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HomeMy WebLinkAbout20160105 Application/WSP modification - Application - 254 GREAT POND ROAD 3/18/2016 Print Form O ti.4ev eA gyp € i r$i b )(a AI AAA Tt9�rQA`r�� rS6i PLANNING DEPARTMENT Community Development Division Special Permit— Watershed Permit Application Please type or print clearly. 1. Petitioner: Thomas and Nicole Friel Petitioner's Address 254 Great Pond Road_, North Andover, MA 0184.5_ Telephone number: 617-548-3724 2.Owners of the Land: Same As Petitioner Address: 254 Great Pond Road North Andover, MA 01845 Number of years of ownership: < 1 month 3.Year lot was created:2010 4. Is the lot currently on septic or sewer? yes If on sewer,please provide date the sewer connection was completed:On Sewer...connected in 2006 5. Description of Proposed Project: Owner is proposing to add a small addition off of the existing garage within the 250 foot"Non-Disturbance" buffer zone. but outside the 150 foot"Conservation" buffer zone The owner is also seeking to extend the existing porch to provide handicap access. 6.Description of Premises:Sloping developed lot improved with a single family house 7,Address of Property Being Affected:254 Great Pond Road Zoning District: R1 Assessors Map: 37A Lot#:6 Registry of Deeds: Book#:-Pending page#: Pending 8. Existing Lot: Lot Area(Sq.Ft): 89,627 Building Height: < 35 feet Street Frontage:512.29 Side Setbacks> 30 feet Front Setback:26.4 feet Rear Setback:> 30 feet Floor Area Ratio: n/a Lot Coverage: n/a 9. Proposed Lot(if applicable): Lot Area(Sq. Ft): Building Height: Street Frontage: Side Setbacks: Page 1 of 2 1600 Osgood Street, North Andover, Bldg.20, Suite 2-36 Planning Dept,, Massachusetts 01845 Phone 978.688,9535 Fax 978,688,9542 Web www.townofnorthandover.com Edited 8/6/07 Front Setback: Rear Setback: Floor Area Ratio: Lot Coverage: 10.Required Lot(as required by Zoning Bylaw): Lot Area(Sq. Ft): 87,120 Building Height:35 foot max Street Frontage: 175 feet Side Setbacks:30 feet Front Setback:30 feet Rear Setback:30 feet Floor Area Ratio: n/a Lot Coverage: n/a 11.Existing Building(if applicable): Ground Floor(Sq. Ft.): #of Floors:2 Total S.F.:5,461 Height: < 35 feet Use:Single Family Type of Construction:Wood Frame 12.Proposed Building: Ground Floor(Sq. Ft.): #of Floors:2 Total Sq. Ft:1,179 Height: < 24 feet Use: Single Family Type of Construction:Wood Frame 13.Has there been a previous application for a Special Permit from the Planning Board on these premises?yes If so,when and for what type of construction? 22'x23'addition 14.Section of Zoning Bylaw that Special Permit Is Being Requested 4.136(3)(c)(ii) (6) 15. Petitioner and Landowner signature(s): Every application for a Special Permit shall be made on this form, which is the official form of the Planning Board. Every application shall be filed with the Town Clerk's office, It shall be the responsibility of the petitioner to furnish all supporting documentation with this application. The dated copy of this application received by the Town Clerk or Planning Office does not absolve the applicant from this responsibility.The petitioner shall be responsible for all expenses for filing and legal notification. Failure to comply with application requirements, as cited herein and in the Planning Board Rules and Regulations may result in a dismissal by the Planning Board of this application as incomplete. , Petitioner's Signature: (�'` ""� �'+ V �1•�-C� Print or type name here: Nicole Friel Owner's Signature: Print or type name here: Nicole Friel 16.Please list title of plans and documents you will be attaching to this application. Site Plan of Land prepared by Sullivan Engineering Group, LLC; Drywell Sizing (HydroCAD); Page 2 of 2 1600 Osgood Street North Andover Bldg 20 Suite 2-36 Planning Dept Massachusetts 01845 Phone 978.688.9535 Fax 978.688,9542 Web www,townofnorthandover.com Edited 816107 Sullivan Engineering Group, LLC Cii4l Engineeis S Land Development Consultants March 17, 2016 Town of North Andover Planning Board Re: 254 Great Pond Road, North Andover Request for Minor Modification of Watershed Special Permit To Whom It May Concern: The owner and applicant, Thomas &Nicole Friel, of 254 Great Pond Road, North Andover is requesting a minor modification to the recently approved Watershed Special Permit. In reviewing their family situation and after discussions with builders, the Friel's are requesting to construct a small addition off of the existing garage footprint to allow internal handicap access to the main dwelling structure. The garage will remain a 2 car garage and a second floor will be added above the garage area. The addition (labeled Addition#2) on the plan has a footprint of 309 square feet. In order to mitigate the impact of the increased impervious area with this addition and the extension of the existing roofed side porch (I 10 s.f,) for handicap access means, a second drywell (drywell#2) is proposed to capture 435 square feet of the garage roofed area. HydroCAD drainage calculations are attached supporting the design of Drywell #2. If you should have any questions or comments please feel free to contact me. Very Truly Yours, Digitally signed by John Sullivan John DN:cn=John Sullivan,o,ou, email=jacksu1153�comcas Lnet, Sullivan Date:2016.03.1712W:13-04'00' John (Jack)D. Sullivan III, PE PO Box 2004 Woburn, MA 01888 (781)854-8644 email:jacksu1153@comcast.net 1 2 Roof Area to Drywell #1 Roof Area to Drywell #2 1 2P\ 500 Gallon Drywell#1 w/ 500 Gallon Drywell#2 w/ 12" Stone Surrounding 12" Stone Surrounding Subcat Reach on Link Drainage Diagram for 254 Great Pond Road Prepared by{enter your company name here} 3/17/2016 HydroCADO 7.00 s/n 001433 ©1986-2003 Applied Microcomputer Systems 254 Great Pond Road Type 111 24-hr 2 yr Rainfall=3.12" Prepared by{enter your company name here} Page 2 HydroCADO 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 3/17/2016 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Roof Area to Drywell #1 Runoff Area=506 sf Runoff Depth=2.70" Tc=6.0 min CN=98 Runoff=0.03 cfs 114 cf Subcatchment 2S: Roof Area to Drywell #2 Runoff Area=435 sf Runoff Depth=2.70" Tc=6.0 min CN=98 Runoff=0.03 cfs 98 cf Pond 1P: 500 Gallon Drywell#1 w/ 12" Stone SurrPeak Elev=136.45' Storage=27 cf Inflow=0.03 cfs 114 cf Outflow=0.01 cfs 114 cf Pond 2P: 500 Gallon Drywell#2 w/ 12" Stone SurroPeak Elev=138.02' Storage=21 cf Inflow=0.03 cfs 98 cf Outflow=0.01 cfs 98 cf Total Runoff Area = 941 sf Runoff Volume = 212 cf Average Runoff Depth = 2.70" 254 Great Pond Road Type 111 24-hr 2 yr Rainfall=3.12" Prepared by {enter your company name here} Page 3 HydroCADO 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 3/17/2016 Subcatchment 1S: Roof Area to Drywell #1 Runoff = 0.03 cfs @ 12.09 hrs, Volume= 114 cf, Depth= 2.70" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2 yr Rainfall=3.12" Area (so CN Description 506 98 Roof Area to Drywell Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, From Roof Subcatchment 1S: Roof Area to Drywell #1 Hydrograph 0.038-" ❑Runoff 0.03s 0.03 cfs 0.034 0.032 Type. III 24-hr 2 yr -: 0.03 Rainfall=3.12" 0.026 0.026 Runoff Area=506 sf 0.024 Runoff Volume=114 cf 0.022 0 0 0�8. 3 = RunoffDepth=2.70" U. 0.016 ' 0.014' Tc=6.0 min 0.012= CN=98 0.01 i 0.008 0.006-: 0.004: 0.002=" 0 5 6 7 8 9 10 11 1'2 13 14 15 16 17 18 19 20 Time (hours) 254 Great Pond Road Type 111 24-hr 2 yr Rainfall=3.12" Prepared by {enter your company name here} Page 4 HydroCAD®7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 3/17/2016 Subcatchment 2S: Roof Area to Drywell #2 Runoff = 0.03 cfs @ 12.09 hrs, Volume= 98 cf, Depth= 2.70" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 2 yr Rainfall=3.12" Area (so CN Description 435 98 Roof Area to Drywell Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, From Roof Subcatchment 2S: Roof Area to Drywell #2 Hydrograph 0.032 O Runoff 0.03 cfs 0.03- 0.028_ Type III 24-hr 2 yr 0.026= Rai nfal l=3.12" 0.024= 0.022? Runoff Area=435 sf 0.02= — _0.018= Runoff Volume=98 of c 0.016= Runoff Depth=2.70" u 0.014 0.012= TC=6.0 m l n 0.01 CN=98 0.008 0.006 0.004 0.002 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 254 Great Pond Road Type 111 24-hr 2 yr Rainfall=3.12" Prepared by {enter your company name here} Page 5 HydroCAD®7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 3/17/2016 Pond 1 P: 500 Gallon Drywell#1 w/ 12" Stone Surrounding Field Percolation Rate of Soil = 12 MPI Inflow Area = 506 sf, Inflow Depth = 2.70" for 2 yr event Inflow = 0.03 cfs @ 12.09 hrs, Volume= 114 cf Outflow = 0.01 cfs @ 11.75 hrs, Volume= 114 cf, Atten= 78%, Lag= 0.0 min Discarded = 0.01 cfs @ 11.75 hrs, Volume= 114 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 136.45' @ 12.50 hrs Surf.Area=64 sf Storage= 27 cf Plug-Flow detention time= 20.6 min calculated for 113 cf(100% of inflow) Center-of-Mass det. time= 20.2 min ( 759.0 - 738.8 ) # Invert Avail.Storage Storage Description 1 135.40' 76 cf 8.00'W x 8.001 x 4.00'H Prismatoid 256 cf Overall -67 cf Embedded = 189 cf x 40.0% Voids 2 136.40' 67_cf 5.33'D x 3.00'H Vertical Cone/Cylinder Inside#1 143 cf Total Available Storage # Routing Invert Outlet Devices 1 Discarded 0.00' 0.006944 fpm Exfiltration over entire Surface area Qiscarded OutFlow Max=0.01 cfs @ 11.75 hrs HW=135.45' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.01 cfs) Pond 1 P: 500 Gallon Drywell#1 w/ 12" Stone Surrounding Hydrograph 0.038: ' 0.03 cfs [:] inflow Discarded 0.036. Inflow Area= 06 sf 0.034 0.032 003_ , Peak Elev=136.45" 0.028 0.026= Storage=27 d 0.024_ 0.022= 0.02= 0 0.018 n. 0.016 0.014 0.012 0.01- 0.01 cfs . 0.008= 0.006= 0.004= . ., r 0.002; '. 0' 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 254 Great Pond Road Type 111 24-hr 2 yr Rainfall=3.12" Prepared by {enter your company name here) Page 6 HydroCAD®7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 3/17/2016 Pond 2P: 500 Gallon Drywell#2 w/ 12" Stone Surrounding Field Percolation Rate of Soil = 12 MPI Inflow Area = 435 sf, Inflow Depth = 2.70" for 2 yr event Inflow = 0.03 cfs @ 12.09 hrs, Volume= 98 cf Outflow = 0.01 cfs @ 11.80 hrs, Volume= 98 cf, Atten= 75%, Lag= 0.0 min Discarded = 0.01 cfs @ 11.80 hrs, Volume= 98 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 138.02' @ 12.46 hrs Surf.Area= 64 sf Storage= 21 cf Plug-Flow detention time= 15.2 min calculated for 98 cf(100% of inflow) Center-of-Mass det. time= 14.8 min ( 753.6 -738.8 ) # Invert Avail.Storage Storage Description 1 137.20' 76 cf 8.00'W x 8.00'L x 4.00'H Prismatoid 256 cf Overall -67 cf Embedded = 189 cf x 40.0%Voids 2 138.20' 67 cf 5.33'D x 3.00'H Vertical Cone/Cylinder Inside#1 143 cf Total Available Storage # Routing Invert Outlet Devices 1 Discarded 0.00' 0.006944 fpm Exfiltration over entire Surface area Discarded OutFlow Max=0.01 cfs @ 11.80 hrs HW=137.25' (Free Discharge) t1=Exfiltration (Exfiltration Controls 0.01 cfs) Pond 2P: 500 Gallon Drywell#2 w/ 12" Stone Surrounding Hydrograph L7 inw, 0.032 0.03 Cfs p Discarded 0.03� Inflow Area=435 sf 0.026=0.026= Peak Iev=138.02' 0.024: 0.022. Storage=21 d 0.02- 0.018 ' 3 0.016=" 0 u 0.014 0.012 i 0.01 0.01 cfs 0.006 0.006- 0.004: 0.002 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 254 Great Pond Road Type /// 24-hr 10 yr Rainfall=4.94" Prepared by {enter your company name here} Page 7 HydroCADO 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 3/17/2016 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Roof Area to Drywell #1 Runoff Area=506 sf Runoff Depth=4.36" Tc=6.0 min CN=98 Runoff=0.05 cfs 184 cf Subcatchment 2S: Roof Area to Drywell #2 Runoff Area=435 sf Runoff Depth=4.36" Tc=6.0 min CN=98 Runoff=0.05 cfs 158 cf Pond 1P: 500 Gallon Drywell#1 w/ 12" Stone SurrPeak Elev=137.22' Storage=58 cf Inflow=0.05 cfs 184 cf Outflow=0.01 cfs 184 cf Pond 2P: 500 Gallon Drywell#2 w/ 12" Stone SurrPeak Elev=138.72' Storage=46 cf Inflow=0.05 cfs 158 cf Outflow=0.01 cfs 158 cf Total Runoff Area = 941 sf Runoff Volume = 342 cf Average Runoff Depth = 4.36" 254 Great Pond Road Type H/ 24-hr 10 yr Rainfall=4.94" Prepared by {enter your company name here} Page 8 HydroCADO 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 3/17/2016 Subcatchment 1S: Roof Area to Drywell #1 Runoff = 0.05 cfs @ 12.09 hrs, Volume-- 184 cf, Depth= 4.36" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5,00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10 yr Rainfall=4.94" Area (so CN Description 506 98 Roof Area to Drywell Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, From Roof Subcatchment 1S: Roof Area to Drywell #1 Hydrograph 0.06= p Runoff 0.05 cfs 0.055 Type III 24-h r 10 yr 005- Rainfall=4.94" 0.045- Runoff Area=506 sf 0.04- Runoff Volume=184 'cf 0.035- 3 0.03: Runoff Depth=4.36 u 0.025 Tc=6.0 m i n 0.02- CN=98 0.015 0.01- 0.005- 0- . 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 254 Great Pond Road Type /// 24-hr 10 yr Rainfall=4.94" Prepared by {enter your company name here} Page 9 HydroCADO 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 3/17/2016 Subcatchment 2S: Roof Area to Drywell #2 Runoff = 0.05 cfs @ 12.09 hrs, Volume= 158 cf, Depth= 4.36" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 10 yr Rainfall=4.94" Area (so CN Description 435 98 Roof Area to Drywell Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, From Roof Subcatchment 2S: Roof Area to Drywell #2 Hydrograph 0.052 ❑Runoff 0.05 0.05 cfs 0.048-1 0.046- Type III 24-hr 10 yr 0.044- 0 .04 0.04 Rai nfal l=4.94" .04< 0.038, 0.036 Runoff Area=435 sf 0.034= 0.032 Runoff Volume=158 d 0.03' 3 0:026 Runoff Depth=4.36" 0 0.024 u 0.022; Tc=6.0 min 0.02 0.018 0.01 CN=98 6•: 0.014=, 0.012= 0.01= 0.008< 0.006= 0.004 0.002= 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 254 Great Pond Road Type I1124-hr 10 yr Rainfall=4.94" Prepared by {enter your company name here} Page 10 HydroCAD®7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 3/17/2016 Pond 1P: 500 Gallon Drywell#1 w/ 12" Stone Surrounding Field Percolation Rate of Soil = 12 MPI Inflow Area = 506 sf, Inflow Depth = 4.36" for 10 yr event Inflow = 0.05 cfs @ 12.09 hrs, Volume= 184 cf Outflow = 0.01 cfs @ 11.65 hrs, Volume= 184 cf, Atten= 86%, Lag= 0.0 min Discarded = 0.01 cfs @ 11.65 hrs, Volume= 184 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 137.22' @ 12.61 hrs Surf.Area= 64 sf Storage= 58 cf Plug-Flow detention time= 50.1 min calculated for 183 cf(100% of inflow) Center-of-Mass det. time= 49.5 min ( 784.7 - 735.2 ) # Invert Avail.Storage Storage Description 1 135.40' 76 cf 8.00'W x 8.00'L x 4.00'H Prismatoid 256 cf Overall -67 cf Embedded = 189 cf x 40.0% Voids 2 136.40' 67 cf 5.33'D x 3.00'H Vertical Cone/Cylinder Inside#1 143 cf Total Available Storage # Routing Invert Outlet Devices 1 Discarded 0.00' 0.006944 fpm Exfiltration over entire Surface area Discarded OutFlow Max=0.01 cfs @ 11.65 hrs HW=135.45' (Free Discharge) L1=Exfiltration (Exfiltration Controls 0.01 cfs) Pond 1 P: 500 Gallon Drywell#1 w/ 12" Stone Surrounding Hydrograph Inflow 0.06, 0.05 CfS p Discarded 0.055= Inflow Area= 06 sf 0.05- Peak lev=137.22' 0.045 Storage=58 cf 0.04- w 0.035 M1 o 3 0.03- o 0.025 0.02- 0.015- 0.01 0.01 cfs 0.005- 0- ' 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 254 Great Pond Road Type 11124-hr 10 yr Rainfall=4.94" Prepared by{enter your company name here} Page 11 HydroCADO 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 3/17/2016 Pond 2P: 500 Gallon Drywell#2 w/ 12" Stone Surrounding Field Percolation Rate of Soil = 12 MPI Inflow Area = 435 sf, Inflow Depth = 4.36" for 10 yr event Inflow = 0.05 cfs @ 12.09 hrs, Volume= 158 cf Outflow = 0.01 cfs @ 11.70 hrs, Volume= 158 cf, Atten= 84%, Lag= 0.0 min Discarded = 0.01 cfs @ 11.70 hrs, Volume= 158 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 138.72' @ 12.57 hrs Surf.Area=64 sf Storage=46 cf Plug-Flow detention time= 37.7 min calculated for 158 cf(100% of inflow) Center-of-Mass det. time= 37.2 min ( 772.4 - 735.2 ) # Invert Avail.Storage Storage Description 1 137.20' 76 cf 8.00'W x 8.00'L x 4.00'H Prismatoid 256 cf Overall -67 cf Embedded = 189 cf x 40.0%Voids 2 138.20' 67 cf 5.33'D x 3.00'H Vertical Cone/Cylinder Inside#1 143 cf Total Available Storage # Routing Invert Outlet Devices 1 Discarded 0.00' 0.006944 fpm Exfiltration over entire Surface area Discarded OutFlow Max=0.01 cfs @ 11.70 hrs HW=137.25' (Free Discharge) L1=Exfiltration (Exfiltration Controls 0.01 cfs) Pond 2P: 500 Gallon Drywell#2 w/ 12" Stone Surrounding Hydrograph Ei Inflow 0.05 CfS El Discarded 0.05, Inflow Area=435 sf 0.045- Peak lev=138.72' 0.04- Storage=46 cf 0.035- 0.03- o _ 0 0.025-" LL 0.02- 0.015- 0.01 0.01 cfs 0.005- 0- - ' 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 254 Great Pond Road Type/1/ 24-hr 100 yr Rainfall=7.83" Prepared by {enter your company name here} Page 12 HydroCADO 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 3/17/2016 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: Roof Area to Drywell #1 Runoff Area=506 sf Runoff Depth=6.99" Tc=6.0 min CN=98 Runoff=0.09 cfs 295 cf Subcatchment 2S: Roof Area to Drywell #2 Runoff Area=435 sf Runoff Depth=6.99" Tc=6.0 min CN=98 Runoff=0.07 cfs 253 cf Pond 1P: 500 Gallon Drywell#1 w/ 12" Stone Su Peak Elev=138.63' Storage=112 cf Inflow=0.09 cfs 295 cf Outflow=0.01 cfs 295 cf Pond 2P: 500 Gallon Drywell#2 w/ 12" Stone SurrPeak Elev=139.86' Storage=90 cf Inflow=0.07 cfs 253 cf Outflow=0.01 cfs 253 cf Total Runoff Area = 941 sf Runoff Volume = 548 cf Average Runoff Depth = 6.99" 254 Great Pond Road Type/1/ 24-hr 100 yr Rainfall=7.83" Prepared by {enter your company name here} Page 13 HydroCADO 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 3/17/2016 Subcatchment 1S: Roof Area to Drywell #1 Runoff = 0.09 cfs @ 12.09 hrs, Volume= 295 cf, Depth= 6.99" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100 yr Rainfall=7.83" Area (so CN Description 506 98 Roof Area to Drywell Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, From Roof Subcatchment 1S: Roof Area to Drywell #1 Hydrograph 0.095= ❑Runoff 0.09= 0.09 cfs 0.085- Type III 24-h r 100 yr 0 08 0.075 Rainfall=7.83" 0.0655 Runoff Area=506 sf Runoff Volume=295 cf w 0.055- °.05 Runoff Depth=6.99" 0 0.045. U. Tc=6.0 min0.04 0.035 0.03_ CN-98 0.025<' 0.015 0.01= 0.005- 0' 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 254 Great Pond Road Type 111 24-hr 100 yr Rainfall=7.83" Prepared by {enter your company name here} Page 14 HydroCADO 7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 3/17/2016 Subcatchment 2S: Roof Area to Drywell #2 Runoff = 0.07 cfs @ 12.09 hrs, Volume= 253 cf, Depth= 6.99" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type III 24-hr 100 yr Rainfall=7.83" Area (sf) CN Description 435 98 Roof Area to Drywell Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, From Roof Subcatchment 2S: Roof Area to Drywell #2 Hydrograph 0.08= 0.07 cfs ❑Runoff 0.075 Type III 24-h r 100 yr 0.07 0.065- Rainfall=7.83" 0.06- Runoff Area=435sf 0.055-: ,. 0.05 Runoff Volume=253 cf N 0.045_ Runoff Depth=6.99" c 0.04= 0.035=' Tc=6.0 i11In 0.03:" C N=98 0.025 0.02 0.015=' 0.01=" 0.005.' 0= 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 254 Great Pond Road Type/1/ 24-hr 100 yr Rainfall=7.83" Prepared by {enter your company name here} Page 15 HydroCAD®7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 3/17/2016 Pond 1 P: 500 Gallon Drywell#1 w/ 12" Stone Surrounding Field Percolation Rate of Soil = 12 MPI Inflow Area = 506 sf, Inflow Depth = 6.99" for 100 yr event Inflow = 0.09 cfs @ 12.09 hrs, Volume= 295 cf Outflow = 0.01 cfs @ 11.25 hrs, Volume= 295 cf, Atten= 92%, Lag= 0.0 min Discarded = 0.01 cfs @ 11.25 hrs, Volume= 295 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 138.63' @ 13.01 hrs Surf.Area= 64 sf Storage= 112 cf Plug-Flow detention time= 114.2 min calculated for 295 cf(100% of inflow) Center-of-Mass det. time= 113.7 min ( 846.8 - 733.1 ) # Invert Avail.Storage Storage Description 1 135.40' 76 cf 8.00'W x 8.001 x 4.00'H Prismatoid 256 cf Overall -67 cf Embedded = 189 cf x 40.0% Voids 2 136.40' 67 cf 5.33'D x 3.00'H Vertical Cone/Cylinder Inside#1 143 cf Total Available Storage # Routing Invert Outlet Devices 1 Discarded 0.00' 0.006944 fpm Exfiltration over entire Surface area Qiscarded OutFlow Max=0.01 cfs @ 11.25 hrs HW=135.44' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.01 cfs) Pond 1P: 500 Gallon Drywell#1 w/ 12" Stone Surrounding Hydrograph d Inflow 0.095E 0.09 CfS El Discarded 0.09 Inflow Area= 06 sf 0.085 0075 Peak lev=13 .63' 0.07-0.065 Storage=11 cf '" 0.06=, w 0.055= 0.05= o 0.045 0.04c 0.035= 0.03=" 0.025 0.02 0.015_ " 0.01 cfs 0.01 0.005= 0- . 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 254 Great Pond Road Type 111 24-hr 100 yr Rainfall=7.83" Prepared by {enter your company name here} Page 16 HydroCAD®7.00 s/n 001433 © 1986-2003 Applied Microcomputer Systems 3/17/2016 Pond 2P: 500 Gallon Drywell#2 w/ 12" Stone Surrounding Field Percolation Rate of Soil = 12 MPI Inflow Area = 435 sf, Inflow Depth = 6.99" for 100 yr event Inflow = 0.07 cfs @ 12.09 hrs, Volume= 253 cf Outflow = 0.01 cfs @ 11.40 hrs, Volume= 253 cf, Atten= 90%, Lag= 0.0 min Discarded = 0.01 cfs @ 11.40 hrs, Volume= 253 cf Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 139.86' @ 12.86 hrs Surf.Area= 64 sf Storage= 90 cf Plug-Flow detention time= 87.6 min calculated for 252 cf(100% of inflow) Center-of-Mass det. time= 86.9 min ( 820.0 - 733.1 ) # Invert Avail.Storage Storage Description 1 137.20' 76 cf 8.00'W x 8.00'L x 4.00'H Prismatoid 256 cf Overall -67 cf Embedded = 189 cf x 40.0% Voids 2 138.20' 67 cf 5.33'D x 3.00'H Vertical Cone/Cylinder Inside#1 143 cf Total Available Storage # Routing Invert Outlet Devices 1 Discarded 0.00' 0.006944 fpm Exfiltration over entire Surface area Qiscarded OutFlow Max=0.01 cfs @ 11.40 hrs HW=137.24' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.01 cfs) Pond 2P: 500 Gallon Drywell#2 w/ 12" Stone Surrounding Hydrograph O Inflow 0.07 cfs 0.08 p Discarded 0.075= Inflow Area=435 sf 007_0.065 Peakle; v=139.86' 006� Storage=90 cf 0.055T 0.05= 0.045' a 0.04= r , a 0.035 0.03 0.025 0.02= 0.015= 0.01 cfs 0.01 0.005: 0- 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) roamer unx.. MINOR MODIFICATION REQUEST— WATERSHED SPECIAL PERMIT / LECE..O.. 4• er, ./ THE APPLICANT IS PROPOSING ADDITION #2 AS SHOWN AS P , o•TOP °1>-a'P1D01f A MINOR MODIFICATION TO THE EXISTING WATERSHED SPECIAL • 3m PERMIT THAT HAD PERMITTED ADDITION fit AND THE REAR 0 6 0 0 0 •DN-1 DECK. I oc,•-a swmu;c EocE of � /" mr. mmvxws (mj SHEA -, MAT.HOLES 4•TO t5•TA SPED —NO UN,ESTABt15HFO LNOER W/a•TC 1 1/2- mcv-a.amn.c NN'T.IN I.n1E PEPN iLL /vortW v 5i(rvc 4 - Q SHCO STONE SEC..N NEW ENIENSOry CT a„s- - / _ _ \ II—) aP0°iROr wAm� HUN NO vEiLHT Y�ry _ 3➢0 GALLON ➢v 500E➢v STaN➢aR➢ 4u9ep C%�MaiE H(SI V/ATER \ -> l�soF— P1\'Y CO+>rvP Pu4RK WATERSHED SPECIAL PERMIT PRECAST CONCRETE ORYWELL - 500 GALLON "`per �./mod/ ten/ - - - TOWN OF NORTH ANDOVER NOT TO PLANNING BOARD SCHEDULE OF ORYWELL ELEMATIONS: OFTwEI.L 0, OF—/2 o ICI OF INNi I.,SO' INVERT INTO TANN: 13665' I4C65' P—L.a rINv. 2e * 13a20' P� /�!/ .''.y5 .- - _ \ —25• AREA-' SCION C4 STONE ,LO O 99,627 S.F.+/ ,/5+,' 24 \ SOIL INFORMA LION' /e Now /_ - is 'arr ze' �\ GATE �.v%nn•.nN,..o.F.as.r / ryazeaE /�P / ./ / \ \OCA o .wanow nns.--rz... -ran: ' ✓/ / `"�J\J- / 5— / / - / / \�\ O]•_ __ -- =;�evry e�Ile DEED RESTRICRONS' /A : _JIL/-fi mE L TORTL ALaa�Fo use ON n.rs Pace an C SF.—EN.P„asPPaFUS _ \� is , - - �� PROP, b w - NOry ORGAN C ES➢OCCS AND„EFe mOEE USE S PPON O TEC. / / �' ONE :_1 mL USE Or COAL TAR BASES PavwENr SLA—,IS PRCN B•r6a . I _ / Q K C ST41EUEN TS 5>•4LL 4PPEAF AS 4 GEED .O \� DECK 6 ..1 ROOCin STORY RES_Ol.N TO FUN mTN ME niLE Ecx 2 r'N� s L To FEN - ��- / 12 /p - _- ,S .vo / Ia' c C^4I�_ / A�OOl�TI ji s E 9.t8- �2 rn - Ne OF�Cr � ." 11 \ �P, aT " /E4f.f r- ;RUCR, s VFwnv 2a. `mom cSN�SPECIAL PERAIIr CRITERIA FOR EXPANSION- _ / / 3'W'10 '� S�f i •PROP.;CRCN EXiE / O '/Q.S�p• ( 0 (It0 FOR N OI // PEA SCCl_<;Ss(J)(C)(It)(oi 0,,INC I..NC N.- s.w / /> .-- s ➢-11'w / ufiJ' O T / o �� ooE`Es Nor`:aci u m // N•Hc NaN o sTuaeANCE our-FL»za'.E ccNsmucno.„cF - ILl.' •" 1 ...,..w SiaTE Law FOR N aP // I aN y ACCESS—LIT NE 111.OR E%PHv9Cv'OF ANY _ - I 2 Cf£SS uEANs E#S Sfr AREA 9Y LE55 S11 TWENry FlK(25)PERCENT OE;PE gYN EROSB iLOQR AREA CF THE En5➢NS PauAav SiRVC'URE IS EH C 1/ JI>I _ - T59➢]3v/ rJIS>'WQ I O I J S :///Sri ORcai<R-NAN 2500 SF_ /E� ,o• aJ OC' -z ]- GFA.OF EXISTING HOUSE: 4,44a SFt(PER ARCHITECT) >NE I 7J'S5'ISw •I 5.�.0 n � Ig- G.F.A OF PERMI"E0 AODITiON Hi. 1.012 S.Ft TOTAL: 5,461 S.F. T�TFLP N.rON E - TJ 03 Sri nn, SQz3 e0'w GREAT' / ; sa37s_-tea EP]A ao MAY.25Z EXPANSION. 1.365 SFt PEP ZONING BYLAW) G-.� �._ PROP.EXPANSION. I,179 S.F.t G♦ o B m L —-- &w°m R=A 0 #254 GREAT POND ROAD PLOT PLAN OF LAND L., l NIO Nr TAsiE. ra / EERu LOCATED IN ZONIN DISTRICT.RI c/ RECORD OWER5, �•'�� NORTH ANDOVER, MASSACHUSETTS W/IN WATERSHEO PROTECTION OISMtCr 1 c` ROAO aEoulaEO PPONom <Ea.�a" ASSESSORS-1 s °^. (ESSEX COUNTY) 'C x rrElcrrr ]s FEEr <s.FEEr �r„6' 15<raEAr POND ROAD � PREPARED FOR ^ Nor„ THOdIAS AND MCOLE FRIEL V fn A eV NORTH ANDO�rER.MA GI545 uIN.FRIXJT SEn9ACH !O EJ 25s rEx) J>9(P) 4'SO G I pC`;av LOr INFORMATION SCALE.110, DATE:NOV. 10, 2015 N.g0E SEt6Arx(U JO Fr 15C FT fP) g4�'.Nd'' Mrs LOT was CREATES AFTER U:Ta9ER 24,199<(E/2!/Z0;0) �¢/"�'"�k+y, ��[2ED Er SSE., N.SOC SETBACK(R) JO R 20.9 FI(P) G� wu�Y ,.A uw.aeaa sETeApr 30-T 4L]Fr rP) f>° REwsroNsR. 'fy '; SULLIVAN ENGINEERING GROUP, LLC a SVw LOT— r 219 Fr CRAPHIC SCALE J ]/I>/;ti u aean;o welar..na .xas .ns 116 n 6u �YA Ol— ucer=20 I nCL/S uAP� - c P<We Oeu Cnie P .IDS .AS (>B/)BSI-9L/I N.Lor nREA As 20 sF. z>IF FEET 20 02C .o r Iz/2z/I5 .e./O ml .IOs .ns SHEET No. I OF 1 No. Darr OEscmanavlA� er wvD FRONT ELEVATION. I WRLTA11M BALKUS ASSOSCIATES ARCHnEM TEL.978 887.3351 WBAARCHITECTS.COM POBMIffiTCPSFffiDMAOMMMAAR S®ICLOMCOM FRI -E- L R '•ES: 'IDE -NCE 254 GREAT POND ROAD NORTH A•NDOVER MA REAR 'ELEVATION a WIIL.iAMBALKUSA SOSCIATES ARCEUMM TEL.978 887.3351 WBAARC$ITECTS.COM PO BOX lESTOPSFEEW MA 019Hi F R I .E-.L R -E S.•.I D E'-ITT C- E 254 GREAT POND ROAD NORTH A-NDOVER MA RIGHT SIDE ELEVATION I • _ c3 s �c zo . . WnIIAM BALKUS ASSOSCIAIW ARCMIEM TEL.978 897.3351.WBAARCI ITECTS.COM POBM iffiTCFSFEEXDMA01963 MMRaMBMGELQUXM FRIE- L R -ES. IDE'-NCE 254 GREAT POND ROAD NORTH A•NDOVER MA LEFT SIDE ELEVATION N11DDI:t3 M BAUMS ASSSOyySa&TT�S . - - tIl����CJ�l.rl►J - T-EL.978 887.3351 WBAARCHITECTS.COM PO BOX IWMPSMDMAOM MM&MCBMECm9m , F R I •E- L R -E •S. I D E N CE 254 GREAT. POND ROAD NORTH A-NDOVER MA