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HomeMy WebLinkAboutWPO201600042 Plan - VSMP Minor Amendment 2017-11-06GENERAL NOTESt t t t , Sheet Number 1. OWNER & DEVELOPER: CUL VERT RIO ROAD HOLDINGS, L.L.C. SWM -2 CORPORA TE ADDRESS. 1900 ARLINGTON BLVD., SUITE A DROP INLET & STRUCTURE NO. CHARLOTTESVILLE, VA 22903 BENCH MARK STREET ADDRESS. U -j > 590 RIO ROAD EAST CHARLOTTESVILLE, VA 22903 CLEARING LIMITS TREESDALE LP U 1821 AVON ST EXT SUITE 200 PROPOSED PAVEMENT CHARLOTTESVILLE, VA 22902 VOOT STANDARD STOP SIGN 2 ENGINEER: - - - - 200- - - COLLINS ENGINEERING DEPTH OF EC -JA DITCH 200 GARRETT STREET, SUITE K PROPOSED CONTOUR CHARLOTTESVILLE, VA 22902 240.55 TELE.- 434-293-3719 E-MAIL: Scott@collins-engineering.com TBC DENOTES TOP/BACK OF CURB CONTACT• MR. SCOTT COLLINS, PE J 061/12-01-00-00080 . TAX MAP NO. RIO MAGISTERIAL DISTRICT) DEED BOOK 4112, PC J96 TAX MAP NO. 06100-00-00-18200 (RIO MAGISTERIAL DISTRICT) DEED BOOK 3934 PG 235 4. ZONING. R-4 (RESIDENTIAL) ENTRANCE CORRIDOR. NONE Uj 5. WATERSHED & DRAINAGE DISTRICT- MEADOW CREEK WATERSHED 0 0 6. BUILDING SETBACKS: (NOT APPLICABLE TO T1 IS AMENDMENT) FR ON T- 25 FEET MINIMUM SIDE. 15 FEET MINIMUM BACK. 20 FEET MINIMUM 7. DENSITY- 48 UNITS (TOTAL) (NOT APPLICABLE TO THIS AMENDMENT) Uj 34 DETACHED SINGLE FAMILY UNITS 14 A TTA CHED TOWNHOUSES 48 UNITS / 13.01 AC. = J.664 UNITSIAC. 8. PLANNED LAND USE SUMMARY- (NOT MODIFIED WITH THIS AMENDMENT) TOTAL PARENT PARCEL AREA: 13.101 AC. A CREA GE IN RESIDEN TIA L L 0 IS. 6.94 AIC. TOTAL RESIDENTIAL LOTS: 36 ACREAGE TO BE DEDICATED TO PUBLIC USE (ROADS): 2.02 AC. (15.47.) ACREAGE IN OPEN SPACE TO BE RESERVED IN DEED FOR COMMON USE OF LOT OWNERS IN SUBDIVISION: 4. OJ A C. (30. 87.) ACREAGE IN NON -OPEN SPACE TO BE RESERVED IN DEED FOR COMMON USE OF LOT OWNERS IN THE SUBDIVISION: 0.111 AC. (0,857.) LOTS I-34.- DETACHED SINGLE-FA&IILY HOMES WITH ATTACHED GARAGES FACING STONEWA TER DRIVE AND STONEWA TER CIRCLE LOTS 35&36: FUTURE SITE FOR 14 TOWNHOMES SERVED BY NEW PUBLIC CRO,')SS-STREET ALL PROPOSED LOTS EACH CONTAIN A BUILDING SITE THAT COMPLIES WITH SECTION 4.2.1 OF THE ALBEMARLE COUNTY ZONING ORDINANCE. 9. SUBDIVISION STREETS. CURB & GUTTER 10. ADJACENT PROPERTIES STONEHENGE SECTIONS 7 AND 8 D. B. 614, PG. 512 PLAT STONEHENGE SECTION 6 D.B. 586, PG. 405 PLAT, D.B. 567, PG. 404 PLAT IMP 61AI02-02A, NIF STONEHENGE HOMEOWNERS' ASSOCIATION, INC. D.B. 570, PG. 278, D.B. 570, PG 266 PLA T TMP 61-18J, NIF ALBEMARLE HOUSING IMPROVEMENT PROGRAM, INC. D.B. 2897, PG. 464, D.B. 665, PG. 147 PLA T, D. B. 454, PG. 654 PLA T CURRENT USE- RESIDENTIAL (COMMON AREA ANDIOR VACANT) STATE ROUTE 631 -RIO ROAD EAST VARIABLE WIDTH RIGHT OF WAY 11. DATUM AND BENCHMARK REFERENCE BOUNDARY, EASEMENTS, AND PLAT DATA BASED ON SURVEYS BY - KIRK HUGHES & ASSOCIATES 220 EAST HIGH STREET CHARLOTTESVILLE, VA 22902 12.CRI TICAL SLOPES (WAIVER APPROVED WITH SUB 2005-241): TOTAL AREA WITH CRITICAL SLOPES. 3.17 AC. 7. OF PROPERTY WITH CRITICAL SLOPES.- 24,57. RESIDENTIAL LOTS IMPACTED BY CRITICAL SLOPE DISTURBANCE 8 TOTAL RESIDENTIAL AREA WITH CRITICAL SLOPE DISTURBANCE.• 0.28 AC. TOTAL ROAD AREA WITH CRITICAL SLOPE DISTURBANCE. 0.10 AC. 7 OF TOTAL PROPERTY WITH CRITICAL SLOPE DISTURBANCE: 2.937. 13MAXIMUM BUILDING HEIGHT- 35 FEET (NOT APPLICABLE TO THIS AMENDMENT'") 14. PROPOSED IMPERVIOUS COVER ON SITE. 6.32 AC. (PER APPROVED PLANS, NOT MODIFIED WITH THIS A MENDMEN I) 15. NO LUMINARIES PLANNED FOR THIS DEVELOPMENT SHALL EXCEED THE J,000 LU(MEN LIMIT THERE ARE ALSO NO PROPOSED STREET LIGHTS 16.CONTRACTOR SHALL VERIFY LOCATION AND ELEVATION OF ALL UNDERGROUND UTILITIES SHOWN ON PLANS IN AREAS OF CONSTRUCTION PRIOR TO ST A R 77NG WORK. CON TA C T ENGINEER IMMEDIA TEL Y IF L OCA TION OR ELEVATION IS DIFFERENT FROM THAT SHOWN ON PLANS, IF THERE APPEARS TO BE A CONFLICT AND UPON DISCOVERY OF ANY UTILITY NOT SHOWN ON THE PLANS. 17. COLLINS ENGINEERING SHALL NOT HAVE A U THORI TY OVER CON IRA C TOR'S WORK, SAFETY PRECA U TIONS, SCHEDULES, OR COMPLIANCE WITH LAWS AND REGULATIONS. WE SHALL NOT ASSUME RESPONSIBILITY FOR ANY CONSTRUC77ON STARTED PRIOR TO PLAN APPROVAL. N", X, T. A. T I fill MA 1 01901 Akadift wle 11 N T c O t -7' Lf.)T. 01 . ............... LST IN ................. .. . .... .. . ....... PRXI VNIF I W I No MR A wsmuy IL ROADS 6- LEGEND EXISTING CULVERT Sheet Number EARTH DITCH CUL VERT COVER SWM -2 STORMWATER MANAGEMENT CALCULATIONS DRIVEWAY CULVERT DROP INLET & STRUCTURE NO. A BENCH MARK CURB U -j > II> 0 CLEARING LIMITS CURB & GUTTER U PROPOSED PAVEMENT VOOT STANDARD STOP SIGN -JA EC DI FCH - - - - 200- - - EXISTING CONTOUR DEPTH OF EC -JA DITCH 200. PROPOSED CONTOUR EC -2 DITCH 240.55 PROPOSED SPOT ELEVATION TBC DENOTES TOP/BACK OF CURB DEPTH OF EC -2 DI TCN TAB DENOTES TOP OF BOX Y -Y -y Sheet List Table Sheet Number Sheet Title T-1 COVER SWM -2 STORMWATER MANAGEMENT CALCULATIONS THIS ALMENDMENT's PROPOSED CHANGES ARE ASSOCIATED WITH RAISING THE EMBANKMENT 4'. THE PLAN ALSO CONFIRMS ALL WATER QUALITY AND QUANTITY REQUIREMENTS CONTINUE TO BE MET. A,A AV A A A A A A A A A A 3 APPROVED by the Albemarle County Community Development Department Date File I certify that these final plans meet the requirements of the Albemarle County Zoning Ordinance, ' the Water Protection Ordinance, the Subdivision Ordinance, and the Design Standards Manual, and are prepared in accordance with the Engineering Expedited Review Final Plans Checklist. Signature Date m Awr" BUILDING OFFICIAL FIRE OFFICIAL ALBEMARLE COUNTY SERVICE AUTHORITY VIRGINIA DEPARTMENT OF TRANSPORTATION LU 0 UU.,NAL is 0 ��o CL 092028 0 SCALE 0 0 SHEET NO. U -j > II> 0 0 U 0 >1 E z LU LU z cnz Uj 0 0 0 0 Uj X LU U C3 LU 0 Uj 0 JOB NO. 092028 0 SCALE AS SHOWN in SHEET NO. Perforated oc FOUNDATION DRAIN SECTIO.+ A-9: TYPICAL. G&VHIC AL DETAILS s .. Homogeneous 11 I min cif � xt,_W 'off tranch- Cabal suitable Soil Or rock L - - - - ...._ - - - - - J TYPICAL HOMOGENEOUS EMBANKMENT Trweition fill Rock or gro e► "�,Blonket drain BLANKET DRAIN �Snrt•y amnl Sand, oaF" or rook Rock or gravel Rods toe; 01'�It �T flier Tronaition filter CHIMNEY DRAIN TOE DRAIN Figure A -la. Homogeneous Embankments +vi Seepage Controls PLANT LIST - POND LANDSCAPING 8c SWM Notes Description Common Name Quantity Caliper Size Comments TREES (Used for construction of existing Part W • 1/2" Pine plated hook Dim 8 PIM C attached with 3,/8' fastener Cedrus Deodara Deodar Cedar • -6 ht. multi -trunked O2-1,f8" dna. holes Magnolia Grondiflora Little Gem Little Gem Magnolia YI ft • ®�� -6 ht. B&B multi -trunked 4®� Cu ressus X Lelandii Leyland Cypress �ON -6 ht. 54 _ Isometric Magnolia via iniana pipe 1/4' HDPE plate (optional) -6 ht. eutveri •;/'�`" Junii2erus Vir iniana Eastern Red Cedar a� -6 ht. StronQ central leader -, HDPE structural plastic wilt; CrvDtomeria Japonica t" 0 2-1/8' holes and 1/4' plata -6 ht. Strong central leader j 0 manufactured by Plastic S II LX j 01O.JO 9mEutlons Ire. or equal IN V.'81.00 1 0000 Clethra alnifolia Hummin bird i Ff4� Shawn with optional plate 1 8 min. At time of planting HnPf. structural plantle with Cornus sericea Red Twia Dogwood 2-1/8" holes and 1/4' prate Section manufactured by Plastic 8 min. At time of planting Sotvtirno Inc or equal Hydrangea uercifolia 6/8' die he', 8 min. At timef planting 00 Ilex Glabro Inkberry Holly o8(D TF min. At time oflantin IV Ilex verticillate Winterberr a 8 rnin. single eae Elevation I Lindera benzoin orHtico 1 9 8 rnin. At time of plantin PLASTICSaLUiIONS 392.2 ' D F RIS CAGE P.o. Box 4386 lietcln"ter vl 22w4 390 INC. 877-877-5727 MwsE as.so' •rs-�luytcaolis:»a cum 1. , "k PLANT LIST - POND LANDSCAPING 8c SWM Notes Description Common Name Quantity Caliper Size Comments TREES (Used for construction of existing Part W DIM 1% Dim 8 PIM C CD Cedrus Deodara Deodar Cedar 4 -6 ht. multi -trunked MG Magnolia Grondiflora Little Gem Little Gem Magnolia 2 -6 ht. B&B multi -trunked CL Cu ressus X Lelandii Leyland Cypress 26 -6 ht. 54 _ MV Magnolia via iniana Sweetba Ma nolia 2 -6 ht. B&B multi -trunked JV Junii2erus Vir iniana Eastern Red Cedar 8 -6 ht. StronQ central leader CJ CrvDtomeria Japonica Cryptomeria 2 -6 ht. Strong central leader SHRU S From 5 to 25 years \ IN V.'81.00 H Clethra alnifolia Hummin bird Hummincibird Sumrnersweet 16 8 min. At time of planting CS Cornus sericea Red Twia Dogwood 15 8 min. At time of planting HQ Hydrangea uercifolia Ookleof H dran ea 4 8 min. At timef planting IG Ilex Glabro Inkberry Holly 41 TF min. At time oflantin IV Ilex verticillate Winterberr 11 8 rnin. timeof Ian in LB I Lindera benzoin I S icebush 1 9 8 rnin. At time of plantin LANDSCAPE PLAN s SCALE: \ \ \ 6' 6AK \ \ \ 24 "BEE Mi �� � Figs F T E \ \ � \ \ M)\ A \\ \ \ / / \ \ \\�� \ \\ >T INg \ \ H g .4873 `eG. 70 A -BEE \ \ \ \ \ "�EE \ \\ \ \ \ \ \ 24"MAPL \ \ \ \ \ \ \ \ \ \ \ \ 36 A \ \ \ \ 220' SANITARY SEW \TD8.4364 P 5 EE' H \ \ � THE PROPOSED LANDSCAPING \ \ o Ta1RMWAT R M A ENT\ \ \ - \ SHOWN DOES NOT REMOVE, ADD \F C TY EASEMEj T ' �\ OR ALTER THE SPECIES OF THE \ o ��s u�rtuA \ \ \ Y PI ANTINC;S APPRC)VFD tJNDFR THIS Storm Rax M ROUND SERIES TRASH RACK CONCRETE MANHOLE STANDARD 60 INCH RACK SHOWN DIMENSIONS IN INCHES PLAN HOPE STaUcru nwI PL*A=Rn' PLASTIc SOLt1T HWS, N0. A f SIDE VIEW StormRax'" Round Series for Concrete Manhole (Used for construction of existing Part W DIM 1% Dim 8 PIM C Min ID to 40 W24 17 Y4 14 Y4 28 1a 30 F&36 21 14 40 36 43 PS48 Z7 is 54 _ as 57 _ RS -60 27% 19 3, 6634 60 70 Plastic Sdutions. Inc. CUSTOMER: " PO BOX 4386. W nctwste r, VA 22,004 z3e tvltfhee Rd, Wnchnoer. VA 22603 :877) 877-5727 phone ppQ�CT_ {540) 722-2219 bx http/Awww.p1&sft-soludm.ow. APPROVED SEDIMENT BASIN VOLUMES (Used for construction of existing sediment basin) Elevation Area of Contour Volume 383 8,920 0 384 9,993 9,451 386 12,238 31,645 388 14,606 58,454 390 17,075 90,103 391 18,760 108,013 APPROVED WATER QUALITY VOLUMES (SHEET SWM -2) Proposed Impervious Areas 275,302 sf Water Quality Volume (1 x) 11,471 cf APPROVED WATER QUANTITY OUTFLOWS (SHEET SWM -2) 2 -year Flow 5.71 cfs 10 -year Flow 12.93 cfs 1' of Freeboard Achieved YES ISOMETRIC CONCRETE STRUCTURE DIMENSIONS INSIDE STRUCTURE DIMENSION OUTSIDE STRUCTURE DIMENSION AVAILABLE OPTIONS CROSS BRACING FOR OVERHANG HDPE AN 11 -VORTEX PLATE DATE DRAMM BY: AM 0Y: DETAIL - AMENDMENT WET POND VOLUMES (Upper 6' of water count towards Water Quality Volumes) Elevation Area of Contour Volume 384 4,866 0 386 6,567 11,391 388 8,699 26,607 0390 11,270 46,520 392 13,950 71,693 394 16,340 101,951 395 17,648 118,941 AMENDMENT WATER QUALITY VOLUMES Water Quality Volume Required (4x) 45,884 cf Water Quality Volume Provided 46,520 cf (Below MWSE: 4' depth min. & G depth maximum) Per 1999 VSMH, Chpt. 3, page 3.06-9, Type 11 Retention Basins providing a 50% phosphorous RR do not require aquatic benchs if the basin surface areas do not exceed 20,000sf. AMENDMENT WATER QUANTITY OUTFLOWS 2 -year Flow 5.06 cfs 10 -year Flow 12.18 cfs F of Freeboard Achieved YES ENA 1APC BEE OETAL A 0 i x T 0 FRONT ELEVATION A -J 04 W= a s- C -C EACH WAY. EACH FACE NOTES: L CONOMM TO K 4000 PSI MMM41 COMPREMa 57RENOM 2T rot AQ4JSTEn TO ATE SECTION A -A F PPE EB OBE SIrEMED Til OPDNN' /ICC01000 ANGLES LP TO 45•. ENDWALL FOR CIRCULAR PPE 3 F13FORCM STEEL N ACCORDMICE WRH ASTM A-416 QiEWOBCMq BARS). QUIETER Of PIPE C14.VERT 4. PPE OPDS495 N PRECAST GRAW4 E WrS SHALL MOT EX= 4 RXM AT W" 15" 2r OR 24. 27" OTR 30" 3S' OR 36" ANY GIVDI PONT BETWEOI THE PPE AND THE PRMW UNT. r-3" r 5- 312" T -to" 4'4- 3. ONEGUIS SWM ME WRIKK ACTUAL IEW100M MAY VARY WrN W'-0- ~ACTINOM TOLERANCE - W - 0'-r 0-2W O'- 0'- 6. N NO CASE SHALL TOP OF ENDWALL PROJECT ABOVE FLL SLOPE. WW SLOPE, OR SD ADM Ir -4/r V -lox" (F-2- a_m" a-3" 7. =A& 1BE D Nl MEA5 EXCEPT WNERE A C@FUCT WOH m; L 13V411 EDGE a MOURM ON THE HEADWALL AT 7HE KU ENO OF THE CULVERT. SHAPE M BE � 3'-e• HEMWN.L AT OUTLET EO MAY N EITHER SQUARE EDGE OR BE11 LEMELE 9E RTM _I a �I a• Ye' CHMM MAY BE PROVEED ON ALL EDGES AT MNa4"X 40M OPTXINL r -r lr_r a -r V-2" 10'-17' 1r -r DETAIL A Ew_VC DETAL B EW -VPC I ENDWALL FOR CIRCULAR PPE ENDWALL FOR ELLIPTICAL PIPE QUIETER Of PIPE C14.VERT D 12" W" 15" 2r OR 24. 27" OTR 30" 3S' OR 36" H r -o" r-3" r 5- 312" T -to" 4'4- L W'-0- a 0-ve W - 0'-r 0-2W O'- 0'- b 0Lr Ir -4/r V -lox" (F-2- a_m" a-3" DETAL B EW -VPC I °OrrPRECAST ENDW�ALL FOR PIPE CULVERTS 110N ROAD AND Elt4)GE sTANOARos ICE SHEET I OF 1 REVS M DATE 12" - 36" CIRCULAR AND 23" x 114" - 53" x 34" ELLIPTICAL PIPES los 1DL02 VIRAM DEPARTMENT OF TRANOMWATXN 302 VA DEQ STORMWATER DESIGN SPECIFICATION NO. 14 WET POND Table f4.6. Typical Wet Pond Maintenance Tasks and Frequency Maintenance Items ENDWALL FOR ELLIPTICAL PIPE • Mowing - twice a year • SIZE OF EUJnrJL PIPE CULVERT LSPAN x FIN) Quarterly or after major storms S x O 23"x14• 30" x 1P 34"x22" 3M x 24" 4r x 2r' 45• x 2a" 4a" x 32" 53"x34" H m; r-4" r -r' z' -a• 31-r S-3" 3'-e• S -a" L 5'-5- r -r lr_r a -r V-2" 10'-17' 1r -r 12'-71" 0 O'- C-3951" W_ 0'-4" v 0' 0'-5• 0 b W-2'0-2%- CP -2%- O-3* a- a-sr4• 0'-4- O'-sy4" °OrrPRECAST ENDW�ALL FOR PIPE CULVERTS 110N ROAD AND Elt4)GE sTANOARos ICE SHEET I OF 1 REVS M DATE 12" - 36" CIRCULAR AND 23" x 114" - 53" x 34" ELLIPTICAL PIPES los 1DL02 VIRAM DEPARTMENT OF TRANOMWATXN 302 VA DEQ STORMWATER DESIGN SPECIFICATION NO. 14 WET POND Table f4.6. Typical Wet Pond Maintenance Tasks and Frequency FOREBA Y A P P SHALL BE VDOT STD. C- RP -RAP LINED WITH GEC FILTER FABRIC UNDERL CONTRACTOR SHALL M NECESSARY MINOR ( MODIFICATIONS TO � FOREBAYS TO ENSU CONTINUE TO BE FUN( more EMBANKMENT NOTES: AFTER AN INVESTIGATION OF THE SITE's SOILS, SITE VISITS, AN ANALYSIS OF THE SURVEYED TOPOGRAPHY AND AN EXAMINATION OF THE EARTHEN EMBANKMENT (REQUIREMENTS vs. RECOMMENDATIONS), THE APPLICANT HAS PROVIDED A COMPREHENSIVE EMBANKMENT DESIGN THAT DOES NOT NEED A GEOTECHNICAL STUDY AT THIS TIME. SUCH IS THE CASE DUE TO THE PRECAUTIONARY EMBANKMENT DESIGNS PROPOSED. A SUMMARY OF THE EMBANKMENT DESIGN REQUIREMENTS ARE LISTED BELOW, MANDATING THE CONTRACTOR MEET THESE REQUIREMENTS AT A MINIMUM. THE EMBANKMENTS SHALL HAVE A COMPACTED CLAY CORE WITH A CUTOFF TRENCH & BE IN ACCORDANCE WITH THE DETAILS SHOWN ON THIS SHEET. BERMS AND SPILLWAYS SHALL BE STABILIZED WITH EC -3 MATTING & THE REMAINING DISTURBED SLOPES SHALL BE STABILIZED WITH EC -2 MATTING. ALL BERM FILL MATERIAL SHALL CONSIST OF ML, CL, SC OR GC SOILS & BE FREE OF WOOD, ROOTS, ROCKS OR ANY OTHER NON COMPACTING SOIL. COMPACTED FILL SHALL BE PROCTOR MAXIMUM DRY DENSITY ASTM D698 AND HAVE A MINIMUM OF 95% OF MAXIMUM DRY DENSITY AND 2% OF OPTIMUM MOISTURE CONTENT. ALL FILL MATERIAL AND CONSTRUCTION SHALL BE APPROVED BY AN ONSITE GEOTECHNICAL ENGINEER PRESENT DURING THE CONSTRUCTION OF THE EMBANKMENTS AND FILL AREAS. General Construction notes for Stormwater Management Plans 1. All dams and constructed fill to be within 95% of maximum dry density and 2% of optimum moisture content. All fill material to be approved by a geotechnical engineer. A geotechnical engineer is to be present during construction of dams. 2. Pipe and riser joints are to be watertight within stormwater management facilities. 3. For temporary sediment traps or basins which are to be converted to permanent stormwater management facilities; conversion is not to take place until the site is stabilized, and permission has been obtained from the County erosion control inspector. Maintenance Items Frequency • Mowing - twice a year • Remove debris and blockages Quarterly or after major storms Ll ED SPIL AY CHANNEL (>1 inch of rainfall) • Repair undercut. eroded. and bare soil areas W S.E.. 9 • Mowing Twice a year • Shoreline cleanup to remove trash. debris and 00 floatables PRO • A full maintenance inspection Annually • Open up the riser to access and test the valves - -� �� \ • Repair broken mechanical components. if needed LAND LAYMENT \ One time -during the • Pond buffer and aquatic trench reinforcement plantings second year following construction • Forebay Sediment Removal Every 5 to 7 years • Repair pipes, the riser and spillway, as needed From 5 to 25 years FOREBA Y A P P SHALL BE VDOT STD. C- RP -RAP LINED WITH GEC FILTER FABRIC UNDERL CONTRACTOR SHALL M NECESSARY MINOR ( MODIFICATIONS TO � FOREBAYS TO ENSU CONTINUE TO BE FUN( more EMBANKMENT NOTES: AFTER AN INVESTIGATION OF THE SITE's SOILS, SITE VISITS, AN ANALYSIS OF THE SURVEYED TOPOGRAPHY AND AN EXAMINATION OF THE EARTHEN EMBANKMENT (REQUIREMENTS vs. RECOMMENDATIONS), THE APPLICANT HAS PROVIDED A COMPREHENSIVE EMBANKMENT DESIGN THAT DOES NOT NEED A GEOTECHNICAL STUDY AT THIS TIME. SUCH IS THE CASE DUE TO THE PRECAUTIONARY EMBANKMENT DESIGNS PROPOSED. A SUMMARY OF THE EMBANKMENT DESIGN REQUIREMENTS ARE LISTED BELOW, MANDATING THE CONTRACTOR MEET THESE REQUIREMENTS AT A MINIMUM. THE EMBANKMENTS SHALL HAVE A COMPACTED CLAY CORE WITH A CUTOFF TRENCH & BE IN ACCORDANCE WITH THE DETAILS SHOWN ON THIS SHEET. BERMS AND SPILLWAYS SHALL BE STABILIZED WITH EC -3 MATTING & THE REMAINING DISTURBED SLOPES SHALL BE STABILIZED WITH EC -2 MATTING. ALL BERM FILL MATERIAL SHALL CONSIST OF ML, CL, SC OR GC SOILS & BE FREE OF WOOD, ROOTS, ROCKS OR ANY OTHER NON COMPACTING SOIL. COMPACTED FILL SHALL BE PROCTOR MAXIMUM DRY DENSITY ASTM D698 AND HAVE A MINIMUM OF 95% OF MAXIMUM DRY DENSITY AND 2% OF OPTIMUM MOISTURE CONTENT. ALL FILL MATERIAL AND CONSTRUCTION SHALL BE APPROVED BY AN ONSITE GEOTECHNICAL ENGINEER PRESENT DURING THE CONSTRUCTION OF THE EMBANKMENTS AND FILL AREAS. General Construction notes for Stormwater Management Plans 1. All dams and constructed fill to be within 95% of maximum dry density and 2% of optimum moisture content. All fill material to be approved by a geotechnical engineer. A geotechnical engineer is to be present during construction of dams. 2. Pipe and riser joints are to be watertight within stormwater management facilities. 3. For temporary sediment traps or basins which are to be converted to permanent stormwater management facilities; conversion is not to take place until the site is stabilized, and permission has been obtained from the County erosion control inspector. 0+50 1+00 1+50 2+00 2+50 2+75 Irfi`r� � � p 1 0' WIDE =LEV.= 335-1:-ee' 395.00' 0' WIDE PAVED WEIR w/ 5:1 SIDE SLOPES & VOOT STD. EC -1, CL. ll, 'YPE A RIP -RAP LINED SPILLWAY ;HANNEL w/ GEOTEXTILE FABRIC JNDERLAYMENT (40'Lxlo'Wx2'0) )' WIDE EMERGE 'ILL WA Y ELEV.NAAAAAAAAAAAAAAAAO 350: fj© 394.00' TRASHRACKS SHALL BE INSTALLED ON ALL ORIFICE OPENINGS (TYP.) 9" CL. ll/ RCP MULTISTAGE RISER RIM AT EV. =368:50 392.75. 771REE TWO 9" ORIFICES T ELEV. 387.20'TO BE SEALED WATERTIGHT & NE 9" ORIFICE TO BE EXPANDED TO A 12" OPENING D ACCEPT A PROPOSED i2' LONG z2" HDPE DW -FLOW STUB PIPE. STUB PIPE INVERTS ARE >7.20 & 390.00' STUBPIPE TO HAVE A TRASH RACK AT SUPPER OPENING. 3" ORIFICE OPENING FOR +VERTED P/PEAT ELEV. 385.50 TO BE SEALED 'ATERTIGHT. 'APEZOIDAL DITCH: BOTTOM WIDTH, I' DEEP w/ 3: 1 SIDE .ODES 20' (L) WITH 2' DEEP VDOT STD. -3, TYPE B RIP -RAP LINING w/ FILTER 1 BRIC UNOERLA YMEN T N. 4WIDE &DEEP IMPERVIOUS F TRENCH (TOP fVx391:00; BOTTOM WITH 1: 1 SIDE SLOPES. PAVE WEIR w 5:1 SIDE SCALE: PRE -CONS TRU TION -AX TY A RIP -RAP "=3O' Ll ED SPIL AY CHANNEL \ GRADE 100 YEAR W S.E.. 9 93.86 ERL A NEN T 401x10'Wx L 395 00 F FREEBOARD PRO DED SIDE SLOPES 2 ' (L) WITH 2 DE WATER QUALITY VOLUMF VDOT STD. E 3, TYPE B RIP AP - -� �� \ 1.14' LAND LAYMENT \ 18" CL. 1 CP L `i BARR MAPLE \ 2 ACCESS. S E __ O LF 0 .0597 \ IN V.'81.00 \ W. S. E. W. E. E - - MBA KM NTINV. \ \\ \ FOR 2 \\ A V E M E N T l= T A l l C 1 CL. lI H T. \ RASS GROUND COVER FOR \ S OPES GR ATER THAN 3: 1. k.393.13' \\ \ GRASS GRIPUND COVER TEXTILE \ LIMITED TO SI PE SLOPES SHALL NOT EXTEND INTO \\ \ 2 YEAR THE SWM F CILITY. 4 YMEN T \ \\ APPROVE SEDIMENT B S SED FOR CONSTRUCTION C GRADING TRACTO \ W S. E. N \ 392.2 ' 390 MwsE as.so' 1. , "k Ukp\ --- -- 5 WE THE RADING . �, SEDIMENT FOR AY \ HE TWO ROPOSED WITH ARMORED �E THEY GRADE OVERFLOW \ ! ! TIONAL 385 tv - FOR SAY TOP OF T110 9 FA ELEV.=384' - -�--- - E / AM WI T t LEV.-39i.00 S 12', D12" DPE- \ C OW -FLOW STUB P PE \ T L 3 380 B TTO REB84 5'x5 x18" THICK�I ELE N.'WA7ETZV ONCRETE BASEMI VOLUME (4x)=,5,88 4 cff 18" CL. ll! RCP w/ Tl ATER QUALIT VOLUME Dor sTD. EW -1 8 R - 50.00 LF @ 2.00% E INV. 1N=38200 375 I V OUT= 380.00 F J_J O O O r- O O N to rn O M W W Ln N .0 �i PMO �' PMO OMD aD rn o0 394.00' E W1.1- 0+50 1+00 1+50 2+00 2+50 2+75 Irfi`r� � � p 1 0' WIDE =LEV.= 335-1:-ee' 395.00' 0' WIDE PAVED WEIR w/ 5:1 SIDE SLOPES & VOOT STD. EC -1, CL. ll, 'YPE A RIP -RAP LINED SPILLWAY ;HANNEL w/ GEOTEXTILE FABRIC JNDERLAYMENT (40'Lxlo'Wx2'0) )' WIDE EMERGE 'ILL WA Y ELEV.NAAAAAAAAAAAAAAAAO 350: fj© 394.00' TRASHRACKS SHALL BE INSTALLED ON ALL ORIFICE OPENINGS (TYP.) 9" CL. ll/ RCP MULTISTAGE RISER RIM AT EV. =368:50 392.75. 771REE TWO 9" ORIFICES T ELEV. 387.20'TO BE SEALED WATERTIGHT & NE 9" ORIFICE TO BE EXPANDED TO A 12" OPENING D ACCEPT A PROPOSED i2' LONG z2" HDPE DW -FLOW STUB PIPE. STUB PIPE INVERTS ARE >7.20 & 390.00' STUBPIPE TO HAVE A TRASH RACK AT SUPPER OPENING. 3" ORIFICE OPENING FOR +VERTED P/PEAT ELEV. 385.50 TO BE SEALED 'ATERTIGHT. 'APEZOIDAL DITCH: BOTTOM WIDTH, I' DEEP w/ 3: 1 SIDE .ODES 20' (L) WITH 2' DEEP VDOT STD. -3, TYPE B RIP -RAP LINING w/ FILTER 1 BRIC UNOERLA YMEN T N. 4WIDE &DEEP IMPERVIOUS F TRENCH (TOP fVx391:00; BOTTOM WITH 1: 1 SIDE SLOPES. \ \ \\ SHALL RAISE THE EMBANKT 4'T �\ \\ ELEV. 395' WIT HIS AMEND NT RESHAPE THE FACILITY ACCORDI L 1 O \ V \ ELEV.= - - INV OUT=378.7 9 •o 10' GRADED ACC SS w/ 8' / PAVED SURFA E FOR PAVE WEIR w 5:1 SIDE SCALE: P OP S 8c VDO STD. EC -1, -AX TY A RIP -RAP "=3O' Ll ED SPIL AY CHANNEL FACILITY. w GE O EXTILE FABRIC � ERL A NEN T 401x10'Wx L TRAPEZOIDAL ITCH: 00 8' BOTTOM WIDTH ' DEE W/ 3: VOLUME (t.x)=4 ,8841f SIDE SLOPES 2 ' (L) WITH 2 DE WATER QUALITY VOLUMF VDOT STD. E 3, TYPE B RIP AP - LINING FILTER FABRI LAND LAYMENT \ 18" CL. 1 CP GRADED `i BARR MAPLE \ 2 ACCESS. S E __ O LF 0 .0597 \ IN V.'81.00 \ �UT= O' MBA KM NTINV. \ \\ \ FOR 2 \\ A V E M E N T l= T A l l C \ H T. \ RASS GROUND COVER FOR S OPES GR ATER THAN 3: 1. \\ \ GRASS GRIPUND COVER C A \ LIMITED TO SI PE SLOPES SHALL NOT EXTEND INTO \\ \ THE SWM F CILITY. \ \\ APPROVE SEDIMENT B S SED FOR CONSTRUCTION C GRADING TRACTO \ \ \\ SHALL RAISE THE EMBANKT 4'T �\ \\ ELEV. 395' WIT HIS AMEND NT RESHAPE THE FACILITY ACCORDI L 1 O \ V \ ELEV.= - - INV OUT=378.7 9 •o 10' GRADED ACC SS w/ 8' / PAVED SURFA E FOR TH 0�� SCOTT R. COLLINS Lic. No. 0357913" t'l�icll'I ,w4`' %� &IONAL t a LL LL --- - Z(y) rn � N co I C) WCy) N WQ W J_ W I- 0 Q U W r UlY U) zW 0L � v! I-^ J� W W �Q 0 V 0 N u U C C c ° v c c c C e a ° C u ° c S c I c C c 1 It, c c C L C T C C C c z T 1 c v c c c T I E N ` 1 a 4 L t Z ' ° W C a G , 1 0 ° ° C z ` W zc Oc F--4 Z s U` J C Q f 0- U c C L1 Z c sc LU c U) UJ r V n T 2 a zzz Q ° c- 00 T C [F --II � v / W ° i 1sa-4 Q C { H o�T � / c M s 1 C W O C Q LL V 1 G LL � v C W c u c W z ° O ° 1 ° %� J C V / ~ U ~ u Lu ir-, UJ a c T JOB NO. a 092028 G SCALE c i AS SHOWN c t SHEET NO. � SWM -2 °s S F -AX MAINTENANCE O SWM DAM FACILITY. IN=AL `INV 00 VOLUME (t.x)=4 ,8841f WATER QUALITY VOLUMF 1 O, OP\ PROVI D= 46 5 \ POND TRAIL 8c 10' \ GRADED MAPLE \ 2 ACCESS. S E __ \�� \ APPROVED \ \ \ SHEET S-3 _ 18'� OP \ \\ \ FOR 2 \\ A V E M E N T l= T A l l C TH 0�� SCOTT R. COLLINS Lic. No. 0357913" t'l�icll'I ,w4`' %� &IONAL t a LL LL --- - Z(y) rn � N co I C) WCy) N WQ W J_ W I- 0 Q U W r UlY U) zW 0L � v! I-^ J� W W �Q 0 V 0 N u U C C c ° v c c c C e a ° C u ° c S c I c C c 1 It, c c C L C T C C C c z T 1 c v c c c T I E N ` 1 a 4 L t Z ' ° W C a G , 1 0 ° ° C z ` W zc Oc F--4 Z s U` J C Q f 0- U c C L1 Z c sc LU c U) UJ r V n T 2 a zzz Q ° c- 00 T C [F --II � v / W ° i 1sa-4 Q C { H o�T � / c M s 1 C W O C Q LL V 1 G LL � v C W c u c W z ° O ° 1 ° %� J C V / ~ U ~ u Lu ir-, UJ a c T JOB NO. a 092028 G SCALE c i AS SHOWN c t SHEET NO. � SWM -2 °s S F 0X n gs 4 LA 8 �I o 2 2 x 2 c. � V