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HomeMy WebLinkAboutRecorded Decision - - 243 GREAT POND ROAD Bk 18537 Pg240 #4276 03-24—,ZO6 @ 08 : 06a o� F LT FORTH PLANNING DEPARTMENT' ,106 P 16 Community Development Division r:=; . 0 120 Main Street ab* North Andover Massachusetts, 01845 " 4 6?a eaaRna`'4 ��SSACHUs NOTICE OF DECISION Watershed Special Permit Any appeal shall be fded within (20) days after the date of filing this notice in the office of the Town Clerk, Date: January 06,2026 Date of Hearings: December 2, 2025 January 06,2026 Date of Decision: January 06,2026 Petition oh Steve Boyko,243 Great pond Road,North Andover,MA 01845 Premises Affected: 243 Great Pond Road,North Andover,Massachusetts,01845. Assessor's Map 37.C,Parcel 54 and located in the Residential I Zoning District. Referring to the above petition for a Watershed Special Permit from the requirements of the North Andover Zoning Bylaw,Article 4 Part 5 Watershed Protection District and Article 10 Administration,Section 195-10.7. So as to allow the removal of an existing sports court and construction of a 24' x 36'greenhouse within the Non- Discharge buffer zone of the Watershed Protection laistriet. The project is located within.the Residential 1 Zonin4 District. After a public hearing given on the above date, and upon a motion by S. Kevlahan and 2°1 by J. Simons to APPROVE the Watershed Special Permit,as amended,and based upon the following conditions.Vote was 5-0 in favor of the application. r' Jean Enright On Beh f of the North Andover Planning Board Eitan Goldberg, John Simons Peter Boynton Sean Kevlahan Kate Kelly 'This tocertfTjr that iwwfy(24)days have elap,sed tsarn Dote of 00sion without flog of eri appeat pate o�1, Carla oawne rren Town Ckirk Bk 18537 Pg241 #4276 243 Great Pond Road Map 37.B Lot 54 Watershed Special Pennit—Removal of sports court&construction of greenhouse January 06,2026 The public hearing on the above referenced application was opened on December 2, 2025 and closed by the North Andover Planning Board on January 06,2026, On January 06, 2026, upon a motion made by S. Kevlahan and seconded by J. Simons to GRANT a Watershed Special Permit for the removal of an existing sports court and construction of a 24' x 36'greenhouse within the Non-Discharge buffer zone of the Watershed Protection District under the requirements of Article 4 Part 5 Section and Article 10, Section 195-10.7 of the North Andover Zoning Bylaw. The project is located within the Residential 1 Zoning District.This Special Permit was requested by Steve Boyko, 243 Great fond Road,North Andover,MA 01845 on October 30, 2025. The Applicant submitted a complete application, which was noticed and reviewed in accordance Town of North Andover Zoning Bylaw and MGL Chapter 40A, Section 9. The motion to approve was subject to the FINDINGS OF FACTS and SPECIAL CONDITIONS set forth in this decision. The Planning Board vote was 5—0, in favor. A special permit issued by the special permit granting authority requires a vote of at least four members of a five-member board. The Applicant is hereby notified that should the Applicant disagree with this decision,the Applicant has the right,under MGL Chapter 40A, Section 17,to appeal to this decision within twenty days after the date this decision has been filed with the Town Clerk. The Planning Board makes the finding that the intent of the Bylaw, as well as its specific criteria are met. This decision specifically stated by the Planning Board makes the following FINDINGS OF FACT: 1) That as a result of the proposed construction in conjunction with other uses nearby,there will not be any significant degradation of the quality or quantity of water in or entering Lake Cochichewick. The Project is located within an extremely environmental sensitive area and in close proximity to an onsite wetland resource area located on the eastern border of the Site.The final design reflects discussions between the Town and Applicant to ensure the continued protection of Lake Cochichewick and the safety and welfare of the residents of North Andover. a) The construction has been reviewed by Town Staff and the Town's consulting engineer, Horsley Witten,and with the application of the erosion control measures and a proposed drip edge stone trench to manage the roof runoff from the proposed greenhouse as the stormwater management design,the consultant concluded that there will not be significant degradation to the quality or quantity of water in or entering Lake Cochichewick.The Site drainage system and storm water management design are designed in accordance with the Town Bylaw requirements and Best Engineering and Management Practices.The plan has been reviewed by the outside consulting engineer,Janet Carter Bernardo,P.E.,as evidenced by letters dated November 4,2025,December 12,2025,and December 22, 2025 and response letter from Patriot Engineering dated November 24, 2025 and December 19, 2025. Further, adequate safeguards have been provided to mitigate pollutants from entering Lake Cochichewick through the installation/implementation of the following Best Management Practices relative to construction of the greenhouse: i) The stormwater management for the proposed improvements include a stone drip edge, 2' wide x 2' deep,to capture and infiltrate the roof runoff from the proposed greenhouse.The proposed stone trench drip edge has been sized to capture the stormwater runoff for the 1- year,2-year,and I0-year design storms and have a small overflow discharge in the 100-year storm. The HydroCad analysis results show that with proposed mitigation, the site improvements will not result in an increase in peak rate of stormwater surface runoff for the 1,2, 10 and 100-year design storm. 2 Bk 18537 Pg242 #4276 243 Great Pond Road Map 37.8 Lot 54 Watershed Special Permit—Removal of sports court&construction of greenhouse January 06,2026 ii) Best Management Practices (BMPs) will be followed with regard to maintenance of stormwater design measures, as stated in the document titled "Stormwater Analysis and Calculations for 243 Great Pond Road", prepared by Patriot Engineering, PO Box 362, Lexington, Ma. 02420, dated October 29, 2025 and revised to December 19, 2025. These BMPs include debris and litter removal and stone drip edge inspections and stone replacement. This document referenced herein will be considered part of this Notice of Decision. iii) This project proposes very limited grading. Existing drainage watercourses will continue to function as in the undeveloped Site. iv) Siltation controls are proposed at the limit of work during construction and until the Site is stabilized by landscaped means to protect the lake and surrounding properties for any potential runoff impacts. v) The existing imperious area of the Site is 9,473 +/- square feet (sf). The total impervious area to be removed is 1,801 +/- sf, and the total proposed impervious area to be constructed is 1,243 +/-sf. A total reduction of 558+/- sf of impervious surface area is proposed within the 2,47-acre parcel. The total land disturbance is approximately 26,000 sf, vi) Most of the project area is within the 200-foot Riverfront Area of an unnamed perennial stream. vii) No pesticides,fungicides,chemicals,or non-organic fertilizers shall be used in lawn care or maintenance.This restriction will be noted on the deed. b) The application was reviewed by Town staff as evidenced by email communication from Amy Maxner,Conservation Administrator,dated November 6,2025,NAPD dated October 31,2025,and Tim Willett,Water/Sewer Manager,dated November 4,2025. c) The existing structure is connected to the Town sewer and water systems. d) Any fertilizer spill within the greenhouse will be conveyed via a French drain to the dwelling's infrastructure and to the Town's sewer system. e) The applicant has filed a Notice of Intent with the Conservation Commission. f) No trees are proposed to be removed. 2) 'More is no reasonable alternative location outside the General,Non-Disturbance,and the Non-Discharge Zones for any discharge,structure or activity. 3) In addition,in accordance with Section 195-10.7 of the North Andover Zoning Bylaw,the Planning Board makes the following FINDINGS OF FACT: a) The specific Site is an appropriate location for the proposed use as all feasible storm water and erosion controls have been placed on the Site; b) The use will not adversely affect the neighborhood as the lot is located in a Residential I Zoning District; c) There will be no nuisance or serious hazard to vehicles or pedestrians; d) Adequate and appropriate facilities are provided for the proper operation of the proposed use; 3 Bk 18537 Pg243 #4276 243 Great Pond Road Map 37.8 Lot 54 Watershed Special Permit—Removal of sports court&construction of greenhouse January 06,2026 e) The Planning Board also makes a specific finding that the use is in harmony with the general purpose and intent of the North Andover Zoning Bylaw. Upon reaching the above findings,the Planning Board approves this Special Permit based upon the following SPECIAL COND17HONS: 4) Permit Definitions: a) The"Locus"refers to the 2.47 acre parcel of land as shown on Assessors Map 37.C,Parcel 54, and also known as 243 Great Pond Road,North Andover,Massachusetts. b) The"Plans"refer to the Plans prepared by Patriot Engineering,P.O.Box 362,Lexington, MA 02420,entitled"243 Great Pond Road,Assessors Map 37 Lot 54,Greenhouse Site Plan,located in North Andover,MA", dated October 29,2025 and revised to December 19,2025. Sheets C-1, Ex-1,C-2 through C-5. c) The"Project"or"243 Great Pond Road"refers to the removal of an existing sports court and construction of a 24'x 36' greenhouse within the 325'Non-Discharge Zone of the Watershed Protection District. d) The"Applicant"refers to Steve Boyko,the Applicant for the Watershed Special Permit. e) The"Project Owner"refers to the person or entity holding the fee interest to the title to the Locus from time to time,which can include but is not limited to the Applicant,developer,and owner 5) In advance of implementation,the Planning Director shall review any deviation proposed to the Plans or the conditions of this Decision.Insubstantial deviations may be approved by the Planning Director. Any deviation deemed substantial by the Planning Director will require a public hearing and modification of this Decision by the Planning Board in advance of implementation. 6) In no instance shall the Applicant's proposed construction be allowed to further impact the Site than as proposed on the Plan referenced in Special Condition#1. 7) Prior to the start of construction or the issuance of a building permit: a) A performance guarantee bond of four thousand dollars($4,000.00)made out to the Town of North Andover must be posted to ensure that the construction,erosion control,measures,and performance of any other condition contained herein will take place in accordance with the plans and the conditions of this decision and to ensure that the as-built plans will be submitted. b) Two(2)copies of the recorded decision with Plans attached must be delivered to the Planning Department. c) In consultation with the Planning Director, the Applicant shall designate an independent environmental monitor. The monitor shall read, sign, and return to the Town Planner the Letter of Agreement for Independent Monitors. Upon the start of Site work the monitor shall make bi- weekly inspections of the Project(any suspension in monitoring due to inactivity on the Site shall be pre-approved by the Planning Director), provide monthly reports to the Planning Department, and detail any areas of non-compliance and corrective actions, The monitor will also provide reports following heavy rain events.The monitor must also be available upon notice to inspect the Site accompanying a Planning Department designated official. d) Applicant shall sign the "Stormwater Analysis and Calculations for 243 Great Pond Road" document dated December 19,2025. e) The Applicant shall incorporate the following conditions as a deed restriction and a copy of the recorded deed restriction shall be submitted to the Town Planner and included in the file. 4 Bk 18537 Pg244 #4276 243 Great Pond Road Map 37.B Lot 54 Watershed Special Permit—Removal of sports court&construction of greenhouse January 06,2026 i. Fertilizers are limited to those which are either organic or slow-release nitrogen and phosphorous-free. ii. The use of coal tar-based pavement sealants is prohibited. The Applicant will provide copies of all Decisions,Notification and Orders of Conditions from the North Andover Conservation Commission g) All erosion control measures as shown on the plan must be in place and reviewed by the Town Planner. h) A pre-construction meeting must be held with the developer, their construction employees, and Planning Department (and other applicable departments) to discuss scheduling of inspections to be conducted on the Project and the construction schedule. 8) Prior to release of the Performance Bond: a) The Applicant shall submit an as-built plan stamped by a Registered Professional Engineer in Massachusetts that shows all construction, including storm water mitigation trenches and other pertinent Site features. This as-built plan shall be submitted to the Town Planner for approval and must be provided in paper form as well as in SDF (Standard Digital File) format. The Applicant must also submit a letter from the architect and engineer of the Project stating that the building, landscaping, lighting and Site layout substantially comply with the plans referenced at the end of this decision as endorsed by the Planning Board.This as-built plan shall be submitted to the Town Planner for approval. b) The Planning Board must by a majority vote make a finding that the Site is in conformance with the approved plan, 9) No open burning shall be done except as is permitted during burning season under the Fire Department regulations. 10)The Contractor shall contact Dig Safe at least 72 hours prior to commencing excavation. 11)The provisions of this conditional approval shall apply to and be binding upon the Applicant,it's employees and all successors and assigns in interest or control. 12) This Special Permit approval shall be deemed to have lapsed January 06,2028(two years from the date of issuance)exclusive of the time required to pursue or await determination of any appeals,unless substantial use or construction has commenced within said two-year period. Substantial use or construction will be determined by a majority vote of the Planning Board. 13) This decision must be filed with the North Essex Registry of Deeds. The following information is included as part of this decision: Plan titled: "243 Great Pond Road,Assessors Map 37 Lot 54,Greenhouse Site Plan, located in North Andover, MA" Prepared for: Steve Boyko 243 Great Pond Road North Andover,MA 01845 Prepared by: Patriot Engineering P.O.Box 362 Lexington,MA 02420 Scale: lit=30' 5 Bk 18537 Pg245 #4276 243 Great Pond Road Map 37.B Lot 54 Watershed Special Permit—Removal of sports court&construction of greenhouse January 06,2026 Date: October 29,2025,Revised to December 19,2025 Sheets: C-1,Ex-1,C-2 through C-5 Report Title: "Stormwater Analysis and Calculations for 243 Great Pond Road" Prepared for: Steve Boyko Prepared by: Patriot Engineering Date: October 29,2025,Revised to December 19,2025 cc: Applicant Engineer File NoTm243 GREAT POND ROAD � a ASSESSORS MAP 37 LOT 54 GREENHOUSE SITE PLAN LOCATED IN NORTH A N D OV E R pREa,�Dr., PATRIOT Engineering OCTOBER 29, 2025 T '� REVISED NOVEMBER 21, 2025, DECEMBER 19, 2025 . A SHUT MEX cr �, mx.cooiamoo- 4,.G90Q3-0000. / J l fJAI D.I COVERS"m A4gIoa0Ca EX-1 EASTM CONMON3 ' C,2 0ONSTRIJ071ONMANAMAEWPLAN D]7t•OOSIi000A PO'l.IiOT. C3 SITEKAN �p4 031.c 0c OSTA" ovt.00ts000aa 0-5 DRAINAOEAREAMAP xcams °�'0 mt co 0)AC-0016-0ODD.9 ` \ ~""" UlT:GdOSi alx 7QU-0O�Dd V r fJ L 1 W � 077.000]34000A LOCUS CONTEXT MAP N aA N J rNo�y..t yKc-zsootre-nww+w..+.sa-Paw w,.nWws ar u/aya 4Asm A." ago x 75 Jill I �•�two ``�'ti�q `b� •�\� � + / -/ �a�----�`"�A��� '� V ~ 4 r n r r r a y O t ,- ,--------»-------� \ , tI It t+ Fi`t ? +l+ l�'1 t i � e+ (itt�l%ttjjjjiJj I ti�.�\ °l`'w.,4 +, •,. •—•..,,ti, .. — —y �. � yip � Mi. ;. It It 10 Ak Y' ASSESSORS PARCEL 10: ` ry1V z 037.C-0064.0000.0 oil z G) +"•�" 243 GREAT POND ROAD is NORTH ANDOVER,MASSACHUSETTS 9LZV# LVZba LE98T xg Ea �� ! s ,�. J� � � 2Q � I A I � ,,• x ! / A x� ♦r• r r r � r rrr . rr r• r r r a CONSTRUCTION MANAGEMENT PLAN243 GREAT POND ROAD e, WAMIN PATRIOT Engineering u 1. do NORTHANDOVER,MA NORTH ANDOVER,MA "swam n•aaas wN No 10340M KWACKOUM W420 A, N IaMGAWFft TW4pmxm CI MWN 6Yr b1VC OAYES]p•24.7AX5 $TEPHEN90YKfl O(EpUStMM PMCr No,N0213 9LZ:�# 8tZba LE98T xg a FaT 7 �� 8�� 9 � ` 1'- ��•."'Y "`7�L 'Y 9 Va � ��� R gg$FFR 91 �a � P� y E .�'.��,�a':���n��rr,.' ..�;�r.i.••�'.••" ♦ t �y "^-.., q �� "� P �}�� � a ,+ :�•w,�•�,•�"'•�����`r '•»}: � �t� 1. w r r r r r r • t't,,,a �= BBB � • / C1 ANDOVQR,MA bji- YN pt 01 aounroar t & pA�, � ,Engineering ��stwas,wr . .............. 243C3REAT POND RpAO C NO TH ANDOVER MA roaaxw +ytw562p+ °Rf�lM T3 r lrt NpRTN aawr+ar,rmc DAM 09•80.2025 STEPHEN60YKO ' cmemetwx miccrr RO-ua 9LZV# 6VZba LE98T xg j3 c 0 14 m m 0 t�; 6 I " C 0 ,n Il fil p 0 to1.i T-' 4 Sp3ay till Z � i CONSTRUCTION MANAGEMENT PLAPI yn Stamm 243 GREAT POND ROAD PATRIOT Evngineeringtt., a NORTH ANDOVER,MA NORTH ANDOVER.MA roeaocwx �* 1674101bN N4i3AGi.MlTT60Stl0 M "WAW dNm OMWN$Yt MVC DAM 03.30.2025 STEPNEN BOYKO IMMUOT.MN I PR094CTNo:H0.m3 9LZV# OSZba LE98T xg Bk 18537 Pg251 #4276 STORMWATER ANALYSIS AND CACLUATIONS FOR 243 GREAT POND ROAD IN NORTH ANDOVER, MASSACHUSETTS PREPARED BY: PAT R I OT l�i� Engineering PO BOX 362 Lexington, Massachusetts 02420 DATE: October 29, 2025 Revised November 21 , 2025 Revised December 19, 2025 Bk 18537 Po252 #4276 PATRIOT ��0NNN � ��� ��~`� �� Engineering � ^ ° ������������ �—�—� U�UU'��omu��wmmuum�� PO BOX 382 Lexington,MAO242O VIA:Hand Delivery October 29202S Revised November 21,2U25 Ms.Jean Enright / Director of Planning-North Andover 1Z0 Main Street North Andover,O1D45 Re: 243 Great Pond Road North Andover,Massachusetts Dear Members uf the Planning Board: Patriot Engineering LLC(Patriot) is pleased to submit this letter with accompanying documentation in support of the Watershed Special Permit application for the project located at 243 Great Pond Road.The proposed site improvements will Involve the removal Ofan existing sports court area and gravel edge support ofaproposed greenhouse structure.This project will not be any significant degradation of the quality or quantity of water In or entering Lake Cochichewick,The proposed greenhouse project will not result in any overcrowding or increase in traffic, Is an appropriate use of the existing property and does not cause any hazards from fire or other dangers. This project does not Increase the leviable area of the structure therefore overcrowding Is not an Issue. The existing topography for the subject parcel results in water runoff toward the west portion of the site (toward the delineated wet|and);this location has been chosen as the design point for the utormvvoter analysis.The proposed site improvements will m1mic existing drainage patterns,To mitigate any Increase In stormwater runoff,the entire roof area of the proposed greenhouse will be captured and directed to proposed stone trench drip edge.The stormwater runoff from the remainder of the disturbed areas will mimic existing conditions. The proposed stone trench drip edge has been sized to capture the stOrmwater runoff for the 1-year, 2-year,and 10-year design storms and have a small overflow discharge in the 100-yeaar storm,The HydroCAD analysis results summarized below show that with proposed mitlgation,the site improvements will not result In an increase in peak rate of stormwater surface runoff for the 1, 2, 10 and 100-year design storm. Existing (Pre) --Proeos d(Post) � Accompanying this letter Is: � * A"Gnsenhuuam5ite Plan"dated October 39' 2025. Revised November 21'2O2S ° ^Sbonnwmter Analysis and Calculations for dated October 29.2026'Revised November 21,2025 ° /\n^Opmrat|on&Maintenance Program"dated October 29. 2025. Revised November 21.2O25 Bk 18537 Pg253 #4276 PATRi4T Engineering PO BOX 362 Lexington,MA 02420 We anticipate this information meets the requirements of the Town of North Andover.Should you have anything further detail, please feel welcome to request via email at mnovak@patriot-end corn PATRIOT Engineering LLC, Bk 18537 Pg254 #4276 PATRIOT'E1� Engineering PO BOX 362 Lexington, MA 02420 Michael J Novak, P.E. Bk 18537 Pg255 #4276 ti- y � r is EX STING r r ' ,. 7,117 Fr•, WETLAND u Routing Diagram for 243 GREAT POND ROAD xSub�f React] on�„ �t1k` Prepared by Patriot Engineering, Printed 11/21/2025 HydroGADO 10.20-5c sln 11676 0 2023 HydroCAD Software Solutions LLC I I I Bk 18537 Pg256 #4276 243 GREAT POND ROAD Prepared by Patriot Engineering Printed 11/21/2025 H droCAD•10.20-Sc s/n 11576 0 2023 H droCAD Software Solutions LLC Page 2 Rainfall Events Usting Event# Event Storm Type Curve Mode Duration B/B Depth AMC Name (hours) (Inches) 1 1-Yr 24 Hr Type III 24-hr Default 24.00 1 2.64 2 2 2-Yr 24 Hr Type III 24-hr Default 24.00 1 3.20 2 3 10-Yr 24 Hr Type III 24-hr Default 24.00 1 4.80 2 4 100-Yr 24 Hr Type III 24-hr Default 24.00 1 8.80 2 Bk 18537 Pg257 #4276 243 GREAT POND ROAD Type H/24-hr 1-Yr 24 Hr Rainfall=2.64" Prepared by Patriot Engineering Printed 11/21/2025 H droCAD9'10.20-5c s/n 11576 ®2023 H droCAD Software 5olutlons LLC page 3, Summary for Subcatchment SC-1:EXISTING Runoff — 0.22 cfs @ 12.11 hrs, Volume= 935 cf, Depth= 0.45" Routed to Reach DP-1:WETLAND Runoff by SCS TR-20 method,UH=SCS,Weighted-CN,Time Span=0.00-30.00 hrs,dt=0.03 hrs Type III 24-hr 1-Yr 24 Hr Rainfall=2.64" Area(sf) CM Description__ _ 4,340 98 Court,Roof,and Patio 229 96 Gravel surface,HSG B 20,339 61 >75%Grass cover,Good,HSG B 24,908 68 Weighted Average 20,568 82.58%Pervious Area 4,340 17.42%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment SC-1:EXISTING Hydrograph -1__I-..}...1»-I-_1--}- -_I-_F-{_i»«I«_r_{_-1»_1-_t-+»•-'•- p,� - I I --- i -- - I I - I L. ------1 +1 -JJ,_ I 1 -' 0.24 1 I I I i I I 1 1 1 I I , I 0. 4 4- J - p,Runoff 0.22 --Pi _rI _ --1, LJ.I,-_1JI_«__1I, I I I 1 1 i I JQ.21 _ I I I t i I / 1 I I I I 1 t I 1 I I I I S I I 0.2 '^T^�^-r^r» 1- I^^w-r^T^ 1-_ -T-_r- �/�+�- 7- rr- ry/fir �/� Q.19 -1-,--i^-L_1_J_-I-_ti l^-J-_L J--I_T--Y- 'r2''� � ^Li 'T _'V_ P 1 1 I I I t I 1 - 0.16y1-{Iy�--rye //�• t--/�y}-�/-► {�__I_ 0.17. I i t I I I I I I i 12ar�Of`l RI W�l-'f�4-V VY 1� -0.16 `�-� 1 _�_}__I__w_� _ ,- }__ 1__I__► _J _ 1 w �_a l__� _1--w +- I i i I I I I I I 1 i I I 1 I 1 i I I 1 I r 1 0.16 -T- --r^r_T_---r-r- I-�--r r--I--r- r �+ 0.14 _J._J__i__L,-.J_J_J__L_J__I__l .J...-1.._L_ �u�a fit'0-um' 'eF'-0�� '-- 47 .. 0.13- r *- '= 0.12 •- _ _ i I 1 I I I I I , I I 1 I I];W -Q�/F111/�F� V" « �4yt'{��,�/j�■.( I 0.110.1 -}- �- ,« r-•1-1--I--r-�-�--r +--t--r-*-1--r_+ -t- --I--r-*-1 r -*-{--I-- 0. tIL._-4JI- _-__III___I I t t. - 0.08 1 - r-T r T-.1 L-4-JC _ Q.07 1_JI / i I I 1 I I I 1 1 1 t 0.06 / -t^^I-^I-^r-n--1__r_t-� -t-^ ti--I--r-r--t--1--� T--I--I--r-Y- , r-� I_- 0.05 -_I-_L j_ ' I_ I I I 1 I I I 1_ I_ I �_f _ 1__L_1 «I -1--1_"I �-I-TI�'�'I -I"_I_^�-I 0.04 ^+--i.-_y....t._+....1_..I..../.-.1^-i-•..I ..,....}...J__.I-...»t-..+,.-I,._I-..F +.....I--b'..4«.+--I.._ 0.03 0.02 J _i _I- w J _I -1 _3 _J_.A__ J _J__I--I.-A_4 _I_-t._.l_ 0.01 0 1 2 3 4 5 6 7 6 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 i Time (hours) Bk 18537 Pg258 #4276 243 GREAT POND ROAD Type/H 24-hr 1-Yr 24 Nr Rainfall=2.64" Prepared by Patriot Engineering Printed 11/21/2025 HydroCAD"10.20-5c s/n 11576 V 2023 HydroCAD Software Solutions LLC Page 4 Summary for Reach DP-1:WETLAND Inflow Area= 24,908 sf, 17.42%Impervious, Inflow Depth= 0.45" for 1-Yr 24 Hr event Inflow = 0.22 cfs @ 12.11 hrs, Volume= 935 cf Outflow = 0.22 cfs @ 12.11 hrs, Volume= 935 cf, Atten=0%, Lag=0.0 min Routing by Stor-Ind+Trans method,Time Span=0.00-30.00 hrs,dt=0,03 hrs Reach DP-1:WETLAND Hydrograph , -r'r--1--I--r-r-•r--I--I--i--r-r- 1-ti--I--r-r-Y-y_-I_-,_-r_.r_y_-t--t-^>-"t»t_ ,' _1_1_J--I»..l.-L»d_J« ^-i !-•i_1_J__I__L_L_2_J_�--I--L-�-'J_J-_I--t_2_1_ MInflow ®Outflow 0.24 � -+-+-i--1--I--1'-+-�--1-- 0.220b -I-1--I--w-w-+--s--I--I--w_+•-a-'a-_+"«,_"+'.r« ♦ i i I I I I I I t i 1 1ii�_i�f� I 1+iI I _1 �` Imo+ _ 0.23 �,J �yII IL1 �'7�� 0.22 ♦'-r-+- 1--1--r-r- -1--1--i- - 1- 1- i 1 s- 0.21 0.2 •_t •4--1--1_ 0.1 . r I_ _4--1- - I I I 1 I I I I 1 I I I I I 1 I I I f I I I I i . ....... 0.16 ..^►_+--I--1--I--1--+--1--I--i- -a--1--I-_w_w-'+-.+--1__,""w-+--+-�--I__w_+_+_. ♦ i l_ _ 1 !_ _ I i I I I I I i 1 I I !_ " I I I i I I 0.1 O0.14 ',,♦.. -ii ' i( 1S II"_1I �II 1I I_..I.._ii 4�1-_._I__-.II_-_II---II-. 0.1 �.TiI __.. 0' -+-+--1--r--1-_r--+-4--I-_1 ..1--I--,--~-I-_4--4-_I-••h_1.-{.«J«-1--•I--i--�-•�-_ � ♦ ♦' 011• y_ - i �- ,--�-r T 1r-T-T- ' '.0.1 +..+- 1--+-4--1--1 A--1--1--r•-w-4__1--I.-...1.....1--a-.J«I-_.I--w- 1 0.09T- --r-r-r-T- --I--r-r-r- -`1--r-r"r-s- 0.0$ ♦',•-4-4-4--I-_1._4-1-4--1--(_ 4--1-_I__t_-L-1 J..-I-._I--L_1-J_4--1--(--1-1- 0.07 I I 1 I I I I I 1- Ir Ir- i--,1--I -Ir-TI I I I i , fT 0.06 +-4-4--I-- I"- -4--1--1 4--I--L1.-4-4--1--I--.-4-4-4--1-- 4--T41 .- I 1 I I I 0.06 -T-;_-� -,_"r_r- 1 r-r-T-�--,-- -r-T-�-i -I^^r-T-T- 0.04 / ' 1_1_J-_I--L«L-1_J_J__I L.-L_1_J--I-_I-..L_1-J-J__I_»F,..1..1... 0.03 '' _i 1 I I I 1 I I i i i I -I I I I /, , ..T_.�_1__h,.I,_r_T_�_-1__i. _ -n"n--1--r-T-T' 0.02 0.01 0 0 1 2 3 4 5 8 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) Bk 18537 Pg259 #4276 243 GREAT POND ROAD Type H/24-hr 2-Yr 24 Hr Ralnfall=3.20" Prepared by Patriot Engineering Printed 11/21/2025 HydroCAD610.20-5c s/n 11576 ®2023 HydroCAD Software Solutions LLC Page 5 Summary for Subcatchment SC-1: EXISTING Runoff = 0.42 cfs @ 12.10 hrs, Volume= 1,521 cf, Depth= 0.73" Routed to Reach DP-1:WETLAND Runoff by SCS TR-20 method,UH=SCS,Weighted-CN,Time Span=0.00-30.00 hrs,dt=0.03 hrs Type III 24-hr 2-Yr 24 Hr Rainfall=3.20" Area(sf) CN Description * 4,340 98 Court,Roof,and Patio 229 96 Gravel surface,HSG B 20,339 61 >75%Grass cover,Good,HSG B 24,908 68 Weighted Average 20,568 82.58%Pervious Area 4,340 17.42%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) {ft/ft} (A/sec) (cfs) 6.0 Direct Entry, Subcatchment SC-1: EXISTING Hydrograph - -I-- - - I Pr i = I �7 - - - - --1-- �q 0.46 ' -L- --i__L_.l-J__I__L_J__I__L_L_1__I__L -L--1-«1 I- 1_41__I_-L _L_L_L_r__ �RUnO11 I i i I I I I I I 1 I I I I I I I I I 1 I I I I I 1 ( 1 1 0.44 ' -r--1--i--r-1--I--I--r-'I--i'0.42 dt •'--I--Y-r-","_1_"r"?"`1.. 0.42 ' 1 I ' I1 I ) -111 0.4 yp-Q- 1 1 1 I 1 �1 0.38 -t---- I r 1[: v2,T ir anII »0.36 P- /IR -M A. -__- 0.34lilI r r r I I 21_4J,_.9..I.,0-L8..-.l,'S.._fI_- _ 0.32 � i � j � - 'I--1I_ ■��bn�{V'��I �r Y./rTTA/��1II I I i II �II II I,ryy�i,J/■-- II R- / I 0.3 I _ I,. t_ I- T. .�I«_L-" �" Vu_l_i_r - V�rr 0.28 1--I--I-.1--4--I--L- 1-`-- 0.26 y--I--r-r-ti- r- r---"r-r-r- r-r-r--1-- yLL 0.24 1I-!II l -�III - a_ II I1 i II �YIII!M0.22 0.2 4- - -1- r-r- I- _ r 0.18. i 1 -1- --1--L-71 I I I I - I-II r�III�rII).-OIII _'tMi,i ItI nL�rlI - 0.16 I'1-;-A'I--1--4.-4_ 4-- 4' -1--j-- F-i-4- - - 0.14 rI - ....... Ir-r- r 410!II F --v - --' 0.12 I 0.1 /r r I I I I 1 r I I I I 4I I -iI.-1i - tI . 0.08 -r ` --i-- "II -0.06 0/� .04 _k-y--i_._M_.{._y__I_-F_.4_y-..� F- i ✓, ...ti +.--r««.I......W-.j_y--h_F«,-L...-1-- / '� f 0.02 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 16 16 17 18 19 20 21 22 23 24 28 28 27 28 29 30 Time (hours) Bk 18537 Pg260 #4276 243 GREAT POND ROAD Type 11124-hr 2-Yr 24 Hr RafnfaA=3.20" Prepared by Patriot Engineering Printed 11/21/2025 H droCADo 10.20-5c s/n 11576 ©2023 H droCAD Software Solutions LLC Page 6 Summary for Reach DP-1:WETLAND Inflow Area= 24,908 sf, 17.42%Impervious, Inflow Depth= 0.73" for 2-Yr 24 Hr event Inflow — 0.42 cfs @ 12.10 hrs, Volume= 1,521 cf Outflow = 0.42 cfs @ 12.10 hrs, Volume= 1,521 cf, Atten=0%, Lag=0.0 min Routing by Star-Ind+Trans method,Time Span=0.00-30.00 hrs,dt=0.03 hrs Reach DP-1:WETLAND Hydrograph r-T-j--I--�-�-T--1 j--j-I--r-T-l--,--j ' _L_S...1-- MInflow 0.46 OA21h _,II I- Outflow L_1_JOA4 0.4206 _ 9 OA2 hiflow. rf 0.4 0.3$ r'r' I 0.36 / / -T'"1_-I--1-"f—1'-T-'I"I-^i' .'.t'"1__I__r_f_T_.i_..L._�-f"'T_'1^.t....l_..r-7 T^ ' ' - -1-J..-1-_L-L-1_-I_J_-i,- 0.34 L i 1 { 0.32 0.3 I I -1 1 � 0.28. -1-_1-.1-_I--I-t.-+- l _I__i _ 1--I_ I _h I -1 i- 1-^I-^1-1_ 1 .-1«_I h 4 --1-- y I i I I I I I I I i I I I I I I i I I I I I I 1 i i I 0.26 r-T- --r-r -r-T- ... 0.24 /',' Q0,22 r/ -r-T-ti--r-r^r-r-�--r-i 1--t--^I-«r-r-T-�--I-'I-'r-T-I--I_-I--r-t-z- N 0.2 r - - - - ^-L-`-1-J--'--'- 1-J--I__L-I--1--1- --'--I--1-l-l--'_-L-I-l- r ,r I i I I I I I I I 1 I t I 1 IL 0.18 _ __ _ _ � -I0.16 i 1 I I 0.14 /', -1 -1 .1--1--I--L-1-.I_J__I__4-1_1-- 0.12 I t I I I 1 I I I I I I i I 'T'T--I__I_•.r`r«7'"�'"-I--1 -1--1 -1-r- --I--I- r- -T-7« L_L.-1_J__I_-t _J--I.-_L_L_1_J-_I--t_-L«1-J- L_L_1_- 0.1 I I I I i I I 0.08 r „ -t-t^^I-._I_«.I..«r-'►^-5--1-- -I..-.,...,-....I--t--1-..I....r....,_-1--I--I.. r 0.08, 0.04 0.02 0 1 2 3 4 5 '5 7 8 9 10 11 12 13 14 156 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) Bk 18537 Pg261 #4276 243 GREAT POND ROAD Type 11124-hr 10-Yr 24 Nr Rainfal1 4.80° Prepared by Patriot Engineering Printed 11/21/2025 H droCAD®10,20-5c s n 11576 0 2023 H droCAD Software Solutions LLC Page 7 Summary for Subcatchment SC-1:EXISTING Runoff = 1.12 cis @ 12.10 hrs, Volume= 3,609 cf, Depth= 1.74" Routed to Reach DP-1:WETLAND Runoff by SCS TR-20 method,VH=SCS,Weighted-CN,Time Span=0.00-30.00 hrs,dt=0.03 hrs Type III 24-hr 10-Yr 24 Hr Rainfall=4.801I Area(sf) CN Description * 4,340 98 Court,Roof,and Patlo 229 96 Gravel surface,HSG B 20,339 61 >75%Grass cover,Good,HSG B 24,908 68 Weighted Average 20,568 82.58%Pervious Area 4,340 17.42%Impervious Area Tc Length Slope Velocity Capacity Description (min) _ (feet) (ft/ft) (ft/sec) (cfs) 6,0 Direct Entry, Subcatchment SC-1: EXISTING Hydrograph I I i I I I I I , 1 I I I I I I 1 I i I I I I I I I i 1 I �Runoff I I I I I I I I I 1 I I I I I I I I I I I I I ///���i i I I P0 111 II 2i4-h r I I i I I I I I 1 I i I I I I 1 I i I I I I I i ^T--I--r-r-'I--r-r-r-n"'_f-T ^_r'r-'f--r-r-r-'t--r-r-4- r"r"'1^_i""r-T"_ I I I I I 1 I i 1 i I I I I i 10;-Yr24Hel13aInfa-11:41.801 I I i I I I I I I I i I I I I I i I �e a�2I ,VVi R ii 7y Ron' o nI ff. V. 0 10 r eI, ,PQgi cfo i I I i I I I I I I I i 1 I I I I I i I I I I I I i 1 I /'�7�'+�T+I i 1 Irr IR666 ■1 bent —4 74`I T0I I61I011*i i. 0 I I I I i I 1 I I I 1 I I I I I I f I I I I I I I I i I /., I I i I I I I I I I i' �: r I I I I 1 I I I I I I I i i I I I i I I I I I I I i ¢ "' I I t I I I I I I I i I I lY 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) Bk 18537 Pg262 #4276 243 GREAT POND ROAD Type I//24-hr 20-Yr 24 Hr Ralnfall-4.80" Prepared by Patriot Engineering Printed 11/21/2025 H droCAD®10.20-5c s n 11576 (D 2023 H droCAD Software Solutions LLC Page 8 Summary for Reach DP-1:WETLAND Inflow Area= 24,908 sf, 17.42%Impervious, Inflow Depth= 1.74" for 10-Yr 24 Hr event Inflow = 1.12 cfs @ 22.10 hrs, Volume= 3,609 cf Outflow 1.12 cfs @ 12.10 hrs, Volume= 3,609 cf, Atten=0%, Lag=0.0 min Routing by Star-Ind+Trans method,Time Span=0.00-30.00 hrs,dt=0.03 hrs Reach DP-1:WETLAND Hydrograph 0 Inflow ®Ouhlow t i I I I I I , I i 1.12015 I I I I I 1 I 1 I I I I I I t I 1 I i�`i_i? K ��1.L■��'�IC_ _`I�_ _. -1-�-�--I- �-1-�------L --- n r 1 I I I I I I 1 1 i I 1 I I I 1 I i I I I I 1 i I I I I I I 1 I i 1 I 1 / i I I I I I I 1 I I I I I I i i I I I I I 1 I I I I l i I I I I I I 1 I I i I I I I I I t i I I I I t i i I I I I I I I i I I I i I I I I I I 1 I I I I I t i i I I I 1 I 1 I i I I i i I I I I I I i i I I I I I i i I I I I I I I i I I Il. t I I I I I I I I I 1 I I I I i i I I I I I I I 1 I I I i I I I I I I I i I I I I i i I I I I I I I i I I I i I I I 1 I 1 I i /rr I I I 1 I I I i I I 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) Bk 18537 Pg263 #4276 243 GREAT POND ROAD Type I//24-hr 100-Yr 24 Hr Rainfal1=8.80" Prepared by Patriot Engineering Printed 11/21/2025 H droCAD®10.20-5c s/n 11576 ©2023 H droCAD Software Solutions LLC Page 9 Summary for Subcatchment SC-1: EXISTING Runoff = 3.28 cfs @ 12,09 hrs, Volume= 10,203 cf, Depth= 4,92" Routed to Reach DP-1:WETLAND Runoff by SCS TR-20 method,UH=SCS,Weighted-CN,Time Span=0.00-30.00 hrs,dt=0,03 hrs Type III 24-hr 100-Yr 24 Hr Rainfall=8.80" Area(sf) CH Description * 4,340 98 Court, Roof,and Patio 229 96 Gravel surface,HSG B 20,339 61 >75%Grass cover,Good,HSG B 24,908 68 Weighted Average 20,568 82.58%Pervious Area 4,340 17.42%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ftjft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment SC-1: EXISTING l Hydrograph I 1 I I I I I I I i 1 I I I I I I 1 I I I I 1 I I I I I I iD Runoff 1 I �j 1 I I I i I I I I I I I i I I I I I I i I 1 tT Gel Ul_j4,i1 I � ...r._.i....t..-h-�_._I-..,....t...y....l.....} f._.I_.-.I-..q..-I«_'I--•{-•H.--.I...Y..Y.J1 Gt ilk_ 1 3-1 1 1 1 1 1 I I I I I I 1 1 1 1 1 1 1 1 1 ! 1 1 1 1 1 1 1 1 i I I I I I 1 I I i I t 100-Y9 24 :Hr Rgillf911T8.80"I I I 1 I I I I I I I I i I 1 1 I I 1 i I I I I I I I i I I Ru hdff;Area=24,�948;s I1 �II n�II1 fI I 1 1 Lj 1I m'11 e�I _ c _ __ _ -_I__-----------_I- I i lI 2 Fkudfpth 4.92_' � I of 1 1 ( I 1 I I I 1 I ( 1 1 1 I I I t I 1 1 I I 1 1 I T& 6�OIrliilli EI I I 1 1 I 1 1 1 1 1 1 1 1 1 I 1 1 1 1 1 I 1 I 1 ( I I I 1 I I I I I I 1 I i I I I I I I i I I I I I f I 1 I 1 I I I I I 1 I I I I I I I I i 1 I I I I I I i I I I 1 i I I I I I I I I 1 I I I 1 1 I I I I I I 1 i I I I I i I I I I I I 1 I I I I I I 1 I I I I 1 I I i I I S-"Rm 1IIIIIIIIIIIII1IIIIII1iII 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 16 16 17 18 19 20 21 22 23 24 26 28 27 26 29 30 Time (hours) Bk 18537 Pg264 #4276 243 GREAT POND ROAD Type III 24-hr 100-Yr 24 Nr Rainfall=8.80" Prepared by Patriot Engineering Printed 11/21/2025 HydroCAD°10.20-5c s/n 11576 Q 2023 HydroCAD Software Solutions LLC - _ Page 10 Summary for Reach DP-1:WETLAND Inflow Area= 24,908 sf, 17.42%Impervious, inflow Depth= 4.92" for 100-Yr 24 Hr event Inflow = 3.28 cfs @ 12.09 hrs, Volume= 10,203 cf Outflow 3.28 cfs @ 12.09 hrs, Volume= 10,203 cf, Atten=0%, Lag=0.0 min Routing by Stor-Ind+Trans method,Time Span=0.00-30.00 hrs,dt=0.03 hrs Reach DP-1:WETLAND Hydrograph I i I I I I I I I i I I I I I I I i t I I I I I I I I I I I I I I I I I I I i I I I I I I I i i I I I I I I i I I I ®Inflow I i I I I I I I I t I I I I I I i I I I I I I I I I t M outflow I i I I I I I I I i 3,Z8�5 I I I I I i i I I I I I I I i I 1 I i I I I I I I I I I I I i i I I I I i I i I I I I I I I 8.28 Cis I I „ T-'I--r--I -T -I_ r�it'1' lc�w-Area=`3I�4I s';` I �'' 3 1 i I I I I I I I i 1 I I I I t i I I I I I I I Y I I 1 i I I I I I I I i 1 I I I 1 i i I I I I I I I i I I 1 i I I I I I 1 I i 1 I I I I i i I I I I I I I i I I I i I I I I I 1 I i t I 1 I I i i I I I I I I I i I I I i I I I I I 1 I I I I I I I I i I I I I I I I i I I 1 i I I I 1 I I I i I I i I I i i I I I I I I I i I I _r_T_.,_n_..i.._T._T_..I..."r_•'I_'"1•`Y".1.-_i_..,-_,._ 2 I i I I I I I I 1 i I I I 1 I i i I I I I I t I i I I I i I I I I I I I i I 1 I I I i i I 1 I I I I I 1 I I p I i I I I I I I I I I I I I I i I I I I I 1 I I 1 I I W I i I 1 I I I I I i I I I I I i 1 I I t I I I I i I I I t I I I I I I I I I I I I I i I t I i I I I I i I I 1 i I I I I I I I i I I I I i 1 1 f I I I I I 1 I I 1 � _{_y_y__f"^r-•y-y--I--I--f -I--�-+-�_-f--i__F_{_..1__1--I--�-{_1__t_'-f<�F'" I I 1 I I I I I I i 1 I I I 1 1 1 I I 3 I I 1 I 1 I I t 1 I I I I I I i I I 1 I I I I I I I I I I I i I I I I 1 I I 1 I I I I I f I I I i I I 1 I I I I 1 A 1 t I i l I I I I I I I t I 1 I i i I l I I I I 1 I I 1 1 I I I I I 1 I 1 I I I I i I t 1 I I I 1 I 1 I i i I I I 1 I I I i i I I 1 I I I 1 I 3 I i 0 1 2 3 4 5 6 7 a 9 10 11 12 13 14 15 16 17 16 19 20 21 22 2$ 24 25 26 27 26 29 30 Time (hours) Bk 18537 Pg265 #4276 BARN f z r PROPOSE �a STONE TRENCH WETLAND 3` Routing Diagram for 243 GREAT POND ROAD_POST Subc�t� Readi Pon', LInK Prepared by Patriot Engineering, Printed 11/21/2025 HydroCAD010.20.5o sin 11576 0 2023 HydroCAD Software Solutions LLC Bk 18537 Pg266 #4276 243 GREAT POND ROAD POST Prepared by Patriot Engineering Printed 11/21/2025 H droCADO 10.20-5c s/n 11576 0 2023 H droCAD Software Solutions LLC Page 2 Rainfall Events Listing Event# Event Storm Type Curve Mode Duration B/B Depth AMC Name (hours) (inches) 1 1-Yr 24 Hr Type III 24-hr Default 24.00 1 2.64 2 2 2-Yr 24 Hr Type III 24-hr Default 24.00 1 3.20 2 3 10-Yr 24 Hr Type III 24•hr Default 24.00 1 4.80 2 4 100-Yr 24 Hr Type III 24-hr Default 24.00 1 8.80 2 Bk 18537 Pg267 #4276 243 GREAT POND ROAD POST Type/I/24-hr I-Yr 24 Hr Rainfalf=2.64 Prepared by Patriot Engineering Printed 11/21/2025 HydroCADO 10.20-5c s/n 11576 0 2023 HydroCAD Software Solutions LLC Page 3 Summary for Subcatchment 3S:BARN Runoff 0.05 cfs @ 12.08 hrs, Volume- 179 cf, Depth= 2.41" Routed to Pond PT:STONE TRENCH Runoff by SCS TR-20 method,UH=SCS,Weighted-CN,Time Span=0.00-30.00 hrs,dt=0.03 hrs Type III 24-hr I-Yr 24 Hr Ralnfall=2.64" Area(sf) CN Description 890 98 DRIVE 890 100,00%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) _(ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S:BARN Hydrograph T I- r-i- r.i.... ......--------- r 1- -r- 0.055- : 1 0.0 L.-4.--t--4--L- Yr:24 0.046 1:- ' , Hr Roin, 5 4 : T I I I 1 -1 1 1 1 -r--t- -r-i--I--r--r- 0.04- : : Runbff Aedw--890 sf L J -J- L 1-.4 -1- L .11.0.035. Runoff Mplvin:e�-170 0 0.03: KLjb ff pli t Iv. p T a 0.02&� 0jntrj-- 0.02- -1 Ir T I......r i- r I 0.01 0.01 -L-I J L j 0.005-' 0 .................. 0 1 2 3 4 b 8 7 8 9 i 0 11 "12 13 14 1'5 16 17 18 19 20 21 22 23 24 26 26 27 28 29 30 11nw (hours) Bk 18537 Pg268 #4276 I 243 GREAT POND ROAD POST Type/if 24-hr 1-Yr 24 Nr Rainfal1=2.6411 Prepared by Patriot Engineering H droCAD•1o.20-5c s n 11576 ® 4 2023 W droCAD Software Solutions LLG Printed A1/21/202 Page 4 Summary for Subcatchment SC-100: PROPOSED Runoff = 0.16 cis @ 12.12 hrs, Volume= 767 cf, Depth= 0.38" Routed to Reach DP-100:WETLAND Runoff by SCS TR-20 method,UH=SCS,Weighted-CN,Time Span=0.00-30.00 hrs,dt=0.03 hrs Type III 24-hr 1-Yr 24 Hr Rainfall=2.6411 Area(s* CN Description * 3,050 98 Ex.Roof,Ex.Patio,Prop Wall and Landings ' 156 85 Gravel roads,HSG B 20,812 61 >75%Grass cover Good HSG B 24,018 66 Weighted Average 20,968 87.30%Pervious Area 3,050 12.70%Impervious Area Tc Length Slope Velocity Capacity Description (min {feet) (ft/ft) (ft sec) {cis) 6.0 Direct Entry, Subcatchment SC-100: PROPOSED Hydrograph -}__t.._i_^r"t--I--I^-r-1--•I--F-t-1--'__I 1 I I ENRlllff! f 1 I 1 I--'- '--~- -�--I--F-+-y---I--t-•t--I-- 1 1 I I ..1.._1--L_.{--1I 0.16 .t«•_I-_ _L_..I-_I-'i--}_.1«_I--4-1_J__,.._7.-.+--I,.._ 0.1 •- - --5-«i_i_J-_;__i-i- --� ..J__;-_�- �__�__i i_i ����/+±'_���-`/ICI�' .\/I ^ 0.15 '__"rF-_H-"-;^-_-�_i•-i.,_I_..rr _•YlII.-.`yryIII-_.._-ri _..�,rI._.__I,,II_- 0.14 �T `I- r- r^ r^ -_t1�_-�,-,��+•1rI-~T,I7 r'�"VyS,II1,_11 M..,TI�- I 'd...�T111II 1r.Y�i�_� II Z 1 Ti;�i}/V �1 _-1f;0.13 t I I I I .i_ '- 1. 7 T - " 0.12 IRU h, r I F--1-- 0.11 1 r 1 1 1 I i 0.1 I L-1_J_I J __ -_L_J- __I L_1_J1_.. I I I I f I L_ 0.09 i I I 1 I 1 I 7 L_1_J_ I--L-J J_ I �_�_ i_L_i T'"noff O 0.0s ,L _ _____ - Lm- -y-� I 0.07 Tt O- ■ A l -T-�--r-r--1-�--r-r^�--I--r 1--I-`r-r-�--r-r--T-7--1--rT-�--r-r-T--I-- 0.06 0.05 - F--r-�--I--r--t--�-- I-- I 1 �f■-- 0.04 I 1 1 f I I i I I I i f 1 1 1 I I I i I J._J__i.._L..J_J..-•f__4_J„J.... ." _f__(.,._A,,.,J.._I-_4._.l_J I__L_.1-J__L.,L_1 I I i I I I I I I I I I I I I I i i I I I 0.03 0.02 , '-j--�..-i_-r"T"�_-, r_.�,._I dl' I � 1_ 0.01 1 I I I t I I i i--I_ 1 _I_ i _T_ _ 1 r_ _ L I I I i I o , 0 1 2 3 4 5 a 7 8 9 10 11 12 13 14 15 16 17f 18 119 20 21!22 23 24 2S 26 27 28 29 30 Time (hours) Bk 18537 Pg269 #4276 243 GREAT POND ROAD—POST Type Jl!24-hr 1-Yr 24 Nr Rainfall=2.64" Prepared by Patriot Engineering Printed 11/21/2025 H droCAD4'10,20-5c sJn 11576 ©2023 H droCAD Software Solutions LLC Page 5 Summary for Reach DP-100:WETLAND Inflow Area= 24,908 sf, 15,82%Impervious, Inflow Depth= 0.37" for 1-Yr 24 Hr event Inflow - 0.16 cfs @ 12.12 hrs, Volume= 767 cf Outflow = 0.16 cfs @ 12.12 hrs, Volume= 767 cf, Atten=0%, Lag=0.0 min Routing by Stor-Ind+Trans method,Time Span=0.00-30.00 hrs,dt=0.03 hrs Reach DP-100:WETLAND Hydrograph �I 00.,1185 '/l'/����''•'--_»TrY.Lt�I.----..TT1L1i1i---__97JJJ1II--_«»"-___lIrIIIII-..».---._.rIrIlI1-..--._..rIrIIIL..---_Tr1II.--»...�tiJ1I--_-^-_IrrII-_'--tII1I1-..-r-T--..--JtI1I--_'-.JI1II -»-"-«IIIIII--..-•-.rr1I41..-...-rrLIL--._.7.J1Ii1I.•-»»••.JJJiiri-_..,,--__IIIIIII---»---...II1IIII-___.'.._..rkrLI1It..---«_.rrtAlIII.•^».-'-�h-JJ1II'---.•-�-JJ.JIII-.__.--».»./`Mr1yrIIIII�»_1_.---_.(Vi.jriri(jiiL r._"---._,r*111ii"--.«.7*.1.111It --^•._.. ".. OU�(OW 0.11" -t----I--I - 0.17 U.168 0.16 1nf16 ,.Ay a:424,' _L_L»Y-4--- 1- 0.1 J IL 0.13 0.12l»1_J ' � I i I I I I 1 I I I • t I I I I I i I I I I t 0.11 _p � »7_i.-»1 w 0.1 ' I- I . i j--I 0.09 � , ^r--�-�'-i-f^r^T-"I--1--i .�_�••_I__r_r_i-1_-I--�-r-7-i--I--I--f'T^T- O ' 0.08 1 i l I I I I I I ( I I I I I 1 1 I t I I I I I i ( 1 ,' -r-T-�--I--r-r-T--I--1--t ^I«-r-r-T-�1'-1--r-r-T"1--1--i-r«T-T- 0.07 ' I I I 1 I I 1 1 t 1 I I I I I 1 1 l I 11 1 -r'T-9-"1--r-r-T-"1-'I"-l' 1-"1»-1'-r-r-T-l--I'-I--r-'r»l-'1--1--r'7-1- 0,06 '' '� I I I I I I. I I I i I I I 1 1 I 1 1 1 ,' , 'T-Y-I'-I--r-r`T--1-'t-- -1--I-�r-r-T-9--I"-I--r-T-9-`1--I--r-T•'T- 0.05 I I i ' -t'•t--1--I--h_F_t...�_••1--i '-I-^I--I--F"i-'1 I--I_-b...�.-'1"�--I_-•1--+»+-' j »7 0.04 '/•' I I 1 I I I I I I i I I I I I I I I t I I 1 i1-" i 1 Ii »i'-+_-1»_I»..1...1._+--�.._I-_i _..F..l-..A..•i--1.. M�-FF^-I--1- -- i' I i I I I I I I I t •.^ I f i I I I I 1 I I 1 t I f 0.0 3 1, »J_»I-.-I--H-+_-1--t--1_»F_{.-•+- 1 0.02 1 1 t I I 0.01 0 0 1' 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Tlme (hours) I I I I Bk 18537 Pg270 #4276 243 GREAT POND ROAD-POST Type lf124-hr I-Yr24 Hr Ralnfall-.2.64" Prepared by Patriot Engineering Printed 11/21/2025 H droCADe 10.20-5c s/n 11576 ®2023 H droCAD Software Solutions LLC Paize 6 Summary for Pond PT:STONE TRENCH Inflow Area= 890 sf,100.00%Impervious, Inflow Depth= 2.41" for 1-Yr 24 Hr event Inflow = 0.05 cfs @ 12.08 hrs, Volume= 179 cf Outflow = 0.01 cfs @ 11.70 hrs, Volume= 179 cf, Atten=85%, Lag=0.0 min Discarded = 0.01 cfs @ 11.70 hrs, Volume= 179 cf Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf Routed to Reach DP-100:WETLAND Routing by Stor-Ind method,Time Span=0.'00-30.00 hrs,dt=0.03 hrs Peak Eiev=152.91'@ 12.57 hrs Surf.Area=140 sf Storage=51 cf Plug-Flow detention time-39.8 min calculated for 179 cf(100%of Inflow) Center-of-Mass det.time--39.7 min(800A-760.6) Volume Invert Avail.Storage Storage Description #1 152.00' 224 cf Custom Stage Data(Prismatic)Usted below (Recalc) �. 560 cf Overall x 40.0%Voids Elevation Surf.Area 1nc.Store Cum.Store (feet) $Q-ft cubic-feet cubic-feet 152.00 140 0 0 156.00 140 560 560 Device Routin Invert Outlet Devices #1 Discarded 152.00' 2.410 in/hr Exfiltration over Surface area #2 Primary 155,95' 10.0'long x 1.0'breadth Broad-Crested Rectangular Weir Head(feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1,60 1.80 2.00 2.50 3.00 Coef.(English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 Discarded Outflow Max=0.01 cfs @ 11.70 hrs HW=152.04' (Free Discharge) Z-1=Exf ltration (Exfiltration Controls 0.01 cfs) Primary Outflow Max=0.00 cfs @ 0.00 hrs HW=152.00' (Free Discharge) Z-2=Broad-Crested Rectangular Weir (Controls 0.00 cfs) JI 1 I Bk 18537 Pg271 #4276 243 GREAT POND ROAD—POST Type U/24-hr 3-Yr 24 Mr Ra1nfd11=2.64" Prepared by Patriot Engineering Printed 11/21/2025 HydroCAD®10.20-5c sJn 11576 ©2023 HydroCAD Software Solutions LLC Pa>e 7 Pond PT:STONE TRENCH Hydrograph , J_ t--I- ®Inflow ' ,•_i S I I I 1 , 1 i I I 1 I II ■11 s i I I �Q�"�I,(`��!i11�,`�.�I1 -_ ®®QPrLlmCfiaOW I - 1 �- i-_-------5MIN � ' , mo �M0.0b r 9 I-,,'II _0.048 grape=;6 1� 1 1 ,� I I I I l I I I i I I r I I I ■I � -• -J«J_J_J_J_J- 0.0a r. «I «0,03b 1 f 0.03 r O.o2b ' -I"'_L_L_L_L I-._I-.-L./�-.-1-- -I-_I--I--I--,_J_. K I I I I I I I 1 i 1 1 1 : I I I I I I I i l I I f I I i I 1 I I 1 1 I I i I 1 w-'_-1--I--�--t--+"-+_-4_-t_y_y_y_"--r-''_''_ 0.04 da 0.015 0.01 0.00 ct 0 1 2 3 4 b 8 7 8 9 10 11 12 13 14 15 16 17 18 119 20 21 22 23 24 25 26 27 28 29 30 Time (hours) Bk 18537 Pg272 #4276 243 GREAT POND ROAD POST Type III 24-hr 2-Yr 24 Nr R'alnfall=3.20" Prepared by Patriot Engineering Printed 11/21/2025 H droCAD®10.20-Sc s/n 11576 ©2023 H droCAD Software Solutions LLC Page 8 Summary for Subcatchment 3S:BARN Runoff = 0.06 cfs @ 12.08 hrs, Volume= 220 cf, Depth= 2.97" Routed to Pond PT:STONE TRENCH Runoff by SCS TR-20 method,UH=SCS,Welghted-CN,Time Span=0.00-30.00 hrs,dt=0.03 hrs Type III 24-hr 2-Yr 24 Hr Rainfall=3.20" Area(A CN Description * 890 98 DRIVE 890 100,00%Impervious Area Tc Length Slope Velocity Capacity Description min (feet) ft ft (ft sec) (cfs) 6,0 Direct Entry, Subcatchment 3S: BARN Hydrograph _ (_-ii-- 1- I_ III _1I1- 1lI y _ __ I,- 0.0 --..•��t,i _ - _- - [M Runoff T_1--i--r-T-' 1 - -r-I- - r-T-1- - r"T-1- 0.065 1 1 1 W fI 1 I I I1 1 I I I I IIr� 1 - - T - -- _I-1 _-1 I T'T-1 r-T-1 rT1 - I� V1 2 0.06 0.0 I I -_I I r _1_J L 1 J -L 4HAJ0 I 3i20" L_ I i f I I I I I 1 1 I I I I I I I I 1 I I I I I I f I I 0.05 -t-"- i--r•-+--li--i__r_r-y-� -r-*-1- --rR—Unb'��AtEsa�890 s - 0.045 i I i 1 I I 3 I I 1 1 I I I I .may] I I � I�,//J -T-. h'•1..-I......I.....r ..I....I--•I.-..T.....t noff 1 7 fo( 1.04 1 i i IL I I ��11�� I U. _l..J_..1__1__! 0.035 O ..L..4--I--6.-Y-J__I_.,1-..L...1.....4 ..L-.1.,-1- fi• 0.03 1 1 I I I I t-I T_r r I 1 1 1 1 I I 1 -t-7--1--r - -t- + -r-T- +--r-r-r--,__, 0.02 I i I I I I I -r- --,--r-T- r--I-- -r-T- .; r-7- �-- 0.02 I I �--1-- _i-;__,_^(-_�-�-_L. 0.015 I i 1 I I I i I I I I i I 1 1 I I I I I 1 L_1_JIL_1_J_-I__L_1-J l - 0.01 .-+-'1--1--I••-1--4- - -• -_1--1--F-'1•- r- 0.00 I I I I i 1 I 0 0 1 2 3 4 5 6 7 8 9 1011 12 13 14 15 16 17 IS 19 20 21 2223242528 27282930 T1ms (hours) Bk 18537 Pg273 #4276 243 GREAT POND ROAD_POST Type H/24-hr 2-Yr 24 Hr Rainfal1=3.20" Prepared by Patriot Engineering Printed 11/21/2025 H droCADA 10.20-Sc s/n 11576 ®2023 H droCAD Software Solutions LLC Pa Re 9 Summary for Subcatchment SC-100: PROPOSED Runoff = 0.33 cfs @ 12.11 hrs, Volume= 1,287 cf, Depth= 0.64" Routed to Reach DP-100:WETLAND Runoff by SCS TR-20 method,UH-$CS,Weighted-CN,Time Span=0.00-30.00 hrs,dt=0,03 hrs Type 11124-hr 2-Yr 24 Hr Rainfall=3.20" Area(sf) CN Description * 3,050 98 Ex.Roof,Ex.Patio,Prop Wall and Landings "- 156 85 Gravel roads,HSG B 20,812 61 >75%Grass cover Good,HSG 8 24,018 66 Weighted Average 20,968 87.30%Pervious Area 3,050 12.70%Impervious Area Tc Length Slope Velocity Capacity Description min) feet) (ft/ft) (ft/sec) (cfs) _ 6.0 Direct Entry, Subcatchment SC-100:PROPOSED Hydrograph 0.38 J i i 1 I I 1 I I I O.a10f� I I 1 I I I i I I I I 1 I r t I I 0.341_- �� I 1 i I I I I 1 I I i I I I I I I I I I 0.32. -_.""`.rTYr!1'1-.__--"7i.^_.'iiii'i_-`-_-_-^`"triP!'i`-`_'•_^-_•Ir1L--`_._'•.l.'J1I1-'«_«_.•.JJ'I I._"-__.-_"_'_"1r''I"'^_'-`.-_'rI1I''-_-_""'-11II I-._'-_1I'I-"__-i1 --'JfI'I-_'I •y- 1l !I'IL 'y+r�p' .. TS�1'"_a.3 01. �V 0.28 L-1r1 14';"1-_ -7 - - � 0.2 r r-" "r-7--1-r-I--r 0.24 UA Off A ' 6=91II��':_0-_ 1["_8" '�ICS rr .1 - 0.22 "_ 1ao; 4U !e0.2 -"� -_" -- .- .'1 1 1 1 I I 1 i I 1 0.18 '/ _+--1-��.._L-�_-1----�'-a"�__i 1 I 1 1 IR00 nR� �*t�I--i �r� --1__I__1-_4_+1_...__ ZJ-1---- 1-.. - 1__I_•- 0.16 0.14 .. I 1 I I I I I I I I t 7 I I I 1 I i I I 0.12I/� `'lN�(I�j.,�__ , 0.1 !_J__I_ L_1_ L_1_J _ I 1 I I 1 0.08 I I I 1 I I I I 1 J _1-J,._I__�.. I I I "I I .. ,- - 0.08 •-�-"1'-i`""r_�.._1.._I__r I__I_.. 1,: _.,.1.. �..�....1__t..�_�__I_...r_� �--IT_!..i__I__ 0.04 7_,_..1.._r_.�_.7_..f'r_T•,_I__ 0.02 0 0 1 2 3 4 5 8 7 8 9 10 11 12 13 14 15 18 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) Bk 18537 Pg274 #4276 243 GREAT POND ROAD—POST Type 11124-hr 2-Yr 24 Hr Rainfal1=3.20" Prepared by Patriot Engineering Printed 11/21/2025 HydroCAD®10,20-5c s/n 11576 ©2023 HydroCAD Software Solutions LLC Page 10 Summary for Reach DP-100:WETLAND Inflow Area= 24,908 sf, 15.82%Impervious, Inflow Depth= 0.62" for 2-Yr 24 Hr event Inflow — 0.33 cfs Q 12.11 hrs, Volume= 1,287 cf Outflow — 0.33 cfs p 12.11 hrs, Volume= 1,287 cf, Atten=0%, Lag=0.0 min Routing by Star-Ind+Trans method,Time Span=0.00-30.00 hrs,dt--0.03 hrs Reach DP-100:WETLAND Hydrograph I -1__I7L_7 _1_J_J__1--L_1_1_ i I I I I I I I 1 1 I I I I I I 1 i I I I I I I I i I I 1 '"i -i-+-J--I-.-L-h-1-J«_I«-1-- --1--I--1--1'_L-1--I--I--1--L-'1-.I--1--i--i'-1-+'- 0 Ir11iOW 0,36 0.330(8 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ®Outflow I -1_L_J__I_-I--L_1-J--1- _J_J_fiM L1 -4i- J 1I- 1 - 1 I 4 10.34 « - JII 1 0.32 L_1-.J-_I-.JI..-L_1-J-I--I--L-1-1.. 0.3 i I I I I 1 I J 1 i I I I I f I I I '�. I I....h.-{.--i.-..i....i _-1«-I«_,-..1-..h-.1--I..-I«..I__L-+••a--1....1_..F..L...1_ 0.28 i I L-1-4--:--6I -L-{...J-..I.... -J-J--1--L-1..-1-J.._I--I.._L_+-J-J-..i...-L 0.26 1 1 I I 1 1 I f I I r" ..L-+-4--1--L-L-+-J--1--1 -4--1--1--L-L-+.-..I..-I--I--L-+--1--1--1-- tL-{-1-- 0.24 �% "...L_1-J--I--I+-M..1•-J-.-i-_{- -..I. .I-.-I-...L-L-1-J--I--I--L-1-J.,J--i--L-1-1-. 0.22 ^„ ..+-+-4--I--I--L-1-4__I__1_ -I...d__I__L_L_i_J__I-_I__L_1_.I--I_-i__L_L_'J__ 0.2 �" _1-.!•--1-«I-_I--.S-_1_J__I__i J_J__I....L_L_1_J_-I__I__L_+_J_J__i__L...1_1_. 3 0.1$ O r" 0.16 0.14 / •' i ( 1 I I I I , i I I l I I t I I 1 I I I I i ( I 4--1--1 -1-4--1--1--1 -1_4-_I__.I.....1.-4--.4--I--I--L-{...4_I--I--F•_{-+ 0.12 I 1 1 I I I � -4 _1_-1__1__L_L_A.__I J-J--i__L_L_1«_ 0.1 f i I i I � +...;—a_-I:__1.._L_+_.�_J__f. 0.08 ' - I 'I-1..J-J-.,i.._1,-L-.4-- 0.06 i I I ..�...I-J--1--1-I-I--1--1--i. _+.,J--1--1--1•-4--4-4-"'i--1--4,-+-_ 0.04 0.02 0 1 2 3 4 6 6 7 a 9 10 11 12 13 14 16 16 17 18 19 20 21 22 23 24 26 26 27 28 29 30 Time (hours) Bk 18537 Pg275 #4276 243 GREAT POND ROAD POST Type U/24-hr 2-Yr 24 Hr Rainfall=3.20" Prepared by Patriot Engineering Printed 11/21/2025 H droCAD®10.20-5c s n 11576 ©2023 H droCAD Software Solutions LLC Page 11 Summary for Pond PT:STONE TRENCH Inflow Area= 890 sf,100.00%Impervious, Inflow Depth= 2.97" for 2-Yr 24 Hr event Inflow - 0.06cfs @ 12.08 hrs, Volume= 220 cf Outflow = 0.01 cfs @ 11.64 hrs, Volume= 220 cf, Atten=88%, Lag=0.0 min Discarded = 0.01 cfs @ 11.64 hrs, Volume= 220 cf Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf Routed to Reach DP-100:WETLAND Routing by Stor-Ind method,Time Span=0.00-30.00 hrs,dt=0.03 hrs Peak Elev=153.22' @ 12.64 hrs Surf.Area=140 sf Storage=68 cf Plug-Flow detention time=56.0 min calculated for 220 cf(100%of inflow) Center-of-Mass det.time=55.9 min(812.3-756.4) Volume Invert Avall.Stora a Storage Description #1 152,00, 224 cf Custom Stage Data(Prismatic)fisted below(Recalc) 560 cf Overall x 40.0%Voids Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet (cubic-feet 152.00 140 0 0 156.00 140 560 560 Device Routing Invert Outlet Devices #1 Discarded 152,00' 2.410 in/hr Exfiltration over Surface area #2 Primary 155.95' 10.0'long x 1.0'breadth Broad-Crested Rectangular Weir Head(feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef.(English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 Discarded Outflow Max=0.01 cfs @ 11.64 hrs HW=152.04' (Free Discharge) t-1=.Exfiltratlon (Exflitration Controls 0.01 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=152.00' (free Discharge) t-2=Broad-Crested Rectangular Weir (Controls 0.00 cfs) Bk 18537 Pg276 #4276 243 GREAT POND ROAD—POST Type 1/124-hr 2-Yr 24 Hr Ralnfall=3.20" Prepared by Patriot Engineering Printed 11/21/2025 H droCApe 10,20-5c s n 11576 ©2023 H droCAD Software Solutions LLC Page 12 Pond PT:STONE TRENCH Hydrograph LMI ♦ `"� »-1IrL^_rLII..^.rLII --1rLI -.,IIrL.-.IIL_'L�r-_irt..-1ii«---,rI--_IIfi'l-.,IL.,rII•.-I- I_,1-^1 I--I I- I II WwU.r I I 1 i 0.07 - ' ♦' I I I I I 1 1 I i I I 1 I I r I t I I I , I I I I i I I 0.085 I I I I I I I 1 I I I �Iy��I 0.06 "♦'• -r-r-r-r-IL I I ,--r-r- _I__I_P-6�k IE161* 1753-2Z- 1,- I I I I I I I i l I I I �♦ ,� ,._ _L_L L _J_J_J_J--1-A-J_J-.1_J_J_A_. 0.055 1 I I I I I i 1 I I i t I I I I I I # II/��(I !♦ �, 'r.-i-r-r-f"",--;-," f"i- •-I--I--1--j-I--Stora�C,�{�-IC8,"1i l ) ♦` /'' ♦ -t--r' F_,'_,'..,..-,--i..-i--I-- -I--I»..I__I_..1_"'i__I_y_',_-I_-t_'I.'i_�_'�_q_'I_, 0.045 ' 0.04 `,,•' r I I I I I I i I I I I I I I i I I I I I I I r I i I 0.035 '' ♦' I I I t I I I i I I I I I , I , I I I I t I I I i I 1 O ' ♦ ♦ I I 1 I I I I t i I t I I I I , I I I I I I 1 I i i 1 1L 0.03 .' ,♦ I I r I I I I , i I I I I I 1 I I 1 ! I I I I I i i I ' - r-r-r-r -r-r-r-t-«I-^rt-�-�- 0.025 I ♦'' _L+L-4-L^1-..L_L_t_..i_...h I.-..I....I_.-I--i..-I«.,J..-I-4-1-4--I. 4-.41-J,-Ji-.1- 0.02 ♦'' ` I I I I i I I I I I I I 1 f I I I I i i 01.015 I I I 1 1 1 0.01 o,00 ors 0 1 2 3 4 6 8 7 8 0 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 28 27 28 29 30 Time (hours) i i Bk 18537 Pg277 #4276 243 GREAT POND ROAD POST Type III 24-hr 10-Yr 24 Hr Rainfail=4.80" Prepared by Patriot Engineering Printed 11/21/2025 HydroCAD®10.20-5c s/n 11576 ©2023 HydroCAD Software Solutions LLC Page 13, Summary for Subcatchment 3S: BARN Runoff — 0.10 cfs @ 12.08 hrs, Volume= 338 cf, Depth= 4.56" Routed to Pond PT;STONE TRENCH Runoff by SCS TR-20 method,UH=SCS,Weighted-CN,Time Span=0.00-30.00 hrs,dt=0,03 hrs Type III 24-hr 10-Yr 24 Hr Ralnfall=4.8011 Area(sf) CN Description * 890 98 DRIVE 890 100.00%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S: BARN Hydrograph I i ( I I I I I 1 i I I 1 I I I I I i I I I 1 I I I i I , 0.105 •_1_J__i__L_J_J__I__L_.1_J__L_L_J__I__L_1_J__I__L_J_J__I__L_1_J_-l._L_1-_1_.. ®Ru(�ff I , i I I I 1 I I i I I I I I I I I i I I I I I I I I I I 0.1 1.-«I.. I -.1-- J--I--1--4«.4•0100(S -J -I'-1,- J__i-_1-_4_',__1__1,--1_J_ _1._d_-1-- 0.095 i 1 I -i•- -_I--r-y_y««,«..r..y..,-•_ I_-,--r-*- --1--r-t--I-- tle--1114?hr 0.0 I 1 _ L I -T--i--i-r-'I--I--j_r_i_-i--i -�_",'_r..r»�_`t_"i...T-j__I r T'- I"i 0.08 I I i I I I I I I i i I I 1 I I i i I I I 1 I i I 0.075 Y J �i�{ucrofi�- re =$ 01 - I i i I I I I I I i i I I t I I0.0 I I I 0.06 � -T-�--t--r-T^-1--I`-T-T-7-- 1� 0.06' -T-�--;-r--r-�--;-r-T--,__� _-r_-,--r-r-7--b-r-T-�--1--ry-r--,--r-r�T�+--1-- �0.065-' -L "I--' L 1_J__I__L_1__I_ _ !__I_ L_L_J_-[1an11�rh"1r �iJIV�}__ I " i i""I " I 11 t I i -i I I I I I 11 p 0.05 I--A- 4-- L..L_J.._i_-L_1..J-_I_-L-:1. .J..k4 «L..J__1__ , i 1 I I 1� �0.045 A.» ....i_.' -r--t-- '1--1-_ .1....1--1--4--t._...i....{--.{'-'1--I--F../0, I J i i I I I 1 I I I i I I I I I i i I I I I T I 0.04. 0.036 i I I I I I I I I i i I I I �■w�Y�- -T_-I-_r'r".�..'7.._I�_r�'I'""t_- 'I__I__r_r_�__t_-•r-T_�__I__r_•r•-�- ry ' I I i I I I I I 1 i , I I I I 1 i i I l t 1 I I 0.03 »T_l-��_r-T»_I«_L._r_.�_»I-- 7--,--,--r-i--,--ti -r--;_.1_..L. r`.i I-- 0.025 1 i I 1 0.02-' _1_J__1__L_1_J__L_L_J_J_- J__1_—L_1_J__i__L_J_J__I«-L-1_J__L_L_J__I__ I i i I I I I I I I I I I I I i I I I I I I I i I I 0.015 ._�'-4--I--t'-4-4-_I--1-_a»-I`• --I-^I--t'- --t--'I-+-4--I--F-{--I--I-._1-J.- 0.01r-+--I-- ' 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 26 28 27 28 29 30 Time (hours) Bk 18537 Pg278 #4276 243 GREAT POND ROAD POST Type 11124-hr 10-Yr 24 Nr Ralnfoll=4.80" Prepared by Patriot Engineering Printed 11/21/2025 H droCAD®10.20-5c s n 11576 ©2023 H droCAD Software Solutions LLC Page 14 Summary for Subcatchment SC-100:PROPOSED Runoff — 0.98 cfs @ 12.10 hrs, Volume= 3,188 cf, Depth= 1,59" Routed to Reach DP-100:WETLAND Runoff by SCS TR-20 method,UH=SCS,Weighted-CN,Time Span=0.00-30.00 hrs,dt=0.03 hrs Type III 24-hr 10-Yr 24 Hr Rainfall=4.80" Area(sf) CN Description * 3,050 98 Ex.Roof,Ex.Patio,Prop Wall and Landings 156 85 Gravel roads,HSG B 20,812 61 >75%Grass cover,Good HSG B 24,018 66 Weighted Average 20,968 87.30%Pervious Area 3,050 12.70%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment SC-100: PROPOSED Hydrograph y,Runoff -4 -4-'"1--1'--I � I I I I I I I I I 1 I I I I I I I i I I I 1 I I 1 1 I i 1 I I I I I 1 i 1 I I I I I t I I I I I 1 I i I I 04,r 24 Hr; R.aInfal1:4.80'" I I I I I I I I 1 f.unb* A'4 .ea424,618isf I I 1 1 1 1 1 1 1 1 1 ! I I ��n;0 u41 rr0=3r.$8.Cj i 1 I I I I I 1 I I I 1I 44 IR66i 60 Qeot T •I.�R/'I �1 I I 1 1 I LL 1 I i I I I I I 1 I I 1 I I I l 1 I 1 I I .T� : in!i 0 I I i I I I I I I I i I 3 I I I I I I I I I I f I i 1 l I I i I I I I I I I I I f I I I 1 i I I I I I I 1 I 1 I I I i I I 1 I I I I l I I I I 1 I I 1 I I I I I i I I I I i I I I I I 1 I 1 I I 1 1 1 I I I 1 I I I 1 I I I I I I I I I t I I I I I I I I t I I I I I I I i I I I I 1 I 1 I 1 1 I I I I I i I I 1 I I I I i I I 0 1 2 ^3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) Bk 18537 Pg279 #4276 243 GREAT POND ROAD—POST Type Ill 24-hr 10-Yr24 Hr Rainfall=4.80" Prepared by Patriot Engineering Printed 11/21/2025 H droCAD•10.20-5c s n 11576 ®2023 HydroCAD Software Solutions LLC__ .__ Page 15 Summary for Reach DP-100:WETLAND Inflow Area= 24,908 sf, 15.82%Impervious, Inflow Depth= 1.54" for 10-Yr 24 Hr event Inflow = 0.98 cfs @ 12.10 hrs, Volume= 3,188 cf Outflow — 0.98 cfs @ 12.10 hrs, Volume= 3,188 cf, Atten=0%, Lag=0.0 min Routing by Stor-Ind+Trans method,Time Span=0.00-30.00 hrs,dt=0.03 hrs Reach DP-100:WETLAND Hydrograph I i i I I I I I I I I I I 1 t I I I i I I 1 I I I I i t I I I I 1 I I I I I I I I I I I I I I Inftrnv -*-y--I--I- *-.f"-I-'1--1--I-- - --I--r-r-'t--t--I--F-*-1--1--I--I•-t-i--i--i--t- ®Offcyw I i i 1 I I I I I I I I I I i I I I I I I i ufflow Inflow Arel6=�24,PW s 1 t i 1 I I 1 I I I I I I 1 I I I I I I I I I I I I I I I ( 1 1 I I I I pill I I i I I I I 1 I I I I I I I 1 I I I I I I I 1 i I I I i i I I I I I I I I I I I I I i I I I I 1 1 I i 1 I 1 I i I I I I I I I 1 I I I I I i I I 1 I 1 r I 1 I 1 f i i I I I I I I I I I I I I I i I I I I I I I i i I f I i I I I I I I I f I I I I I i I I I 1 I I I i 1 I I 1 i I I I I I l I I I 1 I I I i I I I I I I I i i I I i i I I I 1 1 I I I I I I 1 1 I I I I I I I I i i I I I i I I I 1 r I I I I I I I I i I I I I I I I t i I 4 p, I I i I I I I I I 1 I 1 I I I I i I I I I 1 1 I 1 t I I I i 1 I I I I I I I r I I I I i I I I I 1 I I i t I I I i 7 I I I 1 I I I r 1 I I I 1 I I I I 1 I I i t I I i i I I I I I I I I I I I I 7 1 1 I I I I I i l I j I i i I I 1 I I 1 I I I f I I I i f 1 0 1 2 3 4 'S 6 7 8 9 10 11 12 1$ 14 15 16 17 16 19 20 21 22 23 24 26 26 27 28 29 30 Time {hours} 1 Bk 18537 Pg280 #4276 243 GREAT POND ROAD-POST Type 1/124-hr 30-Yr 24 Hr Ralnfall-4,80" Prepared by Patriot Engineering Printed 11/21/2025 H droCAD°10.20-5c sin 11576 m 2023 H droCAD Software Solutions LLC page 16 Summary for Pond PT:STONE TRENCH Inflow Area= 890 sf,100.00%Impervious, Inflow Depth= 4.56" for 10-Yr 24 Hr event Inflow = 0,10 cfs @ 12.08 hrs, Volume= 338 cf Outflow = 0.01 cfs @ 11.25 hrs, Volume= 338 cf, Atten=92%, Lag=0,0 min Discarded = 0.01 cfs @ 11.25 hrs, Volume= 338 cf Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf Routed to Reach DP-100:WETLAND Routing by Stor-Ind method,Time Span=0.00-30.00 hrs,dt=0.03 hrs Peak Elev=154.19'@ 13.03 hrs Surf.Area=140 sf Storage=123 cf Plug-Flow detention time=112.6 min calculated for 338 cf(100%of Inflow) Center-of-Mass det.time=112.5 min(861.2-748.7) Volume Invert Avail.Storage Storage Description #1 152.00' 224 cf Custom Stage Data (Prismatic) Listed below(Recalc) 560 cf Overall x 40.0%Voids Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) _ (cubic-feet) 152.00 140 - 0 0 156.00 140 560 560 Device Routing Invert Outlet Devices #1 Discarded 152.00' 2.410 In/hr Exfiltration over Surface area #2 Primary 155.95' 10.0'long x 1.0'breadth Broad-Crested Rectangular Weir Head(feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef.(English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 Discarded OutFlow Max=0.01 cfs @ 11.25 hrs HW=152.04' (Free Discharge) 't-1=Exfiltration (Exf3ltration Controls 0.01 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=152,00' (Free Discharge) Z-2=Broad-Crested Rectangular Weir (Controls 0.00 cfs) Bk 18537 Pg281 #4276 243 GREAT POND ROAD POST Type fit24-hr 10-Yr 24 Hr Rainfall=4.80" Prepared by Patriot Engineering Printed 11/21/2025 Hi droCAD®10.20-5c s n 11576 ©2023 H droCAD Software Soiutlons LLC Page 17 Pond PT:STONE TRENCH Hydrograph . -I -1 -L I -I -I - -1 -I -1 -L I -I -I -I -, -I -1 -I -I -, -1 -1 ~, -1 -L L ,♦ ^r^r-F^r-F-r-r-r-F-h~F^r^r-r-F-r-r-r-r^r-F-r-r-r-r-r-r-r~r- ®InflOW i i 1 I I L_L i i I I 11 _t _I ~ IOuWow ^r4 ^�"r'r—r—r«I "r'r i i t r"r ,''♦' ' _L.«L_L«M-1--1-- L«H..4-L« -.L-L /L�.��jL«/� L- ''Q1 �_ x_ ®Discarded 0.105 '' i 1 , 1 1 1 1 1 1 1 ��I�,.r'F�► /"1-tO4 41+�/>�I ��I ®Primary ',' ' -rr-r-r~r-r-r-r-r-r-r -r-r r r r r r- 0.1.''�',`/�`, ♦ , i I I I 1 1 1 1 1 1 I I I Ic,�yy 1 1 IQ I I 0.095., ' -r_r_r«r«F_t«F-r»t«r_ _r-r-��.r ^r T.r "' A "T« I-4rr ♦ �' 1 I I 1 I 1 1 1 1 1 I -- 1 -- i 0.09 ♦' »; 0.085 ' , ♦ ,` _r..-L.-h»t-_L-L-L-L-i--L..I -L«L_4.«L_L L L_4..L-L_L»L-L 1 L_L L.. ♦ ,` ♦ i` i 1 I I I I I I i i I I I I I I �IQ /+ 0.08 ,' , -r-r-r-r-r-r~r-r-r-r- -r-r-r"r-r ��>�gQ��rfJ'Vr17� - 0.075 ♦',♦' ' -1 -L_L_L_L_L_L_L_L~L_ _L_L_L_L_L-L-L L_L___L_L_L_1_1_L_1_ ♦ ♦ ,' i I 1 I I I I I i I I I I I I I 1 I I I I I I I I / I 0,07 _0.065 ',,' • 1 1 1 1 I i i 1 1 1 1 1 1 1 1 I 1 I I 1 I i ♦,, ♦ � r r r r r r—�»r—r r I r—�«r_' r r 1 r r—r—r ,�—r r 7— "0 0,08 - _L_�_L«�-L_L_L_L_ _L-t -t_s _I-_i _1 _L_L_L-L-+ -i•-y_L_L_L_�'�''' I I 1 1 1 1 1 1 1 1 1 1 1 1 I t 1 1 I 1 1 I I I I I I ,',' ♦•-r-r-r-r-r~r-r-r-r-r- 3 0.05 ' ♦', -L_L_L_l_L~L_L_L_L_L_ _L_L»L_L«L_L_L_L_L«L«L_L_L_L_L_L.-L_ � ♦' ' ♦ , 1 1 I I I i 5 I t i I I I I I i i I I I I I I I I i I C0.045-' r—r—r—r—r—r—r—r—r—r—r—r—r—r—r—r—r- 0.04 � • ,' ' 1 I I 1 1 t 1 I 1 1 1 I I 1 1 1 I ,' -1 r-r"1 -1 "r"r"r-r"r- r-r-r-r-r-r-r-r-r-r-r-r-r-�-r"r"r_ 0.035L-Y- ♦ , ♦ 1 I I I I I I I i i I I I I I i I I I I 1 11 I I I I 1 0.03 ~r-r-r-r-r-r~r-r-r-r r-r-r-r-r-r 0.026 ,'�♦','' r 1 I I 1 1 pp/Yff3 0.02 ♦',` ♦' OAl ors 0.015 0.01 0, 0 1 2 3 4 5 6 7 8 9 10 11 12 1314 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hour's) Bk 18537 Pg282 #4276 243 GREAT POND ROAD—POST Type W 24-hr 100-Yr 24 Hr Rafnfalf=8.80" Prepared by Patriot Engineering Printed 11/21/2025 HydroCAD®10.20-5c s/n 11576 a 2023 HydroCAD Software Solutions LLC _ Page 18 Summary for Subcatchment 3S:BARN Runoff = 0.18 cfs @ 12.08 hrs, Volume= 635 cf, Depth= 8.56" Routed to Pond PT:STONE TRENCH Runoff by SCS TR-20 method,UH=SCS,Weighted-CN,Time Span=0.00-30.00 hrs,dt=0.03 hrs Type III 24-hr 100-Yr 24 Hr Rainfall=8.8011 Area(sf) CN Description * 890 98 DRIVE 890 100.00%Impervious Area Tc Length Slope Velocity Capacity Description min (feet) ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S: BARN Hydrograph I _}"')--i--�._.I-.{--1-`F..y_�....E•-H-a--I-"F-••a-a..._I_..r--+-'t--I-•�f-1--1-._1__M'4`-I-- 0.19 I i i I I I I 1 I I 1 I I I I 1 I i 1 I I 1 1 I i 3 I g Runoff -}--i--i--!'-{- --I__J•_J--I'-h'.y_{--i--f- t•-'1--1--t--{-'1--I--N }_.{--I--t'-{--I-- I i i I I I I 1 r I a.48 ors I i , I I I t I I I I I I I t I I 0.18 -+-a--r--F_y_a^_1--r_y-, -y--t--r--+•-y--t--*-+_-�....I r-1r}1--tI-- 0.17 '� .- �- --1--r-+-�--1 -r`y-�-- - +--I--r-r-•--1--r -* --:-ty ey��- I ! ! I I I I r 1 I i 1 1 I I I ! I I I I I 1 0.16 I I ,-- -y--I-1r00=Yr'-2 •HrRa:infgIf.,':&.8;0"-- 0.15 -?--1-_i-_r_-t--1-_ram-1•_i-I-- _y__I__I-_r--,_-I-^t-•t--I--I__r`y_y__r_r._y__I.-.. I I 0 0.14 oq _r_ y -r^-r`y-y--I--*-y--1`-F -y--I--I -+-a"1- t�ii n fft - *eA="0,sf- I I I _.r_.,1.._r...H-+--+--I--*-y--1-- -•I-^I--�-r^ti/�r-r-+ y�-j�I- F-y-�+^^r- +-- 0.12 ------ _r ..7--I--r-_r•-..I l.�.. "i/��''��.y.]IIL..�1./ 'T'^ 0.11 ..}--+--I--r-y-y--r-r_y_.�•-_r ..y_-I--h-_}-M__I"inr.Q�WII O 1 � ti--r-r-y--I-- p 00 "t"t--i--r^t^-!-"r^r-'I--,-- "y_...1»»r^•r-^I^-l--o-,»-t__I__r�\i""*'V��r�f�f�i - u 0.08 0.07 - -r-�--r-r_�_-t_-r^r--r-�_^ -I--r-r-r-ti__I__r^t•--t--r-r-t--t---��■■ .,� TT.." 0.08 r I r I I I r 1 1 1 I I I 1 t r I I I -r--,--r-r-•r`�I-`•1`-r--r--t-- -.1--r`r-•r-t-_4--r-t--,--r-r-t`�-`w`r-t--I-- 0.05 I i i I •-r-'t-`i`-r-'r----I--r-1--1-- 9--I--r-r-'1--1'-r-t--I--I""r"7--I--r-r-'t--I-- 0,04 I i i I I I I I I 1 1 I I I I 1 I 1 I i 1 I -•r...�-..1----r-rz--r-r-i-�-- �-^I"'r-r-�--r-r-t-�--1--r-Y`�--r-r-T--1-- 0.03 rI -T--I--r-r--r-�--r- -,"i- �--r-r-r--1__I_"r-•'r-�--I--r-�-�--r-r"'r--1-- 0.02 - i i r 1 I I • r"i--i--r^'f-1--I--r-'I"- 0.01 0 . 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1$ 16 17 18 19 20 21 22 23 24 25 28 27 28 29 30 Time (hours) Bk 18537 Pg283 #4276 243 GREAT POND ROAD—POST Type 1H 24-hr 100-Yr 24 Hr Ralnfall=8.80" Prepared by Patriot Engineering Printed 1 112 1/2 0 2 5 HydroCAD°10.20-5c s/n 11576 *2023_HydroCAD Software Solutions LLC Paee 19 Summary for Subcatchment SC-100:PROPOSED Runoff = 3.01 cfs @ 12.09 hrs, Volume= 9,351 cf, Depth= 4.67" Routed to Reach DP-100:WETLAND Runoff by SCS TR-20 method,UH=SCS,Welghted-CN,Time Span=0.00-30.00 hrs,dt=0.03 hrs Type III 24-hr 100-Yr 24 Hr Rainfall=8.80" Area(sf) CN Description * 3,OSO 98 Ex.Roof,Ex.Patio,Prop Wall and Landings 1S6 85 Gravel roads,HSG B 20,812 61 >75%Grass cover,Good,HSG B 24,018 66 Weighted Average 20,968 87.30%Pervious Area 3,050 12.70%Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment SC-100: PROPOSED Hydrograph I 1 i I I I t I 1 I 1 I I I I I I I I I I I I f I I i 7 I �Runoff -4--I--F-r'-'I--I--I•-+--I--I- I I 24j I I 3 TYRe:III hr ) pill 1 Ob-S 24 IH R i fzl11-8.8141" I I i I I I I I I I i l I I I I I I I I 1 I R,uhdff;A;rea'44,P 18;s, I I i I I I I i I I i I I I l I 1 i I I I I I I 1 �, •'i-»L-_i_�..�_»L.._r...�__I....I_._1 .._1_....�..7_.-I 1 I �y�) 7r�yp,.� I I 2 I I Runbff Qip#hi I /� {/.��I i-}�17 ITC:4�0:niih I I 1 1 1 I 11- _1_J__L. - � I I i 1 I I I I I I I I I I 1 I i I I I I I I i i 1 I I I I I 1 I I I I I I I I I I I i I 1 I I I I I i I I 1 I I I I I I I I I I I I I I I i I I I I 1 I I t I I I I I I I I I I 1 I I I I I I i I I I I 1 I I i I I I I I I I 1 I I I I I I I I r I I I I I t I i I I I I I I I I I I I I I 1 I 1 I I I I I I f I i I I I I i I I I 1 I 1 I I I 1 I I I 0 1 2 3 4 5 6 7 8 8 10 11 12 13 14 15 i6 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) E Bk 18537 Pg284 #4276 243 GREAT POND ROAD—POST Type/it 24-hr 100-Yr 24 Hr Rafnfa11=8,80" Prepared by Patriot Engineering Printed 11/21/2025 N droCAD®10.20-5c s/n 11576 ©2023 H droCAD Software Solutions LLC Page 20 Summary for Reach DP-100:WETLAND Inflow Area 24,908 sf, 15.82%Impervious, Inflow Depth= 4.54" for 100-Yr 24 Hr event Inflow = 3.01 cis @ 12.09 hrs, Volume= 9,426 cf Outflow = 3.01 cfs @ 12.09 hrs, Volume= 9,426 cf, Atten=0%, Lag=0.0 min Routing by Stor-Ind+Trans method,Time Span=0,00-30.00 hrs,dt=0.03 hrs Reach DP-100:WETLAND Hydrograph 1 i I I I I t I I i I I I I I 1 I 1 i I I I I I I I t I I ®-- Inflow a oulllµow 3.M.pf3 -I--r'_t-'1--I__} l'-T-�--I-^f--1--t-h..y-.«I^gyp.. 3i,M Q5' ; II II I I I ( AI rI e1 aI=2tI 4I ,pV 8 s f I i I I 1 i I I I I I I I I I I I I I i I I 1 I I I I I I I I 1 i I I I I I 1 I i I I I I I i i I 1 I i I I I i I I 1 I I I I I I I I i I I I I I i i I 1 I I I I I I I I I I I I I I I I I i I I I I I i i I I 1 I I I I i I I I I I I I I I I I i I I I I I 1 i 1 I I 1 I I I i I I / _+_y__I..«.r..�..+-.�_�__I__r _•-I__1-...+...!_y__I__1._+..y....l_»I^_1.._+...y..«i.,�.r..1._ 2- -I- I--4-.4--4- 1.-{._.4--4-..i-...,.-{"4--I--I--~-+- -_i--~-/"- I 1 I I I I I 1 1 1 I I I } I ( ( I I I I I 1 I { I I I i I I I 1 I I I l i I 1 I I I i i I I I I I I I t I I 0-1401 I 1 I 0 1 2 3 4 5 6 7 6 9 10 11 12 13 14 16 16 17 18 19 20 21 22 2$ 24 25 26 27 28 29 30 Time (hours) Bk 18537 Pg285 #4276 243 GREAT POND ROAD-POST Type U/24-hr 200-Yr 24 Hr RainfaI14,80" Prepared by Patriot Engineering Printed 11/21/2025 HydroCAD®10.20-5c s/n 11576 ©2023 HydroCAD Software Solutions LLC Page 21 Summary for Pond PT:STONE TRENCH Inflow Area= 890 sf,100.00%Impervious, Inflow Depth= 8.56" for 100-Yr 24 Hr event Inflow = 0.18 cfs @ 12.08 hrs, Volume= 635 cf Outflow = 0.09 cfs @ 12.31 hrs, Volume= 635 cf, Atten=49%, Lag=13.3 min Discarded = 0.01 cfs @ 9.72 hrs, Volume= 560 cf Primary = 0.08 cfs @ 12.31 hrs, Volume= 75 cf Routed to Reach DP-100:WETLAND Routing by Stor-Ind method,Time Span=0.00-30.00 hrs,dt=0.03 hrs Peak Elev=155,97' @ 12.30 hrs Surf.Area=140 sf Storage=222 cf Plug-Flow detention time=204.1 min calculated for 634 cf(100%of inflow) Center-of-Mass det.time=204.1 min(944.1-740.1) Volume Invert Avail.Storage Storage Description #1 152.00' 224 cf Custom Stage Data(Prismatic) Listed below(Recalc) 560 cf Overall x 40.0%Voids Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 152.00 140 0 0 156.00 140 560 560 Device Routing Invert Outlet Devices #1 Discarded 152.00' 2.410 in/hr Exfiltration over Surface area #2 Primary 155.95' 10.0'long x 1.0'breadth Broad-Crested Rectangular Weir Head(feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef.(English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 Discarded OutFiow Max=0.01 cfs @ 9.72 hrs HW=152.04' (Free Discharge) t41=Exfiltration (Exfiltration Controls 0.01 cfs) Primary OutFlow Max=0.06 cfs @ 12.31 hrs HW=155.97' (Free Discharge) t2=Broad-Crested Rectangular Weir (Weir Controls 0.06 cfs @ 0.35 fps) Bk 18537 Pg286 #4276 243 GREAT POND ROAD_POST Type I//24-hr 100-Yr 24 Hr Rainfal1=8.80" Prepared by Patriot Engineering Printed 11/21/2025 H droCAD"10.20-5c s/n 11576 m 2023 H droCAD Software Solutions LLC Page 22 Pond PT:STONE TRENCH Hydrograph ^r^r^r-r-r-r-r-r-r-r-r-r-r-r-r-r-r-T-r-r-p- r t I t I I I r I i i r r I I I I i i I I I I i I , r M liw + -r-r-r-r-r -r-r-r-r-r-r-r-r-r-r-r-r-r-T-1. 4 r- I�lOumow r_r, I- L-L_L-L-L-L_ 0.18gf4 ryL_L_L_L_L_1_L_L_L^L_L..L_L_L_1_i_1_ ®outfloded 0.19 »Primary -r-r-r-r-r-r-r-r-r-r-r-r-r-r-r-r-r- 0.18 I I , I i �I + r-r r"r-r-r-r-r-r-r- - r-r- r�a,r� r ��_/�_�=�'y' iYy r 0.17 ++ L L L_L_L_L_L_L_I _L-L- _imGl L Ib- 'C^1�. -r -!_1_ 0.18 +.' ,•' I I I I I i I I , r i i I I r I , , , I i i I r I , , I F-F-F-F }_�._}_}_h..F.-}j�jt�♦,q♦-F 0.15 I I I r j�''�r n /J�/, r + ++ + -r-r-r-r-r-r-r-r-r-r- -r-r-r-r-ri.IrgV�fif.TGr - 0.14 ,+� I r I I I I I , r I I r , , , I I +�,�, _L_L_L_L_L_L_L•.L_L_Lv -L_L_L_L_L_i_L_L_1_L_L_L_L_1_1_L_1_ _ 0.12 + _} 0.09cfd. 0.11 + -r-r-r-r-r-r-r-r-r-r - 0.1 r r i r r r r t r i r r _r_r _;_r_r_r_ - _r _r_r^r_r_r_j_j_r^r_r_r_ O 0.09 _L-L^L•,L_L»L_L O.OB Hs L L_L-L_L-L_L_L-L_L_L_L_L_L..l_L_L_L_ t4 0.08 +'++',+ ,•-r-•r-r-r-r-r-r-r �r •r-r-r-r-r-r^r-r-r-r-r-r^r-4^r^r^r^ 0.07 I I -r-r-r-r-r-r-r-r r 'r-r-r-r-r r-r-r-r-r-r-r-r-r-r-r-r- 0.08 0.08 -t.-L_L-I_-L L_L_L L 004 0.03 + ' 0.02 0.01 0 0 1 2 3 4 5 8 7 8 9 10 11 t2 i3 14 15 18 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) Bk 18537 Pg287 #4276 Project Name: 243 Great Pond Road North Andover, MA Applicants: Stephen and Judi Boyko 243 Great Pond Road North Andover, MA Party Responsible for Maintenance During Construction: Contractor Party Responsible for Maintenance After Construction: Property Owner Er2sion and Sedimentation Contr2l Measures during Qgnstruction Actlylties Filtermitt Filtermitt will be installed along the down gradient limit of work as depicted on the Site Construction Plan. The Filtermitt will be installed prior to the commencement of any work on- site. An additional supply of Filtermitt shall be on-site to replace and/or repair Filtermitt that is disturbed. The lines of Filtermitt shall be inspected and maintained on a weekly basis during construction. No construction activities are to occur beyond the Filtermitt at any time. Sediment shall be removed once the volume reaches Y4to Y2the height of the Filtermitt. Surface Stabilization The surface of all disturbed areas shall be stabilized during and after construction. Disturbed areas remaining idle for more than 14 days shall be stabilized. Temporary measures shall be taken during construction to prevent erosion and siltation. No construction sediment shall be allowed to enter any infiltration system or formal drainage system. All disturbed slopes will be stabilized with a permanent vegetative cover. Some or all of the following measures will be utilized on this project as conditions may warrant. a. Temporary Seeding b. Temporary Mulching C. Permanent Seeding d. Placement of Sod e. Hydroseeding f. Placement of Hay 9. Placement of Jute Netting Dust shall be controlled at the site. Tree Protection Existing trees to be saved shall be protected with orange construction fence (offset from the tree trunk by professional standard based on canopy). Bk 18537 Pg288 #4276 Stone Edge Construction activity above and around the proposed location of the stone edge facility shall be limited to prevent compaction of the existing soil. Installation of this system shall occur under dry weather conditions and full stone depth shall be installed immediately to prohibit the introduction of fines or other material that would compromise the functionality of this system. Removal of Sediment and Erosion Controls At the completion of construction activities and after receiving approval from the Town of North Andover, all physical sediment and erosion controls shall be removed from the site. Long-Term Insoggtion and Maintenance Measures after Construction Erosion Control Eroded sediments can adversely affect the performance of the stormwater management system. Eroding or barren areas should be immediately re-vegetated. Debris and Litter Removal Trash may collect in the BIVIP's, potentially causing clogging of the facilities. All debris and litter shall be removed when necessary, and after each storm event. Sediment and debris collected from vacuuming and/or sweeping should be disposed of at a permitted waste disposal facility. Avoid disposing of this material on site Stone Drip Edge The drip edge shall be inspected after all major storms and on regular bi-annual scheduled dates. The drip edge shall be cleared of any debris on a biannual basis. The first 1/2 inch of stone can be removed and replaced if the edge becomes clogged Debris and Litter Removal Trash may collect in the BIVIP's, potentially causing clogging of the facilities. All debris and litter shall be removed when necessary, and after each storm event. Sediment and debris collected from vacuuming and/or sweeping should be disposed of at a permitted waste disposal facility. Avoid disposing of this material on site /0 Ope&-q A 4, Bk 18537 Pg289 #4276 ST RMWATER MANAGEMENT CONSTRUCTION PHASE INSPECTION SCHEDULE AND EVALUATION CHECKLIST PROJECT LOCATION: 243 Great Pond Road WEATHER: Inspectl Required Follow-up Inspect Area Comments Recommenda Inspection on Inspection Required Date ar inspected Frequency It !°n (yes/no) BMF Flltermitt Weekly and After Major Storm Events (1) Refer to the Massachusetts Stormwater Handbook,Volume Two:Stormwater Technical Handbook (February 2008)for recommendations regarding frequency for Inspection and maintenance of specific BMP's. (2) Inspections to be conducted by a qualified professional such as an environmental scientist or civil engineer. Limited or no use of sodium chloride salts,fertilizers or pesticides recommended. Other notes:(Include deviations from: Con.Comm.Order of Conditions, PB Approval,Construction Sequence and Approved Plan) Stormwater Control Manager: Bk 18537 Pg290 #4276 STORMWATER MANAGEMENT_ AFIER CQNSIRUCTION INSPECTION SCHEDULE AND EVALUATION CHECKLIST PROJECT LOCATION: 243 Great Pond Road WEATHER: Inspecti Required Follow-up on Inspect Area Inspected Inspection Comments Recommends Inspection or p Ion Required Date Frequency if (yes/no) BMF Drip Edge Bi-annually and After Major Storm Events (3) Refer to the Massachusetts Stormwater Handbook,Volume Two:Stormwater Technical Handbook (February 2008)for recommendations regarding frequency for inspection and maintenance of specific BMP's. (4) Inspections to be conducted by a qualified professional such as an environmental scientist or civil engineer. Limited or no use of sodium chloride salts,fertilizers or pesticides recommended. Other notes:(Include deviations from: Con.Comm.Order of Conditions, PS Approval,Construction Sequence and Approved Plan)Stormwater Control Manager: M. PAUL IANNUCCILLO, REGISTER ESSEX NORTH REGISTRY OF DEEDS E-RECORDED