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HomeMy WebLinkAboutWPO201300032 Plan - VSMP 2021-02-19I, VSMP AMENDMENT #2 FOR WP0201300032 CASCADIA -BLOCKS 4 - 7 TM 62, PARCEL 25 TM 78, PARCELS 59 & 59A TM 78E, PARCEL H1 RIVANNA DISTRICT, ALBEMARLE COUNTY, VIRGINIA - Pro Hegma 9F C Y S P $ I -ae ` u:euM o, Plenklm =�rdea S,VP� 4 9 Is e n'{ ' "`o `s ovwR 9 � Tw:e P.* P T ay 6r EN 4. Co q H p'e mft n Cou by `-4 H.. g4 n �p9 F.W. F 'CMvne WM e aP� a '4"ebM Rd ® ® Roo. MRd � P 4 o- 'e"w,yQ w� HRuwm o, r a ncnden R, ® } Papw'o,. P:olees. Ca nd Gh m CandCmtlo iverbem�'4 Hm cone. � o aeew Rd. MeP aeu aediz moth.- erd io moRioR COUNTY ENGINEER Curve Radius Tangent Length Delta Chord Chord Bear. C1 19.2.9 618 56 19..2.6 S 26'01 23 W C2 822 48 S'205255 E C3 540.00456. 12'00 07 1291 7'03751 W 35.00 29.6345C4 80'310 23 N'630702 E 225.01 12.41 847 61 2C5 78 N -260124 E4 .. 2 34.16 3'34 2006 E Course Bearing Distance L1 S 76'09 34 E 11.4 L2 N 821849 E 18.27 L3 N 55'4711 E 24.40 L4 N 54'3417 E 51.77 L5 N 635310 E 24.62 L6 N 78'35 38 E 53.53 L7 S 88'54 21 E 14.91 L8 S 54'53 41 E 54.57 L9 S 43'0813 E 141.55 L10 S 53'42 27 E 102.87 1. 1 S 1 T4615 E 166.27 L12 S 103018 W 81.51 L13 S 26.34 07 E 85.75 L14 S 1111 50 E 193.39 L15 S 42'S815 E 44.97 L16 S 0327 49 W 97.27 717 S 3513 55 E 69.16 L18 S 20'38 22 E 65.59 L19 S 02'4516 W 89.84 L20 S 39'49 04 E 53.80 L21 S 39.49 04 E 13.70 L22 S 25-01 39 W 266.18 L23 N 64'58 21 W 192.44 724 N 64'58 21 W 347.14 L25 S 4920 31 W 113.71 L26 S 22'51 58 W 53.92 L27 N 2251 58 E 61.25 L28 N 133243 E 64.09 L29 N 6458 21 W 322.64 L.30 N 401158 E 53.79 L31 N 3824 58 E 181.21 L32 N 07.0910 E 108.09 L33 N 1419'04 E 88.36 IMP 78E-H FONTANA LAND TRUST 20' RWSA ESMT. DB 859 PG 53 DB 742 PG 195, 197 PLAT IMP 78-57A KMH PROPERTIES LLC. DB 3222 PG 519 MON. FOUND NEW PERMANENT - DRAIN. EASEMENT DB 2436 PG 623 IMP 62-25C IMP 62-25C1 BROADUS MEMORIAL BAPTIST CHURCH DB 1109 PC 353 DB 1078 PC 97 10' PRIVATE EASEMENT TO BROADUS CHURCH PROPERTY DB 3662 PG 444 20' SANITARY SEWER EASEMENT DB 3662 PG 444 NAIL SET IN WOOD BRIDGE IMP 62-25 CASCADIA DEVELOPMENT, LLC "PARCEL TWO" IMP 78-59 IMP 78-59A IMP 62-25 DB 4209 PG 088 55.266 ACRES (TOTAL) IMP 78-59 FARM RD. IMP 78-59A 20' SANITARY SEWER EASEMENT DB 3662 PG 444 NF @ 18" N IMP 62-26 CASON, WILLIAM DB 793 PC 106 IMP 78-57 PANTOPS-LAKERIDCE LLC. DB 2805 PC 70 CASCADIA DEVELOPMENT, LLC y-59-W "PARCEL ONE" ?10S IMP 78E-HI 0' (TDTAC) v DB 4209 PC 088 �¢ N 5.506 ACRES �� IMP 78E-H N r� 2 FONTANA LAND 12 9 v1 TRUST w �23 42 V2919 r�i' Y� �A'I Az6 o N JPf �Z6 in 78E-C A�3 TMP 78E-H FONTANA OWNERS ASSOCIATION, �ONTAAA A�2 FONTANA LAND TRUST DB PC 281 Opp SUg�fpISI SA9C� �Z1 100' VIRGINIA ELECTIRC & ON POWERCOMPANY EASEMENT Aj7gs� 1Z0 DOPG 284 2g SEE ALSO DB 867 PG 337 SW 1 Cover Sheet 2 viations, & Legend SW3 Existing Conditions SW4 Subdivision Overview �:LTH 0p Dustin E. Greene Lic. No. 55833 44 A�On 02/19/21 Bg&ZONAL $�6 SW5 Erosion and Sediment Control Phase 3 Plan Overview SW6 Erosion and Sediment Control Phase 3 Plan SW7 Erosion and Sediment Control Phase 3 Plan SW8 Erosion and Sediment Control Phase 3 Plan SW9 Erosion and Sediment Control Phase 3 Plan SW 10 Sediment Basin Details SW 1 1 Sediment Basin Details SW 12 Sediment Trap Details SW 13 E&SC Details SW 13A Stormwater Management Plan - Final Grading al Grading CSW 4 Stormwater Management Plan/Details 2 1 al s SW 16 Stream Buffer Mitigation Plan SW 17 Pre -Development Drainage Areas SW 18 Post -Development Drainage Areas SW 19 Storm Sewer Profiles SW20 Storm Sewer Profiles SW21 Storm Sewer Profiles SW22 Storm Sewer Profiles SW23 Storm Sewer Profiles and Details SW24 Storm Sewer Calculations SW25 Storm Sewer Calculations VSMP AMENDMENT #2 FOR WP0201300032 THIS AMENDMENT IS TO CONVERT THE SEDIMENT BASIN FACILITY IMMEDIATELY ADJACENT TO ROUTE 20 NORTH INTO THE PERMANENT WET POND FACILITY THAT WILL PROVIDE STORMWATER MANAGEMENT WATER QUANTITY AND QUALITY CONTROL FOR THE 60.77 ACRE CASCADIA SUBDIVISION. THE NORTHEASTERN PORTION OF THE POND BOTTOM AND THE EASTERN 2:1 POND UPLAND SLOPE WAS LOCATED IN CUT WITH DEPTHS OF UP TO 30. SIGNIFICANT ROCK WAS ENCOUNTERED IN THESE LOCATIONS AT THE POND ELEVATIONS, WHICH WAS FAIRLY HARD ROCK, BUT WAS ALSO FAIRLY RIPPABLE. THE CONTRACTOR RIPPED AS MUCH OF THE ROCK AS FEASIBLE USING A HOE RAM BUT ENCOUNTERED REFUSAL AT BEDROCK. FOR THIS REASON, THE PROVIDED POND VOLUME IS APPROXIMATELY 90% OF THE ORIGINALLY APPROVE PLANS. THE PERMANENT POOL HAS BEEN LOWERED AND THE OUTLET STRUCTURES HAVE BEEN UPDATED SO THAT THE STORMWATER FACILITY PERFORMS WITH THE INTENT OF THE ORIGINAL APPROVED PLANS AND CALCULATIONS. PLEASE SEE SHEET 14 FOR THE UPDATED DESIGN DETAILS AND THE H&H CALCULATIONS FOR COMPLIANCE WITH THE ORIGINAL APPROVED PLAN. a �o 2 CV W CQ Z ZaO° O� >O 0 'K WZ r ^ /1 O �W JJ ¢, CC W Q W w Oy Q Q 00 Qi W y 2 oc O� M O N Q'A y, WO O' o, OQ o rr� J- y a<¢ 4 W W Ln y, Qy Ho Z �uj w Z oW�a REVISIONS VSMP AMENDMENT MAY 24, 2018 EROSION STABILIZATION AREA ADDED AUG. 22, 2018 COUNTY COMMENTS SEPT. 17, 2018 COUNTY COMMENTS OCT. 2, 2018 VSMP AMENDMENT FEB 19, 2021 DATE APR. 17, 2014 SCALE AS SHOWN O ~ z_ z tr J Y z 0- z O0 W I1J m w Q W U m Ir 0 Q a W w p o U QFr Q C) Q z > U� FILE NUMBER 12.0065 A SHEET SWi First interconnection to gro0du a tist Church In occordangce with proffer #3 1 1 DB 4712 PG 1 4 Class A 1 g DB 4732 P 10' Trail 30' Access \ \ Easement SWM Maintenance Easem tit \ 56% 4 \ �oi & DB 4732 PG 678 1 MATCH EXISTING RIP RAP end S��YMi l l / / / , . \ 10Priv< erhept / / / / / To Broat \\ \I & B\43G1104 / / / / / / // /,\ DB 36E p Cn 1 I I I I I I I I I I I / \ o x �� ll/ll l+ of 1� ll/// yD0 IIII ' IIII 11 /ll ll //l'llii I '' B � IIII III I I l I I I II I /l !l 60" RCP Riser I I j 11 l I l q! 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IIIII II II IIII II II II I Ii 11I lIIlII II 11 I1 I1b11 1 IIIII Ars \ I II'Ili11I11III!I�11'II'�1'1111 �11 111 IIII 11 11 11 1 I l i (IIII Plant A autic Bench I II l l- q 1 IIIII I1111 l With Mixture of Waterweed, I l i 111I I I i1\ / Soft -Stem Bulrush, it I l I l i l I i l l ll IIII i and Cattail or 1 approved e ual. Plant in accordance with I l I i l 1 I I I I II I II SWM Handbook-Std. 3.05 LHI I I I IIIII IIII 1 Exish� \ \h,1' '�\\-mpok \y\\ \\ 1 DBn iYRq 265e� I �I I I I �i Il II II III II l 11 I 1 l ll I i li I11/ I II I I 1 6`0- 11 ll 1 1 I 1 1 1 III III 11 I II'1 i t JO "0, I I I I I I I 11 52 I I i I I�xjstingl P�rManlenil ' I Myinfenpn e Ee4errlenl G 1265 II I I I I o m Vo- ki INN \ \ \ \ 1 THIS LINE INDICATES \ \ RR p. RET; AVA up- ' /// Nov P THE SEPARATION BETWEEN SWM-2 AND J SDP201400075\ 0 m I< I 6 6 Z ' w 30' Trail and S a'`> IAccess Easemen Y I � 10 30 0 30 60 90 I 1 ■ �►rrrr► ' i � I-'P SCALE: 1 = 30' Weir Report Hydraaow Express Extemionfor Aubdeak®Aub MCiAl3Mby AuWmk, Inc. Wednesday Aug 132014 SWM-1 Sediment Forebay Trapezoidal Weir Highlighted Crest = Sharp Depth (ft) = 1.85 Bottom Length (ft) = 14.00 Q (cfs) = 131.26 Total Depth (ft) = 2.00 Area (sgft) = 32.74 Side Slope (z:1) = 2.00 Velocity (lUs) = 4.01 Top Width (ft) = 21.40 Calculations Weir Coeff. CIA, = 3.10 Compute by: Known Q Known Q (cls) = 131.26* Depth (ft) SWM4 Sediment Forebay Depth (ft) 3.00 3.00 2.00 2.00 1.00 1.00 0.00 0.00 -1.00 0 - Weir 5 10 - W.S. -1.00 15 20 25 30 35 40 Length (ft) * 10-Year flow rate of 131.26 cfs from Hydrologic and Hydraulic calculations for SWM-1 SWM-1 SEDIMENT FORBAY SPILLWAY NOT TO SCALE Embankment EIev.= 2 Weir EIev.=356.0' EMERGENCY SPILLWAY DETAIL J 1(SECTION B-B) SW14 NOT TO SCALE Forebay Bottom = 346.0 100 Yr. EIev=357.00' Grass Weir (Outfalls Into Rip -Rap Channel With Same Section) Top of Dam EIev = 352.25 SWM-1 FOREBAY DETAIL 6 SECTION B-B SW14 HORIZ. SCALE: 1"=12' VERT. SCALE: 1"=6' 7 SWM-1 DETAIL SW14 HORIZ. SCALE: 1"=6' VERT. SCALE: 1"=3' 25° V-NOTCH WEIR. Elev. = 353.80' 3.0" Orifice*, Elev. = 349.60' Elev. = 348.60' Bottom EIev Pond 1 = 344.0' 10 ntl- vatic Ch 0 Short Version BMP Computations For Worksheets 2 -6 Albemarle County Water Protection Ordinance: Modified Simple Method Plan: cascade - Pond t Water Resources Area: Development Area Prepares Dominion Engineering _ Date: 1/3112013 Project Drainage Area Designation Pool L storm pollutant export in pounds, L= (P(Pj)RW12 ] [ C(A)2.72 ] Rv mean runoff coefficient, Rv=0.05+0.009(0 Pj small storm conection factor, 0 9 1 percent Imperviousness P annual precipitation, 43' In Albemarle A project area in acres in subject drainage area, C Pollutant concentration, mgll or ppm target phosphorus f factor applied to RR V required treatment volume in cy, 0.5" ow.+impew.. area = A(043560(G51l2y27 RR required remoal, L(post)-fx Lgi %RR removal eficiency , RR1004(pos9 Imnervinus cave, Commutation 1valuea In feet a xi ben Item pre,ree,lopment Area postdevelopment Area Roads & Parking Length Width subtmel Length Width subtotal 0 0 101059 0 0 101059 0 o 0 0 0 10890 0 1 ol ol 0 0 101059 0 111949 Driveways Length Width Iw. subtotal Length Width m. subtotal and walks 1 0 0 0 0 0 0 0 0 0 0 0 0 0 01 01 0 0 0 0 0 al ol 1 2 3 4 1 2 3 4 0 0 0 Gravel areas Area Area x 0.70 = 0 4358 x 01= 3049.2 Structures Area W. subtotal Area W. subtotal o 0 43110 0 0 43560 0 0 0 ol ol 8534 ol ol 0 43560 1 1 1 0 50004 Actively -grazed pasture & Area Area yards and cultivated turf 752480 x 0.08= 12198.8 217800 x 0.08= 17424 Active crop land Area Area x 0.25= 0 x0.25= 0 Other Impernous Areas 0 0 ImperviousCover Kpre) I(Poso Rv(p v 0.2424 281.7 New Development (For DevelopmentArea& existing Ira pervious cover 2") C f I (pre)' Rvlpre) ypre) L(pos0 RR % RR Area Type 0.70 1.Oo 20% 0.23 28,58 29.38 078 3% Development Area 0.35 1.00 0% 0.21 13.05 14.68 1.63 11% Drinking Water Watersheds 0 40 1 00 1% 0 21 14.92 16.78 186 11% Other Rural Land `min. values Redevelopment (For Development Areas, existing imperviouscover> 20%) C f I (pre)' Rv(pre) L[pre) L(post) RR % RR Area Type 0.70 0.90 2l1% 0.23 28.58 29.38 3.fi4 12% Development Area 0,35 0.85 0% 021 13,05 14.68 359 24% Drinking Water Watersheds 0.40 0.85 0.21 14.92 16.78 4.10 Other Rural Land Interim Manual, Page 70 rev. 16 Feb 1998 GEB Embankment Elev.-352. IYGII LIG V.-JJV.V EMERGENCY SPILLWAY DETAIL + (SECTION A -A) SW14 NOT TO SCALE 10' Aquatic Bench .,_ervious Core* *Impervious core shown for informational purposes only. Final design to be provided by geotechnical engineer. zi� Inv=346.57 8'0A.5' Concrete Base Embed 6" in Concrete Elev. = 348.6 SWM-1 Bottom = 344.0 Top of Dam EIev = 358.00 (~ 8' 68.28'-30" HDPE @ 1.90% Cutoff Trench* Short Version BMP Computations For Worksheets 2 -6 Albemarle County Water Protection Ordinance: Modified Simple Method Plan: cartel Subdivision Water Resources Area: Preparers Dominion Engineering Date: 911312014 Project Drainage Area Designation DAPOND2 PCSTDEVELOPMENT L storm pollutant export in pounds, L = [P(Pj)RW12 ] [ C(A)2.72 ] Rv mean bull coar1cient, Rv=0.05+0009(I) Pj small storm copection factor, 0.9 I percent imperviousness P annual precipitation, 43" in Albemarle A project area in acres in subject drainage area, N - - c pollutant concentration, mil or plan target phosphorus f factor applied to RR V required treatment volume in cy, 05" over imperv. area = A(I)43560(O.S192y27 RR required remoal, L(post) -fx L(pre) %RR removal eft amity , RR100luident) Impervious Cover Computation hialues in feet & spuare feet) Area ter predevelopment Area postdevelopment Area Roads & Parking Length Width subtotal 0 Length Width subtotal 152480 0 0 0 152460 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Driveways Length and wall 0 0 Width 0 0 W. 0 0 subtotal 0 0 0 0 Length Width m. sudoal 82784 0 0 0 SB 0 0 0 2395Bl188 0 0 0 0 1 0 2 3 4 0 2 3 4 0 Gravel areas Area x 0.70 = 0 Area x 0.70 = 3049.2 4358 Structures Area 0 0 0 no. o 0 0 subtotal zneo 0 0 21780 Area 0 ol W. 0 ol 1 subtotal 18e6o1 240oz 1 0 210003 Actively -grazed pasture & yards and cultiated turf Am 982878 x O.OB= 7701d.08 Area 844801 x 0.08= 51588.08 Active crop land Area x 0.25- 0 Area x0.25= 0 Other Impervious Areas (Future ImperviousCover Development Town' Phase) 0 5% 300900 Ilprel IUMS9 Rvlpost) V 0,41 1234.3 New Development For Development Areas, existing Impervious cover 20% C f I (pre)' RV(Pre) L[pre) LlPost) RR %RR Area Type 0.70 1.00 20% 0,23 64,30 115.43 51.13 44% Development Area 0,35 1.00 0% 0.09 13,25 57,71 4446 77% Drinking Water Watersheds 0.40 1.Do 1% 009 15.15 65.96 5081 77% Other Rural Lend `min. values Redevelopment (For Development Areas, existing impernouscover> 20%) C f I (pre)' RV(Pre) L(pre) L(post) RR %RR Area Type 0.70 0.90 20% 0.23 64.30 11543 57.56 50% Development Area 0,35 0,85 0% 0.09 13.25 57.71 4645 80% Drinking Water Watersheds 0.40 0.85 ._Ala 0.09 1 15.15 65.96 53.08 80% Other Rural land Interim Manual, Page 70 rew. 16 Feb 1998 GEB inn v_ = 349. Emeraen mpervious Core** BMP CALCULATIONS SW14 SCALE: 1"=100' Expanded Steel Grote (T,T 1� 12 (/\ WELD (TYP.) 0 < 1 1/2" X 1 1/2" X 1/4- STEEL ANGLE LWD P.) Expanded Steel GrateOpen'ng Detail 2J-3 LB PER FT2 Not To Scale EXPANDED STEEL GRATE BASED ON 25 22a' L03" .2W" LOW FLOW OPENING 30 1344` 1 940" 1 264' /16'" HOLES AS SHOWN LO (TYP.) 1 1/2" X 1 1/2" X 1/4" STEEL ANGLE (TYP.) 1 1/2" X 1/4" STEEL .. 3.. 3. STOCK WELDED TO BASE AS SHOWN GENERAL NOTES FOR TRASH RACK 1. STEEL TO CONFORM TO ASTM A-36. 2. ALL SURFACES OF TRASH RACK(S) MUST BE HOT DIPPED GALVANIZED AFTER FABRICATION, 3. TRASH RACK(S) TO BE FASTENED TO WALL WITH 1/2" MASONRY ANCHORS. TRASH RACK(S) TO BE REMOVABLE. 4. TRASH RACK(S) TO BE CENTERED HORIZONTALLY OVER THE OPENING. 5. FABRICATOR MAY MODIFY COMPONENTS OF TRASH RACK FRAME TO IMPROVE CONSTRUCTABILITY OF TRASH RACK. MODIFICATIONS MUST BE APPROVED BY MCDPS PRIOR TO FABRICATION. * DETAIL TAKEN FROM MONTGOMERY COUNTY, MARYLAND WATER RESOURCES SPECIFICATIONS. Iwav = 356.00' 5_'� ORIFICE TRASH RACK sue/ NOT TO SCALE *Trash rack to be installed on orifice as s on detail 5/SW14 or approved equal. **Impervious core and cutoff trench shown for informational purposes only. Final design to be provided by geotechnical engineer. �$oTH Op `te � rf V 7 9 Dustin E. Greene Lic. No. 55833 A+0- 02/1e/21 ti}y O93IONA1, '5 1.5 yr. Elevation = 354.09' 2 yr. Elevation = 354.29' 10 yr. Elevation = 356.03' 100 yr. Elevation = 357.00' ES-1 W w g N U) W M LU NQ E 2 ¢o ZO QQ O� g >0 Q WILL TO V1 itW J_J 4O ILZ Qxxxii �au I W V O% Q 2 (3 �ffi I O o Q 'K Q U) 2 O = (o N v O� =Q Q to Q Q GO w to 0 GO Z r 111 01� g rn 2 0) 0 W o a REVISIONS VSMP AMENDMENT MAY 24, 2018 EROSION STABILIZATION AREA ADDED AUG. 22, 2018 COUNTY COMMENTS SEPT. 17, 2018 COUNTY COMMENTS OCT. 2, 2018 VSMP AMENDMENT FEB 19, 2021 DATE APR. 17, 2014 SCALE AS SHOWN J W LL Z 1 2 cc Q e< U)> J a p° Z 1­ W W J IT W i o Q Q e< m a Z Q w 0 U e< N W Cl)) W v Z U UDE o U) FILE NUMBER 12.0065 Inv = 344.70 SHEET Rip -Rap SW14