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HomeMy WebLinkAboutWPO202000034 Plan - VSMP 2023-02-06"rE REASSOCIATED PLANS WITH THIS PARCEL: fVEurRF LAIJn HOLDINGS LLCVSMP PO BOY 7505 AMENDMENT 1. FINAL SITE PLAN SDP-2020-00036 CHARL 07TESVILLE, VA 22906 2. ROAD & UTILITY PLAN SUB-2019-00170 Inc,L; 3. EASEMENT PLAT SUB-2020-00123 J,+'Ei NEW gFLVEDE,R 670 WEST RIO E, 4. RETAINING WALL DESIGN PLANS CHA.RLOT FFSVIf LE, VA 22901BELVEDERE PHASE 5 RE1,1,11 ROUD.ABUSH, GALE, & ASSOCIA7E5 974 MONTICELLO ROAD CHARL0TTES VULE, VA. 22902 (434)-977-O2195 WPO®2020®m00034 APPROVED '1 All 06200-00- 00-016D(J ��� F by the Albemarle County L - Community Development Department 15.00 ACRES Date 02/09/2023 ^� COUNTY '�. �qpII p��m. �Ay File WP0202000034 4 RESIDENTIAL. (T ITS PARCEL IS NOT Fill OT I F BFL VWERE ZMA-W04-(iC0?i I Ir ® II.ALDISTRICT, ` O � i' L ® �F'•'1Q VI, N IE '�V' )k Amendment #3 S?TEP .SLOPES - MANAGEDt STEEP SLOPES - PRESERVED VACANT DOSE[) LIst_` RESIDENTIAL DEVFLOPMENT l ` rFR/A- c T ; T RIO MAGISTFRIAL DISTRICT 5HE1 UPPER RIVANNA RIVER 'WARY' SO_ PLAT 'DIVISON OF OUNLORA" PREPARED BY WM, MORR/5 FOSTER; LAND SURVW'Ok, DAb D ^d)I✓EM `A1' r. 1985, REVISED DECEMBFR 20, 1965, RECORDED AT D8 875 PG 3W. "lGRAP,FiY' AERIAL. TOPOGRAPHY FLOWN IN 2076 BY BELL LAND SURVEYS LLC. TOPOCRAPHY STILL UAICIIANGCD B,LSL1.1 ON A SITE VISIT AND DESIGN PROFESSIONAL'S OPINION, THE SURVEY LS SPLL..A000,S'ATF 7C) THr Ff/ECI THAT THERE ARE NO EVIDENT VARIATIONS FIRE HYDRANT 455,10, RIGHT FRONT BONNET BOLT, AT CORNER OF FOWLER STREET AND FARROW DRIVE 7WM: HORZ: NAVD 88; VFRZ: NAD83 iy5'1- _AhV THIS PROJECT /S LOCATED WITHIN 'ZONE X" AS SHOWN ON FLOOD INSURANCE RATE MAP. COMMUNITY PANEL NUMBER 510003C 0279 D. £FFFCRVE DATE: FEBRUARY 4 2005. ViiENCE: BLJfiIA[ 5"E INAS FOUND ON SUBJECT PARCEL. FROGRV 6 F1 1:':`5) ARE PRESENT ON 1HE SUBJECT PARCEL. UvJ/GT W -' RTY 7S NOT" LOCATED WITHIN AN AGRICUL R)RAL-FORESTAL DISTRICT: r AW ['CATED WITHIN 7HE WATERSHED OF PUBLIC WATER SUPPLI'RESERVOIR. )EVFLOPMENI IE BELVEDERE PHASE 5, TMP 62-161), WILL OCCUR IN TWO SEPARATE STAGES OF CONSTRUCTION. THE COMPLETED SUBDIVISION WILL L AN EXFIFNU-D DETENTION FACILITY TO FACILITATE CHANNEL AND FLOOD PROTECTION. STORMWATER RUNOFF WILL BE COLLECTED AND CCNVF /ED A. STORMuVATER PIPE NETWORK TO THE FACILITY. NUTRIENT OFFSET CREDIT PURCHASE ROUNDS OFF THE STORMWATER APPROACH. ".'�,-,25-870-63. W,ATER QUALITY DESIGN CRITERIA REQUIREMENTS. ^,FW DEVELOPMENT, THE TOTAL PHOSPHORUS LOAD OF NEW DEVELOPMENT PROJECTS SHALL NOT EXCEED 0,41 POUNDS PPP ACRE PER YI_AR AU .CULA[ED PURSt,(PNT TO 9VAC25-870--65. 111A1TONS Slk`VN ON THIS PLAN WERE DETERMINED FROM ACCEPTABLE METHODOLOGY "DEO VRRM FROM NEW DEVELOPMENT COMPLIAN" ''LAD94EET VERSION 3.0." LU`>ION: `'.D ON NEV,,' DI `I_LOPMENT OF BELVEDERE PHASE 5 (A AND B), TMP 62-16D, SHOWN HEREON THESE PLANS, THE WATER QUALITY PORTIONS OF THIS v WILL BE SAT rFIED WITH PURCHASING 9.68 IB/YR OF OFFSITE NUTRIENT CREDITS IN THE: SAME OF ADJACENT HYDROLOGIC UNIT CODE (02080204)_ (�o,,,PLIANCE OF 9VAC25-870-651: OFFSITE ALTERNATIVE IAW 9VA.C25-870-69 PURCHASE OF NUTRIENT OFFSET CREDITS IS PROPOSED AND AFFIRMED. IN ,1CCORDANCE WITH CHANNEL PROTECTION SECTION B.3.A) OF 9VAC25-8/0-66 OF VIRCINIA LAW, THE MAXIMUM PEAK FLOW RATE FROM THE ONE-YEA,R 24- HOUR STORM FOLLOWING THE LAND- DISTURDING ACTIVITY APPEARS TO BE IN ACCORDANCE WITH THE ENERGYBALANCE METHODOLOGY: COEVELOPED S i.F.*(OPRE-DEVELOPED* RVPRE-DEVELOPED)/RVDEVELOPED P01, JT OF ANALYSIS 1: IiT QDEVELOPED LF.* (1YR QPRE-DEVELOPED * RVPRE- DEVELOPED) /RWEVELWED 0.O1'>4 0.80*(0.611 i 0.38) /1.27 0.144 (1.5" ORIFICE) S 0.144 7.5I2 (3" ORIFICE) POINT OF ANALYSIS 2: 1YR ODEVELOPED S I.F.+ (1YR QPRE-DEVELOPED • RVPRE-DEVELOPED)/RVDEVELOPED 0.772 S 0.80• (1.597 • 0.515)/ 0.680 3 0.772 S 0.97 cis IN REFERENCE TO FLOOD PROTECTION SECTION C.1), THE SITE'S POINT OF DISCHARGE RELEASES CAPTURED STORMWATER INTO A CONVEYANCE SYSTEM THAT, FOLLOWING LAND DISTURBING ACTIVITY, CONFINES THE POST-- DEVELOPMENT PEAK FLOW RATE FROM THE 10-YEAR 24--H(iUR STORM EVENT WITIiIN THE STORMWATER CONVEYANCE SYSTEM. QIOPOST -DEVELOPED S O1aPRE-DEVELOPED POINT OF ANALYSIS 1: 010POST--DEVELOPMENT (1.5" EB ORIFICE) = 4.207 cfs 5 010PRE-DEVELOPMEN1 = 4.373 cfs 010POST-DEVELOPMENT (S' EB ORIFICE) = 3.882 cfs S Q10PRE-DEVELOPMENT = 4,373 cfs VICINITY MAP SCALE: 1 "=1000 FEET LEGEND EXISTING INTERMEDIATE CONTOUR ------3322 EXISTING INDEX CONTOUR - — — -80T PROPOSED CONTOUR 20 EXISTING EDGE OF PAVEMENT ------ EX. EP------- PROPOSED EDGE OF PAVEMENT EP EXISTING CURB AND GUTTER ____ C&G PROPOSED CURB AND GUTTER CG-8 TRANSITION FROM CG-6 ROLL-TOP CGS ROLL-TOP EX. 15" RCP EXISTING STORM SEWER 15" RCP PROPOSED STORM SEWER EXISTING SANITARY SEWER —• —. —• —• —• —• — PROPOSED SANITARY SEWER PROPERTY LINE EASEMENT LINE CENTERLINE LIMITS OF CLEARING AND/OR GRADING ■■.............■ EXISTING SPOT ELEVATION PROPOSED SPOT ELEVATION +12-0 EXISTING TREE DRIP LINE EXISTING TREE PROPOSED TREE OAK EXISTING WATERLINE PROPOSED WATERLINE EXISTING FIRE HYDRANT PROPOSED FIRE HYDRANT EXISTING WATER VALVE PROPOSED WATER VALVE PROPOSED WATER METER EXISTING REDUCER PROPOSED REDUCER HANDICAP RAMP (CG-12) DENOTES LOCATION OF STD. VDOT CG-12 AND/OR JURISDICTIONAL STANDARD RAMP CONSTRUCTION PARKING INDICATOR INDICATES THE NUMBER OF TYPICAL PARKING SPACES BENCHMARK SOILS BOUNDARY VEHICLES PER DAY COUNT PROPOSED STREET NAME SIGN EXISTING SIGN PROPOSED SIGN SANITARY MANHOLE IDENTIFIER STORM DRAIN STRUCTURE IDENTIFIER U 1,234 VPD T T ©SHEET INDEX SHEET I COM SHEET CONDITIONS, SOILS & DEMOLITION PLAN EROSION CONTROL NARRATIVE SHEET 4 EROSION , EROSION • EROSION CONTROL TEMPORARY 1 ,4A ♦ .: ROAD EROSIONSHEET 7 - -------- EROSION CONTROL PLAN PHASE 2 - PHASE 5A & TEMPORARY FIRE ROAD SHEET 8 EROSION CONTROL PLAN PHASE 2 - PHASE 5B SHEET 9 - - - ----- EROSION CONTROL PLAN PHASE 2 - TEMPORARY FIRE ROAD SHEET 10 EROSION CONTROL PLAN PHASE 3 - PHASE 5A & TEMPORARY FIRE ROAD ASHEET 11 -- - ----- EROSION! lr-� AM PPAS37 3 r1HP,S751 A DETAILS CALCULATIONS WATER CALCULATIONS O COMPLIANCE ND CONVERSION HEM t E- . =C` C w 0 THE PURPOSE OF THIS AMENDMENT IS TO SHOW THE OFFSITE LIMITS OF CLEARING ON TMP 62-16A AND SHOW THAT THE PRIVATE STORSEWER PIPES FOR LOTS 245-254 ARE NO LONGER DRAINING TO THE RETENTION BASIN AS SHOWN ON SHEET 3 OF VSMP AMENDMENT #4 OF BELVEDERE PHASE 118 (WPO201600071). THE REAR OF THESE LOTS NOW DRAIN TO THE FIRE ROAD DRY POND AS SHOWN ON SHEET 18 OF THIS VSMP SUBMITTAL CHANGES TO THE OUTLET STRUCTURE ENSURE THAT THE REGULATED STORMS ARE BELOW THE APPROVED POST -DEVELOPED 1 - , EVELOPED FLOWS SEE (WP020 6 00071 AMENDMENT #4 FOR VRRM / WATER QUALITY ANALYSIS. An SHEET NUMBERING KEY: INDICATES ORIGINAL A13`INSHEET SO. AMENDMENT NO. NDICATES AMENDMENT U o U6 N O Z O(0 za �Yj H 82 J cl,) �4 �U =W m 0: ow O n �Q OR JZ a� ZO Ir rr� V 0> W � o x LL Z O 5; m N a, (WE V �a N Q N W Z j dO U � � J 0 aaw a/ o 0 U� �U in hC O U O U O U z W U i o54 o 1V O O tz p OCi 00 Cn � z o z W W z W z W z W U z z W 0 0 o o O O 0 ... VO W Ma z a z 2 2 0 U 0 U 0 U 0 U j g pz j a N O N O N O N O N O N O N O N Ln lz� m ti m g o 22 •-1 o N 0 M 0 -g O n 2 .-I N M st v+ w r DRAFTER: IDEG DESIGNER: I DEG PRODUCTION: oa L� ,p o; FF L Tag �O.►+ Lie. Na 2284, 2/6/2023 oti' BBroeeti � g z_ 0 0= w J LO 0 W W LLO (0 m z Q r Q a 2LL o w U wCr W QO_ z Cx 0CCNo x W z c9 ® 1-- aLU QF to Q ~ Fr W w 1-- U) _ CD Ir DAT : 07-1-2022 SCALE: 1" = 1000' FILE: WPO.2020-00oa4 RGA#: 6438 Al SHEET: •3 OF,B �I < 3 9"W --� - \ / / / i // 30 0 30 60 90 r \ i SCALE: 1"=30' \ B/M 1 TO BE INSTALLED ON CONSTRUCTED SLOPE i i i i i ALONG THIS FIRE ROAD ROUTE, GREATER THAN 10 VERTICAL FEET. MATTING TO BE INSTALLED WITHIN 1�y9 o 48 HOURS OF ACHIEVING FINAL GRADE. 6N�`15 0 � i / . I, \ � STEEP SLOPES (MANAGED) f10 / EX. PUBLIC DRAINAGE \ STEEP SLOPES (PRESERVED) o ` EASEMENT DB PG 5542/720 Y \ \ 1' MUD -TRAPS Q. CROSS SLOPE SILT FENCE MAY BE Lj \ REMOVED WHEN ROADWAY IS AT FINAL GRADE, BLANKET AND MATTING IS IN PLACE, AND COUNTY \ gsp x�x♦ INSPECTORS AUTHORIZE. _ - ' /^ �2p ♦ ♦♦ ALL SLOPES GREATER THAN 3: 1 MUST BE STABILIZED -- �� WITH LOW MAINTENANCE VEGETATIVE GROUND COVER // OTHER THAN GRASS, SUCH AS KENTUCKY BLUEGRASS 46b/ wool x—x - BOUNDARY LINE INFORMATION LINE BEARING DISTANCE L 1 N 81 °23'05" E 26.04' L2 S 29°78'35" E 27.36' L3 N 71 °09'25" E 27.84' \ i i ► ' 420 _ ��_� g5542 g.% x—x 40 E55 EASEM , \ \ 430 \ \ O \ \ �/ '✓ \ " �..u �x—x— — —x ,,- � X 'x NC% 0 if 5: ------------- _ ! •, x—x—x—x SF . -?= . .. ....... . _ , --' MU -- - 46 '- :.. :,.. A ♦ -''�� ♦♦�`v ----- -- �EMERGENG �� f \ ; ' ,. , .. ,,; � ��i �-'',- � !^` � 1 ,� / I ♦ ♦:"\wft40 PSBR\C EXENT 1 ♦♦ pCCE 0 ' TEMPORARY ♦ * — I / r ♦ � x— x— > SLOPE DRAINS 5N4/ �v 41+/+ ALL SLOPES GREATER �� I 1 li THAN 3:1 MUST BE rS �I+ , `� ` \ /�i ��% ; �, STABILIZED WITH LOW ' MAINTENANCE VEGETATIVE , 4*V OTHER �pc•. �� ; ; ��� ��:� jit� ��� ��� N THAN GRASS SUCH AS KENTUCKY r. - 441 _ i G \\ �S�J I=' / ' ��I�46 , l EX. SWM EASEMENT�� � ` TSD S s ���R ,, o j ->�6 \ DB-PG 5542/720 ♦ �4 I, �, I - �, DIRECT RUNOFF FROM THE REAR OF LOTS HORSESHOE RING OF ,�� - Is *110 245 THROUGH 254 TO THE EXISTING TEMPORARY SLOPE TSD ,�. ,� --� + AGGREGATE SLOPE DRAIN AT THE SOUTHEAST CORNER OF THE (SEE SHEET 18) --1 = Z SEDIMENT TRAP. TEMPORARY SLOPE DRAINS ARE TO BE CONVERTED TO 4' WIDE 2:1 SIDE SLOPE DITCHES LINED MATH CLASS 1 RIP RAP. 01 RD III a \\ r�_y\i •i' '' , \ � "-- - _ /' \ � ��Q�,I Ili' 39 l `�• l r d 460 ' Q 0 v v, 1 ✓r , ', I P 5 v1 ' � v c1000v Right Front Bonnet r \ , ' ' \� ♦ s� \ o \ ` �� �o \`\ BM ELEV. 455.10RN0�,2 r \1F ��FP Z o �o s` Bott on Hydrant �r b��\ G' P� flIP RPP CLASS � r„ CLA55 AI 20• CLASS I 26" CLASS II IB• aAss n< sa• Ar I I I \ /\ SF' ^�- ,Opp \\2\� \ \� \P \ "-2,\O Z �- "` l\\` %;/' / \ \ . r? 5 �P6��\�\ �V x\s� �2/ � O� ` I \ 1!►` QO\ Ik- \ \ \ \ \ \ '� Z 1 \ \\\�\ \ / •\ cc \ %i� O \ \ �\ 00` \ �cb`� ��\� �`O.\Z� j �,' .'.. �j�,..i. ;,. ,� �.\ c\�. •\. .\ III / GX +\ \ \ \ \\ \\ O lU \ i , S O� p c�\za;, / ,. // y' ,(\�0 2 O ff\ \ '. .: .... :': \ , Q \ y �\�\ Rio Z 0\ ` ' .i �' >\ .; ,.'' 1 --- -----------T- \ `\ \ \ \\ \ \g 5\�� g� Gj l\ \ Q \� I` y\\ o o\ l / /VIL . A v �� _ �.. .. ,` \\ \\ `,, �\ � .p \\ \ \\ \ , ,, // Off. % ✓ \ \\ \\ \\ r \ \\ \\ � \ \ \ \ 1 \ P \\ �6 \ ♦ \ EXTENT OF / CPC -------- ` \ �> o ♦ \ WPO2016-00071�0 y�\P \ N MAIN ILL... +\ ` wPPESMT DB55) PG720�0 �9,0 0-/ A111, \ v VIL VIL \ \• St \ I / / \ \\' \ \ \ t \\ \\ \ \ \ \ \ n OVj- \ \ I \ \ \ \ \ �0. \ \ ' ` ,.. .�_ — � \ \ \ \ ; \ .\\ \\ �\ / -- / \ \ IN N V Vvv0 \ �v � v \ B v A v ' . i / ..'\ 6 /i r \ \\\\OoI09 i 9 rn zU g w U o U -° Z z U) Oo(D �Y; 2 J vi Q0 2< J U r J = OU ¢U) m W Ow I;o ::) w OQ M Er na JZ vU z� ¢_ �>fn $ x Wc) > N V Ir 0 aw w w Q z > o U U) J a J _0 U)O a z w w/ UU o Fri w �Q rn = rn U A A 4t z z z z Z W W W W O 0 0 0 o d O z z U D U U U w O O O U U U > N N O ry N a � ti ti O_ z o0 In z z z z z z z z z z Z W W W W W W O z r 0 0 0 0 z o 0 u o 0 0 o z � z w r rF- F- a a o z z z z a z O O O O 2 g 2 U U U U j p Z CD w a O O O O ti� N N N N N N N N Q� M M O ul M O z Op Jimmy LTaggart LiC. No° a�of 2/ 2023 sg8IONA'. Spa a Z_ > w I CC Q crD O0wLJw w �cn Q�Q� a_ = w o a rx H a C) } r4 w w o a �. � N O o� z w (0 E- 04 U w Q F Q Zo EW- U) w Q co >m w Q DESIGNED BY: DEG DRAWN BY: DEG 'CHECKED BY: JILT DATE: 06-11-2020 SCALE: 1 "=30' FILE: wPo-2020-00034 RGA#: 8438 SHED: A.12.3 oF,$ TEMPORARRY SEDIMENT TRAP 3 TOTAL REQUIRED BASIN STORAGE =134CY X 2.96 AC = 397 CY TOTAL AVAILABLE BASIN STORAGE= 4,040 CY WET STORAGE REQUIRED HALF OF TOTAL STORAGE MINIMUM 67 CY X 2.96 AC = 198 CY SET WET STORAGE AT ELEVATION 432.5 WHICH CORRESPONDS TO THE TOP OF THE RISER. 461 CY OF STORAGE IS AVAILABLE AT ELEVATION 432.5. SET CLEANOUT ELEVATION 0 429 = 211 CY OF STORAGE AVAILABLE DRY STORAGE MINIMUM 67 CY X 2.9.6 AC = 198 CY TOTAL DRY STORAGE AVAILABLE BETWEEN 432.5 - 440 = 2592 CY EMBANKMENT TOP = 440 (ELEVATION OF FIRE ROAD) EMBANKMENT WIDTH = 30 FEET (WIDTH OF FIRE ROAD) AS -BUILT STAGE STORAGE TABLE ELEV AREA (sq. ft.) DEPTH (ft) AVG END INC. VOL. (cu. ft.) AVG END TOTAL VOL. (cu. ft.) 426.50 120 N/A N/A 0.00 428.00 2,607 2.00 3,159 3,841 430.00 3,711 2.00 8,795 12,636 432.00 5,084 2.00 11,643 24,279 434.00 6,559 2.00 14,834 39,113 436.00 8,275 2.00 18,571 57,684 438.00 12,656 2.00 22,952 80,636 440.00 15,799 2.00 28,455 1 109,091 WATERSHED SUMMARY TO POA #2 PRE DEVELOPMENT POST DEVELOPMENT SITE AREA = 2.68 ACRES ITE R = 2.9 AC ES CURVE NUMBER (CN) = 65 C = 69 TIME OF CONCENTRATION = 9.9 MIN TIME OF CONCENTRATION = 9.9 MIN 9VAC25-870-66.B.3: CHANNEL PROTECTION ENERGY BALANCE CALCULATIONS - 1 YEAR PRE -DEVELOPMENT CONDITIONS POST -DEVELOPMENT CONDITIONS POST -DEVELOPMENT CONDITIONS ROUTED 1-YR Q(PEAK) = 1.597 CFS 1-YR Q(PEAK) = 2.62 CFS 1-YR Q(PEAK) = 0.75 CFS TIME TO PEAK = 12.03 HRS TIME TO PEAK = 12.03 HRS TIME TO PEAK = 12.27 HRS VOLUME = 5,169 CU.FT VOLUME = 7,540 CU.FT VOLUME = 1,879 CU.FT 9VAC25-870-66C: FLOOD PROTECTION - 10 YEAR PRE -DEVELOPMENT CONDITIONS POST -DEVELOPMENT CONDITIONS POST -DEVELOPMENT CONDITIONS ROUTED 10-YR Q(PEAK) = 7.63 CFS 10-YR Q(PEAK) = 9.92 CCFFS 10-YR Q(PEAK) = 1.53 CFS TIME TO PEAK = 12.03 HRS TIME TO PEAK = 12.03 HRS TIME TO PEAK = 12.40 HRS VOLUME = 20,152 CU.FT OLUME = 25,966 CU.FT VOLUME = 25,957 CU.FT 3 ENERGY BALANCE EQUATION: QDEVELOPED S I.F.*(QPRE-DEVELOPED* RVPRE-DEVELOPED)/RVDEVELOPED DEVELOPED 5 I.F.* (1YR QPRE-DEVELOPED * RV PRE-DEVELOPED)/RV DEVELOPED j.7J5 Q s 0.80* (1.597 0.515) / 0.680 3 <- 0.97 cfs FLOOD PROTECTION: Q1OPOST-DEVELOPED S Q10PRE-DEVELOPED 1.53 cfs � S 7.63 cfs 3 CURRENT CONDITIONS GOAL IS TO COVER TOP t } OF ORIFICE HP STORM TRENCH INSTALLATION DETAIL MIN. COVER TO MIN. COVER TO RIGID PAVEMENT. H FLEXIBLE PAVEMENT. H FMIAL it BACKFLL SPRINGLINE 1- BgITINI BACKFLL HAUNCH BEDDING 4' FOR 12"-24' PIPE I 6' FOR 30'-W' PIPE I MIN TRENCH WIDTH ,•I SUITABLE Fes' (SEE TABLE) FOUNDATION NOTES: 1. ALL PIPE SYSTEMS SHALL BE INSTALLED IN ACCORDANCE WITH ASTM D2321, STANDARD PRACTICE FOR UNDERGROUND INSTALLATION OF THERMOPLASTIC PIPE FOR SEWERS AND OTHER GRAVITY FLOW APPLCATIONS", LATEST ADDITION. WITH THE EXCEPTION THAT THE INITIAL BACKFILL MAY EXTEND TO THE CROWN OF THE PIPE SOIL CLASSIFICATIONS ARE PER THE LATEST VERSION OF ASTM 02321. CLASS IVB MATERIALS 1 Ml CHT AS DEFINED IN PREVIOUS VERSIONS OF ASTM D2321 ARE NOT APPROPRWTE BACKFlLL MATERIALS. 2. MEASURES SHOULD BE TAKEN TO PREVENT MIGRATION OF NATIVE FINES INTO BACKFLL MATERIAL, WHEN REQUIRED. 3. FOUNDATION: WHERE THE TRENCH BOTTOM IS UNSTABLE, THE CONTRACTOR SMALL EXCAVATE TO DEPTH REQUIRED BY THE ENGINEER AND REPLACE WITH SUITABLE MATERIAL AS SPECIFIED BY THE ENGINEER. AS AN ALTERNATIVE AND AT THE DISCRETION OF THE DESIGN ENGINEER. THE TRENCH BOTTOM MAY BE STABILIZED USING A GEOTEXTILE MATERIAL. 4. BEDDING: SUITABLE MATERIAL SHALL BE CLASS I. B, 11, OR N. THE CONTRACTOR SHALL PROVIDE DOCUMENTATION FOR MATERIAL SPECIFICATION TO ENGINEER. COMPACTION SHALL BE SPECIFIED BY THE ENGINEER IN ACCORDANCE WITH TABLE 3 FOR THE APPLICABLE FILL HEIGHTS LISTED. UNLESS OTHERWISE NOTED BY THE ENGINEER MINIMUM BEDDING THICKNESS SHALL BE 4" 100mm FOR IT-24' 300mm600mm DIAMETER PIPE• 6' IT FOR 30.60' 750mm•1500mm 1 ( 1 DIAMETER PIPE. THE MIDDLE 193 BENEATH THE PIPE INVERT SHALL BE LOOSELY PLACED. PLEASE NOTE, CLASS N MATERIAL HAS LIMITED APPLICATION AND CAN BE DIFFICULT TO PLACE AND COMPACT: USE ONLY WITH THE APPROVAL OF A SOIL EXPERT. NSACKFUL: T HA N THE P EXTENDING T T GROWN F TH 5. INITIAL C SUITABLE SHALL PROVIDE S LL BE CLASS I, N x, OR INN E PIPE ZONE ON T DI G O HE C OW O E PIPE. THE CONTRACTOR SHALL PROVIDE DOCUMENTATION FOR MATERIAL SPECIFICATION TO ENGINEER, MATERIAL SHALL BE INSTALLED AS REQUIRED IN ASTM D2321, LATEST EDITION. COMPACTION SHALL BE SPECIFIED BY THE ENGINEER IN ACCORDANCE TABLE 3 FOR THE APPLICABLE FILL HEIGHTS LISTED. PLEASE NOTE CLASS V MATERIAL HAS LIMITED WITH LI Fl I I 1 VE LI I APPLICATION AND CAN BE DIFFICULT TO PLACE AND COMPACT USE ONLY WITH THE APPROVAL OF A SOIL EXPERT. 6. MINIMUM COVER MINIMUM COVER, H. IN NON -TRAFFIC APPLICATIONS (GRASS OR LANDSCAPE AREAS) IS 12" (300mm) FROM 12" PIPE OIAM. MIN. TRENCH WIDTH 1T 3T 300mm 762mm 15• 34' 375mm 884mm IS" 39' 450mm 991mm 24' 48' 600mm (12 11 30• 56- 750mm 1422mm 36' fi4' 900mm 1626mm 4T 7r 10im 1829mm BO 12m 2032mm 96' 15m 2438mm) TABLE 2, MINIMUM RECOMMENDED COVER VEHICLE LOADING CONDITIONS SURFACE LIVE LOADING CONDITION HEAVY CONSTRUCTION PIPE qAM. M-25 (75T AXLE LOAD)' 12'-48" 1T 48- 300mm-1200mm 305mm 1219mm 60' 24• BIT 1500mmI (1524mm) ' VEHICLES IN EXCESS OF 75T MAY REQUIRE ADDITIONAL COVER TABLE 3, MAXIMUM COVER FOR ADS HP STORM PIPE, 8 CLASS I CLASS II CLASS III CLASS N PIPE DIA COMPACTED 95% 90% 85% 95% so% 95% iT 41 28 21 16 20 16 16 (300mm) (12.5m) (8.5m) (Ill (4.9m) (6.1m) (4.9m) (4.9m) IT 42 29 21 16 21 16 16 (375mm) (12.8m) (81 (BARI) (4.91n) (6Am) (4.9m) (4.9m) 18, 44 30 21 16 22 17 16 (450mm) 03A,n) (90,R) (6.4m) (4.9m) (6.7m) (5.2m) (4.9m 2A' 37 26 18 14 19 14 14 (60ORN") (11.3m) (79m) (5.5m) 4.3m) (5.8m) (4.3m) (4.3m 30' 39 27 19 14 19 15 14 (750mm) (11.9m) 1 (B.2m) (5.8m) (4.3m) (SAM) (4.6m) (4.31n) 36' 28 20 14 10 14 11 10 (9oomm) (8.5m) (8.1m) (4.3m) (3.0m) (4.3m) (3.4m) (3.0m) 42' 30 21 14 10 15 11 10 (1050mm) 19.im1 IBAm) (0.3m) (3.Om) 14Bm1 (3.an) (3.0m) 48' 29 20 14 9 1q 10 10 (1200mm) (8.8m) (6"Im) (4,3m) (2.7m) N.3m) (3.0m) (3.0m) 60' 29 20 14 9 14 10 9 (i50anm) (B.BM) 16.1m) (0.3m1 (Z7m1 11.3m) (3.Om) (2.7m) THE TOP OF PIPE TO GROUND SURFACE. ADDITIONAL COVER MAY BE REQUIRED TO PREVENT FLOTATION. FOR TRAFFIC FILL HEIGHT TABLE GENERATED USING AASHTO SECTION 12, LOAD APPLICATIONS: CLASS I OR II MATERIAL COMPACTED TO so%SPD AND CLASS III COMPACTED TO 95% SPD IS REQUIRED. RESISTANCE FACTOR DESIGN (LRFD) PROCEDURE WITH THE FOLLOWING FOR TRAFFIC APPLICATIONS. MINIMUM COVER, M. IS 12' (300mm) UP TO 48' (1200mm) DIAMETER PIPE AND 24' (600mm) OF ASSUMPTIONS: COVER FOR SIT (1500mm) DIAMETER PIPE, MEASURED FROM TOP OF PIPE TO BOTTOM OF FLEXIBLE PAVEMENT NO HYDROSTATIC PRESSURE OR TO TOP OF RIGID PAVEMENT. UNIT WEIGHT OF SOIL (Ys) a 120 PGF 7. FOR ADDITIONAL INFORMATION SEE TECHNICAL NOTE 2.04. E REV•MANMGMCGVl HEIGHTS Ru4D 01HU17 x xx�x MB.,F, REV. DESCPoPTON BY I M"Bm CHWD UIVANCED DRANADE SYSTEMS. INC ('ADS') HAS PREPARED THIS DUAL BASED ON INFORMATION PROVIOED TO ILA THIS DRANMG IS '• JAB RTENDED TO DEPICT THE COMPONENTS AS REQUESTED. ADS HAS NOT PERFORMED ANY ENGINEERING OR DESIGN SERVICES FOR MS - 'ROJECT. NOR HAS ADS INDEPENDENTLY VERIFIED THE INFORMATION SIIPPUEU. THE INSTALLATION DETAILS PROVIOEDHERENARE GENERAL TRENCH INSTALLATION 16W rilUEMAN BLVp p1R9 - IECOMMENDATIONS AND ARE NOT SPECFIO FOR THIS PROJECT. THE DESIGN ENGINEER SHALL REVIEW THESE DUALS PPo011 TO RETAIL. (� STORM) HE.LIARD, OHIONIOM ;ON6TRUCTION R IS THE DESIGN ENGINEERS RESPONSBIOtYTO ENSURE THE DETAILS FRONDED HEREIN MEETS OR EXCEEDS THE IPPUG4BLE NATIONAL STATE, OR LOCAL REOIAREMENTS AND TO ENSUREnUTTHE DET,VLS PROVIOED HEREIN ARE ACCEPFABLE FOR THS wm m.wrx x.nen.u-. " NTS mOJECL OMWINO NUMBER: STD•1016 i Or i 0 II 11� kt O I I I I II I 1 � I I Jill I 1 1 I I I I I I I I # 1 1 1 1 1 , 1 1 I h1IpIII II' \ Gb4 I I I I I , II Nv - PRE -DRAINAGE AREA TO POA9i12: 2.68 ac CN = 65Y/ ago To: 100' sheet flow w/ A ELEV = V & 459 OF CONC. FLOW W/ A ELEV. = 60' �' � �• I / ,`� i � \ "' �4 To: 9.9 min PRE - Q 1 year = 1.60 1 PRE - Q 10 year = 7.63 Dills \ ! II !/ FIRE ROAD PLAN VIEW NARRATIVE: THE EXISTING SEDIMENT TRAP (WPO-2016-00071) WILL BE MODIFIED AS SHOWN HEREON THESE PLANS TO CAPTURE A DRAINAGE AREA OF APPROXIMATELY 2.96 ACRES. AN EXISTING 48" RISER AND ANTI -VORTEX DEVICE HAS BEEN BUILT AS SHOWN. A PRINCIPAL SPILLWAY WEIR PLATE IS NECESSARY IN ORDER TO REDUCE THE ENERGY BALANCE AND 10YR STORMWATER POST -DEVELOPED PEAK FLOWS TO BENEATH THE APPROVED PLAN LEVELS. THE WEIR PLATE, OVER THE BOTTOM HALF OF THE 12" LOW FLOW ORIFICE, IS SHOWN BELOW. DURING THE EROSION CONTROL PHASES, CONTRACTOR TO INSTALL A HORSESHOE RING OF AGGREGATE AROUND THE RISER THAT WILL SERVE AS A FILTER FOR WATER TO PASS THROUGH SIMILAR TO THAT FOUND WITH THE TRADITIONAL SEDIMENT TRAP DESIGN. THE STORMWATER QUANTITY REQUIREMENTS AT POINT OF ANALYSIS #2 (POA #2) MEET THE MINIMUM CHANNEL AND FLOOD PROTECTION REQUIREMENTS SET FORTH IN 9VAC25-870-66. (9) j" X 2j" (OR LONGER) TAPCON (OR EQUAL) EPDXY SEALED ORIFICE, SIZE TRASH RACK AS NEEDED FOR FULL COVERAGE RECOMMENDED FABRICATION: J"HOLE 1" FROM TOP TO BE USED FOR CLEVIS ATTACHMENT & LIFT, THEN BOLD TT ATTACHMENT (typ. OF 3) STAINLESS PLATE 18" HORSESHOE RING OF AGGREGATE (EROSION CONTROL PHASE) 2.5' COARSE AGGREGATE ELEV = 429.00 3' HIGH ELEV = 426.00 CLASS I RIPRAP HOLE 1" FROM SIDE WALL FOR BOLTS (TYP. OF 6) NOTE: PLATE TO BE ARCHED TO FIT EXTERIOR RADIUS OF A STO. 4 FT. MANHOLE 24" , SIZE TRASH RACK AS NEEDED Isometr is sx�tio" 3" x.,.u..... i... s ,r•., Zil z 4 ..v,(._nr" Elevation PLASTIC BMP TRASH RACK soLCTIaBs INC. �......_,. 455 450 445 440 435 430 425 420 415 410 405 400 395 94 �I.� 6i 20' PUBLIC DRAINkE,dc____--- MAINTENANCE /E9sIEMENT,' EXTENT OF WP02016-00071 FIRE ROAD PIPE PROFILE HORIZ. SCALE: 1"=30' VERTICAL SCALE: 1"-10' n ■ OA !I 31Lw "lo 79 1 DAM04 00 II I I I^ I I I I I j PROPOSED FIRE ACCESS ROAD WITH REVERSE SLOPE BENCH ---- ' I ' I / ' ,15PN I--- I, 16 ----- EXISTING GRADE I� - I I� 75 10+00 11+00 eSPECIFICATIONS OUTLET PROTECTION VDOT EW-1 HEADWALL 15" HP PIPE 1 Q1 = 0.75 cfs 3 Q2 = 1.00 cfs Q 10=1.53cfs ------ CPMENT -- REA M BE CULVERP CCNN 40 455 450 445 440 5 AS -BUILT 48" RISER CREST ELEVATION AT 432.50' 0 425 420 BASIN BOTTOM STABILIZED FINISHED GRADE = 426.50. 41 RISER TO HAVE STEEL PLATE COVER THE BOTTOM HALF OF THE 12" LOW FLOW ORIFICE AT 41 ELEVATION 426.5 WHICH SATISFIES THE ENERGY BALAN( REQUIREMENTS. TRASH RACK T 40 BE INSTALLED OVER ORIFICE 395 12 00 OUTLET PROTECTION IS SIZE IN ACCORDANCE WITH PLATE 3.18-3 OF THE VIRGINIA EROSION CONTROL MANUAL. 3Do = 15" * 3 = 3.75' La 8.5' MIN W = Do + La = 1.25 + 8.5 = 9.75' *DESIGN ENGINEER RECOMMENDS FULL CHANNEL WIDTH MIN 8.5' CL I RIPRAP STANDARD ECA CLASS 1 REQUIRED TYPE A INSTALLATION OUTLET PROTECTION T 0n I )r L0 EC-1 CLASS 4nJ RIPRAP Q^z z 24" MIN. DEPTH z¢ W/UNDERLYING F.F 3= J U = Li �1 MIN DEPTH OF RIPRAP = 24" a W zU g FBI m w U Z zaN 0 (O �Ya J Go Q� <w C) �I J = T �L OO aU m "0 dZ C)w a O(D w0 0 W OQ �< JZ vIE z0 C7 ° -ICE > o h.j w o F+� w O 2i GO Ir> o a w ° v w N w Q� z J > O U w a J > v» _ 0 CO O a C) 0 Fil w to Q rnIE rn U z z z z z z z Z w w w Z O 2 E 0 0 0 o = 0 0 o z u L� v v w w Q o z z z a 0 0 0 O O O ; N N O N Do N w O O N O Do N N O00oMC) 04 zZ 2 z z z z I- o I- z W W W W z U z O 2 2 2 2 w z w � 2 2 2 2 0 z o a o CC 0 0 0 o w w o z z z z� Z 0 0 0 0 2 o w a ry N N N N N N W O O O O O O O r ry N N N N N N e-1 N m eH O O Z.--I N M V Ln l0 n o���SyT/B op pjQM Jimmy LTaggart Lie. No. 22841 ba A_Oo 2/6/2023 geroxe7. se Q Z_ D: > w a 0 LU 0 W ZIT_°_° O_ = LLI O cz7 z� c� w LLI w Q Z Wo 10 Lup w SQ Q L Cn X cj > m ~ w (n 0 a 0 D: DRAFTER: DEG DESIGNER: DEG PRODUCTION: JLT DATE: 07-1-2020 SCALE: NA FILE: wPo-2020-00034 RGA#: 8438 SHEET:+ +i