and a 12" pine tree to be removed. 5) A full basement is proposed for the addition (previously a crawlspace) 6) No dewatering anticipated 7) Water and sewer services shown...no gas service to show 8) Limit of disturbance has been labeled on the Site Plan equal to erosion control barrier limit 9) O&M updated to include inspection of NDS pop-up emitter & inspection log (signed by owner) 10) An erosion and sediment narrative is provided. 11) All erosion barriers are set outside the 100 foot setback to the wetlands (on previous plan I mistakenly had placed erosion barrier about 80 feet from the wetlands). I think this covers everything. I have a site walk on 3/29 at 1:00 pm with Taylor Andrews of Conservation to review the wetland line...on this site it is pretty clear being a bottom of slope throughout... If anyone needs paper copies of materials please let me know quantity to provide...the owner is copied and will drop copies. Thank you everybody.,. Sullivan Engineering Group, LLC Jack Sullivan P.O. Box 2004 Woburn, MA 01888 781-854-8644 (Quoted text hidden) 3 attachments Site Plan_03252022.pdf 708K " O&M Plan -229 Brentwood Circle, NA 03252022.pdf https://mail.google.comlrnail/u/2/7ik=7c2eff62B5&view=pt&search=al l&permmsg id=msg-f%3A1728284850748012758&simpl=msg-f%3Ai 7282848507... 112 3/28/22,9:05 AM Town of North Andover Mail-Re:229 Brentwood Circle,NA, Watershed Submittal-Arch, Plans 975K Erosion and Sediment narrative-03252022.pdf Vj 74K httpsalmail.google.com/mail/ul2/?ik=7c2off6265&view=pt&search=atl&permmsgid=msg-f%3A1728284850748012758&simpi msg-f%3Al7282848507... 2/2 4/4/22,8:41 AM Town of North Andover Mail-RE:229 Brentwood Circle,NA, Updated Plan per Conservation Agent Site Walk i'UORp ANO,OVER Massachuse€Is Jean Enright<jenright@northandoverma.gov> .ter... RE: 229 Brentwood Circle, NA _ Updated Plan per Conservation Agent Site Walk Jack Sullivan <jacksull530comcast.net> Thu, Mar 31, 2022 at 12:24 PM To: Jean Enright <jenrighl@northan dove rma.gov>, Bonnie Wolstromer<bwolstromer@northandoverma.gov> Cc: Steve Stanish <sstanlsh@horsleywitten.com>, "gena.hatch@com cast.not" <gena.hatch@comcast,net>, Jimmy D'Angelo PE<jdangelo@dangelo-engineering.com>, Janet Bernardo <jernardo@horsleywitten.com> Hi Jean, Bonnie, and Horsley Witten Group members: I am attaching a revised Plan for the above property based on a 3/29/2022 Site walk with Amy Maxner & Taylor Andrews of the Conservation Dept....Amy and Taylor adjusted one of the wetland flags (more upgradient)...as such the following changes were made to the Plan, 1) Wetland line (BVW) revised to reflect new flag location 2) 100 foot BVW buffer and 100 foot Non-disturbance zone revised 3) 325 foot Non_Discharge Zone revised 4) A portion of limit of work line and silt fencing relocated to be outside 100 foot BVW buffer 5) The proposed infiltration field slightly relocated to allow room for transitional grading. That's it...everything else is the same in the materials provided in the 3/25/2022 email. Again...if new paper copies of the Plan are required to be submitted to Town Hall I have copied the owner, Gena Hatch, who can deliver. (Gena...plan size is 18"x24"). Thank you everyone.... Sullivan Engineering Group, LLC Jack Sullivan P,O. Box 2004 Woburn, MA 01888 781-854-8644 On 03/25/2022 11:07 AM Jack Sullivan <jacksull53@comcast,net>wrote: Hi Jean, Bonnie, and Horsley Witten Group members: reviewed the March 8, 2022 memo from the Horsley Witten Group and offer the following changes/additions to address the review comments. 1) The area drain has been eliminated from the project. The owner is able to re-grade the area to eliminate the need for an area drain. Much of the 3-8-2022 review memo involved comments on the area drain. 2) A detail of the 4" NDS pop-up emitter has been added to the plan, 3) Additional erosion control, in the form of a 12" staked mulch soxx has been added around a portion of the soil stockpile area to enhance protection measures. 4) Four (4) trees have been shown and identified for removal on the plan. A 4", 12" and 6" hardwood tree and a 12" pine tree to be removed. 5) A full basement is proposed for the addition (previously a crawlspace) 6) No dewatering anticipated 7) Water and sewer services shown...no gas service to show https:Hma il,google.com/ma it/u/0/?ik=7c2off6265&view=pt&search=al l&permmsg id=msg-f%3A1728833235169418530&simpl=msg-f%3Al 7288332351... 1/3 4/4122,8:41 AM Town of North Andover Mail-RE:229 Brentwood Circle, NA_Updated Plan per Conservation Agent Site Walk 8) Limit of disturbance has been labeled on the Site Plan equal to erosion control barrier limit 9) O&M updated to include inspection of NDS pop-up emitter & inspection log (signed by owner) 10) An erosion and sediment narrative is provided, 11) All erosion barriers are set outside the 100 foot setback to the wetlands (on previous plan I mistakenly had placed erosion barrier about 80 feet from the wetlands). I think this covers everything. I have a site walk on 3129 at 1:00 pm with Taylor Andrews of Conservation to review the wetland line...on this site it is pretty clear being a bottom of slope throughout... If anyone needs paper copies of materials please let me know quantity to provide...the owner is copied and will drop copies, Thank you everybody... Sullivan Engineering Group, LLC Sack Sullivan P.O. Box 2004 Woburn, MA 01888 781-854-8644 On 03/08/2022 9:47 AM Janet Bernardo<jbernardo cr horsieywitten.corn>wrote: Good morning Jean, Please see our review for the residential development at 229 Brentwood Circle. Feel free to contact us with any questions. Thanks, Janet Janet Carter Bernardo, RE, Horsley Witten Group Office: 857-263-8193 From: Jack Sullivan <jacksuI153@conn cast.net> Sent: Tuesday, March 1, 2022 11:51 AM To: Janet Bernardo <jbernardo@horsleywitten.coin> Cc: Jean Enright<jenright@northandoverma.gov> Subject: Re: 229 Brentwood Circle, NA_Watershed Submittal-Arch. Plans Hi Janet, The owner submitted the arch. plans to Jean today as part of the filing...so I wanted to make sure you received them as well. https:/Ima i l.g oogle.Go m/majUu/0/?i k=7c2eff6265&view=pt&search=all&perm msgld=msg-f%3A1728833236169418530&simpl=msg-f%3A1728 8332351... 213 414122,8:41 AM Town of North Andover Mail-RE:229 Brentwood Circle,NA Updated Plan per Conservation Agent Site Welk Thanks again.... Sullivan Engineering Group, LLC Jack Sullivan P.O. Box 2004 Woburn, MA 01888 781-854-8644 On 02/28/2022 2:21 PM Jack Sullivan <iacksu1153@com cast,net>wrote: Hi Janet, Jean Enright asked that I forward to you the full watershed application and Site Plan in electronic format. If you need paper copies just let me know. Thank you! Sullivan Engineering Group, LLC Sack Sullivan P.O. Box 2004 Woburn, MA 01888 781-854-8644 Site Plan_03312022.pdf 709K littps://mail.google.com/mail/u/0/?ik=7c2eff6265&view=pt&search=all&permmsgid=msg-f`/`3A1728833235169418530&simpl=msg-f%3A17288332351... 3/3 Horsley Witten Group Sustainable ;Environmental Solutions 112 Water Street•61,Floor•Boston,MA 02109 857-263•B193•horsleywitten,com March 8, 2022 Ms, Jean Enright, Planning Director Planning Department Town of North Andover 120 Main Street North Andover, Massachusetts 01845 Re: Initial Stormwater Peer Review 229 Brentwood Circle North Andover, Massachusetts Dear Ms. Enright and Board Members: The Horsley Witten Group, Inc. (HW) is pleased to provide the North Andover Planning Board with this letter report summarizing our initial review of the Stormwater Management Report and Site Plan for the proposed improvements to 229 Brentwood Circle in North Andover, MA. The plans were prepared by Sullivan Engineering Group, LLC for Eugenia and Robert Hatch (Applicant). The project proposes the construction of an addition to the current home, and the installation of a subsurface infiltration system at the rear of the existing 1-acre site. The stormwater management for the proposed improvements includes a proposed subsurface infiltration system as well as a proposed area drain behind the existing home and proposed impervious site improvements. A total of 660 square feet (sf) of additional impervious area is proposed on site. The proposed development is located fully within the 325-foot Non-Discharge Buffer Zone from the wetland area located at the adjacent#500 Great Pond Road and requires a Special Watershed Permit. The following documents and plans were received by HW: • Special Permit - Watershed Permit Application, 229 Brentwood Circle, North Andover, Massachusetts, prepared by Sullivan Engineering Group, LLC, dated February 25, 2022 (58 pages); • Hatch Residence Construction Documents, 229 Brentwood Circle, North Andover, Massachusetts, prepared by LYF architects, dated November 22, 2021 (10 pages); and 229 Brentwood Circle Plot Plan of Land, North Andover, Massachusetts, prepared by Sullivan Engineering Group, LLC, dated February 24, 2022 (1 sheet). Stormwater Management Design Peer Review HW offers the following overall comments concerning the stormwater management design as per the Massachusetts Stormwater Handbook (MSH) dated February 2008, the North Andover Stormwater Management and Erosion Control Regulations (Stormwater Regulations) adopted February 15, 2011, and the North Andover Stormwater Management and Erosion Control Bylaw (Bylaw). Hors IeyWitten.com 91 nHorsleyWittenGroup IM Horsley Witten Group, Inc. Town of North Andover March 8, 2022 Page 2 of 4 In accordance with North Andover Code §250-27 Stormwater Management Plan Design and Performance Criteria, this project is required to comply at a minimum with the performance standards of the MSH. Therefore, we have used the MSH as the basis for organizing our comments. However, in instances where the additional criteria established in §250-27 of the North Andover Code requires further recommendations; we have referenced these as well. 1. Standard 1: No new stormwater conveyances (e.g., ouffalls) may discharge untreated stormwater directly to or cause erosion in wetlands or waters of the Commonwealth. a. The Applicant is proposing two stormwater management features to manage runoff generated from the proposed improvements. It appears that no new stormwater conveyances will discharge untreated stormwater directly to wetlands or waters of the Commonwealth. b. The proposed stormwater management consists of an area drain and a subsurface system. These stormwater practices outlet through two 12-inch NDS emitters at the back of the property. HW recommends including a drainage detail for the area drain as well as the proposed outlet emitters. The emitters can become clogged, covered with leaves, grass, or snow and will require regular inspections and maintenance by the homeowner. 2. Standard 2: Stormwater management systems shall be designed so that post-development peak discharge rates do not exceed pre-development peak discharge rates. a. The Applicant has provided the HydroCAD model illustrating the peak flow from the proposed addition and a portion of the existing house discharging into the subsurface infiltration system. The Applicant has not included a separate node showing the area drain at the back of the site and the emitter outlet for the area drain. It appears that the area captured is relatively small and the discharge from the infiltration system is minimal. HW recommends that the Applicant include a table illustrating the anticipated flow out of both emitters during the various storm events. b. Per North Andover Code §250-26.17, a Stormwater Management Plan should include a drainage area map showing pre- and post-construction watersheds, sub-watersheds, and stormwater flow paths, including municipal drainage system flows, The Applicant has included pre-development and post-development watershed maps. HW recommends that the Applicant revise the drainage area maps to illustrate the proposed catchment area flowing to the area drain. 3. Standard 3 requires that the annual recharge from post-development shall approximate annual recharge from pre-development conditions. a. The Applicant has submitted drawdown calculations for the proposed site improvements. It appears that the stormwater management system proposed provides adequate storage and drawdown time for the proposed site improvements. HW has no further comment. The Applicant complies with Standard 3, 4. Standard 4 requires that the stormwater system be designed to remove 80% Total Suspended Solids (TSS) and to treat 1/2-inch of volume from the impervious area for water quality. a. No TSS calculations have been provided for this project. However, the land uses of MProjects12021\21020 Town of North Andover121020F 229 Brentwoodlreport1220308_1st_SW Design Review 229 Brentwood.dom Town of North Andover March 8, 2022 Page 3 of 4 roofs, lawns, and patios do not generate suspended solids that require removal. The Applicant complies with Standard 4. 5. Standard 5 is related to projects with a Land Use of Higher Potential Pollutant Loads (LUHPPL). a. The proposed residential development is not considered a LUHPPL. Therefore, Standard 5 is not applicable to this project. 6. Standard 6 is related to projects with stormwater discharging into a critical area, a Zone ll, or an Interim Wellhead Protection Area of a public water supply. a. The proposed development is not within a critical area, Zone II or an IWPA area. Therefore, Standard 6 is not applicable. 7. Standard 7 is related to projects considered Redevelopment. a. The proposed project involves solely the construction of new impervious area and is not considered redevelopment. Therefore, Standard 7 is not applicable. 8. Standard 8 requires a plan to control construction related impacts Including erosion, sedimentation, or other pollutant sources. a. In accordance with the MSH and North Andover Code §250-29, HW recommends that the Applicant include dewatering facilities (if required based on the soils investigation), a soil stockpile, and temporary and permanent site stabilization practices. The Applicant has included a soil stockpile location but has not included the sediment and erosion controls around the stockpile area. b. HW recommends that the Applicant clearly delineate the project's limits of disturbance. c. HW recommends that the Applicant include an erosion and sediment control narrative in accordance with North Andover Code §250-29(3). d. HW recommends that the Applicant note the number of trees to be removed that are greater than 8" diameter. 9. Standard 9 requires a Long-Term Operation and Maintenance (O & M) Plan to be provided. An O&M Plan has been provided for the proposed project. This O&M Plan submitted is a stand-alone document and has been signed by the property owner(s). HW has the following comments regarding the O&M plan: a. HW recommends adding inspection of the area drain and cleaning four (4) times per year. b. HW recommends inspection and cleaning of the outlet emitters four (4) times per year. c. HW recommends that the Applicant prepare a submittal log and inspection checklist for the items to inspect onsite for the homeowner's use. 10. Standard 10 requires an illicit Discharge Compliance Statement be provided. a. No Illicit Discharge Compliance Statement has been provided. HW recommends that the Planning Board include a condition of approval requiring an Illicit Discharge Compliance Statement signed by the property owner prior to land disturbance. K\Projec02021N21020 Town of North Andover121020F 229 Brentwoodlreportl220308—Ist_Sw Design Review_229 Brentwood.dou Town of North Andover March 8, 2022 Page 4 of 4 11. Additional Comments: a. The proposed site plan includes the existing onsite sanitary sewer connection but appears to be missing other utilities. HW recommends that the Applicant include the approximate locations of all existing infrastructure on the site plan, including the water service, electrical, and gas as applicable. Conclusions HW recommends that the North Andover Planning Board require the Applicant to provide a written response and address the few outstanding comments as part of its review process. We appreciate the opportunity to assist the Town of North Andover on this project review. Please contact Janet Bernardo at 508-833-6600 or at jbernardo@horsleywitten.com if you have any questions regarding these comments. Sincerely, HORSLEY WITTEN GROUP, INC. ISD Janet Carter Bernardo, P.E. Steve Stanish, P.E. Associate Principal Senior Engineer KAProjects\2021121020 Town of North AndoveA21020t=229 Brentwoodlreport1220308-1st, Sw Design Review_229 Brentwood.docx Horsley Witten Group A,0"I': Sustainable Environmental Solutions 112 Water Street-roll floor Boston,MA 02109 867-263-8193-horslaywilten.com , March 31, 2022 Ms. Jean Enright, Planning Director Planning Department Town of North Andover 120 Main Street North Andover, Massachusetts 01845 Re: Second Stormwater Peer Review 229 Brentwood Circle North Andover, Massachusetts Dear Ms. Enright and Board Members: The Horsley Witten Group, Inc. (HW) is pleased to provide the North Andover Planning Board with this letter report summarizing our second review of the Stormwater Management Report and Site Plan for the proposed improvements to 229 Brentwood Circle in North Andover, MA. The plans were prepared by Sullivan Engineering Group, LLC for Eugenia and Robert Hatch (Applicant). The project proposes the construction of an addition to the current home, and the installation of a subsurface infiltration system at the rear of the existing 1-acre site. The Stormwater management for the proposed improvements includes a proposed subsurface infiltration system as well as a proposed area drain behind the existing home and proposed impervious site improvements. A total of 660 square feet (sf) of additional impervious area is proposed an site. The proposed development is located fully within the 325-foot Non-Discharge Buffer Zone from the wetland area located at the adjacent#500 Great Pond Road and requires a Special Watershed Permit. The following documents and plans were received by HW in response to our initial review letter dated March 8, 2022: • Erosion and Sediment Control Narrative for 229 Brentwood Circle, North Andover(1 page); • Long-Term Stormwater Operation & Maintenance Plan, 229 Brentwood Circle, North Andover, signed March 25, 2022 (2 pages); and 229 Brentwood Circle Plot Plan of Land, North Andover, Massachusetts, prepared by Sullivan Engineering Group, LLC, dated February 24, 2022, revised 3/25/22 (1 sheet). Stormwater Management Design Peer Review HW offers the following overall comments concerning the stormwater management design as per the Massachusetts Stormwater Handbook (MSH) dated February 2008, the North Andover Stormwater Management and Erosion Control Regulations (Stormwater Regulations) adopted February 15, 2011, and the North Andover Stormwater Management and Erosion Control Bylaw (Bylaw). HorsleyWitten,com 99 OIorsleyWiftenGroup IM Horsley Witten Group, Inc. Town of North Andover March 31, 2022 Page 2 of 5 In accordance with North Andover Code §250-27 Stormwater Management Plan Design and Performance Criteria, this project is required to comply at a minimum with the performance standards of the MSH. Therefore, we have used the MSH as the basis for organizing our comments. However, in instances where the additional criteria established in §250-27 of the North Andover Code requires further recommendations; we have referenced these as well. The following comments correlate to our initial March 8, 2022 peer review letter. Follow up comments are provided in bold font. 1. Standard f: No new stormwater conveyances (e.g., outfalls) may discharge untreated stormwater directly to or cause erosion in wetlands or waters of the Commonwealth. a. The Applicant is proposing two stormwater management features to manage runoff generated from the proposed improvements. It appears that no new stormwater conveyances will discharge untreated stormwater directly to wetlands or waters of the Commonwealth. March 31, 2022: No further comment needed. b. The proposed stormwater management consists of an area drain and a subsurface system. These stormwater practices outlet through two 12-inch NDS emitters at the back of the property. HW recommends including a drainage detail for the area drain as well as the proposed outlet emitters. The emitters can become clogged, covered with leaves, grass, or snow and will require regular inspections and maintenance by the homeowner. March 31, 2022: The Applicant has eliminated the area drain and has provided a detail for the pop-up emitter. No further comment needed. The Applicant complies with Standard 1. 2. Standard 2: Storm water management systems shall be designed so that post-development peak discharge rates do not exceed pre-development peak discharge rates. a. The Applicant has provided the HydroCAD model illustrating the peak flow from the proposed addition and a portion of the existing house discharging into the subsurface infiltration system. The Applicant has not included a separate node showing the area drain at the back of the site and the emitter outlet for the area drain. It appears that the area captured is relatively small and the discharge from the infiltration system is minimal. HW recommends that the Applicant include a table illustrating the anticipated flow out of both emitters during the various storm events. March 31, 2022: The Applicant has eliminated the area drain therefore this comment is no longer applicable. b. Per North Andover Code §250-26.17, a Stormwater Management Plan should include a drainage area map showing pre- and post-construction watersheds, sub-watersheds, and stormwater flow paths, including municipal drainage system flows. The Applicant has included pre-development and post-development watershed maps. HW recommends that the Applicant revise the drainage area maps to illustrate the proposed catchment area flowing to the area drain. March 31, 2022: The Applicant has eliminated the area drain therefore this comment is no longer applicable. KAProjects12021121020 Town of North Andover\21020F 229 Brentwood\Report1220331_2nd_SW Design Review 229 Brentwood.docx Town of North Andover March 31, 2022 Page 3 of 5 The Applicant complies with Standard 2. 3. Standard 3 requires that the annual recharge from post-development shall approximate annual recharge from pre-development conditions, a. The Applicant has submitted drawdown calculations for the proposed site improvements. It appears that the stormwater management system proposed provides adequate storage and drawdown time for the proposed site improvements. HW has no further comment. March 31, 2022: No further comment needed. The Applicant complies with Standard 3. 4. Standard 4 requires that the stormwater system be designed to remove 80% Total Suspended Solids (TSS) and to treat 112-inch of volume from the impervious area for water quality. a No TSS calculations have been provided for this project. However, the land uses of roofs, lawns, and patios do not generate suspended solids that require removal. March 31, 2022: No further comment needed. The Applicant complies with Standard 4. 5. Standard 5 is related to projects with a Land Use of Nigher Potential Pollutant Loads (LUHPPL). a. The proposed residential development is not considered a LUHPPL. Therefore, Standard 5 is not applicable to this project. March 31, 2022: No further comment needed. 6. Standard 6 is related to projects with stormwater discharging into a critical area, a Zone IJ, or an Interim Wellhead Protection Area of a public water supply. a. The proposed development is not within a critical area, Zone II or an IWPA area, Therefore, Standard 6 is not applicable. March 31, 2022: No further comment needed. 7. Standard 7 is related to projects considered Redevelopment. a. The proposed project involves solely the construction of new impervious area and is not considered redevelopment. Therefore, Standard 7 is not applicable. March 31, 2022: No further comment needed. 8. Standard 8 requires a plan to control construction related impacts including erosion, sedimentation, or other pollutant sources. a. In accordance with the MSH and North Andover Code §250-29, HW recommends that the Applicant include dewatering facilities (if required based on the soils investigation), a soil stockpile, and temporary and permanent site stabilization practices. The Applicant has included a soil stockpile location but has not included the sediment and erosion controls around the stockpile area. March 31, 2022: The Applicant has added erosion controls around the stockpile as KAProjecW2021121020 Town of North Andover121020F 229 Brentwood\Repori1220331 2nd, SW Design Review_229 Brentwood.dou Town of North Andover March 31, 2022 Page 4 of 5 suggested. The Applicant has stated that dewatering is not anticipated. No further comment. b. HW recommends that the Applicant clearly delineate the project's limits of disturbance. March 31, 2022: The Applicant has clarified the limit of work as requested. No further comment. c. HW recommends that the Applicant include an erosion and sediment control narrative in accordance with North Andover Code §250-29(3). March 31, 2022: The Applicant has included a narrative as requested. No further comment. d. HW recommends that the Applicant note the number of trees to be removed that are greater than 8" diameter. March 31, 2022: The Applicant has noted on the plan that four (4) trees will be removed, one 4", one 6" and two 12" trees will be removed on the south side of the addition. The Applicant complies with Standard 8. 9. Standard 9 requires a Long-Term Operation and Maintenance (O &M) Plan to be provided. An O&M Plan has been provided for the proposed project. This O&M Plan submitted is a standalone document and has been signed by the property owner(s). HW has the following comments regarding the O&M plan: a. HW recommends adding inspection of the area drain and cleaning four(4)times per year. March 31, 2022: The Applicant has eliminated the area drain therefore this comment is no longer applicable. b. HW recommends inspection and cleaning of the outlet emitters four (4)times per year. March 31, 2022: The Applicant has noted that the pop-up emitter shall ne inspected four times a year. No further comment. c. HW recommends that the Applicant prepare a submittal log and inspection checklist for the items to inspect onsite for the homeowner's use. March 31, 2022. An Inspection Checklist has been included with the Operation & Maintenance Plan. The Applicant complies with Standard 9. 10. Standard 10 requires an Illicit Discharge Compliance Statement be provided. a. No Illicit Discharge Compliance Statement has been provided. HW recommends that the Planning Board include a condition of approval requiring an Illicit Discharge Compliance Statement signed by the property owner prior to land disturbance. March 31, 2022: HW's previous comment for the Planning Board stands. KAProjects12021\21020 Town of North Andover121020F 229 BrentwoodlReport1220331_2nd_Sw Design Review 229 Brentwood,docx Town of North Andover March 31, 2022 Page 5 of 5 11, Additional Comments: a. The proposed site plan includes the existing onsite sanitary sewer connection but appears to be missing other utilities. HW recommends that the Applicant include the approximate locations of all existing infrastructure on the site plan, including the water service, electrical, and gas as applicable. March 31, 2022: The Applicant has shown the water and sewer services lines on the plan set. Conclusions HW is satisfied that the Applicant has adequately addressed our comments. We appreciate the opportunity to assist the Town of North Andover on this project review. Please contact Janet Bernardo at 857-263-8193 or at ibernardo(@,horslevwitten.com if you have any questions regarding these comments. Sincerely, HORSLEY WITTEN GROUP, INC. V Janet Carter Bernardo, P.E. Associate Principal KAProjects12021121020 Town of North Andover121020F 229 BrentwoodlRepoi11220331_2nd_SW Design Review 229 Brentwood.docx Sullivan Dighwerhig Group, LLC Civil Engineers&Land Development Consultants 229 Brentwood Circle, North Andover Erosion and Sediment control narrative: The owner has shown erosion control to be established in the work area and construction access points. A construction detail is shown on the plan to provide the contractor guidance for installation. A proposed soil stockpile area is shown, but most likely will not be needed since excavated soil for the addition will be Mucked directly from the site. All disturbed areas shall be stabilized as quickly as possible with grass seed. In the event that the site is disturbed over winter months there straw mulch shall be spread over the disturbed areas until the growing season returns. Erosion control shall be inspected weekly by the contractor and homeowner to make sure it is functioning properly. In the event silt buildup is high on the barrier it shall be removed. Erosion control shall be replaced if any signs of failure are noted. P.O. Box 2004 Woburn, MA 01888 (781) 854-8b44 e-rail:jacksu1153@coliicast.net comcast.net Sullivan Engineering Group, LLC C:'ii-fl L'ngi vu,s S, Lewd De elopment 0m!iultaiM5, Long;-Term Storlmwater Operation & Maintenance Plan 229 Bi-entwood Circle, North Andover Beginning with the construction of the drainage system, and continuing in perpetuity thereafter, the owner(s) of the site Shall maintain ill accordance with (lie following schedule. a. Pavement and walkways shall be swept in the early spring immediately after snow melt b. Roof chain inlets, downspouts, and roof drain pipes - All components of the roof drain collection system shall be inspected at least 2 times per year. Sediments and debris shall be removed and disposed of in accordance with all applicable Federal, state, and local laws. Any components that become damaged shall be repaired or replaced immediately upon discovery to assure proper conveyance of stornmater runoff into the drywell systems. c. Infiltration Chambers—The level of water in the infiltration chambers shall be monitored during and after heavy rain storms at Icast 2 times per year during tllc first year of operation and at least twice annually thereafter for evidence of clogging or other problems. If water does not leave the chainbei:s within 72 hours after the storm, or if water breaks out oil the surface above the system, or if the roof' collection system begins to overflow frequently (for the 10 year storm intensity oi. less intense storms), the infiltration bed is likely clogged. Tile infiltration bed shall be cleaned and repaired or replaced as needed to maintain proper functioning. d. Vegetation shall be maintained in healthy condition to prevent erosion and sedimentation in the drainage system and wetland resource areas. e. The NDS 4" pop-up emitter shall be inspected four(4) times per year to insure no clogging and to remove any accumulated leaves, grass, or snow, Emitter shall be Checked to determine if functioning properly. E March 25, 2022 owner: Date 4 *Gjlul Hatch See next page For Inspection Log P.O. Box 2004 Woburn, MA 01888 (781) 854-8644 c-mail: jacl<snI153�r�Gotilcast.nct 229 Brentwood Circle—Inspection Log Inspection and Maintenance Report Form To be completed per the Operation and Maintenance schedule Inspector: Date: Inspection Checklist Item: Pavement and Walkways Accumulated sand, sediment, leaves Yes or No (circle one) Sweeping took place Yes or No (circle one) Roof drains inlets and downspouts Any signs of sediment or debris at outlets Yes or No (circle one) Condition of drain inlets/downspouts Good or Poor (circle one) Any piping need replacement Yes or No (circle one) Infiltration Chambers Any signs of water breakout Yes or No (circle one) Any water in chambers Yes or No (circle one) If water in chamber, is it empy after 72 hrs Yes or No (circle one) Vegetation Does site vegetation, including grass look health Yes or No (circle one) NDS pop-up emitter Are they accumulated leaves, grass or snow Yes or No (circle one) Does emitter appear to be in good condition Yes or No (circle one) Additional Notes or Corrective measures taken: P.O. Box 2004 Woburn, MA 01898 (781) 854-8644 e-mail:jacksu1153@comcast.net