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HomeMy WebLinkAbout03/26/2025 - Gale Response to PB - - 430 OSGOOD STREET LE Gale Associates, Inc. ��III µ � i 111 iii N III °'III 111 I SUt 0 1 III Ilf 781.335.6465 III 781.335.6467 www.gainc.com March 26, 2025 Ms. Jean Enright, Director North Andover Planning Department Town of North Andover 120 Main Street North Andover, MA 01854 Re: Response to Review Comments Application for Limited Site Plan Review North Andover High School (NAHS)Athletic Field Improvements Gale J N 719560 Dear Ms. Enright and Planning Board Members: On behalf of The Town of North Andover (Town), Gale Associates, Inc. (Gale) is providing the following response to verbal comments provided by the North Andover Planning Board (NAPB) at the hearing on March 18, 2025, as well as the second round of written comments provided via email by Horsley Witten Group (HW) on March 14, 2025, regarding the above referenced project. Plan and document changes resulting from the comments have been incorporated into the accompanying submittal. (Responses to comments are provided in bold text below.) RESPONSE TO MARCH 18T"VERBAL BOARD MEMBER INQUIRIES: The following are Gale's responses to verbal comments and directives provided by members of the NAPB at the March 181" hearing, recorded per Gale's understanding and interpretation. 1. Can proposed athletic light poles S9 and S10, located on the east side of Farese track, be shifted west toward the center of the track to improve the zero horizontal footcandle delineation line with respect to the eastern abutter properties? Gale's Response: Athletic Light Poles S9 and S10 could feasibly be moved closer to the track, approximately one-hundred and fifty-five feet (155')from the center of the existing turf field, in kind with Athletic Light Poles S11 and S12. This could potentially improve the zero horizontal footcandle delineation line as it relates to the eastern abutter properties, however, the proposed light tower height of eighty feet (80') would remain unchanged. As the geotechnical boring investigation has already been performed in accordance with the original locations of Poles S9 and S10, relocating these poles approximately thirty- five feet (35') away introduces the risk of unknown subsurface conditions in the newly North Andover Planning Boardw Response to Review Comments LE' ,I,,Application for Limited Site Plan Review-NAHS Athletic Field Improvements �� .°° March 26, 2025 Page 2 proposed location. If subsurface conditions in the newly proposed areas vary significantly, this may require redesign of the pole foundations during construction, at additional cost to the Owner via change order. To avoid this scenario during construction, two (2) new borings would need to be performed at the new locations prior to bidding of this project, also at additional cost to the Owner and resulting in a significant impact to the bid and construction timeline. It is Gale's opinion that both scenarios create undue cost and schedule burdens on the Owner relative to the minor potential shift in horizontal footcandle delineations. 2. Would it be feasible to install single towers at both ends of the field, within the running track D-areas, in lieu of the proposed locations in the four outside corners? Gale's Response: Locating athletic lighting poles in the running track D-areas, at the north and south end of the existing turf field, would create glare zones for soccer players, per the Illuminating Engineering Society of North America (IESNA). Additionally, poles at these locations would likely need to be installed taller than the currently proposed eighty-foot (80') height in order to control light spillage outside of the field limits. This lighting scheme would also fail to provide adequate ball lighting for player use and safety, as only two sides of the ball would be illuminated. This is one of the primary reasons for the four-corner lighting design, as it provides illumination on all sides of the ball and players, necessary for player use and safety. 3. Have low level or temporary athletic lighting options been considered? Gale's Response: Low tower lighting would require at least ten (10) towers, in lieu of the currently proposed four (4), to provide sufficient field lighting. Lower lighting would significantly increase horizontal footcandle spillage and glare conditions outside of the field limits. Please refer to Enclosure No. 1 for a visual representation of light tower heights and spill of light. Low level lighting, below sixty feet (60% will not meet Dark Sky requirements. If the desired horizontal footcandle perimeter cut offs and Dark Sky requirements could be met with tower heights lower than those proposed, this would be pursued, but this is not the case. Regarding temporary lighting systems, it should be noted each tower would require its own generator, a significant source of noise pollution that will not be present with the proposed design. This is in addition to the fact that a lower, temporary system would not meet Dark Sky or glare constraints, as described above. 4. Could the addition of parallel parking striping be considered along the High School access drive, directly west of the tennis courts? North Andover Planning Boardw Response to Review Comments LE' ,I,,Application for Limited Site Plan Review-NAHS Athletic Field Improvements �� .°° March 26, 2025 Page 3 Gale's Response: The full length of the access drive is currently demarcated with "No Parking" signage. It is Gale's understanding from North Andover High School and Town of North Andover representatives this access drive is too narrow to allow for sanctioned parallel parking, particularly with respect to bus traffic. Parking striping will not be proposed as a part of this project. Members of the public who wish to utilize the tennis courts will be required to park at the upper High School parking lot and walk to the courts via the existing sidewalk and proposed tennis court crosswalk and pedestrian path. 5. Has the proposed tennis court height been discussed with the North Andover Conservation Commission? Is there the potential for additional netting or fence height in an effort to reduce tennis ball migration outside of the courts? Gale's Response: As discussed in response to Question 5 of the previous response package to this Board, issued March loth, additional fencing height or the addition of netting above the fence may only marginally decrease the number of tennis balls existing the courts, as the height and launch angle of all wayward hits may not be addressed. Any increase in fence height or additional safety netting will result in significant project cost increases and require larger foundations and more significant excavation and earthwork requirements, relative to what is currently proposed. This matter is being discussed with the Conservation Commission as part of the Notice of Intent process, and an ongoing/perpetual condition is expected to be implemented that would require the school to perform regular clean-up of tennis balls in the areas surrounding the courts. 6. Could signage be added to the proposed reconstructed fence section east of the Farese track, indicating land to the east is privately owner? Gale's Response: "No Trespassing" signage has been added to the proposed reconstructed fence section. Please refer to Enclosure No. 2 for reference. 7. Could additional information be provided specific to the proposed lighting fixtured and their associated shielding design? Gale's Response: Additional information has been provided, please refer to Enclosure No. 3 for reference. North Andover Planning Boardw Response to Review Comments LE' ,I,,Application for Limited Site Plan Review-NAHS Athletic Field Improvements �� .°° March 26, 2025 Page 4 8. Is there currently proposed pedestrian lighting along the walkway between the Farese track and Chickering Road? Gale's Response: There is no proposed pedestrian lighting in the project scope for this walkway. This walkway is more specifically intended as an emergency access drive from the Fire Station to the upper High School parking lot. The addition of pedestrian lighting to this route is a determination that must be made by the School Department, separate from this project. 9. The current limits of fencing reconstruction east of the Farese track terminate at the fifty-foot (50') No Build Zone. Would the North Andover Conservation Commission consider allowing the reconstruction of additional length of the existing, damaged fence run within the resource area buffer zone to provide an additional property barrier for the abutters? Gale's Response: Gale will inquire with the North Andover Conservation Commission on this item at the next hearing,scheduled for April 9, 2025. RESPONSE TO MARCH 14T" HORSLEY WITTEN GROUP SECOND ROUND STORMWATER PEER-REVIEW COMMENTS: The following are Gale's responses to recommendations provided in the review comment letter prepared by the Horsley Witten Group (HW) dated March 14, 2025. A copy of this review letter has been included in this submittal, under Enclosure No. 4. 4b.The applicant has noted that the runoff from Wayne Street will continue to be managed in the same way it is under existing conditions. HW notes that it would be beneficial to the wetlands if there is any opportunity to provide additional treatment prior to flowing into the wetlands. Gale's Response: Excluding the relocation and reconstruction of the existing curb cut to outside of the fifty- foot (50') No Build Zone, and the addition of a new curb cut for emergency vehicle access to the proposed baseball field, there are no improvements proposed within the existing Wayne Street travel lanes, inside of the existing curb limits. As such, it is Gale's opinion the existing stormwater management design remain undisturbed. North Andover Planning Boardw Response to Review Comments LE' ,I,,Application for Limited Site Plan Review-NAHS Athletic Field Improvements �� .°° March 26, 2025 Page 5 The only apparent feasible improvement to provide additional treatment prior to exit into the wetlands would be the replacement of the existing drain manhole (RIM = 97.12') directly upstream of the 24" CMP outfall (EL = 91.16") with an outlet control structure or similar system. This would require significant additional excavation efforts within the twenty-five foot (25') No Disturb Zone and two-hundred foot (200') Riverfront Buffer, relative to currently proposed improvements. It should be noted this project proposes the removal of the existing, unsanctioned gravel parking area and the creation of a protected vegetative buffer throughout the fifty-foot (50') No Build Zone from the access drive to the existing Walsh Stadium Field. It is Gale's opinion this approach provides significant additional stormwater treatment relative to current conditions and with respect to the proposed limit of work. 8.a. The applicant has acknowledged that a Stormwater Pollution Prevention Plan (SWPPP) is required by EPA and noted that the contractor will provide a SWPPP for construction related activities prior to the start of construction. The Planning Board may choose to require a final signed SWPPP a minimum of 14 days prior to land disturbance. This is a suggested condition of approval. Gale's Response: It is anticipated this item will be conditioned by the Planning Board. Unless otherwise directed or conditioned, the requirement that the contractor must provide proper SWPPP documentation prior to construction will be included in the project bid documents. 9.a. Horsley Witten recommends that the proposed O&M Plan be combined with or be expanded to include the stormwater practices for the entire High School campus. Gale's Response: It is anticipated this item will be conditioned by the Planning Board. The O&M Plan provided in this Limited Site Plan Review Application is specific to the proposed improvements associated with the project scope, and is expected to be supplementary to the existing O&M requirements for the entire High School campus. 9.b. The Applicant has stated that a simple sketch has been provided. However, Horsley Witten was not able to locate it in the documents received. HW recommends that the Applicant provide a simple sketch with callouts for the various stormwater practices requiring longterm inspections and maintenance. Gale's Response: This sketch plan was unintentionally omitted from the previous response package. Please refer to Enclosure No. 5 for a copy of this document. North Andover Planning Boardw Response to Review Comments LE' ,I,,Application for Limited Site Plan Review-NAHS Athletic Field Improvements �� .°° March 26, 2025 Page 6 9.g. Horsley Witten recommends that the Planning Board consider requesting receipt of a signed O&M Plan as a condition of approval. Gale's Response: It is anticipated this item will be conditioned by the Planning Board. 10.a. Horsley Witten recommends that the Planning Board request receipt of an Illicit Discharge Compliance Statement signed by the Property Owner prior to land disturbance. Gale's Response: In addition to the Illicit Discharge Compliance Statement which will be required to be submitted by the contractor per the forthcoming project bid documents, unless otherwise directed or conditioned, this requirement will be extended to include the provision of a discharge statement from the Property Owner prior to disturbance. It is anticipated this item will be conditioned by the Planning Board. We hope you find our responses to the above comments satisfactory. Please do not hesitate to contact the undersigned, at (781) 335-6465 or kfr@gainc.com, if you have any comments, questions, or require additional information. Best Regards GALE ASSOCIATES, INC. KyIel F. '/R O-Vw aria& '/-Z yaw D. era,�/la& Kyle F. Rowan Ryan D.Thackeray Project Engineer Sr. Staff Designer KFR/RDT/lad Enclosures: 1.Athletic Light Pole Height &Spillage Diagrams 2. Revised Permit Plan Sheet C103 3.Additional Athletic Light Fixture Information 4. Horsley Witten Review Letter- March 14, 2025 5. BMP Exhibit Plan G:\719560\02 Design\permit reports\planning\Response to 2"d NA Review\719560 NA Planning Board Response Memo 2025 0326.docx ENCLOSURE NO. 1 Athletic Light Pole Height & Spillage Diagrams w w IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII Pole height impacts aiming angles and the amount of spill light (21 m) Off site spill light 40' (12 m) ?:j7 .................................. 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©2015 Musco Sports Lighting,LLC M-1886-enUS-2 ENCLOSURE NO. 2 Revised Permit Plan Sheet C103 1 2 3 4 5 6 NORTH l — _ t -, r v. AL -_ �_ Gale Associates,Inc. l f Engineers and Planners f E ' �� T \ z,/ 300 KLAND,A 0 PLACE I SUITE 300 `� "" �_ �� _�/ ROCKLAND,MA 02370 781 335 6465 F 781 335 6467 w g nc com � P ww.ai K Boston Baltimore Orlando Hartford Bedford � F t S : ti t Th ls drawnt edes a,dc construction features disclosed areo prpretaryo Gale Asocaes Inc and shall not he altered or --- _ � roused In who k or pad without the express written pemiissian of Gale Associates,Inc.Copyhght`)2024 VW F r - �r i a _ PERMIT SET S12� - _ D \\� /- l s - -� LIGHTING ) ADD ALTERNATE ATHLETI � L TING(TYP OF 4 J \ U)S9 x J \ rc -- O ``'I' W OHO x W WO w co _"_. w \J Q�� f-° / - - ADD ALTERNATE:+350LF OF 6 FT CHAIN , OLU _ LINK FENCE WITH WINDSCREEN AND"NO _ o LL-O> u d• i J TRESPASSING"SIGNS SPACED AT 100-FT O.C. o p Z 0 iY_ i F r I e f a 0 wO�z ooQ l 2 / s � x.. � N —` O L- C _ I: - _/ 2f 0002 � \ LUO - J - Q O Z F °� - ------------ t - S11 r - X ll % LAYOUT AND MATERIALS N&ES: - � 1. LOAM AND-SEED ALL DISTURBED AREAS. �� : f ................................... \\\ i L, - ARE-AS WITHIN THE 100-FT BUFFER ZONE 'SHALL BE SEEDED WITH NEW ENGLAND 810 /> / CONS ERVATIONANILDLIFE MIX,AS MANUFAC BY NEW ti s / WETLAND TPLANDTS 14 PEARL LANE, 3 >- SOUTH HADLEY,MA,OR APPROVED No. oar DESCRIPTION E D TION BY _ _ _ EQUAL. B K - \ F - PROJECTN 719560 CADD FILED 719560_C101 - -- / f_ - 2. REFER TO ELECTRICAL DRAWINGS FOR DESIGNED BY RDr c� - R v _ D OTHER SUPPLY,CONDUIT,AN LIGHTS, ELECTRICAL WORK. Gc�cl�D By KFDR/Ps J✓, CONCRETE CURB ' \ - DATE 3/10/2025 3. UNLESS NOTED OTHERWISE ALL DRAWING SCALE 1"=30' - IMPROVEMENTS SHOWN HEREON ARE N TO BE INCLUDED IN THE"PHASE 1" GRAPH IC SCALE LID - //� \\/ CONSTRUCTION PERIOD,TENTATIVELY r _ M JUNE TO \, - STONEDUST,F ' 53 OPERATIONAL FRO o a0• 60• ~, CONCRETE PAD DECEMBER 2025. -- SHEETTITLE o ` / 4 TO BE INCLUDED IN THE"PHASE 2" . ATHLETIC LIGHTS S1 S8 ARE � f E CONSTRUCTION PERIOD,TENTATIVELY : - - OPERATIONAL FROM JUNE TO OCTOBER r 1, REWORKED 2026. TRACK l = ;` / \ SHOTPUTAREA /_, LAYOUT MATERIALS U �e� �' n � T& A LAYOUT AND MATERIALS LEGEND PLAN t_- RECESSED CIRCLE WITH s : = TOE BOARD(TYP.OF 2) STONE DUST - - - = - - m ._ - - �~ i \ DRAWING NO. o - - CONCRETE F - - -Y _ jt - C103a ATHLETIC LIGHT__ - _ 14 OF 37 rn LL ENCLOSURE NO. 3 Additional Athletic Light Fixture Information awle 02019 Musco Sports Lighting,LLC U.S.and foreign patents issued and pending M-3046-enO4-1 Solubons for L*ght* Datasheet:TLC-LED-1 200 Luminaire and Driver Luminaire Data Weight(luminaire) 45 lb(20 kg) UL listing number E338094 UL listed for USA/Canada ULI 598 CSA-C22.2 No.250.0 CE Declaration LVD,EMC,RoHS Ingress protection,luminaire IP65 Impact rating IK07 Material and finish Aluminum,powder-coat painted Wind speed rating (aiming only) 150 mi/h(67 m/s) UL,IEC ambient temperature 500C(1 220F) rating,luminaire Photometric Characteristics 25.00 in Projected lumen maintenance per IESTM-21-11 (635 mm) L90(20k) >120,000 h L80(20k) >120,000 h L70(20k) >120,000 h 0 Lumens' 136,000 19.00 in (483 mm) CIE correlated color temperature 5700 K Color rendering index(CRI) 75 typ,70 min LED binning tolerance 7-step MacAdam Ellipse Footnotes: 1)Incorporates appropriate dirt depreciation factor for life of luminaire. 26.00 in (660 mm) 0 24.00 in (610 mm) OCCOU.S.and foreign patent(s)issued and pending-Q2019,2020 Musco Sports Lighting,LLC-TLC-LED-1 200 5700K 75 CRI-M-2943-enO4-5 MC ®R www.musco.com - lighting@musco.com I Datasheet:TLC-LED-1 200 Luminaire and Driver Driver Data Typical Wiring Electrical Data Surge' Rated wattage' protection -------------- Per driver 1170W Controller (if present) Per luminaire 1170W Disconnect Fuse --------1:1+j Ll r_r___M Driver Number of luminaires per driver 0 Starting (inrush)current <40 A,256 ps L2* 4 Luminaire Fuse Fuse rating 15 A UL,IEC ambient temperature rating, 500C(I 220F) If L2(corn)is neutral then not switched or fused. electrical components enclosure t Not present if indoor installation. Ingress protection,electrical I P54 components enclosure Efficiency 95% Dimming mode optional Range,energy consumption 14-100% Range,light output 19- 100% Flicker <2% Total harmonic distortion (THD)at full <20% output 200 Vac 208 Vac 220 Vac 230 Vac 240 Vac 277 Vac 347 Vac 380 Vac 400 Vac 415 Vac 480 Vac 50/60 Hz 60 Hz 50/60 Hz 50 Hz 50/60 Hz 60 Hz 60 Hz 50/60 Hz 50 Hz 50 Hz 60 Hz ---- ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------L-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Max operating current per 7.26 A 6.98 A 6.60 A 6.31 A 6.05 A 5.24 A 4.18 A 3.82 A 3.63 A 3.50 A 3.03 A luminaire 2 Footnotes: 1)Rated wattage is the power consumption,including driver efficiency losses, at stabilized operation in 25T ambient temperature environment. 2)Operating current includes allowance for 0.90 minimum power factor, operating temperature,and LED light source manufacturing tolerances. Notes 1.Use thermal magnetic HID-rated or D-curve circuit breakers. 2.See Musco Control System Summary for circuit information. OCCOU.S.and foreign patent(s)issued and pending-02019,2020 Musco Sports Lighting,LLC-TLC-LED-1 200 5700K 75 CRI-M-2943-enO4-5 MCO®R www.musco.com - lighting@musco.com 2 ENCLOSURE NO, 4 Horsley Witten Review Letter — March 141 2025 H o,r's I ey 'W"iffe n G ro u P Sustainable Enwronnienfral Solutions 1,12'Water Street-61",Floor-Boston,MA 02109 857-263-8193-horsleywiften,com March 14, 2025 Ms. Jean Enright, Planning Director North Andover Planning Board 120 Main Street North Andover, Massachusetts 01845 Ref: Second Stormwater Peer Review North Andover Public Schools North Andover High School Athletic Campus Improvements 430 Osgood Street, North Andover, Massachusetts Mass DEP File No. 242-1906 Dear Ms. Enright and Board Members: The Horsley Witten Group, Inc. (HW) is pleased to provide the North Andover Planning Board with this letter summarizing our second review of the Stormwater Management Report and Site Plans for the proposed athletic field improvements at the North Andover High School located at 430 Osgood Street, North Andover, MA. The Site Plans and Stormwater Management Report were prepared by Gale Associates, Inc. on behalf of North Andover Public Schools (Applicant). The Applicant is proposing to make several improvements to the existing athletic facilities at the North Andover High School campus, including the installation of a multipurpose synthetic turf field with a stone base and subsurface drainage system, reconstruction of existing tennis courts, and installation of a shot put and discus cage. Additional site improvements include new fencing, walkways, athletic lighting, drainage improvements, and wetland restoration. The watershed area evaluated consists of 7.86 acres. Under existing conditions there are 1.40 acres of impervious area that include the tennis courts, concrete pads, sidewalks and a portion of Wayne Street adjacent to the athletic field. Under proposed conditions the impervious area associated with tennis courts, concrete pads, sidewalks, and roadway increases to 1.53 acres. An additional 3.23 acres of synthetic fields are proposed which have been correctly modeled as impervious. A portion of the proposed work site is within the 1 00-foot buffer zone of the onsite bordering vegetated wetland (BVW) and the bank of the intermittent stream located adjacent to the tennis courts. The installation of one light pole is within the 200-foot riverfront area of the Cochichewick River. The proposed work involving the replacement of the tennis courts is within the 25-foot No Disturbance Zone (NDZ) and the 50-foot No-Build Zone (NBZ). The project will require an Order of Conditions from the North Andover Conservation Commission. The proposed stormwater management elements include a stone base system to capture and manage the stormwater from the artificial turf field and replacement of a failed culvert. The following additional documents and plans were received by HW in response to our initial review letter dated February 20, 2025: Response to Comments letter, issued to Jean Enright, prepared by Gale Associates, Inc., dated March 10, 2025, with enclosures (237 pages). Horsley'wi"tten.com ff]@ H o,rs I e yW 1 tteri G ro u p IM Horsley Witten Group, Inc. Town of North Andover March 14, 2025 Page 2 of 9 Stormwater Management Design Peer Review HW offers the following comments concerning the stormwater management design as per the Massachusetts Stormwater Handbook (MSH) dated February 2008, and the North Andover Chapter 165 Stormwater Management and Erosion Control Bylaw (Bylaw), and the Chapter 250 Stormwater Management and Erosion Control regulations (Stormwater Regulations) adopted June 21, 2022. In accordance with Stormwater Regulations, Article V -Applicability, §250-9 activities entailing land disturbance of over 43,560 square feet must obtain a Land Disturbance Permit. In accordance with the Stormwater Regulations, Article VI I - Stormwater Management Plan, §250- 21. B. The Stormwater Management Plan shall be designed to meet the most recent version of the Massachusetts Stormwater Standards. Therefore, we have used the Massachusetts Stormwater Standards as the basis for organizing our comments. However, in instances where the additional criteria established in §250-23 of the North Andover Code require further recommendations, we have referenced these as well. 1. Standard 1: 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 analyzed the pre- and post-development stormwater runoff to three design points (DP). i) DP-1 is the Bordering Vegetated Wetland (BVW) series #2, located southwest of the existing baseball field portion of the site, next to the Chochichewick River. Under existing conditions, it appears that runoff from the existing baseball field sheet flows overland in a southwest direction towards the BVW at DP-1, while a portion of the field drains to Wayne Street, where it flows along the gutter line to an opening in the curb that is sloped towards the wetland. Under proposed conditions, runoff from the synthetic turf field enters the base stone beneath it, where it can infiltrate into the subsurface soils or be conveyed through the subsurface flat panel drains piped to a proposed outlet control structure (OCS) on the southside of the field. The OCS discharges via a 12-inch pipe into an existing DMH. Runoff from the areas surrounding the proposed synthetic turf field continues to flow overland in a southwest direction toward the BVW at DP-1. HW recommends that the Applicant: (1) Confirm where the existing catch basins drain to. March 14, 2025: The Applicant has stated that the existing catch basins are piped towards the 5-series BVW via 24-inch corrugated metal pipes. The approximate locations of the existing pipes have been added to Sheets C001 and C002. No further action is requested. (2) Confirms what the it apparent manhole 5) and it apparent OCS/sediment trap 11 are and where they discharge to (noted on page C001 Baseball Existing Conditions Plan). March 14, 2025: The Applicant has clarified that the apparent manhole and apparent OCS were observed by Gale and located on the existing conditions plan. The structures are piped towards the 5-series BVW via 24- inch corrugated metal pipes. The approximate locations of the existing pipes have been added to Sheets C001 and C002. No further action is \a"") 01 ol(''�11111111�11111111 i K rcijects\2 0,"11! �mri hridover\2,1111�1'1,,0 18,���............ ............ g )5��" 3 11 11 '111) , �'�'111( sd�I q��)0 N e P,1�)rtVii,!!�..,0,'_' I ��Ieerl�� iiilkrib)verl...........1��g��Iscl�Ic)()��'Ajo(j Town of North Andover March 14, 2025 Page 3 of 9 requested. (3) Clarifies the grading and purpose of the proposed3/4-inch stone swale along the north side of the baseball field. March 14, 2024: The Applicant has clarified that an existing infiltration trench is located at the toe of the slope and will remain. The infiltration trench will be amended, and a detail has been added to Sheet C503. No further action is requested. ii) DP-2 is the BVW series#4 and series #7, at the bank of the intermittent stream adjacent to (west of) the tennis court area, a 24-inch failed culvert connects the two wetlands. The intermittent stream flows southerly through a 24-inch culvert into Cochichewick River. The proposed project includes removal of the failed culvert and the restoration of the adjacent wetlands to reestablish the intermittent stream. Under existing conditions, runoff from the existing tennis courts and surrounding area flows northwest into the BVW at DP-2. Under proposed conditions, the surface areas remain largely the same, except for the relocation of the access walkway. March 14, 2025: No further action is requested. iii) DP-3 is the BVW series#8 associated with an intermittent stream that flows southerly along the eastern portion of the property boundary, starting from the area adjacent to (east of) the existing track and field facility, and flowing south past the tennis courts, eventually discharging to the Cochichewick River. Under existing conditions, runoff from the existing shotput venues and surrounding grassed areas flows in an easterly direction into the BVW at DP-3- Under proposed conditions, conditions remain largely the same. March 14, 2025: No further action is requested. 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. HW has reviewed the Existing and Proposed Drainage Conditions figures and the HydroCAD model. The subcatchment areas, surface materials, curve numbers, times of concentrations, and flow patterns appear reasonable. No further action is requested. March 14, 2025: No further action is requested. b. Per §250-23 A. (1) of the North Andover Stormwater Regulations, Low-impact development (LID) site planning and design strategies must be implemented to the maximum extent feasible. The Applicant has incorporated LID techniques in the proposed project, including installation of a stone base and subsurface drainage system for the artificial turf field. HW recommends that the Applicant document other LID options it considered for the Project Area. March 14, 2025: The Applicant has documented the various LID strategies incorporated into the proposed stormwater management system. No further action is requested. 01 ol K rciiects\2 G'111! (5 �mri hridover\2,1111�1'1,,0 18,............ ............ g 1 11' J W��Ieerl��iiiev�ew �Niiiilartl iiilkrib)verl...........1��g��iscl�Ic t\ 5 Town of North Andover March 14, 2025 Page 4 of 9 c. In accordance with §250-23 E. (19) the Applicant must utilize the 24-hour rainfall data taken from National Oceanic and Atmospheric Administration (NOAA) Atlas 14 for the rainfall precipitation depths. These values are 2-year, 3.16 inches; 10-year, 5.00 inches; and 1 00-year, 7.93 inches. The Applicant's rainfall events were obtained from the Northeast Regional Climate Center (NRCC), which differ slightly from the regulations (2- year, 3.13 inches; 1 0-year, 4.79 inches; 1 00-year, 8.83 inches. HW recommends that the Applicant utilize the higher of the two references. HW notes that the Applicant used the 1-year event instead of the 2-year event in the existing conditions model. March 14, 2025: The Applicant has adjusted the precipitation depths used in the HydroCAD model as suggested. No further action is requested. d. HW notes that there is a rectangle on the drawings on the athletic field near the access driveway that appears to be labeled Approx. Location of Subsurface Detention Basin. HW recommends that the Applicant clarify the rectangle and the callout. March 14, 2025: The Applicant has clarified that the rectangle is an existing detention basin that will remain. The top of the structure is between elevations 103.97 and 104.17. It appears that the 12-inch flat panel drains will be installed a few inches above the existing structure. No further action is requested. e. In accordance with §250-23 E. (11) the pre- and post-development peak rates and volumes of stormwater should be calculated. The Applicant has provided the peak flows for the 2-year, 1 0-year, and 1 00-year storm events, as shown in Table 6.2.3 within Section 6 of the application narrative. The hydrology report provides pre-development estimates for 1-year, 1 0-year and 1 00-year events, and post-development estimates for 2-year, 1 0-year and 1 00-year events. HW recommends that the Applicant provides the 2-year estimate for existing conditions. These calculations show that post-development rates do not exceed pre-development rates, with the exception of flows to DP-3 for the 2- year and 1 00-year storm events. However, these differences are negligible. HW has provided the peak flows and peak volumes in the tables below from the hydrology reports provided. The volume of runoff to DP-1 decreases and volumes to DP-2 remain stable. Runoff volumes to DP-3 increase slightly. March 14, 2025: The Applicant has adjusted the HydroCAD model. HW has updated the tables below. No further action is requested. Design Point - 1 Storm Existing Flow Proposed Flow Existing Proposed Frequency Rate (cfs) Rate (cfs) Volume (af) Volume (af) 2-Yr (3.16") 2.13 1.84 0.271 0.212 10-Yr (5.0") 6.78 5.55 0.779 0.690 1 00-Yr (8.83") 17.89 15-13 2.171 2.044 \a"") 01 ol(`�11111111�11111111 i K rciiects\2 G'111! �mri Aridover\2,1111�1'1,,0 18,���............ ............ g )5��" 3 11 11 111) , ��,111( sd�I q��)0 N e P,1�)rtVii,..,0,,I-, I ��Ieerl�� iiilkrib)verl...........1��g��Iscl�Ic Town of North Andover March 14, 2025 Page 5 of 9 Design Point - 2 Storm Existing Flow Proposed Flow Existing Proposed Frequency Rate (cfs) Rate (cfs) Volume (af) Volume (af) 2-Yr (3.16") 3.14 3.14 0.215 0.215 10-Yr (5.0") 4.81 4.81 0.371 0.371 1 00-Yr (8.83") 7.88 7.88 0.693 0.693 Design Point - 3 Storm Existing Flow Proposed Flow Existing Proposed Frequency Rate (cfs) Rate (cfs) Volume (af) Volume (af) 2-Yr (3.16") 0.51 0.57 0.037 0.041 10-Yr (5.0") 1.05 1.12 0.082 0.088 1 00-Yr (8.83") 2.12 2.19 0.188 0.196 3. Standard 3 requires that the annual recharge from post-development shall approximate annual recharge from pre-development conditions. a. The Applicant has conducted 5 test pits within the proposed artificial turf field area. The test pits indicate refusal between 4.5 to 5 feet from the surface, due to the density of the glacial till present throughout the site. Redoximorphic features were observed in TP-5 at 2 feet below the surface. The Test Pit Memo from Nobis notes that they encountered a perched water table and at test pit TP-3 it seeped into the bottom of the test pit resulting in over a foot of standing water. There are no test pits within the other athletic facility areas, but a total of eighteen (18) test borings at the proposed lighting locations are planned and in progress, including 4 at the track field, 2 at the stadium, 8 at the proposed synthetic turf field, and 4 at the tennis courts. HW recommends that the Applicant provide the results of the additional borings once completed. March 14, 2025: The Applicant has included as Enclosure 5, the updated Geotechnical Engineering Report, prepared by Nobis Group, dated February 28, 2025. No further action is requested. b. The Applicant has included recharge calculations in Section 6.3 of the Stormwater Report indicating that the total amount of impervious surface in the Project Area of 66,647 sf, requires 1,002 cubic feet of recharge volume. The Applicant has stated that it is providing approximately 44,865 CF of storage. The HydroCAD model indicates that the Turf Base Stone field has available storage of 32,465 CF. HW recommends that the Applicant clarify the value of 44,865 CF. March 14, 2025: The Applicant has adjusted the calculations in Section 6.3 and has confirmed that the available storage provided will be 32,465 CF. No further \a"")1,11101�I(''�11111111�11111111 I K rciiects\2 0,"11! �mri hridover\2,1111�1'1,,0 18,���............ ............ g -1 11,11,11,1111���g hscl�lo, r 11!!')'t 5 O'l !�"11 \............�' %, ��rl( W iiilk� bwer l d 0("d Town of North Andover March 14, 2025 Page 6 of 9 action is requested. c. The Applicant has provided a detail of the Turf Field sections on Sheet C503. HW recommends that the Applicant add elevations to the sections. The Applicant has included a note on Detail 1 stating that the trenches shall be over excavated by 12 inches in all directions. HW recommends that the Applicant clarify the estimated elevation of the perched water table and confirm it will over excavate below it. March 14, 2025: The Applicant has added a note to Sheet C503 requiring the contractor to over excavate to a depth at least 12 inches below the perched water table. No further action is requested. d. The Applicant has noted that the bottom of the turf field's base stone is 2 feet above the estimated seasonal high groundwater (ESHGW) table. HW was not able to confirm the ESHGW and request that the Applicant clarify how it was determined. March 14, 2025: The Applicant has documented how it was determined that the base stone will be a minimum of 2 feet above the ESHGW table. Considering the over excavation of the perched water table, HW concurs with the Applicant's response. No further action is requested. e. HW recommends that the Applicant clearly address questions raised by the Conservation Agent regarding how the stormwater infiltrating through the proposed artificial turf field will behave over the dense layer of glacial till that is present throughout the site. March 14, 2025: The Applicant has documented how it anticipates the stormwater will flow through the system. Including the over excavation and the proposed stone base, HW concurs with the Applicant's response. No further action is requested. f. HW notes that in the Nobis Engineering Geotechnical Report the saturated hydraulic conductivity rate for TP-4 is listed as 0.463 iph within the glacial till layer. Further noted by Nobis is that the MassDEP Stormwater Standard requires a minimum factor of safety of 2 be applied to field-derived values. In accordance with Volume 3, Chapter 1, page 13 of the MSH, HW recommends that the Applicant use an exfiltration rate of 1/2 times 0.463 iph (0.2315 iph) in the HydroCAD model and in the drawdown calculations. March 14, 2025: The Applicant has adjusted the exfiltration rate used in the HydroCAD model. No further action is requested. 4. Standard 4 requires that the stormwater system be designed to remove 80% Total Suspended Solids (TSS) and to treat 1-inch of volume from the impervious area for water quality. a. The Applicant has provided a TSS worksheet within the Pre and Post Development Hydrology Reports (see Attachment 7 of Application). The TSS worksheet illustrates that the proposed synthetic turf field will provide 80% TSS removal with the proposed infiltration basin. HW concurs with the percent removal as designed. March 14, 2025: No further action is requested. \a') 01 ol K rciiects\2 G'111! �mri Aridover\2,1111�1'1,,0 18,���............ ............ g -1 11,11,11,1111���g hscl�lo, sd� pll�e t\ 5��" Ir �,0:1 W iiilk� bwer 0 d 0("d 1,, Town of North Andover March 14, 2025 Page 7 of 9 b. The Applicant has noted that the impervious area proposed within the Project Area consists of sidewalks, tennis courts and concrete pads that are not subject to vehicle loading. HW notes that an existing section of Wayne Street is within the catchment area. It is not clear how this portion of the road is being managed and if there is any opportunity to treat this runoff prior to discharging into the wetland. March 14, 2025: The Applicant has noted that the runoff from Wayne Street will continue to be managed in the same way it is under existing conditions. HW notes that it would be beneficial to the wetlands if there is any opportunity to provide additional treatment prior to flowing into the wetlands. c. HW recommends that the Applicant address the Phosphorous removal calculations in accordance with §250-23 C. (1) of the North Andover Stormwater Regulations. March 14, 2025: The Applicant has provided the required Phosphorous removal calculations. No further action is requested. 5. Standard 5 is related to projects with a Land Use of Higher Potential Pollutant Loads (LUHPPL). a. The Project Area is not considered a LUHPPL- Standard 5 is not applicable. March 14, 2025: No further action is requested. 6. Standard 6 is related to projects with stormwater discharging into a critical area, a Zone //, or an Interim Wellhead Protection Area of a public water supply. a. The proposed development is not discharging near or into a critical area, Zone 11 or an IWPA area. Standard 6 is not applicable. March 14, 2025: No further action is requested. 7. Standard 7 is related to projects considered Redevelopment. a. This project can be considered a mix of new and redevelopment. The redeveloped portion of the project is required to comply with the Stormwater Management Standards to the maximum extent practicable for Standards 1-6. The increased impervious area is required to comply with the 10 Standards. The Applicant is intending to comply fully with the 10 standards. March 14, 2025: No further action is requested. b. The redevelopment project, as proposed, appears to comply with the Stormwater Management Standards and will improve existing conditions. March 14, 2025: No further action is requested. 8. Standard 8 requires a plan to control construction related impacts including erosion, sedimentation, or other pollutant sources. a. The Applicant has acknowledged that a Stormwater Pollution Prevention Plan (SWPPP) is required by EPA and noted that the contractor will provide a SWPPP for construction related activities prior to the start of construction. The Planning Board may choose to require a final signed SWPPP a minimum of 14 days prior to land disturbance. March 14, 2025: Suggested condition of approval. \a"") 01 ol r(Diiects\2 0"11! �mri hridover\2,1111�1'1,,0 18,���............ ............ g 1 11' J W��Ieerl��iiiev�ew �Niiiilartl iiilkrib)verl...........1��g��iscl�1C iq�)av�����e�pi� t\ 5��" !�111 11 0 Town of North Andover March 14, 2025 Page 8 of 9 b. The Applicant has included details of a construction entrance, erosion matting, 12-inch silt sock, stockpile area, temporary construction fencing for dust control, loam and seed, and inlet protection as part of the proposed erosion control measures in the Permit Plan Set (Attachment 10). The Erosion Control Plan for each athletic facility shows the locations of silt sock sediment controls and potential stag i ng/stockpile areas. The Operation & Maintenance (O&M) Plan includes further details and directions for erosion control in "Section 1: Construction Activities." March 14, 2025: No further action is requested. 9. Standard 9 requires a Long-Term Operation and Maintenance (0 & M) Plan to be provided. a. The Applicant has provided an Operation and Maintenance Plan as Attachment 8 of the Stormwater Management Report. The O&M Plan can be removed from the Stormwater Management Report and used as a standalone document by the property owner. The North Andover Public Schools may have a separate O&M Plan for the other existing facilities at the High School Athletic Campus, including another artificial turf field that was previously installed. If feasible, combining the O&M Plan for this project with the existing O&M Plan for the entire property would be beneficial. March 14, 2025: HW recommends that the proposed O&M Plan be combined with or be expanded to include the stormwater practices for the entire High School campus. b. HW recommends that the Applicant include a simple sketch with callout for the various stormwater practices that require long term inspections and maintenance. March 14, 2025: The Applicant has stated that a simple sketch has been provided. However, HW was not able to locate it in the documents received. HW recommends that the Applicant provided a simple sketch with callouts for the various stormwater practices requiring long term inspections and maintenance. c. HW recommends that the Applicant specify the party or parties responsible for the routine inspection and maintenance of the BMPs. March 14, 2025: The Applicant has noted that the North Andover Public Schools will be responsible for long-term maintenance. No further action is requested. d. HW recommends that the Applicant include an estimated operations and maintenance budget within the O&M Plan. March 14, 2025: The Applicant has included the estimated budget as suggested. No further action is requested. e. HW notes that the North Andover Conservation Agent has requested that the Applicant specify what maintenance activities, exactly, are included as ii preventative maintenance for the turf field as noted on page 2 of the O&M Plan. March 14, 2025: The Applicant has included maintenance of the Synthetic Turf Field in Part B of the O&M Plan. No further action is requested. \a"") 01 ol(`�11111111�11111111 i K rciiects\2 G'111! �mri hridover\2,1111�1'1,,0 18,���............ ............ g 1 111, J W��Ieerl��iiiev�ew �Niiiilartl iiilkrib)verl...........Hg�hscl�Ic Sc����iq�)av�����e�pi� t\ 5 Town of North Andover March 14, 2025 Page 9 of 9 f. HW notes that the North Andover Conservation Agent has requested that the Applicant specify whether the maintenance of manholes and cleanouts for the synthetic turf field be done with a vacuum truck or another method (see pg. 2 of the O&M Plan). March 14, 2025: The Applicant has noted in the O&M Plan that a vacuum truck is the preferred cleaning method for the catch basins. No further action is requested. g. HW recommends that the Planning Board consider requesting receipt of a signed O&M Plan as a condition of approval. March 14, 2025: Suggested condition of approval. 10. Standard 10 requires an Ifficit Discharge Compliance Statement be provided. a. A template for an illicit discharge compliance statement is included in the Operation and Management Plan. The Applicant has noted that a completed statement will be submitted by the contractor prior to the discharge of stormwater to the postconstruction Stormwater Management System. HW recommends that the Planning Board request receipt of an Illicit Discharge Compliance Statement signed by the property owner prior to land disturbance. March 14, 2025: Suggested condition of approval. Conclusions HW recommends that the Planning Board requires that the Applicant provide a written response to address the few outstanding comments as part of the Board's review process. The Applicant is advised that the 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 508-833-6600 or at jbernardo@horsleywitten.com if you have any questions regarding these comments. Sincerely, HORSLEY WITTEN GROUP, INC. Janet Carter Bernardo, P.E. Principal \a"") 01 ol K rciiects\2 G'111! �mri hridover\2,1111�1'1,,0 18,............ ............ g I J W��Ieerl��iiev�ew �Niiiilartl iiilkribwerl...........1��g��iscl�lo, iq�)av�����e�pi� t\ 5 !�111 0 0("d ENCLOSURE NO, 5 BMP Exhibit Plan 2 3 4 6 ---------- NORTH .......... LE --A---------------- -------------- -------- ---- ----- -----� Q-'�-, - ---- -------- -- ---------- --- ------- -- ----- --- Gale Associates,Inc. 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DATE D ESCRIPTION BY 2 PROJECTNO. 719560 B CADD FILE 71956OC201 7 7\ DESIGNED BY RDT 77\7\� DRAWN BY \\V ROT CHECKED BY KFR PS OUTLET CONTROL STRUCTURE 103 -----------------------------— Z' + DATE 311 O�2025 DRAWING SCALE X GRAPHIC SCALE ---- ------ /001' E 0 ---- ST�N ----- ------ uw C�r5�' ----------------- ------- -'2 EXI G DRAIN MANHOL A�` 30, 60, ----------- ----------- ---------- ------ z 2 SHEETTITLE ----------------- Ob 2 -- ------------ z ep\ -- ----- ---------- ------- ----------- �2 BMP V- 0% -- ---- ----- J- EXHIBIT PLAN -—------------- --------------- . . . -------- ----------- —-------- --— -------- 2 s ML A A- 22 --------------------------------- BMP EXHIBIT PLAN NOTES: DRAWING NO. ",z '�Z5 1. THIS BMP EXHIBIT PLAN SHOULD BE USED IN CONJUNCTION WITH THE OPERATION AND MAINTENANCE PLAN PREPARED BY GALE 2 BMP ASSOCIATES,INC DATED FEBRUARY 2025 FOR BMP MAINTENANCE '2 2- 6� 1 OF 2