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HomeMy WebLinkAboutWPO201400023 Plan - Approved 2014-03-200, 3 'v U U) O O O y C v 0 W tl- O �i O O N / U C m 0 N / Be F. YANCEY ELEMENTARY SCHOOL WASTEWATER TREATMENT IMPROVEMENTS EROSION &SEDIMENT CONTROL PLAN 1 OF 11 EC -1 COVER SHEET 2 OF 11 EC -2 GENERAL NOTES, ABBREVIATIONS AND LEGEND 3 OF 11 EC -3 EXISTING CONDITIONS 4 OF 11 EC -4 EROSION AND SEDIMENT CONTROL PLAN 5 OF 11 EC -5 EROSION AIVD SEDIMENT CONTROL NARRATIVE 6 OF 11 EC -6 EROSION AND SEDIMENT CONTROL DETAILS 7 OF 11 EC -7 PRE AND POST DEVELOPMENT DRAINAGE AREAS 8 OF 11 EC -8 PRE AND POST DEVELOPMENT BMP ANALYSIS AREAS 9 OF 11 EC -9 STORMWATER MANAGEMENT DETAILS AND NOTES 10 OF 11 EC -10 STORMWATER MANAGEMENT ROUTINGS AND CALCULATIONS 11 OF 11 EC -11 MS -19 ANALYSIS AND STORM CALCULATIONS 6) C 1 ADDRESSED COUNTY COMMENTS DATED 3 -27 -14 SAR 5 -8 -14 'Z [ I N0. I SHEET REVISION SHEET REVISION ALBEMARLE COUNTY, VIRGINIA 10"v WPO 2014 -00023 VICINITY MAP SCALE: 1"=2000' k Lic, No. 12257— I: jpNAU � SITE DATA DEVELOPER f APPLICANT: SOURCE OF SURVEY: SOURCE OF TOPOGRAPHY: COUNTY, STATE: MAGISTERIAL DISTRICT: SCHOOL BOARD OF ALBEMARLE COUNTY BUILDING SERVICES DEPARTMENT 2751 HYDRAULIC ROAD CHARLOTTESVILLE, VA 22901 -8917 PHONE: (434) 975 -9340 ATTN: MS. LINDSAY SHODDY, P.E. EMAIL: LCSNODDY ®K12ALBEMARLE.ORG WATER SUPPLY PROTECTION AREA: TAX MAP /PARCEL: ZONING: OVERLAY DISTRICT: W'A ® ENGINEERS SURVEYORS PLANNERS ASSOCIATES PO Box 4119 3040 Avemore Squire Pl. Lynchburg, VA 24502 ClhiilouesviNc. VA 22911 Phone: 434.316.6080 Phone: 434.984.2700 www.wwassociates. ue t FIB, )v This copy of the approved plan is reserved for the official files of Albemarle County; Please do not remove this plan from the file, APPROVED b`l kl•�e,��ll�errlari� t✓; Eh p ,'?rlrnen( File .- rQ &_ Lehl z ENGINEER: WW ASSOCIATES, INC 3040 AVEMORE SQUARE PLACE CHARLOTTESVILLE, VA 22911 (434) 984 -2700 ATTN: HERBERT F. WHITE III, P.E. EMAIL: HWHITEOWWASSOCIATES.NET WW` ASSOCIATES, INC DATED: FEBRUARY 14, 2014 AERIAL SURVEY BY VIRGINIA RESOURCE MAPPING 210'.N. 21ST STREET, UNIT A PURCELLVILLE VIRGINIA 20132 li, TELEPHONE: 540- 338 -3136 DATE OF PHOTOGRAPHY: JANUARY 31, 2014 ALBEMARLE COUNTY, VA SAMUEL MILLER TOTTER CREEK TMP 128A2 -18 & 22 RA (RURAL AREAS) ENTRANCE CORRIDOR TM 128A2 -15 AND 18 SUPPLEMENTAL GROUND /FIELD SURVEY BY WW ASSOCIATES, INC JANUARY /FEBRUARY, 2014 DESIGNED BY: PROJECT: B. F. YANCEY ELEMENTARY SCHOOL OP 1 EMERYS N WASTEWATER TREATMENT IMPROVEMENTS EROSION & SEDIMENT CONTROL PLAN ALBEMARLE COUNTY, VIRGINIA 1 DRAWN BY: KTM LN. TITLE: COVER SHEET G 0 EC -1 DIHR BY: HFW m� Q SHEET NUMBER: I WWA NUMBER: FILE NAME: DISCIPLINE: SCALE: DATE: 213003.04 300304C_CS.dwg CIVIL H: AS SHOWN 31131141 1 of 11 V. NIA 2 IRISH ROAD 6) (ROUTE SITE IRISH (ROUTE �' 6) C Ao o--'4 m LA G�G��� v ° VICINITY MAP SCALE: 1"=2000' k Lic, No. 12257— I: jpNAU � SITE DATA DEVELOPER f APPLICANT: SOURCE OF SURVEY: SOURCE OF TOPOGRAPHY: COUNTY, STATE: MAGISTERIAL DISTRICT: SCHOOL BOARD OF ALBEMARLE COUNTY BUILDING SERVICES DEPARTMENT 2751 HYDRAULIC ROAD CHARLOTTESVILLE, VA 22901 -8917 PHONE: (434) 975 -9340 ATTN: MS. LINDSAY SHODDY, P.E. EMAIL: LCSNODDY ®K12ALBEMARLE.ORG WATER SUPPLY PROTECTION AREA: TAX MAP /PARCEL: ZONING: OVERLAY DISTRICT: W'A ® ENGINEERS SURVEYORS PLANNERS ASSOCIATES PO Box 4119 3040 Avemore Squire Pl. Lynchburg, VA 24502 ClhiilouesviNc. VA 22911 Phone: 434.316.6080 Phone: 434.984.2700 www.wwassociates. ue t FIB, )v This copy of the approved plan is reserved for the official files of Albemarle County; Please do not remove this plan from the file, APPROVED b`l kl•�e,��ll�errlari� t✓; Eh p ,'?rlrnen( File .- rQ &_ Lehl z ENGINEER: WW ASSOCIATES, INC 3040 AVEMORE SQUARE PLACE CHARLOTTESVILLE, VA 22911 (434) 984 -2700 ATTN: HERBERT F. WHITE III, P.E. EMAIL: HWHITEOWWASSOCIATES.NET WW` ASSOCIATES, INC DATED: FEBRUARY 14, 2014 AERIAL SURVEY BY VIRGINIA RESOURCE MAPPING 210'.N. 21ST STREET, UNIT A PURCELLVILLE VIRGINIA 20132 li, TELEPHONE: 540- 338 -3136 DATE OF PHOTOGRAPHY: JANUARY 31, 2014 ALBEMARLE COUNTY, VA SAMUEL MILLER TOTTER CREEK TMP 128A2 -18 & 22 RA (RURAL AREAS) ENTRANCE CORRIDOR TM 128A2 -15 AND 18 SUPPLEMENTAL GROUND /FIELD SURVEY BY WW ASSOCIATES, INC JANUARY /FEBRUARY, 2014 DESIGNED BY: PROJECT: B. F. YANCEY ELEMENTARY SCHOOL SET REV. N0. DMJ WASTEWATER TREATMENT IMPROVEMENTS EROSION & SEDIMENT CONTROL PLAN ALBEMARLE COUNTY, VIRGINIA 1 DRAWN BY: KTM DRAWING NUMBER: TITLE: COVER SHEET EC -1 DIHR BY: HFW SHEET NUMBER: WWA NUMBER: FILE NAME: DISCIPLINE: SCALE: DATE: 213003.04 300304C_CS.dwg CIVIL H: AS SHOWN 31131141 1 of 11 V. NIA 3 v v Z UI tt M o° i c 0 a W 0 �i 0 0 N U c �m 0 N i C GENERAL CONSTRUCTION NOTES FOR SITE PLANS (SOURCE: ALBEMARLE COUNTY ENGINEERING & PUBLIC WORKS POLICIES) 1. PRIOR TO ANY CONSTRUCTION WITHIN ANY EXISTING PUBLIC RIGHT -OF -WAY, INCLUDING CONNECTION TO ANY EXISTING ROAD, A PERMIT SHALL BE OBTAINED FROM THE VIRGINIA DEPARTMENT OF TRANSPORTATION (VDOT). THIS PLAN AS DRAWN MAY NOT ACCURATELY REFLECT THE REQUIREMENTS OF THE PERMIT. WHERE ANY DISCREPANCIES OCCUR, THE REQUIREMENTS OF THE PERMIT SHALL GOVERN. 2. ALL PAVING, DRAINAGE RELATED MATERIALS AND CONSTRUCTION METHODS SHALL CONFORM TO CURRENT SPECIFICATIONS AND STANDARDS OF VDOT UNLESS OTHERWISE NOTED. 3. EROSION AND SILTATION CONTROL MEASURES SHALL BE PROVIDED IN ACCORDANCE WITH THE APPROVED EROSION CONTROL PLAN AND SHALL BE INSTALLED PRIOR TO ANY CLEARING, GRADING OR OTHER CONSTRUCTION. 4. ALL SLOPES AND DISTURBED AREAS ARE TO BE FERTILIZED, SEEDED AND MULCHED. THE MAXIMUM ALLOWABLE SLOPE IS 2:1 (HORIZONTAL: VERTICAL). WHERE REASONABLY OBTAINABLE, LESSER SLOPES OF 3:1 OR BETTER ARE TO BE ACHIEVED. 5. PAVED, RIP -RAP OR STABILIZATION MAT LINED DITCH MAY BE REQUIRED WHEN IN THE OPINION OF THE ALBEMARLE COUNTY DIRECTOR OF ENGINEERING, OR THE DIRECTOR'S DESIGNEE, IT IS DEEMED NECESSARY IN ORDER TO STABILIZE A DRAINAGE CHANNEL. 6. ALL TRAFFIC CONTROL SIGNS SHALL CONFORM TO THE MANUAL FOR UNIFORM TRAFFIC CONTROL DEVICES AND THE VIRGINIA SUPPLEMENT. 7. UNLESS OTHERWISE NOTED ALL CONCRETE PIPE SHALL BE REINFORCED CONCRETE PIPE - CLASS III. 8. ALL EXCAVATION FOR UNDERGROUND PIPE INSTALLATION MUST COMPLY WITH OSHA STANDARDS FOR THE CONSTRUCTION INDUSTRY (29 CFR PART 1926). SITE PLAN NOTES 1. ALL CONSTRUCTION SHALL CONFORM TO ALBEMARLE COUNTY AND VIRGINIA DEPARTMENT OF TRANSPORTATION STANDARDS AND SPECIFICATIONS. 2. CONTRACTOR TO VERIFY FIELD CONDITIONS PRIOR TO AND DURING CONSTRUCTION AND NOTIFY OWNER AND ENGINEER IMMEDIATELY OF ANY DISCREPANCIES BETWEEN ACTUAL FIELD CONDITIONS AND APPROVED PLAN. 3. EXISTING MANHOLE FRAMES AND COVERS AND VALVE BOXES AND COVERS TO REMAIN SHALL BE ADJUSTED OR RECONSTRUCTED, AS NECESSARY, TO MATCH FINISHED GRADES. 4. ALL INTERNAL STREETS AND PARKING AREAS ARE TO BE PRIVATELY OWNED AND MAINTAINED, EXCEPT WHERE OTHERWISE NOTED. 5. ALL INTERNAL WALKWAYS OUTSIDE OF R/W, UNLESS OTHERWISE NOTED, ARE TO BE PRIVATELY OWNED AND MAINTAINED. 6. EARTH SWALES AND STORM SEWER CONNECTIONS SHALL BE CONSTRUCTED IMMEDIATELY FOLLOWING CLEARING AND GRUBBING. 7. ALL ON SITE IMPROVEMENTS ARE SUBJECT TO INSPECTION UNDER ALBEMARLE COUNTY CODES. 8. ALL STAIRS WITH THREE OR MORE RISERS ARE TO HAVE HANDRAILS ON BOTH SIDES. 9. ALL CONDENSATE DRAIN AND OTHER PLUMBING CONNECTIONS ARE TO BE INSTALLED ACCORDING TO CURRENT PLUMBING CODE. 10. CONTRACTOR TO VERIFY ALL SITE PLANS AND PROFILES AND DETAILS FOR CONSISTENCY AND IF CONFLICT EXISTS, CONTACT ENGINEER FOR CLARIFICATION AND /OR DIRECTION. INTERPRETATION DETERMINED BY CONTRACTOR SHALL BE DONE AT HIS /HER OWN RISK. 11. SOLID WASTE WILL BE COLLECTED IN LOCATIONS THROUGHOUT THE SITE AND PICKED UP BY PRIVATE SERVICE AS NECESSARY. MISCELLANEOUS NOTES 1. BASED ON GRAPHIC DETERMINATION, THE PROPERTY DESCRIBED HEREON LIES WITHIN FLOOD ZONE "X", AREAS OUTSIDE OF THE 0.2% ANNUAL CHANCE FLOODPLAIN, AS DETERMINED BY THE UNITED STATES FEDERAL EMERGENCY MANAGEMENT AGENCY, AND AS SHOWN ON THE FLOOD INSURANCE RATE MAP (FIRM), COMMUNITY 510006, PANEL NUMBER 525 -D WITH AN EFFECTIVE DATE OF FEBRUARY 4, 2005. 2. THE CONTRACTOR SHALL VERIFY ALL UTILITY INFORMATION PRIOR TO CONSTRUCTION TO INCLUDE TYPE AND SIZE OF PIPE AND SERVICES TO HIS OWN SATISFACTION. 3. THE COORDINATES AND ELEVATIONS SHOWN ARE TIED TO THE STATE PLANE COORDINATE SYSTEM. 4. HORIZONTAL DATUM: NAD -83 5. VERTICAL DATUM: NAVD 88 COORDINATION NOTES 1. THE CONTRACTOR SHALL OBTAIN THE FOLLOWING PERMITS REQUIRED FOR CONSTRUCTION OF THESE PLANS: ALBEMARLE COUNTY LAND DISTURBANCE PERMITS, VIRGINIA STORMWATER MANAGEMENT PROGRAM (VSMP) GENERAL PERMIT, AND ALBEMARLE COUNTY BUSINESS LICENSE. CONTRACTOR SHALL OBTAIN VDOT LAND -USE PERMITS FOR THE PROJECT. CONTRACTOR SHALL PROVIDE ALL NECESSARY FORMS AND FEES FOR OBTAINING THE PERMITS, INCLUDING APPLICATION FEES AND REQUIRED BONDING COSTS. 2. ANY TIME WORK IS PERFORMED OFF -SITE OR WITHIN AN EXISTING EASEMENT, THE CONTRACTOR IS TO NOTIFY THE HOLDER OF SAID EASEMENT AS TO THE NATURE OF PROPOSED WORK, AND TO FOLLOW ANY GUIDELINES OR STANDARDS WHICH ARE ASSOCIATED WITH OR REFERENCED IN THE RECORDED EASEMENT. 3. THE CONTRACTOR IS TO CHECK THAT ALL EASEMENTS, LETTERS OF PERMISSION, ETC. ARE RECORDED /OBTAINED PRIOR TO THE START OF ANY CONSTRUCTION. 4. THE CONTRACTOR IS TO VERIFY THAT THE RELOCATION OF ALL EXISTING UTILITIES IN CONFLICT WITH PROPOSED WORK HAS BEEN COMPLETED, INCLUDING UTILITY POLES. 5. CONTRACTOR SHALL COMPLY WITH FENCING AND TREE PRESERVATION SIGNAGE REQUIRED BY ALBEMARLE COUNTY CODE. 6. CONTRACTOR SHALL COMPLY WITH ALL WETLAND PERMIT REQUIREMENTS AS SPECIFIED BY THE CORPS OF ENGINEERS AND /OR VA DEPARTMENT OF ENVIRONMENTAL QUALITY. 7. VIRGINIA STORMWATER MANAGEMENT PROGRAM (VSMP) GENERAL PERMIT: PREPARE STORMWATER POLLUTION PREVENTION PLAN, SECURE VSMP PHASE I LAND CLEARING GENERAL PERMIT AND PAY PERMIT APPLICATION FEE TO DEPARTMENT OF ENVIRONMENTAL QUALITY (DEQ). CONTACT DEQ - RICHMOND FOR ADDITIONAL INFORMATION. TELEPHONE NUMBER: (804) 698 -4000. GENERAL NOTES 1. ALL FINISHED GRADING, SEEDING AND SODDING SHALL BE DONE IN SUCH A MANNER TO PRECLUDE THE PONDING OF THE WATER ON THE SITE, PARTICULARLY ADJACENT TO THE BUILDINGS OR STORM INLETS. 2. ALL STREETS OUTSIDE PUBLIC RIGHTS -OF -WAY ARE TO BE PRIVATELY OWNED AND MAINTAINED. 3. CONTRACTOR IS TO VERIFY THAT ALL UTILITIES I.E., WATER, SEWER GAS, ELECTRIC, TELEPHONE, CABLE, ETC, ARE IN PLACE PRIOR TO CONSTRUCTION OF SUBBASE AND /OR PAVING. 4. PROPOSED UNDERGROUND UTILITIES SUCH AS ELECTRIC, TELEPHONE, CABLE AND GAS WHICH SERVE THIS FACILITY SHALL BE LOCATED WITH A MINIMUM 5 FOOT SEPARATION FROM PUBLIC WATER MAINS AND SANITARY SEWER. 5. CROSS SLOPE FOR ALL SIDEWALKS SHALL BE 2 %. 6. CUT AND PATCH WORK IN EXISTING PUBLIC STREETS MUST BE PERFORMED IN ACCORDANCE WITH VDOT AND ALBEMARLE COUNTY STANDARDS AND SPECIFICATIONS. 7. ALL PIPES SHOWN AS RCP ON PLANS SHALL BE REINFORCED CONCRETE PIPE CONFORMING TO ASTM C -76, UNLESS INDICATED OTHERWISE ON PLANS. 8. ALL CONSTRUCTION SHALL COMPLY WITH OSHA SAFETY STANDARD FOR EXCAVATION 1926 PART P AND OTHER APPLICABLE OSHA REQUIREMENTS. 9. THESE PLANS AND PROFILES AND ALL THE NEW CONSTRUCTION WITH THIS PLAN SHALL BE IN ACCORDANCE WITH THE CURRENT APPROVED ALBEMARLE COUNTY SERVICE AUTHORITY'S GENERAL WATER AND SEWER CONSTRUCTION SPECIFICATIONS, ANY AMENDMENTS THEREOF AND THE STANDARDS AND SPECIFICATIONS OF VDOT. 10. SAFETY SLABS ARE REQUIRED IN ALL STRUCTURES GREATER THAN 12' IN HEIGHT. 11. SURFACE DRAINAGE: COMPLETELY DRAIN CONSTRUCTION SITE DURING PERIODS OF CONSTRUCTION TO KEEP SOIL MATERIALS SUFFICIENTLY DRY. PROVIDE TEMPORARY DITCHES, SWALES, AND OTHER DRAINAGE FEATURES AND EQUIPMENT AS REQUIRED TO MAINTAIN DRY SOILS. WHEN UNSUITABLE WORKING PLATFORMS FOR EQUIPMENT OPERATION AND UNSUITABLE SOIL SUPPORT FOR SUBSEQUENT CONSTRUCTION FEATURES DEVELOP, REMOVE UNSUITABLE MATERIAL AND PROVIDE NEW SOIL MATERIAL AS SPECIFIED IN THIS SECTION AT NO ADDITIONAL COST TO THE OWNER. 12. SUBSURFACE DRAINAGE: CONSIDER SITE SURFACE AND SUBSURFACE CONDITIONS, AVAILABLE SOIL, AND HYDROLOGICAL DATA. REMOVE WATER BY BENCHING, SUMP PUMPING, DEEP WELL PUMPING, OR OTHER METHODS TO PREVENT SOFTENING OF SURFACES EXPOSED BY EXCAVATION. USE FILTERS ON DEWATERING DEVICES TO PREVENT REMOVAL OF FINES FROM SOIL. PROVIDE EROSION CONTROL AT OUTLET OR PIPING TO PREVENT EROSION. OPERATE DEWATERING SYSTEM CONTINUOUSLY UNTIL CONSTRUCTION WORK BELOW EXISTING WATER LEVELS IS COMPLETE. 13. PRIOR TO ANY CONSTRUCTION WITHIN ANY EXISTING PUBLIC RIGHT -OF -WAY, INCLUDING CONNECTION TO ANY EXISTING ROAD, A PERMIT SHALL BE OBTAINED FROM THE VIRGINIA DEPARTMENT OF TRANSPORTATION (VDOT). THIS PLAN AS DRAWN MAY NOT ACCURATELY REFLECT THE REQUIREMENTS OF THE PERMIT. WHERE ANY DISCREPANCIES OCCUR THE REQUIREMENTS OF THE PERMIT SHALL GOVERN. 14. ALL PAVING, DRAINAGE RELATED MATERIALS AND CONSTRUCTION METHODS SHALL CONFORM TO CURRENT SPECIFICATIONS AND STANDARDS OF VDOT UNLESS OTHERWISE NOTED. 15. ALL PIPES SHOWN AS HDPE ON PLANS SHALL CONFORM TO AASHTO M294 (TYPE S) SMOOTH WALL INTERIOR PIPE, MATERIAL AND INSTALLATION SHALL BE IN ACCORDANCE WITH VDOT ROAD AND BRIDGE STANDARDS AND ROAD AND BRIDGE SPECIFICATIONS. 16. EROSION AND SEDIMENT CONTROL MEASURES SHALL BE PROVIDED IN ACCORDANCE WITH THE APPROVED EROSION CONTROL PLAN AND SHALL BE INSTALLED PRIOR TO ANY CLEARING, GRADING OR OTHER CONSTRUCTION. 17. ALL TRAFFIC CONTROL SIGNS SHALL CONFORM WITH THE "MANUAL FOR UNIFORM TRAFFIC CONTROL DEVICES'. 18. PRIOR TO COMMENCEMENT OF CONSTRUCTION, THE CONTRACTOR SHALL VERIFY ALL DIMENSIONS AND CONDITIONS AFFECTING HIS WORK INCLUDING EXISTING TOPOGRAPHY. IF THERE ARE ANY DISCREPANCIES WITH WHAT IS SHOWN ON THE CONSTRUCTION DRAWINGS OR TOPOGRAPHIC SURVEY PLAN, THE CONTRACTOR SHALL IMMEDIATELY NOTIFY THE OWNER IN ORDER TO DETERMINE THE COURSE OF ACTION NECESSARY TO CORRECT FOR SUCH DISCREPANCY. FAILING TO NOTIFY THE OWNER AND SECURING SUCH INSTRUCTION, THE CONTRACTOR WILL BE CONSIDERED TO HAVE PROCEEDED AT THEIR OWN RISK AND EXPENSE. 19. CONTRACTOR SHALL BE INFORMED AND SHALL COMPLY WITH THE VIRGINIA OVERHEAD HIGH VOLTAGE LINE SAFETY ACT. ANY COSTS TO COVER LINES OR DISCONNECT SERVICE TO NEARBY POWER LINES SHALL BE AT THE CONTRACTOR'S EXPENSE 20. CONTRACTOR SHALL COMPLY WITH NO LEAD REGULATIONS FOR WATER INFRASTRUCTURE. 21. CONTACT MISS UTILITY AT 1 -800- 552 -7001 48 HOURS PRIOR TO ANY GRADING OR DIGGING TO HAVE UNDERGROUND UTILITIES MARKED. THE CONTRACTOR SHALL VERIFY ALL UTILITY INFORMATION PRIOR TO CONSTRUCTION TO INCLUDE TYPE AND SIZE OF PIPE AND SERVICES TO HIS OWN SATISFACTION. 22. CONTRACTOR SHALL BE INFORMED AND COMPLY WITH THE VIRGINIA OVERHEAD HIGH VOLTAGE LINE SAFETY ACT. ALL COSTS TO COVER LINES, FLAG LINES, OR DISCONNECT SERVICE SHALL BE AT THE CONTRACTORS EXPENSE. ABBREVIATIONS AFF ABOVE FINISHED FLOOR FH FIRE HYDRANT AHD AHEAD FM FORCEMAIN ARV AIR RELEASE VALVE FL FLUORIDE BC BACK OF CURB FOC FACE OF CURB BF BLIND FLANGE GALV GALVANIZED BFF BASEMENT FINISHED FLOOR GV GATE VALVE BM BENCH MARK HB HORIZONTAL BEND BK BACK HC HANDICAP BOV BLOW OFF VALVE HDPE HIGH DENSITY POLYETHELENE CAN CABLE TELEVISION HK HOOK CG CURB & GUTTER ID INNER DIAMETER CIP CAST IRON PIPE INV INVERT WL CENTER LINE IPS IRON PIN SET C.L. CHAIN LINK IPF IRON PIN FOUND CMP CORRUGATED METAL PIPE JB JUNCTION BOX CO CLEAN OUT LAT LATERAL CONC CONCRETE LF LINEAR FEET CPP CORRUGATED PLASTIC PIPE LT LEFT CY CUBIC YARDS MH MANHOLE D.I. DUCTILE IRON NBL NORTH BOUND LANE DIA DIAMETER NIC NOT IN CONTRACT DIP DUCTILE IRON PIPE NTS NOT TO SCALE EL ELEVATION O.C. ON CENTER ELEC ELECTRIC PE POLYETHYLENE EOP EDGE OF PAVEMENT PGL PROFILE GRADE LINE EOTL EDGE OF TRAVEL LANE PROP PROPOSED EQPT EQUIPMENT PS PLANTED STONE FOUND EX OR EXIST EXISTING PVC POLYVINYL CHLORIDE FF FINISHED FLOOR PVMT PAVEMENT NOTES: 1. THE SIZE OF THE SYMBOLS MAY VARY FROM THOSE SHOWN. 2. ALL SYMBOLS AND ABBREVIATIONS SHOWN MAY NOT BE USED. RCP REINFORCED CONCRETE PIPE REQ'D REQUIRED RT RIGHT R/W RIGHT OF WAY SAN SANITARY SEWER SBL SOUTH BOUND LANE SD STORM DRAIN SQ SQUARE S.S. STAINLESS STEEL SSMH SANITARY SEWER MANHOLE STA STATI O N STD STANDARD STL STEEL SW SIDEWALK TBA TO BE ABANDONED TBR TO BE REMOVED TC TOP OF CURB TS &V TAPPING SLEEVE AND VALVE TYP TYPICAL UG UNDERGROUND UON UNLESS OTHERWISE NOTED VB VERTICAL BEND VHD VEHICLES PER DAY W WATER WL WATER LINE WM WATER METER WT WATERTIGHT WWF WOVEN WIRE FABRIC YDS YARDS EX. SYMBOL LEGEND NEW EXISTING LINETYPE LEGEND NEW BENCHMARK /FFE BUILDING OVERHEAD C) BOLLARD ADJACENT PROPERTY LINE 0 BORE HOLE 0 - - - -R /W- - - -R /W- ADJACENT RIGHT -OF -WAY - - - -R /W- - - -R /W- 0 BUILDING COLUMN - - BUILDING COLUMN - - BUSH BOUNDARY PROPERTY LINE CABLE BOX © - - - -R /W - - -R /W- BOUNDARY RIGHT -OF -WAY - - - -R /W - - -R /W- CEMETERY - - - - - BUILDING SETBACK - - - - - - - - - ''� CONIFEROUS TREE BUSH LINE r� DECIDUOUS TREE OHCr OHCT CATV OVERHEAD DRAINAGE INLET GRATE UGCT UGCT CAN UNDER GROUND DRILL HOLE Q OHT OHT TELEPHONE OVERHEAD O ELECTRIC PANEL BOX Q UGT UGT TELEPHONE UNDER GROUND FE-1 ELECTRIC PEDESTAL EE > > > DITCH CENTER LINE > > > 0 ELECTRIC TRANSFORMER ❑ EASEMENT CONSTRUCTION AND GRADING V ELECTRIC MAN HOLE Q EASEMENT SLOPE y FIRE HYDRANT W EASEMENT SANITARY SEWER FLAG POLE �' EASEMENT STORM GAS MAN HOLE © EASEMENT STORMWATER MANAGEMENT GAS METER GM EASEMENT UTILITIES GAS VALVE EASEMENT WATER © GENERATOR © k FENCE BARBED WIRE GROUND LIGHT GUARD RAIL {� GUY POLE EDGE OF GRAVEL HANDICAPPED PARKING FENCE CHAIN LINK - ❑H HEAT PUMP EH FENCE WOOD n 0 IRON PIN Q FENCE WOVEN WIRE n 0 LIGHT POLE 0 GAS GAS GAS UNDER GROUND o MAILBOX TOB TOB TOP OF BANK TOB TOB 0 MONITORING WELL ® OHE OHE ELECTRIC OVERHEAD 0 MONUMENT FOUND UGE UGE ELECTRIC UNDER GROUND 0 MONUMENT SET F-1 RAILROAD CENTERLINE 8 PANEL POINT 8 STREAM CENTERLINE POWER METER ® PAVEMENT ASPHALT POWER POLE 0 ROAD CENTERLINE ROAD SIGN SFM SFM SANITARY FORCEMAIN F� SANITARY CLEAN OUT ® SAN SAN SANITARY SEWER SAN SANITARY SEWER MAN HOLE 0 " �..••.• ����..,......:. .h << =.::.:... » »..��>< =? >�_ < => >I STORM SEWER sN SIAMESE CONNECTION TOPO MAJOR CONTOUR SIGN TOPO MINOR CONTOUR 0 SPRINKLER HEAD TR E E LI N E • • • • • • • • • • • • • • • • • • • (Q) STORM DRAIN MAN HOLE DO OHU OHU UTILITY OVERHEAD E TRAFFIC LIGHT POLE Fol U G U UGU UTILITY UNDER GROUND (T) TELEPHONE MAN HOLE OT W W WATERLINE W W TELEPHONE PEDESTAL -G� TELEPHONE POLE $ Z TELEPHONE JUNCTION BOX TP TEST PIT 6m 0 TRAFFIC CONTROL BOX Di� ❑� TRAFFIC JUNCTION BOX -1 0 TRAVERSE 0 0 UTILITY MARKER POST D UTILITY POLE COL) 0 VENT PIPE O �J WATER MAN HOLE OW WATER METER v WATER VALVE � WELL O YARD GRATE Im DELINEATED STREAM CHANNEL DELINEATED WETLANDS ® DESIGNED BY: PROJECT: B. F YANCEY ELEMENTARY SCHOOL SET REV. NO. Op DMJ WASTEWATER TREATMENT IMPROVEMENTS EROSION & SEDIMENT CONTROL PLAN 1 ENGINEERS DRAWN BY. ALBEMARLE COUNTY VIRGINIA SURVEYORS KTM DRAWING NUMBER: R I PLANNERS TITLE: ic No.,, DIHR BY: GENERAL NOTES, ABBREVIATIONS AND LEGEND EC -2 _� aka AsSOCIATES HFN 0 SHEET NUMBER: ��` Po Box 4119 3040 Avemore Square PI. WWA NUMBER: FILE NAME: DISCIPLINE. SCA ou LE: DATE: Lynchburg, VA 24502 Chadesvik, VA S om L Phone: 43-4.316.6080 Phone: 434.984.2700 300304C_ND1.dW CIVIL H: N/A 2 Of NO. SHEET REVISION BY DATE NO. SHEET REVISION BY DATE ti +� w�tw.wwassociates. net 213003.04 9 V. N/A 3113114 th 3t 'O 6 CJI 1* 0 PC) 0 0 14) cf) c 10 d: Q (1) It L'i 8 0O 0 n V_ C4 I-, q) �1*1 0 c �2 m n C) 0 W) V_ 04 .-I :z - � / / / I ( / I I I I � � \ , \, I \\ \ I \ / --- 2 ' � / I __ TMP I28A2-IGB - - I ' � ,_) '�' - I , / __ 2 ' " AG EE __ - . - - / TMF� � r __ ALAN K. AGEE __��R "l _ _ , j ( J� ,_, ( , _' _ 3N /I I 28A2 - i �__,, \\ DAVITA 1. -ACK',ON , . _� _J L I EUMAN(JEL & MAP`� C4RF_�/ // � ) , ,\, � 'I- 6 P 15.5 -\- - - I / / / ) D. B� - 2 B , 64 P � _11��� / " �l U R L ARE 'S - _� . '.. �(ZCB�1:52 I P. _�9,.-3 I , � ._---Z`ONED: RURAL AREAS __ __�_ 510 wmiim � I �_S 6 f_ _ E T, I ,l I R11 - - EA S I I � 0Z ID N _/ 'L / ,,R Al . I /1 USE: S N7,'IL 6 ,,,-- USE: RESIDENT,141:�--__ U S , I ,�E / / / 2c I I , I - , , , . / I I . I I / � �9 - - -TOP 128A�­17A / / -1, 68 - -- — -- - p ESTATES 1,or I / , I I " --- RALPH L. AND 4"ft 00 I I / '. / - � , 10 ' 1) ,� / �N -, - ROSA B. 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I/ ,� .., I �--)" ,�, � P , -, �, ., / / I (.��,_ __ l'i I , . ) I ,� - �_l I I , —, - I I — ,- I ] , Z,- I � � I , I i Line Table Line # Direction Length (ft) L N 39'28'06" W 39.83 L2 N 56'39'57" W I 35.23 L3 N 44'09'19" W 66.28 L4 N 53'37'41 " W 92.95 L5 N 52'35'29" W 4.19 L6 N 52'35'29" W 94.86 L7 N 58'23'08" W 100.12 L8 N 40° 12'3,3 " E 29_33 1 L9 I S 86-41'27" E 32.24 L 1 "' E 54.45 IF THIS DRAWING IS A REDUCTION GRAPHIC SCALE MUST BE USED SCALE: 1 " = 50' 50' 0 50' I *+♦## DESIGNED BY: PROJECT. Op P�� DMJ B. F. YANCEY ELEMENTARY SCHOOL SET REV. NO. � . ENGINEERS DRAWN BY. WASTEWATER TREATMENT IMPROVEMENTS EROSION & SEDIMENT CONTROL Pm 1 SURVEYORS k7m ALBEMARLE COUNTY, VIRGINIA DRAWING NUMBER: I - tc. . No. 225 1 DIHR BY. TITLE. EXISTING CONDITIONS EC-3 ,_ ; AsSOCIATES HFW I B I . 0� <:;, - 5(-/ X; rn PO Box 4119 3040 Aveore Squue Pl. SHEET NUMBER: - , Lynchburg, VA 24502 Chulm­ille, VA 229 11 WWA NUMBER: FILE NAME: DISCIPLINE: SCALE. DATE: Phone: 434.316.6080 Phone: 434.984.2700 213003.04 H: l'-sin' 3 of 1 1 �7'10NAL www.wwassociates.net 300304C-D(.dwg CIVIL U. Al 1A 3113114 NO. SHEET REVISION BY DATE NO. SHEET REVISION BY DATE 004#*+* 1 — pe) UI O O O V- C14 0 C4 I-- Em. TAl 128A-,-'- 15 HEIR OF MARY MONROE SCOTT 0 JOANNE SCOTT EDINGTON L 1).3 - `35 P. 2 12 ZONED' RURAL AREAS I-ISE: VACANT RESIDENTIAL LAN1,l 45 AC TMP I -128A2- 16B ALAN I(. AGES "OR ­ 2% DAVI TA 1,- _JA C-'KSON 10' iI 0.5�.--2864 P. 155 27ONED: RURAL AREAS_ 510- STORMWATER USE: RLSIDENDA-L'- 6" CRUSHER RUN CONVEYANCE -W (COMPACTED) -F I 128A2- 17A - - - CHANNEL RALPH L. AND -- PJ MOUiVIENT, ROSA B. HUDSON LIFE ESTATES D.B. '730 P. 19.3 FOUNIff RURAL AREAS COMPACTED 558* "JI4,41 "I; 5F-�S;7' TOTAL) V USE- RESIDENTIAL SOIL ­3 0-7' -- 7 ;11/ - I NOTE: 2 TMP 125A2-19 MGUA'E' ------ 196.97 -- ­ --T CONTRACTOR SHALL MAINTAIN ACCESS ROAD DURING MOUMENT LARRY HUDSON DETAIL ' FOUND D.B. 19J9 P. 450 ACCESS ROAD CONSTRUCTION. AFTER CONSTRUCTION, CONTRACTOR ZONED: RURAE'AREA5 0 NTS ;TMP J28A2 SHALL REPAIR ANY DAMAGE TO THE ACCESS ROAD, PL rY -Hn USE: VACANT " ,RESIDENTIAL - RESTORE THE GRAVEL SURFACE TO GOOD CONDITION, 'I " z AND VERIFY THAT THE GRAVEL HAS BEEN APPLIED TO OF ALSFI�JARL�E,, SC -0L BOARD �A�\PCr�� ELI � E/\rTAR� SCHOOL_---- ZONED: RURAL _AREAS,­ THE 6" THICKNESS AS SPECIFIED. ELEM11---j-T4R)� SCHOOL -4 7.02 14 A C P \'<... X o -0- )P --STREAM CHANNEL L ITS OE 10 �kIP il-8A2-2i 490 JAMES AND HELEN HUDSON C)OE ZONED ID.444 RURA P?A60 A -,AREAS V 5 °..7'E U - RESIDENTIAL \-z ooE ......... . XIMATE,.. 75.90 0 '� -'s __ APPRQ WETLANDS- '0'4 7'2 7 "E 10 &YR-_F�OODPL 0 'D T� 132.00' A"69. STREAM /CHANNEL LIMITS WETLANDS TMP 12 82 -23 , V SMITH, JOHN STA dWT IN C/O ROSE EDWARDS -�LBEMARLE COUNTY SCHOOL \BOA R�' TMP 128A2 22 59 X 461 P. 2�8 ZONED: RURAL AREAS -9,/ D.B. 4440 \,P. 746 1 -.1 - USE: RES1W --Z-qNED.- RURAb,,AREAS L CANT RESIDENTIAL LAND APPROXIMATE %,;. N 0 USE VA �A <e C \ 1� V S' 100YR FLOODPLAIN P,?)A 4 50 AC 'Al -7 1 "n" BATTING ZI I, G' WIRE SUPPORT P IPF SILT` LTI\ APPROXIMATE LOCATION NOTES: CAGE ­\ \ \ 3/0 FENCE Ab 1 THE EXISTING TRAILER WILL BE REMOVED BY ALBEMARLE COUNTY PUBLIC SCHOOLS. THE 50 100 'T. STREAM BUFFER CM0 "0 CONTRACTOR SHALL REMOVE THE SEPTIC TANK AND p- 1-- CLASS Al DRY (NV= 5 �­-) 3��' - -1 - I" -1�1' CXISTI NG SF OF 11, DRAINFIELD LIMITS OF CONSTRUCTION RIP RAP ON \ DRAINFIELD WITHIN THE LIMITS OF CONSTRUCTION. WOOD WIDE) CENTERED �EOTEXTILE \FABRIC SHED 30' NGTt6 LS RIGID LIP LI RED 2. THE DRIP FIELD AREA SHALL BE PREPARED AS ON UTILITY LE Z184 SToRNI LENGT-"20- FOLLOWS TO MINIMIZE DISTURBANCE TO THE EXISTING WIDTH=6 EE G DKPTH=O 69 SOIL. THICKNESS=2\ SF b t S LIMITS OFD DRIP FIELD -OP SF (INDICATES AREA �'�LOWER SIDE-SL Ej TOP TS �2NS�RUCTION/CLEARING -1-WIDTH=6' min. DI DC MU (SEE NOTE 2 le REMOVE STANDING TREES AND DOWNED TREES. hN D� PIC WIRE SUPPORTED � 7 �A GRA 'NG XQ I I TREES SHALL BE HAND CUT FLUSH TO GRADE. SILT FIE CE n 0) BOXES TMP 128A2- -RAKE THE SITE AND REMOVE ALL DEBRIS. JA Q) 7 1 SF FAME E. �PASSMORE D. B. 38 8 P. �93 *GRIND LARGE STUMPS (FROM TREES 6" AND INV=49 DOSING R AL ArEAS 7 TAN/� BELOW GROUND 1. LS EGETATED LIP USE: RE,51DENTAL ✓ LARGER IN DIAMETER) TO 8 , �: X10 ( ' ( O ' 20' WoODEN SURFACE. SMALLER STUMPS MAY BE GRUBBED. LID LENGTH=20' 0 DEPTH=0.51 CONCRETE LID ,\ �3 T� .�- =i\ \�� '., LOWER SID E� SLOPE WIDTH05f)" min./ 0 9 6?. ST- 1 Lj 71L TANK SEPT ❑ 'A DRAINAGE AREA 00 EX. CHAIN EX 58 11 lb/ '0 -X -T. D(ACLU =2.12 AC 11 1 1plli� FENCE SiE .91.5 DES CC -1� DA) �-j D MU r LID 22.1' HB 13vFT. WIDE WEIR 6c AL 00-0 FO? � -,q 0 / " , --� 7� i 7(1, MISCELLANEOUS 9.§ LF EROSION AND SEDIMENT CONTROL LEGEND f I OF� 24" OF CLEAN OUT HD�E 05.0% WEIR=493 W�' ,r o0" TEMPORARY STONE Ek. -o CREST 'ASPHALT -1 0\ NEW OT WEIK=-495 CONSTRUCTION SZT �b. -1 97.00' ENTRANCE CE WALK AERIAL SURVEY CONTROL POINT 105 16 ST-1 '(ANCEY ELEV=', 32.08 ELEMENTARY SCHOOL PE N 382-?52 7. 1620 I B. F, I 1\ ✓ � / / I k 7 Tc P SILT FENCE X- X 7625 PORTERS ROAD 114!,5115.00'(� INV=§01 0' \,,o TO �ATH X X (CHANNEL FLOW) I !?0 Tc PATH (SHALLO"ONC. FLjW) 3.08 CULVERT INLET ALL PROTECTION CIP CO- )A B�RM FLAG'PULL D INA �)A� AC DA=51 04 5) �_ C n ' Q-=-0.50 0- :5 Tc:Flf�3/rnin.) )(C3 BLDG. H P'� L . EXIST DRAI AG AREA QITC 7 0 ,ETC BENCHMARK F,)UND y 1. )� - '?) -\-\ IPA -TS M CHISE�ED SQUARE N L F -711- (C 7/-' CORNER OF DI -I- I el. ELEV=528.8 I DC Hoop MU P EXISTING Q- V- PARKING IRF 9 —-EXISTING P) 'YE I DROP - \ L✓1 k<ELC o 3 T- _SWM EXISTING 0 / // FIP M -T LEVEL SPREA0 �brf E T, n H 508 (OHE 'S7- 0 _71 �7 f 7 L4 X L,D L&W--HANQNG OHE --4R/FW- W EARANCE 0.5'+ CLL our ftftw - - -­71 A Q' -4 0 62 UMMM -17 77 W --7TI- ,mom EMEMM T PLE 77 613 nn Culvert Drainage Area Tc Summary Sheet Flow (A->B) (Seelye Method) Shallow Conc. Flow (B-->C) Channel Flow (C->End) Total Time (min.) Length (ft.) 211 Length (ft) 241 Length (ft) 675 Slope (ft/ft) 0.040 Slope 4.2% Height (ft) 27 C Value 0.35 Surface Unpaved Travel time based on Kirpich Nomograph. 16.7 11.3 Velocity (ffis) 3.2 Tc (min.). 11.2 To (min.) j 1.3 Tc (min.) j 4.3 0.3 SCC-1 Drainage Area Tc Summary AREA, EOICATED -411, 1 M- j Channel Flow (C->End) Total Time (min.) _J pt.5v(�'- D -8 Uo-' D > A3 �b- SCC-1 Drainage Area Tc Summary Sheet Flow (A->B) (Seelye Method) Shallow Conc. Flow (B->C) Channel Flow (C->End) Total Time (min.) Length (ft.) 180 Length (ft) 40 Length (ft) l 20 Slope (ft/ft) 0.075 Slope Mo% Height (ft) l I C Value 0.30 Surface Unpaved Travel time based on Kirpich Nomograph. 11.3 Velocity (ft/s) 5.1 L Tc (min.), 10.9 To (min-), 0.1 Tc (min.) 0.3 EX�STING ENTRANCE V 0 H Ir S Ik IPSON 13 N(jHMARK FOUND X0'- SIMPSON PARK ILROAD SPI,f�E IN RA POWER POLE PARK EL EV=5 16.25 4- y � ;--c ;C- 1 vl 0 Hi VHE-- C Tc PATH (SHEE"r,\ FLOW) j Scc- 1 DRAINAGE AREA DA=0.78 AC C=0.40 Tc=1 1.3 min. EXISTING TRAILER (SEE NOTE 1) IF THIS DRAWING IS A REDUCTION GRAPHIC SCALE MUST BE USED SCALE: 1 50' 0 E E 50' 0 50' TEMPORARY DD O DIVERSION DIKE TEMPORARY SEDIMENT TRAP STORMWATER CONVEYANCE CHANNEL OUTLET PROTECTION LEVEL SPREADER LS TOPSOILING TEMPORARY SEEDING PERMANENT SEEDING MULCHING SOIL STABILIZATION BLANKETS & MATTING DUST CONTROL 1 REVISED CULVERT, GRADING, AND CLEARING LIMITS SAR 5-8-14 DESIGNED BY: PROJECT: B. F. YANCEY ELEMENTARY SCHOOL SET REV. NO. OP DMJ WASTEWATER TREATMENT IMPROVEMENTS EROSION & SEDIMENT CONTROL PLAN ENGINEERS Df?AWN BY. SURVEYORS KTM TITLE: ALBEMARLE COUNTY, VIRGINIA DRAWING NUMBER: 1c, o, 1225 PLANNERS DIHR BY. EROSION AND SEDIMENT CONTROL PLAN - 5(-/ �/ ASSOCIATES HFW SHEET NUMBER: 0 F0 Box 4119 3040 Avernore Square P1. ID Lynchburg, VA 24502 Ch,al.U­itle, VA 22911 WWA NUMBER: FILE NAME: DISCIPLINE: SCALE. DATE: �7-'ONAL Phone: 434.316.6080 Phone: 434.984.2700 CIVIL H: 1 `---50' NO. SHEET REVISION BY DATE NO. SHEET REVISION BY DATE www.wwllssocitttes.net 213003.04 300304C-SP1.dwg V. NIA 3113114 1 4 of 11 Im 3 v 0 W UI 0 0 / c 0 o. U W �F O O O M 04 U a m 0 N / E? EROSION & SEDIMENT CONTROL NARRATIVE I. PROJECT DESCRIPTION IT IS THE INTENT OF THIS PLAN TO PERFORM THE CLEARING, GRADING, AND CONSTRUCTION OF AN ACCESS ROAD AND STORMWATER MANAGEMENT (SWM) FACILITY FOR A PACKAGE TYPE WASTEWATER TREATMENT FACILITY THAT WILL SERVE THE B.F. YANCY ELEMENTARY SCHOOL IN ALBEMARLE COUNTY, VIRGINIA. THIS PROJECT WILL INVOLVE DISTURBING APPROXIMATELY 1.93 ACRES. II. EXISTING SITE CONDITIONS THE SITE IS LOCATED ON PROPERTY THAT INCLUDES THE EXISTING B.F. YANCEY ELEMENTARY AND THE ADJACENT PARCELS DIRECTLY EAST AND WEST OF THE SCHOOL. THE SITE OF THE PACKAGE TYPE WASTEWATER TREATMENT PLANT IS PRIMARILY FORESTED. THE SITE RECEIVES DRAINAGE FROM THE SURROUNDING FOREST, PORTIONS OF B.F. YANCEY ELEMENTARY SCHOOL, AND PORTIONS OF PORTERS ROAD. III. ADJACENT PROPERTIES THE SITE IS BOUNDED TO THE NORTHWEST BY B.F. YANCY ELEMENTARY SCHOOL, TO THE NORTHEAST BY AN UNNAMED TRIBUTARY TO ROCKCASTLE CREEK, TO THE SOUTHEAST BY RESIDENTIAL PROPERTY, AND THE TO SOUTHWEST BY PORTERS ROAD. IV. OFF -SITE AREAS THERE WILL BE NO OFF -SITE ACTIVITIES. V. SOILS ACCORDING TO THE USDA SCS SOIL MAPING, THE DISTURBED AREAS WITHIN THE PROJECT LIES ON THE FOLLOWING SOIL TYPES: CULLEN LOAM (196): OCCURS ON 2 TO 7 PERCENT SLOPES. HYDROLOGIC SOIL GROUP B WITH A K- FACTOR OF 0.24. CULLEN CLAY LOAM (20C3): OCCURS ON 7 TO 15 PERCENT SLOPES. HYDROLOGIC SOIL GROUP B WITH A K- FACTOR OF 0.17. MANTEO CHANNERY SILT LOAM (51D): OCCURS ON 15 TO 25 PERCENT SLOPES. HYDROLOGIC SOIL GROUP D WITH A K- FACTOR OF 0.20. NASON SILT LOAM (62C): OCCURS ON 7 TO 15 PERCENT SLOPES. HYDROLOGIC SOIL GROUP B WITH A K- FACTOR OF 0.37 NASON SILT LOAM (62D): OCCURS ON 15 TO 25 PERCENT SLOPES. HYDROLOGIC SOIL GROUP B WITH A K- FACTOR OF 0.37. TATUM SILT LOAM (80B): OCCURS ON 2 TO 7 PERCENT SLOPES. HYDROLOGIC SOIL GROUP B WITH A K- FACTOR OF 0.37. TATUM SILT LOAM (80C): OCCURS ON 7 TO 15 PERCENT SLOPES. HYDROLOGIC SOIL GROUP B WITH A K- FACTOR OF 0.37. WORSHAM LOAM (9613): OCCURS ON 2 TO 7 PERCENT SLOPES. HYDROLOGIC SOIL GROUP D WITH A K- FACTOR OF 0.37. UDORTHENTS LOAMY (88): THIS MAP UNIT IS MADE UP OF AREAS THAT HAVE BEEN CUT OR FILLED DUE TO CONSTRUCTION. NO REPORTED HYDROLOGIC SOIL GROUP OR K- FACTOR RATING. VI. CRITICAL AREAS CARE SHALL BE TAKEN TO STABILIZE ALL SLOPES AND PREVENT EROSION. CARE SHALL ALSO BE TAKEN TO MINIMIZE THE TRANSPORT OF SEDIMENT ONTO PORTERS (STATE ROUTE 627) OR THROUGH THE SCHOOL PROPERTY. VII. STORMWATER MANAGEMENT CONSIDERATIONS STORMWATER MANAGEMENT FOR THE ADDITIONAL IMPERVIOUS AREAS WILL BE PROVIDED. AN EXTENDED DETENTION BASIN PROVIDES BOTH WATER QUANTITY ATTENUATION FOR THE PROPOSED IMPROVMENTS FOR THE 2 -YR AND 10 -YR STORM EVENTS AND WATER QUALITY POLLUTANT REMOVAL FOR THE PROPOSED IMPROVEMENTS. VIII. OFF -SITE ACTIVITIES THERE WILL BE NO OFF -SITE ACTIVITIES. IX. EROSION AND SEDIMENT CONTROL MEASURES ALL VEGETATIVE AND STRUCTURAL EROSION AND SEDIMENT CONTROL PRACTICES SHALL BE CONSTRUCTED AND MAINTAINED BY THE CONTRACTOR IN ACCORDANCE WITH THE LATEST EDITION OF THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK. SYMBOLS, DETAILS, AND DIMENSIONS USED ARE TAKEN FROM THE HANDBOOK, AS WELL AS THE VIRGINIA DEPARTMENT OF TRANSPORTATION'S ROAD AND BRIDGE STANDARDS, VOLUME I, 2008. A. STRUCTURAL PRACTICES 1. TEMPORARY CONSTRUCTION ENTRANCE (CE), 3.02: TEMPORARY CONSTRUCTION ENTRANCES SHALL BE IN ACCORDANCE WITH THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK TO PREVENT THE TRANSPORT OF SEDIMENT ONTO ROADWAYS BY CONSTRUCTION TRAFFIC. 2. SILT FENCE (SF), 3.05: SILT FENCE BARRIERS SHALL BE INSTALLED DOWN SLOPE OF DISTURBED AREAS WITH TO FILTER RUNOFF FROM SHEET FLOW AS INDICATED ON THE SITE PLAN. 3. CULVERT INLET PROTECTION (CP), 3.08: CULVERT INLET PROTECTION SHALL BE PROVIDED AS SHOWN ON THE PLANS TO PREVENT SEDIMENT FROM ENTERING AND DEPOSITING IN THE CULVERT. 4. TEMPORARY DIVERSION DIKE (DD), 3.09: PROVIDE DIVERSION DIKES AS SHOWN ON THE PLAN TO DIRECT SEDIMENT LADEN WATER INTO THE SEDIMENT TRAP. 5. TEMPORARY SEDIMENT TRAP (SB), 3.13: CONSTRUCT AS SHOWN ON THE PLAN TO DETAIN SEDIMENT -LADEN RUNOFF FROM DISTURBED AREAS IN "WET" AND "DRY" STORAGE LONG ENOUGH FOR THE MAJORITY OF THE SEDIMENT TO SETTLE OUT. 6. STORMWATER CONVEYANCE CHANNEL (SCC), 3.17: INSTALL AS SHOWN ON PLAN TO CONVEY CONCENTRATED STORMWATER RUNOFF TO A RECEIVING CHANNEL OR SYSTEM WITHOUT CAUSING EROSION. 7. OUTLET PROTECTION (OP), 3.18: INSTALL AT OUTFALLS AS SHOWN ON PLANS TO PREVENT SCOUR AND MINIMIZE DOWNSTREAM EROSION. 8. LEVEL SPREADER (LS) 3.21: CONSTRUCT WHERE SHOWN ON THE PLANS TO CONVERT CONCENTRATED FLOW INTO SHEET FLOW. 9. SOIL STABILIZATION BLANKETS & MATTING (B /M), 3.36: INSTALL AS SHOWN ON PLAN TO RESIST EROSION AND PROMOTE THE ESTABLISHMENT OF YOUNG VEGETATION IN CHANNELIZED AREAS. 10. DUST CONTROL (DC), 3.39: PROVIDE DUST CONTROL AS SHOWN ON PLANS TO HELP REDUCE THE PRESENCE OF AIRBORNE SEDIMENT DURING LAND DISTURBING ACTIVITIES. B. VEGETATIVE PRACTICES 1. TOP SOILING & STOCKPILING (TO), 3.30: TOPSOIL WILL BE STRIPPED FROM AREAS TO BE GRADED AND STOCKPILED FOR LATER USE. STOCKPILES ARE TO BE STABILIZED WITH TEMPORARY VEGETATION AND HAVE SILT FENCE INSTALLED ALONG THE LOWER PERIMETER. STOCKPILES SHALL BE LOCATED AS SHOWN ON THE PLANS. 2. REFER TO "ALBEMARLE COUNTY GENERAL CONSTRUCTION NOTES FOR EROSION AND SEDIMENT CONTROL PLANS" #17 AND #18 AND TO "TEMPORARY & PERMANENT SEEDING SCHEDULE 3.32 -D" ON DRAWING NUMBER EC -6 FOR ADDITIONAL INFORMATION. C. MINIMUM STANDARDS MS -1. STABILIZATION OF DENUDED AREAS: PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN 7 DAYS AFTER FINAL GRADE IS REACHED ON ANY PORTION OF THE SITE. TEMPORARY SOIL STABILIZATION SHALL BE APPLIED WITHIN 7 DAYS TO DENUDED AREAS THAT MAY NOT BE AT FINAL GRADE, BUT WILL REMAIN DORMANT OR UNDISTURBED FOR LONGER THAN 30 DAYS. PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR MORE THAN ONE YEAR. MS -2. STABILIZATION OF SOIL STOCKPILES: DURING CONSTRUCTION OF THE PROJECT, SOIL STOCKPILES AND BORROW AREAS SHALL BE STABILIZED OR PROTECTED WITH SEDIMENT TRAPPING MEASURES. THE APPLICANT IS RESPONSIBLE FOR TEMPORARY PROTECTION AND PERMANENT STABILIZATION OF ALL STOCKPILES ON SITE AS WELL AS BORROW AREAS AND SOIL INTENTIONALLY TRANSPORTED FROM THE PROJECT SITE. MS -3. PERMANENT VEGETATIVE COVER: A PERMANENT VEGETATIVE COVER SHALL BE ESTABLISHED ON DENUDED AREAS NOT OTHERWISE PERMANENTLY STABILIZED. PERMANENT VEGETATION SHALL NOT BE CONSIDERED ESTABLISHED UNTIL A GROUND COVER IS ACHIEVED THAT, IN THE OPINION OF THE E &S INSPECTOR, IS UNIFORM AND MATURE ENOUGH TO SURVIVE AND INHIBIT EROSION. MS -4. TIMING AND STABILIZATION OF SILT TRAPPING MEASURES: SEDIMENT BASINS AND TRAPS, STORM INLET PROTECTION, SILT FENCING, AND OTHER MEASURES INTENDED TO TRAP SEDIMENT SHALL BE CONSTRUCTED AS A FIRST STEP IN ANY LAND DISTURBING ACTIVITY AND SHALL BE MADE FUNCTIONAL BEFORE UPSLOPE LAND DISTURBANCE TAKES PLACE. MS -5. STABILIZATION OF EARTHEN STRUCTURES: STABILIZATION MEASURES SHALL BE APPLIED TO EARTHEN STRUCTURES SUCH AS DAMS, DIKES AND DIVERSIONS IMMEDIATELY AFTER INSTALLATION. MS -6. SEDIMENT BASINS AND TRAPS: SEDIMENT TRAPS & BASINS SHALL BE CONSTRUCTED BASED UPON THE TOTAL DRAINAGE AREA TO BE SERVED. A. THE MINIMUM CAPACITY OF A SEDIMENT TRAP SHALL BE 134 -CUBIC YARDS PER ACRE OF DRAINAGE AREA, AND SHALL CONTROL A DRAINAGE AREA OF LESS THAN 3- ACRES. B. THE MINIMUM CAPACITY OF A SEDIMENT BASIN SHALL BE 134 -CUBIC YARDS PER ACRE OF DRAINAGE AREA, AND SHALL CONTROL A DRAINAGE AREA OF 3 -ACRES OR GREATER. MS -7. CUT AND FILL SLOPES: CUT AND FILL SLOPES SHALL BE CONSTRUCTED IN A MANNER THAT WILL MINIMIZE EROSION. SLOPES THAT ARE FOUND TO BE ERODING EXCESSIVELY WITHIN ONE YEAR OF PERMANENT STABILIZATION SHALL BE PROVIDED WITH ADDITIONAL SLOPE STABILIZING MEASURES UNTIL THE PROBLEM IS CORRECTED. MS -8. CONCENTRATED RUNOFF DOWN CUT OR FILL SLOPES: CONCENTRATED RUNOFF SHALL NOT FLOW DOWN CUT OR FILL SLOPES UNLESS CONTAINED WITHIN AN ADEQUATE TEMPORARY OR PERMANENT CHANNEL, FLUME OR SLOPE DRAIN STRUCTURE. MS -9. WATER SEEPAGE FROM A SLOPE FACE: WHENEVER WATER SEEPS FROM A SLOPE FACE, ADEQUATE DRAINAGE OR OTHER PROTECTION SHALL BE PROVIDED. MS -10. STORM SEWER INLET PROTECTION: ALL STORM SEWER INLETS THAT ARE MADE OPERABLE DURING CONSTRUCTION SHALL BE PROTECTED SO THAT SEDIMENT -LADEN WATER CANNOT ENTER THE CONVEYANCE SYSTEM WITHOUT FIRST BEING FILTERED OR OTHERWISE TREATED TO REMOVE SEDIMENT. MS -11. STABILIZATION OF OUTLETS: BEFORE NEWLY CONSTRUCTED STORM WATER CONVEYANCE CHANNELS OR PIPES ARE MADE OPERATIONAL, ADEQUATE OUTLET PROTECTION AND ANY REQUIRED TEMPORARY OR PERMANENT CHANNEL LINING SHALL BE INSTALLED IN BOTH THE CONVEYANCE CHANNEL AND RECEIVING CHANNEL. MS -12. WORK IN LIVE WATERCOURSES: WHEN WORK IN A LIVE WATERCOURSE IS PERFORMED, PRECAUTIONS SHALL BE TAKEN TO MINIMIZE ENCROACHMENT, CONTROL SEDIMENT TRANSPORT AND STABILIZE THE WORK AREA TO THE GREATEST EXTENT POSSIBLE DURING CONSTRUCTION. NONERODIBLE MATERIAL SHALL BE USED FOR THE CONSTRUCTION OF CAUSEWAYS AND COFFERDAMS. EARTHEN FILL MAY BE USED FOR THESE STRUCTURES IF ARMORED BY NONERODIBLE COVER MATERIALS. MS -13. CROSSING A LIVE WATERCOURSE: WHEN A LIVE WATERCOURSE MUST BE CROSSED BY CONSTRUCTION VEHICLES MORE THAN TWICE IN ANY SIX MONTH PERIOD, A TEMPORARY VEHICULAR STREAM CROSSING CONSTRUCTED OF NONERODIBLE MATERIALS SHALL BE PROVIDED. MS -14. APPLICABLE REGULATIONS: ALL APPLICABLE FEDERAL, STATE AND LOCAL REGULATIONS PERTAINING TO WORKING IN OR CROSSING LIVE WATERCOURSES SHALL BE MET. MS -15. STABILIZATION OF BED AND BANKS: N/A THE BED AND BANKS OF A WATERCOURSE SHALL BE STABILIZED IMMEDIATELY AFTER WORK IN THE WATERCOURSE IS COMPLETED. MS -16. UNDERGROUND UTILITIES: UNDERGROUND UTILITY LINES SHALL BE INSTALLED IN ACCORDANCE WITH THE FOLLOWING STANDARDS, IN ADDITION TO OTHER APPLICABLE CRITERIA: A. NO MORE THAN 500 - LINEAR FEET OF TRENCH MAY BE OPENED AT ONE TIME. B. WHERE CONSISTENT WITH SAFETY AND SPACE CONSIDERATIONS, EXCAVATED MATERIAL IS TO BE PLACED ON THE UPHILL SIDE OF TRENCHES, EXCEPT FOR ANY DIVERSION DITCHES. C. EFFLUENT FROM DEWATERING OPERATIONS SHALL BE FILTERED OR PASSED THROUGH AN APPROVED SEDIMENT TRAPPING DEVICE, OR BOTH, AND DISCHARGED IN A MANNER THAT DOES NOT ADVERSELY AFFECT FLOWING STREAMS OR OFFSITE PROPERTY. D. TRENCH BACKFILL MATERIAL SHALL BE PROPERLY COMPACTED IN ORDER TO MINIMIZE EROSION AND PROMOTE STABILIZATION. E. RESTABILIZATION SHALL BE ACCOMPLISHED IN ACCORDANCE WITH THESE REGULATIONS. F. ALL APPLICABLE SAFETY REGULATIONS SHALL BE COMPLIED WITH AT ALL TIMES. MS -17. CONSTRUCTION ACCESS ROUTES: WHERE CONSTRUCTION VEHICLE ACCESS ROUTES INTERSECT PAVED OR PUBLIC ROADS, PROVISIONS SHALL BE MADE TO MINIMIZE THE TRANSPORT OF SEDIMENT BY VEHICULAR TRACKING ONTO THE PAVED SURFACE. WHERE SEDIMENT IS TRANSPORTED ONTO A PAVED OR PUBLIC ROAD, THE ROAD SURFACE SHALL BE CLEANED THOROUGHLY AT THE END OF EACH DAY. SEDIMENT SHALL BE REMOVED BY SHOVELING OR SWEEPING AND TRANSPORTED TO A SEDIMENT DISPOSAL AREA. STREET WASHING SHALL BE ALLOWED ONLY AFTER SEDIMENT IS REMOVED IN THIS MANNER. THIS PROVISION SHALL APPLY TO INDIVIDUAL DEVELOPMENT LOTS AS WELL AS TO LARGER LAND- DISTURBING ACTIVITIES. MS -18. TEMPORARY E &S CONTROL MEASURE REMOVAL: ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES SHALL BE REMOVED WITHIN 30 DAYS AFTER FINAL SITE STABILIZATION OR AFTER TEMPORARY MEASURES ARE NO LONGER NEEDED, UNLESS OTHERWISE AUTHORIZED BY THE LOCAL E &S AUTHORITY. TRAPPED SEDIMENT AND THE DISTURBED SOIL AREAS RESULTING FROM THE DISPOSITION OF TEMPORARY MEASURES SHALL BE PERMANENTLY STABILIZED TO PREVENT FURTHER EROSION AND SEDIMENTATION. MS -19. ADEQUACY OF RECEIVING CHANNELS: PROPERTIES AND WATERWAYS DOWNSTREAM FROM THE DEVELOPMENT SITE SHALL BE PROTECTED FROM SEDIMENT DEPOSITION, EROSION AND DAMAGE DUE TO INCREASES IN VOLUME, VELOCITY AND PEAK FLOW RATES OF STORM WATER RUNOFF FOR THE STATED FREQUENCY STORM OF 24 -HOUR DURATION. D. MAINTENANCE: ALL EROSION AND SEDIMENT CONTROL STRUCTURES AND SYSTEMS SHALL BE MAINTAINED, INSPECTED, AND REPAIRED AS NEEDED TO INSURE CONTINUED PERFORMANCE OF THEIR INTENDED FUNCTION. ALL EROSION AND SEDIMENT CONTROL MEASURES SHALL BE CHECKED AT THE END OF EACH DAY AND AFTER EVERY RAINFALL EVENT. 1. DAMAGE TO EROSION CONTROL MEASURES CAUSED BY CONSTRUCTION TRAFFIC OR OTHER ACTIVITY SHALL BE REPAIRED BEFORE THE END OF EACH WORKING DAY. 2. MAINTAIN ALL SEEDED AREAS UNTIL A UNIFORM STAND IS ACCEPTED. 3. CONSTRUCTION ENTRANCE (3.02): PROVIDE FOR EQUIPMENT WASHING AS NEEDED TO PREVENT THE TRANSPORT OF SOIL ONTO EXISTING ASPHALT ROADWAYS. ANY SEDIMENT ON THE PAVEMENT SHALL BE REMOVED IMMEDIATELY. 4. SILT FENCE (3.05): SILT FENCE BARRIERS WILL BE CHECKED DAILY FOR UNDERMINING OR DETERIORATION OF THE FABRIC. SEDIMENT SHALL BE REMOVED WHEN THE LEVEL REACHES HALF WAY TO THE TOP OF THE BARRIER. 5. CULVERT INLET PROTECTION (3.07): SHALL BE INSPECTED AFTER EACH RAIN AND REPAIRS MADE AS NEEDED. 5. TEMPORARY DIVERSION DIKE (3.09): SHALL BE INSPECTED FOR EROSION AFTER EACH RAIN AND REPAIRS MADE AS NEEDED. 6. TEMPORARY SEDIMENT TRAP (3.13): SEDIMENT SHALL BE REMOVED AND THE TRAP RESTORED TO ITS ORIGINAL DIMENSIONS WHEN SEDIMENT HAS ACCUMULATED TO ONE HALF THE DESIGN VOLUME OF THE WET STORAGE. SEDIMENT REMOVAL FROM THE BASIN SHALL BE DEPOSITED IN A SUITABLE AREA AND IN SUCH A MANNER THAT IT WILL NOT ERODE AND CAUSE SEDIMENTATION PROBLEMS. FILTER STONE SHALL BE REGULARLY CHECKED TO ENSURE THAT FILTRATION PERFORMANCE IS MAINTAINED. STONE CHOKED WITH SEDIMENT SHALL BE REMOVED AND CLEANED OR REPLACED. 7. STORMWATER CONVEYANCE CHANNELS (3.17): THE MEASURE SHALL BE CHECKED PERIODICALLY TO ENSURE THAT SCOUR IS NOT OCCURRING. SEDIMENT DEPOSITED IN THE CHANNELS SHALL BE REMOVED PRIOR TO THE REMOVAL OF THE TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES, AND DURING CONSTRUCTION WHEN THE CAPACITY OF THE CHANNELS IS REDUCED. 8. OUTLET PROTECTION (3.18): INSPECT AFTER RAINFALL EVENTS TO CHECK FOR SCOUR. 9. LEVEL SPREADER (3.21): SHALL BE CHECKED AFTER EACH RAIN EVENT TO ENSURE THAT SCOUR IS NOT OCCURRING AND THAT SPREADER IS FUNCTIONING AS INTENDED. MAKE REPAIRS TO DAMAGES IMMEDIATELY AND RE- STABILIZE THE STRUCTURE. 10. SEEDING (3.31/ 3.32): AREAS WHICH FAIL TO ESTABLISH VEGETATIVE COVER ADEQUATE TO PREVENT RILL EROSION WILL BE RESEEDED AS SOON AS SUCH AREAS ARE IDENTIFIED. 11. SOIL STABILIZATION BLANKETS & MATTING (3.36): THE MEASURE SHALL BE PERIODICALLY CHECKED FOR UNDERMINING AND TO ENSURE THAT IT IS SECURE AND FUNCTIONING AS INTENDED. 12. DUST CONTROL (3.39): PROVIDE DUST CONTROL IN AREAS SUBJECT TO SURFACE AND AIR MOVEMENT OF DUST WHERE ON -SITE AND OFF -SITE DAMAGE IS LIKELY TO OCCUR IF PREVENTIVE MEASURES ARE NOT TAKEN. ALBEMARLE COUNTY GENERAL CONSTRUCTION NOTES FOR EROSION AND SEDIMENT CONTROL PLANS 1. 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. 2. ALL EROSION AND SEDIMENT CONTROL MEASURES WILL BE CONSTRUCTED AND MAINTAINED ACCORDING TO MINIMUM STANDARDS AND SPECIFICATION OF THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK AND VIRGINIA REGULATIONS VR 625 -02 -00 EROSION AND CONTROL SEDIMENT REGULATIONS. 3. ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR TO OR AS THE FIRST STEP IN CLEARING. 4. A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL PLAN SHALL BE MAINTAINED ON THE SITE AT ALL TIMES. 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 APPROVING AUTHORITY. 6. THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY ADDITIONAL EROSION CONTROL MEASURES NECESSARY TO PREVENT EROSION AND SEDIMENTATION AS DETERMINED BY THE PLAN APPROVING AUTHORITY. 7. ALL DISTURBED AREAS ARE TO DRAIN TO APPROVED SEDIMENT CONTROL MEASURES AT ALL TIMES DURING LAND DISTURBING ACTIVITIES AND DURING SITE DEVELOPMENT UNTIL FINAL STABILIZATION IS ACHIEVED. 8. DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN APPROVED FILTERING DEVICE. 9. THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES PERIODICALLY AND AFTER EACH RUNOFF - PRODUCING RAINFALL EVENT. ANY NECESSARY REPAIRS FOR CLEANUP TO MAINTAIN THE EFFECTIVENESS OF THE EROSION CONTROL DEVICES SHALL BE MADE IMMEDIATELY. 10. ALL FILL MATERIAL TO BE TAKEN FROM AN APPROVED, DESIGNATED BORROW AREA. 11. ALL WASTE MATERIALS SHALL BE TAKEN TO AN APPROVED WASTE AREA. EARTH FILL SHALL BE INERT MATERIALS ONLY, FREE OF ROOTS, STUMPS, WOOD, RUBBISH, AND OTHER DEBRIS. 12. BORROW OR WASTE AREAS ARE TO BE RECLAIMED WITHIN 7 DAYS OF COMPLETION PER ZONING ORDINANCE SECTION 5.1.28. 13. ALL INERT MATERIALS SHALL BE TRANSPORTED TO COMPLIANCE WITH SECTION 13 -301 OR THE CODE OF ALBEMARLE. 14. BORROW, FILL OR WASTE ACTIVITY INVOLVING INDUSTRIAL -TYPE POWER EQUIPMENT SHALL BE LIMITED TO THE HOURS OF 7:OOA.M. TO 9:00 P.M. 15. BORROW, FILL OR WASTE ACTIVITY SHALL BE CONDUCTED IN A SAFE MANNER THAT MAINTAINS LATERAL SUPPORT, IN ORDER TO MINIMIZE ANY HAZARD TO PERSONS, PHYSICAL DAMAGE TO ADJACENT LAND AND IMPROVEMENTS, AND DAMAGE TO ANY PUBLIC STREET BECAUSE OF SLIDES, SINKING, OR COLLAPSE. 16. THE DEVELOPER SHALL RESERVE THE RIGHT TO INSTALL, MAINTAIN, REMOVE OR CONVERT TO PERMANENT STORMWATER MANAGEMENT FACILITIES WHERE APPLICABLE ALL EROSION CONTROL MEASURES REQUIRED BY THIS PLAN REGARDLESS OF THE SALE OF ANY LOT, UNIT, BUILDING OR OTHER PORTION OF THE PROPERTY. 17. TEMPORARY STABILIZATION SHALL BE TEMPORARY SEEDING AND MULCHING. SEEDING IS TO BE AT 75 LBS /ACRE, AND IN THE MONTHS OF SEPTEMBER TO FEBRUARY TO CONSIST OF 50/50 MIX OF ANNUAL RYEGRASS AND CEREAL WINTER RYE, OR IN MARCH AND APRIL TO CONSIST OF ANNUAL RYE, OR MAY THROUGH AUGUST TO CONSIST OF GERMAN MILLET. STRAW MULCH TO BE APPLIED AT 80LBS /100SF. ALTERNATIVES ARE SUBJECT TO APPROVAL BY THE COUNTY EROSION CONTROL INSPECTOR. 18. PERMANENT STABILIZATION SHALL BE LIME AND FERTILIZER, PERMANENT SEEDING, AND MULCH. AGRICULTURAL GRADE LIMESTONE SHALL BE APPLIED AT 90LBS /1000SF, INCORPORATED INTO THE TOP 4 -6 INCHES OF SOIL. FERTILIZER SHALL BE APPLIED AT 1000LBS /ACRE AND CONSIST OF A 10 -20 -10 NUTRIENT MIX. PERMANENT SEEDING SHALL BE APPLIED AT 180LBS /ACRE AND CONSIST OF 95% KENTUCKY 31 OR TALL FESCUE AND 0 -5% PERENNIAL RYEGRASS OR KENTUCKY BLUEGRASS. STRAW MULCH IS TO BE APPLIED AT 80LBS /1000SF. ALTERNATIVES ARE SUBJECT TO APPROVAL BY THE COUNTY EROSION CONTROL INSPECTOR. 19. MAINTENANCE: ALL MEASURES ARE TO BE INSPECTED WEEKLY AND AFTER EACH RAINFALL. ANY DAMAGE OR CLOGGING TO STRUCTURAL MEASURES IS TO BE REPAIRED IMMEDIATELY. SILT TRAPS ARE TO BE CLEANED WHEN 50% OF THE WET STORAGE VOLUME IS FILLED WITH SEDIMENT. ALL SEEDED AREAS ARE TO BE RESEEDED WHEN NECESSARY TO ACHIEVE A GOOD STAND OF GRASS. SILT FENCE AND DIVERSION DYKES WHICH ARE COLLECTING SEDIMENT TO HALF THEIR HEIGHT MUST BE CLEANED AND REPAIRED IMMEDIATELY. 20. ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE REMOVED WITHIN 30 DAYS OF FINAL SITE STABILIZATION, WHEN MEASURES ARE NO LONGER NEEDED, SUBJECT TO APPROVAL BY THE COUNTY EROSION CONTROL INSPECTOR. 21. THIS PLAN SHALL BE VOID IF THE OWNER DOES NOT OBTAIN A PERMIT WITHIN 1 YEAR OF THE DATE OF APPROVAL. (WATER PROTECTION ORDINANCE SECTION 17- 204G). 22. PERMANENT VEGETATION SHALL BE INSTALLED ON ALL DENUDED AREAS WITHIN NINE (9) MONTHS AFTER THE DATE THE LAND DISTURBING ACTIVITY COMMENCED. (WATER PROTECTION ORDINANCE SECTION 17- 207B). SEQUENCE OF CONSTRUCTION 1. CONTRACTOR TO SCHEDULE AND ATTEND A PRE - CONSTRUCTION MEETING WITH ALBEMARLE COUNTY AND OBTAIN ALBEMARLE COUNTY LAND DISTURBANCE PERMIT PRIOR TO THE START OF ANY LAND DISTURBING/ CONSTRUCTION ACTIVITIES ASSOCIATED WITH THIS PLAN. 2. INSTALL CONSTRUCTION ENTRANCE, AND SILT FENCE PERIMETER CONTROL. 3. CLEAR AND GRUB TREES AS NECESSARY TO INSTALL CULVERT. INSTALL CULVERT WITH INLET AND OUTLET PROTECTION TO DIVERT DRAINAGE FROM THE SCHOOL AND PORTERS ROAD AROUND THE SITE. 4. INSTALL SEDIMENT TRAP. 5. CLEAR TREES AS NECESSARY TO INSTALL ACCESS ROAD AND SCC -1. GRADE SITE AS SHOWN ON THE PLANS. 6. CLEAR AND GRUB REMAINING TREES. DO NOT GRUB TREES WITHIN DRIP FIELD AREA. TREES WITHIN DRIP FIELD AREA SHALL BE CLEARED AS SHOWN ON DRAWING EC -4. 7. CONSTRUCT WASTE WATER TREATMENT AND DRIP IRRIGATION FACILITIES. 8. STABILIZE ALL DISTURBED AREAS. 9. ONCE SITE IS STABILIZED AND PERMISSION IS GRANTED BY THE COUNTY EROSION CONTROL INSPECTOR, CONVERT TEMPORARY SEDIMENT TRAP INTO PERMANENT EXTENDED DETENTION BASIN SWM FACILITY. 10. ALL EROSION AND SEDIMENT CONTROLS SHALL BE REMOVED WITHIN 30 DAYS OF FINAL SITE STABILIZATION OR WHEN MEASURES ARE NO LONGER NEEDED. REMOVALS ARE SUBJECT TO APPROVAL BY THE COUNTY EROSION CONTROL INSPECTOR. 11. CLOSE OUT THE PROJECT. GENERAL EROSION AND SEDIMENT CONTROL NOTES, 1. NO MORE THAN 500 LINEAR FEET OF TRENCH SHALL BE OPEN AT ONE TIME WHEN INSTALLING A UTILITY. 1 ADDED DIVERSION DIKE, REVISED SEQUENCE OF CONSTRUCTION SAR 5 -8 -14 ,� A DESIGNED B .• PROJECT: B. F. YANCEY ELEMENTARY SCHOOL SET REV. NO. ENGINEERS DRAWN BY: WASTEWATER TREATMENT IMPROVEMENTS EROSION & SEDIMENT CONTROL PLAN SURVEYORS TLB ALBEMARLE COUNTY, VIRGINIA DRAWING NUMBER: R ic. No. 1_,,2 S PLANNERS TITLE: DIHR BY: EROSION AND SEDIMENT CONTROL NARRATIVE EC -5 . AsSOCIATES HFW Po Box 4119 3040 Avemore square P1. SHEET NUMBER: Lynehbura,VA24502 Charlun- 11k, VA22911 WWA NUMBER: FILE NAME: DISCIPLINE: SCALE: DATE: "OVAL � Phone: 434.316.6080 Phone: 434.9842700 CIVIL H. N�A NO. SHEET REVISION BY DATE N0. SHEET REVISION BY DATE 004 www.wwassoclates.net 213003.04 300304C_ENS2.dwg NIY L V. N//A'1 3/13/14 5 of 11 STONE CONSTRUCTION ENTRANCE CONSTRUCTION OF A SILT FENCE CONSTRUCTION OF A SILT FENCE PIPE OUTLET CONDITIONS TEMPORARY SEDIMENT TRAP (WITHOUT WIRE SUPPORT) (WITH WIRE SUPPORT) 1. SET THE STAKES. ?. EXCAVATE A 4"X 4" 'TRENCH 1. SET POSTS AND EXCAVATE A 4 "X4" 2. STAPLE WIRE FENCING TO THE POSTS. A A 1' VARIABLE* 70' MIN, EXISTING UPSLOPE ALONG THE LINE OF TRENCH UPSLOPE ALONG THE LINE A� 3 PAVEMENT STAKES. OF POSTS. 5:1 6'MAX. ORIGINAL GROUND _ - �/ ado ELEV. RM FILTER CLOTH 6" MIN. A MOUNTABLE BERM �- / ' r d 1.0' 77 (OPTIONAL) 67 CU. YD. /ACRE SIDE ELEVATION I 0 N - _�� I I ��� /� II l 1 PIPE OUTLET' TO FLAT - N VARIABLE /� 1 ` AREA WITH NO DEFINED ry EXISTING GROUND / �r "� / I II ![ ` / CHANNEL 70' MIN. IIII PLAN VIEW 67 CU. YD. /ACRE 7 FLOW ® /�� - vim% I 1 /�,i - ) B WASHRACK KA 10' MIN, : (EXCAVATED) 4' MAX. (OPTIONAL) III III = I- L a FILTER CLOTH ORIGINAL GROUND ELEV. 0 % * 3. STAPLE F'IL'TER IMAI'ERIAL =l. BACKF'ILL AND COIbIPACT I I ** lz' MIN, EXISTING 'TO tiTAKES AND EXTEND THE EXCAVA'T'ED SOIL. FLOW I II 111 III � II "' = CI *SEE PLATE 3.13 -1 COARSE AGGREGATE CLASS I RIPRAP PAVEMENT IT INTO THE TRENCH. 4" C C SECTION A -A FILTER CLOTH KEY IN 6" 9 "; RECOMMENDED FOR ENTIRE PERIMETER CROSS SECTION OF OUTLET COURSE VDOAGGREGATE I �\ POSITIVE SEDIMENT 10' MIN, fly 3. ATTACH THE FILTER FABRIC TO THE WIRE 4. BACKFILL AND COMPACT THE B TRAPPING DEVICE * ? >; / FENCE AND EXTEND IT INTO THE TRENCH. EXCAVATED SOIL. A * MUST EXTEND FULL WIDTH I ' / 'j v: CLASS L RIPRAP OF INGRESS AND EGRESS "�1: = }i1.. LENGTH (IN FEET) _ OPERATION PLAN VIEW IIII - (� I I I k r �� 3do (MIN.) (INXAC.�INAGE AREA /,. Vp 12' MIN. (�/� •• � 4/ _ / �- �_ � DIVERSION FLOW - I d �z 'J. U �_ �- DIKE 3" MIN. II /� ,r = PIPE OUTLET TO WELL 3 MIN. DEFINED CHANNEL. ��- SI -IFFY FLOW INS'I'r1LLA�I'ION `v - FILTER CLOTH (PERSPECTIVE VIEW) - PLAN VIEW SECTION A -A 6' -7° ( FLOW FLOW / I - L a // :rl� :;.'�' -�:.; ;:'•: ':' .....:•'.':: :••,;: .:•. ,..;.. ..••. •1.• A awvc. A .<:.: / EXTENSION OF FABRIC AND WIRE INTO THE TRENCH. Cl ` ARSE AGGREGATE EXCAVATED / / SEC'T'ION A -A �' AREA � FILTER CLOTH FILTER FABRIC FILTER CLOTH KEY IN 6" 9 "; RECOMMENDED FOR ENTIRE PERIMETER REINFORCED CONCRETE DRAIN SPACE NOTES: 1. APRON LINING MAY BE RIPRAP, GROUTED RIPRAP, GABION B-13 pp BASKET, OR CONCRETE. SECTION B -D POI1NTS A .SHOULD BE HIGHER THAN POINT B. WIRE La IS THE LENGTH OF THE RIPRAP APRON AS CALCULATED *� q11 J I _� I I USING PLATES 3.18 -3 AND 3.113 -4. O P COARSE AGGREGATE SHALL BE VDOT #3, #357 OR #5 DRAINAGE�VAY INS`T'ALLATION 1 3. Cr = 1.5 TIMES THE MAXIMUM STONE DIAMETER, BUT NOT SOURCE: ADAPTED from 1983 Maryland Standards for Soil erosion and Sediment Control, and Va. DSWC Plate 3.02 -1 (FRONT ELEVATION) -� LESS THAN 6 INCHES. OUTLET (PERSPECTIVE VIEW) ST SOURCE: Adapted from Installation of Straw and Fabric filter Barriers for Sediment Control,VA. DSWC PLATE. 3.05 -2 SOURCE: Adapted from Installation of Straw and Fabric 1;'ilter Harriers for Sediment Control, PLATE. 3.05 -1 Source: Va. DSWC Plate 3.18 -1 Sherwood and Wyant Sherwood & Wyant T YPII�AL TREATMENT TMENT - I SOURCE: VA DSWC PLATE. 3.13 -2 TYPICAL ORIENTA TION OF T YPI CAL WA TER WA Y Sediment•TraP Design ST -1 CROSS-SECTIONS 0 S S - SECTIONS TREATMENT - (SOIL STABILIZATION BLANKET) TEMPORARY DIVERSION DIKE' d�atna area (acres) s <3> 2 ,2, p CRESTOFSTON WEIR � • trap wlumes eL�• (SOIL STABILIZATION BLANKET) INSTALLATION CRITERIA COMPACTED SOIL elevation (ft) area (si) volume(cy)] - - 489 547 DRY STORAGE K VARIABLE• SHALLOW _ 490 85Q 25 9 SLOPE., '` ANCHOR SLOT " y. - 492 1532 114.11 i. NOTES - ... � I 494 2356 .,.,.25811:.:.. wErsroRacE �* ` _ _ a hux 496 3621 479 5 - APPROXIMATELY 200 STAPLES REQUIRED � .o�u � I - - - _ - - j (osavAtEO) H c�pouNno' - �� ON SHALLOW SLOPES, STRIPS OF PER 100 SQ. YDS. OF MATERIAL ROLL. _ FILTER CLOT III I I II III III -I .. NETTING PROTECTIVE COVERINGS ANCHOR SLOTS, JUNCTION SLOTS & - CoTllp acted 511 ___ __ _ _ ELtV• MAY BE APPLIED ACROSS CHECK SLOTS TO BE BURIED 6" TO 12 ". TYPICAL CONCRE'T'E LINED DITCH TYPICAL GRASS LINED DI'I'CIT �s�g eurE a�a r THE SLOPE. 1 1 _ -_ - -- - __ -- COARSE AGGRErATE cuss i RIPW? _ 12° MAX. 4:1 OR FLATTER TYPICAL VEE CROSS SEC'T'IONS { { { wet storage 18" rnTn. - - -_ -- - -- - 6" MAX. STEEPER THAN 4:1 L�� I I I I Wet Storage retlUlred (cy) (67 DA) 142 0 JUNCTION SLOT - I f T I I I I I 4 I i -Flow w bottom of stone weir (ft) _ - - - - -- - -493 0 - - -- - i - -- - -- EDGE AND END JOINTS I I I I I I I I I I Wet Stora a provided at this elevation c 186 1 I - -- - - - -f slope of wet storage sides 2 1; I BERM CHECK SLOT * TO BE SNUGLY ABUTTED g p -- - (y) WHERE THERE IS A BERM AT THE TOP OF THE SLOPE, (JUTE MESH WILL HAVE i D - -- - - TERMINAL FOLD STAPLED LAP JOINT IN I I i weir length (ft) (6x DA) 12 7I BRING THE MATERIAL OVER THE BERM AND ANCHOR IT - - -- - - -- - - -- - BEHIND THE BERM. LIEU OF EDGE JOINT) I I I I i I dry storage: bottom of trap elevation (ft) 489 LAP JOINT 2" MIN. I * -. - ' I V PARABOLIC WATERWAY CROSS SECTION 1.5 rnln. dry storage required (cy) (67 DA) 142 0; bottom trap dimensions 10x40 (JUTE MESH ONLY) I I TAMP FIRMLY I crest Of stone Weir 495.01 top of dam elevation (ft) 4961 ANCHOR SLOT I I I dry storage provided atthis elevation (cy) 182 7I minimum top width of dam (ft) 8, STEEP 5' MAX. 4:1 OR FLATTER SLOPE 3' MAX. STEEPER THAN 4:1 I I I TYPICAL RIRRAP CHANNEL D p slope of dry storage sides 2:1, ;top trap dimensions I 435X90 i 2" I I D ON STEEP SLOPES, APPLY i - _ 6° TO 12" I I I I I I I 4V (KEYb[N CLOTH) PROTECTIVE COVERING PARALLEL TO THE DIRECTION OF FLOW I 1 I 11 1 I I - SOURCE: VA. DSWC PLATE 3.09 -1 AND ANCHOR SECURELY. -III II I 111 1 Jill I * I I I I I 1 CHECK SLOT I 1 I I F'ILT'ER CLOTH NO'T'E: ALTHOUGH F'IL'TER CLOTH IS PREFERED, A GRANULAR FIL'L'ER MAY BE SUBSTI'T'U'T'ED FOR 3.18 1 TO 2" I i FILTER CLOTH. ( FOR PHYSICAL REQUIREMENTS, SEE STD. & " Outlet Protection FIRMLY CHECK SLOT I I I I I I I I I I SPEC. 3.19, RIPRAP) VAR. VAR. ID (OP -1, OP -2, etc) OP -1 OP -2 OP -3 OP -4 1 PLAN VIEW TYPICAL CONCRE'T'E CHANNEL Design Flow cfS 10.91 0.71 0.10 0.10 4" = :i;.:..''.: a 6" TO 12" ao ( ) BRING MATERIAL DOWN TO A LEVEL AREA BEFORE .•:: o EXPANSION JOINT' A TERMINATING THE INSTALLATION. TURN THE END ~ STAPLING DIAGRAM (90' SPACING') Tailwater Depth (ft) 0.0 0.0 0.0 0.0 UNDER 4" AND STAPLE AT 12" INTERVALS. " Discharge Velocity (fps) 4.07 3.73 4.30 4.30 '. %•^.::: `.•..r,' .' . • . .:,;.' 12• *CHECK SLOTS AT MIN. "'..• :; :„ :: :': STAPLE FORMED FROM N0.11 STEEL WIRE. Class Class Class Class 50' C -C INTERVALS; 8" STAPLE MIN. LENGTH FOR SANDY SOIL. NOT REQ.'D WITH ALL o: r t''.'•: ' °'' o' @:.' 0 : ^� "a'' �(k"po' ^"' ''�'•'' $`:" 6" STAPLE MIN, LENGTH FOR OTHER SOIL. ';••as .I•..,?:•' t RI Rap Gradation AID AID AID Al Dry COMBINATION o,° �;Sa Dry Dry Dry 6 DITCH FLOW ov:.. .. brg : a : ', - . °:n; . .v �':'w:e o',:'b` >:` :'�xF 18° p p r � Riprap Riprap Riprap Riprap JUNCTION SLOT TAMP 6° IN DITCHES, APPLY PROTECTIVE COVERING TERMINAL FOLD NOT TO SCALE Aron Lent _ _ FIRMLY ICI la° DOWEL p Length (ft) 6.0 3.0 4.5 4.5 111- III - III -III- =III III- III -IIII PARALLEL TO THE DIRECTION OF FLOW. 12" 6„ I' -III III -� - :I 1 EEI I I -I 11= TAMP FIRMLY LOCA'T'ED AT JOINTS USE CHECK SLOTS AS REQUIRED. AVOID 4" Apron Width(s) (ft) 6.0 3.0 4.5 4.5 I --III- 1 JOINING MATERIAL IN THE CENTER OF GX6 WELDED WIRE FABRIC 1 r THE DITCH IF AT ALL POSSIBLE. a Side Slopes (H:V) 2:1 n/a n/a Na COMPACTED 3 3 iv eo • AS REQUIRED o N � D Apron Depth (in) 24 24 24 24 SOIL N ` o °° ° a° �° ° °" B/M PROVIDE VDOT STANDARD B/M a °�4Qg ogao9bo,q o° 09 0: 0:0 °• dog 3' DIA. WEEP HOLE, 6' 0. C. EC -2 LINER B/M aogoo. ° °o; aoa•oe•oo4s °•oa•oa��L. °SEC'T'ION °A A SCC SCC TYPICAL SECTION (SCC -1 1 3 SOURCE: ADAPTED FROM LUDLOW PRODUCTS BROCHURE PLATE: 3.36 -1 TRAPEZOIDAL WATERWAY CROSS SECTIONS NTS �p SOURCE: VDOT ROAD AND BRIDGE STANDARDS PLATE: 3.36 -2 SOURCE: VA. DSWC PLATE 3.17 -1 N z TEMPORARY & PERMANENT SEEDING SCHEDULE 3.32 -D gee U NOTES Open Channel Design Worksheet M o LAWN TYPE SEEDING RATE PER ACRE - _ 0 1. ALL PERMANENT SEEDING SHALL BE FERTILIZED, LIMED AND Project:' B.F. YANCEY ELEMENTARY SCHOOL WWTP I ° -- - -- - -` - -- ENGINEERS HIGH MAINTENANCE KENTUCKY 31 OR MULCHED AT THE FOLLOWING RATES: FERTILIZER 10 -20 -10 WWA Project Number:' 213003 I LAWN WITHIN - _ _ _ _ _ - - - - -- - - -- - _ - - - -- _ - - -- -- - - - -- SURVEYORS - - ( TURF TYPE TALL FESCUE 200 250 LBS AT A c By ; SAR _ PLaNlvfts c LOT AREA) SEEDING DATE SEASONAL NURSE CROP RATE OF 1,000 POUNDS PER ACRE, LIME OF AGRICULTURAL ; CL Date: 3/ E 1/2014 Revised 4 -6 -14 ! , GRADE LIMESONE AT A RATE OF 2 TONS PER ACRE; AND _ _.__ _ _. _ _... -_ .. -- - -_ -_. __ __ _ _. _. FEB. 16 THRU APRIL ANNUAL RYE C.) GENERAL SLOPES KENTUCKY 31 FESCUE 128 LBS STRAW MULCH AT A RATE OF 1 -1/2 TONS PER ACRE RED TOP GRASS 2 LBS MAY 1 THRU AUG 15 FOXTAIL MILLET DURING THE SPRING AND FALL AND 2 TONS PER ACRE IN 3:1 OR LESS Channel. SEASONAL NURSE CROP 20 LBS THE WINTER AND SUMMER. Incremental cA Allowable 2-Year Maximum W AUG 16 THRU OCT ANNUAL RYE Tc Slope Geometry 10 -Year Segment ID Incremental c Drainage IZ (inlhr) QZ (cfs) Liner Material Vex R2 n Velocity Velocity ITo (in/hr) Qua (cfs) Channel. Remarks d NOV THRU FEB 15 WINTER RYE 2. SLOPES LABELED AS 2:1 WITH VDOT ST'D EC -2 LINING MAY Area (Ac.) (min) (tuft) (fps) (fps) Depth (ft} Depth (ft) USE GROUND COVER PLANTINGS Incremental Accumulated � LOW MAINTENANCE HAVE AN ANNUAL RYE HYDROSEED W/ TACKIFIER PLANTED b z, z2 AND/OR VINES IN ACCORDANCE WITH o SLOPES 2:1 OR STEEPER / ON THE SLOPES AT PERMANENT SEEDING RATES IN LIEU OF SCC -1 0.40 0.78 0.31 0,31 11.00 3.96 1,24 0.050 0.0 3.0 3.0 EC -2 0.46 0.050 4,00 2.28 5.18 1.62 0.47 1.00 '�q:,,,o P *� . r3u�psf,TiO io TABLE 3.37 -C OF THE VESCH. USING THE EC -2 LINER TO ALLOW FOR EROSION N PROTECTION PRIOR TO GROUND COVER PLANTING. i a 1 REMOVED SCC -2, REVISED ST -1 CALCS, 0 DESIGNED BY: PROJECT: B. F YANCEY ELEMENTARY SCHOOL SET REV. NO. >°. ADDED DIVERSION DIKE DETAILS SAR 5 -8 -14 Ili DMJ WASTEWATER TREATMENT IMPROVEMENTS EROSION & SEDIMENT CONTROL PL,4N 1 ENGINEERS DRAWN BY: SURVEYORS TLe ALBEMARLE COUNTY, VIRGINIA DRAWING NUMBER: o R I PLANNERS TITLE: 90. 1225 DIHR BY: 1C, EROSION AND SEDIMENT CONTROL DETAILS EC-6 �o - r �.��� ASSOCIATES HFW {, S SHEET NUMBER: Po s °X 4T" 304° Avem °`e Square 1 WWA NUMBER: FILE NAME: Lyachbnrg,vA245o2 Charlottesville, VA DISCIPLINE: SCALE: DATE: 341 ONA� �� Phone: 434.316.6080 Phone: 434.984.2700 E 213003.04 300304C_ND2.dwg CIVIL H: N/A 3/13/14 6 of 1 1 N0. SHEET REVISION BY DATE N0. SHEET REVISION BY DATE ♦ `Y "• ".«WaSSOCIaLes. °`` V. N/A 3 'G UI d' O M 0 v (L W O O 0 M N q) U c m 0 N i 1 _� MP 28A -16 1 4, I- AGEE OF IEP l;l P1 UEL �& MIRY RY EARL Y �• - GAVIT,A I CS ! '1� � ---TMP 12aA�s6 / / 4vp �28A -10 AN -9__ OF E1/1 , NUEL & Mr^ RY ARY �- DAViTA I jAC SOi D.8. 5211 3�_9 D.j23o� P. 1? 5'10 -� D.B. /521 3 D.B/2864 P. 510 --�� ZON'c ": RU;.AI ARES %ONED: RUR ^I AR S h1P 1�'8 i i '` RESID_P TIAL / � = ENTiu ��� R���H L D ZONE`: RU AL AR- S %ONED: RUR L ARt aS Tiv'�P 1�8A,2 -17' �<_ RAI DH L. AND S LSI D ° -� n _ j0 D�TIAL / -. -2ES! E:�IT� DOSE: f'�� RO B hUDS01�� r �` TATES 1 7UMEfIT Z - - ?0 P. 198 -� ROS B. HUDSON L1FF E,` TATES / % t� Ulv1r �T ) N i / I / l o B. �j0 P. 198 TMP 128'12- 9 a,si �nr/E��: RURAL R S ' U c. - SIDE', 4/ L1, r i .4,RRY HUDSO'`1 / / TMP 1 28A2 3 / Ca fIT F ?' BEiIARLE H00L�80✓;Rn 9 v 'n:,D 19 9 45n v ^, / - / / Ei` 0= MA; ?Y 1ACINF }E T� YA I d F'_��E- ARY S�kkOC' �O - �LJ'v'_G: RL Z s ?EAS / I - � J� �^ -� r, n Q - U �' ^. ,4 RES ^!T1,4! Gw _�� ( " - �iF " �J ;�10 JD� 4Nc � T DL �, ON , _/ N� RURAfAREAS dQ � ,� �C �F "- j K I\j - ` 0.8. 5 212 ELE1 rAR�Y )L f{'�� �. �, �: -; TMP 128A2- 19 7nNV :D: RURAL ARE - S LARRY HUDSON -� NT / �� / r^ �,1h8f , -18 v r. ;GE' Al" - 0 �� �7� ' rj n 0 PJ� _ TP1P 12dA2 /C0i ,I�;TY A�st,.4r ?Lc- NvOL OARn _ D. E3. 1939 P. ��n �. / lEl Oi1✓IA.R 1 N - S' r� 'YAN E�F r1E'` ARY S OC' j�. �- _ _ -ONED: Ru <L I?EAS JD n c - r�' �Z" NFn. RUR�`7IREAS m 1 - U - V- A�RES, � ENTI.Z��. �� l �9• �J .✓ 0 J0� JE � � L�O. 1 /o' /`� TMP 128A2- 15.A ' �, D.B. �6� 12 �, . c�E: rar ?Y SCE OL - F �O " ✓IP 128. ^ -?- 15.A i � 5� JF: J - ,' �+ �5' -�� ` / , r,,v- 1 ;,;a« - �/ �;1,f.:, 1% 2 A2 -_G � R, "Y �.VATK;;JS / 1E RURa E O �G A� 1 �i ?E�,: .Cr1�, :NEL _;;:� ,��.. �✓ / ,�: �� (' ANT R �' i/ _ - r _��,C,r1c �:�1�, �/ r Ei^' r1 l�SOf> Dc nA_ LA. - -' � �5 j- _ �, I IED: ZURA _ '. / �� �A° p� s � F M�f 42F�A2 RAY ✓J.ATKIi;J �� /� �^ / ST..FA;t:1 �E; �':vEL :! lh�l 1 - �C 0' CANT R cP•'TIAL LAr,) -� �� i� �� _� �E G1c� N�ffELEf' Nf CiS0 D.B. 2 00 P. 86 - �� - �_ 0' /� S.3. 240)J P. 80 - - Z -� f -= - rr_ r�.� / / �.� - F / 1� , _ r ? i" -�' r . /�'' r r B °r °14 3D ?� 4 �-_ 2.- A� / = = �'-- _ Y __ �� - / - `' > , �- - ��• _ �� " _� �' �' / - RUR. <1.! ARcASv - ,� i APPROnA1 C�� A v ��'a �' n _- wti.�._r� JS R. r;fL �' _ /' _ - / / _ /A / � f r k ' =' , r '+ / r / ° - " �� / rr �C E �� 3 B. 4 $D ONcD: RURAL AREAS _-- 2. r C/ _ _ "� T� �� „r . r - , - - / _ - r • � � - -� . '/f :� �V = &�O � Z�ZD:/ RURAL AREAS r. USE. RE.S;D_N!;HL _ �� _ -�' 7 rwA?� y ` V SE: R l�e NTIAL � �� c� / f 7 ✓ -�- b4E : 4NDJ �` _ (i , -. - a.,.�n- �.v \. _ -\ \ \ nl `�J� -. f\ � ti \ � K _ .._ t, � ,nn (}� ' r; ?ITT �=- - ',- - r-�R v� r�rA _ --�-- _�� _ =STS It1 CFWNI' _- o ti ^r 1 ` t-•. - - - s ^'17H : r,rf .2g i�` ., ✓- _ CJ '^., IY �t,h1snL B! 2'� / - :`'�,� A � 0 .R, � � , �:NL)S; c� = Ol7u� m� ��_ � . l � ��/- -. > S ✓,�, ��J�D r G� k 2 \ r I V �STR`AHAN %yrT - - r� -OE . s 1R; UEE: - -= '- ��� �� . _ _ �� A�.DS� S^�; TH . - C , 1 �8 r - - i- n R'. 1 A BEl• ARl_� CO NTY CE�� B'�ARD .i � \ - � -"^^"'� �c -,. a�w�_ - �^ -�.,� � �� �' -i. i � A . [� B. " �- - ham_ =F �" - r ✓� g _ N V nh• �. �, �- J � `O �. ,�' i .�r�,- �. �� 'J,G' !?UREA' Af�� r_ 1` �� X--�. � � A a _ A� `� ,�J� lT�. 4449 P. �6 ,i r8 �: ^' r ; 1 I nF• ®- " 70Nc RUR_ 'RS �faPPR�X7i✓IArE G O(.�49t y �� c �_ �Bi �2" �� ��� ^ � �, A - - - S �/t O�,, _��_ �� �f1�S_: 6Ai., r.c;�nFN Si ?,`JL G'JYi7 LOvF'1 -, I^y l �� �� J -� �� �� �R r� �- E, r V -�� �: ^� � - V������ A _ A ��,.�� o -� J� - a c r.,, r " ) ��, -r _ J ,� Ur 1 v- S 3U -R / r S -� / e �r / 1 �� I \�- 7 „� ,� ��; ?�� al "ANG C ��� � T� O -u �l QQ11G�PROh NLIILOCATIO' �t1�E: ._ T ii F F rte+". "`-r' _s-'. -� ! /'� r �r1'.S, r_ L OST DEL�PED ���. 1' \� � - n c , < 4� I . i ` , S _� r OF 10 F. JT: ?EAM BUrLR _ 7 �� -��� UNC -bNTAINED r s' o `, 5�� Tc PATH / 2 r 5� 0 1 > �� o _ MoD 5 �� � s f ° _ `��5� (II T� RATH� ( a �\ I �) _ -_ _ AINAG REA DR E1�1 Tc PATH '_s �` s / ��OD 5� r �, o DA -,6 30ACt SHALLOW CONC. FLOW `- r ( ) �" - CN =70. SHALLOW CONC. FLOW ��" �' �� ( ) r5'� �� o��` �� ��;II�I�� I, i ) (CI�ANNEL FLOW) �° v r i i ) �%�' c �' �� �� w _ - 5,,.7 min 5`� x�� ' �� I; V I �- - ..... r r > -23A / " . c RrJ -�,-.r AREA, D. - 5;� -� L Tc PATH o � �r� . RE n,?�'T �� \r �� I`�-� 5� ' / / �� rA /E E. PA,,Sm, R D. 1 I� -�� �I l ZON RI RAL ARE � 1 � � � � � 9 � Tc PATH 55 C' -- �P �', �� o '� �;, �9 \ usE: RE (SHEET FLOW) _ �� �\(3 1, / A9. 1 k �Tc �► (SHEET FLOW) i� _ �� I� s�;, / ,� G o 1 ��o cac - ] -�" �� 1 I Fx1s . �' PATH % � �.. I - �� n � 6' i (CHANNEL LOW) ; `°r. '°� � "' j .•� r, °"" z 11 � � 1 f�i � �> i I I l 5� �)� / O ,, oo- - � ; ; .,v 1 o 11 E� a - F. YANCEY I i 1 I i _ r_- 4 �� 55 t_L _V6 E FA, ?Y SCHOOL 5 \ B :r 1 �a 1 Tc PATH i ;Ar1cEY f r� 11 C SHALLOW C LOW �. _ r �- N ) 7- VfENIARY SCHOOL + F� I I j ^ _ O� 7625 PORTERS RO -'D - ' C R TH r1 Q} 5 I 625 PORTERS ROAD �� LRP _ HA EL FLOW o soo - - B "I ) � \ � ✓�� �E'`�T '� C'E� ..i , -. 0 _r- � ��` I G'. r�'�' � -, c - - - t. %l� { ��1 /y(�F�`` ` - ; S�v� ��' _ r� t� \_ � 1 +��- - - -- �'C H r_ r - �J �;.�� % 4� _ -��� - '� 1 R, F� rl E _ cr , � - �� --- _; -___� � -, -8 r r- ----._ U�R -F _'*- ----- -- �•- ,r�� Wit', ) , TE rrrr . -V-- ---7�� G�--_ _ ..C" ..�. /i �...d.� -r- �y; ®may... Tc PATH -� Sri? � - -, � == �_'` -�� ,,.�� .2_ I .� 2 - ✓ � �--- � r • -r`- _ -�_ q. -- ✓ 1 � 7� ' (SNEE? FLOW) �5.�. %,' // ^^�v ter' '- . '-- _!` �' , GJL�o� Vii. + - i� \. i - , ( \. t -i -� � ,.2. �- - _ • -�'�r� I -('- �� ri g U r� a slMPSOr { s1,.1PSOl: l 43 �% S1:�1PSOrU c z \ o sL✓1PSON � �� P. - " -,RK G�� III �; ,/ -a;� � / � \�� +��� f•= ��r --... ��^Rr< ^'�' I �;:� 7 PARK 2 \E /6 /fJJ�O ' % ' �. V ��_ �x �� v r i 5�/ /t/ T i boy 4,,r /�� /� /� %� �?0 ��, /5 / e�� 5 l / ( �_�( r �I PRE - DEVELOPED 0 JJ��� 1 '� 0� ���� a ��5• /; POST- DEVELOPED ' � �� ,° /� �� 5? � DRAINAGE AREA DRAINAGE AREA DA -7.33 AC��l� / r /�: �� �� �\ y1 ..� DA =1.03 AC 4%� �. i f" / /c ( f CN_ 64.0 CN =68.4 Tc =24.8 min. 6g / ` �,n. Tc -19.3 min. b9- PRE - DEVELOPED CONDITION POST- DEVELOPED CONDITION LEGEND LEGEND Pre- Develo ed Draina a Area DRAINAGE AREA �e m® o.® l� I®r P g DRAINAGE AREA -- Post - Developed Uncantained Drainage Area Post - Developed Drainage Area ..L:ry� .: .... , n a e od a d hu abon _ -. a - User. DESCRIP110N SQ. FT. CN Sod Group Tc PATH -® --�- _ x„ _.... o od La d-tlse Are abulabon,.,,, . ,. .. _ ,�, , ,. Ra al etlt _ � a T . ._ .., s . _ » , ... _ ,.. RaUona) N)ethgd Land Use.AtQa<Tahulahon.... s.;, Tc PATH -� DESCRIPTION SQ. FT. CN Soil Group _ - - DESCRIPTION SQ. FT. CN Soil Group' Forest 120,351 55.0 B Forest 3,395 77.0 D Forest _ 72,244 55.0 B _ Forest 18,809 55.0 B Forest 3,395 77.0 D Buildings 1,650 98,0 B Buildings 1,530 98.0 B 9 School 119,852 80.0 B _ School 119,852 80.0 B _- _ _ - Gravel Driveway 5,873 93.0 B RoadlDilch 48,111 74.0 B Grass 18,586 61.0 8 Road /Ditch 48,11.1 74.0 $ Gravel Driveway 1,966 93.0 B _. Grass 24,249 61.0 B _ _ _ Gravel Driveway 1,084 93.0 B Grass 29,788 61.0 B� Protect Qraa Cft19n Summary ,.,..3,r,w .r „ ,, - ,.Pro ectAreaLQesr n Su a •.'. r ^:., _1... g !ttltt rk . Total': 319 454':sf or 7.33'Ac. c Total' 44 918 sf or 1.03 A . �...,., Project Area;Deac�n Summaryi, . _ Weiyhted CN 64 0 Total sf or 6.30' Ac. Weighted CN 68 4 . - ..::..... ...., ... .. ... k -„ Y?. Via. .< y..... 4 .... ..... ..... � -.. � s �.. .., > ,. _, a ....... ..... a..a"�xR3...... .... ,..> xxst"�zh:a....... A3.e _74,474 r ;s,xk xt ;:e r z £E•b fi z� Tc SummarY .. ,.,,. .. , .> Weighted CN = 70.3 -> TR -55 ethod Shallow Cone. Flow B -->C Channel Flow C - -End Total Time min. // heel Flow A B M .. .i. .: .: .. .. : e. .::. Tc Summary', " ` '` " `° " "' Lenyth (ft.) 180 Lenyth {ft) 40 Length (ft) 34 Sheet Flow (A->B) (TR -55 Method) Shallow Conc. Flow (B->C) Channel Flow (C ->End) Total Time (min.) Length (ft.) 211 Length (ft) 241 Length (ft) 904 IF THIS DRAWING IS A REDUCTION Sheet Flow (A,>B) (TR -55 Method) Shallow Cone. Flow (B - -C) Channel Flow (C - -End) Total Time (min.) Slope (ft(ft) 0.075 Slope 10.0% Height (ft) 3 Length (ft.) 211 Length (ft) 241 Length (ft) 872 - n Value o.4o Surface Unpaved Traveltimebasedon 19.3 IF THIS DRAWING IS A REDUCTION Slope (tuft) 0.040 Slope 4.2% Height (ft) 37 n Value 0.24 Surface Un aged Travel6mebasedon 24.8 GRAPHIC SCALE MUST BE USED p Slo e ft/ft 0,040 Sloe 4.2% Hei ht ft 36 p { ) p 9 O P2 3.7 Velocity (ft/s) 5.1 KirplchNomograph. GRAPHIC SCALE MUST BE USED nValue 0.24 Surface Unpaved Tiaveltimebasedon 24.7 P2 3.7 Velocity (ft/s) 3.2 Kirpich Nomograph. Tc (min.) 18.3 Tc (min.} 1.3 Tc (min.) 5.3 SCALE: 1 » = 1 00' Tc (min.) 18.8 Tc (min.) 0.1 Tc (min.) 0.3 3.7 Velocity (fills) 3.2 Kirpich Nomograph. SCALE' 1 " = 100' Tc (min.) 18.3 Tc (min.) 1.3 Tc (min.) 5.1 100' 0 100' 100' 0 100' 1 REVISED DRAINAGE AREAS AND COMPUTATIONS USING TR -55 SAR 5 -8 -14 pfa 'TH �r �i R " " I 1�No. I ?2s � ww S,0 j ( ts1 ,+ = ENGINEERS SURVEYORS PLANNERS ASSOCIATES Po Box 4119 30 {0 Aven,oie Square P1. Lynchbur.VA2i502 Chiidws, ills, VA 12911 Phone: 434.316.6080 Phone: 431.98 ,2700 www.wwassociates.net DESIGNED BY: SAR PROJECT: B. F. YANCEY ELEMENTARY SCHOOL WASTEWATER TREATMENT IMPROVEMENTS EROSION & SEDIMENT CONTROL PLAN ALBEMARLE COUNTY, VIRGINIA SET REV. NO. DRAWN SAR DRAWING NUMBER: EC- 7 TITLE: PRE AND POST DEVELOPMENT DRAINAGE AREAS DIHR eY: HFW SHEET NUMBER: �f WWA NUMBER: 213003.04 FILE NAME: 300304C_SWM1.dwg /D�I1S/CIPLINE: CIVIL. SCALE: H: 1 "-50' N/A DATE: 3/13/14 N0. SHEET REVISION BY DATE ND. SHEET REVISION BY DATE X1/1 V: CN UI tl- C) 0 04 C) C4 i E�l 4� Z-V X -- �N G -S HUDI� HEI D. 3. 1444 P.1360 RUR4L-,ARE_4S 7 - __D­ 7 7 1 P -, I �i�` OVA'- 72-21 z MES AND HELEN UDS, 490 &5 01 0' ID. B. 444 P. 3f660 �URA Ir AREAS IT _k',DS 7_1 ---------- RES,'DI`7`,ITIA.L 0 �-v U RESIDENTIAL t PPROX I MA 21 1� 11E �A TE 1 J 7� cy�AE I 00`Kp�_FLOOD L-,-- (i n O'r ANDS r _�11E�JIANDS CC o� TL 1(_-,-;A/`,',\1EL Ll �Ais J_. _ _U�,TC)� S TREAA41CHANNEL LIMITS J, Orr Z� TLA N D S - _4 -ANDS 4 !-- _\ / -- WETi --- - ------- 40,358 Jr �'T pcj/,,�j 'wqF� - 128A2 - �12 \ 'IN IN, )ARD \ALLIEMARLE COUNT,( SCHOOL 'SC 7 IN, TMP\,,28,A2-22 I'll ALB-, -MARLE COUNTY SCHOOL BOARD O.B. 444 P. 746 4 _D RUR,�_\ AN -T/,41 USE- �V�,� 7 RE_S/DEFJ A",1D -A-Pr PROXIMATE D.B. 44 4 746 I'eD b) _,�PROX,INIATE us�_: A' CANT RI DERTIAL LAND 0 v- _-T C/o 0 /4 C 34i X I OOYi��FLOODPI -ji'! x 50 -7 k/ I OOYR�LOODPLAiN 1C A BATTING B, vc" a N\- Z E C-�CE w Oi�-�, T 0 [q i00 STREAA! 3JF�_,P �b 00 IPF AGE APPROXIMATE LOCATION — -T A X \ �� I EXISTING OF \�, 100 FT. STREAM BUFFER N _/ DRAINFIELD :1 1^0 ' cD � � � � � � � v � �_-� � �� � � � � 529 � ����' / � I � � �� � �- —' � _ � V � 1 I� � � � �g9 • \ ,--- --' \ CANTER Q1) c),6 1 28,-� BOXES TA4P 1281 DOSING X II F4 C_ L -3.3. 7 P�;; FA \(E E DOSING J8 -v 5? 5J2 l 1 h �� V ZONED: RL R 'A N"< WOODEN USE-: RE S, 4_ _ l`VOODEN ovo \USE: RESI� S A, DD LID CINIR�: 7E �C LID'--- S_ SEPTIC c:3 �� I _� LID D y , �� ,r, I SEPT I - � �_-j -4- TANK EX. C HA i N A�� EX ST. T4NK EX 58 -X. CrJAIN_ 9 S F. - LINK FE,,\I'-' CONCRETE SWALE -E,I,ICE �, — \ _._- �A X SW CONCRETE- __T D ti 1v1iSCL__LLA`.1 -OUS C 7AI\1 L LID _M'SCELLANE-00S - \ �,,� \\ _ i I �' - - -� � I C'E411 OUT \ > I _)��T EX. 7 { 0�' y � 00 EX. -1 4i T ��3 ­J B. F. 'I"ANCEY �,-�3,2. 0 3 kAi- SCHOO� N D27.1, 6� N FARY -J > sA'AD< AERIAL SURVEY CONTROL PO/N7 05 2. YA i I --?Y SCHOOL i,--ELEV=532.08 / N 3822527.1620 ME[" TA cv PORTERS R04 D =5= J J 0_2 ;_, _ \ ' I \ � y -'' —�� may_ =�.1 ��l \ CA LIMITS -OF BMP ANI ALYSIS AR AC 5 ROAD E 11455115.0020 (D X FLAGPOLE °'� / = A __MEA=4.50 IMPERVIOUS AREA=3,4741 SF (0.08' AC) ZAGPO" 1-100 C) 3_ �� -- �� �-- _ �� �A \ A i \ �j EP<IST 1.8% IMPERVIOUS _ - - _A_ Jl� % k L0 x ----- LIMITS- OF -BMP ANA ANALYSIS AREA 47 Ex I S T AREA=4.50 AC - \ - _ V -NCHIJ'RK �7_5 13, 4 i / �RAIA)AGL fj9ITC C, 7 DRIINAG� ITCH' CH' IMPERVIOUS ARE:&=-7,091 (0, 16 AC, IT) _ 3:69` IMPERVIOUS BENCHMARK FOOT C ED Sc),Ap� HIS 'D V CORNER GE- E�/= j 28.8 _ti EL' EXiST,','jG 0 HOOP 9 P,�R , G 0_ \ CHISELED SQUARE CORNER OF DI I �., I BASKETBALL C I I _A '-L_L�l -528.81 i0op '56 \ ��_ EXISTING 0 ID _z4/ 57 9 PARKING . S_,!%'G �- y ,\ \ \ sli"'m BMP PP DROP C) � -1H E OHF- 11612'19 / �-- J 0H_ -�EXISTING OH OHE 13,1�P E '8 I c. ET 'N _L SPREADE 0 E OU --------- -- ---SW,',l 5�8 T VEL SPREAD-..-- 0 vw O�, 1,4- LOW__F1AAG_1WG OHE NAY ww� 7 -T_ ��x __ - �' �`' S /�� 2 �V� / A OcA < LOW-HAN�C,­,,G OH E / W Rr- 71 \10.5'+ CLEARANCE 77 waL,\ 7/ P OL 1 E_1 7; � J �y _�?o (F) CLEARANCE RF b 16 > 4 . L11 POLE (r� �_ __ v �- - -x\11 i 1 � . ^ c' T ` ' "�� ----- �`y �A.- ��� 1 � � �--_ -_ \ .�_ - - -._-- - / 1' -. A -� - ,. ---- -_ � � (� : A Ul arn _L tt�_ Ur 571� D q ­ A-EA EDICATFD - USc H L E 0 IE S110PSON 0 PARK / BEXHMARK FOUND X7 SIMPSON v_RAILROAD SPIKE PARK IN POWER POLE I�� I SIA RAILROAD SPIKE PARK 51O �PSON BEPI�,-HAJARK FOUND SIMPSON PARK IN POWER POLE \ l \� � \�� y�, �, �,,,v ELEV=516.25 � � ELEV=516.25 v PRE-DEVELOPED CONDITION POST-DEVELOPED CONDITION LEGEND LEGEND BMP ANALYSIS AREA BMP ANALYSIS AREA IF THIS DRAWING IS A REDUCTION IF THIS DRAWING IS A REDUCTION GRAPHIC SCALE MUST BE USED GRAPHIC SCALE MUST BE USED SCALE: 1 50' SCALE: 1 50' M-1" 50' 0 50' mi 50' 0 50' 'TH OP DESIGNED BY. DMJ - PROJECT. B. F. YANCEY ELEMENTARY SCHOOL SET REV. NO. ENGINEERS WASTEWATER TREATMENT IMPROVEMENTS EROSION & SEDIMENT CONTROL PLAN SURVEYORS DRAWN BY: KTM ALBEMARLE COUNTY, VIRGINIA DRAWING NUMBER: TITLE: PRE AND POST DEVELOPMENT BMP ANALYSIS AREAS R 1c, No. 1225 PLANNERS EC-8 — .- DIHR BY wa k 1044NAL Etz 0###**** ASSOCIATES PO Box 4119 30 40 Avemore Square Pt. Lynchburg, VA 245021 Chadott,s, ill,, VA 22911 Phone: 434.316.6080 Phone: 43-1.984.2700 HFW SHEET NUMBER: 8 of 11 WWA NUMBER: 1 213003.04 FILE NAME: 1 300304Q_SWAf2.dwg DISCIPLINE: CIVIL SCALE: H: 1"--50' V. NIA DATE: 3113114 NO. SHEET REVISION,, BY DATE NO. SHEET REVISION BY DATE 3 v UI O M a O M i rn C v a. U w 0 0 0 M N U C m 0 N i 10 +00 10 +50 PROFILE VIEW: NEW 3 INCH PVC IF THIS DRAWING IS A REDUCTION GRAPHIC SCALE MUST BE USED HORZ: 1" = 20' 20' 0 20' Mw 5' 0 5' VERT: 1 " = 5' - - -- - " -_- - -- TOP -OF- EMBANKMENT - - - -- - - -� - - -) -- - - - -- 8.00'- -ELEV =496. - - -- - - - -- _-- - - - - -- - -- - - -- - - 100 -YR WSE= 493.76' 495 100 -YR WSE= 493.76' _� NEW GRADE - - -- -- - _ - NEW GRADE-,_ -, - - - �0=1R �NSE =493. 495 495 - 2 -YR WSE= 492.28' EXISTING GRADE 2 -YR WSE= 492.28' EXISTING GRADE CONTROLLED FILL 3 = 490 -- -- __- - I _ COMPACTED TO 98% 490 490 - - - � 1 DRY 490 CLASS 34.5 L.F. 3" PVC OF NEW 01.74% CLASS Al _ - RIPRAP ON - FILTERFAB L =4.5' - -R1 P_0 - - - -_ - - - _ . - - - - _FILTER- ABRIC = - -- - _ _ CUT OFF TRENCH L =3' 1 - - - - -- -- - - - - -- -- CUOFF TRENCH -- W =3' 041-4' DEPTH 485 ---- T =24 "- IN. - - - - -- - - - -- - - - - -- -- -MIN -4' BOTTOM- WIDTH- 485 -MAX-1: I-SIDE-SLOPES- ALONG THE CENTER °o -LINE-Of'-EMBANKMENT- MAX 1:1 SIDE SLOPES N I M cv , N ALONG THE CENTER - - - - -L -o- -- - - -- -LINE 0 — EMBANKMENT oc + �.. � 480 - - -- - - - -¢ o i. - - - -- �� -o � - 480 -- - - - -- - - -- -�-- 10 +00 10 +50 PROFILE VIEW: NEW 3 INCH PVC IF THIS DRAWING IS A REDUCTION GRAPHIC SCALE MUST BE USED HORZ: 1" = 20' 20' 0 20' Mw 5' 0 5' VERT: 1 " = 5' 10 +00 10 +50 PROFILE VIEW: NEW 15 INCH HDPE OVERFLOW PIPES 1 1 REVISED SWM FACILITY GRADING NO. SHEET REVISION IF THIS DRAWING IS A REDUCTION GRAPHIC SCALE MUST BE USED HORZ: 1" = 20' 20' 0 20' 5' 0 5' VERT: 1" = 5' SAR 1 5 -8 -14 BY I DATE I NO. STORMWATER FACILITY NOTES 1. A GEOTECHNICAL INSPECTOR MUST BE PRESENT TO MONITOR THE CONSTRUCTION OF THE EMBANKMENT AND TEST COMPACTION. ALL SOILS USED FOR THE EMBANKMENT SHALL BE APPROVED BY THE GEOTECHNICAL ENGINEER. IF POOR OR WET SOILS ARE ENCOUNTERED IN THE EMBANKMENT AREA, CONTRACTOR SHALL NOTIFY THE GEOTECHNICAL ENGINEER. 2. THE EMBANKMENT MUST BE CONSTRUCTED IN A MANNER TO MEET ALL THE REQUIREMENTS AND SPECIFICATIONS OF MINIMUM STANDARD 3.01 OF THE VIRGINIA STORMWATER MANAGEMENT HANDBOOK. 3. ALL RIPRAP SHALL BE PLACED ON VDOT STANDARD WOVEN GEOTEXTILE FABRIC. VEGETATIVE GROWTH SHALL NOT BE PERMITTED THROUGH FABRIC. 1.00'- --1- 4. EMBANKMENT FILL SHALL BE IN ACCORDANCE WITH THE PROJECT MANUAL. SHEET REVISION LE VEL SPREADER NOTE: LIP OF LEVEL SPREADER TO BE AT 0% GRADE. MINIMUM LENGTH OF LEVEL LIP CROSS SECTION IS 15 FT. JUTE, OR EXCELSIOR OR EQUIVALENT STAPLED IN PLACE VARIABLE (MIN. 7') BURIED, ,6" MIN. nAt�wil}t� tMty K-- BURIED 6" MIN. LEVEL LIP OF SPREADER — MpV. 6, LEVEL SPREADER WITH VEGETATED LIP CROSS SECTION VDOT #3, #357, #5, #56 OR #57 COARSE AGGREGATE IN VARIABLE (MIN. 7') GALVANIZED WIRE MESH BASKET r— SECURE WIRE MESH TO TIMBER * FILTER CLOTH / 6X6 TREATED TIMBER SECURE WIRE TO GROUND 6" MIN.�� WITH WIRE STAPLES � #5 REBAR TO 7' MIN. I 3' UNDISTURBED SOIL ' MIN. 6' LEVEL SPREADER WITH RIGID LIP * MIN. PHYSICAL REQUIREMENTS OF FILTER CLOTH NOTED IN STD. & SPEC. 3.19, RIPRAP LS 2:1 OR FLATTER 2:1 OR FLATTER SOURCE: VA. DSWC AND N.C. Erosion and Sediment Control Planning and Design Manual PLA`T'E: 3.21 -2 BY I DATE S 0 �sa 1 ANAL_' 1 � I I I I I \ i i I I I I\ 0 Ln 2 JI/ \ �I I 1.00 CLASS Al RIP -RAP BOTTOM OF POND FOREBAY RIPRAP WEIR WALL DETAIL NOT TO SCALE 1 \ RIGID LIP LENGTH =20'\ ` 1 LS DEPTH =0.6' LOWER / SIDE SLOPE WIDTH =6' rain. -.' 'DRYS RIPRAP VEGETATED LIP o ON FILTER FABRIC \ LS LENGTH=20' �r LENGTH =3' DEPTH =0.5' \ WIDTH =3' ° \/LOWER SIDE SLOPE WIDTH =6% min. THICKNESS =24 " 0 � VDOT STD EW -12 0 ° (OP- 3/OP -4) NO STEEL MESH OP -2 o CLASS Al OVER OPEN{ DRY RIPRAP OP -4 96.20' N FILTER FABRIC I \ LENGTH =4.5' / `3" PVC `s OP -3 WIDTH =4�5' ` THICKNESS =227" / VDOT STD. ES -1 i " HDPE o' \ 0 RFLOW PIPES / oz \ DO ST ES -1 O ti VDOT STD. EW -12 S�-Oe Q� 'A 96.20' WITH STEEL MESH OVER OPENING \ , 0'� I jp. ENTERLINE OF CUTOFF TRENCH TOP OF EMBANKMENT= 496.20 / TOP OF EMBANKMENT WIDTH =8' F?REBA RIPRAP WEIR WALL Z/ / - SCC -1 I / IF THIS DRAWING IS A REDUCTION GRAPHIC SCALE MUST BE USED i SCALE: 1 " _ -20�- / 20' 0 20' r 0 r ENGINEERS SURVEYORS PLANNERS ASSOCIATES PO Box 4119 3040 Avemore Square P1. Lynchburg, VA 24502 Charlottesville, VA 23911 Phone: 434.316.6080 Phone: 434.9342700 www.wwassociates.uet DESIGNED BY: PROJECT: B. F. YANCEY ELEMENTARY SCHOOL SAR WASTEWATER TREATMENT IMPROVEMENTS EROSION & SEDIMENT CONTROL PLAN DRAWN BY: SAR ALBEMARLE COUNTY, VIRGINIA TITLE: DIHR BY: STORMWATER MANAGEMENT DETAILS AND NOTES HFW WWA NUMBER: FILE NAME: DISCIPLINE: SCALE. DATE: 213003.04 300304C_SWM3.dwq CIVIL H: AS SHOWN V. N/A 3/13/14 SET REV. NO. 1 DRAWING NUMBER: EC -9 SHEET NUMBER: 9of11 ELEV =496.2' I_ - - - -- 8.00' - I�I - - 100 -YR WSE= 493.76' 495 495 - _ _� NEW GRADE 1 40=`R- WSE - 493• -24, 2 3 - 2 -YR WSE= 492.28' EXISTING GRADE CONTROLLED FILL = 490 _ COMPACTED TO 98% 490 DRY WEIGHT-DENSI CLASS Al _ - RIPRAP ON - FILTERFAB L =4.5' RY C - IC -_ - - - _ . _ PER A $TM D -69_8_ - 33.2 L.F. Q NEW 15 H PD 06.71 I 485 W =4.5' T =24" -MIN.- _ _ CUT OFF TRENCH 485 - -- MIN 4' DEPTH MIN-4'-jBOTTOM-WIDTH- 480 -MAX-1: I-SIDE-SLOPES- ALONG THE CENTER °o -LINE-Of'-EMBANKMENT- 480 - - N I M , 10 +00 10 +50 PROFILE VIEW: NEW 15 INCH HDPE OVERFLOW PIPES 1 1 REVISED SWM FACILITY GRADING NO. SHEET REVISION IF THIS DRAWING IS A REDUCTION GRAPHIC SCALE MUST BE USED HORZ: 1" = 20' 20' 0 20' 5' 0 5' VERT: 1" = 5' SAR 1 5 -8 -14 BY I DATE I NO. STORMWATER FACILITY NOTES 1. A GEOTECHNICAL INSPECTOR MUST BE PRESENT TO MONITOR THE CONSTRUCTION OF THE EMBANKMENT AND TEST COMPACTION. ALL SOILS USED FOR THE EMBANKMENT SHALL BE APPROVED BY THE GEOTECHNICAL ENGINEER. IF POOR OR WET SOILS ARE ENCOUNTERED IN THE EMBANKMENT AREA, CONTRACTOR SHALL NOTIFY THE GEOTECHNICAL ENGINEER. 2. THE EMBANKMENT MUST BE CONSTRUCTED IN A MANNER TO MEET ALL THE REQUIREMENTS AND SPECIFICATIONS OF MINIMUM STANDARD 3.01 OF THE VIRGINIA STORMWATER MANAGEMENT HANDBOOK. 3. ALL RIPRAP SHALL BE PLACED ON VDOT STANDARD WOVEN GEOTEXTILE FABRIC. VEGETATIVE GROWTH SHALL NOT BE PERMITTED THROUGH FABRIC. 1.00'- --1- 4. EMBANKMENT FILL SHALL BE IN ACCORDANCE WITH THE PROJECT MANUAL. SHEET REVISION LE VEL SPREADER NOTE: LIP OF LEVEL SPREADER TO BE AT 0% GRADE. MINIMUM LENGTH OF LEVEL LIP CROSS SECTION IS 15 FT. JUTE, OR EXCELSIOR OR EQUIVALENT STAPLED IN PLACE VARIABLE (MIN. 7') BURIED, ,6" MIN. nAt�wil}t� tMty K-- BURIED 6" MIN. LEVEL LIP OF SPREADER — MpV. 6, LEVEL SPREADER WITH VEGETATED LIP CROSS SECTION VDOT #3, #357, #5, #56 OR #57 COARSE AGGREGATE IN VARIABLE (MIN. 7') GALVANIZED WIRE MESH BASKET r— SECURE WIRE MESH TO TIMBER * FILTER CLOTH / 6X6 TREATED TIMBER SECURE WIRE TO GROUND 6" MIN.�� WITH WIRE STAPLES � #5 REBAR TO 7' MIN. I 3' UNDISTURBED SOIL ' MIN. 6' LEVEL SPREADER WITH RIGID LIP * MIN. PHYSICAL REQUIREMENTS OF FILTER CLOTH NOTED IN STD. & SPEC. 3.19, RIPRAP LS 2:1 OR FLATTER 2:1 OR FLATTER SOURCE: VA. DSWC AND N.C. Erosion and Sediment Control Planning and Design Manual PLA`T'E: 3.21 -2 BY I DATE S 0 �sa 1 ANAL_' 1 � I I I I I \ i i I I I I\ 0 Ln 2 JI/ \ �I I 1.00 CLASS Al RIP -RAP BOTTOM OF POND FOREBAY RIPRAP WEIR WALL DETAIL NOT TO SCALE 1 \ RIGID LIP LENGTH =20'\ ` 1 LS DEPTH =0.6' LOWER / SIDE SLOPE WIDTH =6' rain. -.' 'DRYS RIPRAP VEGETATED LIP o ON FILTER FABRIC \ LS LENGTH=20' �r LENGTH =3' DEPTH =0.5' \ WIDTH =3' ° \/LOWER SIDE SLOPE WIDTH =6% min. THICKNESS =24 " 0 � VDOT STD EW -12 0 ° (OP- 3/OP -4) NO STEEL MESH OP -2 o CLASS Al OVER OPEN{ DRY RIPRAP OP -4 96.20' N FILTER FABRIC I \ LENGTH =4.5' / `3" PVC `s OP -3 WIDTH =4�5' ` THICKNESS =227" / VDOT STD. ES -1 i " HDPE o' \ 0 RFLOW PIPES / oz \ DO ST ES -1 O ti VDOT STD. EW -12 S�-Oe Q� 'A 96.20' WITH STEEL MESH OVER OPENING \ , 0'� I jp. ENTERLINE OF CUTOFF TRENCH TOP OF EMBANKMENT= 496.20 / TOP OF EMBANKMENT WIDTH =8' F?REBA RIPRAP WEIR WALL Z/ / - SCC -1 I / IF THIS DRAWING IS A REDUCTION GRAPHIC SCALE MUST BE USED i SCALE: 1 " _ -20�- / 20' 0 20' r 0 r ENGINEERS SURVEYORS PLANNERS ASSOCIATES PO Box 4119 3040 Avemore Square P1. Lynchburg, VA 24502 Charlottesville, VA 23911 Phone: 434.316.6080 Phone: 434.9342700 www.wwassociates.uet DESIGNED BY: PROJECT: B. F. YANCEY ELEMENTARY SCHOOL SAR WASTEWATER TREATMENT IMPROVEMENTS EROSION & SEDIMENT CONTROL PLAN DRAWN BY: SAR ALBEMARLE COUNTY, VIRGINIA TITLE: DIHR BY: STORMWATER MANAGEMENT DETAILS AND NOTES HFW WWA NUMBER: FILE NAME: DISCIPLINE: SCALE. DATE: 213003.04 300304C_SWM3.dwq CIVIL H: AS SHOWN V. N/A 3/13/14 SET REV. NO. 1 DRAWING NUMBER: EC -9 SHEET NUMBER: 9of11 v� 3 3 UI O O O t` v 'a U W �f- O O O N U t: m 0 CV i STORMWATER MANAGEMENT NARRATIVE PROJECT DESCRIPTION: IT IS THE INTENT OF THIS PLAN TO PERFORM THE CLEARING, GRADING, AND CONSTRUCTION OF AN ACCESS ROAD AND STORMWATER MANAGEMENT (SWM) FACILITY FOR A PACKAGE TYPE WASTEWATER TREATMENT FACILITY THAT WILL SERVE THE B.F. YANCY ELEMENTARY SCHOOL IN ALBEMARLE COUNTY, VIRGINIA. THE SITE IS LOCATED NEAR THE INTERSECTION OF PORTERS ROAD AND SIMPSON LANE. THE SITE IS BOUNDED TO THE NORTHWEST BY B.F. YANCY ELEMENTARY SCHOOL, TO THE NORTHEAST BY AN UNNAMED TRIBUTARY TO ROCKCASTLE CREEK, TO THE SOUTHEAST BY RESIDENTIAL PROPERTY, AND THE TO SOUTHWEST BY PORTERS ROAD. STORMWATER QUANTITY: STORMWATER MANAGEMENT FOR THE SITE WILL BE PROVIDED BY THE EXTENDED DETENTION BASIN SHOWN ON THESE PLANS. THE PRE - DEVELOPED DRAINAGE AREA FOR THE SITE CONSISTS OF APPROXIMATELY 7.33 ACRES OF LAND CONTAINING PORTIONS OF THE B.F. YANCEY ELEMENTARY SCHOOL, PORTIONS OF PORTERS ROAD, FORESTED UNDEVELOPED LAND AND, SOME SMALL EXISTING STRUCTURES. DRAINAGE FROM THE SITE FLOWS INTO THE UNNAMED TRIBUTARY TO ROCKCASTLE CREEK LOCATED ON THE NORTHEAST BOUNDARY OF THE SITE. THE PRE - DEVELOPED FLOWS AS DETERMINED BY THE TR -55 METHOD ARE 7.09 CFS FOR THE 2 -YR STORM EVENT AND 17.26 CFS FOR THE 10 -YR STORM EVENT. A DRAINAGE AREA MAP SHOWING THE PRE - DEVELOPED DRAINAGE AREAS IS INCLUDED ON DRAWING NUMBER EC -7. FOR THE POST - DEVELOPED CONDITION, THE DRAINAGE AREA FOR THE SITE IS DIVIDED INTO TWO DRAINAGE AREAS; A POST DEVELOPED DRAINAGE AREA THAT DRAINS TO THE PROPOSED SWM FACILITY AND A POST DEVELOPED UNCONTAINED DRAINAGE AREA THAT IS NOT CAPTURED BY THE PROPOSED SWM FACILITY. THE POST DEVELOPED DRAINAGE AREA THAT DRAINS TO THE PROPOSED SWM FACILITY CONSISTS OF APPROXIMATELY 1.03 ACRES OF LAND CONTAINING THE PROPOSED WASTEWATER TREATMENT FACILITY AND A SMALL BUILDING ASSOCIATED WITH IT, ITS ACCESS ROAD, AND THE PREEXISTING STRUCTURES. PLEASE NOTE THAT THE PROPOSED WASTEWATER TREATMENT FACILITY CONSISTS OF A SERIES OF UNDERGROUND TANKS AND DOES NOT CONTRIBUTE IMPERVIOUS AREA TO THE SITE. THE UNCONTAINED AREA CONSISTS OF APPROXIMATELY 6.30 ACRES OF LAND AND INCLUDES PORTIONS OF THE B.F. YANCEY ELEMENTARY SCHOOL, PORTIONS OF PORTERS ROAD AND SOME FORESTED AND GRASS AREAS. A DRAINAGE AREA MAP SHOWING THE POST - DEVELOPED DRAINAGE AREAS IS INCLUDED ON DRAWING NUMBER EC -7. THE PROPOSED EXTENDED DETENTION BASIN WILL PROVIDE ATTENUATION FOR THE 2 -YR AND 10 -YR STORM EVENTS. THE POST - DEVELOPED FLOWS FROM THE SITE WERE OBTAINED BY COMBINING THE HYDROGRAPHS FOR THE POST DEVELOPED FLOW ROUTED THROUGH THE SWM FACILITY AND THE FLOW FROM THE UNCONTAINED DRAINAGE AREA. THE COMBINED POST DEVELOPED FLOWS ARE 7.07 CFS FOR THE 2 -YR STORM EVENT AND 16.20 CFS FOR THE 10 -YR STORM EVENT. THESE FLOWS ARE LESS THAN THE PRE - DEVELOPED FLOWS, THEREFORE THE REQUIREMENTS FOR STORMWATER QUANTITY ATTENUATION ARE MET. ROUTING CALCULATIONS FOR THE PROPOSED EXTENDED DETENTION FACILITY ARE LOCATED ON DRAWING NUMBER C -10. THE ROUTING FOR THE EXTENDED DETENTION BASIN WAS PERFORMED USING THE TR -55 METHOD. THE PROPOSED EXTENDED DETENTION BASIN WAS ANALYZED USING THE 100 -YR STORM EVENT TO DETERMINE THE AVAILABLE FREE BOARD. THE MAXIMUM WATER SURFACE ELEVATION IN THE FACILITY FOR THE 100 -YR STORM IS 493.76'. 2.44 FT OF FREE BOARD IS AVAILABLE. STORMWATER QUALITY: STORMWATER QUALITY FOR THE SITE WILL BE PROVIDED BY THE PROPOSED EXTENDED DETETNTION BASIN SHOWN ON THESE PLANS. THE BMP ANALYSIS AREA FOR THIS PROJECT IS THE 4.50 ACRE PARCEL (TMP 128A2 -22) THAT ENCOMPASSES THE IMPROVEMENTS ASSOCIATED WITH THIS PLAN. THIS PROJECT LIES IN A DRINKING WATER WATERSHED. THE ALBEMARLE COUNTY MODIFIED SIMPLE METHOD WORKSHEET INDICATES THAT A POLLUTANT LOAD REMOVAL OF 0.23 LBS /YR IS REQUIRED FOR THIS PROJECT. THIS EQUATES TO A 19% REMOVAL RATE. PLEASE REFER TO THE ALBEMARLE COUNTY MODIFIED SIMPLE METHOD WORKSHEET CALCULATIONS ON THIS SHEET FOR REQUIRED REMOVAL RATE CALCULATIONS. THE PROPOSED EXTENDED DETENTION BASIN SHOWN ON THESE PLANS PROVIDES A POLLUTANT REMOVAL EFFICIENCY OF 35 %. THIS FACILITY PROVIDES A 30 HOUR DRAWDOWN OF A VOLUME OF RUNOFF THAT IS EQUAL TO 2 TIMES THE WATER QUALITY VOLUME (WQV). WQV= 7,091 FT' X 0.5" X (1/12 FT /IN) = 296 CF .2 X WQV= 2 X 296 CF = 592 CF WQV VOLUME PROVIDED = 2,105 CF POLLUTANT REMOVAL CALCULATIONS REFERENCE ALBEMARLE COUNTY MODIFIED SIMPLE METHOD WORKSHEET ON DRAWING NUMBER C -10, THE BMP ANALYSIS AREA MAPS ON DRAWING NUMBER EC -8, AND THE DRAINAGE AREA MAPS ON DRAWING NUMBER EC -7. TOTAL PROJECT AREA = 4.50 ACRES TOTAL IMPERVIOUS AREA = 0.16 AC TOTAL L(PRE) = 0.91 LBS TOTAL L(POST) = 1.14 LBS TOTAL POLLUTANT REMOVAL REQUIRED = 0.23 LBS DRAINAGE AREA TO PROPOSED EXTENDED DETENTION BASIN = 1.03 ACRES IMPERVIOUS AREA DRAINING TO PROPOSED EXTENDED DETENTION BASIN = 0.16 AC POLLUTANT LOAD TO PROPOSED EXTENDED DETENTION BASIN = 1.14 LBS EXTENDED DETENTION BASIN REMOVAL RATE = 35% POLLUTANT REMOVED BY EXTENDED DETENTION BASIN (1.14 LBS) (0.35) = 0.40 LBS 0.40 LBS POLLUTANT REMOVED > 0.23 LBS POLLUTANT REMOVAL REQUIRED. POLLUTANT REMOVAL REQUIREMENTS ARE MET FOR THIS AREA. Hydrograph Report Hydraflow Hydrographs Extension for Aub CADw) Civil 3D® 2012 by Autodesk, Inc. v9 Hyd. No. 1 = 7.088 cfs Pre Developed Drainage Area Hydrograph type = SCS Runoff Storm frequency = 2 yrs Time interval = 1 min Drainage area = 7.330 ac Basin Slope = 0.0% Tc method = User Total precip. = 3.70 in Storm duration = 24 hrs 0 (cfs) 8.00 6.00 4.00 2.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 0 180 360 540 720 900 1080 1260 1440 1620 1800 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 w-- Hyd No. 1 Time (ruin) - Hyd No. 3 Time (min) Hyd No. 6 --- Hyd No. 3 I t I l 1 1 Total storage used = 871 cult Tirre (min) ____ Hyd No. 4 Time (min) Hyd No. 8 --- Hyd No. 4 - Hyd Ne_ 6 Time (min) 1 Hydrograph Report Pre Developed Drainage Area Hyd. No. 1 -- 2 Year Hydraflow Hydrographs Extension Tuesday, 05 / 61 2014 Peak discharge = 7.088 cfs Time to peak = 729 min Hyd. volume = 27,725 cult Curve number = 68.4 Hydraulic length = 0 ft Time of conc. (Tc) = 24.80 min Distribution = Type II Shape factor = 484 Pre Developed Drainage Area Hyd. No. 1 -- 2 Year Hydraflow Hydrographs Extension for AutoCAD6 Civil 31302012 by Autodesk, Inc, v9 Hyd. No. 3 = 0.822 cfs Post Developed Drainage Area Hydrograph type = SCS Runoff Storm frequency = 2 yrs Time interval = 1 min Drainage area = 1,030 ac Basin Slope = 0.0 Tc method = User Total precip. = 3.70 in Storm duration = 24 hrs 2 Hydrograph Report 4 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAOP Civil 3D© 2012 by Autodesk, Inc. v9 Tuesday, 05 / 6 12014 Peak discharge = 0.822 cfs Time to peak = 727 min Hyd. volume = 3,023 cuff Curve number = 64 Hydraulic length = 0 ft Time of conc. (Tc) = 19.30 ruin Distribution = Type II Shape factor = 484 4 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAOP Civil 3D© 2012 by Autodesk, Inc. v9 Tuesday, 05 10 1204 Hyd. No. 6 Tuesday, 05 / 6 ! 2014 Hyd. No. 4 SWM Facility Routed 6.00 0.70 Hydrograph type = Reservoir Peak discharge = 0.179 cfs Storm frequency = 2 yrs Time to peak = 755 min Time interval = 1 min Hyd. volume = 3,016 cuff Inflow hyd. No. = 3 - Post Developed Drainage ffv�t. Elevation = 492.28 ft Reservoir name = Extended Detention SWM Facllitrpx. Storage = 871 cult Storage Indication method used 3 6 Hydrograph Report Hydraflow Hydrographs Extension for AUL CADO Civil 3D(D 2012 by Autodesk,; Inc. v9 0.90 Tuesday, 05 / 6 ! 2014 Hyd. No. 4 0.80 6.00 0.70 Post Developed Uncontained Drainage Area 0.50 Hydrograph type Hydrograph type = SCS Runoff Peak discharge = 6.907 cfs Storm frequency = 2 yrs Time to peak = 729 min. Time interval = 1 min Hyd. volume = 26,330 tuft Drainage area = 6.300 ac Curve number = 70.3 Basin. Slope = 0.0% Hydraulic length = 0 ft Tc method = User Time of cone. (Tc) = 24.70 min Total precip. = 3.70 in Distribution = Type li Storm duration = 24 his Shape factor = 484 Hydraflow Hydrograph5 E xte nsion for AU loC A O Civil 3D02012 by A utod les< . Inc. v9 0.90 Toes d -a 05 / 6 12 0 014 Hyd. No. 8 0.80 6.00 0.70 Combined SWIM Facility Routed and Uncontained DA 0.70 0.50 Hydrograph type = Combine Peak discharge = 7.066 cfs Storm frequency = 2 yrs Time to peak = 729 min Time interval = 1 min Hyd. volume = 29,346 tuft Inflow hyds. = 4, 6 Contrib. drain. area = 6.300 ac Post Developed Drainage Area SWM Facility Routed Post Developed Uncontained Drainage Area Q (cfs) 0 (cfs) Q (cfs) Q (cfs) Q (cfs) Q (cfs) Q.(cfs) Q (cf §) Hyd. No. 3 - 2 Year Hyd. No. 6 - 2 Year Hyd. No. 4 T 2 Year *'UU 1.UU 0.90 0.90 0.80 0.80 6.00 0.70 0.60 0.70 0.50 0.60 4.00 0.50 0.30 0.40 0.20 0.30 2.00 0.10 0 00 0.20 0.30 0.10 0 00 0 00 I.UU I.VU 0.90 0.90 0.80 0.80 0.70 0.70 0.60 0.60 0.50 0.50 0.40 0.40 0.30 0,30 0.20 0.20 0.10 0.10 0 00 0 00 I.UV = SCS Runoff 0.90 6.00 5.00 6.00 o.a0 = 7.330 ac Basin Slope 6.00 0,70 = User 0.60 = 5.60 in Storm duration 4.00 0.50 [D] Rise (in) 3.00 0,40 Hydrafow Hydrographs Extension for AutoCADO Civil 30.5 2Q12 by Pond No,I - Extended Detention SWM Facility 0.30 10 Hydraflow Hydrographs Extension for Autc CADO Civil 3D02012 by Autodesk, Innv9 Tuesday, 0516 12014 2.00 0.20 0100 11 1.00 0.10 Hydrograph Report 0 00 0 00 VU I 6.00 6.00 = SCS Runoff Storm frequency 6.00 5.00 = 1 min 4.00 = 7.330 ac Basin Slope 4.00 3,00 = User 2.00 = 5.60 in Storm duration 2 00 1.00 [D] Combined SWM Facility Routed and Uncontained DA Hyd. No. 8 -- 2 Year Q (cfs) 8.00 6.00 4.00 2.00 1 11 1 1 Hydrograph Report Hdlaflov+Hydrographs y Extension for AutoCADrV Civil 3DC92012 Ai / 4Y Hyd. No. 1 Pre Developed Drainage Area Hydrograph type = SCS Runoff Storm frequency = 10 yrs Time interval = 1 min Drainage area = 7.330 ac Basin Slope = 0.0% Tc method = User Total precip. = 5.60 in Storm duration = 24 hrs HYDROGRAPH 3.00 15.00 2 YR POST - DEVELOPED HYDROGRAPH 2.00 9.00 2 YR SWM POND ROUTING 1.00 2 YR POST - DEVELOPED UNCONTAINED HYDROGRAPH 5 2 YR COMBINED SWM POND ROUTING AND UNCONTAINED AREAS 0.00 [A] 7 [C] [D] Rise (in) 8 15.00 Hydrafow Hydrographs Extension for AutoCADO Civil 30.5 2Q12 by Pond No,I - Extended Detention SWM Facility Autodesk, Inc. v9 10 Hydraflow Hydrographs Extension for Autc CADO Civil 3D02012 by Autodesk, Innv9 Tuesday, 0516 12014 Hyd. No. 6 9 0100 11 = 3.00 15.00 Hydrograph Report 0.00 Crest. El. (ft) = 0.00 Hydrograph Report Average end area method used for volume calculation. begining Elevation =491.50 It Hydrograph Report 2 0 Hydrograph Report Weir 9oeff. = 3.33 Tuesday, 051612014 Hydraflow Hydrographs Extension r for Au!oCA09 Civil 3130 2012 by AutWesrt. Inc. v9 Invert . El (tt) Tuesday, 05 (6! 20 t4 Hydraflow Hydrographs Extension for AuIOCADr� Civil 3130 2012 by Autodesrt, Inc. v9 0.00 Tuesday, OS / 6 f 2044 1 v ro ra hs Extension for AuloCAD S�Crvd 3130201. Autodesrt Inc. Hydra! or Hyd g, p Exle .. 2 by ,. o = 4.926 cfs Tuesday, 0516!2014 Y, H dro ra hs Ex erasion for AutoCA00 Crv113 W 201. b Autodesrt Inc. 9 Hydraflow t Y , 9 P.. .. 2 Y , e Tu sda 05!6!2014 Y, Storm frequency = 100 yrs Time to peak Hyd, No. 3 0.00 Multi•Stage = No Hyd. No. 6 Time interval = 1 min Hyd. volume y = 17,478 cult Hyd. No. 4 00 1,.532 0 383 Hyd, No. 8 Inflow hyd. No. = 3 - Post Developed Drainage ftii Elevation = 493.76 ft Post Developed Drainage Area 1,911 1,722 SWM Facility Routed Reservoir name = Extended Detention SWM FacA�*Ox. Storage '""2' g = 3;728 cult Post Developed Uncontained Drainage Area 2,356 2,801 2,174 2,579 Combined SWM Facility Routed and Uncontained DA Peak discharge = 17.26 cfs Hydrograph type = SCS Runoff Peak discharge = 2.291 cfs Hydrograph type = Reservoir Peak discharge = 0.816 cfs Hydrograph type = SCS Runoff Peak discharge = 15.99 cfs Hydrograph type = Combine Peak discharge = 16.20 cfs Time to peak = 729 min Storm frequency = 10 yrs Time to peak = 726 min Storm frequency = 10 yrs Time to peak = 742 min Storm frequency = 10 yrs Time to peak = 728 min Storm frequency =- 10 yrs Time to peak = 728 min Hyd. volume = 62,585 cult Time interval = 1 min Hyd. volume = 7,413 cuff Time interval = 1 min Hyd. volume = 7,406 tuft Time interval = 1 min Hyd. volume = 57,583 cult Time interval = 1 min Hyd: volume = 64,989 tuft Curve number = 68.4 Drainage area = 1.030 ac Curve number = 64 Inflow hyd. No. = 3 - Post Developed Drainage f{vtaat. Elevation = 493.24 ft Drainage area = 6.300 ac Curve number = 70.3 Inflow hyds. = 4, 6 Contrib. drain, area = 6.300 ac Hydraulic length = Oft Basin Slope = 0.0% Hydraulic length = Oft Reservoir name = Extended Detention SWM Facts. yx. Storage = 2,618 tuft Basin Slope = 0.0% Hydraulic length = 0 it __., __, _,,, _, _ _ _..._,_ -_ - Time of conc. (Tc) = 24.80 min Tc method = User Time of conc. (Tc) = 19.30 min Tc method = User Time of conc. (To) = 24.70 min Distribution = Type II Total precip. = 5.60 in Distribution = Type II St-go lndicarwriamodused. Total precip. = 5.60 in Distribution = Type 11 Shape factor = 484 Storm duration = 24 hrs Shape factor = 484 Storm duration = 24 hrs Shape factor = 484 Pre Developed Drainage Area Q (cfs) Hyd. No. 1 -- 10 Year Q (cfs) Q (cfs) 18.00 15.00 12.00 9.00 6.00 3.00 0.00 18.00 3.00 15.00 1.00 12.00 2.00 9.00 15 6.00 1.00 3.00 5 0.00 0.00 Post Developed Drainage Area Hyd. No, 3 -• 10 Year Q (cfs) Q (cfs) 3,00 3.00 2.00 2.00 1.00 1.00 0.00 0 120 240 -Hyd No. 1 360 480 600 720 840 960 1080 1200 10 YR PRE - DEVELOPED HYDROGRAPH 1320 1440 1560 Time (min) 0 120 240 - Hyd No. 3 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time (min) 10 YR POST - DEVELOPED HYDROGRAPH 12.00 9,00 15 Pond Report [A] [B] 5 Hydrograph Report 0 00 [A] [B] [C] [D] Rise (in) = 3.00 15.00 Hydrafow Hydrographs Extension for AutoCADO Civil 30.5 2Q12 by Pond No,I - Extended Detention SWM Facility Autodesk, Inc. v9 Tuesday, 05 16 12014 Hydraflow Hydrographs Extension for Autc CADO Civil 3D02012 by Autodesk, Innv9 Tuesday, 0516 12014 Hyd. No. 6 0100 0100 Pond Data = 3.00 15.00 0.00 0.00 Crest. El. (ft) = 0.00 Contours -User- defined contour areas. Average end area method used for volume calculation. begining Elevation =491.50 It SWM Facility Routed 2 0 Q Weir 9oeff. = 3.33 3.3.3 3.33 3.33 Invert . El (tt) Stage I Storage Table 493.00 0.00 0.00 Hydrograph type = Reservoir Peak discharge = 4.926 cfs Stage (ft) Elevation (ft) Contour area (scift) Incr. Storage (tuft) Total storage (cult) Storm frequency = 100 yrs Time to peak = 730 min 0.00 Multi•Stage = No No Time interval = 1 min Hyd. volume y = 17,478 cult 0.50 491.50 0.50 49200 00 1,.532 0 383 0 383 Inflow hyd. No. = 3 - Post Developed Drainage ftii Elevation = 493.76 ft 50 493.00 1,911 1,722 2,105 Reservoir name = Extended Detention SWM FacA�*Ox. Storage '""2' g = 3;728 cult 2.50 494.00 3.50 495.00 2,356 2,801 2,174 2,579 4,238 6,817 Orifice Coeff. = 0.60 4.50 496.00 3,623 3,212 10,029 Storage Indication method used. .. = Na No No Q (cfs) SWM Facility Routed Q (cfs) Hyd. No. 6 - -100 Year 6.00 5.00 4.00 3.00 2.00 1.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time (min) -m Hyd No. 6 - Hyd No. 3 l 1 1 1 i I 1 Total storage used 3;728 curt 100 YR SWM POND ROUTING 6.00 5.00 4.00 3.00 2.00 1.00 0 00 Culvert I Orifice Structures 0. Vu 15.00 15.00 Weir Structures 12.00 9,00 9.00 1.00 [A] [B] [Cl [PrfRsr] 0 00 [A] [B] [C] [D] Rise (in) = 3.00 15.00 0.00 deg Crest Len (ft) = 0.00 0.00 0100 0100 Span (In) = 3.00 15.00 0.00 0.00 Crest. El. (ft) = 0.00 0.00 0.00 0.00 No, Earn` = 1 2 0 Q Weir 9oeff. = 3.33 3.3.3 3.33 3.33 Invert . El (tt) = 491,50 493.00 0.00 0.00 Weir Type = - -- •- - -- - -- Length (it) = 34.50 33.20 13.00 0.00 Multi•Stage = No No No No Slope (%) = 1.74 6.71 0.QQ n/a N -Value = .010 .010 .013 u/a Orifice Coeff. = 0.60 0.60 0.60 0.60 Exfi,(in /hr) = 0.000 (by Contour) Multi -Stag. = Na No No No TW Elev. (ft) = 0.00 rmm:a�cwo,l:ca o�rcaNS. earn iced urd nat(cl a,aanier (osl wnaoi. vas�rnsers �na<kea toes nduie coaunons i�c }aaa :„ome,ga„ce (s1. stage tor) Stage / Discharge Elev (n) 5.00 4.00 3.00 2.00 1.00 0 00 496.50 495.50 494.50 493.50 492.50 491.50 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 Tntal Q Discharge (efs) SWM Facility Routed Hyd. No. 6 -- 10 Year i II�. Post Developed Uncontained Drainage Area Combined SWM Facility Routed and Uncontained DA Q(cfe> Q (cfs) Q (cfsj Q (cfs) Q (cfs) Hyd. No. 4 -• IQ Year Hyd. No, e -• 10 Year 3, UV 0. Vu 15.00 15.00 2.00 12.00 9,00 9.00 1.00 6,00 3.00 3.00 0 00 0 00 I O.V V. I.V, V V. 15.00 15.00 12-oa 12.00 9,00 9.00 6,00 6.00 3.00 3.00 o.00 o.ao 16.00 15.00 12.00 9.00 6.00 3.00 0.00 0.00 0 120 240 360 480 600 20 840 960 1080 1200 1$20 1440 1560 0 120 240 360 480 600 720 840 960' 1080 1200 1320 1440 1560 0 120 240 360 480 600 720 840 960 1080 1200' 1320 1440 1560 7. Time (min) Time (min) Time (min). --�- -Hyd No, 6 --- Hyd No. 3 :111 1 11..1 Total storage used .= 2,618 cult � ----�- Hyd No.4 '-u Hyd No, 8 --- Hyd No. 4 ---- Hyd No, 6 10 YR SWM POND ROUTING 10 YR POST - DEVELOPED UNCONTAINED 10 YR COMBINED SWM POND HYDROGRAPH ROUTING AND UNCONTAINED AREAS Short Version BMP Computations For Worksheets 2 - 6 Albemarle County Water Protection Ordinance: Modified Simple Method Plan;_ -_ B.F. Yancey_ElerneMary School Water Resource §Area_._,__ Rreparer: SAR - _- _. Date: 3-5-14 Project Drainage Area Designation TMtP 12BA2.22 _ R storm poilutwit expolt in pounds, L = [P(Pj)RW121 Rv mean nmetf coefficient, Rv = 0.05 + Q.00%0 P] small Storm correction factor, 0.9 I percent imperviousness R annual precipitation, 43" in Albernarle A project area in acres in subject drainage area; C pollutant concentration, mg/i or ppm target phosphorus f factor applied to RR v requiredtreatment,, dulmeincy, 0: 5" averimpem area = A0)43560(0.5f12y27 W required, removal , L(post) f x L(pfe) %,f3R removal: efficiency , W1001(post) t Po+tP�I V ooa� M9,1 rev, 30 May 2002 JIM 1 REVISED ROUTINGS USING TR -55 METHOD SAR 5 -8 -14 * DESIGNED BY: PROJECT: SET REV. NO. ITH 0 SAR B. F. YANCEY ELEMENTARY SCHOOL AM ENGINEERS DRAWN WASTEWATER TREATMENT IMPROVEMENTS EROSION & SEDIMENT CONTROL PLAN 1 SURVEYORS r AR ALBEMARLE COUNTY, VIRGINIA DRAWING NUMBER: PLANNERS TITLE: te. No., DIHR BY. STORMWATER MANAGEMENT ROUTINGS AND CALCULATIONS EC -10 Ito � .�' � �fi Po � °r 4t f9 3040 Aveinore Square Pt. SHEET NUMBER: ��, �'� Lynchbnrg,VA24502 Ch:vlotfesviile,VA22911 WWA NUMBER: FILE NAME: DISCIPLINE: SCALE: DATE: `�xONAL�'� Phone: f3- 1.316.6080 Phone: 434.9ti4.2700 CIVIL H: AS SHOWN 10 of 1 1 N0. SHEET REVISION BY DATE N0. SHEET REVISION BY DATE •N�N1 1 °°W.1y1 ° °SS °i °t.ndt 213003.04 300304C_SWM4.dwg V: N/A 3/13/14 Peak Discharge 2 YR Storm 10 YR Storm Pre - Developed Drainage Area 7,09 cfs 17.26 cfs Post- Developed Combined SWM Pond Routing and Uncontained Areas 7.07 cfs 16.20 cfs t Po+tP�I V ooa� M9,1 rev, 30 May 2002 JIM 1 REVISED ROUTINGS USING TR -55 METHOD SAR 5 -8 -14 * DESIGNED BY: PROJECT: SET REV. NO. ITH 0 SAR B. F. YANCEY ELEMENTARY SCHOOL AM ENGINEERS DRAWN WASTEWATER TREATMENT IMPROVEMENTS EROSION & SEDIMENT CONTROL PLAN 1 SURVEYORS r AR ALBEMARLE COUNTY, VIRGINIA DRAWING NUMBER: PLANNERS TITLE: te. No., DIHR BY. STORMWATER MANAGEMENT ROUTINGS AND CALCULATIONS EC -10 Ito � .�' � �fi Po � °r 4t f9 3040 Aveinore Square Pt. SHEET NUMBER: ��, �'� Lynchbnrg,VA24502 Ch:vlotfesviile,VA22911 WWA NUMBER: FILE NAME: DISCIPLINE: SCALE: DATE: `�xONAL�'� Phone: f3- 1.316.6080 Phone: 434.9ti4.2700 CIVIL H: AS SHOWN 10 of 1 1 N0. SHEET REVISION BY DATE N0. SHEET REVISION BY DATE •N�N1 1 °°W.1y1 ° °SS °i °t.ndt 213003.04 300304C_SWM4.dwg V: N/A 3/13/14 • i. • 9 M �Aq 2 0 MS-19 ANALYSIS DRAINAGE AREA DA=32.9 AC C=0.38 Tc=18.9 min. LEGEND DRAINAGEAREA kXIM" aw"M mv�� ox=w zwoma Culvert Report Hydraft 0w Express Extension for AutoCADO Civil 3DO 2012 by Autodesk, Inc. ruesday, May 6 2014 RWM4111�- - �-1 Invert Elev Dn (ft) = 491.50 Calculations Pipe Length (ft) = 189.90 Amin (cfs) = 8.91 Slope M = 5,.00 Qmax (cfs) = 14.42 Invert Elev Up (ft) = 501.00 Tailwater Elev (ft) = (dc+D)12 Rise (in) 24-0 Shape = Circular Highlighted Span (in) = 24.0 Q1 0= Ototal (cfs) = 10.91 No. Barrels = I Qpipe (cfs) = 10.91 n-Value = 0-010 Qovertop (cfs) = 0.00 Culvert Type = Circular Concrete Veloc Dn (ft/s) = 4.07 Culvert Entrance = Square edge w1headwall (C) Veloc Up (ft1s) = 5.64 Coeff. K,M,c,Y,k = 0.0098, 2, 0.0398, 0.67, 0.5 HGL Dn (ft) == 493.09 HGL Up (ft) = 502-18 Embankment Hw Elev (ft) = 502.75 Top Elevation (ft) = 504-00 Hw/D (ft) = 0.87 Top Width (ft) = 189.00 Flow Regime = Inlet Control Crest Width (ft) = 10.00 I jQZ393 sf or `9� A t,,� Wejqhted C imm MS-10 Drainacte Area DESCRFT" Q� FT. G FACta 112 Acre Lots 3K977 0.40 SGhoof 202t230: i 0.60 I WER I'm I= 13 I jQZ393 sf or `9� A t,,� Wejqhted C imm MS-10 Drainacte Area DESCRFT" Q� FT. G FACta 112 Acre Lots 3K977 0.40 SGhoof 202t230: i 0.60 I WER I'm I jQZ393 sf or `9� A t,,� Wejqhted C imm SET REV. NO. 1 SHEET NUMBER: 11 of 11 NNUMMI T�qW fime basedon WER . . . . . . . . . . . . . SET REV. NO. 1 SHEET NUMBER: 11 of 11