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HomeMy WebLinkAboutDecision 4255 - B - Proposed Drainage & Grading PlanPROPOSED DRAINAGE LAYOUT THE FOLLOWING NARRATIVE IS FOR A PRELIMINARY SUBMITTAL TO REMOVE THE EXISTING MILL HILL CLUB AT THE CORNER OF ROUTE 28 AND MILL POND ROAD AND TOWN BROOK ROAD IN YARMOUTH, MA AND CONSTRUCT TWO (2) BUILDINGS WITH PARKING. THE DRAINAGE LAYOUT IS INTENDED TO DEMONSTRATE COMPLIANCE WITH APPLICABLE TOWN OF YARMOUTH REGULATIONS. EXISTING CONDITIONS AND HYDROLOGY THE SITE CONSISTS OF APPROXIMATELY 66,000 S.F. ALL OF WHICH IS UPLAND. ELEVATIONS ON THE SITE RANGE FROM ELEVATION 22 AT THE REAR OF THE SITE TO THE FRONT OF THE BUILDING. THE FRONT OF THE BUILDING RANGES FROM ELEVATION 22 TO ELEVATION 18 AT ROUTE 28. THE SURFACE CONDITIONS OF THE SITE IS THE BUILDING IN THE FRONT OF THE LOT, GRASS AND BUSHES AROUND THE PERIMETER OF THE LOT AND A LARGE COMPACT GRAVEL PARKING LOT THE RUNS FROM THE REAR OF THE BUILDING TO THE BACK OF THE PROPERTY. GRADING OF THE LOT DOES NOT PROVIDE FOR SURFACE RUNOFF. THE ENTRANCE ON MILL POND ROAD AND TOWN BROOK ROAD ARE PAVED AND ARE SLOPED TOWARDS THE STREETS. THE GRAVEL PARKING LOT IS NOT SLOPED TO PROVIDE SURFACE RUNOFF. THERE ARE NO DRAINAGE STRUCTURES ON THE SITE OR ALONG THE ADJACENT ROADWAYS TO PROVIDE RELIEF FROM SURFACE RUNOFF. PROPOSED CONDITIONS PROPOSED CONDITION CONSISTS OF TWO (2) BUILDINGS WITH TWO (2) ENTRANCES AND ASSOCIATED PARKING. BUILDING NO. 1, LOCATED AT THE FRONT OF THE LOT APPROXIMATELY THIRTY (30) FEET FROM THE RIGHT-OF-WAY LINE OF ROUTE 28, WILL BE 2,500 FEET IN SIZE WITH PAVED PARKING IN THE FRONT, SIDE AND REAR. OUTSIDE OF THE PARKING AREA WITH BE A 20 FOOT WIDE VEGETATED AREA ON ALL THREE SIDES THAT WILL HAVE NATURAL SLOPE TOWARDS THE STREET. BUILDING NO. 2, LOCATED AT THE REAR OF THE LOT APPROXIMATELY FIFTY (50) FEET FROM THE REAR PROPERTY LINE, WILL BE 7,300 FEET IN SIZE WITH PAVED PARKING IN THE FRONT, SIDE AND REAR. OUTSIDE OF THE PARKING AREA WITH BE A 20 FOOT WIDE VEGETATED AREA ON ALL THREE SIDES THAT WILL HAVE NATURAL SLOPE TOWARDS THE STREET. DRAIN DESIGN CRITERIA SINCE THERE IS NO DRAINAGE ALONG THE ADJACENT ROADWAYS TO PROVIDE RELIEF FROM SURFACE RUNOFF, THE RUNOFF FOR PAVED AREAS OF THE SITE WILL BE CONTAINED AND INFILTRATED ON SITE. THE PORTION OF THE SITE THAT WILL CONTINUE TO CONTRIBUTE SURFACE RUNOFF TO THE ADJACENT ROADWAYS ARE THE 20 FOOT WIDE VEGETATED AREAS AROUND THE PARKING LOT. THE PROPOSED DRAINAGE SYSTEM WILL BE TO CONTAIN THE PARKING AREAS AND ROOF RUNOFF WITH CATCH BASINS, TRENCH DRAINS AND LEACHING BASINS. THE SITE WILL COLLECT RUNOFF IN A SERIES OF CATCH BASINS LOCATED AT THE EDGE AND WITHIN THE PARKING AREAS. THE TRENCH DRAINS WILL BE LOCATED AT THE ENTRANCES ALONG THE PROPERTY LINES. THE CATCH BASINS WILL BE EQUIPPED WITH FOUR (4) FOOT DEPTH SUMPS TO REMOVE SEDIMENT. THE CATCH BASINS AND TRENCH DRAINS WILL DISCHARGE TO OIL SEPARATING MANHOLES THAT WILL FURTHER REDUCE SEDIMENT AND FLOATABLE POLLUTANTS PRIOR TO DISCHARGE TO THE LEACHING BASINS. STORM SEWERS AND LEACHING BASIN SHALL BE BASED ON A 10 -YEAR FREQUENCY STORM. THE INTENT OF THE DRAINAGE DESIGN IS TO PREVENT ADDITIONAL VOLUME OF FLOWS FROM THE EXISTING CONDITIONS. SINCE THERE HAS BEEN NO SOIL OR GROUNDWATER ELEVATIONS TESTING FOR THIS PRELIMINARY SUBMITTAL THE DESIGN FOR THE LEACHING BASINS BE BASED ON SOIL CONDITION DESCRIBED IN THE SOIL CONSERVATION SERVICES SURVEY. THE DEPTH OF THE BASINS HAVE BEEN DESIGN FOR FOUR (4) FEET IN ORDER TO MINIMIZE DEPTH TO GROUNDWATER. THE 6 FT DIAMETER X 6 FT DEEP WITH 4 FT OF STONE SURROUND PROPOSED FOR THIS SITE CAN HANDLE APPROXIMATELY 2,500 S.F. OF WATERSHED AREA FOR 90% RUNOFF. THE BASINS BEHIND EACH BUILDING HAVE BEEN SIZED TO HANDLE ROOF RUNOFF. AREAS WITHIN THE PARKING AREA PROPOSED FOR THE LEACHING BASINS ARE LARGE ENOUGH TO INCREASE THE DEPTH AND DIAMETER OF THE BASINS AFTER SOIL AND GROUNDWATER CHARACTERISTICS ARE DETERMINED. _EGEND CO PVC CLEAN OUT (SEPTIC) VQ PVC VENT PIPE (SAS) �) UTILITY POLE OSEWER MAN HOLE COVER / I \ LIGHT POST Qom. FLAG POLE SOD WATER SHUT OFF VALVE PLANNING BD. HYDRANT -a- TRAFFIC/STREET SIGN U GUY WIRE a=o SIGN ® WOOD BOLLARD (TYP) —W— UNDER GROUND WATER LINE G — UNDER GROUND GAS LINE X—X—X STOCKADE FENCE G G� CHAIN LINK FENCE 8 GAS METER HANDICAP PARKING - - - - - - - EDGE OF PAVEMENT - _ 76 - - EXISTING TOPOGRAPHY - - PROPERTY LINE 20— PROPOSED TOPOGRAPHY ❑ PROPOSED CATCH BASIN PROPOSED DRAINAGE FLOW PROPOSED LEACH PIT )POSED DRAIN MAN HOLE O PROF POSED TRENCH DRAIN PROL BENCH MARK — HYDRANT ON TAG BOLT Y1801 ELEV. = 21.85 MAP 45 LOT 78 `\ ;1 \ TRENCH civ DRAIN 12"W i a / ,\ 1 4\ �I /i 20.75' 0 CB R=20.5' kN I V N w � � X21.5' / MAP 37 LOT 85 1 / 2 /} CATCH BASINS - W/ — — — W/ 4' SUMP / TYPICAL / CB I =20.5' II \ �/6' DIA LEACH IT I WITH 4 FT STONE I (TYP) I I 21.0'X I 21----21— MAP 37 LOT 84 / i 21.25 N / I SLAB ELEV-22.V / I I ti o \ ry \ / �j HE y` I C� SLAB ELEV=22.0' 1 c 1�11'21 _/ 21.0'X / / CB / 20.75' CO / \ �o \ \ \\ \\ 1 �1• X21.0'CB R=20.75 \ \ 22 o � N --2:— 20.5' / 1 ^B R 20.5' p / 20'- `21 ry19 16 n \ I' el/ 6 Orn \ \ \ Q \ \ \ \ Route 28 / s g°\ \ L=23-.8�� \. ��- \�Q \\ �\R\=2Z&20' \ BENCH MARK - HYDRANT ON TAG BOLT #104 ELEV. = 21.10 \ \ PROPOSED DRAINAGE/GRADING PLAN 1 SCALE: 1"= 20'-0" D-1 20.75' J / / TURNING MILL NWC l / 22 MAP 37 LOT 83 > I I I / I / CB \ � / =20.5' \ \2 GRAPHIC SCALE 20 0 10 20 40 TOWN REALTY TRUST C/O KENMORE MANAGEMENT 654 BEACON ST 4TH FL BOSTON, MA 02215 SITE MILL HILL mm A&E FIRM III TURNING MILL CONSULTANTS, INC. DEVELOPERS, ENGINEERS AND CONSTRUCTION MANAGERS 68 TUPPER ROAD, UNIT 3 PO BOX 1159, SANDWICH, MA 02563 TEL: (508) 888-4383 — FAX: (508) 888-1246 www.tumingmillconsuftants.com SITE ADDRESS 164 MAIN STREET W. YARMOUTH, MA 02675 SUBMITTALS DRAWN BY: TDC/SRS CHECKED BY MFJ SHEET TITLE: � 1 L 1cl;1111■ T SHEET NUMBER: E 03/26/09 REV. PER PLAN. BOARD D 02/04/09 REV. FOR PLANNING BD. C 06/23/08 ISSUED FOR ZONING B 06/03/08 ISS. FOR ZONING REVIEW A PROFESSIONAL 03/28/08 ISS. STAMP FOR DESIGN REVIEW ti DRAWN BY: TDC/SRS CHECKED BY MFJ SHEET TITLE: � 1 L 1cl;1111■ T SHEET NUMBER: