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HomeMy WebLinkAboutWPO201600042 Plan - VSMP Minor Amendment 2017-04-11STONEVVATER SUBDIVISION VICINITY MAP GENERAL NOTES ,,, y ,,, 1. OWNER & DEVELOPER: CUL VERT RIO ROAD HOLDINGS, L.L.C. SWM -2 CORPORATE ADDRESS: SWM -2A 1900 ARLINGTON BLVD., SUI TE A DROP INLET & STRUCTURE NO. CHARLOTTESVILLE, VA 22903 BENCH MARK STREET ADDRESS: 590 RIO ROAD EAST CHARLOTTESVILLE, VA 22903 CLEARING LIMITS TREESDALE LP 1821 A VON ST. EXT, SUITE 200 PROPOSED PA VEMENT CHARLOTTESVILLE, VA 22902 VDOT STANDARD STOP SIGN 2. ENGINEER: — — — — 200— — — -" COLLINS ENGINEERING DEPTH OF EC -3A DITCH 200 GARRETT STREET, SUITE K PROPOSED CONTOUR CHARLOTTESVILLE, VA 22902 240.55 TELE: 434-293-3719 E—MAIL: Scott©coll%ns— engineering. com TBC DENOTES TOP/BACK OF CURB CONTACT MR. SCOTT COLLINS, PE 3. TAX MAP NO: 061A2-01-00-00080 (RIO MAGISTERIAL DISTRICT) DEED BOOK 4112, PG 396 TAX MAP NO: 06100-00-00-18200 (RIO MAGISTERIAL DISTRICT) DEED BOOK 3934 PG 235 4. ZONING: R-4 (RESIDENTIAL) ENTRANCE CORRIDOR: NONE 5. WATERSHED & DRAINAGE DISTRICT- MEADOW CREEK WATERSHED 6. BUILDING SETBACKS. (NOT APPLICABLE TO THIS AMENDMENT) FRONT- 25 FEET MINIMUM SIDE 15 FEET MINIMUM BACK: 20 FEET MINIMUM 7. DENSI TY.- 48 UNITS (TOTAL) (NOT APPLICABLE TO THIS AMENDMENT) 34 DETACHED SINGLE FAMILY UNITS 14 ATTACHED TOWNHOUSES 48 UNITS / 13.01 AC. = 3.664 UNITS/AC. 8. PLANNED LAND USE SUMMARY.• (NOT MODIFIED WITH THIS AMENDMENT) TOTAL PARENT PARCEL AREA: 13,101 AC. ACREAGE IN RESIDENTIAL LOTS: 6.94 AC. (53.07) 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: 4.03 AC. (30.87) ACREAGE IN NON—OPEN SPACE TO BE RESERVED IN DEED FOR COMMON USE OF LOT OWNERS IN THE SUBDIVISION: 0.111 AC. LOTS 1-34: DETACHED SINGLE—FAMILY HOMES WITH ATTACHED GARAGES FACING STONEWA TER DRIVE AND STONEWA TER CIRCLE LOTS 35&36: FUTURE SITE FOR 14 TOWNHOMES SERVED BY NEW PUBLIC CROSS—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. TMP 61A102 -02A, N/F STONEHENGE HOMEOWNERS' ASSOCIATION, INC. D.IB. 570, PG. 278, D.B. 570, PG 266 PLA T TMP 61-183, N/F ALBEMARLE HOUSING IMPROVEMENT PROGRAM, INC. D.B. 2897, PG. 464, D.B. 665, PG. 147 PLAT, D.B. 454, PG. 654 PLAT CURRENT USE: RESIDENTIAL (COMMON AREA AND/OR VACANT) STATE ROUTE 631—RIO ROAD EAST VARIABLE WIDTH RIGHT OF WAY 11. DA TUM AND BENCHMARK REFERENCE. BOUNDARY, EASEMENTS, AND PLAT DATA BASED ON SURVEYS BY - KIRK HUGHES & ASSOCIATES 220 EAST HIGH STREET CHARLOTTESVILLE, VA 22902 12.CRIT1CAL SLOPES (WAIVER APPROVED WITH SUB 2005-241): TOTAL AREA WITH CRITICAL SLOPES 3.'. 17 AC. 7 OF PROPERTY WITH CRITICAL SLOPES: 2,4.57 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 13.MAXIMUM BUILDING HEIGHT- 35 FEET (NOT APPLICABLE TO THIS AMENIOMENI) 14.PROPOSED IMPERVIOUS COVER ON SITE: 6.32 AC. (PER APPROVED PLANTS, NOT MODIFIED WITH THS AMENDMEN T) 15.NO LUMINARIES PLANNED FOR THIS DEVELOPMENT SHALL EXCEED THE 3,000 LUMEN LIMIT. THERE ARE ALSO NO PROPOSED STREET LIGHTS 16.CONTRACTOR SHALL VERIFY LOCATION AND ELEVATION OF ALL UNDERGROUND UTILITIES SHOWN ON 'LANS IN AREAS OF CONSTRUCTION PRIOR TO STARTING WORK. CONTACT ENGINEER IMMEDIATELY IF LOCATIOI OR ELEVATION IS DIFFERENT FROM THAT SHOWN ON PLANS, IF THERE APPEARS TO BE A CONFLICT ANL UPON DISCOVERY OF ANY UTILITY NOT SHOWN ON THE PLANS. 17.COLLINS ENGINEERING SHALL NOT HAVE AUTHORITY OVER CONTRACTOR'S WORK, SAFETY PRECAUTIOl , SCHEDULES, OR COMPLIANCE WITH LAWS AND REGULATIONS. WE SHALL NOT ASSUME RESPONSIBILI TYT-OR ANY CONSTRUCTION STARTED PRIOR TO PLAN APPROVAL. X \X VSMP PLAN AMENDMENT RIO MAGISTERIAL DISTRICT ALBEMARLE COUNTY, VIRGINIA � //ZL/S IT 200' , j W, -.3 8 ti QTf0 ,L/OTo LO`T_ e \ L`QT k07,T, / rt / DEVELOPER/OWNER RIO ROAD HOLDINGS, L.L.C. 1900 ARLINGTON BLVD., SUITE A CHARLOTTESVILLE, VA 22903 TREESDALE LP 1821 AVON ST. EXT, SUITE 200 CHARLOTTESVILLE, VA 22902 COLLINS ENGINEERING 200 GARRETT STREET, SUITE K CHARLOTTESVILLE, VIRGINIA 22902 PHONE: 434.293.3719 r _. � `< � a r 'v4� �J,. �. �, ',.r;' ,,` � ' tf.+"\ � �, ���,��4'}, . i ,.r ,� � `•'� � t) -� \3`�,?> lt_��'i ?rE''��r«!!'�'-�I}i��i �T : "a\.,v-*�s'`l,C,.'�•Z�"',,�`.p�` �.s:F,>i. ?\r�`� �% ,'i�`�;`�`I��„��/\� `' /fy,r��1�yf},``f�•' �..._.__•,�• ,l / . C%`f:�,..:.`t' `{f,� .'� ✓�/�s'��} sr�-' 4✓.'�,°. Y ��ir"�/�� rsrr,�rrp `{ r.�"M1I�_�yy_' �...✓ J..t,f � / fs ;,"' �r `r_,fIIf.�' n1t11 � s_+tre�fr,r,r P,t- M•-.�,� - t {1..,_%�-.-. ` �' / `,Y f�/ � � vv' `!`', `" r" ` I _ "`✓r%.'�� o'f't. � � r/' ;t �-�P, � 1' �+ u� , �%`'� 'n i jr�:"'�"' ,1,r % �; ✓ /Jr .%- t "� "L yj( rr, t l`1 r!! l ;'y� ,a. t v.w.. ."( jy, ' ;' t \..... 1 •C, S T1�.cf....�- = ( l l It °� y.' �,�f 1 Zj rr jr J of }f ( fr1 tf j `�` t .-f..`l' �; ,,T,C:� r -fit ff f flr f rAI �r !, ✓{ exj ` ` -r Q%rf7•\.%' f 11 .,ti, ' �,r { tt } i t"�4�T`' . 1//rt �a 1!1 ..-__- fr .11 t, ` �,•° j` Jf, �,— '_.! k "M ,,,•-'"" ��`�'�`�r `�i RN ;, t R1'2stt a yLv� er�.a;�,eS°i ,s"` 1 _ I..w J �._� �r?'� Via, y 4��.--:_._n-�:.�\ � � � r �� ✓ �, if / r' ^,, ���,,��„���? .:fZ � It �<��� Ai y _, y P til rr 1 •... ✓ _~ ic...__..? -< f' t f . 0 iyS - r I ✓ i f i5 �{ If jr' 1I r�r f r .0 4 ROADS A LEGEND EXISTING CULVERT ,,, y ,,, EARTH DITCH CUL VERT COVER SWM -2 STORMWATER MANAGEMENT CALCULATIONS SWM -2A DRI VEWA Y CUL VER T DROP INLET & STRUCTURE NO. A BENCH MARK CURB CLEARING LIMITS CURB &GUTTER PROPOSED PA VEMENT T VDOT STANDARD STOP SIGN EC -3A DI TCH — — — — 200— — — -" EXISTING CONTOUR DEPTH OF EC -3A DITCH 200 PROPOSED CONTOUR EC -2 DITCH 240.55 PROPOSED SPOT ELEVATION .�� TBC DENOTES TOP/BACK OF CURB DEPTH OF EC -2 DITCH TIB DENOTES TOP OF BOX Sheet List Table Sheet Number Sheet Title T-1 COVER SWM -2 STORMWATER MANAGEMENT CALCULATIONS SWM -2A STORMWATER MANAGEMENT— SEDIMENT BASIN DEWATERING 1THE PROPOSED CHANGES ASSOCIATED WITH THIS AMENDMENT ARE LIMITED TO THE SUBSTITUTION OF AN ENHANCED EXTENDED DETENTION BASIN (50% PHOSPHOROUS REMOVAL RATE) WITH A TYPE III RETENTION BASIN (50% PHOSPHOROUS REMOVAL RATE). NO OTHER MODIFICATIONS ARE PROPOSED AND ADDITIONAL IMPERVIOUS AREAS ARE NOTADDED. THE SWM FACILITY CHANGE 7AKES PLACE WITHIN THE PREVIOUSLY APPROVED SWM EASEMENT AND GRADING REVISIONS ARE LIMITED. THE AMENDED FACILITY PROVIDES THE EQUIVALENT WATER QUALITY TREATMENT AND THE F=ACILITY RELEASES LESS RUNOFF THAN PREVIOUSLY APPROVED FROM A STORMWATER QUANTITY STANDPOINT. THE FACILITY DOES NOT REQUIRE AN AQUATIC BENCH BECAUSE IT IS A TYPE II (RETENTION BASIN WITH A (MEAN WATER SURFACE AREA LESS THAN 20,000 sf. IN ACCORDANCE WITH COUNTY ENGINEERING AND DEQ DIRECTION, 'GRAN DFATHERED' VSMP PROJEC'S CAN CONTINUE TO BE'GRANDFATHERED' PROVIDED THE AMENDMENTS/MODIFICATIONS DO NOIRESULT IN AN INCREASE IN THE AMOUNT OF TOTAL PHOSPHOROUS LEAVING EACH POINT OF DISCHARGE, OR RESULT IN AN INCREASE IN THE VOLUME OR RATE OF: RUNOFF. CONSEQUENTLY, THE PFDPOSED AMENDMENT WILL REMAIN 'GRAN DFATH ERED'. d..:;;,„.t�,..='.,✓� ..� eEw'..r.,t',�`:...�>..5,..�'.-+4..a�a f j=,....�+,...�'t,._ �,.�,...+a.,.� r�.�%., .:°.,,+t, �...i....�.. x,,.ro _,_"�..a`a.`,J_.r{.�,...�,..,?.._r,...-W ��,..�_�._"t .A:_ ._ APPROVED by the Albemarle County Community Development Department Dote File;L 2 I certify that theo final plans meet the requirements of the Albemarle County Zoning Ordinance, the Water Protedon Ordinance, the Subdivision Ordinance, and the Design Standards Manual, and are prepare(in accordance with the Engineering Expedited Fteview Final Plans Checklist. Signature Date DEPAPTAffT OF COMMUNITY DEVELOPMENT DEPAR TMEIT OF PLANNING & COMMUNITY DEVEL OPMEN T ENGINEERIIa BUILDING (,FICIAL FIRE OFF/CI L ALBEMARL COUNTY SERVICE AUTHORITY VIRGINIA C PAR TMEN T OF TRANSPOR TA TION SH 0 - SCOTT R. COLLINS Z` Lic. No. 035791,E SECTIO.N�A-9, TYPICAL Gk-�FHICAL DETAILS I I I . I --�,,� -_ Homogenous fill I . I � I � - 1 I � I � . 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I .... � . :'.-.`.'-."__' ­ , I �, ftKMANENT STORM APPROVED WATER QUALITY VOLUMES (SHEET SWM -2) Proposed Impervious Areas ')75,302 sf Water Quality Volume (Ix) 11,471 cf APPROVED WATER QUANTITY OUTFLOWS (SHEET SWM -2) 2 -year Flow 5.71 cf,s I 0 -year Flow 12.93 cfs F of Freeboard Achieved YES EW -1. 1 APC L �m -0 i A-1 1 __ j I x il-t ION A --J EACH WAY.EACH FA( NOTES. I. CONCRETE TO BE 4000 PSI MINIMUM COWRESSIVE STRENGTH. SECTION A -A 2. IF PIPE IS TO BE SKEWED THE OMING WILL BE ANUSTM TO ACCOMMODATE ANGLES LIP TO 45". 3. REINFORCING STEEL N ACCORDANCE WITH ASTM A-615 (REIWORCING BARSJ. � . . I 4� PIPE OPENINGS IN PRECAST ORANAGE UNITS SHALL NOT EXCEED 4 INCHESi AT ANY GIVEN POINT 13ETWEEN THE PIPE AND THE PRECAST UNIT. A DO NO 13EVEL 1! ... INVERT 5. DIAENSIONS SHOWN ARE MIMLIM. ACTUAL MEASUREkfNTS MAY VARY WITHI I A MAII&IFACTURIERIS TOLERMCE. . 6. IN NO CASE SHALL TOP OF ENDW&L PROJECT ABOVE FILL SLOPE, DITCH SLDPE, OR SHOULDER , , . ) 7. HEADWALL TO BE BEVELED IN ALL AREAS EXCEPT WHERE A CONFLICT WrITH BEVELED WITH INVERT OR WINGWALL OCCUR. a. BEVEL EDGE IS REQUIRED ON THE HEADWALL AT THE WILIET END OF THE (CLXVERT. SHA -E TO BE ___ HEADWALL AT OUTLET END MAY BE EITHER SQUARE EDOE OR BEVELED . ;.ill 9� Y4" CHAMFER MAY BE PROMED ON ALL EDGM AT M"FACTURER'S OPTION. DETAL A W-1PC I E i I CONCRETE STRUCTURE DIMENSIONS INSIDE STRUCTURE 01MENSION I I INfFNSIC)N I RUCTURE 0 � __ I I AVAI�A.RLEOPTICINS ONG FOR OVERHANC - CROSS BRA I HDPE ANT14ORTEX PLkTE- � COTE- ri RMY11 V .. APPS EBY- TA: DE I'�l-----�------,-------",�,�--l-�l,!--�"-----,-"�-I'll.11-1--�l----- - AMENDMENT WET POND VOLUMES Elevation Area of Contour Volume 380 5499 0 381 6255 5,873 APPROVED SED0/IENT BASIN VOLUMES PLANT LIST - POND LANDSCAPING 20,078 & SWM 385 10,224 (Used for construction of existing sediment basin) 1 385.75 11,123 [7:j�,326 �] - - I 386 11,435 49,146 387 12,806 61,260 388 14,205 Elevation Area of Contour Volume Notes Description Common Name Quantity Caliper Slize AMENDIIIE NTWATER QUALITY Comments Water Quality Volume Required (4x) 383 8,920 0 TREES maximum) Per 1999 VSMH, Chpt. 3, page 3.06-9, - Retention Basins providing a 50% phosphorous RR do . not require aqua tic benchs if the basin suiface areas do not exceed 20,000sf. 384 9,993 9,451 CD Cedrus Deodara I 0 -year Flow 4 5'- 6' h t. B&B, multi -trunked -_�?.I'..).L "'V- I] � �' I 2: 5 : V 0 I- I 11 �vl E C 375 1 1- (", X) = I, - , 8 , I _56'i00 LF . i I ,,_�P 2.0n��'111 � MG Magnolia Grandiflora 'Little Gem' - Little Gem Magnolia 2 571__�h t. B&B, multi -trunked �___ 4f-"" h' I V. ot (F=_- 111�1341.). or",; r- -r 386 12,238 31,645 CL Cupressus X Lelandii - Leyland Cypress 26 - 5'- 6' h t. . (D _J LJ ILIJ 388 14,606 58,454 MV Magnolia virainiona Sweetbov Mccinolia 2 - 5'- 6' h t. B&B. multi -trunked LLJ ILL I I � I ce I JV Juniperus Virginiang Eastern -Red Cedar 8 - 5'- 6' h t. Strona central leader 9 390 17,075 90,103 . ci Crvotomerla Japonica _' . Cryptomeria 2 5'- 6' h t StrQnq central leader 391 18,760 108,013 SHRUES I 5 iR LU � - UJ i�� � IN �j�r �i�� E 5 - ` I CH Clethra alnifolia 'Hummingbird - Hummingbird Summersweet 16 - At time of planting CS Cornus sericea Red Twig D gwood 15 - At time of planting HQ Hydrangea querclifolla Ockleaf Hyd angeo 4 - 18" min. 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I .... � . :'.-.`.'-."__' ­ , I �, ftKMANENT STORM APPROVED WATER QUALITY VOLUMES (SHEET SWM -2) Proposed Impervious Areas ')75,302 sf Water Quality Volume (Ix) 11,471 cf APPROVED WATER QUANTITY OUTFLOWS (SHEET SWM -2) 2 -year Flow 5.71 cf,s I 0 -year Flow 12.93 cfs F of Freeboard Achieved YES EW -1. 1 APC L �m -0 i A-1 1 __ j I x il-t ION A --J EACH WAY.EACH FA( NOTES. I. CONCRETE TO BE 4000 PSI MINIMUM COWRESSIVE STRENGTH. SECTION A -A 2. IF PIPE IS TO BE SKEWED THE OMING WILL BE ANUSTM TO ACCOMMODATE ANGLES LIP TO 45". 3. REINFORCING STEEL N ACCORDANCE WITH ASTM A-615 (REIWORCING BARSJ. � . . I 4� PIPE OPENINGS IN PRECAST ORANAGE UNITS SHALL NOT EXCEED 4 INCHESi AT ANY GIVEN POINT 13ETWEEN THE PIPE AND THE PRECAST UNIT. A DO NO 13EVEL 1! ... INVERT 5. DIAENSIONS SHOWN ARE MIMLIM. ACTUAL MEASUREkfNTS MAY VARY WITHI I A MAII&IFACTURIERIS TOLERMCE. . 6. IN NO CASE SHALL TOP OF ENDW&L PROJECT ABOVE FILL SLOPE, DITCH SLDPE, OR SHOULDER , , . ) 7. HEADWALL TO BE BEVELED IN ALL AREAS EXCEPT WHERE A CONFLICT WrITH BEVELED WITH INVERT OR WINGWALL OCCUR. a. BEVEL EDGE IS REQUIRED ON THE HEADWALL AT THE WILIET END OF THE (CLXVERT. SHA -E TO BE ___ HEADWALL AT OUTLET END MAY BE EITHER SQUARE EDOE OR BEVELED . ;.ill 9� Y4" CHAMFER MAY BE PROMED ON ALL EDGM AT M"FACTURER'S OPTION. DETAL A W-1PC I E i I CONCRETE STRUCTURE DIMENSIONS INSIDE STRUCTURE 01MENSION I I INfFNSIC)N I RUCTURE 0 � __ I I AVAI�A.RLEOPTICINS ONG FOR OVERHANC - CROSS BRA I HDPE ANT14ORTEX PLkTE- � COTE- ri RMY11 V .. APPS EBY- TA: DE I'�l-----�------,-------",�,�--l-�l,!--�"-----,-"�-I'll.11-1--�l----- - AMENDMENT WET POND VOLUMES Elevation Area of Contour Volume 380 5499 0 381 6255 5,873 382 7050 12,521 383 8,075 20,078 384 9,106 28,664 385 10,224 38,323 1 385.75 11,123 [7:j�,326 �] - - I 386 11,435 49,146 387 12,806 61,260 388 14,205 74,759 389 15,371 89,543 390 16,561 105,506 391 17,777 122,671 AMENDIIIE NTWATER QUALITY VOLUMES Water Quality Volume Required (4x) 45,884 cf Water Quality Volume Provided 46,39-6 cf (Below MWSE: 4' depth min. & 6' depth maximum) Per 1999 VSMH, Chpt. 3, page 3.06-9, Type 11 Retention Basins providing a 50% phosphorous RR do . not require aqua tic benchs if the basin suiface areas do not exceed 20,000sf. � _I � - 7_.. 3,,',,' - 1 / CON'GiRic � 1,5L i , 1 I .? 11 AMENDMENT WATER QUANTITY OUTFLOWS 2 -year Flow 3.87 c f's I 0 -year Flow , 12.46 ct -S F of Freeboard Achieved YES DETAIL B - 124.1112 I Table 144 Typical Wet Pond Maintenance Tasks and Frequency ENDWALL FOR ELLIPTICAL PIPE ___ - , , � : 1. ::::� . I.. i .... I ... �!::�:::::: �X i �!::� :..:�::�:::� ::�:�:::�:: �� � .... :� :: :::�:::�:�::::: �:: ! : : � i ]:::. �, :�: � ..:� � � Main �eltems � � �: � � � 1 . :�::::::: tenqn, . I ::: ::::::: . I .- 1. ­ � I., - ­ I :. � I . I :��:�::�::��: 11 . �: �:;;!;�; C�y::::��::�::��:�r: . . : - uen IF ::� �. ... -1 r ....... ,� : I �:�.:�:�: ... : ::::::::: ... :;Jrr,e� ��:: i:� �::::: �: .: . DIAMETER OF PIPE CULVERT iWAS 79,`5 -, I "-/ IRA t' Sfi'ALI ... 1----- D 12" 1 15" 1 18" 121" OR 24"127" OR 30"13N' OR 36" H 2`0" 2`21" T-6- 31-2.1 Y-110" 41-4- - L 41-0t. 5'-O" W -O" ­(r .0-U. 12'-(Y' ' O._J/.. 7 4 O' -W4" 0`2" _a I 0'-2yg" 1 0-31/4" O`J)f4" 7 01_1�1 - 0-4/4" 0-4/1" 0`2" 1 0`21/r" O`Y ' DETAIL B - 124.1112 I I � SPECIFICATION - XVMT RMR04M ROAD NO BRIDGE STAWARDS PRECAST ENDWALL FOR SHEET 1 EETREVISION DATE ' 12" - 36" CIRCULAR AND 23" x 14" - 53" x 34" ELLIPTICAL PIPES 105 VIRGUNIA DEPARTMENT OF TRA1,11"TATION 302 101,02 - - VA DEQ STORMWATER DESIGN SPECIFICATION NO, 14 WET POND Table 144 Typical Wet Pond Maintenance Tasks and Frequency ENDWALL FOR ELLIPTICAL PIPE ___ - , , � : 1. ::::� . I.. i .... I ... �!::�:::::: �X i �!::� :..:�::�:::� ::�:�:::�:: �� � .... :� :: :::�:::�:�::::: �:: ! : : � i ]:::. �, :�: � ..:� � � Main �eltems � � �: � � � 1 . :�::::::: tenqn, . I ::: ::::::: . I .- 1. ­ � I., - ­ I :. � I . I :��:�::�::��: 11 . �: �:;;!;�; C�y::::��::�::��:�r: . . : - uen IF ::� �. ... -1 r ....... ,� : I �:�.:�:�: ... : ::::::::: ... :;Jrr,e� ��:: i:� �::::: �: .: . 1. . ;,,� I :,:W _P .. i � _� A Y 7_(_,1P Of` - � I iWAS 79,`5 -, I "-/ IRA t' Sfi'ALI ... 1----- SIZE OF ELLIPTICAL PIPE CULVERT (SPM x RISE) Quarterly or after major storms ,,1-F01 I � V ','.�,,, "Ir -I , ,. '41,1,,` Vhl­)TIW-4�715' I L, . r ; 'L, � - ' � // , , 1, �, r. , /IT ,, .57" , I I AN IFL 'El IV' = 1-1 01 I", (�111 �' -, S x D V311 x 14" 30" x 19" 34" x 22" 35' X 24" 42" x 27" 4511 x 2911 4V x 32" 1 53" x 3V H 11 _V. 2'-,V' 2--7-1 2`9" 3`11'. 3`3" I Y -V 3`5" L 5`5" 7'-T� 81-6.t 9'-2" 1113--Z" 101-111, 12.-T. 12-11" a 0`2V2" 0'-3V4" O' V12 " 0`4" W -4V2" 0'-4)F4" 0`15" 0`51/2" b 0`2" (11-31. 0`2V2" 0`2)1�' 0'-3Y:t" 0`3%- 01-41- 0 1-4y'?, I � SPECIFICATION - XVMT RMR04M ROAD NO BRIDGE STAWARDS PRECAST ENDWALL FOR SHEET 1 EETREVISION DATE ' 12" - 36" CIRCULAR AND 23" x 14" - 53" x 34" ELLIPTICAL PIPES 105 VIRGUNIA DEPARTMENT OF TRA1,11"TATION 302 101,02 - - VA DEQ STORMWATER DESIGN SPECIFICATION NO, 14 WET POND Table 144 Typical Wet Pond Maintenance Tasks and Frequency I , I ------- _,____� ___ - , , � : 1. ::::� . I.. i .... I ... �!::�:::::: �X i �!::� :..:�::�:::� ::�:�:::�:: �� � .... :� :: :::�:::�:�::::: �:: ! : : � i ]:::. �, :�: � ..:� � � Main �eltems � � �: � � � 1 . :�::::::: tenqn, . I ::: ::::::: . I .- 1. ­ � I., - ­ I :. � I . I :��:�::�::��: 11 . �: �:;;!;�; C�y::::��::�::��:�r: . . : - uen IF ::� �. ... -1 r ....... ,� : I �:�.:�:�: ... : ::::::::: ... :;Jrr,e� ��:: i:� �::::: �: .: . 1. . ;,,� I :,:W _P .. i � _� A Y 7_(_,1P Of` - � I iWAS 79,`5 -, I "-/ IRA t' Sfi'ALI ... 1----- * Mov,lnq - twice a year Quarterly or after major storms ,,1-F01 I � V ','.�,,, "Ir -I , ,. '41,1,,` Vhl­)TIW-4�715' I L, . r ; 'L, � - ' � // , , 1, �, r. , /IT ,, .57" , I I AN IFL 'El IV' = 1-1 01 I", (�111 �' -, 3�7 1, SJ -16,1 t FT) �)�,\,j � iN , �_­­ "! � � I 11 � -- - - � � � ALL uVil,11:71,S' 1 I. � I i . ­� \__ * Remove debris and blockages (;> -1 inch of rainfall) I \ ��', ; �� I , I * Repair undercut, at -oded, and bare soil areas I _ -_ "" \ i i / I --- ____ --- _____ - - -_ - - - - ____ * Mowing -_ -_ _____ - -_ T,vice a year __ " -1 I A . I : 4 � / I " i � * Shoreline cleanup to remove trash, debris and -'- I , �, 13 1 1 floatables . I " �_ "', , � t ­__ __________ � ------ � --t - - - - 0 A full maintenance inspection i i Annually I �, 't I , , I FORERA ', ,S', ,L/I I IM/,1 `/ I i �. 1 1-1-1 1 i ,� __ - �, _­_' i 1 p * Open up the riser to access and test the valves I E-LEV, =J86.00. S/41/iLL ?� l -I- V4 --- L N ,, 0i'v! /70'reEB/I I � i # Rep air broken rnechani�al cor�ponents, if needed _ _ I I I _3P7LL*1lY - 13C ,,,/,j3 C) r _,,, 1/ � L -,C I -) -_ 1 CL� I/ 1-1 T �!,, ­_,'! � r -/- � I - ,,, -- - cj­ 1 � _I � - 7_.. 3,,',,' - 1 / CON'GiRic � 1,5L i , 1 I .? 11 One time -during flie I _;(TL/ F R/P -RAP LINED' IiV)ITI! O,EO)�F - I � I � __ - - 1 7/11111111T. W11.11�7�7 0 Pond buffer and aquatic bench reinforcement plantings ____ -------- - - -_.___1_ second year followinct construction ___­____,_____ Fit 7EF' IEXIBRIG' ,UNDERL L -_ - -A "r�Mt-EN 1 0 Sediment Removal Every 5 to 7 years Forebay ... ­ . ­­___­­_­­­ -_- ----I_-_- From 5 to 25 years - * Repair pipes, the riser and spillvvay, as needed ____L______._ .- . 1 mo EMBANKMENT NOTES: AFTER AN INVESTIGATION OF THE SITE's SOILS, SITE VISITS, AN ANALYSIS OFTHE 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 G EOTECH N ICAL STU DY AT TH I S TI M E. S LICH I S TH E CASE DU E TO TH E P RECAUTI 0 NARY E M BAN KM ENT 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 I SHALL CONSIST OF ML, CL, SC OR GC SOILS & BE FREE OF WOOD, ROOTS, ROCKS CRANY OTHER NON I COM PACTI NG SOIL. COM PACTED FI LL SHALL BE PROCTOR MAXI MU M DRY DE NSITY ASTM D698 AN D 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. I i i I _� � - i Z , �- ,'� ,E:�'r,'Lt - - - C 01V _5 7 iTL/ C T1 G ) A/ . I . . -f� ; j � " it ,,� -K'A oE I i��,__) 0 ?EA r'? 1 zvl/ S. E =F,87=70 i \ t I � - i - � I � - 1� t i (1. _136- .)F FF,=2'70,ARD P,'�,O� i � I I I i � I 395 1 / 1-1 � 1,01 i 4 _= , - _­ ------------------- I 1�11z�________ , I i � t I � 1 -,, - - I 0 YEA R � - I / � ! � I � i I l4I,1, 5'. F_. &-66: � i � I - � ! � \ 1 I t I � 926': � � I � � I . � \ ! 3 =K� NT .., . I i I � 1-1 4 I i I I ,� i ___ � �2 ?" i ,I? --- 1________, -7 ... �� I ��, ,- F . , �r - � "� __ �0_,-nl� t __� � I � : � 1 1 " 388�81-., I I I I i . 1-1 i 1 \ =�A ­­_ . i t " 390 ­­_ . �, I - . I - I ,- . - __ -----1. - -..----- .--,.-.--,.�----,-.------------�--,�-�--�- __ 'k __ \ - - , __i� / � "' , , , , , �, / t ___ - ______ - __ - - - _­ _­­ - - 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. , . I - . i ---V-,---,- 11 � I—- I _' ` I _OFI�:77/1 ,,,, "?, --�, I,, i � � 1__1'EL)/,`1j`riVT !� . __ It � i - . � ::::: . � --------- . � � - C :::::: .... � ­­­ ........... . � t I 1,4// Y _'bf il�l RE D � � �:::::: � ill , 41"I'L 71 -,�-Z- - - : :: COP.ITRAtCTOR SHALL REMOVE F -Ili) INA1. 1 j5�- ._ i I I z "::!,. :­ - __11111. I \ C I 11 � 11 I " f) L.'': i .1 .... 11 I ____ ___ � 1, , I VL �)��- L. � I't"i i ,:: � � TNST'ALL/i �' IODII:11.',�,-, VD01' Mri-I ATT,H1'EE_ , I i 1\ , �: � � ���;:;: 14 � .� " i - ": �! � ,. , - I ::�:::�::�:�: - I \ 4 ::::::::: I . ASBUIL:r*PTE's OUTLET. CON FRASLTOR i 11 I \ ::::::::: , -- f I ::::::::::: i --------- i ::::: ::::: I - -_ ,,rn 1 � ,. __ i \ ::::::::;::: �:::: r SHN-L I IE'Lo FIT'IHIIS frISTALLATTON �,,�PL t, ii, 141 1 � � :: �:!::::::::: _� , - rllci7'.11�` i " ADOI`� I ,�'13'r � EtAi-i - � 3't"- ,g,- c-ul � ::;: :: � I _' . fl ­v, � � I 1 tltil�; ::!�� i - Jtb,b" ::: -1 - - �Y, MM -AI 3 8 ,P -1 -1 ", I 1�1 I '44 t L - 4 '�_ - ::::::::::: _L, l(h fihtFV1J1 20' OUTFALL NPE. Pit _tll - - - -_ - I ____ -_ 4, UILI-17-173 1 � -_ :::::::::::::: C ' ` 77 _ 1 ! " - F � � t i ! I � i t i i I \ - , Sf,1,1P1 ;;:i0 9% j,01W CL. Ill R CP [20,00 I I � r 1 0 - I ______ __ lrL , __ - -37 --- 7- I , I ------- _,____� -- - . I 1,11 ,,,,,,_ 'J",f'r, _7,r-- 1, P,1=386,93 & INV� � I MV; T , .. .,ru,=..61101� a) - 1. . ;,,� I :,:W _P .. i � _� A Y 7_(_,1P Of` - � I iWAS 79,`5 -, I "-/ IRA t' Sfi'ALI ... 1----- 1 -1 � i 1: /r SHALL OUTFALL 12" AB(NE MINSE I ,�J ,,1-F01 I � V ','.�,,, "Ir -I , ,. '41,1,,` Vhl­)TIW-4�715' I L, . r ; 'L, � - ' � // , , 1, �, r. , /IT ,, .57" , I I AN IFL 'El IV' = 1-1 01 I", (�111 �' -, 3�7 1, SJ -16,1 t FT) �)�,\,j � iN , �_­­ "! � � I 11 � -- - - � � � ALL uVil,11:71,S' 1 I. � I i . ­� \__ : :� � ::: \ \ ID ) -1" \ >1 \ (-4 0 "L x 1 O'Wx , \ \ \ ��', ; �� I , I - C,P ­ I � EMINGS! j r "" \ i i / I I i I /1, , " -1 I A . I : 4 � / I " i � 4 I � . � I 1`111 Tim r111 MA 7171,Ni I , k,!Jli :i � 1 A,-, .�__ , �, 13 1 1 EU-i,fl=300' I, I "I ; .. . � ! _-1�� � I : 1:1; ::::,:,; " �_ "', , � t ­__ __________ � ------ � --t - - - - � k ­ - - : ::: �:..:�:: -�l ]�::: I �, 't I , , I FORERA ', ,S', ,L/I I IM/,1 `/ I i �. 1 1-1-1 1 i ,� __ - �, _­_' i 1 p / I ; � �� I ___, . -- "I �7 �� ��i I 6 x 5'x 75" THic , . i I 1-1 I : :: : - : F : i ::: : :.�.:,.:.:.::: E-LEV, =J86.00. S/41/iLL ?� l -I- V4 --- L N ,, 0i'v! /70'reEB/I I � i /I � � � i - I � � eFlf-if -,,,,t,F� ("L _r? i I I I I I _3P7LL*1lY - 13C ,,,/,j3 C) r _,,, 1/ � L -,C I -) -_ 1 CL� I/ 1-1 T �!,, ­_,'! � r -/- � I - ,,, -- - cj­ 1 � _I � - 7_.. 3,,',,' - 1 / CON'GiRic � 1,5L i , 1 I .? 11 � i i I " I _;(TL/ F R/P -RAP LINED' IiV)ITI! O,EO)�F - I � I � __ - - 1 7/11111111T. W11.11�7�7 � i ia C/ __ - , L , , 1,11'�_,'�rj 1// , -1 vv/1-, RG", I � � - -1 Fit 7EF' IEXIBRIG' ,UNDERL L -_ - -A "r�Mt-EN 1 � � i � �,` vjf�i�"_ � I "7,�' � -_�?.I'..).L "'V- I] � �' I 2: 5 : V 0 I- I 11 �vl E C 375 1 1- (", X) = I, - , 8 , I _56'i00 LF . i I ,,_�P 2.0n��'111 � U) 1 W) I FFF, QU/\2_J_1yVOLb,1,,`IE . � � WIX fl�/�381,00i Z - �. ��FAZ ZAWI L_"'�� �___ 4f-"" h' I V. ot (F=_- 111�1341.). or",; r- -r > > UJI W 0 ,�f ,�,,J 0 C) r__ 0 N n -1 . N . 0 . 0 . 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I ":; : i:ii1% I ': :: .. .:: ;N��:,.� ... ::!;:: !.::�:::, - . : i ­:!!�, �!; . ; iil�ii::�:ii:ii:7, ,� . �i; : . ,�: 111 :: ::::::,�..... ; : Ml� , :.t; �: ::: ".., � ;: : :: : : I x; ..... I I M: :. ! ���, �iiIt �ii!: i�:� - , �1, ,, .. "', " .1 1­�� ....... - . . . :%:s�;�;;;;;;; I :::::::,:: c � ..'�,' :� ` ... : ; : : ::� �'1111::: I 9 "I �� � ��I! i�� � IN �j�r �i�� ` ,:.�-�;,:,���,;,:-�:,:-:;�:�:.:.:,:.:,;.:.:.:.;.:.:.:.;.;.:,;.;i�� : 4 �� .. ... i ......... ��;, : . . : ::: 0M , : : : I : ::: : ;* : : 01 ;:::.:: : : : : . ; : : :I , z : : : : : : : : :::.: : : ::: :: : : : I 1; . : : :�:::: : :� ::.::.:: : : :;:�: JA:Iiill � � 0 � I On ! � DIRTBAG I : PIIMPED CMIMFNT REMOVAL SYSTEM 0 Retains the silt, sand and fines while allowing the filtered water to drain out into the drainage system. Protect the environment effectively and economically with the ACF Dirtbag"t" The ACF DirtbagO collects sand, silt and fines, while regulating that enters streams, surrounding property and storm sewers. ACF can make custom Dirtbags"', to suit your needs. ACF Environmental manufactures the DirtbagO using a variety of woven and nonwoven geotextile fabrics. We can produce any size, dimension, or fabric weight requested, Each standard Dirtbagl� has a fill spout large enough to accommodate a 4" discharge hose. Straps are attached to secure the hose and prevent pumped water from escaping without being filtered. To increase the efficiency of filtration, place the bag on an aggregate or haybale bed to maximize water flow through the surface area of the bag.. Dirtbagr, is full when it no longer can efficiently filter sediment or pass water at a reasonable rate. Flow and removal rates will vary depending on the size of Dirtbag", the type and amount of sediment discharged into Dirtbag"', the type of surface, rock or other substance under the bag. Under most circumstances DirtbagO will accommodate flow rates of 5100 gallons per minute. Use of excessive flow rates or overfilling Dirtbage, with sediment will cause ruptures of the bags or failure of the hose attachment straps. Dirtbag"I must be monitored during use. The ACF Dirtbag'"'has been tested under ASTM D-7880 and ASTM D-7701, which are Standard Test Methods for Determining Flow Rate of Water and Suspended Solids Retention from a Closed Geosyn- thetic Bag, Testing summary available upon request. IIRTBAG11 SF ,r�:rl��;li��i�i:;;��;��::���:i]i:������i�iii����iiiii�i�i� ii::::�!�:�::j:ii:�iii�iiiiiii; i. Ii�i 0. - - _ 10,07100f Geotextile Properties - DB53 Geotextile Properties - DB55 Property Test Method Units Test Results Weight ASTM D-3776 oz/yd 8 Grab Tensile ASTM D-4632 lbs. 205 CBR Puncture ASTM D-6241 lbs. 525 Flow Rate ASTM D-4491 gal/min/ft' 90 Permittivity ASTM D-4491 sec.-' 1.4 UV Resistance ASTM D-4355 % 70 AOS IN ASTM D-4751 US Sieve 80 :11111 , k I �����:���������!���!���������!�!�����!���!�����i���i�:�i�!��ii���:�!l������������!!��!���!��!;� MONISM. , : ; : Geotextile Properties - DB55 I � Property " , Test Method Units Test Results I I : Weight ASTM D-3776 oz/yd 10 , :1 Grab Tensile ASTM D-4632 lbs, 250 ! 1 CBR Puncture ASTM D-6241 lbs, 625 tj I .. Flow Rate ASTM D-4491 gal/min/ft' 80 � ,j Permittivity 1 ASTM D-4491 sec.-' 1.2 1: 1 1 UV Resistant ASTM D-4355 % 70 , li ., AOS % .1 , ASTM D-4751 US Sieve 100 Dirtbar Test Results All properties are Minimum Average Roll Value (MARV) except the weight of the fabric, which is given for information purposes only. Depending on soil conditions and filtration requirements, acilditional geotextile options are available. All test methods are ASTM or industry standard, and have been verified by a third party testing facility. Test data is available upon request. - -1 -1- -__1 ­_ , I , -, ,,, f" \ ,\, , ,, , ., �, . 1� __ --- ­ -1-11 '­_ I, - 1,'� � " \ �/ " \ \ ­ , I,• -1- _-, - , , I - 1-11- - __ � - ,-, , 1� 11 �_� , In .. " ��. I \�', ... . - ­ .. ­_ I � 1, �, \ I (\ � ,I 11 � � I � - ,- ­_ � � . �,, \ � �', 11 , , - ,." - - ­_ .. I � 1, , � �, ,,�� \ I", I 1k ) , � \• , , 1/ 11 k I \ \ I \ \, \ Z /' AI'L.P. \ I f. " Wo \ I 11 / . � 11 , I I \ \ - � �, - � � _ I I- � ,A I � -1 I - ­_ ,\ \ 11 � ;,�111_ 11 11_<� ____ ��`_ , � , _� I . " 1\ � _� - . ., ,Z , - __ - -11 --- -, . I I , V�, ,,I,, 1� \ \ ' I \ 1 � ? 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