Loading...
HomeMy WebLinkAboutCorrespondence - 140 ACADEMY ROAD 6/29/2011 andover 1 East River Place Methuen, Massachusetts 01844 consultants Tel. (978) 687-3828 Fax (978) 686-5100 www.andoverconsultants.com June 29, 201.1 -----Nofth,,,kndover Planning Board Town Offices cc 1600 Osgood Street North Andover, MA 01845 tIORTH M4DOV�E�R RE Land Disturbance Permit: PLANMNG DEPARTMENT 140 Academy Road at Stevens Street North Andover, MA Ladies and Gentlemen: Enclosed please find attached: • Revised site design plan set, sheets 1, 2 3, 4, 5 and 6 of 6, prepared for Tom Patenaude, dated November 10, 2010., last revised 06-27-11, 4 copies. • "Stormwater Report Supplement",prepared for Tom Patenaude, dated June 28, 2011, 4 copies. The attached plans were revised to incorporate several review comments given to us at a meeting, at the Planning Department,with Lisa Eggleston, Judy Tymon and Jennifer Hughes, on June 3, 2011 and at a second meeting with Judy, Jennifer and Gene Willis on June 14, 2011, also held at the Planning Department. The revised plans include the following: 1. The existing catch basin in front of Lot 2B is proposed to be replaced with a new structure that provides a four foot deep sediment sump. The existing sump is 21 inches deep 2. The excavated area at the existing basin has been enlarged to provide more temporary stormwater storage. A 10 scale detail of this area has been added to the plans. 3. The flat basin grate is proposed to be replaced with a beehive grate to minimize possible clogging of the grate. 4. A vented oil and debris trap ("Snout" as manufactured by Best Management Products, Inc.) is proposed to be installed on the catch basin to contain oil and debris from discharging to the existing drainage system. The existing basin does not have this feature. Civil Engineers ® Land Surveyors e Land Planners 5. A small pea stone berm is proposed to be placed just downstream of the driveway at Lot 2B to serve as a sediment trap to intercept suspended solids from the Lot 2B drive. 6. A bituminous concrete berm has been added to each driveway to divert runoff from most of the driveway directly into the proposed swale along Stevens Street. 7. Each driveway cross slope has been revised to 2.25%to pitch to a 6-inch deep swale constructed along the edge of each drive. 8. A typical detail of the retaining wall drain outlet has been added to the plans, see sheet 6 of 6. 9. Corrected the outlet elevation of the existing culvert in front of Lot 5 and provided additional topographic information downstream of the existing culvert. 10. Provided a"Snout" oil and debris trap for the pipe outlet in the proposed drop inlet structure, as was done for the existing basin at Lot 2B. 11. The slope on the lowered culvert has been revised to 2%, at the request of Gene Willis. 12. A rip rap apron has been added to the outlet end to mitigate outlet velocity. The riprap basin was sized using USDA-SCS Nomograph for a round pipe flowing full with minimum tail water condition. Nomograph is attached. The stormwater reportsupplement was revised to update the calculations per the relevant revisions noted above. The Operation and maintenance portion was also revised to note that mowing of the swale in the public right of way of Stevens Street, in front of each lot, is encouraged to be performed by each lot owner. Should you have any questions concerning the attached or for the project, please feel free to contact us. Thank you. Sincerely, ANDOVER CONSULTANTS,INC. James S. Fairweather II, P.E. Project Engineer Enclosures cc Tom Patenaude 1992 3.18 4aa} `aZLS de.AdLa 05p �J — 0 0 - CD -V: H -r - o 77-- 1 CO 4 = o —_ --- --- __o = U _� �� M• _- _ _ 1` o0 to i .O L _ _ _ U IC V " LLI J s o CL z o N o - N a ,1 c° . 1 „ i i „ o LD 3 Ii s- U- Ui� _O O i O O N J _ Ui Uj J Q M 0 _ _ nc CD C�j O 1 U- 41 4J O d O w o M: � v b --y C 0 io 0 a v" Source: USDA-SCS Plate 3.18-3 III - 164 From/ Willis, Gene Sent: Wednesday, July 13. 2O11 10:52 AM /m: |ymon. JuUy Subject: 14O Academy Rd. @Stevens SL Judy | spoke wf Jim Fairweather about plans. My only comments are that the foundation drains must not tie into infiltrators and the culvert under driveway at lot 38 must be12' Eugene P.Willis P.E. North Andover Town Engineer 978-685-0950 Please note the Massachusetts Secretary of State's office has determined that most emails to and frorn municipal offices and officials are public records.For more Please consider the environment before printing misomai|. � � � 1 andover 1 East River Place consultants Methuen, Massachusetts 01844 inc. Tel. (978) 687-3828 Fax (978) 686-5100 www.andoverconsultants,com July 26, 2011 North Andover Planning Board Town Offices 1600 Osgood Street North Andover, MA 01845 n RE, : Land Disturbance Permit: 140 Academy Road at Stevens Street North Andover,MA OR T' ANDOVER Ladies and Gentlemen: --..PLANN�NG DEPART MEN 7' Enclosed please find attached: • Revised site design plan set, sheets 1, 2 ,3, 4, 5 and 6 of 6,prepared for Tom Patenaude, dated November 10, 2010., last revised 07-26-11, 4 copies. • "Erosion& Sediment Control Plan", prepared for Torn Patenaude, dated April 21, 2011, last revised 07-26-11, 4 copies. The attached plans were revised to incorporate the peer review comments contained in a letter to the North Andover Planning Board from Lisa Eggleston, PE of Eggleston Environmental, dated July 14, 2011. The revised plans include the following: Comment 1: The June 28, 2011 calculations indicate that the roadway in the vicinity of the existing culvert will still be overtopped under large storm (25-yr and greater) conditions, albeit to a lesser extent. Consideration should be given to using a larger pipe with capacity to convey the entire 25-yr storm flow. Response: We have not increased the size of the pipe in the current revision. We can certainly do so, but only if so conditioned by Town of North Andover town officials. Comment 2: The project will require an easement for the proposed work on private property, at the spillway outlet of the culvert that is being replaced. Response: Noted. The Applicant, Tom Patenaude, is in the process of obtaining the easement. Civil Engineers 9 Land Surveyors * Land Planners Comment 3: The proposed drop inlet should have a beehive grate, similar to the catch basin being replaced. Response: The drop inlet detail has been revised to require a beehive frame and grate, as suggested. Comment 4: A detail has been added to the plans showing weep holes in the retaining wall every 50 ft to allow groundwater through and relieve hydrostatic pressure. I do, however, still have concern that no vegetated drainage ways for the upgradient flows are provide, and that the grading is actually toward the house foundation and the driveways. Directing flows onto the driveways is not acceptable from a water quality or safety standpoint. Response: The grading behind the houses on lots 313, 4, 5 and 6 has been revised to provide swales to discharge any water flow from the weep holes around the dwellings and away from the driveway side. Comment 5: The O&M plan calls for the homeowners to keep the culverts clear of blockages, and they are likely to be motivated to do so. It may, however, be prudent to add trash racks on the upgradient sides of the culverts to prevent ports balls and the like from getting into the culverts. Response: We have not added trash racks to the inlet sides of the culverts. It is unlikely for the culverts to be blocked and it is possible that the grates would create more of a problem with blockages and hinder any maintenance work. Comment 6: The project entails disturbance of more than one acre of land and is therefore subject to the EPA's NPDES Phase II Construction General Permit. The Applicant has filed a Notice of Intent for coverage under the permit,and a Construction Stormwater Pollution Prevention Plan(SWPPP), dated April 21,2011, was included with the original application packet. The Construction SWPPP should be updated to reflect the recent revisions to the project design, and should also incorporate the Erosion & Sediment Control Criteria (Section 8.2) of the North Andover Stormwater and Erosion Control Regulations, as they include several specific requirements not spelled out in the SWPPP. Given the steep slopes and total area of disturbance proposed on the project site,I also recommend a pre- construction meeting with the contractor to discuss implementation of the erosion & sediment controls and encourage either the Planning Board or the Conservation Commission to consider requiring an independent Environmental Monitor for the project. Response: Just a clarification, we have prepared all the necessary documents for filing a Notice of Intent with the EPA,but we have not filed it yet. Upon approval, and prior to starting construction, the Notice of Intent will be submitted to the EPA, as required. The attached Erosion& Sediment Control Plan has been revised to reflect the latest grading and design, as suggested. Also, notes from the Section 8.2 have also been added to the plan to highlight construction requirements not depicted pictorially. The Applicant is working with his Contractor on a Phasing Plan and it will be submitted to the Planning Board prior to construction as required by Section 8.2 (and Note 8 on the attached plan). We agree that a pre-construction meeting is a good idea and defer to the Town's decision regarding an environmental monitor. In addition to the revisions noted above, we also revised the culvert under Lot 2B from an 8"ductile iron pipe to a 12" ductile iron pipe in response to a request from Town Engineer, Gene Willis. Should you have any questions concerning our revisions noted above, or require anything else, please feel free to contact us. Sincerely, ANDOVER CONSULTANTS,INC. ll� James S. Fairweather II, P.E. Project Engineer Enclosures cc Tom Patenaude TOWN OF NORTH ANDOVER [X VISION OF PUBI-IC WORKS 384 ()SGOOD SJUI,,"T IN4)1011 ANDOVER, MM)SACI WS[,"TTS 01845,2909 BRAX-T 11THMODI"AU, II.F. DIRECTOR Eugene P Willis, HS, PE I , Telqphone (M) 685-0950 Direcu�w ofEngineering fi'ax (97(�) 688-9573 August 26, 2011 North Andover Planning Board 1600 Osgood St. North Andover Re: Existing drainage culvert in Stevens Street. To whom it may concern, This letter is the verify the fact there was an existing 12" drainage culvert,crpssing Stevens St. approximately 450' north of the intersection with Great Pond Rd. This culver was replaced in s 2010 by DPW. Willis PE Si "I - ne P.own Engineer cc file C�d - andover 0 0,e n N f6ttr5,(1(fast River Place MetN.jen, MassachLisetts 01844 consultants Tel. (978) 68-7-3828 Fax (978) 686-5100 www.andovercons(,jltaiits,corn June 29, 2011 0 JA North Andover Planning Board r Town Offices f,jW 1600 Osgood Street North Andover, MA 0 1845 tl EAA RE Land Disturbance Permit: 140 Academy Road at Stevens Street North Andover, MA Ladies and Gentlemen: Enclosed please find attached: • Revised site design plan set, sheets 1, 2 3, 4, 5 and 6 of 6, prepared for Tom Patenaude, dated November 10, 20 10., last revised 06-27-11, 4 copies. • "Stormwater Report Supplement",prepared for Tom Patenaude, dated June 28, 2011, 4 copies. The attached plans were revised to incorporate several review comments given to us at a meeting, at the Planning Department,with Lisa Eggleston, Judy Tymon and Jennifer Hughes, on June 3, 2011 and at a second meeting with Judy, Jennifer and Gene Willis on June 14, 2011, also held at the Planning Department. The revised plans include the following: 1. The existing catch basin in front of Lot 2B is proposed to be replaced with a new structure that provides a four foot deep sediment sump. The existing sump is 21 inches deep 2. The excavated area at the existing basin has been enlarged to provide more temporary stormwater storage. A 10 scale detail of this area has been added to the plans. 3. The flat basin grate is proposed to be replaced with a beehive grate to minimize possible clogging of the grate. 4. A vented oil and debris trap ("Snout" as manufactured by Best Management Products, Inc.) is proposed to be installed on the catch basin to contain oil and debris from discharging to the existing drainage system. The existing basin does not have this feature. Civil Engineers @ L.and Surveyors * Land Planners 5. A small pea stone berm is proposed to be placed just downstream of the driveway at Lot 2B to serve as a sediment trap to intercept suspended solids from the Lot 2B drive, 6. A bituminous concrete berm has been added to each driveway to divert runoff from most of the driveway directly into the proposed swale along Stevens Street. 7. Each driveway cross slope has been revised to 2.25%to pitch to a 6-inch deep swale constructed along the edge of each drive. 8. A typical detail of the retaining wall drain outlet has been added to the plans, see sheet 6 of 6. 9. Corrected the outlet elevation of the existing culvert in front of Lot 5 and provided additional topographic information downstream of the existing culvert. 10. Provided a"Snout" oil and debris trap for the pipe outlet in the proposed drop inlet structure, as was done for the existing basin at Lot 2B. 11. The slope on the lowered culvert has been revised to 2%, at the request of Gene Willis. 12. A rip rap apron has been added to the outlet end to mitigate outlet velocity. The riprap basin was sized using USDA-SCS Nomograph for a round pipe flowing full with minimum tail water condition. Nomograph is attached. The stormwater reportsupplement was revised to update the calculations per the relevant revisions noted above. The Operation and maintenance portion was also revised to note that mowing of the swale in the public right of way of Stevens Street, in front of each lot, is encouraged to be performed by each lot owner. Should you have any questions concerning the attached or for the project, please feel free to contact us. Thank you. Sincerely, ANDOVER CONSULTANTS, INC. j IZ-= James S. Fairweather 11, P.E. Project Engineer Enclosures cc Tom Patenaude 1992 3.18 Q � E ;aaJ `azig deadiU 05p �J m N + O O CD —_\\ — - 1. —_F._ _ j N ,o 1 m � Iii O o w _ ' o °J v O _ LO L ea u C) �o CL U- ' 6 J C3 Ln ¢o o° f v n V - 1�`p\6 lei.~.� 3 4� O O �--• N J M 1 I..L) O O O LLJ J Q M O 1 G a-1 O J .. N C> L 1 o It °/ ar E z � ±, aro t- c c� oao Ui C3£ 1 y )I � av Source: USDA-SCS Plate 3.18-3 III - 164 andover 1 East Rivei, Place D1 Methuen, Massachusetts 01 8 44 inc. -161. (9-78) 687-3828 Fax (978) 686-5100 wwwandovercousultmts,corri July 26, 2011 North Andover Planning Board OR Town Offices 1600 Osgood Street North Andover, MA 01845 Alt. 7 '1 N�CORTFI ANDOVER E-A DEPARTMENT TM NI' RE, Land Disturbance Permit: PLAINMNG DEPARTMENT 140 Academy Road at Stevens Street North Andover, MA Ladies and Gentlemen: Enclosed please find attached: • Revised site design plan set, sheets 1, 2 3, 4, 5 and 6 of 6, prepared for Tom Patenaude, dated November 10, 2010., last revised 07-26-11, 4 copies. • "Erosion& Sediment Control Plan", prepared for Tom Patenaude, dated April 21, 2011, last revised 07•26-11, 4 copies. The attached plans were revised to incorporate the peer review comments contained in a letter to the North Andover Planning Board from Lisa Eggleston, PE of Eggleston Environmental, dated July 14, 2011. The revised plans include the following: Comment 1: The June 28, 2011 calculations indicate that the roadway in the vicinity of the existing culvert will still be overtopped under large storm (25-yr and greater) conditions, albeit to a lesser extent. Consideration should be given to using a larger pipe with capacity to convey the entire 25-yr storm flow. Response: We have not increased the size of the pipe in the current revision. We can certainly do so, but only if so conditioned by Town of North Andover town officials. Comment 2: The project will require an easement for the proposed work on private property, at the spillway outlet of the culvert that is being replaced. Response: Noted. The Applicant, Tom Patenaude, is in the process of obtaining the easement. Civil Engineers - Land Surveyors @ Land Planners Comment 3: The proposed drop inlet should have a beehive grate, similar to the catch basin being replaced. Response: The drop inlet detail has been revised to require a beehive frame and grate, as suggested. Comment 4: A detail has been added to the plans showing weep holes in the retaining wall every 50 ft to allow groundwater through and relieve hydrostatic pressure. I do, however, still have concern that no vegetated drainage ways for the upgradient flows are provide, and that the grading is actually toward the house foundation and the driveways. Directing flows onto the driveways is not acceptable from a water quality or safety standpoint. Response: The grading behind the houses on lots 313, 4, 5 and 6 has been revised to provide swales to discharge any water flow from the weep holes around the dwellings and away from the driveway side. Comment 5: The O&M plan calls for the homeowners to keep the culverts clear of blockages, and they are likely to be motivated to do so. It may, however, be prudent to add trash racks on the upgradient sides of the culverts to prevent ports balls and the like from getting into the culverts. Response: We have not added trash racks to the inlet sides of the culverts. It is unlikely for the culverts to be blocked and it is possible that the grates would create more of a problem with blockages and hinder any maintenance work. Comment 6: The project entails disturbance of more than one acre of land and is therefore subject to the EPA's NPDES Phase II Construction General Permit. The Applicant has filed a Notice of Intent for coverage under the permit, and a Construction Stormwater Pollution Prevention Plan (SWPPP), dated April 21,2011, was included with the original application packet. The Construction SWPPP should be updated to reflect the recent revisions to the project design, and should also incorporate the Erosion & Sediment Control Criteria (Section 8.2) of the North Andover Stormwater and Erosion Control Regulations, as they include several specific requirements not spelled out in the SWPPP. Given the steep slopes and total area of disturbance proposed on the project site,I also recommend a pre- construction meeting with the contractor to discuss implementation of the erosion & sediment controls and encourage either the Planning Board or the Conservation Commission to consider requiring an independent Environmental Monitor for the project. Response: Just a clarification, we have prepared all the necessary documents for filing a Notice of Intent with the EPA, but we have not filed it yet. Upon approval, and prior to starting construction,the Notice of Intent will be submitted to the EPA, as required. The attached Erosion& Sediment Control Plan has been revised to reflect the latest grading and design, as suggested. Also, notes from the Section 8.2 have also been added to the plan to highlight construction requirements not depicted pictorially. The Applicant is working with his Contractor on a Phasing Plan and it will be submitted to the Planning Board prior to construction as required by Section 8.2 (and Note 8 on the attached plan). We agree that a pre-construction meeting is a good idea and defer to the Town's decision regarding an environmental monitor. In addition to the revisions noted above, we also revised the culvert under Lot 2B from an 8" ductile iron pipe to a 12" ductile iron pipe in response to a request from Town Engineer, Gene Willis. Should you have any questions concerning our revisions noted above, or require anything else,please feel free to contact us. Sincerely, ANDOVER CONSULTANTS,INC. James S. Fairweather 11, P.E. Project Engineer Enclosures cc Tom Patenaude andover 1 East River Place onsultants Methuen, Massachusetts 01844 inc. Tel, (978) 687-3828 Fax (978) 686-5100 www.andoverconsultants.com September 8,2011 North Andover Conservation Commission Town Offices 1600 Osgood Street North Andover,MA 01845 RE: Notice of Intent DEP File No 242-1504 140 Academy Road at Stevens Street North Andover,MA Ladies and Gentlemen: Enclosed please find attached: 0 2 copies of 24"x 36"revised site design plans, sheets 1,2, 3, 4, 5 and 6 of 6,prepared for Tom Patenaude, last revised 09-01-11. 0 7 copies of 11"x 17"plans noted above. • A check in the amount of$200.00 made out to the Town of North Andover. The attached plans are submitted to request a minor modification to the Order of Conditions issued for the project. The attached plans show a new location for the larger 18-inch culvert 30 feet northerly of the originally approved location. This move was requested by the property owner who will be granting the easement. Per the request of Gene Willis, Town Engineer,the existing 12-inch culvert will remain. Should you require any additional information, or have any questions concerning the project, please feel free to contact us. Thank you. Sincerely, ANDOVER CONSULTANTS,INC. James S.Fairweather 11,P.E. Project Engineer Enclosures cc Tom Patenaude Civil Engineers @ Land Surveyors Land Planners F w I / ! 1 r I II i_ ! M I I � % l I I I 1 ✓ I yS 1 I 1 I 1 1 IA , I \ 1 C � I \ 1 \I I • c� Ni ZzD � 1 I M G) ` m°�A r*m D--4i z b N C C i � �°off onea 5�m t r QN;m Jr ° a° �z - I Jul rn u it i i li ill JJ 0 I n�° rn� I he g x o r z 11 I it so mm No o I II z, a 1 u N n Vim° iocFm .I 102° II 1 r > rimA°"o"°� • I I i �� r It 1 I 1 ++ •' V 1 � , Hui Fq fi E III III• } I I i L I ': �' 1 , o� RAN ° o 0wa HIS m p ' o^ ........� <n gFE� " " I r o� mmmmm -'-- — y ' I Stevens St dev 06-09-11 Type ///24-hr 100-Yr Rainfall=8.60" Prepared by Andover Consultants, Inc. HydroCAD®8.00 s/n 002099 ©2006 HydroCAD Software Solutions LLC Pond 5P: renovated culvert Inflow Area = 4.716 ac, Inflow Depth > 5.34" for 100-Yr event Inflow = 26.8 cfs @ 12.12 hrs, Volume= 2.098 of Outflow = 26.0 cfs @ 12.13 hrs, Volume= 2.104 af, Atten= 3%, Lag= 0.7 min Primary = 7.6 cfs @ 12.13 hrs, Volume= 1.736 of Secondary = 18.5 cfs @ 12.13 hrs, Volume= 0.368 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs/3 Peak Elev= 171.28' @ 12.13 hrs Surf.Area= 5,209 sf Storage=4,325 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 1.7 min (818.6- 816.8) Volume Invert Avail.Storage Storage Description #1 166.75' 4,433 cf Custom Stage Data(Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 166.75 13 0 0 167.00 13 3 3 168.00 13 13 16 169.00 250 132 148 170.00 870 560 708 171.00 3,815 2,343 3,050 171.10 4,410 411 3,461 171.30 5,300 971 4,433 Device Routing Invert Outlet Devices #1 Primary 166.75' 12.0" x 36.0' long Culvert RCP, square edge headwall, Ke= 0.500 Outlet Invert= 166.03' S= 0.0200 'P Cc= 0.900 n= 0.011 #2 Secondary 171.10' 95.0' long x 2.0' 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 3.50 Coef. (English) 2.54 2.61 2.61 2.60 2.66 2.70 2.77 2.89 2.88 2.85 3.07 3.20 3.32 Primary OutFlow Max=7.6 cfs @ 12.13 hrs HW=171.28' (Free Discharge) t-1=Culvert (Inlet Controls 7.6 cfs @ 9.66 fps) Secondary OutFlow Max=17.8 cfs @ 12.13 hrs HW=171.28' (Free Discharge) 2=Broad-Crested Rectangular Weir (Weir Controls 17.8 cfs @ 1.07 fps)