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Home My WebLink About2019-09-03 Stormwater Review SPR III ILLICIT DISCHARGE STATEMENT FOR MINED USE DEVELOPMENT 695 & 701 SALEM STREET NORTH ANDOVER,MASSACHUSETTS DATE: JUNE 13, 2019 Illicit discharges to the storn'iwater management system are discharges not entirely comprised of stormwater. There are no known illicit discharges currently at the site nor are any illicit discharges proposed as part of the project. The stormwater management system is not intended to convey any illicit discharges and or pollutants. Any unknown existing illicit discharges that are discovered as part of the development of the subject site shall be eliminated in accordance with local, state and federal regulations. Sigma . sAle ►s a4m,(1 1�?�e PV7 S-/,- Z'z Name/Title Date CIVIL DESIGN GROUP, LLC zth An over,Street,Suite 0845 1\art7��lexiorcr,\4A 01845 Tel 978,794.5400 ENGINEERING, LAND USE. PLANNING. PERMITTING. %V%N-W.cdgengineeruig.com July 17, 2019 Wa email Ms. Monica Gregoire Staff Planner Town of North Andover 120 Main Street North Andover, MA 01845 Re: Second Stormwater Peer Review Proposed Mixed Use Expansion 695 & 701 Salem Street North Andover,MA 01845 Horsley Witten Group Second Response to Comments Dear Ms. Gregoire: On behalf of the applicant, Virginia, Inc., Civil Design Group, LLC (CDG) is in receipt of the peer review letter issued by Horsley Witten Group dated 7/10/19. In coordination with the development team, CDG's secondary responses are provided in bold below the secondary comments and supporting plans and documentation are enclosed herein: 2. Standard 2 states that storm water management systems shall be designed so that post-development peak discharge rates do not exceed pre-development discharge rates. d. The Applicant has provided data and locations of five test pits. However, MSH Vol. 2, Ch. 2,p. 104 requires that the Applicant provide at least two test pits at the location of the infiltration practices. To verify the estimated seasonal high ground water elevation is accurate, HW recommends that the Applicant provide two more test pits in the location of the subsurface infiltration systems. HW: The Applicant has requested that additional test pits be conducted at the time of construction as to limit any disturbance to the current store operations. The Applicant also states that at that time if seasonal high groundwater is identified at a higher elevation than assumed, the infiltration system design will be modified accordingly and submitted to the Town for review and approval. Based on review of the existing conditions plan and the proposed locations of the subsurface infiltration systems,both systems are located in areas of existing lawn or vegetation that are not currently utilized for the operation of the existing building use. Therefore, HW believes that conducting the test pits prior to construction is feasible and recommended. commercial retail residential mixed use subdivisions industrial municipal CIVIL DESIGN GROUP, LLC 21i.An Street,Suite 207 845 No�ih Andover,i14r101845 Tel 978,794.5400 ENGINEERING. LAND USE. PLANNING. PERMITTING. imAv,edgengrineering.coln However, if the Board wishes to grant the Applicant's request, HW recommends that the Board condition the permit such that construction of the infiltration practices cannot be initiated until the test pit results have been reviewed and approved by the Board. CDG: No response required. i 1. Staiidard 8 i•egtiires a plan to coiiti-ol coristriictioii related impacts iiicludiiig erosion, sedimentation, or other polhitant sources. b. HW recommends that the following items be added to the Erosion Control Plan: • Clarify whether the existing storniwater basin is intended to receive runoff from dewatering operations HW: The Applicant states that the General Contractor, when selected,will be responsible for determining dewatering operations. HW recommends that the Board include a condition that,water from dewatering operations cannot be discharged to the existing stormwater basin without adequate treatment. CDG: No response required. c. The North Andover Stormwater Management and Erosion Control Bylaw requires that the following items be added to the Erosion Control Plan: • Locations for storage of materials, waste, vehicles, equipment, soil, snow and other potential pollutants; and HW: The Applicant has added a note to the drawings asking the owner to depict the anticipated locations of these materials. HW recommends that the Applicant include the anticipated locations on the construction related items on the plan with an understanding that the plan can be updated during construction to depict the actual location of these materials. CDG: The revised plan set depicts areas designated for the storage of materials, waste, vehicles, equipment, soil, snow, and other potential pollutants during the demolition and construction pleases. • Locations of any proposed dewatering facilities. HW: The Applicant added a note indicating that the locations of dewatering facilities would be provided by the Contractor and water commercial retail residential mixed use subdivisions industrial municipal h Stfait,Suite 207 CIVIL DESIGN GROUP, LLC 21 Hjidove,AIA01845 now,�,dover,ns�olsas ENGINEERING. LAND USE. PLANNING. PERMITTING. Tel ��s.ng.co�va�v. m 794,5400 cdgengir�ecrug.c �n would be discharged to a sediment basin. HW recommends that the Applicant provide a standard detail for a sediment basin on the plans. CDG: The revised plan set includes a standard sediment basin detail, 10. . Standard 10 requires an Illicit Discharge conipl lance Statement to be provided. a. The Applicant has provided an Illicit Discharge Compliance Statement. HW recommends that the Illicit Discharge Compliance Statement be signed by the property owner prior to land disturbance. HW: The Applicant states that a signed Illicit Discharge Compliance Statement has been included for the Town's records. A copy of this signed letter was not included in the materials provided. HW recommends that the Board confirm that this statement has been provided to the Town. CDG: A signed illicit discharge statement is included for the Town's records. We trust the responses provided above and the enclosed plans sufficiently address the secondary comments issued by the peer reviewer. Please feel fi'ee to contact our office if you have any questions or require further clarification. Sincerely, CIVIL DESIGN GROUP, LLC Philip R. Henry, P.E. Principal CC. Mr,James Xenakis,Owner Mr.Brian Vaughan,Esq. Mr.11tomas Galvin,Architect Enclosures commercial retail residential mixed use subdivisions industrial municipal ILLICIT DISCHARGE STATEMENT I FOR MIXED USE DEVELOPMENT 695 & 701 SALEM STREET NORTH ANDOVER, MASSACHUSETTS DATE: JUNE 13, 2019 a Illicit discharges to.the stormwater management system are discharges not entirely comprised of stormwater. There are no known illicit discharges currently at the site nor are any illicit discharges proposed as part of the project. The stormwater management system is not intended to convey any illicit discharges and or pollutants. Any unknown existing illicit discharges that are discovered as part of the development of the subject site shall be eliminated in accordance with local, state and federal regulations. igIla A/ Name/Title q Date k i I CIVIL DESIGN GROUP, LLC 21 FAn over, IA01845 i North Andover,rtrn 01845 Tel 978.794.5400 ENGINEERING. LAND USE. PLANNING. PERMITTING, wim.edgengineedng.com June 25, 2019 vier email Ms. Monica Gregoire Staff Planner• Town of North Andover 120 Main Street E North Andover, MA 01845 E Re: Stormwater Peer Review Proposed Mixed Use Expansion 695 & 701 Salem Street North Andover,MA 01845 Horsley Witten Group Response to Comments Dear Ms. Gregoire: On behalf of the applicant,Virginia,Inc., Civil Design Group, LLC (CDG) is in receipt of the peer review letter issued by Horsley Witten Group dated 5/21/19. In coordination with the development team, CDG's responses are provided in bold below the original continents and supporting plans and documentation are enclosed herein: 1. Standard I states that no new storrnwater conveyances (e.g. outfalls) nray discharge untreated storniwater directly to or cause erosion in wetlands or•waters of the Connnonwealth. a. The Applicant has proposed two subsurface infiltration systems to manage the proposed storinwater runoff from the building expansion and the additional parking area. The eastern half of the pavement area will continue to discharge to the closed drainage system within the parking lot that discharges to an existing detention basin located at the corner of Abbot Street and Salem Street. The Applicant has reduced the runoff to the municipal system and complies with Standard 1. HW recommends that for documentation purposes the Applicant clarify where the existing municipal system eventually discharges. It appears that the stormwater runoff collected by the municipal system continues to travel in a southerly direction off-site and eventually discharges into Mosquito Brook. 2. Standard 2 states that stornrwater nranagernent systems shall be designed so that past-development peak discharge rates do not exceed pre-development peak discharge rates. a. The Applicant has provided the HydroCAD modeling calculations for the 2- yr, 10-yr, 25-yf and I00-yr storm events. The North Andover Storniwater commercial retail residential mixed use subdivisions industrial municipal uite 207 CIVIL DESIGN GROUP, LLC 21H�ghover,, A01845 North Andq��er,A{A 0]845 TO 978.794.5400 ENGINEERING. LAND USE, PLANNING. PERMITTING, wvnv.cdgengincering.com Management Regulation Section 7.2.B.b also requires an analysis of a 0.5- inch storm, HW recommends that the Applicant provide the missing analysis. The revised HydroCAD modeling calculations include the 0.5" storm event. b. The Applicant has indicated that the stotmwater runoff from the proposed building roof will be collected via a pipe and directed to the subsurface infiltration system. HW recommends that the Applicant include a detail of the roof leaders and means to overflow if the subsurface system backs up. The rainwater collection from the building roof is a gutter system with rain leaders. The rain leaders connect to the subsurface infiltration system 2 via a downspout boot. This is a soft connection which will allow overflow if the system is over charged. c. The Applicant has not provided the details or labeled the locations of the clean out ports for the subsurface structures. According to the North Andover Storinwater Management and Erosion.Control Bylaw, Section 7.2.D.£ adequate access must be provided to all water quality BMP's for inspection and maintenance. HW recommends adding the clean out port details and labels to the site plans, The revised plan set includes labels for access and maintenance to the subsurface infiltration systems. d. The Applicant has provided data and locations of five test pits, However, MSH Vol. 2, Ch. 2, p. 104 requires that the Applicant provide at least two test pits at the location of the infiltration practices. To verify the estimated seasonal high ground water elevation is accurate, HW recommends that the Applicant provide two more test pits in the location of the subsurface infiltration systems. The applicant respectfully requests that additional test pits be conducted at time of construction so as to limit any disturbance to the current store operations. If seasonal high groundwater is observed at a higher elevation, the infiltration systems will be modified accordingly and submitted to the town for review and approval. e. HW recommends that the Applicant verify that stormwater runoff from the proposed development does not flow west of the limit of work. The topography is limited in this area and HW is not able to confirm that the western property boundary will not be impacted by the development. The survey information is limited in that area due to obscurities by overgrown vegetation. The proposed runoff areas contributing to that commercial retail residential mixed use subdivisions industrial municipal CIVIL DESIGN GROUP LLC 21 High Street,Suite 9207 45 North Andover,MA Q1845 i ENGINEERING. LAND USE. PLANNING. PERMITTING. Tel 978. www.edgengineering..co#nom portion of the site will be less than the existing condition and will have no contributing runoff from impervious surfaces, Therefore, (lie westerly property boundary will not be adversely impacted by the development. £ The Applicant has included a storm sewer inventory report detailing a slope of less than 0.5%for the pipe between CB 1 and DMH 1. HW recommends that the Applicant confirm that this pipe will have adequate cleansing velocity, 1, The revised plan set shows ail S" HDPE pipe from CB-1 to DMH-1, effectively raising the upstream invert, and increasing the slope of this pipe section to 0.9%, thereby providing adequate cleansing velocity. g. The Applicant has labeled EXCBI with two separate leaders with different rims and inverts. HW recommends that the Applicant revisit this structure and correct the discrepancy. The duplicate leaders have been removed from all existing catch basins to eliminate any confusion. 3. Standard 3 states that the annual recharge fi�oln post-developnaerrt shall approximate the annual recharge f•orn pre-development conditions based on soil o pe. a. The Applicant has provided adequate recharge for the additional impervious area. The existing stormwater basin includes an outlet at the bottom of the basin. HW recommends that the Applicant explore the possibility of retrofitting this basin to allow for additional recharge from the existing impervious area The applicant does not wish to modify the existing basin as it appears to be functioning properly as is. 4. Standard 4 states that the storrnwater m ail a ernent s stem shall be designed to remove g Y g 80%of the average annual postconstruction load of Total Suspended Solids (TSS) and is sized to treat 1.0-inches of volume from the impervious area far water quality. a. The Applicant has provided water quality calculations for 0.5 inches of runoff. However, as the Applicant is using an infiltration rate of 8.27 in/hr for sand, it is required to treat 1-inch of volume over the impervious area for water quality. HW reconunends adjusting the calculations accordingly. The TSS Removal Calculation Worksheet(Table 3 in the Stormwater Narrative) has been updated to account for 1.0 inch of volume over the impervious area. S. Standard S is related to projects with a Land Use of Higher Potential Pollutant Loads (LUHPPL), commercial retail residential mixed use subdivisions industrial municipal treet, 207 CIVIL DESIGN GROUP) LLC 21 High over,_ A01845 North rindovcr,1it101845 Tel 978.794.5400 ENGINEERING. LAND USE. PLANNING.PERMITTING. www,edgengincering.coin a, The proposed project is not considered a LUHPPL therefore Standard S is not applicable. No response required. 6. Standard 6 is related to projects with stormwater discharging into a critical area, a Zone 11 or an lnterirrt Wellhead Protection Area of a public water supply. a. The proposed project is not located within a critical area therefore Standard 6 is not applicable. No response required. 7. Standard 7 states that a redevelopment project is required to meet the following Storinivater Management Standards only to the niaxinuun extent practicable: Standard 2, Standard 3, and the pretreatment and structural best inanagennernt practice requirenents of Standards 4, S, and 6. Existing stornnvater discharges shall comply with Standard I only to the maxinunn extent practicable. A redevelopment project shall also comply with all other requirements of the Storinwater Management Standards and intprove existing conditions. a. The proposed project is not considered a redevelopment therefore Standard 7 is not applicable. No response required. 8. Standard 8 requires a plait to control construction related impacts including erosion, sedimentation or other pollutant sources. a. HW recornmends that a schedule for sequencing construction and stormwater management activities be added to the Erosion Control Plan. A construction schedule has been added to the "Demolition & Erosion Control Plan". b. HW recommends that the following items be added to the Erosion Control Plan. i. Add silt sacks to the three on-site catch basins that are to remain; A call-out has been added to the"Demolition &Erosion Control Plan" specifying that silt sacks be placed in the three on-site catch basins to remain. ii. Clarify whether the existing stormwater basin is intended to receive runoff frorn dewatering operations; and commercial retail rosiitential mixed use subdivisions industrial municipal pf i CIVIL DESIGN GROUP, LLC 21liin Street,Suite8207 45 Nord Andover,\Lr1©1845 ENGINEERING. LAND USE. PLANNING. PERMITTING. ret 978. �v�v�v.cdgenginccring.cowm.»g Dewatering operations have not been finalized to date. Once a General Contractor has been awarded the project, dewatering operations will be reviewed and finalized with the Town. All dewatering operations will need to be adhered to by the General Contractor as referenced on the"Demolition & Erosion Control Plan", including but not limited to, adequate settling time prior to final discharge. iii. Add protection for the remaining trees in the south-west border of the property, Clarify which trees need to be pruned to facilitate construction. The revised plaits include a 4' high orange construction fence surrounding trees to remain along the southwest border of the property. The fence detail has been added to Sheet 8 and the call-out on the "Demolition &Erosion Control Plan" has been modified to specify that contractor shall coordinate with the owner and engineer prior to pruning. c. The North Andover Stornnwater Management and Erosion Control Bylaw requires that the following items be added to the Erosion Control Plan; i. Path and mechanism to divert uncontaminated water around disturbed areas, to the maximum extent practicable; The revised plans include a diversion berm along the northwest border of the site, ten feet froin the property line, to divert uncontaminated water from flowing onto the site. The applicable detail has been added to Sheet 8. ii, Locations for storage of materials, waste, vehicles, equipment, soil, snow and other potential pollutants; and The revised plaits include note#45 on the"Demolition & Erosion Control Plan" to provide direction for storage locations. iii. Locations of any proposed dewatering facilities. The revised plans include added language to note #27 on the "Demolition &Erosion Control Plan" to provide direction for dewatering facility locations. d. The Town of North Andover in the Storinwater Management and Erosion Control Regulations requires that the following additional conditions be added to the Sediment and Erosion Control Plan; commercial retail residential mixed use subdivisions industfial municipal CIVIL DESIGN GROUP, LLC 21 High Street,Suite 207 945 Naxth Andover,MA D1845 Tel 978.794.5440 ENGINEERING. LAND USE. PLANNING. PERMITTING. www.edgengineering,com i. Measures used to maintain the infiltration capacity of existing soils where any kind of infiltration is proposed; The revised plans include added language to note#16 of the"Grading &Drainage Plan" to provide further direction for preparation of SIS construction. ii. Sediment from sediment traps or sedimentation ponds to be removed when it reaches a depth of six inches; The revised plans include this language as note#46 on the "Demolition &Erosion Control Plan". iii. Topsoil shall be stripped from disturbed areas, stockpiled in approved areas and stabilized with temporary vegetative cover if it is to be left for more than 30 calendar days; and The revised plans include this language as note#47 on the "Demolition &Erosion Control Plan". iv. Soil stockpiles must be stabilized or covered at the end of each workday. Stockpile side slopes shall not be greater than 2:1. The revised plans include this language as note#48 on the "Demolition &Erosion Control Plan". v. Temporary seeding,mulching or other suitable stabilization methods shall be used to protect exposed soil areas during construction; as feasible, natural vegetation shall be retained and protected; during the months of October through March, when seeding may be impractical, an anchored mulch or sod shall be applied as approved by the Planning Board or by its designee; diversions and/or prepared outlets may be required in critical areas during construction. The revised plans include this language as note#49 on the "Demolition &Erosion Control Plan". vi. Permanent seeding shall be undertaken in the spring from.March through May, and in late summer and early fall from August to October 15. During the peak summer months and in the fall after October 15,when seeding is found to be impractical, appropriate temporary mulch shall be applied. Permanent seeding may be undertaken during the summer if plans provide for adequate mulching and watering. The revised plans include this language as note#50 on the "Demolition &Erosion Control Plan". commercial retail residential mixed use subdivisions industrial municipal A 207 CIVIL DESIGN GROUP, LLC 2llAn over, IA01845 North Andover,Mn ata�ss ENGINEERING, LAND USE. PLANNING. PERMITTING. Tel 978.ng..co �vww. o m cdgengineeri �n 1 9. Standard 9 states that a long-term operation and maintenance (O&M)plait shall be developed and implemented to ensure that storinwater management systems firtrction as designed. a. The Applicant has provided an Operation &Maintenance Plan, dated March 27, 2019. The Applicant complies with Standard 9. No response required. 10. Standard 10 regidres an.Illicit Discharge Compliance Statement to be provided, a. The Applicant has provided an Illicit Discharge Compliance Statement. HW recommends that the Illicit Discharge Compliance Statement be signed by the property owner prior to land disturbance. A signed illicit disebarge statement is included for the Town's records. We trust the responses provided above and the enclosed plans sufficiently address the comments issued by the peer reviewer. Please feel free to contact our office if you have any questions or require further clarification. Sincerely, CIVIL DESIGN GROUP, LLC Philip R. Henry,P.E. Principal CC. Mr.James Xenakis,Owner Mr.Brian Vaughan,Esq, Mr.Thomas Galvin,Architect Enclosures I commercial retail residential mixed use subdivisions industrial municipal i i i SITE PLAN SET FOR PROPOSED MIXED USE EXPANSION LOCUS PLAN 695 & 701 SALEM STREET $�ALE1• NORTH ANDOVER, MA 01845 DATE DATE SHEET SHEET r --' :� REVISED NUTSMER DESCRTPTTON / �,-_ PREPARED BY: 0410a?019 06^sI2019 I COVER SElEE'(' `� / ;F' � TM 0123>~OI9 06/19=19 ^- epUNpwRr.7bPpORAPHlC d•4'!1Llrvsuaver d'M1� �7 �!OuDmO19 0612s-'019 3 pEMOLI'nDN ANp lRpS7D1 WNTROLPLANrCIVILDESIGNf 0.,w°019 06PSf1A19 4 $1'IE PLAN 04,U/?019 M6sC019 5 GRADING&DRAINAGE PLAN r1'=;!`'�'`:" �f GROUP,, LLC Dar04/-'019 ON252019 6 UTILTTY PLAN '/�1 ` "+Y. .,•rd1r -:ram.! j�„4 r W109r-019 - 7 LANDSCAPEMAN / r � ro®,.�m,m, f 21 HIGH SST SL11T1;207 041,44 19 06rsr,019 8 CommUCTrom OrTARS + 9N� �? NORTH ANDOVER,MA 01945 1'�f www.cdgengineeriug,.com 04,W-019 0615=9 9 CONSmUCI3oN DETAILS r"li;;y 6! ��..... = �` l l � p:978-794-5400 04I04r019 062sr019 10 CONSTRL1Cr1oN7)ErA:LS / E - -- - - T ' - 1 ! f:978-965-3971 o-uonrol9 oe ssrm9 11 CONsmucnoN nErqu s CONTACT:PHILIP HENRY.P.E. "04R019 O6rF5n019 12 CONsmuc 1oN DEMIS 0312-irn19 061242°19 A100 FLOOR AND ROOFPLAN PREPARED FOR: W-pz019 0624POi9 A101 EUIL➢ING ELEVATIONS 6YDAn019 06r'.A✓z019 E-I.0 511TiPHOTOMETRIC$ vRGi'1\i I"`,�'C Nt.'PF(1RCan,�L'rnoh i—f—__ — ----- fy —_ 701 SALEI�4ST12EHT -m v"nwxnuoaun' auaer_o19 o6rar_°E9 E-2° LUMEN REnmExnac NORTH ANDOVE lVA 01845 mg OVERALL LAYOUT PLAN SCALE: g�a PROPERTY: MiINICIPALCrY CONTACTS: 695 S.70I SALEM STREET e133II73PR HE171v,P.E NORTH ANDOVER,MA 01645 - riFbnRiuGwT conraCr P110 NE NUMBER gooriE"sS SHmI: - GUR1C WOR1l5 JIM STANFDRO 976-g8y-.0950 M-0 Siw].Y,NOrsm Nuoovw,un OWNER OF RECORD: CONSULTANTS: assvmk U4N0 M.Era ale-eea-ssee ar,Noma 9.rN,v. 701 SALEM STREET REALTY TRT29T �!CT1(+Y�Yt7Y+ry� FIR_ WLD MCCARTW 976-6a8-9590 55�NOb.Noa[N w90+6i.W 701 SALEM STR= CO Y L'R a�i+i•E SDRV$Y: ARCI{1TEC"f: "EAL 9RIAN L4CRASSE 97e-9H69 ]+�A+MYi ErR[Cf.N9AiN IN96VIIL MN NORTH ANDOVER,MA 01845 { LEVESQUE CEOMATiCS iNC 1D LAGRAS$E AND ASSOCIATES auNNIMc jr,ERRICVFr 3 O7&-6B&-9535 120 w�N sm¢r.N—k amovca,Ica 43 GLZNDALE ROAD ONE E.LM SQUARE GCUCE CWWLES CR4Y 978-6a�716e —cCCODO--,—uuowcx,w 4 S7URS DGEMAO151$ ANDOVERMADISIO TOW CLERK JOYCE a>:mernw e7s-sea-95oa +�MAN smra.N—�vmwfx.w MICHAEL XENACCIS 1E SO&8Wwl 97&410-1675 Ware a scuts Wccr� J 978-685-0950 695 SALEM STREET eNew�wlNe oaPaRrrr�rlr �oNH a-+rscca 97a-6ea-0ssp ae+o:c9oa sm¢r.aroma.woovw.w, ANDOVER,MA 01845 :,; CONTACf:JOE LEVESQUE.KS COMACT:TFOMhS GAi,VCd.A1A.7ti'CARB -_-.....-.... 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REFERENCE s�' orw A�fi("o6"6d'�R�xm"ounmsiro aww wCBrcawx Mm -F F �.-3iN wx rtacn hrdA nano Wx I_ x/A NIA R1-S � fC• +s,>w�wc s i F ^ 7 ' sofa " urt ff san uN I F"von w6 amarn aM11 o ¢ 6mc SITE LAYOLT NOTES LAND COVERAGE CALCULATIONS � �� R7-B c aa€ � am � �;�~�"�,�'^ -�`�_y `�'l-• �d r .a E z A r�mns or rntl,orr;tuu ec curmm,uxlt�cnalxwlsE cullpxc o]� ,z o A: N � y, w - �_ i rr, �, , x c q�pa on a Irt s uoxamocx oP ox7r xc xu osar x T umL sm au c•`/ 0�'1^ aa; I ]s 1unF65 ri 1[ ra�K ,w w lou ,wr•c ,oar R7-8¢ �/ C 641 BS BB 67 BB sg ��ti_` ��=` 4�v;�K r. ]•I ,. xm+-Iaxsaac aa+no+naylw c svwc oxw+aols xs � .-� � 1 I�rruc s �I �fz3P(i"m7d94}°'AA"com ax xS �' y° r 1 a NORTH ANDOVER FIRE TRUCK s wL PAwXENr]wnaxcs svu.o<>c�w>rslm wa1P"r "" (AASHTO EQUIVALENT DESIGN p°r ,xao1i of ll0 ? 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JO �` l.-U 1 6 I.; Rill, ...... ...... ,4, 1— 1�21-1*0, 701 Salem StAddMon SEte Photometrj'cs E-1.0 s m f ©��i��E�� ■emu--, m� mC®� 'vdWN' Horsley Witten Group , r Sustainable Environmental Solutions 204 Washinglon Street•Suite 801•Boston,MA 02108 r 857.263.8193 horsleym ilten,00m May 21, 2019 Ms, Monica Gregoire, Staff Planner Planning Department Town of North Andover 120 Main Street North Andover, Massachusetts 01845 Ref: Stormwater Peer Review Proposed Mixed Use Expansion 695 & 701 Salem Street, North Andover, MA 01845 Dear Ms. Gregoire 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 Report and permitting plans for the proposed construction of a new 8,700 square foot(sf) building expansion with 70 parking spaces, landscaping and stormwater improvements at 695 & 701 Salem Street in North Andover, MA. The stormwater design was prepared by Civil Design Group, LLC for Virginia, Inc. (Applicant). HW understands that the Applicant is proposing to raze one existing building and part of a second existing building and construct a building expansion, with associated parking area and stormwater management on a 1.41 acre site, No part of the project is within a wetland resource area or associated buffers, The following documents and plans were received by HW: Stormwater Management Report for Proposed Mixed Use Expansion, 695 & 701 Salem Street, North Andover, MA 01845, prepared for: Virginia, Inc,, prepared by Civil Design Group, LLC, dated April 4, 2019; and • Site Plan Set for Proposed Mixed Use Expansion, 695 & 701 Salem Street, North Andover, MA, 01845, prepared by Civil Design Group, LLC, which include: o Cover Sheet 1 (04/04/2019) o Boundary, Topographic& Utility Survey 2 (02/12/2019) o Demolition and Erosion Control Plan 3 (04/04/2019) o Site Plan 4 (04/0412019) o Grading & Drainage Plan 5 (04/0412019) o Utility Plan 6 (04/04/2019) o Landscape Plan 7 (04/04/2019) o Construction Details 8 (04/04/2019) o Construction Details 9 (04/04/2019) o Construction Details 10 (04/04/2019) Hors ley%tten.cor t 91(p)HorsleyWiffenGrou Horsley When Group, Inc. Town of North Andover May 21, 2019 Page 2 of 5 o Construction Details 11 (04/0412019) o Construction ❑etails 12 (04/04/2019) o Proposed Addition 13 (03/2512019) o Site Photometrics E-1.0 (04/0812019) Stormwater Management Design Peer Review HW offers the following overall comments concerning the stormwater management design as per the Zoning Bylaw for the Town of North Andover, last amended May 16, 2017 and the Massachusetts Stormwater Handbook (MSH) dated February 2008 as well as standard engineering practice. The North Andover Stormwater Management and Erosion Control Regulations adopted February 5, 2011 and the North Andover Stormwater Management and Erosion Control Bylaw are applicable as the land disturbance is more than 43,560 sf. In accordance with Article 8.3, section 5.e) viii) of the Zoning Bylaw, all applications for Site Plan Review shall demonstrate full compliance with the Massachusetts Stormwater Standards, therefore the comments below correlate with the MSH standards. In accordance with Massachusetts Department of Environmental Protection (MassDEP) the project is not considered a redevelopment which means all standards must be met. 1. Standard 1 states that 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 has proposed two subsurface infiltration systems to manage the proposed stormwater runoff from the building expansion and the additional parking area. The eastern half of the pavement area will continue to discharge to the closed drainage system within the parking lot that discharges to an existing detention basin located at the corner of Abbot Street and Salem Street. The Applicant has reduced the runoff to the municipal system and complies with Standard 1. HW recommends that for documentation purposes the Applicant clarify where the existing municipal system eventually discharges. 2. Standard 2 states that 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 modeling calculations for the 2-yr, 10-yr, 25- yr and 100-yr storm events. The North Andover Stormwater Management Regulation Section 7.2.B.b also requires an analysis of a 0.5-inch storm. HW recommends that the Applicant provide the missing analysis. b. The Applicant has indicated that the stormwater runoff from the proposed building roof will be collected via a pipe and directed to the subsurface infiltration system. HW recommends that the Applicant include a detail of the roof leaders and means to overflow if the subsurface system backs up. c. The Applicant has not provided the details or labeled the locations of the clean out ports for the subsurface structures. According to the North Andover Stormwater Management and Erosion Control Bylaw, Section 7.2.D.f. adequate access must be provided to all 1-I:\Projec1,W018\18t3'S5 N Andover On-Cal1\18065F Salern Sheet\RelxwIS\100521_ISt Peer Review salr.rn street.docx 1 Town of North Andover May 21, 2019 Page 3 of 5 water quality BMP's for inspection and maintenance. HW recommends adding the clean out port details and labels to the site plans. d. The Applicant has provided data and locations of five test pits. However, MSH Vol. 2, Ch. 2, p. 104 requires that the Applicant provide at least two test pits at the location of the infiltration practices. To verify the estimated seasonal high ground water elevation is j accurate, HW recommends that the Applicant provide two more test pits in the location of the subsurface infiltration systems. e. HW recommends that the Applicant verify that stormwater runoff from the proposed development does not flow west of the limit of work. The topography is limited in this area and HW is not able to confirm that the western property boundary will not be impacted by the development. f. The Applicant has included a storm sewer inventory report detailing a slope of less than 0.5%for the pipe between CB1 and DMH1. HW recommends that the Applicant confirm that this pipe will have adequate cleansing velocity. g. The Applicant has labeled EXCB1 with two separate leaders with different rims and inverts. HW recommends that the Applicant revisit this structure and correct the discrepancy. 3. Standard 3 states that the annual recharge from post-development shall approximate the annual recharge from pre-development conditions based on soil type. a. The Applicant has provided adequate recharge for the additional impervious area. The existing stormwater basin includes an outlet at the bottom of the basin. HW recommends that the Applicant explore the possibility of retrofitting this basin to allow for additional recharge from the existing impervious area. 4. Standard 4 states that the stormwater management system shall be designed to remove 80% of the average annual postconstruction load of Total Suspended Solids (TSS) and is sized to treat 1.0-inches of volume from the impervious area for water quality. a. The Applicant has provided water quality calculations for 0.5 inches of runoff. However, as the Applicant is using an infiltration rate of 8.27 inlhr for sand, it is required to treat 1- inch of volume over the impervious area for water quality. HW recommends adjusting the calculations accordingly. 5. Standard 5 is related to projects with a Land Use of Higher Potential Pollutant Loads (LUHPPL). a. The proposed project is not considered a LUHPPL therefore Standard 5 is not applicable. 6. Standard 6 is related to projects with stormwater discharging into a critical area, a Zone It or an Interim Wellhead Protection Area of a public water supply. a. The proposed project is not located within a critical area therefore Standard 6 is not applicable. 7. Standard 7 states that a redevelopment project is required to meet the following Stormwater Management Standards only to the maximum extent practicable: Standard 2, Standard 3, and the pretreatment and structural best management practice requirements of Standards 4, 1 I'.11'rrrjc3cts;1 O18N WOGfi N ArItlover OII CajII 1806!& Saleni `_,WmA\R(-� olIsk1901521_'1 s1}'eer FZc:vu,ty".3,11ein&1ft;r:1,(1t}ttX i Town of North Andover May 21, 2019 Page 4 of 5 5, and 6. Existing stormwater discharges shall comply with Standard 9 only to the maximum extent practicable. A redevelopment project shall also comply with all other requirements of the Stormwater Management Standards and improve existing conditions. a. The proposed project is not considered a redevelopment therefore Standard 7 is not applicable. & Standard 8 requires a plan to control construction related impacts including erosion, sedimentation or other pollutant sources. a. HW recommends that a schedule for sequencing construction and stormwater management activities be added to the Erosion Control Plan. b. HW recommends that the following items be added to the Erosion Control Plan: • Add silt sacks to the three on-site catch basins that are to remain; • Clarify whether the existing stormwater basin is intended to receive runoff from dewatering operations; and • Add protection for the remaining trees in the south-west border of the property. Clarify which trees need to be pruned to facilitate construction. c. The North Andover Stormwater Management and Erosion Control Bylaw requires that the following items be added to the Erosion Control Plan: • Path and mechanism to divert uncontaminated water around disturbed areas, to the maximum extent practicable; • Locations for storage of materials, waste, vehicles, equipment, soil, snow and other potential pollutants; and • Locations of any proposed dewatering facilities. d. The Town of North Andover in the Stormwater Management and Erosion Control Regulations requires that the following additional conditions be added to the Sediment and Erosion Control Plan: • Measures used to maintain the infiltration capacity of existing soils where any kind of infiltration is proposed; • Sediment from sediment traps or sedimentation ponds to be removed when it reaches a depth of six inches; • Topsoil shall be stripped from disturbed areas, stockpiled in approved areas and stabilized with temporary vegetative cover if it is to be left for more than 30 calendar days; and • Soil stockpiles must be stabilized or covered at the end of each workday. Stockpile side slopes shall not be greater than 2:1. a Temporary seeding, mulching or other suitable stabilization methods shall be used to protect exposed soil areas during construction; as feasible, natural vegetation shall be retained and protected; during the months of October through March, when seeding may be impractical, an anchored mulch or sod shall be applied as approved by the I I:Piojccts120111118065 N Ar6ovei Orr-Call\180o5F Salem Strf"'(.' eprsrts1190521,_,1st peer Review' mi streetclocx i i Town of North Andover May 21, 2019 Page 5 of 5 Planning Board or by its designee; diversions and/or prepared outlets may be required in critical areas during construction. • Permanent seeding shall be undertaken in the spring from March through May, and in late summer and early fall from August to October 15. During the peak summer months and in the fall after October 15, when seeding is found to be impractical, appropriate temporary mulch shall be applied. Permanent seeding may be undertaken during the summer if plans provide for adequate mulching and watering. 9. Standard 9 states that a long-term operation and maintenance (O&M) plan shall be developed and implemented to ensure that stormwater management systems function as designed. a. The Applicant has provided an Operation & Maintenance Plan, dated March 27, 2019. The Applicant complies with Standard 9. 10. Standard 90 requires an Illicit Discharge Compliance Statement to be provided. a. The Applicant has provided an Illicit Discharge Compliance Statement. HW recommends that the Illicit Discharge Compliance Statement be signed by the property owner prior to land disturbance. Conclusions HW recommends that the Planning Board require the Applicant to address these comments as part of the Board's review process. The Applicant is advised that provision of these comments does not relieve him/her of the responsibility to comply with all Town of North Andover Codes and By-Laws, Commonwealth of Massachusetts laws, and federal regulations as applicable to this project. Please contact Janet Bernardo at 774-413-2999 ext 202 or at jernardo@horsleywitten.com if you have any questions regarding these comments. Sincerely, HORSLEY WITTEN GROUP, INC. Janet Carter Bernardo, P.E. Maria Pozimski Senior Project Manager Staff Planner I 11106!e N Andover OtI CaIIH1'4065I £3almII"Aco lR(,'tItI�Ns I9Ui2l 1st f W-wi(ilm S<olain Stine IA(w„C i i I i i Horsley Witten Group Sustainable Environmental Solution 294 Washington Street•Suite 804•Boston,M) 02408 857-263.8193•horsleywitten.com July 10, 2019 Ms. Monica Gregoire, Staff Planner Planning Department Town of North Andover 120 Main Street North Andover, Massachusetts 01845 Ref: Second Stormwater Peer Review Proposed Mixed Use Expansion 695 & 701 Salem Street, North Andover, MA 01845 Dear Ms. Gregoire 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 Report and permitting plans for the proposed construction of a new 8,700 square foot(sf) building expansion with 70 parking spaces, landscaping and stormwater improvements at 695 & 701 Salem Street in North Andover, MA. The stormwater design was prepared by Civil Design Group, LLC for Virginia, Inc. (Applicant). HW understands that the Applicant is proposing to raze one existing building and part of a second existing building and construct a building expansion, with associated parking area and stormwater management on a 1.41-acre site. No part of the project is within a wetland resource area or associated buffers. The following additional documents and plans were received by HW in response to our May 21, 2019 initial peer review: • Stormwater Management Report for Proposed Mixed Use Expansion, 695 & 701 Salem Street, North Andover, MA 01845, prepared for: Virginia, Inc., prepared by Civil Design Group, LLC, dated April 4, 2019, Revised June 25, 2019; and • Site Plan Set for Proposed Mixed Use Expansion, 695 & 701 Salem Street, North Andover, MA, 01845, prepared by Civil Design Group, LLC, which include: o Cover Sheet 1 (06/25/2019) o Boundary, Topographic & Utility Survey 2 (06/19/2019) o Demolition and Erosion Control Plan 3 (06/25/2019) o Site Plan 4 (06/25/2019) o Grading & Drainage Plan 5 (06/25/2019) o Utility Plan 6 (06/25/2019) o Landscape Plan 7 (04/04/2019) o Construction Details 8 (06/25/2019) o Construction Details 9 (06/25/2019) o Construction Details 10 (06/25/2019) Horsley%ften.corn t Hors*WittenGroup IM Horsley Witten Group, Inc. Town of North Andover July 10, 2019 Page 2 of 7 o Construction Details 11 (06/25/2019) o Construction Details 12 (06/25/2019) o Floor and Roof Plan A100 (06/24/2019) o Building Elevations A101 (06/24/2019) o Site Photometrics E-1.0 (06124/2019) o Lumens Rendering E-2.0 (06124/2019) Stormwater Management Design Peer Review The comments below correlate to our initial review dated May 21, 2019. Follow up comments are provided in bold font. 1. Standard 1 states that 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 has proposed two subsurface infiltration systems to manage the proposed stormwater runoff from the building expansion and the additional parking area. The eastern half of the pavement area will continue to discharge to the closed drainage system within the parking lot that discharges to an existing detention basin located at the corner of Abbot Street and Salem Street. The Applicant has reduced the runoff to the municipal system and complies with Standard 1. HW recommends that for documentation purposes the Applicant clarify where the existing municipal system eventually discharges. The Applicant states that the stormwater runoff collected in the municipal system ultimately discharges into Mosquito Brook. HW is satisfied. 2. Standard 2 states that 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 modeling calculations for the 2-yr, 10-yr, 25- yr and 100-yr storm events. The North Andover Stormwater Management Regulation Section 7.2.B.b also requires an analysis of a 0.5-inch storm. HW recommends that the Applicant provide the missing analysis. The Applicant provided the HydroCAD output for the 0.5-inch storm. HW is satisfied. b. The Applicant has indicated that the stormwater runoff from the proposed building roof will be collected via a pipe and directed to the subsurface infiltration system. HW recommends that the Applicant include a detail of the roof leaders and means to overflow if the subsurface system backs up. The Applicant provided a detail of the roof leader on Sheet A100. HW is satisfied. c. The Applicant has not provided the details or labeled the locations of the clean out ports for the subsurface structures. According to the North Andover Stormwater Management and Erosion Control Bylaw, Section 7.2.D.f. adequate access must be provided to all 11£ivr-{d 18061)N Andover On-G'ahk I 8065F Salem SlreetlCiehaits119U71U_2n[1 Peer Review Satern Slrc,et.dooX 3 j Town of North Andover July 10, 2019 Page 3 of 7 water quality BMP's for inspection and maintenance. HW recommends adding the clean out port details and labels to the site plans. The Applicant has added access manhole labels and details for the subsurface structures to allow for maintenance. HW is satisfied. d. The Applicant has provided data and locations of five test pits. However, MSH Vol. 2, Ch. 2, p. 104 requires that the Applicant provide at least two test pits at the location of the infiltration practices. To verify the estimated seasonal high ground water elevation is accurate, HW recommends that the Applicant provide two more test pits in the location of the subsurface infiltration systems. The Applicant has requested that additional test pits be conducted at the time of construction as to limit any disturbance to the current store operations. The Applicant also states that at that time if seasonal high groundwater is identified at a higher elevation than assumed, the infiltration system design will be modified accordingly and submitted to the Town for review and approval. Based on review of the existing conditions plan and the proposed locations of the subsurface infiltration systems, both systems are located in areas of existing lawn or vegetation that are not currently utilized for the operation of the existing building use. Therefore, HW believes that conducting the test pits prior to construction is feasible and recommended. However, if the Board wishes to grant the Applicant's request, HW recommends that the Board condition the permit such that construction of the infiltration practices cannot be initiated until the test pit results have been reviewed and approved by the Board. e. HW recommends that the Applicant verify that stormwater runoff from the proposed development does not flow west of the limit of work. The topography is limited in this area and HW is not able to confirm that the western property boundary will not be impacted by the development. The Applicant indicates that the survey is limited In the area to the west due to obscurities by overgrown vegetation. The Applicant notes that runoff areas contributing to that portion of the site will be less than the existing condition and will have no contributing runoff from impervious surfaces. HW is satisfied. f. The Applicant has included a storm sewer inventory report detailing a slope of less than 0.5%for the pipe between C131 and DMH1. HW recommends that the Applicant confirm that this pipe will have adequate cleansing velocity. The Applicant has chosen to increase the slope of the pipe between CB1 and DMH1 from 0.5% to 0.9%, which would provide adequate cleansing velocity. HW is satisfied. g. The Applicant has labeled EXCB1 with two separate leaders with different rims and inverts. HW recommends that the Applicant revisit this structure and correct the discrepancy. The Applicant has removed duplicate leaders. HW is satisfied. 11hw 1'1Ie24�PN «rv<�rlProjer,la12f31811tSOCi5 N Andover 011 Gall\IBOW- Saiefn SI eeRWipoils Il,'W10-)rid Pt-.or Revi.w SalE:m S(rF4F;L(igGX Town of North Andover July 10, 2019 Page 4 of 7 3. Standard 3 states that the annual recharge from post-development shall approximate the annual recharge from pre-development conditions based on soil type. a. The Applicant has provided adequate recharge for the additional impervious area. The existing stormwater basin includes an outlet at the bottom of the basin. HW recommends that the Applicant explore the possibility of retrofitting this basin to allow for additional recharge from the existing impervious area. The Applicant has stated that it does not wish to retrofit the existing basin to allow for additional recharge as it is functioning as designed. HW is satisfied. 4. Standard 4 states that the stormwater management system shall be designed to remove 80% of the average annual postconstruction load of Total Suspended Solids (TSS) and is sized to treat 1.0-inches of volume from the impervious area for water quality. a. The Applicant has provided water quality calculations for 0.5 inches of runoff. However, as the Applicant is using an infiltration rate of 8.27 inlhr for sand, it is required to treat 1- inch of volume over the impervious area for water quality. HW recommends adjusting the calculations accordingly. The Applicant has provided water quality calculations for 1.0 inch of runoff. HW is satisfied. 5. Standard 5 is related to projects with a Land Use of Higher Potential Pollutant Loads (LUHPPL). a. The proposed project is not considered a LUHPPL therefore Standard 5 is not applicable. No response required. 6. Standard 6 is related to projects with stormwater discharging into a critical area, a Zone 11 or an Interim Wellhead Protection Area of a public water supply. a. The proposed project is not located within a critical area therefore Standard 6 is not applicable. No response required. 7. Standard 7 states that a redevelopment project is required to meet the following Stormwater Management Standards only to the maximum extent practicable: Standard 2, Standard 3, and the pretreatment and structural best management practice requirements of Standards 4, 5, and 6. Existing stormwater discharges shall comply with Standard 1 only to the maximum extent practicable. A redevelopment project shall also comply with all other requirements of the Stormwater Management Standards and improve existing conditions. a. The proposed project is not considered a redevelopment therefore Standard 7 is not applicable. No response required. 8. Standard 8 requires a plan to control construction related impacts including erosion, sedimentation or other pollutant sources. 111��^1-fde21i1��1 Seiverlf'snjecLsti2f)I811800b fd Andover On CA191IR1G51. Sale[n Stu:at\ReporlAIf107I0-2nd f'eer ReviewS,']I("m Slreel,dacx 3 1 i Town of North Andover July 10, 2019 Page 5 of 7 a. HW recommends that a schedule for sequencing construction and stormwater management activities be added to the Erosion Control Plan. The Applicant added an estimated construction sequence to the Demolition & Erosion Control Plan. HW is satisfied. b. HW recommends that the following items be added to the Erosion Control Plan: • Add silt sacks to the three on-site catch basins that are to remain; The Applicant has added a call out to the existing catch basins. HW is satisfied. E • Clarify whether the existing stormwater basin is intended to receive runoff from dewatering operations; and The Applicant states that the General Contractor, when selected, will be responsible for determining dewatering operations. HW recommends that the Board include a condition that water from dewatering operations cannot be discharged to the existing stormwater basin without adequate treatment. • Add protection for the remaining trees in the south-west border of the property. Clarify which trees need to be pruned to facilitate construction. The Applicant included a 4-foot high construction fence and notes to the drawings to indicate that trees to remain shall be protected. HW is satisfied. c. The North Andover Stormwater Management and Erosion Control Bylaw requires that the following items be added to the Erosion Control Plan: • Path and mechanism to divert uncontaminated water around disturbed areas, to the maximum extent practicable; The Applicant added a diversion berm along the northwest border of the site to divert uncontaminated water away from disturbed areas. HW is satisfied. • Locations for storage of materials, waste, vehicles, equipment, soil, snow and other potential pollutants; and The Applicant has added a note to the drawings asking the owner to depict the anticipated locations of these materials. HW recommends that the Applicant include the anticipated locations on the construction related items on the plan with an understanding that the plan can be updated during construction to depict the actual location of these materials. • Locations of any proposed dewatering facilities. The Applicant added a note indicating that the locations of dewatering facilities would be provided by the Contractor and water would be discharged to a sediment basin. HW recommends that the Applicant provide a standard detail for a sediment basin on the plans. d. The Town of North Andover in the Stormwater Management and Erosion Control Regulations requires that the following additional conditions be added to the Sediment and Erosion Control Plan: i lll� -(ilt,7_lli�ll Servr:rlf'rojecLsl2U'I811806,N Awfover Ort-Call1180651=Salerno- 100710-.-2nd Peer Roviety Salom S1�t14F,doCY. Town of North Andover July 10, 2019 Page 6 of 7 • Measures used to maintain the infiltration capacity of existing soils where any kind of infiltration is proposed; The Applicant added a note (#16) to Sheet 5 indicating that the area below the infiltration systems should be left uncompacted and scarified prior to installation. HW is satisfied. • Sediment from sediment traps or sedimentation ponds to be removed when it reaches a depth of six inches; The Applicant added a note (#46) to Sheet 2. HW is satisfied. o Topsoil shall be stripped from disturbed areas, stockpiled in approved areas and stabilized with temporary vegetative cover if it is to be left for more than 30 calendar days; and The Applicant added a note (#47) to Sheet 2. HW is satisfied. . Soil stockpiles must be stabilized or covered at the end of each workday. Stockpile side slopes shall not be greater than 2:1. The Applicant added a note (#48) to Sheet 2. HW is satisfied. • Temporary seeding, mulching or other suitable stabilization methods shall be used to protect exposed soil areas during construction; as feasible, natural vegetation shall be retained and protected; during the months of October through March, when seeding may be impractical, an anchored mulch or sod shall be applied as approved by the Planning Board or by its designee; diversions and/or prepared outlets may be required in critical areas during construction. The Applicant added a note (#49) to Sheet 2. HW is satisfied. • Permanent seeding shall be undertaken in the spring from March through May, and in late summer and early fall from August to October 15. During the peak summer months and in the fall after October 15, when seeding is found to be impractical, appropriate temporary mulch shall be applied. Permanent seeding may be undertaken during the summer if plans provide for adequate mulching and watering. The Applicant added a note (#50) to Sheet 2. HW is satisfied. 9. Standard 9 states that a long-term operation and maintenance (OW) plan shall be developed and implemented to ensure that stormwater management systems function as designed. a. The Applicant has provided an Operation & Maintenance Plan, dated March 27, 2019. The Applicant complies with Standard 9. No response required. 10. Standard 10 requires an Illicit Discharge Compliance Statement to be provided, a. The Applicant has provided an Illicit Discharge Compliance Statement. HW recommends that the Illicit Discharge Compliance Statement be signed by the property owner prior to land disturbance. Illnv-file�tHN!-5erveriPr<�jet;ls�201fs11t3f)43Fi N An0over On-QallM1065F Salem SheetfRopoits1190110_2nd Peet Review Salem Street.dou I I I Town of North Andover July 10, 2019 Page 7of7 The Applicant states that a signed Illicit Discharge Compliance Statement has been included for the Town's records. A copy of this signed letter was not included in the materials provided. HW recommends that the Board confirm that this statement has been provided to the Town. Conclusions HW recommends that the Planning Board require the Applicant to respond to the few remaining comments as part of the Board's review process. The Applicant is advised that provision of these comments does not relieve him/her of the responsibility to comply with.all Town of North Andover Codes and By-Laws, Commonwealth of Massachusetts laws, and federal regulations as applicable to this project. Please contact Janet Bernardo at 774-413-2900 ext 202 or at jernardo@horsleywitten.com if you have any questions regarding these comments. Sincerely, HORSLEY WITTEN GROUP, INC. ( Itl elf,a— Janet Carter Bernardo, P.E. Renee L Bourdeau, PE Senior Project Manager Senior Water Resources Engineer WIV)41Ie+Al IVtil ItA1806!)N AiidI)ver 01)CAR �i]IeiiI Slrrx>}11Zc,ppils1IfXU10_2Ild I'i;nt kovic�%V Saklfl ,A('wa.doCx i I