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HomeMy WebLinkAboutWPO201600009 Plan - VSMP Minor Amendment 2016-08-12EROSION AND SEDIMENT CONTROL LEGEND & QUANTIITIES SAF 3.01 SA CRS 3.03 I 3.05 -- —X— ( P SAFETY FENCE PAVED CONSTRUCTION 1,800 S.F. ENTRANCE W/ WASH RACK CONSTRUCTION ROAD STABILIZATION SILT FENCE INLET PROTECTION DIVERSION �j B 3.14 SEDIMENT BASIN �P 3.18 QP OUTLET PROTECTION TS 3.31 TS TEMPORARY SEEDING P j 3.32 PS PERMANENT SEEDING M 3.35 M U MULCH N/A 5,120 L. F. 1,930 L.F. 5,166 CU. YD. DUST CONTROL TOTAL DISTURBED AREA = 26.43 ACRES 0 LD TRAI L V1 LLAG S LOCKS 10, 16117/18� & 3a w :A DI :4 1 M in M1 IIiIli EROSION CONTRO LA (W 020160000 ) i P-P-P-ni n EXISTING INTERMEDIATE CONTOUR EXISTING INDEX CONTOUR PROPOSED CONTOUR EXISTING EDGE OF PAVEMENT ___ Ex. EP PROPOSED EDGE OF PAVEMENT EP EXISTING CURB AND GUTTER Ex c&G PROPOSED CURB AND GUTTER CG -6 TRANSITION FROM CG -6 ROLL-TOP CG -6 ROLL-TOP EX. 15" RCP EXISTING STORM SEWER 15" RCP PROPOSED STURM SEWER EXISTING SANITARY SEWER - - - - PROPOSED SANITARY SEWER PROPERTY LINIE MARCH MOUNTAIN PROPERTIES LLC CIRCLE, SUITE 100C EASEMENT LINE CENTERLINE LIMITS OF CLEARING AND/OR GRADING EXISTING SPOT ELEVATION PROPOSED SPOT ELEVATION EXISTING TREE DRIP LINE EXISTING TREE: PROPOSED TREE SHEET INDEX EXISTING WATERLINE W/ TEE PROPOSED WATERLINE W/ TEE 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 CRITICAL SLOPE SLOPES TO BE SEEDED, MULCHED & TACKED VEHICLES PER DAY COUNT PROPOSED STREET NAME SIGN EXISTING SIGN PROPOSED SIGN SANITARY MANHOLE IDENTIFIER STORM DRAIN STRUCTURE IDENTIFIER ;SITE DATA `—'- --------�BASIN z, OWNER / DEVELOPER: MARCH MOUNTAIN PROPERTIES LLC CIRCLE, SUITE 100C CONTACT: DAVE BROCKMAN OLD TRAIL VILLAGE 06 CL SHEET 8 ------ 1005 HEATHERCROFT CELL' (702) --985-9088 ELL: VA, 22932 dave@oldtrail!village. com� -------EROSION PLAN PREPARER: ROUDABUSH, GALE, 6 ASSOCIATES 11•d .... Rte 250 • t 914 MONTICELLO ROAD LU � • v CHARLOTTESVILLE, VA. 22902 Ljju z • 0 0 (434) -977-0205 LLj TAX MAP PARCEL No: A PORTION OF 055EO-01-00-000A1 I Z ZONING: NEIGHBORHOOD MODEL DISTRICT IN ACCORDANCE WITH PROFFERS OF ZMA-04-024 APPROVED ON SEPTEMBER 14, 2005 USE: BLOCK 10:nJ.LEDBETTER 25 SINGLE FAMILY ATTACHED UNITS VICINITY MAP BLOCK 16: 7 SINGLE FAMILY ATTACHED UNITS SCALE: 10=10M FEET APPROVED 25 SINGLE FAMILY DETACHED UNITS by the Albemarle County BLOCK 17/18: Community Development Department 28 SINGLE FAMILY ATTACHED UNITS -/-o,L_Date � _m /;� �/6 SINGLE FAMILY DETACHED UNITS GENERAL EROSION AND SEDIMENT CONTROL NOTES ri1e GROSS RESIDENTIAL BLOCK 10 = 7.41 DWELLING UNITS PER ACRE DENSITY: BLOCK 16 = 4.93 DWELLING UNITS PER ACRE BLOCK 17/18 = 5.49 DWELLING UNITS PER ACRE PROPOSED 427,900 S.F. IMPERVIOUS AREA: DISTURBED ACREAGE: 26.43 AC MAGISTERIAL DISTRICT. WHITE HALL MAGISTERIAL DISTRICT STORMWATER MANAGEMENT: AS DEFINED BY THE OVERALL STORMWATER MASTER PLAN WATERSHED: LICKINGHOLE CREEK DATUM: VERTICAL - NAVD 88, HORIZONTAL - NAD 83 CRITICAL SLOPES: NO CRITICAL SLOPES EXIST WITHIN THE PROJECT LIMITS. FLOODPLAIN: THIS PROJECT IS NOT LOCATED WITHIN FLOODPLAIN LIMITS AS SHOWN ON FLOOD INSURANCE RATE MAP COMMMUNITY PANEL NUMBER 510006 0237 D. EFFECTIVE DATE: FEBRUARY 4, 2005. LANDSCAPING: SEE LANDSCAPING PLAN FOR PLANTINGS, SCHEDULE AND SPECIFICATIONS, NOTES NO EVIDENCE OF A BURIAL SITE WAS FOUND ON THIS PORTION OF PARCEL Al. THE STREAM BUFFERS) SHOWN HEREON SHALL BE MANAGED IN ACCORDANCE WITH THE ALBEMARLE COUNTY WATER PROTECTION ORDINANCE. THIS SITE IS NOT LOCATED WITHIN AN AGRICULTURAL -FORESTAL DISTRICT. THIS SITE IS LOCATED WITHIN THE WATERSHED OF A PUBLIC WATER SUPPLY RESERVOIR. ES -1: UNLESS OTHERWISE INDICATED, ALL VEGETATIVE AND STRUCTURAL EROSION AND SEDIMENT CONTROL PRACTICES WILL BE CONSTRUCTED AND MAINTAINED ACCORDING TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK AND VIRGINIA REGULATIONS VR 625-02-00 EROSION AND SEDIMENT CONTROL REGULATIONS. ES -2: THE PLAN APPROVING AUTHORITY MUST BE NOTIFIED ONE WEEK PRIOR TO THE PRE -CONSTRUCTION CONFERENCE, ONE WEEK PRIOR TO THE COMMENCEMENT OF LAND DISTURBING ACTIVITY, AND ONE WEEK PRIOR TO THE FINAL INSPECTION. ES -3: ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR TO OR AS THE FIRST STEP IN CLEARING. ES -4: A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL PLAN SHALL BE MAINTAINED ON THE SITE AT ALL TIMES. ES -5: PRIOR TO COMMENCING LAND DISTURBING ACTIVITIES IN AREAS OTHER THAN INDICATED ON THESE PLANS (INCLUDING, BUT NOT LIMITED TO, OFF-SITE BORROW OR WASTE AREAS), THE CONTRACTOR SHALL SUBMIT A SUPPLEMENTARY EROSION CONTROL PLAN TO THE OWNER FOR REVIEW AND APPROVAL BY THE PLAN REVIEWING AUTHORITY. ES -6: THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY ADDITIONAL EROSION CONTROL MEASURES NECESSARY TO PREVENT EROSION AND SEDIMENTATION AS DETERMINED BY THE PLAN REVIEWING AUTHORITY. ES -7: ALL DISTURBED ARES ARE TO DRAIN TO APPROVED SEDIMENT CONTROL MEASURES AT ALL TIMES DURING LAND DISTURBING ACTIVITIES AND DURING SITE DEVELOPMENT UNTIL FINAL STABILIZATION HAS BEEN ACHIEVED. ES -8: DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN APPROVED FILTERING DEVICE, ES -9: THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES PERIODICALLY AND AFTER EACH RUNOFF -PRODUCING RAINFALL EVENT. ANY NECESSARY REPAIRS OR CLEANUP TO MAINTAIN THE EFFECTIVENESS OF THE EROSION CONTROL DEVICES SHALL BE MADE IMMEDIATELY. APPROVALS DEPARTMENT OF COMMUNITY DEVELOPMENT PLANNING / ZONING ENIGINEERING INSPECTIONS AR(CHITECTUAL REVIEW BOARD I DEPARTMENT OF FIRE RESCUE I I I ALBEIMARLE COUNTY SERVICE AUTHORITY__ Pi REVISIONS COUNTY COMMENTS March 15, 2016 COUNTY COMMENTS' May 13, 2016 COUNTY COMMENTS May 23, 2016 AMENDMENT August 11, 2016 DATE Jan, 25, 2016 FILE NUMBER 8053 SHEET 1 Of 9 i 06 R• 11•d • t • LU � • Ljju • 0 0 LLj FILE NUMBER 8053 SHEET 1 Of 9 of rl TRAIL PROPERTY LINE REVISIONS COUNTY COMMENTS March 15, 2016 COUNTY COMMENTS May 13, 2016 COUNTY COMMENTS May 23, 2016 AMENDMENT August 11, 2016 DATE Jars. 25,2016 SCALE 1"=100' z 0 A_ Cm 0 J, z CC OL LLI (D Cr. z QE W- @) 0 (.5 > 0 Lj LL CL z > LLJ a w 2 • > 00 C-rj Ckj < Ef" (b I• Cl) z C� 060 Z cr_ 0 LJL 0 w U:-,) C*4 rf. uj CL uj 0 z I'L o< 00 Z w z 0 0 uj (L % z REVISIONS COUNTY COMMENTS March 15, 2016 COUNTY COMMENTS May 13, 2016 COUNTY COMMENTS May 23, 2016 AMENDMENT August 11, 2016 DATE Jars. 25,2016 SCALE 1"=100' FILE NUMBER 8053 II SHEET 2 of 0 z A_ 0 Cl) CC LLI od z 0 (.5 Co LLJ a > Cl) z 060 Z 0 w ui rrw o< 00 Z Co w z w FILE NUMBER 8053 II SHEET 2 of 0 REVISIONS COUNTY COMMENTS March 15, 2016 COUNTY COMMENTS May 13, 2015 COUNTY COMMENTS May 23, 2016 AMENDMENT August 11, 2016 DATE Jan. 25, 2016 SCALE ill = 60' FILE NUMBER 6053 SHEET 3Of9 • ' cm • f ` .. i CL •0 o a 1 a ► LH 1 91 CD w LU ♦ � 0 Cr e • • UI • a 0 LL CO) LL • cli i • i t CL LU • 0 • 4 • a i REVISIONS COUNTY COMMENTS March 15, 2016 COUNTY COMMENTS May 13, 2015 COUNTY COMMENTS May 23, 2016 AMENDMENT August 11, 2016 DATE Jan. 25, 2016 SCALE ill = 60' FILE NUMBER 6053 SHEET 3Of9 ;77j IV NXI-k OP2A (SEE DETAIL`{ SHEET 7) AATH OF 4% WILLIAM J. LEDBETTER Lic. No. 1507—B 160�-qlvo S u Rlj,0 0:/ PLAT RECORDED La D. B. 4257 pp. 377-388 SCALE I" = 60' 60 30 0 60 IPC SCALE IN FEET Z C) C, Il r in ccmm < C) z ) 0 • w 0 -,j CR 3:6 C� 0 LL Lu IL 00 z Q. Lu A T- l4tt o) w z 0 X AATH OF 4% WILLIAM J. LEDBETTER Lic. No. 1507—B 160�-qlvo S u Rlj,0 0:/ PLAT RECORDED La D. B. 4257 pp. 377-388 SCALE I" = 60' 60 30 0 60 IPC SCALE IN FEET REVISIONS COUNTY COMMENTS March 15, 2016 COUNTY COMMENTS May 13, 2016 COUNTY COMMENTS May 23, 2016 AMENDMENT August 11, 2016 DATE Jan. 25,2016 SCALE lit = 60' Z C) C, rz r in ccmm < C) z ) 0 • w 0 -,j CR 3:6 C� 0 LL Lu IL 00 z Q. Lu A T- l4tt o) w z 0 X REVISIONS COUNTY COMMENTS March 15, 2016 COUNTY COMMENTS May 13, 2016 COUNTY COMMENTS May 23, 2016 AMENDMENT August 11, 2016 DATE Jan. 25,2016 SCALE lit = 60' FILE NUMBER 8053 SHEET 4 of 9 Z C\l 0 0 w (y) I= F— w 06 z 0 C) 00 �— < CL z ui F0 > L., (D Ui (1) z 06 0; 0< Z C) 0, C/5 021 Cr. < Z 00v • Cr LLJ w 0 0 Z LLI z w FILE NUMBER 8053 SHEET 4 of 9 f I IN 1 N l -ices 1 PI f it I i �jr�7 iter -pie .i>(1 til y I[- r- c i t9i f ,I:hd tl TION A- _- lilh li11iJsl 'a ato hip of l tilt:il 1111IIA. the i(it-:ti111ei.1 AAIB ll a iiilll1111.111i11 1114AI t:ballL=ock .(111(off val-e:11(blAvIii- cS 4 1;'..1111 p tvitlt a (fialilttef I -A 1, `� IIIC11es foralft!'d. nate �,ollstallt 11P Fs` sall8 `t`Ji "Al Nvatel, ulu;A be a41"'ay iUP111 t11t� elit:i1lice to (MI djl)ai�Fvctt settllll4 alfea to ft-111ove ,sedlinelll, :11 Shall tb� plevelited f aF111 Cllt8lili!s 'Aii1111 t1i';-F111 :, i:liti lle : til S'tltOif i lP1', r*: PPV WASH RACK. 1E � _ �:" Y:�:..I. SF SILT FENCE CONSTRUCTION OF A SILT FENCE (WITHOUT WIRE SUPPORT) 1. SET THE STAKES. 2. EXCAVATE A 4"X 4" TRENCH UPSLOPE ALONG THE LINE OF STAKES. '1!i £'MAX. lis FLOW r J III f�11'0. 3. STAPLE FILTER MATERIAL TO STAKES AND EXTEND IT INTO THE TRENCH. `' ` 4. BACKFILL AND COMPACT THE EXCAVATED SOIL. SHEET FLOW INSTALLATION (PERSPECTIVE VIEW) SF/STONE NOT REQUIRED AFTER SLOPES ARE STABILIZED DOWNSLOPE OF OUTFALL POINTS A SHOULD BE HIGHER THAN POINT B. DRAINAGEWAY INSTALLATION (FRONT ELEVATION) Adapted from Installation_ of Straw and Fabric Filter Barriers for Sediment Control,% DSWC VLAIL. Sherwood and Wyant ST SEDIMENT TRAP 1' VARIABLE *SEE PLATE 3.13-1 COARSE AGGREGATE CLASS E RIPRAP CROSS SECTION OF OUTLET CLASS L RIPRAP LENGTH (IN FEET) _ 6 X DRAINAGE AREA (IN AC.) COARSE AGGREGATE r (- EXCAVATED EXCAVATED AREA FILTER CLOTH **COARSE AGGREGATE SHALL BE VDOT #3, #357 OR #5 OUTLET (PERSPECTIVE VIEW) SOURCE. VA. DSWC �P INLET PROTECTION BL 0 CK & GRAVEL CURB INLET SEDIMENT FIL TER CURB INLET `1> WIRE SCREEN RUNOFF OVER LF OW WATER WITH SEDIMENT- SEDIMENT SOURCE: VA. DSWC GRAVEL FILTER WIRE SCREEN / 2" X 4" WOOD STUD CONCRETE BLOCK FILTERED `NATER �'P!__IC; TIC;iI`J THIS METHOD OF INLET PROTECTION IS APPLICABLE AT CURB INLETS WHERE AN OVERFLOW CAPABILITY IS NECESSARY TO PREVENT EXCESSIVE PONDING IN FRONT OF THE STRUCTURE. * GRAVEL SHALL BE VDOT #3, #357 OR #5 COARSE AGGREGATE DIVERSION DIKE PLATE. 3.13-2 PLATE 3.07--8 Dv DIVERSION DIVERSION 10% SETTLEMENT i 0.3' FREE BOARD DESIGN FLOW DEPTH TYPICAL VEE -SHAPED DIVERSION Source: Va. DSWC Plate 3.12-1 TEMPORARY SEEDING MIXTURES OTS FOR THE PIEDMONT AREA INFORMATION FROM TABLE 3.32-C OF THE VA ESC HANDBOOK IS PROVIDED BELOW FOR SEEDING SELECTION TOTAL LBS. PER ACRE MINIMUM CARE LAWN 200-250 LBS -COMMERCIAL OR RESIDENTIAL 90-100% KENTUCKY 31 OR TURF -TYPE TALL FESCUE 0-10% IMPROVED PERENNIAL RYEGRASS 0-10% KENTUCKY BLUEGRASS GENERAL SLOPE (3:1 OR LESS) 128 LBS KENTUCKY 31 FESCUE 2 LBS RED TOP GRASS 20 LBS SAEASONAL NURSE CROP ** ** USE SEASONAL NURSE CROP IN ACCORDANCE WITH SEEDING DATES AS STATED BELOW: MARCH, APRIL THROUGH MAY 15TH ANNUAL RYE MAY 16TH THROUGH AUGUST 15TH FOXTAIL MILLET AUGUST 16TH THROUGH SEPTEMBER, OCTOBER ANNUAL RYE NOVEMBER THROUGH FEBRUARY WINTER RYE FERTILIZER (10-20-10 OR EQ) SHALL BE APPLIED AT THE RATE OF 1000 LBS/ ACRE. AGRICULTURAL LIME SHALL BE APPLIED TO SEEDBEDS AT TTHE RATE OF 90 LBS/ 1000 SQ. FT. SUGGESTED TEMPORARY SEEDING MIXTURE F�R 1IIJL I 1 r. 1" 1,12'r) I E:` /�,i l=1i SSI FEMBEIR FF DR ,AR' 15: `' 0% A �J I �\I._ R I t- :�,t 50)% �+"v M I�__i-� Rt E 1 00 I. SACRE I EBRI'AR 16 r,"RIL 30: A :NUA.l... RYE. 100 IL31_/'r C,,1R..: E , r AU L' T: P f J P:111 l `,;.) I F5` 'AC ISE 01 i_ Op r I0I',1` X1:1 ":E.. \ P, EROSION A,I .L .`_E - 1 .11=i JT i Uf l Ef1Ul_ f-r"`,f`4D`uC(_il SUGGESTED PERMANENT SEEDING MIXTURE ME: _ T(__) S,/ACRE FLRTI ,ZEE. 1") -1O 1,000 L B` /ACR. 1 A ('1 11A 15: KENH-11ICKY 51 FESCUE 'F0 / ` '`Z ArIIJ J A R 1 E-_ ,/''j( 'F M A ( 1,6 A ' ,J I 15 : KE W1 I I J C K Y 31 FE``J(_ UE '200 1 BSS/ Ar'RE, F') X I A!L 11:LLE 1F O ` -Cir E 41 -1 i6--0Ci 10130,KFNIUCI.`,171 FESCUE 2CJ0 LBS/ACRE , NINFIJ I, RYE 20I_IBS ACRE VE1v `30k I EI3RUARY: KE!"J , UCI,I' 41 ESCUE 2CR0 LB:��i`�.CRE, 1��1 IJ � R RYE 2D LG �, �CRi:: PERMANENT SEEDING MIXTURES (PS) FOR THE PIEDMONT AREA TABLE 25 TOTAL LBS. PER ACRE MINIMUM CARE LAWN - COMMERCIAL OR RESIDENTIAL 175-200 LBS. - KENTUCKY 31 OR TURF -TYPE TALL FESCUE %95-100% - IMPROVED PERENNIAL RYE GRASS 0-5% - KENTUCKY BLUEGRASS 0-5% HIGH MAINTENANCE LAWN I TABLE 26 100% TEMPORARY SEEDINGS BY RATES, DEPTHS, AND DATES LESS) - KENTUCKY 31 FESCUE Seeding Rate Planting depth 36 Seedingzones 37 and Seeding 9 Date 38 Species3 Per Lbs/1000 LOW -MAINTENANCE SLOPE (STEEPER THAN 3:1) 7a and 7b 6b 6a and 5b - RED TOP GRASS acre Sq. ft (Inches) 2/1- 5/1- 8/15- 3/1- 5/1- 8/15- 3/15- 6/1- 8/1- . . . . . . . . . FOXTAIL MILLET AUGUST 16TH THROUGH OCTOBER 31ST. . . . . . . . . . . .ANNUAL RYE NOVEMBER 1ST THROUGH FEBRUARY 15TH 4/30 8/14 11/30 4/30 8/14 11/15 5/31 7/31 10/31 Choose one: TO ANY SLOPE OIR LOW MAINTENANCE MIX DURING WARMER SEEDING PERIODS; ADD 10- 20 LBS./ACRE IN MIXES. 9.2 ment and every 4-5 BY Birdsfoot trefoil f BY years thereafter. BY Barley 2.5 bu. 2.80 1-2 X - 10/15 X - 10/15 X - 10/1 Oats 3 bu. 2.21 1-2 X - - X - - X - - Rye39 2.5 bu. 3.22 1-2 X - X X - X X - X Barley or Spring the year closer than 4" if & serice lespedeza 500 11.5 following establish- occasional mowing is fairly uniform 5-10-10 Rye Plus 150 lbs. 3.45 1 X X 10/15 X X 10/15 X X 10/1 Foxtail X X X X X X X X X millet40 and Ky bluegrass; bluegrass, hard December, and closer than 3" fescue mixture: Weeping Ivegrass4l 4 lbs. 0.09 1/4-1/2 - X - - X - - X - Annual ryegrasS1/4-1/2 50 lbs. 1.15 X - 11/1 X - 11/1 X - 8/15 Millet42 50 lbs. 1.15 1/2 - X - - X - - X - ltiZ Applicable on slopes of 3:1 or flatter 37/ Refer to figure A - Adopted from USDA, ARS Miscellaneous Publication #1475, January 1990 38 Between fall and spring seeding dates, use mulch only if ground is frozen and reseed when thawed 33 May be used as a nurse crop for late fall/early winter permanent seedings, add 56 lbs/ac. to the permanent seeding mixture 40 Maryland State Highway Administration Temporary Seed Mix May be used as a nurse crop for mid -summer permanent seedings. Add 2 lbs/ac 41-Z to permanent seed mix. May be used as a nurse crop for mid -summer permanent seedings. Add 10 lbs/ac. 42 to the permanent seeding mix. INFORMATION FROM TABLE 3.32-C OF THE VA ESC HANDBOOK IS PROVIDED BELOW FOR SEEDING SELECTION TOTAL LBS. PER ACRE MINIMUM CARE LAWN 200-250 LBS -COMMERCIAL OR RESIDENTIAL 90-100% KENTUCKY 31 OR TURF -TYPE TALL FESCUE 0-10% IMPROVED PERENNIAL RYEGRASS 0-10% KENTUCKY BLUEGRASS GENERAL SLOPE (3:1 OR LESS) 128 LBS KENTUCKY 31 FESCUE 2 LBS RED TOP GRASS 20 LBS SAEASONAL NURSE CROP ** ** USE SEASONAL NURSE CROP IN ACCORDANCE WITH SEEDING DATES AS STATED BELOW: MARCH, APRIL THROUGH MAY 15TH ANNUAL RYE MAY 16TH THROUGH AUGUST 15TH FOXTAIL MILLET AUGUST 16TH THROUGH SEPTEMBER, OCTOBER ANNUAL RYE NOVEMBER THROUGH FEBRUARY WINTER RYE FERTILIZER (10-20-10 OR EQ) SHALL BE APPLIED AT THE RATE OF 1000 LBS/ ACRE. AGRICULTURAL LIME SHALL BE APPLIED TO SEEDBEDS AT TTHE RATE OF 90 LBS/ 1000 SQ. FT. SUGGESTED TEMPORARY SEEDING MIXTURE F�R 1IIJL I 1 r. 1" 1,12'r) I E:` /�,i l=1i SSI FEMBEIR FF DR ,AR' 15: `' 0% A �J I �\I._ R I t- :�,t 50)% �+"v M I�__i-� Rt E 1 00 I. SACRE I EBRI'AR 16 r,"RIL 30: A :NUA.l... RYE. 100 IL31_/'r C,,1R..: E , r AU L' T: P f J P:111 l `,;.) I F5` 'AC ISE 01 i_ Op r I0I',1` X1:1 ":E.. \ P, EROSION A,I .L .`_E - 1 .11=i JT i Uf l Ef1Ul_ f-r"`,f`4D`uC(_il SUGGESTED PERMANENT SEEDING MIXTURE ME: _ T(__) S,/ACRE FLRTI ,ZEE. 1") -1O 1,000 L B` /ACR. 1 A ('1 11A 15: KENH-11ICKY 51 FESCUE 'F0 / ` '`Z ArIIJ J A R 1 E-_ ,/''j( 'F M A ( 1,6 A ' ,J I 15 : KE W1 I I J C K Y 31 FE``J(_ UE '200 1 BSS/ Ar'RE, F') X I A!L 11:LLE 1F O ` -Cir E 41 -1 i6--0Ci 10130,KFNIUCI.`,171 FESCUE 2CJ0 LBS/ACRE , NINFIJ I, RYE 20I_IBS ACRE VE1v `30k I EI3RUARY: KE!"J , UCI,I' 41 ESCUE 2CR0 LB:��i`�.CRE, 1��1 IJ � R RYE 2D LG �, �CRi:: PERMANENT SEEDING MIXTURES (PS) FOR THE PIEDMONT AREA TABLE 25 TOTAL LBS. PER ACRE MINIMUM CARE LAWN - COMMERCIAL OR RESIDENTIAL 175-200 LBS. - KENTUCKY 31 OR TURF -TYPE TALL FESCUE %95-100% - IMPROVED PERENNIAL RYE GRASS 0-5% - KENTUCKY BLUEGRASS 0-5% HIGH MAINTENANCE LAWN 200-250 LBS. - KENTUCKY 31 OR TURF -TYPE TALL FESCUE 100% GENERAL SLOPE (3:1 OR LESS) - KENTUCKY 31 FESCUE 128 LBS. - RED TOP GRASS 2 LBS. - SEASONAL NURSE CROP* 20 LBS. 1000 sf TOTAL 150 LBS. LOW -MAINTENANCE SLOPE (STEEPER THAN 3:1) Tail fescue makes - KENTUCKY 31 FESCUE 108 LBS. - RED TOP GRASS 2 LBS. - SEASONAL NURSE CROP* 20 LBS. - CROWN VETCH*`* 20 LBS. TOTAL 150 LBS. *USE SEASONAL 1NURSE CROP IN ACCORDANCE WITH SEEDING DATES AS STATED BELOW: FEBRUARY 16TH THROUGH APRIL 30TH. . . . . . . . . . . . ANNUAL RYE MAY 1ST THROUGH AUGUST 15TH . . . . . . . . . . . . . . FOXTAIL MILLET AUGUST 16TH THROUGH OCTOBER 31ST. . . . . . . . . . . .ANNUAL RYE NOVEMBER 1ST THROUGH FEBRUARY 15TH . . . . . . . . . . ANNUAL RYE ** SUBSTITUTE SERICEA LESPEDEZA FOR CROWNVETCH EAST OF FARMVILLE, VA (MAY THROUGH SEPTEMBER USE HULLED SERICEA, ALL OTHER PERIODS, USE UNHULLED SERICEA.) r IF FLATPEA IS USED IN LIEU OF CROWNVETCH, INCREASE RATE TO 30 LBS./ACRE. ALL LEGUME SEED MUST BE PROPERLY INNOCULATED. WEEPING LOVEGRASS MAY BE ADDED TO ANY SLOPE OIR LOW MAINTENANCE MIX DURING WARMER SEEDING PERIODS; ADD 10- 20 LBS./ACRE IN MIXES. 9.2 CPS)PERMANENT SEEDING FERTILIZATION &MAINTENANCE TABLE 24 Maintenance Fertilization for Permanent Seedings Use Soil Test Recommendation or Rates Shown Below Seeding Mixture Formulation Lbs. per Lbs. per Time Mowing Acre 1000 sf ' Tail fescue makes 10-10-10 500 11.5 Yearly, or as needed *Not closer than 3" up 70% or more or if occasional mowing of cover. 30-10-10 400 9.2 fall is desired. Crown vetch Spring the year Do not mow r following establish - Service lespedeza 0-20-10 400 9.2 ment and every 4-5 crownvetch Birdsfoot trefoil f years thereafter. Fairly uniform Fall the ear y Not required, not closer than 4" if stand of tall fescue & 5-10-110 500 11.5 following establish- occasional mowing is service ment and every 4-5 desired, and then in lespedeza, or i ll � � a years thereafter. fall after seed has birdsfoot trefoil. matured. w Not required. not weeping lovegross Spring the year closer than 4" if & serice lespedeza 500 11.5 following establish- occasional mowing is fairly uniform 5-10-10 ment and every 3-4 desired, and tall plant distribution years thereafter. after sericea has matured. September, Mow no closer than Red & chewings 20-10-10 250 5.8 30 days later 2" for red fescue fescue, Kentucky and Ky bluegrass; bluegrass, hard December, and closer than 3" fescue mixture: 20-10-10 100 2,3 May 20 -June -30, for fescue. if needed. 8" UPPEF 12" 2 090' Bt ANTI- VORTEX DEVICE DESIGN -72" ANTI -VORTEX 3/4"X8" BOLT A NUT, WASHER & LOCK WASBHER. USE 3"X3"'X1/8" GALVANIZED PLATE FOR ATTACHING PLATES TO FRAME --y A 18" LOWER ANCHOR TABS 48 RCP RISER - BOLT TO RCP RISER PLAN VIEW (4) 1.5"X1.5 X8" ANGLE (4) 3/8' GALVANIZED BOLTS (8) 3/8" WASHERS 72" ANTI -VORTEX TACKWELD ALL AROUND TOP IS 14 GAGE CORRUGATED METAL OR 1/8" STEEL PLATE. PRESSURE RELIEF HOLES MAY BE OMMITTED, IF ENDS OF CORRUGATIONS ARE LEFT FULLY OPEN WHEN THE TOP IS ATTACHED. CYLINDER IS 16 GAGE CORRUGATED METAL PIPE OR FABRICATED FROM 1/8" STEEL PLATE. NOTES: 1. THE CYLINDER MUST BE FIRMLY FASTENED TO THE TOP OF THE RISER. 2. SUPPORT BARS ARE WELDED TO THE TOP OF THE RISER OR ATTACHED BY STRAPS BOLTED TO TOP OF RISER. 21„ 8" MIN. LOCATION OF SUPPORT ANGLE (2)1.5"X1.5'X7.0' STEEL ANGLE 48" RCP RISER SECTION A -A �`$�,�Jx op v f� WILLIAM J. LEDBETTER Lic. No. 1507-B SND SURq,- � ■ REVISIONS COUNTY COMMENTS March 15, 2016 COUNTY COMMENTS May 13, 2016 COUNTY COMMENTS May 23, 2016 AMENDMENT August 11, 2016 DATE Jan. 25, 2016 PILE NUMBER 8053 SHEET 5Of9 Ik ' ' * .r w s r r � f w• i ll � � a w w REVISIONS COUNTY COMMENTS March 15, 2016 COUNTY COMMENTS May 13, 2016 COUNTY COMMENTS May 23, 2016 AMENDMENT August 11, 2016 DATE Jan. 25, 2016 PILE NUMBER 8053 SHEET 5Of9 SEDIMENT BASIN #1 (BMP L 3) (25 -YR. STORM ELEV.) MIN. 2.0' MIN. 3.0' MIN. 0.5') • MIN. 1.0' ., 67 C.Y./ AC. ' ..�. .... DRY STORAGE RISER CREST 67 C.Y./ AC. "WET "STORAGE .d DEWATERING _._.._.._ .__.._.._....._.. ....._.......... _.., DEVICE •• 4 00 11.0 660 i .. s 660 = r� Z 0 655 Uj IL Uj 655 J 650 650 DESIGN HIGH 'W 1-0 (2 5 -Yf. STORM EL V.) EL 6 645 �' TOP OFD M 645 EL V.= 640 00 IN BERM WIDTH -8.0' 640 640 635 48 RCP RISER 635 W/ 72' ANTI -VORTEX � (SEE DETAIL) -_ CREST ELEV.= 36.50 -- 630 `-- 630 19.9 C.Y. CL I RIPRA LEV -628.00 BOT BASIN 1 "MIN. EPTH 625 W NDERLYING F.F 625 93.00 LF OF " 0RCP @ 6.45 s2o 620 O O O PROPOSED GRADE o Cd Q0 615 - - - EXISTING GRADE � II 615 Z 0 Horizontal Scale = 1 :20 Vertical Scale = 1 :5 > z z 610 610 OO) M -n a0 00 .(D NCp ON t- LOd' O CO 0) t I'7 W d N r0 N N NN (D (D (D co (D (D (D (D (D iD 10+00 +50 11+00 +50 12+00 +50 13+0 DAM CONSTRUCTION NOTES: 1. GEOTECHNICAL CONSULTANT TO SPECIFY DAM EMBANKMENT MATERIAL, SEEPAGE CONTIROL DEVICES, CUT-OFF TRENCH DESIGN, CULVERT BEDDING REQUIREMENTS, AND OTHER APPROPRIATE GEOTECHNICAL DESIGN REQUIREMENTS. 2. FOUNDATION AND ABUTMENT AREA EXTENDING 10' BEYOND DAM FOOTPRINT SHALL BE CLEARED, GRUBBED AND STRIPPED OF ALL VEGETATION TOPSOIL AND/OR ORGANIC SOIL AND OTHER UNSUITABLE= MATERIALS. 3. AFTER CLEARING, GRUBBING, STRIPPING, AND REMOVING ANY OTHER UNSUITABLE MATERIALS, THE SUBGRADE SHALL BE PROOF -ROLLED WITH COMPACTION EQUIPMENT UNDER THE OBSERVATION OF A QUALIFIED ENGINEER. THE COMPACTION EQUIPMENT SHALL CONSIST OF THE HEAVIEST POSSIBLE EQUIPMENT THAT WILL NOT CAUSE DISTURBANCE OF SUITABLE SUBGRADE SOILS. EXCESSIVELY SOFT OR UNSUITABLE MATERIALS SHALL BE REMOVED AND REPLACED WITH COMPACTED FILL. WHERE ROCK IS EXPOSED AFTER STRIPPING OR UNDERCUTTING, ALL LOOSE ROCK MATERIAL SHALL BE REMOVED PRIOR TO PLACING COMPACTED FILL. ROCK SUBGRADES SHALL BE INSPECTED AND APPROVED BY INSPECTOR OR ENGINEER PRIOR TO PLACEMENT OF FILL. 4. COMPACTED FILL SHALL NOT BE PLACED PRIOR TO PERFORMING THE REQUIRED FOUNDATION AND ABUTMENT PREPARATION, OR ON ANY FROZEN SURFACE. COMPACTED FILL SHALL EXTEND TO THE FILL LIMIT LINES AND GRADES INDICATED ON THE APPROVED CONSTRUCTION PLAN, COMPACTED FILL MATERIAL SHALL BE OF THE TYPE CLASSIFICATION SYMBOL SPECIFIED BY THE GEOTECHNICAL CONSULTANT, OR OF A BETTER QUALITY MATERIAL AS DEFINED BY THE UNIFIED SOIL CLASSIFICATION SYSTEM (USCS). RESTRICTIONS ON LIQUID LIMIT AND PLASTICITY INDEX OF MATERIAL MAY BE INCLUDED WHERE APPLICABLE. COMPACTED FILL SHALL CONSIST OF MATERIAL FREE OF ORGANIC MATTER, RUBBISH, FROZEN SOIL, SNOW, ICE, AND PARTICLES WITH SIZES LARGER THAN S' OR ANY OTHER DELETERIOUS MATERIAL. 5. COMPACTED FILL SHALL BE PLACED IN HORIZONTAL LAYER OF 8"-12" IN LOOSE THICKNESS. ACTUAL LIFT THICKNESS SHALL BE SPECIFIED BY THE GEOTECHNICAL CONSULTANT. THE MOISTURE CONTENT SHALL BE CONTROLLED SUCH THAT COMPACTION IS ACHIEVED WITHOUT YEILDING OF THE SURFACE. EACH LAYER SHALL BE UNIFORMLY COMPACTED WITH SUITABLE COMPACTION EQUIPMENT TO AT LEAST 95% OF STANDARD PROCTOR MAXIMUM DENSITY IN ACCORDANCE WITH ASTM D-698, AASHTO T-99, OR VDOT SPECIFICATIONS. ANY LAYER OF FINE GRAINED FILL WHICH BECOMES SMOOTH SHALL BE SACRIFICED TO A DEPTH OF 2" TO ALLOW ADEQUATE BONDING BETWEEN LAYERS. 6. COMPACTED FILL WITH A MOISTURE CONTENT WHICH WILL NOT PERMIT COMPACTION TO THE SPECIFIES DENSITY STANDARD SHALL BE SACRIFICED, DRIED, OR WETTED AS NECESSARY TO PERMIT PROPER COMPACTION. SCALE 1" = 20' 20 10 0 20 4( SCALE IN FEET DEMENT BASIN #1 Tot ainage Area- 9.90 acres Basin n Volumes: Wet Stor Minimum e Req'd. = 67 cy * 9.90 = 663 cy Available Bas olume Prov'd. = 688 c 631.50 Depth to Clean Elev. = 1.00 ft Dry Storage - Minimum Volume = 67 cy * 0 acres = 663 cy Available Basin Volu roVd. = 48 cy © 637.10 Dewatering Orifice Inve 63 Cleanout Elev. = 630.50 Basin Design Elevations: Top of Dam = 640.00 Design High Water = .81 (2 (air Storm) Crest of Riser = 6 0 Toe of Dam = 6 Principal S ill esi n: Riser Dia. - ' Trash Ra a. = 72" Trash R Ht. = 21" Barrel gth = 93.0' Barr la. = 30" In t 30" Barrel = 622.00 oP OUTLET PROTECTION PIPE OUTLET CONDITIONS A A 'IPE OUTLET TO FLAT REA WITH NO DEFINED HANNEL L a 0% I d SECTION A -A FILTER CLOTH KEY IN 6"-9"; RECOMMENDED FOR ENTIRE PERIMETER I 3d o (MIN.) 'IPE OUTLET TO WELL )EFINED CHANNEL v 7. _ d SECTION A -A FILTER CLOTH KEY IN 6"-9'; RECOMMENDED FOR ENTIRE PERIMETER NOTES: 1. APRON LINING MAY BE RIPRAP, GROUTED RIPRAP, GABION BASKET, OR CONCRETE. 2. La IS THE LENGTH OF THE RIPRAP APRON AS CALCULATED USING PLATES 3.18-3 AND 3.18-4. 3. d = 1.5 TIMES THE MAXIMUM STONE DIAMETER, BUT NOT LESS THAN 6 INCHES. Source. Va. DSWC Plate 3.18-1 SEDIMENT DA SIN S CHEMA TI C ELE VA. TIONS DESIGN HIGH WATER (25 -YR. STORM ELEV.) MIN. 2.0' MIN. 3.0' MIN. 0.5') • MIN. 1.0' ., 67 C.Y./ AC. ' ..�. .... DRY STORAGE RISER CREST 67 C.Y./ AC. "WET "STORAGE .d DEWATERING _._.._.._ .__.._.._....._.. ....._.......... _.., DEVICE SEDIMENT CLEANOUT POINT" I_-, DESIGN ELEVATIONS WITHOUT EMERGENCY SPILLWAY (RISER PASSES 25 -YR. EVENT) SOURCE: VA. DSWC EXAMPLE PLAN VIEWS 0 BAFFLE /ii SEDIMENT DASINS INFLOW D D/2 NO SCALE PLATE. 3.14-2 L = TOTAL DISTANCE FROM THE POINT OF INFLOW AROUND THE BAFFLE TO THE RISER. NORMAL POOL ~� D/2 L - RISER D - _ BAFFLE NORM"' I- SOURCE; USDA -SCS EVENT EXCAVATED INTO SUITABLE MATERIAL 4' MIN 27.95 49.53 64.50 HNI �U.y SHEETS OF 4' X 8' X 1/2" EXTERIOR PLYWOOD OR EQUIVALENT 4' R IR SEDIP PRIMARY (CFS) 0.75 hh,. 13.08 OLITLET PROTEC Y.�CC�1�, IPI OPI A `° 18" MIN. DEPTH J /UNDERLYING F.F 6,. RISER CREST ELEVATION POSTS MIN. SIZE 4" SQUARE OR 5" ROUND. SET AT LEAST 3' INTO THE GROUND. PLATE. 3.14-6 BASIN #1 ELEVATION (FT) 636.46 A IFICATIONS SB #1 "'AIIIN OU LOW E- 30" Q25 = 36.35 cfs 63,644 69,656 75,178 APRON LENGTH = 23' (LL =T PROTECTION SEE DETAIL) . LEDBETTER o. 1507-B suft�E�0J 01 REVISIONS COUNTY COMMENTS Murch 15, 2016 COUNTY COMMENTS May 13, 2016 COUNTY COMMENTS May 23, 2016 AMENDMENT August 11, 2016 GATE Jan. 25, 2016 SCALE 1"=20' �I FILE NUMBER 3053 SHEET I 6 of 9 • LL, LLJ .d Q(5 •• 4 00 11.0 i .. s = r� Z 0 Uj IL Uj J �I FILE NUMBER 3053 SHEET I 6 of 9 0. 665 •1 655 650 645 640 635 6EDIMENT BASIN #2 (BMP S-3) SEDIMENT BASIN S CHEMA TI C ELE VA TIONS CREST OF EMERGENCY e SPILLWAY DESIGN HIGH WATER (25 -YR. STORM ELEV.) MIN. 1.0' SEDIMENT CLEANOUT POINT DESIGN ELEVATIONS WITH EMERGENCY SPILLWAY SOURCE: VA. DSWC PLATE. 3.14-2 CONNECTIONS BETWEEN THE ANTI -SEEP AND THE BARREL MUST BE WATERTIGHT SOURCE: VA. DSWC DAM CONSTRUCTION NOTES: 1. GEOTECHNICAL_ CONSULTANT TO SPECIFY DAM EMBANKMENT MATERIAL, SEEPAGE CONTROL DEVICES, CUT-OFF TRENCH DESIGN, CULVERT BEDDING REQUIREMENTS, AND OTHER APPROPRIATE GEOTECHNICAL DESIGN REQUIREMENTS. 2. FOUNDATION AND ABUTMENT AREA EXTENDING 10' BEYOND DAM FOOTPRINT SHALL BE CLEARED, GRUBBED AND STRIPPED OF ALL VEGETATION TOPSOIL AND/OR ORGANIC SOIL AND OTHER UNSUITABLE MATERIALS. 3. AFTER CLEARING, GRUBBING, STRIPPING, AND REMOVING ANY OTHER UNSUITABLE MATERIALS, THE SUBGRADE SHALL BE PROOF -ROLLED WITH COMPACTION EQUIPMENT UNDER THE OBSERVATION OF A QUALIFIED ENGINEER. THE COMPACTION EQUIPMENT SHALL CONSIST OF THE HEAVIEST POSSIBLE EQUIPMENT THAT WILL NOT CAUSE DISTURBANCE OF SUITABLE SUBGRADE SOILS. EXCESSIVELY SOFT OR UNSUITABLE MATERIALS SHALL BE REMOVED AND REPLACED WITH COMPACTED FILL. WHERE ROCK IS EXPOSED AFTER STRIPPING OR UNDERCUTTING, ALL LOOSE ROCK MATERIAL SHALL BE REMOVED PRIOR TO PLACING COMPACTED FILL. ROCK SUBGRADES SHALL BE INSPECTED AND APPROVED BY INSPECTOR OR ENGINEER PRIOR TO PLACEMENT OF FILL. 4. COMPACTED FILL SHALL NOT BE PLACED PRIOR TO PERFORMING THE REQUIRED FOUNDATION AND ABUTMENT PREPARATION, OR ON ANY FROZEN SURFACE. COMPACTED FILL SHALL EXTEND TO THE FILL LIMIT LINES AND GRADES INDICATED ON THE APPROVED CONSTRUCTION PLAN. COMPACTED FILL MATERIAL SHALL BE OF THE TYPE CLASSIFICATION SYMBOL SPECIFIED BY THE GEOTECHNICAL CONSULTANT, OR OF A BETTER QUALITY MATERIAL AS DEFINED BY THE UNIFIED SOIL CLASSIFICATION SYSTEM (USCS). RESTRICTIONS ON LIQUID LIMIT AND PLASTICITY INDEX OF MATERIAL MAY BE INCLUDED WHERE APPLICABLE. COMPACTED FILL SHALL CONSIST OF MATERIAL FREE OF ORGANIC MATTER, RUBBISH, FROZEN SOIL, SNOW, ICE, AND PARTICLES WITH SIZES LARGER THAN 3" OR ANY OTHER DELETERIOUS MATERIAL. 5. COMPACTED FILL SHALL BE PLACED IN HORIZONTAL LAYER OF 8"-12" IN LOOSE THICKNESS. ACTUAL LIFT THICKNESS SHALL BE SPECIFIED BY THE GEOTECHNICAL CONSULTANT. THE MOISTURE CONTENT SHALL BE CONTROLLED SUCH THAT COMPACTION IS ACHIEVED WITHOUT YEILDING OF THE SURFACE. EACH LAYER SHALL BE UNIFORMLY COMPACTED WITH SUITABLE COMPACTION EQUIPMENT TO AT LEAST 95% OF STANDARD PROCTOR MAXIMUM DENSITY IN ACCORDANCE WITH ASTM D-698, AASHTO T-99, OR VDOT SPECIFICATIONS. ANY LAYER OF FINE GRAINED FILL WHICH BECOMES SMOOTH SHALL BE SACRIFICED TO A DEPTH OF 2" TO ALLOW ADEQUATE BONDING BETWEEN LAYERS. 6. COMPACTED FILL WITH A MOISTURE CONTENT WHICH WILL NOT PERMIT COMPACTION TO THE SPECIFIES DENSITY STANDARD SHALL BE SACRIFICED, DRIED, OR WETTED AS NECESSARY TO PERMIT PROPER COMPACTION. [L 000 0 00 O 00 co OCD 0)O� 00) LOLn Wet Storage - �o LO �o MIN BERM Qo CO Ln0 Qo c0 rD c0 c,D cD CD c0 CD 0 10+00 +50 11+00 +50 12+00 +50 655 WIDTH -8.0' TWO HALF SECTIONS CONSTRUCTION AND CONSTRUCTION MATERIAL AND BETWEEN THE PIPE AND CONNECTING BAND SPECIFICATIONS. SHALL BE CAULKED WITH ASPHALT MASTIC AT 2. WHEN SPECIFIED ON THE PLANS, COATING OF TIME OF INSTALLATION. COLLARS SHALL BE IN ACCORDANCE WITH 5. EACH COLLAR SHALL BE FURNISHED WITH TWO T P OFD M EMERG NCY SPILLWAY AM o 04 C4 Z ! EL V.= 65-17.20 UJ ELE-V.-656.20 Cq ` '' (25-Y . STOR ELEV.) ELEV.=6 6.07 LO �- !! IL W UJ Cc ft • Z0 #► 0 ,�, , LU 17.8 CL I RIPRAP 48" RCP ISER_ 18' .Y. MIN. DEPTH - - - W/UNDERLY( G F.F - SEE DE AIL) S� O� CREST ELEV.=6 4.76(A B) S� BOTTOM BASIN E EV=650.00 56.0 LF OF '_-136" RCP @ 1.547 M Cn PRIOPOSED GRADE 00 C5 In a� 1 -14 - EXISTING GRADE rn II 11 z z Horizontal Scale = 1 :20 Vertical Sccale = 1 :5 z z SEDIMENT BASIN S CHEMA TI C ELE VA TIONS CREST OF EMERGENCY e SPILLWAY DESIGN HIGH WATER (25 -YR. STORM ELEV.) MIN. 1.0' SEDIMENT CLEANOUT POINT DESIGN ELEVATIONS WITH EMERGENCY SPILLWAY SOURCE: VA. DSWC PLATE. 3.14-2 CONNECTIONS BETWEEN THE ANTI -SEEP AND THE BARREL MUST BE WATERTIGHT SOURCE: VA. DSWC DAM CONSTRUCTION NOTES: 1. GEOTECHNICAL_ CONSULTANT TO SPECIFY DAM EMBANKMENT MATERIAL, SEEPAGE CONTROL DEVICES, CUT-OFF TRENCH DESIGN, CULVERT BEDDING REQUIREMENTS, AND OTHER APPROPRIATE GEOTECHNICAL DESIGN REQUIREMENTS. 2. FOUNDATION AND ABUTMENT AREA EXTENDING 10' BEYOND DAM FOOTPRINT SHALL BE CLEARED, GRUBBED AND STRIPPED OF ALL VEGETATION TOPSOIL AND/OR ORGANIC SOIL AND OTHER UNSUITABLE MATERIALS. 3. AFTER CLEARING, GRUBBING, STRIPPING, AND REMOVING ANY OTHER UNSUITABLE MATERIALS, THE SUBGRADE SHALL BE PROOF -ROLLED WITH COMPACTION EQUIPMENT UNDER THE OBSERVATION OF A QUALIFIED ENGINEER. THE COMPACTION EQUIPMENT SHALL CONSIST OF THE HEAVIEST POSSIBLE EQUIPMENT THAT WILL NOT CAUSE DISTURBANCE OF SUITABLE SUBGRADE SOILS. EXCESSIVELY SOFT OR UNSUITABLE MATERIALS SHALL BE REMOVED AND REPLACED WITH COMPACTED FILL. WHERE ROCK IS EXPOSED AFTER STRIPPING OR UNDERCUTTING, ALL LOOSE ROCK MATERIAL SHALL BE REMOVED PRIOR TO PLACING COMPACTED FILL. ROCK SUBGRADES SHALL BE INSPECTED AND APPROVED BY INSPECTOR OR ENGINEER PRIOR TO PLACEMENT OF FILL. 4. COMPACTED FILL SHALL NOT BE PLACED PRIOR TO PERFORMING THE REQUIRED FOUNDATION AND ABUTMENT PREPARATION, OR ON ANY FROZEN SURFACE. COMPACTED FILL SHALL EXTEND TO THE FILL LIMIT LINES AND GRADES INDICATED ON THE APPROVED CONSTRUCTION PLAN. COMPACTED FILL MATERIAL SHALL BE OF THE TYPE CLASSIFICATION SYMBOL SPECIFIED BY THE GEOTECHNICAL CONSULTANT, OR OF A BETTER QUALITY MATERIAL AS DEFINED BY THE UNIFIED SOIL CLASSIFICATION SYSTEM (USCS). RESTRICTIONS ON LIQUID LIMIT AND PLASTICITY INDEX OF MATERIAL MAY BE INCLUDED WHERE APPLICABLE. COMPACTED FILL SHALL CONSIST OF MATERIAL FREE OF ORGANIC MATTER, RUBBISH, FROZEN SOIL, SNOW, ICE, AND PARTICLES WITH SIZES LARGER THAN 3" OR ANY OTHER DELETERIOUS MATERIAL. 5. COMPACTED FILL SHALL BE PLACED IN HORIZONTAL LAYER OF 8"-12" IN LOOSE THICKNESS. ACTUAL LIFT THICKNESS SHALL BE SPECIFIED BY THE GEOTECHNICAL CONSULTANT. THE MOISTURE CONTENT SHALL BE CONTROLLED SUCH THAT COMPACTION IS ACHIEVED WITHOUT YEILDING OF THE SURFACE. EACH LAYER SHALL BE UNIFORMLY COMPACTED WITH SUITABLE COMPACTION EQUIPMENT TO AT LEAST 95% OF STANDARD PROCTOR MAXIMUM DENSITY IN ACCORDANCE WITH ASTM D-698, AASHTO T-99, OR VDOT SPECIFICATIONS. ANY LAYER OF FINE GRAINED FILL WHICH BECOMES SMOOTH SHALL BE SACRIFICED TO A DEPTH OF 2" TO ALLOW ADEQUATE BONDING BETWEEN LAYERS. 6. COMPACTED FILL WITH A MOISTURE CONTENT WHICH WILL NOT PERMIT COMPACTION TO THE SPECIFIES DENSITY STANDARD SHALL BE SACRIFICED, DRIED, OR WETTED AS NECESSARY TO PERMIT PROPER COMPACTION. [L 000 0 00 O 00 co OCD 0)O� 00) LOLn Wet Storage - �o LO �o �n LO") Qo CO Ln0 Qo c0 rD c0 c,D cD CD c0 CD 0 10+00 +50 11+00 +50 12+00 +50 SEDIMENT BASIN S CHEMA TI C ELE VA TIONS CREST OF EMERGENCY e SPILLWAY DESIGN HIGH WATER (25 -YR. STORM ELEV.) MIN. 1.0' SEDIMENT CLEANOUT POINT DESIGN ELEVATIONS WITH EMERGENCY SPILLWAY SOURCE: VA. DSWC PLATE. 3.14-2 CONNECTIONS BETWEEN THE ANTI -SEEP AND THE BARREL MUST BE WATERTIGHT SOURCE: VA. DSWC DAM CONSTRUCTION NOTES: 1. GEOTECHNICAL_ CONSULTANT TO SPECIFY DAM EMBANKMENT MATERIAL, SEEPAGE CONTROL DEVICES, CUT-OFF TRENCH DESIGN, CULVERT BEDDING REQUIREMENTS, AND OTHER APPROPRIATE GEOTECHNICAL DESIGN REQUIREMENTS. 2. FOUNDATION AND ABUTMENT AREA EXTENDING 10' BEYOND DAM FOOTPRINT SHALL BE CLEARED, GRUBBED AND STRIPPED OF ALL VEGETATION TOPSOIL AND/OR ORGANIC SOIL AND OTHER UNSUITABLE MATERIALS. 3. AFTER CLEARING, GRUBBING, STRIPPING, AND REMOVING ANY OTHER UNSUITABLE MATERIALS, THE SUBGRADE SHALL BE PROOF -ROLLED WITH COMPACTION EQUIPMENT UNDER THE OBSERVATION OF A QUALIFIED ENGINEER. THE COMPACTION EQUIPMENT SHALL CONSIST OF THE HEAVIEST POSSIBLE EQUIPMENT THAT WILL NOT CAUSE DISTURBANCE OF SUITABLE SUBGRADE SOILS. EXCESSIVELY SOFT OR UNSUITABLE MATERIALS SHALL BE REMOVED AND REPLACED WITH COMPACTED FILL. WHERE ROCK IS EXPOSED AFTER STRIPPING OR UNDERCUTTING, ALL LOOSE ROCK MATERIAL SHALL BE REMOVED PRIOR TO PLACING COMPACTED FILL. ROCK SUBGRADES SHALL BE INSPECTED AND APPROVED BY INSPECTOR OR ENGINEER PRIOR TO PLACEMENT OF FILL. 4. COMPACTED FILL SHALL NOT BE PLACED PRIOR TO PERFORMING THE REQUIRED FOUNDATION AND ABUTMENT PREPARATION, OR ON ANY FROZEN SURFACE. COMPACTED FILL SHALL EXTEND TO THE FILL LIMIT LINES AND GRADES INDICATED ON THE APPROVED CONSTRUCTION PLAN. COMPACTED FILL MATERIAL SHALL BE OF THE TYPE CLASSIFICATION SYMBOL SPECIFIED BY THE GEOTECHNICAL CONSULTANT, OR OF A BETTER QUALITY MATERIAL AS DEFINED BY THE UNIFIED SOIL CLASSIFICATION SYSTEM (USCS). RESTRICTIONS ON LIQUID LIMIT AND PLASTICITY INDEX OF MATERIAL MAY BE INCLUDED WHERE APPLICABLE. COMPACTED FILL SHALL CONSIST OF MATERIAL FREE OF ORGANIC MATTER, RUBBISH, FROZEN SOIL, SNOW, ICE, AND PARTICLES WITH SIZES LARGER THAN 3" OR ANY OTHER DELETERIOUS MATERIAL. 5. COMPACTED FILL SHALL BE PLACED IN HORIZONTAL LAYER OF 8"-12" IN LOOSE THICKNESS. ACTUAL LIFT THICKNESS SHALL BE SPECIFIED BY THE GEOTECHNICAL CONSULTANT. THE MOISTURE CONTENT SHALL BE CONTROLLED SUCH THAT COMPACTION IS ACHIEVED WITHOUT YEILDING OF THE SURFACE. EACH LAYER SHALL BE UNIFORMLY COMPACTED WITH SUITABLE COMPACTION EQUIPMENT TO AT LEAST 95% OF STANDARD PROCTOR MAXIMUM DENSITY IN ACCORDANCE WITH ASTM D-698, AASHTO T-99, OR VDOT SPECIFICATIONS. ANY LAYER OF FINE GRAINED FILL WHICH BECOMES SMOOTH SHALL BE SACRIFICED TO A DEPTH OF 2" TO ALLOW ADEQUATE BONDING BETWEEN LAYERS. 6. COMPACTED FILL WITH A MOISTURE CONTENT WHICH WILL NOT PERMIT COMPACTION TO THE SPECIFIES DENSITY STANDARD SHALL BE SACRIFICED, DRIED, OR WETTED AS NECESSARY TO PERMIT PROPER COMPACTION. [L Basin Design Elevations: Top of Dam - 657.20 Design High Water - 656.07 (25 -Year Storm) 650 Crest of Riser = 654.76 Toe of Dam = 650.00 Principal Spillway Design: 645 Riser Dia. = 48" Trash Rack Dia. = 72" Trash Rack Ht. = 21" Barrel Length - 56.0' Barrel Dia. = 36" 640 Inv. Out 36" Barrel = 649.97 635 13+00 SCALE 1" = 20' 20 10 0 20 40 SCALE IN FEET ANTI -SEEP COLLAR SATURATED ZONE PLATE. 3.14-4 Emergency Spillway Design: Spillway Elev. = 656.20 1992 3.14 1/2" X 2" SLOTTED SEDIMENT BASIN #2 12" MIN. Total Drainage Area= 8.50 acres BOLTS Basin Design Volumes: 665 Wet Storage - 04 Minimum Volume Req'd. = 67 cy * 8.50 acres = 570 cy CL Available Basin Volume Prov'd. = 598 cy @ 652.00 SLOTTED HOLES p CONTINUOUS WELD AT 8" G.G. SECTION B - Depth to Cleanout Elev. = 1.00 ft 660 Dry Storage - Minimum Volume Req'd. = 67 cy * 8.50 acres = 570 cy .. Available Basin Volume Prov'd. = 2,068 cy @ 655.47 3. Dewatering Orifice Invert = 652.00 SHALL BE MARKED BY Cleanout Elev. - 651.00 655 1. ALL MATERIALS TO BE IN ACCORDANCE WITH 4. Basin Design Elevations: Top of Dam - 657.20 Design High Water - 656.07 (25 -Year Storm) 650 Crest of Riser = 654.76 Toe of Dam = 650.00 Principal Spillway Design: 645 Riser Dia. = 48" Trash Rack Dia. = 72" Trash Rack Ht. = 21" Barrel Length - 56.0' Barrel Dia. = 36" 640 Inv. Out 36" Barrel = 649.97 635 13+00 SCALE 1" = 20' 20 10 0 20 40 SCALE IN FEET ANTI -SEEP COLLAR SATURATED ZONE PLATE. 3.14-4 Emergency Spillway Design: Spillway Elev. = 656.20 1992 3.14 1/2" X 2" SLOTTED HOLES FOR 12" MIN. 3/8" DIAMETER BOLTS I21 0 �B o n o -I- o o 2" 04 BAND CL WELD BOTH SIDES SLOTTED HOLES p CONTINUOUS WELD AT 8" G.G. SECTION B - p CORRUGATED METAL D t CSHEET WELDED TO ENTER OF BAND B ELEVATION OF UNASSEMBLED COLLAR .. 3. UNASSEMBLED COLLARS SHALL BE MARKED BY NOTES FOR COLLARS: PAINTING OR TAGGING TO IDENTIFY MATCHING PAIRS. 1. ALL MATERIALS TO BE IN ACCORDANCE WITH 4. THE LAP BETWEEN THE TWO HALF SECTIONS CONSTRUCTION AND CONSTRUCTION MATERIAL AND BETWEEN THE PIPE AND CONNECTING BAND SPECIFICATIONS. SHALL BE CAULKED WITH ASPHALT MASTIC AT 2. WHEN SPECIFIED ON THE PLANS, COATING OF TIME OF INSTALLATION. COLLARS SHALL BE IN ACCORDANCE WITH 5. EACH COLLAR SHALL BE FURNISHED WITH TWO CONSTRUCTION AND CONSTRUCTION MATERIAL 1/2" DIAMETER RODS WITH STANDARD TANK SPECIFICATIONS. LUGS FOR CONNECTING COLLARS TO PIPE. �E'TAIL OF I4IVLICAL PIPE' ANTI -SEEP COLLAR SIZE AND SPACING OF SLOTTED OPENINGS SHALL BE THE SAME AS SHOWN FOR CM COLLAR. USE RODS AND LUGS TO CLAMP (BANDS SECURELY TO PIPE. 12" MIN. 1 2" BAND HELICCALFPIPE WELD 1 1 /8" X 1 1 /8" X 1 1 /8' ANGLES TO COLLAR OR BEND A 90 ANGLE 1 1/8" WIDE AS SHOWN IN DRAWING. 1 1/8" NOTE FOR BANDS AND COLLARS: MODIFICATIONS OF THE DETAILS I( SHOWN MAY BE USED PROVIDING EQUAL WATERTIGHTNESS IS a MAINTAINED AND DETAILED DRAWINGS ARE SUBMITTED AND APPROVED BY THE ENGINEER PRIOR \ \ TO DELIVERY. ISOMETRIC VIEW SHEET METAL COLLAR SHALL BE CUT TO FIT CORRUGATIONS OF HELICAL BAND, AND ROD AND LUG WELDED WITH A CONTINUOUS WELD. NOTE: FOR DETAILS OF FABRICATION DIMENSIONS, MINIMUM GAGES, SLOTTED HOLES, AND NOTES, SEE DETAIL ABOVE. METAL COLLAR 70 BE WELDED TO CENTER OF NOTE: TWO OTHER TYPES OF ANTI -SEEP COLLARS ARE: HELICAL PIPE BAND 1. CORRUGATED METAL, SIMILAR TO UPPER, EXCEPT SHOP WELDED TO A SHORT (4FT.) SECTION OF THE PIPE AND CONNECTED WITH CONNECTING BANDS TO THE PIPE. (PARTIAL ELEVATION 2. CONCRETE, SIX INCHES THICK FORMED AROUND THE PIPE REF: ENGR. FIELD MANUAL WITH #3 REBAR SPACED 15" HORIZONTALLY AND VERTICALLY. SOURCE: USDA -SCS EVENT EXCAVATED INTO SUITABLE MATERIAL 4' MIN EVENTS FOR SEDIMENT BASIN '#2 INFLOW (CFS) PRIMARY(CFS) ELEVATION (FTS 24.00 0.69 655.31 42.52 12.45 655.70 55.38 31.21 656.07 PLATE. 3.14-13 STORAGE (CUBIC FT) 53,740 58,700 63,750 OUTLET PROTECTION SPECIFICATIONS 1SB OUTFLOW (O!P 2 A ,=� 17.8 C.Y. CL I`RIPRAP » N i, !.,,18" MIN. DEPTH ~ �, F-36 W}/UNDERLYING F..F "� Q10 = 12.45 cfs APRON LENGTH = 20' rJ.LEDBETTER jAOUTLET PROTECTION(SEE DETAIL)"yTTERi REVISIONS COUNTY COMMENTS March 15, 2016 COUNTY COMMENTS May 13, 2016 COUNTY COMMENTS May 23, 2016 AMENDMENT August 11, 2016 i DATE ,Jtan. 25, 2016 SCALE 1"=20' • 04 CL M ' • .. �i CL go f W - +�! s Q 4 AM o 04 C4 Z ! -• UJ •� Cq ` '' 0 LL LO !! IL W UJ Cc ft • Z0 #► 0 ,�, , LU REVISIONS COUNTY COMMENTS March 15, 2016 COUNTY COMMENTS May 13, 2016 COUNTY COMMENTS May 23, 2016 AMENDMENT August 11, 2016 i DATE ,Jtan. 25, 2016 SCALE 1"=20' FILE NUMBER 8053 i SHEET 7 Of 0 � 04 CL ' 0 �i CO M C0 Z ! -• !! • Z0 LU UJI FILE NUMBER 8053 i SHEET 7 Of 0 Co. 0 655 .0 645 - 635 .e] 625 :M 615 610 SEDIMENT BASIN #3 (BMP 5-12) O N O 011'? Mtn O c00 0 0 7 O00 Lo(DLo L0Ln d- N �t Y 00 C14 rid- 40 11) U') N 1`0 V) CO c0 CD CO c0 cD cD (0 c0 c0 -- c0 co 10+00 +50 11+00 +50 12+00 +50 13+00 +50 MIN BERM • f Cr • s �.. a CL Z WIDTH 8.0' • Uj -�... r 02 • ." fUjit Iti TOP OF DAM ,. s= 0 ~ 11 ELEV. 650.2 co • LLJ �•Uj 1 Cc • EIVERGENCY SPILLWAY 0i • , -_(25-YR. STORM ELEV.) ELEV. = 48.07 _ 48" RCF RISER ---m- �IT A� W 7.2 AN I--VORT X (SE-& DETAIL) CREST EL .647.20 BOTT M BASIN ELEV 40.00 18.9.Y. CL I RIPRAP 7 Oo 18' MIN. DEPTH LF \W/U\IDERLYING F.F 0 % D PROPOSED GRADE - - - - EXISTING GRADE 0 o L? Horizontal Scale = 1 :20 O 07 Vertical Scale = 1 :5 6 N Q0 II I I z � 0 z z O N O 011'? Mtn O c00 0 0 7 O00 Lo(DLo L0Ln d- N �t Y 00 C14 rid- 40 11) U') N 1`0 V) CO c0 CD CO c0 cD cD (0 c0 c0 c0 c0 c0 co 10+00 +50 11+00 +50 12+00 +50 13+00 +50 DAM CONSTRUCTION NOTES: 1. GEOTECHNICAL CONSULTANT TO SPECIFY DAM EMBANKMENT MATERIAL, SEEPAGE CONTROL DEVICES, CUT-OFF TRENCH DESIGN, CULVERT BEDDING REQUIREMENTS, AND OTHER APPROPRIATE GEOTECHNICAL DESIGN REQUIREMENTS. 2. FOUNDATION AND ABUTMENT AREA EXTENDING 10' BEYOND DAM FOOTPRINT SHALL BE CLEARED, GRUBBED AND STRIPPED OF ALL VEGETATION TOPSOIL AND/OR ORGANIC SOIL AND OTHER UNSUITABLE MATERIALS. 3. AFTER CLEARING, GRUBBING, STRIPPING, AND REMOVING ANY OTHER UNSUITABLE MATERIALS, THE SUBGRADE SHALL BE PROOF -ROLLED WITH COMPACTION EQUIPMENT UNDER THE OBSERVATION OF A QUALIFIED ENGINEER. THE COMPACTION EQUIPMENT SHALL CONSIST OF THE HEAVIEST POSSIBLE EQUIPMENT THAT WILL NOT CAUSE DISTURBANCE OF SUITABLE SUBGRADE SOILS. EXCESSIVELY SOFT OR UNSUITABLE MATERIALS SHALL BE REMOVED AND REPLACED WITH COMPACTED FILL. WHERE ROCK IS EXPOSED AFTER STRIPPING OR UNDERCUTTING, ALL LOOSE ROCK MATERIAL SHALL BE REMOVED PRIOR TO PLACING COMPACTED FILL. ROCK SUBGRADES SHALL BE INSPECTED AND APPROVED BY INSPECTOR OR ENGINEER PRIOR TO PLACEMENT OF FILL. 4. COMPACTED FILL SHALL NOT BE PLACED PRIOR TO PERFORMING THE REQUIRED FOUNDATION AND ABUTMENT PREPARATION, OR ON ANY FROZEN SURFACE. COMPACTED FILL SHALL EXTEND TO THE FILL LIMIT LINES AND GRADES INDICATED ON THE APPROVED CONSTRUCTION PLAN. COMPACTED FILL MATERIAL SHALL BE OF THE TYPE CLASSIFICATION SYMBOL SPECIFIED BY THE GEOTECHNICAL CONSULTANT, OR OF A BETTER QUALITY MATERIAL AS DEFINED BY THE UNIFIED SOIL CLASSIFICATION SYSTEM (USCS). RESTRICTIONS ON LIQUID LIMIT AND PLASTICITY INDEX OF MATERIAL MAY BE INCLUDED WHERE APPLICABLE. COMPACTED FILL SHALL CONSIST OF MATERIAL FREE OF ORGANIC MATTER, RUBBISH, FROZEN SOIL, SNOW, ICE, AND PARTICLES WITH SIZES LARGER THAN 3" OR ANY OTHER DELETERIOUS MATERIAL. 5. COMPACTED FILL SHALL BE PLACED IN HORIZONTAL LAYER OF 8"-12" IN LOOSE THICKNESS. ACTUAL LIFT THICKNESS SHALL BE SPECIFIED BY THE GEOTECHNICAL CONSULTANT. THE MOISTURE CONTENT SHALL BE CONTROLLED SUCH THAT COMPACTION IS ACHIEVED WITHOUT YEILDING OF THE SURFACE, EACH LAYER SHALL BE UNIFORMLY COMPACTED WITH SUITABLE COMPACTION EQUIPMENT TO AT LEAST 95% OF STANDARD PROCTOR MAXIMUM DENSITY IN ACCORDANCE WITH ASTM D-698, AASHTO T-99, OR VDOT SPECIFICATIONS. ANY LAYER OF FINE GRAINED FILL WHICH BECOMES SMOOTH SHALL BE SACRIFICED TO A DEPTH OF 2" TO ALLOW ADEQUATE BONDING BETWEEN LAYERS. 6. COMPACTED FILL WITH A MOISTURE CONTENT WHICH WILL NOT PERMIT COMPACTION TO THE SPECIFIES DENSITY STANDARD SHALL BE SACRIFICED, DRIED, OR WETTED AS NECESSARY TO PERMIT PROPER COMPACTION. SCALE I" = 20' 20 10 0 20 40 SCALE IN FEET Basin Design Elevations: Top of Dam = 650.20 650 Design High Water - 648.07 (25 -Year Storm) Crest of Riser = 647.20 Toe of Dam - 640.00 Principal Spillway Design` 645 Riser Dia. = 48" Trash Rack Dia. = 72" Trash Rack Ht. = 21" Barrel Length = 100.0' 640 Barrel Dia. - 24" Inv. Out 24" Barrel = 629.50 635 630 625 620 615 610 Emergency Spillway Design: Spillway Elev. = 648.50 SEDIMENT BA SIN S CHEMA TI C ELE VA TIONS CREST OF EMERGENCY SPILLWAY DESIGN HIGH WATER (25 -YR. STORM ELEV.) MIN. 1.0' 0.5' MIN. 1.0' RISER CREST 67 C.Y./ AC. DRY " STORAGE DEWATERING DEVICE 67 C.Y./ AC. WET STORAGE .... i8?iv Ht...... . ?ot'... :'..u..i3i'i$33;R(;%ii3iJ`'`.'.. �5:,�??&S`dtitz tE SEDIMENT CLEANOUT POINT DESIGN ELEVATIONS WITH EMERGENCY SPILLWAY SOURCE: VA. DSWC PLATE. 3.14-2 SAF) SAFETY FENCE PERSPECTIVE VIEW PERSPECTIVE VIEW PLASTIC FENCE SOURCE: CONWED PLASTICS VDOT ROAD AND BRIDGE STANDARDS VA. DSWC EVENT EXCAVATED INTO SUITABLE MATERIAL 4' MIN 478-0011 MOM NEI - 1111 1:.1 ii III 10' MAX. u. ill CONCRETE BRACING FOOTING l u; U, N1RE FABRIC UNE POST GROUND UNE PERSPECTIVE VIEW METAL FENCE EVENTS FOR SEDIMENT BASIN #3 INFLOW (CFS) PRIMARY (CFS) ELEVATION (FT) 28.23 2.72 647.355 50.03 31.67 648.03 65.15 51.11 648.34 PLATE. 3.1-1 STORAGE CUBIC FT) 46,970 54,900 59,775 OUTLET PROTECTION SPECIFICATIONS r l Y } OUTFLOW - 18.9 .Y. CL` I RIPRAP OP3A N I.,_ 18 MIN. DEPTH 24' )W/UNDERLYING F.FQ = 31.67 cfs C Y Y 1 i i I ! 1. J. _ 10 APRON LENGTH = 22' �1,ALTH DF �j� OUTLET PROTECTION U }> ('SEE DETAIL) WILLIAM J. LEDBETTER Lic. No. 1507-B (q /V0 SURVE_(0 h C SEDIMENT BASIN #3 Total Drainage Area- 10.0 acres 665 Basin Design Volumes: U) Wet Storage - Minimum Volume Req'd. = 67 cy * 10.0 acres -= 670 cy Available Basin Volume Prov'd. - 705 cy @ 644.42 C Depth to Cleanout Elev. = 1.60 ft 660 Dry Storage - Minimum Volume Req'd. = 67 cy * 10.0 acres = 670 cy Available Basin Volume Prov'd. = 1,368 cy @ 646.47 06 Dewatering Orifice Invert = 644.42 655 Cleanout Elev. = 642.82 Basin Design Elevations: Top of Dam = 650.20 650 Design High Water - 648.07 (25 -Year Storm) Crest of Riser = 647.20 Toe of Dam - 640.00 Principal Spillway Design` 645 Riser Dia. = 48" Trash Rack Dia. = 72" Trash Rack Ht. = 21" Barrel Length = 100.0' 640 Barrel Dia. - 24" Inv. Out 24" Barrel = 629.50 635 630 625 620 615 610 Emergency Spillway Design: Spillway Elev. = 648.50 SEDIMENT BA SIN S CHEMA TI C ELE VA TIONS CREST OF EMERGENCY SPILLWAY DESIGN HIGH WATER (25 -YR. STORM ELEV.) MIN. 1.0' 0.5' MIN. 1.0' RISER CREST 67 C.Y./ AC. DRY " STORAGE DEWATERING DEVICE 67 C.Y./ AC. WET STORAGE .... i8?iv Ht...... . ?ot'... :'..u..i3i'i$33;R(;%ii3iJ`'`.'.. �5:,�??&S`dtitz tE SEDIMENT CLEANOUT POINT DESIGN ELEVATIONS WITH EMERGENCY SPILLWAY SOURCE: VA. DSWC PLATE. 3.14-2 SAF) SAFETY FENCE PERSPECTIVE VIEW PERSPECTIVE VIEW PLASTIC FENCE SOURCE: CONWED PLASTICS VDOT ROAD AND BRIDGE STANDARDS VA. DSWC EVENT EXCAVATED INTO SUITABLE MATERIAL 4' MIN 478-0011 MOM NEI - 1111 1:.1 ii III 10' MAX. u. ill CONCRETE BRACING FOOTING l u; U, N1RE FABRIC UNE POST GROUND UNE PERSPECTIVE VIEW METAL FENCE EVENTS FOR SEDIMENT BASIN #3 INFLOW (CFS) PRIMARY (CFS) ELEVATION (FT) 28.23 2.72 647.355 50.03 31.67 648.03 65.15 51.11 648.34 PLATE. 3.1-1 STORAGE CUBIC FT) 46,970 54,900 59,775 OUTLET PROTECTION SPECIFICATIONS r l Y } OUTFLOW - 18.9 .Y. CL` I RIPRAP OP3A N I.,_ 18 MIN. DEPTH 24' )W/UNDERLYING F.FQ = 31.67 cfs C Y Y 1 i i I ! 1. J. _ 10 APRON LENGTH = 22' �1,ALTH DF �j� OUTLET PROTECTION U }> ('SEE DETAIL) WILLIAM J. LEDBETTER Lic. No. 1507-B (q /V0 SURVE_(0 h C REVISIONS COUNTY COMMENTSI March 15, 2016 j COUNTY COMMENTS May 13, 2016 COUNTY COMMENTS May 23, 2016 AMENDMENT August 11, 2016 DATE Jan. 25, 2016 SCALE 1 ° = 20' CO CL1 U) <�*11 0 C 0 'cq r•• 06 to ,. CM 100 • 0 Z .6 • f Cr • s R a CL Z • Uj • r 02 • ." fUjit Iti jr ,. s= 0 UJ 11 co • LLJ �•Uj 1 Cc • 0i • , REVISIONS COUNTY COMMENTSI March 15, 2016 j COUNTY COMMENTS May 13, 2016 COUNTY COMMENTS May 23, 2016 AMENDMENT August 11, 2016 DATE Jan. 25, 2016 SCALE 1 ° = 20' FILE NUMBER 6053 SHEET 8Of9 CO CL1 C 0 LU W 06 Z 100 • 0 .6 R a (L �. • 02 ." fUjit jr ,. Z 0 0 UJ 11 LLJ FILE NUMBER 6053 SHEET 8Of9 REVISIONS COUNTY COMMENTS Murch 15, 2016 COUNTY COMMENTS May 13, 2015 COUNTY COMMENTS May 23, 2015 AMENDMENT August 11, 2015 ATE pian. 25, 2015 TEMPORARY VEGETATION OR TO HAVE SILT FENCE INSTALLED ALONG THE LOWER HIGH FLOWS AROUND THE EDGES OF THE DAM SHOULD BE CORRECTED IMMEDIATELY. EROSION AND SEDIMENT CONTROL NARRATIVE PERIMETER TO PROTECT DOWNSTREAM AREAS. a Lli 7. THE EARTHEN EMBANKMENTS SHALL BE CHECKED REGULARLY TO ENSURE THAT IT IS PRIOR TO CONSTRUCTION 3. TEMPORARY SEEDING (3.31) - AREAS NOT BROUGHT TO FINAL GRADE FOR A PERIOD OF STRUCTURALLY SOUND AND HAS NOT BEEN DAMAGED BY EROSION OR CONSTRUCTION 1. OWNER SHALL POST SURETY BONDS FOR CONSTRUCTION, EROSION & SEDIMENT CONTROL. MORE THAN 14 DAYS SHALL BE STABILIZED WITH A TEMPORARY SEED MIXTURE EQUIPMENT. f 2. CONTRACTOR SHALL OBTAIN PERMITS TO WORK WITHIN STATE RIGHT-OF-WAY (VDOT ACCEPTABLE FOR THAT TIME OF YEAR. CRIMPING, PUNCH ROLLER -TYPE ROLLERS, OR > z ED � LAND -USE PERMIT). BONDING FOR WORK WITHIN THE VDOT RIGHT-OF-WAY MAY BE TRACK WALKING MAY BE USED TO INCORPORATE STRAW MULCH INTO THE SOIL ON 8. THE STORMWATER MANAGEMENT FACILITIES SHOULD BE CHECKED REGULARLY BY THE j (1) REQUIRED TO OBTAIN THE PERMIT. SLOPES IF STRAW IS TO BE USED. HOMEOWNERS ASSOCIATIONS TO ENSURE THAT THEY ARE STRUCTURALLY SOUND AND '' • f 3. CONTRACTOR SHALL COORDINATE WITH OWNER TO OBTAIN VSMP PERMITS, AS REQUIRED HAVE NOT BEEN DAMAGED BY EROSION. BY THE STATE DEPARTMENT OF ENVIRONMENTAL QUALITY (DEQ). 4. PERMANENT SEEDING (3.32) - AREAS BROUGHT TO FINAL GRADE OR THOSE Cr. 4. CONTRACTOR SHALL OBTAIN LAND DISTURBANCE PERMIT FROM THE COUNTY OF CONSTRUCTION AREAS THAT WILL REMAIN DORMANT FOR YEAR OR MORE SHALL BE 9. THE EMERGENCY SPILLWAY SHALL BE CHECKED REGULARLY TO ENSURE THAT ITS LINING ALBEMARLE PRIOR TO BEGINNING CONSTRUCTION. STABILIZED WITH A PERMANENT SEED MIXTURE ACCEPTABLE TO THAT TIME OF YEAR. IS WELL ESTABLISHED AND EROSION RESISTANT. GRASS SHALL BE KEPT MOWN BELOW A 5. A PRE -CONSTRUCTION MEETING WITH THE ENGINEER, THE CERTIFIED LAND DISTURBER;, PREPARE SURFACE WITH APPROVED TREATMENT AND ADDITIVES PRIOR TO APPLYING HEIGHT OF 15" AND THE OUTLET SHOULD BE CHECKED FOR CLOGGING. 10 AND THE ENVIRONMENTAL INSPECTOR MAY ALSO BE REQUIRED. ALLOW 72 HOURS FOR SEED. COORDINATION AND SCHEDULING OF PRE -CONSTRUCTION MEETING. 10. THE DAM SECTION SHALL BE KEPT FREE OF SAPLINGS OR TREES.(REFER TO THE 5. MULCH (3.35) - PLANT RESIDUES OR OTHER SUITABLE MATERIALS SHALL BE APPLIED TO ADDITIONAL MAINTENANCE SPECIFICATIONS) PROJECT DESCRIPTION DISTURBED SURFACES TO PREVENT EROSION AND REDUCE OVERLAND FLOW VELOCITIES. THE PURPOSE OF THIS PROJECT IS TO CONSTRUCT THIRTY-ONE (31) SINGLE FAMILY THIS PRACTICE SHOULD BE APPLIED TO ALL SEEDING OPERATIONS, OTHER PLANTER 11,. ALL SEEDED AREAS WILL BE CHECKED REGULARLY TO ENSURE THAT A GOOD STAND IS DWELLINGS AND SIXTY (60) SINGLE FAMILY ATTACHED UNITS, UTILITY SERVICES MATERIALS WHICH DO NOT PROVIDE ADEQUATE SOIL PROTECTION BY THEMSELVES, AND MAINTAINED. AREAS SHOULD BE FERTILIZED AND RE -SEEDED AS NEEDED. DETACHED AND ROAD FRONTAGE AND SUBSEQUENT INFRASTRUCTURE. ALL EXISTING AND PROPOSED) BARE AREAS WHICH CANNOT BE SEEDED DUE TO THE SEASON BUT WHICH STILL NEED RUNOFF FROM THE DEVELOPMENT WITHIN THIS SECTION WILL OUTFALL TO THREE STORMWATERPROTECTION TO PREVENT SOIL LOSS. CRIMPING PUNCH ROLLER -TYPE ROLLERS OR CALCULATIONS MANAGEMENT FACILITIES. THE LIMITS OF DISTURBANCE INCLUDES APPROXIMATELY 27.13 TRACK WALKING MAY BE USED TO INCORPORATE STRAW MULCH INTO THE SOIL ON SEE SHEETS 6, 7, & 8 FOR SIZING. SLOPES IF STRAW IS TO BE USED. ACRES OF LAND DISTURBING ACTIVITIES. SEQUENCE OF CONSTRUCTION EXISTING SITE CONDITIONS 6. EROSION CONTROL BLANKETS (3.36) -EROSION CONTROL BLANKETS IN CONJUNCTION 1. AFTER OBTAINING ALL REQUIRED PERMITS THE CONTRACTOR SHALL COORDINATE A THE PROJECT AREA HAS BEEN USED AS A STOCKPILE AND STAGING AREA DURING THE WITH PERMANENT SEEDING WILL BE INSTALLED ON ALL SLOPES STEEPER THAN 3:1 FOLLOWING GRADING. EROSION CONTROL BLANKETS WILL ALSO BE INSTALLED IN DITCHES PRE -CONSTRUCTION MEETING, ALLOWING 72 HOURS FOR ITS COORDINATION. DEVELOPMENT OF THE SURROUNDING BLOCKS OF OLD TRAIL VILLAGE. IT HAS BEEN WHERE POTENTIAL EROSIVE VELOCITIES MAY EXIST AS DETERMINED BY ENGINEERING WHERE STABILIZED AND IS MOSTLY OPEN AND GRASS COVERED. THERE ARE TWO EXISTING SEDIMENT THIS WILL PROTECT FROM RILL AND GULLY EROSION. TRAPS; THEY ARE LOCATED ALONG THE SOUTHERN EDGE OF THE PROJECT AREA (WP0201400047) THERE ARE TWO EXISTING SEDIMENT BASINS. THESE MEASURES WILL 7. TREE PROTECTION (3.38) - THE TREE FENCE BARRIER WILL BE INSTALLED TO PROTECT REMAIN IN PLACE TO CAPTURE THE SITE'S RUNOFF DURING THE PRELIMINARY CONSTRUCTION THE TREES OUTSIDE OF THE LIMITS OF DISTURBANCE AS INDICATED ON THE EROSION AND ACTIVITIES. THOSE TRAPS WILL BE MODIFIED INTO SEDIMENT BASINS AS CONSTRUCTION SEDIMENT CONTROL PLAN. PROGRESSES. INSTALLATION AND MAINTENANCE OF THE PERIMETER CONTROLS THROUGHOUT CONSTRUCTION IS CRITICAL TO PREVENTING SEDIMENT LATENT RUNOFF FROM EXITING THE 8, DUST CONTROL (3.39) - DUST CONTROL METHODS MUST BE USED TO REDUCE THE Si TE. AMOUNT OF AIRBORNE DUST DURING ALL PHASES OF CONSTRUCTION WHERE SOIL IS EXPOSED OR DISTURBED. ADJACENT AREAS FIELDING RUN DRIVE FORMS THE WESTERN BORDER, LICKINGHOLE CREEK LIES TO THE NORTH, MANAGEMENT STRATEGIES SLABTOWN BRANCH LIES TO THE SOUTH OF THE PROJECT SITE. THE PROJECT SITE IS BOUND 1. CONSTRUCTION WILL BE SEQUENCED SO THAT GRADING OPERATIONS CAN BE SEQUENCED, TO THE EAST BY THE EASTERN BOUNDARY OF THE OLD TRAIL PROPERTY. THIS BOUNDARY IS AND ALSO BEGIN AND END AS QUICKLY AS POSSIBLE. ADJACENT TO A COUNTY PARK, PRIVATE RESIDENTIAL LOTS AND AN EXISTING POND AND WETLAND AREA THAT DRAIN TO SLABTOWN BRANCH. 2. THE CONSTRUCTION ENTRANCE AND PERIMETER EROSION CONTROL MEASURES SUCH AS TREE PROTECTION AND SILT FENCE SHALL BE INSTALLED AS THE FIRST STEP OF OFF-SITE AREAS DISTURBANCE. NO CONSTRUCTION OUTSIDE THE LIMITS OF DISTURBANCE SHOWN IS REQUIRED. ANY SURPLUS OR SHORTAGE SHALL BE BROUGHT TO OR OBTAINED FROM A SITE WITH APPROVED AND 3. SEDIMENT TRAPPING MEASURES SHALL BE INSTALLED WITH PERIMETER SILT FENCE PRIOR ADEQUATE EROSION CONTROL PROTECTION. TO ANY GRADING AND SHALL BE SEEDED AND MULCHED IMMEDIATELY FOLLOWING INSTALLATION. SOILS 25B - DYKE SILT LOAM (2% TO 7%) 4. THE SEDIMENT TRAPS AND SEDIMENT BASINS SHALL BE CHECKED FOR SEDIMENT SOIL IS DEEP, GENTLY SLOPING AND WELL -DRAINED, AND IS IN HYDROLOGIC GROUP B. ACCUMULATION AFTER EVERY RUNOFF PRODUCING STORM EVENT. SEDIMENT SHOULD BE PERMEABILITY AND WATER CAPACITY ARE MODERATE. SURFACE RUNOFF AND EROSION REMOVED WHEN IT REACHES ONE-HALF OF THE DESIGN VOLUME OF THE WET STORAGE. HAZARD 1S MEDIUM. 5. TEMPORARY SEEDING OR OTHER STABILIZATION METHODS, SUCH AS BASE AGGREGATE 26C3 - DYKE CLAY LOAM (7% TO 15%, SEVERELY ERODED) WILL FOLLOW IMMEDIATELY AFTER REACHING FINAL GRADES. SOIL IS DEEP, STRONGLY SLOPING AND WELL -DRAINED, AND IS IN HYDROLOGIC GROUP B. 6. ALL SEEDED AREAS WILL BE CHECKED REGULARLY TO ENSURE THAT A GOOD STAND IS PERMEABILITY AND WATER CAPACITY ARE MODERATE. SURFACE RUNOFF IS RAPID AND MAINTAINED. AREAS SHOULD BE FERTILIZED AND RE -SEEDED AS NEEDED TO ESTABLISH FRO ION HAZARD i5 SEVERE. GROWTH.. 37C3 - HAYESVILLE CLAY LOAM (7% TO 15%, SEVERELY ERODED) 7, THE JOB SUPERINTENDENT SHALL BE RESPONSIBLE FOR THE INSTALLATION AND SOIL IS DEEP, STRONGLY SLOPING AND WELL -DRAINED, AND IS HYDROLOGIC GROUP B. MAINTENANCE OF ALL EROSION AND SEDIMENT CONTROL PRACTICES. PERMEABILITY AND WATER CAPACITY ARE MODERATE, SURFACE RUNOFF IS RAPID AND EROSION HAZARD IS SEVERS 8. DURING FINE GRADING OPERATIONS, MAINTAIN ALL DIVERSION DITCHES TO THE SEDIMENT TRAPS. THE SEDIMENT TRAPS SHALL REMAIN FUNCTIONAL THROUGHOUT INSTALLATION OF THE STORM SEWER INLETS, P1PES,OUTFALLS. 37D3 - HAYESVILLE CLAY LOAM (15% TO 25%, SEVERELY ERODED) SOIL IS DEEP, MODERATELY STEEP AND WELL -DRAINED, AND IS IN HYDROLOGIC GROUP B. 9. INSTALL SILT FENCE INLET PROTECTION TRAPPING MEASURES AT EACH INLET LOCATION PERMEABILITY AND WATER CAPACITY ARE MODERATE. SURFACE RUNOFF IS RAPID AND HAZARD ARE SEVERE, WITHIN THE DITCH. EROSION 10, WHILE THE SEDIMENT TRAPS REMAIN FUNCTIONAL FOR THE DISTURBED AREAS, INSTALL 56B - MEADOWVILLE LOAM (2% TO 7%) THE SEDIMENT BASINS AND OUTLET PROTECTION MEASURES PER THE SPECIFICATIONS. SOIL IS DEEP, GENTLY SLOPING AND WELL DRAINED, AND IS IN HYDROLOGIC GROUP B. PERMEABILITY IS MODERATE TO MODERATELY RAPID. WATER CAPACITY IS HIGH. SURFACE 11. AFTER BEING NOTIFIED BY THE EROSION AND SEDIMENT CONTROL ADMINISTRATOR, THE RUNOFF IS MEDIUM AND EROSION HAZARD IS MODERATE. TEMPORARY EROSION AND SEDIMENT CONTROLS CAN BE CLEANED UP OR REMOVED, AND THE SEDIMENT TRAPS CAN BE FILLED IN AND SEEDED, THEREBY REDIRECTING DRAINAGE 66E - PARKER VERY STONY LOAM (25% TO 45%) TO THE PERMANENT FACILITIES. SOIL IS DEEP AND EXCESSIVELY DRAINED ON STEEP SLOPES, AND IS HYDROLOGIC GROUP 13. PERMEABILITY IS MODERATELY RAPID AND AVAILABLE WATER CAPACITY IS LOW. SURFACE PERMANENT STABILIZATION RUNOFF IS VERY RAPID AND EROSION HAZARD IS VERY SEVERE. .R• ALL AREAS DISTURBED BY CONSTRUCTION SHALL BE STABILIZED WITH STRAW & SEED IMMEDIATELY FOLLOWING FINISHED GRADE. SEEDING SHALL BE DONE WITH KENTUCKY 31 TALL STRUCTURAL PRACTICES FESCUE IN ACCORDANCE TO STANDARD AND SPECIFICATION 3.32, PERMANENT SEEDING, OF 1. SAFETY FENCE (3.01) - A TEMPORARY SAFETY FENCE SHALL BE CONSTRUCTED AROUND THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK. ANY FERTILIZER AND LIME THE SANITARY MANHOLES 9 THROUGH 11 DURING STAGE 3 CONSTRUCTION TO PROTECT APPLICATIONS SHALL BE IN ACCORDANCE WITH SOIL TEST RESULTS. ALL SEEDED AREAS THE MANHOLES AND SANITARY LINE FROM CONSTRUCTION TRAFFIC. WILL BE STRAW MULCHED TO PROTECT AGAINST RILL EROSION AND TO PRESERVE SOIL MOISTURE THAT WILL ENHANCE SEED GERMINATION. CRIMPING, PUNCH ROLLER -TYPE ROLLERS, 2. TEMPORARY CONSTRUCTION ENTRANCE (3.02) - A TEMPORARY CONSTRUCTION ENTRANCE OR TRACK WALKING MAY BE USED TO INCORPORATE STRAW MULCH INTO THE SOIL ON SHALL BE INSTALLED AT SITE ENTRANCE OFF OF CARROLL CREEK ROAD. SLOPES IF STRAW IS TO BE USED, 3. ROAD STABILIZATION (3.03) - ACCESS ROADS, PARKING AREAS, AND OTHER ON-SITE EROSION CONTROL MAINTENANCE VEHICLE TRANSPORTATION ROUTES SHALL BE STABILIZED WITH STONE IMMEDIATELY AFTER 1. IN GENERAL, ALL EROSION AND SEDIMENT CONTROL MEASURES SHALL BE CHECKED DAILY GRADING. AND AFTER EACH SIGNIFICANT RAINFALL. THE FOLLOWING ITEMS WILL BE CHECKED IN PARTICULAR: 4. SILT FENCE BARRIER (3.05) - SILT FENCE BARRIERS WILL BE INSTALLED TO FILTER RUNOFF FROM SHEET FLOW AS INDICATED ON THE EROSION AND SEDIMENT CONTROL 2. THE CONSTRUCTION ENTRANCE SHALL BE CHECKED DAILY FOR SOIL BUILDUP. IF THE PLAN. ENTRANCE BECOMES CLOGGED WITH SOIL AND FAILS TO PREVENT TRANSPORTATION OF SOIL ONTO THE ROADWAY, ADDITIONAL STONE, REPLACEMENT OF STONE, OR A 5. SUPER SILT FENCE BARRIER - WIRE -REINFORCED SILT FENCE BARRIER WILL BE WASH -RACK MAY BE REQUIRED. INSTALLED TO FILTER RUNOFF FROM SHEET FLOW AS INDICATED ON THE EROSION AND SEDIMENT CONTROL PLAN. 3. SILT FENCE SHALL BE INSPECTED IMMEDIATELY AFTER EACH RAINFALL AND AT LEAST DAILY DURING PROLONGED RAINFALL. CLOSE ATTENTION SHALL BE PAID TO THE REPAIR 6. INLET PROTECTION (3.07) - INLET PROTECTION WILL BE INSTALLED AT ALL PROPOSED OF DAMAGED SILT FENCE RESULTING FROM END RUNS AND UNDERCUTTING. SHOULD THE STORM DRAIN INLETS INSTALLED PRIOR TO FINAL STABILIZATION OF THE SITE. FABRIC ON A SILT FENCE DECOMPOSE OR BECOME INEFFECTIVE PRIOR TO THE END OF THE EXPECTED USABLE LIFE AND THE BARRIER STILL BE NECESSARY, THE FABRIC SHALL 7, TEMPORARY DIVERSION DIKES (3.09) - A SYSTEM OF DIVERSION DIKES TO DIRECT FLOW BE REPLACED PROMPTLY. SEDIMENT DEPOSITS SHOULD BE REMOVED AFTER EACH STORM INTO THE SEDIMENT TRAP. WILL BE INSTALLED AS SHOWN ON THE EROSION AND EVENT. THEY MUST BE REMOVED WHEN DEPOSITS REACH APPROXIMATELY ONE-HALF SEDIMENT CONTROL PLAN. THE HEIGHT OF THE BARRIER. ANY SEDIMENT DEPOSITS REMAINING IN PLACE AFTER THE SILT FENCE IS NO LONGER REQUIRED SHALL BE DRESSED TO CONFORM WITH THE 8. CLEAN -WATER DIVERSION DIKES - A SYSTEM OF DIVERSION DIKES TO DIRECT THE FLOW EXISTING GRADE, PREPARED, AND SEEDED. OF CLEAN OFFSITE WATER AWAY FROM THE SITE WILL BE INSTALLED AS SHOWN ON THE EROSION AND SEDIMENT CONTROL PLAN. 4. DIVERSION DIKES SHALL BE INSPECTED AFTER EVERY STORM AND REPAIRS MADE TO THE DIKE, FLOW CHANNEL, OUTLET, OR SEDIMENT TRAPPING FACILITY AS NECESSARY. ONCE 9. RIGHT -WAY -DIVERSION (3.11) - A GRAVEL DIVERSION DIKE TO ACCOMMODATE THE EVERY TWO WEEKS, WHETHER A STORM EVENT HAS OCCURRED OR NOT, THE MEASURE CONSTRUCTION TRAFFIC WHILE MAINTAINING THE INTEGRITY OF THE DIVERSION DIKE SET SHALL BE INSPECTED AND REPAIRS MADE IF NEEDED. DAMAGES CAUSED BY TO DIRECT WATER TO SEDIMENT TRAP. WILL BE INSTALLED AS SHOWN ON THE EROSION CONSTRUCTION TRAFFIC OR OTHER ACTIVITY MUST BE REPAIRED BEFORE THE END OF EACH WORKING DAY. AND SEDIMENT CONTROL PLAN. 5. STORMWATER CONVEYANCE CHANNELS: 10. TEMPORARY SEDIMENT TRAP (3.13) - A TEMPORARY SEDIMENT TRAP IS TO BE GRASS LINED CHANNELS -DURING THE INITIAL ESTABLISHMENT, GRASS LINED CHANNELS CONSTRUCTED IN CONJUNCTION WITH CULVERT INLET PROTECTION. CALCULATIONS FOR CONSTRUCTED SHOULD BE REPAIRED IMMEDIATELY AND RE-ESTABLISHED IF NECESSARY. AFTER GRASS THE SEDIMENT TRAP ARE SHOWN WITH THE EROSION AND SEDIMENT CONTROL DETAILS. HAS BECOME ESTABLISHED, THE CHANNEL SHOULD BE CHECKED PERIODICALLY TO DETERMINE IF THE GRASS IS WITHSTANDING FLOW VELOCITIES WITHOUT DAMAGE. IF THE 11. OUTLET PROTECTION (3.18) - OUTLET PROTECTION WILL BE INSTALLED AT THE END OF CHANNEL IS TO BE MOWED, IT SHOULD BE DONE IN A MANNER THAT IT WILL NOT ALL STORM SEWER PIPES. CALCULATIONS FOR THE OUTLET PROTECTION ARE SHOWN WITH DAMAGE THE GRASS. THE EROSION AND SEDIMENT CONTROL DETAILS. THE RIPRAP SHOULD BE CHECKED 5.2. RIPRAP-LINED CHANNELS - RIPRAP LINED CHANNELS SHOULD BE CHECKED PERIODICALLY op PERIODICALLY TO ENSURE SCOURING IS NOT OCCURRING BENEATH FABRIC UNDERLINING TO ENSURE THE SCOUR IS NOT OCCURRING BENEATH FABRIC UNDERLINING OF THE �I� OF THE RIPRAP LAYER. RIPRAP LAYER. THE CHANNEL SHOULD ALSO BE CHECKED TO DETERMINE THE STONES o��yTH ARE NOT DISLODGED BY LARGE FLOWS. ✓ VEGETATIVE PRACTICES 5.3.IF SEDIMENT IS DEPOSITED 1N A GRASS -LINED CHANNEL, IT SHOULD BE REMOVED U 1. SURFACE ROUGHENING (3.29) - ALL AREAS WITH A GRADE STEEPER THAN 3:1 SHALL 63E PROMPTLY TO PREVENT DAMAGE TO THE GRASS. SEDIMENT DEPOSITED IN A RIPRAP STAIR -STEP GRADED OR GROOVED (PLATE 3,29-4) TO AID IN GRASS ESTABLISHMENT, CHANNEL SHOULD BE REMOVED WHEN IT REDUCES THE CAPACITY OF THE CHANNEL. WILLIAM J. LEDBETTER INCREASE INFILTRATION, AND TO SLOW RUNOFF VELOCITIES. Lic. No. 1507-B 6. CHECK DAMS SHALL BE CHECKED FOR SEDIMENT ACCUMULATION AFTER EVERY RUNOFF 2. TOPSOILING & STOCKPILING (3.30) - TOPSOIL WILL BE STRIPPED FROM AREAS TO BE PRODUCING STORM EVENT. SEDIMENT SHOULD BE REMOVED WHEN IT REACHES ONE-HALF GRADED AND STOCKPILED FOR LATER USE. STOCKPILES ARE TO BE STABILIZED WITH OF THE ORIGINAL HEIGHT OF THE MEASURE. REGULAR INSPECTIONS SHALL BE MADE TO INSURE THE CENTER OF EACH DAM IS LOWER THAN THE EDGES. EROSION CAUSED BY REVISIONS COUNTY COMMENTS Murch 15, 2016 COUNTY COMMENTS May 13, 2015 COUNTY COMMENTS May 23, 2015 AMENDMENT August 11, 2015 ATE pian. 25, 2015 FILE NUMBED 3053 SHEET 9of9 i a Lli f: IA f > z ED � j (1) zl 0 '' • f Cr. .6 0 .. 10 LLJ FILE NUMBED 3053 SHEET 9of9