STORMWATER MANAGMENT The Maryland-National Capital …...Montgomery County Department of Parks 9500 Brunett Avenue Silver Spring, Maryland 20901 (301) 495-2535 The Maryland-National
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LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD MNCPPC THE BRICK COMPANIES SITE IMPERVIOUSNESS AND SOIL MAP C-0.01 1 STORMWATER MANAGMENT COMPUTATIONS AND SOILS MAP Montgomery County Department of Parks 9500 Brunett Avenue Silver Spring, Maryland 20901 (301) 495-2535 The Maryland-National Capital Park and Planning Commission PARK CODE: C10 PLAN SCANNED: FINAL SCANNED: P:\SilverSpring\2089310 - Acorn Park\Drawings\Current\Plots\C-001 (SWM Computations).dwg Layout1 Plotted By: Matthew Batcher, 8/16/2018 12:52 PM, ---- ISSUED FOR PROCUREMENT ON___________________ REVISIONS Liber 14771 Folio 0531 Professional Certification. I hereby certify that these documents were prepared or approved by me, and that I am a duly licensed professional engineer under the laws of the State of Maryland. License No._________________________________ Expiration Date______________________________ ________________________________________________ Designer's Name ________________________________________________ Address ________________________________________________ City/State/Zip ________________________________________________ Telephone Number DESIGN Landscape Architect Date Checked By: Architect Date Checked By: Engineer Date Checked By: Drawn by Date Checked By: Rev. No. Date Description SCALE: AS SHOWN PROFESSIONAL STAMP REVIEW AND APPROVAL Project Manager Date Construction Manager Date Park Manager Date Date: ___________ DWG. # __________ SHT. # ______ of ____ DPS#_____ of _______ 08/14/2018 3 WD MB MA MA Stormwater Management Concept Acorn Urban Park 1190 East-West Hwy, Silver Spring, Maryland, 20910 SITE NOT TO SCALE PROPOSED WATER RESOURCE IMPROVEMENTS: TREATED IMPERVIOUS SURFACE MAP PROPOSED IMPERVIOUS AREA WITHIN THE LOD PROPOSED PLAYGROUND INFILTRATION PROPOSED MICROBIORETENTION LEGEND: PROPOSED IMPERVIOUS AREA DRAINING TO A SWM BMP PROPOSED PLAYGROUND INFILTRATION PROPOSED MICROBIORETENTION LEGEND: INDEX OF DRAWINGS: C0.01 SWM COMPUTATIONS AND SOILS MAP C3.00 STORMWATER CONCEPT PLAN C3.01 STORMWATER MANAGEMENT DETAILS SWM CONCEPT # 1 OF 3 2 OF 3 3 OF 3 SHEET # PER MONTGOMERY COUNTY DEPARTMENT OF PERMITTING SERVICES WATER RESOURCES TECHNICAL POLICY WRTP-5: ESDv = (PE x Rv x A) / 12 ESDv = (1.6" x 0.42 x 9,626 SF)/12 ESDv = 544 CF PER MONTGOMERY COUNTY DEPARTMENT OF PERMITTING SERVICES WATER RESOURCES TECHNICAL POLICY WRTP-5: REQUIRED ESDv: 544 CF PROVIDED ESDv: 545 CF HSG RATING Ub URBAN LAND MAP UNIT NAME MAP UNIT SYMBOL D SITE SOILS CHART: SITE ESDv AREA MAP SITE AREA USED FOR ESDv COMPUTATION = 11,557 SF LEGEND:
PER MONTGOMERY COUNTY DEPARTMENT OF PERMITTING SERVICES
WATER RESOURCES TECHNICAL POLICY WRTP-5:
ESDv = (PE x Rv x A) / 12
ESDv = (1.6" x 0.42 x 9,626 SF)/12
ESDv = 544 CF
PER MONTGOMERY COUNTY DEPARTMENT OF PERMITTING SERVICES WATER
RESOURCES TECHNICAL POLICY WRTP-5:
REQUIRED ESDv:
544 CF
PROVIDED ESDv:
545 CF
HSG
RATING
UbURBAN LAND
MAP UNIT NAME
MAP UNIT
SYMBOL
D
SITE SOILS CHART:
SITE ESDv AREA MAP
SITE AREA USED FOR ESDv
COMPUTATION = 11,557 SF
LEGEND:
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U
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TOP: 319.5'
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TOP: 321.6'
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(SE) 24" RCP INV:309.9'
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(NW) 24" RCP INV:309.8'
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TOP: 316.8'
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(S)18" RCP INV: 313.4'
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(N)24" RCP INV: 314.2'
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TOP: 44.3'
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DEBRIS
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TOP: 322.2'
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STONE WALK
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STONE WALK
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12" RCP INV: 314.4'
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TOP: 314.4'
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12" RCP INV: 314.3'
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TOP: 317.1'
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\\
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STONE WALK
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4"±
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SANITARY
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SANITARY
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INV.312.2
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(COMPUTED)
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24"RCP
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12"RCP
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12"RCP
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STORM
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STORM
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STORM
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STORM
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STORM
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EX.INLET
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EX.INLET
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15" RCP
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24" RCP
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21" RCP
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27" RCP
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15" RCP
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ITB-1A
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ITB-1B
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ITB-2
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INV.311.6
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(COMPUTED)
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INV.310.2
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(COMPUTED)
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12"
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14"
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28"
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38"
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6multi"
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6multi"
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6"
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SMH
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U
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TOP: 319.5'
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TOP: 321.6'
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(SE) 24" RCP INV:309.9'
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(NW) 24" RCP INV:309.8'
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TOP: 316.8'
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(S)18" RCP INV: 313.4'
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(N)24" RCP INV: 314.2'
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TOP: 318.4'
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UNABLE TO OPEN
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TOP: 316.4'
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TOP: 44.3'
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DEBRIS
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TOP: 322.2'
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STONE WALK
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STONE WALK
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12" RCP INV: 314.4'
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TOP: 314.4'
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12" RCP INV: 314.3'
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TOP: 317.1'
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\\
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STONE WALK
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4"±
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SANITARY
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SANITARY
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INV.312.2
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(COMPUTED)
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24"RCP
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12"RCP
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12"RCP
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STORM
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STORM
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STORM
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STORM
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STORM
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EX.INLET
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EX.INLET
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15" RCP
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24" RCP
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21" RCP
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27" RCP
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15" RCP
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ITB-1A
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ITB-1B
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ITB-2
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INV.311.6
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(COMPUTED)
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INV.310.2
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(COMPUTED)
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12"
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14"
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28"
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38"
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6multi"
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6multi"
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6multi"
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6"
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6"
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6"
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6"
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6"
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6"
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SMH
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SMH
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SMH
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U
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TOP: 319.5'
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UNABLE TO OPEN
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TOP: 321.6'
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(SE) 24" RCP INV:309.9'
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(NW) 24" RCP INV:309.8'
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TOP: 316.8'
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(S)18" RCP INV: 313.4'
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(N)24" RCP INV: 314.2'
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TOP: 318.4'
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UNABLE TO OPEN
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UNABLE TO OPEN
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TOP: 316.4'
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UNABLE TO OPEN
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TOP: 44.3'
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DEBRIS
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TOP: 322.2'
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STONE WALK
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STONE WALK
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12" RCP INV: 314.4'
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TOP: 314.4'
AutoCAD SHX Text
12" RCP INV: 314.3'
AutoCAD SHX Text
TOP: 317.1'
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\\
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STONE WALK
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4"±
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SANITARY
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SANITARY
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INV.312.2
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(COMPUTED)
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24"RCP
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12"RCP
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12"RCP
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STORM
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STORM
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STORM
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STORM
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STORM
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EX.INLET
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EX.INLET
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15" RCP
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24" RCP
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21" RCP
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27" RCP
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15" RCP
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ITB-1A
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ITB-1B
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ITB-2
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INV.311.6
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(COMPUTED)
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INV.310.2
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(COMPUTED)
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12"
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14"
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28"
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38"
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6multi"
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6multi"
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6multi"
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6"
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6"
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6"
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6"
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6"
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6"
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6"
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SMH
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SMH
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SMH
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U
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UNABLE TO OPEN
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TOP: 319.5'
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UNABLE TO OPEN
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TOP: 321.6'
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(SE) 24" RCP INV:309.9'
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(NW) 24" RCP INV:309.8'
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TOP: 316.8'
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(S)18" RCP INV: 313.4'
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(N)24" RCP INV: 314.2'
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TOP: 318.4'
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UNABLE TO OPEN
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UNABLE TO OPEN
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TOP: 316.4'
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UNABLE TO OPEN
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TOP: 44.3'
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DEBRIS
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TOP: 322.2'
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STONE WALK
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STONE WALK
AutoCAD SHX Text
12" RCP INV: 314.4'
AutoCAD SHX Text
TOP: 314.4'
AutoCAD SHX Text
12" RCP INV: 314.3'
AutoCAD SHX Text
TOP: 317.1'
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\\
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STONE WALK
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4"±
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SANITARY
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SANITARY
AutoCAD SHX Text
INV.312.2
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(COMPUTED)
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24"RCP
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12"RCP
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12"RCP
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STORM
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STORM
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STORM
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STORM
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STORM
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EX.INLET
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EX.INLET
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15" RCP
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24" RCP
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21" RCP
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27" RCP
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15" RCP
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ITB-1A
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ITB-1B
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ITB-2
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INV.311.6
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INV.310.2
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5,427 SQ. FT. OR 0.1246 ACRES PLAT NO. 19691
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76,045 SQ. FT. OR 1.7457 ACRES PLAT NO. 19691
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14"
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28"
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38"
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F/H
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F/H
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F/H
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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stop light pole
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SMH
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SMH
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SMH
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bikeshare station ahead
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no parking
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the silver spring
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acorn park
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acorn park
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stop
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bike may use full lane
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W/M
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W/V
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W/V
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U
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E
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E
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CROSS
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CROSS
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C
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E
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E
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S 35°37'52" E 36.76'
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S 54°21'58" W 181.48'
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MULTI-LEVEL BRICK BLDG.
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UNABLE TO OPEN
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TOP: 319.5'
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UNABLE TO OPEN
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TOP: 321.6'
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DOUBLE YELLOW LINE
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(SE) 24" RCP INV:309.9'
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(NW) 24" RCP INV:309.8'
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TOP: 316.8'
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(S)18" RCP INV: 313.4'
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(N)24" RCP INV: 314.2'
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TOP: 318.4'
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UNABLE TO OPEN
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TOP: 316.4'
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TOP: 44.3'
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DEBRIS
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TOP: 322.2'
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KENNETT
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EAST WEST HIGHWAY
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NEWELL STREET
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BOULDER
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CONC
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CONC
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WHITE LINE
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DOUBLE YELLOW LINE
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CONC
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STONE WALK
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BRICK WALK
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BRICK WALK
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ACORN
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GRAVEL
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BIKE RACK
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STONE WALK
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STONE WALK
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12" RCP INV: 314.4'
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TOP: 314.4'
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12" RCP INV: 314.3'
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TOP: 317.1'
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\\
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LOT 4 BLOCK 'C'
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PARCEL 'A'
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W/V
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W/V
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STONE WALK
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BRICK WALK
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TRASH CAN
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TRASH CAN
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BRICK WALK
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HATCH
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SHRUB
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GRAVEL
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322
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322
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322
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322
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322
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322
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321
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321
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321
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321
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320
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320
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320
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320
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319
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319
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318
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318
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317
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317
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4"±
AutoCAD SHX Text
318
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317
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318
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317
AutoCAD SHX Text
319
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319
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319
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319
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319
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316
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316
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318
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317
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317
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316
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320
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320
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320
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320
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321
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322
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319
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319
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319
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SANITARY
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SANITARY
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INV.312.2
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(COMPUTED)
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STREET
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24"RCP
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12"RCP
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12"RCP
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STORM
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STORM
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STORM
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STORM
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STORM
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EX.INLET
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EX.INLET
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15" RCP
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24" RCP
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21" RCP
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27" RCP
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15" RCP
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14"
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28"
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38"
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6multi"
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6multi"
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6multi"
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6"
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6"
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6"
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6"
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6"
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6"
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6"
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6"
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6"
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6"
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6"
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6"
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6"
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6"
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6"
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SMH
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SMH
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SMH
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U
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UNABLE TO OPEN
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TOP: 319.5'
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UNABLE TO OPEN
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TOP: 321.6'
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(SE) 24" RCP INV:309.9'
AutoCAD SHX Text
(NW) 24" RCP INV:309.8'
AutoCAD SHX Text
TOP: 316.8'
AutoCAD SHX Text
(S)18" RCP INV: 313.4'
AutoCAD SHX Text
(N)24" RCP INV: 314.2'
AutoCAD SHX Text
TOP: 318.4'
AutoCAD SHX Text
UNABLE TO OPEN
AutoCAD SHX Text
UNABLE TO OPEN
AutoCAD SHX Text
TOP: 316.4'
AutoCAD SHX Text
UNABLE TO OPEN
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TOP: 44.3'
AutoCAD SHX Text
DEBRIS
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TOP: 322.2'
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STONE WALK
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STONE WALK
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12" RCP INV: 314.4'
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TOP: 314.4'
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12" RCP INV: 314.3'
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TOP: 317.1'
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STONE WALK
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4"±
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SANITARY
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SANITARY
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INV.312.2
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(COMPUTED)
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24"RCP
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12"RCP
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12"RCP
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STORM
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STORM
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STORM
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STORM
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STORM
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EX.INLET
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EX.INLET
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15" RCP
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24" RCP
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21" RCP
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27" RCP
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15" RCP
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ITB-1A
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ITB-1B
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ITB-2
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INV.311.6
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(COMPUTED)
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INV.310.2
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(COMPUTED)
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14"
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28"
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38"
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6multi"
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6multi"
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6multi"
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6"
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6"
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6"
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6"
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6"
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SMH
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SMH
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SMH
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U
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UNABLE TO OPEN
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TOP: 319.5'
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UNABLE TO OPEN
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TOP: 321.6'
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(SE) 24" RCP INV:309.9'
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(NW) 24" RCP INV:309.8'
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TOP: 316.8'
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(S)18" RCP INV: 313.4'
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(N)24" RCP INV: 314.2'
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TOP: 318.4'
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UNABLE TO OPEN
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TOP: 316.4'
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TOP: 44.3'
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DEBRIS
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TOP: 322.2'
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STONE WALK
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STONE WALK
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12" RCP INV: 314.4'
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TOP: 314.4'
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12" RCP INV: 314.3'
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TOP: 317.1'
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STONE WALK
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4"±
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SANITARY
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SANITARY
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INV.312.2
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(COMPUTED)
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24"RCP
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12"RCP
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12"RCP
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STORM
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STORM
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STORM
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STORM
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STORM
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EX.INLET
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EX.INLET
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15" RCP
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24" RCP
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21" RCP
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27" RCP
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15" RCP
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ITB-1A
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ITB-1B
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ITB-2
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INV.311.6
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(COMPUTED)
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INV.310.2
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(COMPUTED)
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SCALE: 1"=40'
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IMP.=35%%%
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VICINITY MAP
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STORM WATER MANAGEMENT STRATEGY FOR THE PROJECT IS TO PROVIDE FULL TREATMENT OF THE ENVIRONMENTAL SITE DESIGN VOLUME (ESDv). FULL ESDv TREATMENT WILL SATISFY GROUNDWATER RECHARGE, WATER QUALITY, AND CHANNEL PROTECTION REQUIREMENTS PER THE MDE STORMWATER DESIGN MANUAL. PROPOSED WATER RESOURCE IMPROVEMENTS INVOLVE DIVERSION OF MD-410 RUNOFF FROM THE SPRING GROTTO, RUNOFF CONTROL / EROSION IMPROVEMENTS, AND ENVIRONMENTAL SITE DESIGN I.E. MICROBIORETENTION AND PLAYGROUND INFILTRATION UNDER THE ENGINEERED WOOD FIBER (EWF) PLAYGROUND - BASED ON PERMEABLE PAVEMENT DESIGN STANDARDS. THREE STORMWATER MANAGEMENT PRACTICES ARE PROPOSED, TO INCLUDE ONE LANDSCAPE INFILTRATION AND TWO MICROBIORETENTION CELLS. INFILTRATION RATE IS 0.66 IN/HR IN THE VICINITY OF THE PERMEABLE PLAYGROUND (SEE INFILTRATION TEST BORING ITB-2) AND 0.27 AND 0.06 IN/HR (TWO TESTS - ITB-1A AND ITB-1B) IN THE VICINITY OF THE MICROBIORETENTIONS. THE MICROBIORETENTIONS ARE PROPOSED TO BE IN SERIES; RUNOFF FROM THE MD-410 SIDEWALK IS TO BE COLLECTED WITH A TRENCH DRAIN TO DISCHARGE TO THE UPPER CELL WHICH WILL OVER-FLOW TO THE LOWER CELL OVER A WEIR WALL. COLLECTION OF SITE RUNOFF BY INLET(S) AT THE CENTER OF THE SITE IS TO BE MAINTAINED VIA RETENTION OF THE EXISTING INLET(S) OR BY ADDING NEW AND CONNECTING TO THE EXISTING DRAINAGE SYSTEM ON THE SITE WHICH DISCHARGES TO THE BACK OF THE SUMP INLET ON NEWELL STREET WHICH EMPTIES TO THE TRUNK DRAIN IN THE STREET. UNDER-DRAINS FOR THE TWO BIORETENTIONS WILL CONNECT TO THE EXISTING DRAINAGE SYSTEM ON SITE. THE EWF LANDSCAPE INFILTRATION WILL NOT REQUIRE AN UNDER-DRAIN SINCE IT HAS 0.66 INCHES PER HOUR INFILTRATION RATE. USE OF PERMEABLE PAVEMENTS WILL BE CONSIDERED IN THE SITE DESIGN OVER AREAS WHICH DO NOT HAVE SUFFICIENT INFILTRATION RESULTS (DUE TO TEST FINDINGS OR WHERE NO TEST HAS BEEN PERFORMED. UN-QUALIFIED PERMEABLE PAVEMENTS WILL NOT BE ACCOUNTED FOR IN THE COMPUTATIONS, BUT SHOULD HELP MAINTAIN PRE-DEVELOPMENT HYDROLOGY AND PROMOTE TREE HEALTH. SITE GRADES WILL BE MODERATELY FLATTER IN THE PROPOSED CONDITION. THE EXISTING SUMP AREA WITH THE INLETS WILL BE RAISED AND CONVERTED TO BIORETENTION AREA.
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SCALE: 1"=40'
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ACORN URBAN PARK SWM CONCEPT DRAWINGS:
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%%USWM COMPUTATIONS%%U:
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REQUIRED ESD VOLUME:
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PROPOSED BMP FACILITIES VOLUMES:
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SUMMARY:
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PROPOSED SITE ESDv SUMMARY CHART:
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SCALE: 1"=40'
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INV.319.2X
INV.318.8X
12" HDPE
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SLOPE TO
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STONE RUNNEL - MORTAREDSTONE CHANNEL ALONG PAVINGEDGE (1'-3" WIDE +/-)
DECK MEETS PAVINGFLUSH
WOOD BOARDWALKON HELICAL PIERS
EXISTING INLET TO BEREMOVED
319
PROPOSED TRENCHDRAIN
EXISTING SPRING
EXISTING SPRINGGROTTO WALL (TYP.)
MAINTAINEXISTING STAIRS
EXISTING BRICK PAVEMENT TOBE MAINTAINED AS NEEDED
EXISTING BRICK PAVEMENT TOBE MAINTAINED AS NEEDED
CONNECT BIORETENTIONUNDERDRAIN TO PROPOSED INLET
ARCHITECT / ENGINEER TO SPECIFYACCESSIBLE AND PERMEABLE SURFACEAT BOTTOM OF SPRING GROTTO
PROPOSED BENCH
PROPOSED LANDSCAPE WALL
NEW SEAT WALL
EWF PLAY AREA PROPOSED PLUNGE POOL
12" HDPE
PROPOSED MANHOLE,CONNECT TO EXISTING
24" STORM DRAININV.OUT= 310.2
PROPOSEDBOULDER (TYP.)
PROPOSEDBOULDER (TYP.)
PROPOSEDBOULDER (TYP.)
PROPOSEDMANHOLE
EXIS
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PROPERTY LINE
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PROPOSEDCLEANOUT
4"PVC
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PLAYGROUNDINFILTRATIONOVERDRAIN
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DRAIN
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STORMWATER CONCEPT PLAN
STORMWATER CONCEPTPLAN
PROPOSED IMPROVEMENTS LEGEND:
AT-GRADE IMPERVIOUS PAVEMENT AREA
RAISED DECKING IMPERVIOUS WALK / PLATFORM AREA
ENGINEERED WOOD FIBER PLAYGROUND AREA
PLAYGROUND INFILTRATION UNDER ENGINEERED WOOD FIBER
PLAYGROUND AREA
BIORETENTION AREA
DRAINAGE AREA BOUNDARY
STORM DRAIN PIPE
PERFORATED UNDERDRAIN OR OVERDRAIN PIPE
LIMITS OF DISTURBANCE
INFILTRATION TEST BORING
C-3.002Montgomery County Department of Parks
9500 Brunett AvenueSilver Spring, Maryland 20901
(301) 495-2535
The Maryland-National CapitalPark and Planning Commission
WB KENNETT STREET LLC THE BRICK COMPANY PLAT NO. 19691 LOT 4 BLOCK 'C' 76,045 SQ. FT. OR 1.7457 ACRES
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28"
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38"
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6multi"
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6multi"
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6"
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6"
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6"
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6"
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6"
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6"
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6"
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6"
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6"
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6"
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6"
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6"
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F/H
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F/H
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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L/P
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stop light pole
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SMH
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SMH
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SMH
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W/M
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W/V
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W/V
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E
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E
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CROSS
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CROSS
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C
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323.1'
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322.0'
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321.4'
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321.4'
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320.4'
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319.5'
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317.5'
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318.7'
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318.6'
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312.1'
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311.8'
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319.5'
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319.3'
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318.1'
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317.1'
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318.0'
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318.6'
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321.5'
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320.5'
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319.3'
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321.8'
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322.2'
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321.9'
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E
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S 35°37'52" E 36.76'
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S 54°21'58" W 181.48'
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C3
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C4
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MULTI-LEVEL BRICK BLDG.
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UNABLE TO OPEN
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TOP: 321.6'
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DOUBLE YELLOW LINE
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(SE) 24" RCP INV:309.9'
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(NW) 24" RCP INV:309.8'
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TOP: 316.8'
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(S)18" RCP INV: 313.4'
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(N)24" RCP INV: 314.2'
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TOP: 318.4'
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UNABLE TO OPEN
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UNABLE TO OPEN
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TOP: 316.4'
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UNABLE TO OPEN
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TOP: 44.3'
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DEBRIS
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TOP: 322.2'
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KENNETT
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EAST WEST HIGHWAY
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NEWELL STREET
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BOULDER
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CONC
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CONC
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WHITE LINE
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DOUBLE YELLOW LINE
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CONC
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STONE WALK
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BRICK WALK
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BRICK WALK
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ACORN
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GRAVEL
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BIKE RACK
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12" RCP INV: 314.4'
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12" RCP INV: 314.3'
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\\
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PARCEL 'A'
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W/V
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W/V
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312.0'
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311.9'
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311.9'
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311.7'
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311.9'
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311.9'
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311.8'
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311.9'
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317.1'
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317.8'
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317.9'
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317.9'
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317.3'
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316.7'
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316.0'
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316.7'
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316.2'
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315.9'
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315.2'
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315.7'
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315.1'
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314.5'
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314.0'
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314.6'
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314.0'
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312.9'
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313.9'
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313.9'
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313.0'
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312.5'
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312.9'
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312.9'
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313.4'
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313.5'
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314.1'
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314.0'
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314.7'
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314.6'
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315.3'
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315.3'
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315.9'
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315.9'
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316.6'
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316.7'
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317.5'
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317.7'
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314.5'
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314.6'
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317.8'
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317.3'
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317.5'
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321.3'
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321.5'
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321.3'
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321.1'
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BRICK WALK
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FF: 322.7'
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321.7'
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320.9'
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321.5'
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320.9'
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320.6'
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319.9'
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319.5'
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319.2'
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319.1'
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318.8'
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318.5'
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318.6'
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319.0'
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319.6'
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320.1'
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320.5'
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321.2'
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321.4'
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320.9'
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321.0'
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321.4'
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321.4'
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BRICK WALK
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HATCH
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SHRUB
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GRAVEL
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321.4'
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321.0'
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321.0'
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320.3'
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319.9'
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319.3'
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318.6'
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321.7'
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321.5'
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321.0'
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320.4'
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319.9'
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319.1'
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318.8'
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318.0'
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317.5'
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317.5'
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FF: 321.5'
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FF: 318.2'
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RISER: 317.7'
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317.2'
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321.3'
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321.1'
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321.2'
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321.3'
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319.4'
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319.4'
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319.2'
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319.2'
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BC:318.6'
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TC:319.0'
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BC:319.9'
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TC:320.2'
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BC:316.9'
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TC:317.3'
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315.4'
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315.31'
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315.7'
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315.4'
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322
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322
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322
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321
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321
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321
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320
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320
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320
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319
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319
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318
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318
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317
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317
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4"±
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TW 315.25'
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318
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317
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318
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317
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319
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319
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319
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319
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319
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316
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316
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318
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317
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316
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320
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320
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321
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322
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319
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SANITARY
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SANITARY
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INV.312.2
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(COMPUTED)
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STREET
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24"RCP
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12"RCP
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12"RCP
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STORM
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STORM
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STORM
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EX.INLET
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EX.INLET
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15" RCP
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24" RCP
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27" RCP
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ITB-1A
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ITB-1B
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ITB-2
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PUBLIC - 42' R/W
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(MD RTE. 410)
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60' R/W
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INV.311.6
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INV.310.2
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GAZEBO
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FF:318.2'
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L/P
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318.6'
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(SE) 24" RCP INV:309.9'
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(NW) 24" RCP INV:309.8'
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BOULDER
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CONC
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GRAVEL
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12" RCP INV: 314.4'
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TOP: 314.4'
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314.7'
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314.6'
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315.3'
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315.3'
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315.9'
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315.9'
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316.6'
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316.7'
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317.5'
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317.7'
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318.5'
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319.1'
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318.8'
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318.0'
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317.5'
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FF: 318.2'
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317.2'
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315.4'
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317
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319
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319
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316
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INV.312.2
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24"RCP
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12"RCP
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12"RCP
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EX.INLET
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ITB-1A
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ITB-1B
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1 inch = ft.
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( IN FEET )
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GRAPHIC SCALE
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0
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SCALE: 1"=10'
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ACORN URBAN PARK (THE SITE) IS LOCATED IN DOWNTOWN SILVER SPRING, MD ON THE WEST SIDE OF EAST-WEST HIGHWAY (MD-410). THE SITE IS BOUND BY NEWELL STREET TO THE WEST, KENNETT STREET TO THE SOUTHWEST, AN OFFICE BUILDING TO THE SOUTHEAST AND MD-410 TO THE EAST/NORTHEAST. EXISTING AMENITIES AND SITE CONDITIONS INCLUDE THE PHYSICAL SPRING WHICH THE CITY OF SILVER SPRING IS NAMED AFTER, AN ACORN SHAPED GAZEBO, AND TREES INCLUDING TWO LARGE CANOPY TREES (28" AND 38" DBH). ALSO CURRENTLY ON THE SITE IS A VARIABLE WIDTH SIDEWALK BETWEEN 10 AND 16 FEET WIDE TRAVERSING THE SOUTHEAST SIDE OF THE SITE, PARK BENCHES, AND LIGHTING. SIDEWALKS ALONG SITE FRONTAGE INCLUDES A 13' WIDE WALK ALONG MD-410, A 15' WIDE WALK ALONG KENNETT STREET AND A 6' WIDE WALK ALONG NEWELL STREET AT THE NORTHWEST CORNER OF THE SITE ONLY. THE SPRING HAS NOT BEEN ACTIVE SINCE NEARBY DEVELOPMENT CUT OFF THE FLOW. THE SPRING IS IN A STONE GROTTO BUILT AROUND THE SPRING SUMP WITH AN APPROXIMATELY 4' TALL WALL AND STEPS TO ACCESS THE AREA. AN EXISTING FOUNTAIN PUMP IN THE SPRING GROTTO HAS BEEN DE-COMMISSIONED. EXISTING UTILITIES ON THE SITE INCLUDE WATER SUPPLY TO THE PUMP AND OFFICE BUILDING, ELECTRIC SUPPLY TO THE SITE LIGHTING AND THE PUMP, AND A STORM DRAIN RUNNING FROM THE OFFICE BUILDING TO AN INLET ON NEWELL STREET. TWO INLETS IN THE PARK EMPTY INTO THIS LINE. ADDITIONAL UTILITIES IN THE RIGHT OF WAY INCLUDE SANITARY AND STORM SEWER MAINS IN THE STREET AND A WATER MAIN UNDER THE SIDEWALK ALONG NEWELL STREET. UTILITIES ALONG MD-410 INCLUDE A STORM DRAIN MAIN TRAVERSING FROM THE STREET TO UNDER THE SIDEWALK, AN ELECTRIC MAIN WITH A VAULT AND A TELECOMMUNICATIONS LINE UNDER THE SIDEWALK, AND A WATER MAIN ALONG THE EAST SIDE OF MD-410. THE SITE PROPERTY INCLUDES AREAS OWNED BY THE MARYLAND NATIONAL CAPITAL PARK AND PLANNING COMMISSION (MNCPPC), PORTIONS OF RIGHTS OF WAY OF ADJOINING STREETS AND AN APPROXIMATELY 31' WIDE AREA ADJACENT TO THE BUILDING WHICH IS PART OF THE PROPERTY THAT THE OFFICE BUILDING IS LOCATED ON. THESE PROPERTIES ARE DOCUMENTED ON PLAT No. 19691 TITLED "LOT 4 & PARCEL 'A', BLOCK 'C', SILVER SPRING, 13TH ELECTION DISTRICT, MONTGOMERY COUNTY, MARYLAND." EXISTING SITE TOPOGRAPHY AND DRAINAGE DIRECTS WATER PRIMARILY TO THE SUMP INLET AT NEWELL STREET WHILE A PORTION OF RUNOFF WILL END UP IN THE SPRING GROTTO SUMP. NEWELL STREET SLOPES DOWNWARD TOWARDS THE SUMP INLET AT 4% FROM BOTH THE SOUTHWEST AND NORTHEAST. SITE SLOPES ON THE SOUTHWEST ARE A SIMILAR 4%, BUT THE NORTHWEST PORTION OF THE SITE INCLUDES THE SPRING AREA WHICH SLOPES DOWN TO THE GROTTO WALL AT 4:1 (25%). DRAINAGE AT THE NORTHEAST PORTION OF THE SITE HAS BEEN AN EROSION PROBLEM LEADING TO SEDIMENTATION IN THE GROTTO DUE TO THESE HIGH SLOPES AND WATER RUNNING OFF FROM THE MD-410 SIDEWALK BACK INTO THE SITE. EROSION AND SEDIMENT CONTROL MEASURES HAVE BEEN IMPLEMENTED INCLUDING A GRAVEL DRAINAGE CHANNEL AND EROSION CONTROL FILTER SOCKS. PROPOSED PARK AMENITY IMPROVEMENTS INCLUDE ACCESS IMPROVEMENTS TO THE ACORN GAZEBO AND THE SPRING, REVISED PAVEMENTS AREAS INCLUDE THE USE OF DECKING WITH DRILLED PIERS IN AREAS NEAR TREES TO LIMIT DAMAGE TO EXISTING TREE ROOTS AND LANDSCAPING WITH NEW PLANTINGS AND SEAT WALLS.
