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RIVANNA SOLID WASTE AUTHORITY

SEDIMENT BASIN DESIGN DRAWINGS

4576 DICK WOODS ROAD

CHARLOTTESVILLE, VIRGINIA 22903

PREPARED BY:

SCS ENGINEERS

15521 MIDLOTHIAN TURNPIKE

SUITE 305

MIDLOTHIAN, VA 23113-7313

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ALBEMARLE COUNTY

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VIRGINIA

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VICINITY MAP

AutoCAD SHX Text LIST OF DRAWINGS 0 - COVER SHEET 1 - GENERAL NOTES AND ESC NOTES 2 - EXISTING CONDITIONS 3 - PRE-DEVELOPMENT CONDITIONS 4 - ESC PLAN 5 - ESC CALCS AND DETAILS 6 - ESC CALCS AND DETAILS 2 7 - POST DEVELOPMENT DESIGN 8 - FINAL GRADING 9 - BASIN DETAILS AND PROFILE

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AutoCAD SHX Text EROSION CONTROL NARRATIVE: PROJECT DESCRIPTION: THE IVY SOLID WASTE AND RECYCLING CENTER IS LOCATED IN CHARLOTTESVILLE, VA. THE IVY SOLID WASTE AND RECYCLING CENTER PROPERTY ENCOMPASSES APPROXIMATELY 297 ACRES, WHICH INCLUDES THE OLD WASTE DISPOSAL UNITS, THE CURRENT TRANSFER STATION, AND OTHER EXISTING OPERATIONS. THE SEDIMENT BASIN REFURBISHMENT PROJECT IS INTENDED TO REESTABLISH THE GRADE OF THE EXISTING SEDIMENT BASIN AND INSTALL NEW CONCRETE RISER AND BARREL STRUCTURES. THE PROJECT WILL ALSO ADDRESS EROSION ISSUES IN THE VICINITY OF THE SEDIMENT BASIN. THE SEDIMENT BASIN IS REGULATED UNDER THE RIVANNA SOLID WASTE AUTHORITY'S EXISTING VPDES PERMIT FOR INDUSTRIAL DISCHARGE, VAR050973. SOILS 36C HAYESVILLE LOAM, 7 TO 15 PERCENT SLOPES, GROUP B HAYESVILLE LOAM, 7 TO 15 PERCENT SLOPES, GROUP B 19B MINNIEVILLE LOAM, 2 TO 7 PERCENT SLOPES, GROUP B 36E HAYESVILLE LOAM, 25 TO 45 PERCENT SLOPES, GROUP B EXISTING CONDITIONS THE EXISTING PROJECT SITE IS LOCATED NORTH OF THE EXISTING CLOSED CELLS, WEST OF THE ACTIVE BORROW AREA, AND BEHIND THE EXISTING TREELINE. THE AREA SURROUNDING THE BASIN CONTAINS STEEPS SLOPES. ADJACENT AREAS THE PROPOSED PROJECT SHALL NOT DISTURB ANY OFF-SITE AREAS. NO OFFSITE BORROW SOIL IS ASSUMED TO BE NECESSARY FOR THIS PROJECT. GRAVEL TO BE USED FOR ROAD SURFACES. CRITICAL EROSION AREAS CRITICAL EROSION AREAS MAY BE ENCOUNTERED DURING GRADING OPERATIONS AS FOLLOWS: OUTLETS OF DRAINAGE SWALES OR CONVEYANCES EROSION AND SEDIMENT CONTROL MEASURES UNLESS OTHERWISE INDICATED, ALL VEGETATIVE AND STRUCTURAL EROSION AND SEDIMENT CONTROL PRACTICES SHALL BE CONSTRUCTED AND MAINTAINED ACCORDING TO THE MINIMUM STANDARDS AND SPECIFICATIONS OF THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK. LIST OF STRUCTURAL PRACTICES AND VESCH STD. & SPEC. NUMBER CONSTRUCTION ENTRANCE (CE) C-SCM-03-1 C-SCM-03-1 SILT FENCE WITH WIRE BACKING (SF) C-PCM-04-3 C-PCM-04-3 ROCK CHECK DAM (CD) C-SCM-07-1 C-SCM-07-1 OUTLET PROTECTION (OP) C-ECM-15 C-ECM-15 FILTER BAG C-SCM-10-4 C-SCM-10-4 SUMP PIT C-SCM-10-5 C-SCM-10-5 TREE PROTECTION AND PRESERVATION (TP) C-SSM-01-1 C-SSM-01-1 VEGETATIVE PRACTICES SURFACE ROUGHENING (SR) C-SSM-03 C-SSM-03 STABILIZATION BLANKETS (B/M) C-SSM-05 C-SSM-05 PERMANENT SEEDING C-SSM-10 C-SSM-10 MULCHING C-SSM-11 C-SSM-11 EROSION CONTROL SEQUENCE OF CONSTRUCTION PHASE I 1. CONTACT THE ALBEMARLE COUNTY ENVIRONMENTAL INSPECTOR TO CONTACT THE ALBEMARLE COUNTY ENVIRONMENTAL INSPECTOR TO SCHEDULE A PRE-CONSTRUCTION MEETING. A PRE-CONSTRUCTION MEETING WITH THE ENVIRONMENTAL INSPECTOR MUST OCCUR PRIOR TO ANY LAND DISTURBANCE ON THE SITE. IF CONSTRUCTION DOES NOT COMMENCE FOR 180 DAYS FOLLOWING THE PRE-CONSTRUCTION MEETING OR IF THE PROJECT IS DORMANT FOR 180 DAYS DURING THE CONSTRUCTION PHASE, A NEW PRE-CONSTRUCTION MEETING IS REQUIRED BEFORE CONSTRUCTION CAN RE-START. 2. FOLLOWING THE PRE-CONSTRUCTION MEETING, INSTALL ALL EROSION FOLLOWING THE PRE-CONSTRUCTION MEETING, INSTALL ALL EROSION CONTROL DEVICES LOCATED WITHIN THE LIMITS OF DISTURBANCE (SILT FENCE, CONSTRUCTION ENTRANCES). 3. AFTER THE ENVIRONMENTAL INSPECTOR HAS APPROVED THE PHASE 1 AFTER THE ENVIRONMENTAL INSPECTOR HAS APPROVED THE PHASE 1 EROSION CONTROL DEVICE INSTALLATION, PERFORM CLEARING & GRUBBING AND COMPLETE WORK AS INDICATED. 4. INSTALL PROPOSED ACCESS ROAD, GRADE PROPOSED CHANNELS, INSTALL INSTALL PROPOSED ACCESS ROAD, GRADE PROPOSED CHANNELS, INSTALL CHECK DAMS WITHIN PROPOSED CHANNELS, AND INSTALL PROPOSED TEMPORARY SEDIMENT TRAP. THESE PLANS CAN BE FOUND ON DRAWING NO. 3. 3. . PHASE II 1. CONDUCT REMAINING PROPOSED GRADING PER THE DESIGN. PLANS SHOWN CONDUCT REMAINING PROPOSED GRADING PER THE DESIGN. PLANS SHOWN ON DRAWING NO. 7 AND 8. 7 AND 8. AND 8. 8. . 2. INSTALL RIPRAP WITHIN STORMWATER CONVEYANCES AND STABILIZE INSTALL RIPRAP WITHIN STORMWATER CONVEYANCES AND STABILIZE DISTURBED AREAS IMMEDIATELY AFTER INSTALLATION. 3. INSTALL INLET PROTECTION AT NEWLY CONSTRUCTED INLETS AS THEY ARE INSTALL INLET PROTECTION AT NEWLY CONSTRUCTED INLETS AS THEY ARE INSTALLED. 4. DURING CONSTRUCTION INSPECT AND MAINTAIN AS NECESSARY ALL DURING CONSTRUCTION INSPECT AND MAINTAIN AS NECESSARY ALL EROSION CONTROL DEVICES IN ORDER TO MAINTAIN PROPER FUNCTION IN ACCORDANCE WITH THE VESCH. 5. STABILIZE SITE DURING AND AT THE CONCLUSION OF CONSTRUCTION PER STABILIZE SITE DURING AND AT THE CONCLUSION OF CONSTRUCTION PER VESCH STANDARDS. 6. NO EROSION AND SEDIMENT CONTROL MEASURES CAN BE REMOVED NO EROSION AND SEDIMENT CONTROL MEASURES CAN BE REMOVED WITHOUT APPROVAL OF THE ENVIRONMENTAL INSPECTOR FOR THE PROJECT. ESC MANAGEMENT STRATEGIES: 1. THE CONTRACTOR WILL DESIGNATE AN EMPLOYEE CERTIFIED AS THE THE CONTRACTOR WILL DESIGNATE AN EMPLOYEE CERTIFIED AS THE "RESONSIBLE LAND DISTURBER" (RLD), BY THE COMMONWEALTH OF VIRGINIA, DEPARTMENT OF ENVIRONMENTAL QUALITY (VADEQ), WHO IS IN CHARGE OF AND IS RESPONSIBLE FOR CARRYING OUT THE LAND-DISTURBING ACTIVITIES ON THIS PROJECT. THIS EMPLOYEE SHALL ALSO INSPECT FOR DEFICIENCIES IMMEDIATELY AFTER EACH RAINFALL, AT LEAST DAILY DURING PROLONGED RAINFALL, AND AT LEAST WEEKLY WHEN NO RAINFALL OCCURS. THE CONTRACTOR SHALL PROVIDE THE NAME OF THE RLD TO VADEQ PRIOR TO LAND DISTURBANCE. 2. AS A FIRST STEP MEASURE, SILT FENCE SHALL BE INSTALLED AS AS A FIRST STEP MEASURE, SILT FENCE SHALL BE INSTALLED AS INDICATED PRIOR TO UPSLOPE LAND DISTURBANCE. 3. STABILIZATION SHALL BE APPLIED TO EARTHEN STRUCTURES SUCH AS STABILIZATION SHALL BE APPLIED TO EARTHEN STRUCTURES SUCH AS DIVERSIONS IMMEDIATELY AFTER INSTALLATION. 4. INLET PROTECTION AS INDICATED ON THE PLAN SHALL BE INSTALLED FOR INLET PROTECTION AS INDICATED ON THE PLAN SHALL BE INSTALLED FOR NEW INLETS AS THEY BECOME OPERATIONAL. 5. ON-SITE STOCKPILES SHALL HAVE APPROPRIATE EROSION AND SEDIMENT ON-SITE STOCKPILES SHALL HAVE APPROPRIATE EROSION AND SEDIMENT CONTROL MEASURES, INCLUDING BUT NOT LIMITED TO VEGETATIVE STABILIZATION AND SILT FENCE. 6. AREAS THAT ARE NOT TO BE DISTURBED SHALL BE CLEARLY MARKED BY AREAS THAT ARE NOT TO BE DISTURBED SHALL BE CLEARLY MARKED BY FLAGS, SIGNS, ETC. 7. INSTALL ADDITIONAL ESC MEASURES IN ACCORDANCE WITH THE VESCH IF INSTALL ADDITIONAL ESC MEASURES IN ACCORDANCE WITH THE VESCH IF REQUIRED BY THE COUNTY INSPECTOR OR THE OWNER. 8. THE CONTRACTOR SHALL REMOVE ALL TEMPORARY EROSION AND THE CONTRACTOR SHALL REMOVE ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES WITHIN 30 DAYS AFTER FINAL SITE STABILIZATION OR AFTER TEMPORARY MEASURES ARE NO LONGER NEEDED, UNLESS OTHERWISE AUTHORIZED BY THE LOCAL ESC AND SWM ADMINISTRATOR. TRAPPED SEDIMENT AND THE DISTURBED SOIL AREAS RESULTING FROM THE DISPOSITION OF TEMPORARY MEASURES SHALL BE PERMANENTLY STABILIZED TO PREVENT FURTHER EROSION AND SEDIMENTATION. 9. GRADED PORTIONS OF THE SITE NOT TO BE CONSTRUCTED UPON OR GRADED PORTIONS OF THE SITE NOT TO BE CONSTRUCTED UPON OR LANDFILLED SHALL BE SEEDED WITHIN 30 DAYS OF FINAL GRADING OF THAT AREA. 10. WHEREVER POSSIBLE, NATURAL VEGETATION SHALL REMAIN INTACT TO WHEREVER POSSIBLE, NATURAL VEGETATION SHALL REMAIN INTACT TO AID IN EROSION CONTROL INSPECTIONS: THE RLD SHALL CONDUCT INSPECTIONS OF THE SITE AT A FREQUENCY OF AT LEAST ONCE EVERY FIVE BUSINESS DAYS AND NO LATER THAN 48 HOURS FOLLOWING A MEASURABLE STORM EVENT (0.25 INCHES). IN THE EVENT THAT A MEASURABLE STORM EVENT OCCURS WHEN THERE ARE MORE THAN 48 HOURS BETWEEN BUSINESS DAYS, THE INSPECTION SHALL BE CONDUCTED ON THE NEXT BUSINESS DAY. MAINTENANCE: 1. CONSTRUCTION ENTRANCE: MAINTAIN PER C-SCM-03-1. MAINTAIN IN A CONSTRUCTION ENTRANCE: MAINTAIN PER C-SCM-03-1. MAINTAIN IN A CONDITION TO PREVENT TRACKING TO FLOW OF MUD BEYOND THE SITE. PERIODIC TOP DRESSING WITH STONE, OR WASHING AND/OR REWORKING OF EXISTING STONE AS NECESSARY. REMOVE THE CE FOLLOWING CONSTRUCTION AS DIRECTED BY THE SPECIFICATIONS. 2. SILT FENCE WITH WIRE BACKING: MAINTAIN PER C-PCM-04-3. INSPECT SILT FENCE WITH WIRE BACKING: MAINTAIN PER C-PCM-04-3. INSPECT IMMEDIATELY AFTER EACH RAINFALL AND DURING PROLONG RAINFALL EVENTS. PERFORM REPAIRS CAUSED BY DAMAGED OR DEGRADED FABRIC OR POSTS IMMEDIATELY. REMOVE SEDIMENT DEPOSITS FOLLOWING STORM EVENTS EQUAL TO ONE-HALF THE HEIGHT OF THE BARRIER. REMOVE SILT FENCE FOLLOWING SITE STABILIZATION AND DISPOSE AS DIRECTED BY THE SPECIFICATIONS. 3. PERMANENT AND TEMPORARY SEEDING: MAINTAIN PER VESCH #3.32. PERMANENT AND TEMPORARY SEEDING: MAINTAIN PER VESCH #3.32. INSPECT AREAS OF TEMPORARY AND PERMANENT SEEDING UNTIL SUBSTATION VEGETATION IS ESTABLISHED. RE-SEED AND MULCH BARE SOIL AREAS AS NEEDED IN ACCORDANCE WITH THE SPECIFICATIONS.

AutoCAD SHX Text EROSION AND SEDIMENT CONTROL SITE NOTES: 1. LIMITS OF DISTURBANCE (LOD) ENCOMPASSES APPROXIMATELY 4.16 LIMITS OF DISTURBANCE (LOD) ENCOMPASSES APPROXIMATELY 4.16 ACRES. ALL CONSTRUCTION ACTIVITIES MUST REMAIN WITHIN THE LOD. 2. CONSTRUCTION ACCESS ROAD SHOULD BE CLEARED AND GRUBBED CONSTRUCTION ACCESS ROAD SHOULD BE CLEARED AND GRUBBED FIRST. ACCESS ROAD IS INTENDED AS THE SOLE ROAD TO ACCESS THE ENTIRE CONSTRUCTION PROJECT. STONE ENTRANCE TO BE INSTALLED PER NOTES. 3. TEMPORARY SEDIMENT TRAP HOLDS A VOLUME OF APPROXIMATELY TEMPORARY SEDIMENT TRAP HOLDS A VOLUME OF APPROXIMATELY 1900 CY. THIS WILL HOLD THE MINIMUM 134 CY/ACRE FOR THE 14 ACRES OF DRAINAGE AREA TO THE TEMPORARY SEDIMENT TRAP. IN ORDER TO ACCOMMODATE FOR THE LIMITED SPACE; THE TRAP SHOULD UTILIZE A PUMP TO REMOVE THE EXCESS STORMWATER FROM THE TRAP. THE PUMP WILL BE DISCHARGED ON THE OUTLET SIDE OF THE EXISTING SEDIMENT BASIN BERM THROUGH A FILTER BAG. 4. THE CHANNELS CALCULATIONS REPRESENT THE STEEPEST PORTION OF THE CHANNELS CALCULATIONS REPRESENT THE STEEPEST PORTION OF THE PROPOSED CHANNELS (33% SLOPE) AND THE FLATTEST PORTION OF THE PROPOSED CHANNELS (10%). SEE CHANNEL PROFILES ON DRAWING NO. 7). ALL THREE CHANNELS HAVE THE SAME DIMENSIONS. 10 YEAR AND 25 YEAR STORMS WERE SIMULATED FOR CAPACITY. 5. CHANNELS WILL BE LINED WITH RIPRAP DUE TO THE SLOPE AND CHANNELS WILL BE LINED WITH RIPRAP DUE TO THE SLOPE AND VELOCITY OF THE STORMWATER. CHANNELS WILL BE FIT WITH ROCK CHECK DAMS TO REDUCE FLOW VELOCITY. 6. ANY SLOPES THAT ARE CLEARED AND REGRADED FOR INSTALLATION ANY SLOPES THAT ARE CLEARED AND REGRADED FOR INSTALLATION OF THE ROAD AND STORMWATER CHANNELS SHALL BE MULCHED AND SEEDED UPON ACHIEVING FINAL GRADE. SLOPES SHALL RECEIVED EC-2 BLANKET MATTING. 7. THE LOD WAS DESIGNED TO LIMIT THE AMOUNT OF TREE CLEARING THE LOD WAS DESIGNED TO LIMIT THE AMOUNT OF TREE CLEARING AND GRUBBING NECESSARY. THE TREE PROTECTION AREAS OUTSIDE THE LOD SHALL NOT BE DISTURBED. THE NORTHERN MOST BOUNDARY OF THE LOD REPRESENTS A 100-FT BUFFER FROM THE CENTERLINE OF THE STREAM.

VIRGINIA MINIMUM STANDARDS FOR EROSION AND SEDIMENT CONTROL: PER 9VAC25-875-560: A VESCP MUST BE CONSISTENT WITH THE FOLLOWING CRITERIA, TECHNIQUES AND METHODS: A. AN EROSION AND SEDIMENT CONTROL PLAN CONSISTENT WITH THE FOLLOWING CRITERIA, TECHNIQUES, AND METHODS SHALL BE SUBMITTED TO THE VESMP AUTHORITY OR VESCP AUTHORITY FOR REVIEW AND APPROVAL: 1. PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN SEVEN DAYS AFTER FINAL GRADE IS REACHED ON ANY PORTION OF THE SITE. TEMPORARY SOIL STABILIZATION SHALL BE APPLIED WITHIN SEVEN DAYS TO DENUDED AREAS THAT MAY NOT BE AT FINAL GRADE BUT WILL REMAIN DORMANT FOR LONGER THAN 14 DAYS. PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR MORE THAN ONE YEAR. 2. DURING CONSTRUCTION OF THE PROJECT, SOIL STOCKPILES AND BORROW AREAS SHALL BE STABILIZED OR PROTECTED WITH SEDIMENT TRAPPING MEASURES. THE APPLICANT IS RESPONSIBLE FOR THE TEMPORARY PROTECTION AND PERMANENT STABILIZATION OF ALL SOIL STOCKPILES ON SITE AS WELL AS BORROW AREAS AND SOIL INTENTIONALLY TRANSPORTED FROM THE PROJECT SITE. 3. 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 IS UNIFORM, IS MATURE ENOUGH TO SURVIVE, AND WILL INHIBIT EROSION. 4. SEDIMENT BASINS AND TRAPS, PERIMETER DIKES, SEDIMENT BARRIERS, 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. 5. STABILIZATION MEASURES SHALL BE APPLIED TO EARTHEN STRUCTURES SUCH AS DAMS, DIKES, AND DIVERSIONS IMMEDIATELY AFTER INSTALLATION. 6. SEDIMENT TRAPS AND SEDIMENT BASINS SHALL BE DESIGNED AND CONSTRUCTED BASED UPON THE TOTAL DRAINAGE AREA TO BE SERVED BY THE TRAP OR BASIN. (A.) THE MINIMUM STORAGE CAPACITY OF A SEDIMENT TRAP SHALL BE 134 CUBIC YARDS PER ACRE OF DRAINAGE AREA AND THE TRAP SHALL ONLY CONTROL DRAINAGE AREAS LESS THAN THREE ACRES. (B.) SURFACE RUNOFF FROM DISTURBED AREAS THAT IS COMPRISED OF FLOW FROM DRAINAGE AREAS GREATER THAN OR EQUAL TO THREE ACRES SHALL BE CONTROLLED BY A SEDIMENT BASIN. THE MINIMUM STORAGE CAPACITY OF A SEDIMENT BASIN SHALL BE 134 CUBIC YARDS PER ACRE OF DRAINAGE AREA. THE OUTFALL SYSTEM SHALL, AT A MINIMUM, MAINTAIN THE STRUCTURAL INTEGRITY OF THE BASIN DURING A 25-YEAR STORM OF 24-HOUR DURATION. RUNOFF COEFFICIENTS USED IN RUNOFF CALCULATIONS SHALL CORRESPOND TO A BARE EARTH CONDITION OR THOSE CONDITIONS EXPECTED TO EXIST WHILE THE SEDIMENT BASIN IS UTILIZED. 7. CUT AND FILL SLOPES SHALL BE DESIGNED AND 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. 8. CONCENTRATED RUNOFF SHALL NOT FLOW DOWN CUT OR FILL SLOPES UNLESS CONTAINED WITHIN AN ADEQUATE TEMPORARY OR PERMANENT CHANNEL, FLUME, OR SLOPE DRAIN STRUCTURE. 9. WHENEVER WATER SEEPS FROM A SLOPE FACE, ADEQUATE DRAINAGE OR OTHER PROTECTION SHALL BE PROVIDED. 10. 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. 11. BEFORE NEWLY CONSTRUCTED STORMWATER 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. 12. 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. 13. 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 MATERIAL SHALL BE PROVIDED. 14. ALL APPLICABLE FEDERAL, STATE, AND LOCAL REQUIREMENTS PERTAINING TO WORKING IN OR CROSSING LIVE WATERCOURSES SHALL BE MET. 15. THE BED AND BANKS OF A WATERCOURSE SHALL BE STABILIZED IMMEDIATELY AFTER WORK IN THE WATERCOURSE IS COMPLETED. 16. 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.) EXCAVATED MATERIAL SHALL BE PLACED ON THE UPHILL SIDE OF TRENCHES. (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 OFF-SITE PROPERTY. (D.) MATERIAL USED FOR BACKFILLING TRENCHES SHALL BE PROPERLY COMPACTED IN ORDER TO MINIMIZE EROSION AND PROMOTE STABILIZATION. (E.) RESTABILIZATION SHALL BE ACCOMPLISHED IN ACCORDANCE WITH THIS CHAPTER. (F.) APPLICABLE SAFETY REQUIREMENTS SHALL BE COMPLIED WITH. 17. 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 SURFACE, THE ROAD SURFACE SHALL BE CLEANED THOROUGHLY AT THE END OF EACH DAY. SEDIMENT SHALL BE REMOVED FROM THE ROADS BY SHOVELING OR SWEEPING AND TRANSPORTED TO A SEDIMENT CONTROL 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. 18. ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES SHALL BE REMOVED WITHIN 30 DAYS AFTER FINAL SITE STABILIZATION OR AFTER THE TEMPORARY MEASURES ARE NO LONGER NEEDED, UNLESS OTHERWISE AUTHORIZED BY THE VESCP OR VESMP 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. 19. PROPERTIES AND WATERWAYS DOWNSTREAM FROM DEVELOPMENT SITES SHALL BE PROTECTED FROM SEDIMENT DEPOSITION, EROSION, AND DAMAGE DUE TO INCREASES IN VOLUME, VELOCITY, AND PEAK FLOW RATE OF STORMWATER RUNOFF FOR THE STATED FREQUENCY STORM OF 24-HOUR DURATION IN ACCORDANCE WITH THE FOLLOWING STANDARDS AND CRITERIA. STREAM RESTORATION AND RELOCATION PROJECTS THAT INCORPORATE NATURAL CHANNEL DESIGN CONCEPTS ARE NOT MANMADE CHANNELS AND SHALL BE EXEMPT FROM ANY FLOW RATE CAPACITY AND VELOCITY REQUIREMENTS FOR NATURAL OR MANMADE CHANNELS: (A.) CONCENTRATED STORMWATER RUNOFF LEAVING A DEVELOPMENT SITE SHALL BE DISCHARGED DIRECTLY INTO AN ADEQUATE NATURAL OR MANMADE RECEIVING CHANNEL, PIPE, OR STORM SEWER SYSTEM. FOR THOSE SITES WHERE RUNOFF IS DISCHARGED INTO A PIPE OR PIPE SYSTEM, DOWNSTREAM STABILITY ANALYSES AT THE OUTFALL OF THE PIPE OR PIPE SYSTEM SHALL BE PERFORMED. (B.) ADEQUACY OF ALL CHANNELS AND PIPES SHALL BE VERIFIED IN THE FOLLOWING MANNER: (1.) THE APPLICANT SHALL DEMONSTRATE THAT THE TOTAL DRAINAGE AREA TO THE POINT OF ANALYSIS WITHIN THE CHANNEL IS 100 TIMES GREATER THAN THE CONTRIBUTING DRAINAGE AREA OF THE PROJECT IN QUESTION; OR (2.)(a) NATURAL CHANNELS SHALL BE ANALYZED BY THE USE OF A TWO-YEAR STORM TO VERIFY THAT STORMWATER WILL NOT OVERTOP CHANNEL BANKS NOR CAUSE EROSION OF CHANNEL BED OR BANKS; (b) ALL PREVIOUSLY CONSTRUCTED MANMADE CHANNELS SHALL BE ANALYZED BY THE USE OF A 10-YEAR STORM TO VERIFY THAT STORMWATER WILL NOT OVERTOP THE STORMWATER'S BANKS AND BY THE USE OF A TWO-YEAR STORM TO DEMONSTRATE THAT STORMWATER WILL NOT CAUSE EROSION OF CHANNEL BED OR BANKS; AND (c) PIPES AND STORM SEWER SYSTEMS SHALL BE ANALYZED BY THE USE OF A 10-YEAR STORM TO VERIFY THAT STORMWATER WILL BE CONTAINED WITHIN THE PIPE OR SYSTEM. (C.) IF EXISTING NATURAL RECEIVING CHANNELS OR PREVIOUSLY CONSTRUCTED MANMADE CHANNELS OR PIPES ARE NOT ADEQUATE, THE APPLICANT SHALL: (1.) IMPROVE THE CHANNELS TO A CONDITION WHERE A 10-YEAR STORM WILL NOT OVERTOP THE BANKS AND A TWO-YEAR STORM WILL NOT CAUSE EROSION TO THE CHANNEL, THE BED, OR THE BANKS; (2.) IMPROVE THE PIPE OR PIPE SYSTEM TO A CONDITION WHERE THE 10-YEAR STORM IS CONTAINED WITHIN THE APPURTENANCES; (3.) DEVELOP A SITE DESIGN THAT WILL NOT CAUSE THE PREDEVELOPMENT PEAK RUNOFF RATE FROM A TWO-YEAR STORM TO INCREASE WHEN RUNOFF OUTFALLS INTO A NATURAL CHANNEL OR WILL NOT CAUSE THE PREDEVELOPMENT PEAK RUNOFF RATE FROM A 10-YEAR STORM TO INCREASE WHEN RUNOFF OUTFALLS INTO A MANMADE CHANNEL; OR (4.) PROVIDE A COMBINATION OF CHANNEL IMPROVEMENT, STORMWATER DETENTION, OR OTHER MEASURES THAT IS SATISFACTORY TO THE VESCP OR VESMP AUTHORITY TO PREVENT DOWNSTREAM EROSION. (D.) THE APPLICANT SHALL PROVIDE EVIDENCE OF PERMISSION TO MAKE THE IMPROVEMENTS. (E) ALL HYDROLOGIC ANALYSES SHALL BE BASED ON THE EXISTING WATERSHED CHARACTERISTICS AND THE ULTIMATE DEVELOPMENT CONDITION OF THE SUBJECT PROJECT. (F.) IF THE APPLICANT CHOOSES AN OPTION THAT INCLUDES STORMWATER DETENTION, THE APPLICANT SHALL OBTAIN APPROVAL FROM THE VESCP OR VESMP AUTHORITY FOR A PLAN FOR MAINTENANCE OF THE DETENTION FACILITIES. THE PLAN SHALL SET FORTH THE MAINTENANCE REQUIREMENTS OF THE FACILITY AND THE PERSON RESPONSIBLE FOR PERFORMING THE MAINTENANCE. (G.) OUTFALL FROM A DETENTION FACILITY SHALL BE DISCHARGED TO A RECEIVING CHANNEL, AND ENERGY DISSIPATORS SHALL BE PLACED AT THE OUTFALL OF ALL DETENTION FACILITIES AS NECESSARY TO PROVIDE A STABILIZED TRANSITION FROM THE FACILITY TO THE RECEIVING CHANNEL. (H.) ALL ONSITE CHANNELS MUST BE VERIFIED TO BE ADEQUATE. (I.) INCREASED VOLUMES OF SHEET FLOWS THAT MAY CAUSE EROSION OR SEDIMENTATION ON ADJACENT PROPERTY SHALL BE DIVERTED TO A STABLE OUTLET, ADEQUATE CHANNEL, PIPE, OR PIPE SYSTEM OR TO A DETENTION FACILITY. (J.) IN APPLYING THESE STORMWATER MANAGEMENT CRITERIA, INDIVIDUAL LOTS OR PARCELS IN A RESIDENTIAL, COMMERCIAL, OR INDUSTRIAL DEVELOPMENT SHALL NOT BE CONSIDERED TO BE SEPARATE DEVELOPMENT PROJECTS. INSTEAD, THE DEVELOPMENT AS A WHOLE SHALL BE CONSIDERED TO BE A SINGLE DEVELOPMENT PROJECT. HYDROLOGIC PARAMETERS THAT REFLECT THE ULTIMATE DEVELOPMENT CONDITION SHALL BE USED IN ALL ENGINEERING CALCULATIONS. (K.) ALL MEASURES USED TO PROTECT PROPERTIES AND WATERWAYS SHALL BE EMPLOYED IN A MANNER THAT MINIMIZES IMPACTS ON THE PHYSICAL, CHEMICAL, AND BIOLOGICAL INTEGRITY OF RIVERS, STREAMS, AND OTHER WATERS OF THE STATE. (L.) ANY PLAN APPROVED PRIOR TO JULY 1, 2014, THAT PROVIDES FOR STORMWATER MANAGEMENT THAT ADDRESSES ANY FLOW RATE CAPACITY AND VELOCITY REQUIREMENTS FOR NATURAL OR MANMADE CHANNELS SHALL SATISFY THE FLOW RATE CAPACITY AND VELOCITY REQUIREMENTS FOR NATURAL OR MANMADE CHANNELS IF THE PRACTICES ARE DESIGNED TO (I) DETAIN THE WATER QUALITY VOLUME AND TO RELEASE IT OVER 48 HOURS; (II) DETAIN AND RELEASE OVER A 24-HOUR PERIOD THE EXPECTED RAINFALL RESULTING FROM THE ONE YEAR, 24-HOUR STORM; AND (III) REDUCE THE ALLOWABLE PEAK FLOW RATE RESULTING FROM THE 1.5-YEAR, TWO-YEAR, AND 10-YEAR 24-HOUR STORMS TO A LEVEL THAT IS LESS THAN OR EQUAL TO THE PEAK FLOW RATE FROM THE SITE ASSUMING THE SITE WAS IN A GOOD FORESTED CONDITION, ACHIEVED THROUGH MULTIPLICATION OF THE FORESTED PEAK FLOW RATE BY A REDUCTION FACTOR THAT IS EQUAL TO THE RUNOFF VOLUME FROM THE SITE WHEN THE SITE WAS IN A GOOD FORESTED CONDITION DIVIDED BY THE RUNOFF VOLUME FROM THE SITE IN THE SITE'S PROPOSED CONDITION, AND SHALL BE EXEMPT FROM ANY FLOW RATE CAPACITY AND VELOCITY REQUIREMENTS FOR NATURAL OR MANMADE CHANNELS AS DEFINED IN ANY REGULATIONS PROMULGATED PURSUANT TO § 62.1-44.15:28 OF THE CODE OF VIRGINIA (VESMA) OR § 62.1-44.15:54 OR 62.1-44.15:65 OF THE CODE OF VIRGINIA (ESCL). (M.) FOR PLANS APPROVED ON AND AFTER JULY 1, 2014, THE FLOW RATE CAPACITY AND VELOCITY REQUIREMENTS OF § 62.1-44.15:52 A OF THE CODE OF VIRGINIA (ESCL) AND THIS SUBDIVISION 19 SHALL BE SATISFIED BY COMPLIANCE WITH WATER QUANTITY REQUIREMENTS IN THE VESMA AND ATTENDANT REGULATIONS, UNLESS SUCH LAND-DISTURBING ACTIVITIES (I) ARE IN ACCORDANCE WITH PROVISIONS FOR TIME LIMITS ON APPLICABILITY OF APPROVED DESIGN CRITERIA IN 9VAC25-875-480 OR GRANDFATHERING IN 9VAC25-875-490, IN WHICH CASE THE FLOW RATE CAPACITY AND VELOCITY REQUIREMENTS OF § 62.1-44.15:52 A OF THE CODE OF VIRGINIA (ESCL) SHALL APPLY; OR (II) ARE EXEMPT PURSUANT TO § 62.1-44.15:34 G 2 OF THE CODE OF VIRGINIA (VESMA). (N.) COMPLIANCE WITH THE WATER QUANTITY MINIMUM STANDARDS SET OUT IN 9VAC25-875-600 SHALL BE DEEMED TO SATISFY THE REQUIREMENTS OF THIS SUBDIVISION 19. B. ALL LAND-DISTURBING ACTIVITIES SHALL BE CONDUCTED IN A MANNER THAT IS CONSISTENT WITH THE APPLICABLE REQUIREMENTS OF SUBSECTION A OF THIS SECTION. STATUTORY AUTHORITY § 62.1-44.15:28 OF THE CODE OF VIRGINIA.62.1-44.15:28 OF THE CODE OF VIRGINIA.

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AutoCAD SHX Text NOTES: 1. TOPOGRAPHY IS BASED ON SURVEY DATA TOPOGRAPHY IS BASED ON SURVEY DATA CAPTURED BY DRAPER ADEN ASSOCIATES IN MARCH 2020. THIS TOPOGRAPHY IS BEING UTILIZED TO REPRESENT THE SITE'S PRE-DEVELOPMENT CONDITIONS FOR CALCULATION ASSUMPTIONS. THE DRAINAGE AREA IS BEING CHARACTERIZED AS GOOD CONDITION, FORESTED AREA FOR CONSERVATIVE ESTIMATION OF PRE-DEVELOPMENT CONDITIONS. 2. THIS DRAWING DOES NOT REPRESENT THIS DRAWING DOES NOT REPRESENT EXISTING CONDITIONS. CONTRACTOR SHOULD NOT UTILIZE PRE-DEVELOPMENT INFORMATION FOR BIDDING OR CONSTRUCTION ASSUMPTIONS. 3. SOIL BOUNDARIES AND SOIL TYPE SOIL BOUNDARIES AND SOIL TYPE CHARACTERIZATIONS ARE FROM CURRENT USGS SOIL MAPS.

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PRE-DEVELOPMENT STORMWATER INPUTS AND CALCULATIONS

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DRAINAGE AREA

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AREA (AC)

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CN

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OUTLET DESCRIPTION

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PEAK 2-YR STORM DISCHARGE (CFS)

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PEAK 5-YR STORM DISCHARGE (CFS)

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PEAK 10-YR STORM DISCHARGE (CFS)

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PEAK 25-YR STORM DISCHARGE (CFS)

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PEAK 100-YR STORM DISCHARGE (CFS)

AutoCAD SHX Text A

AutoCAD SHX Text 17.9

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OFF-SITE SHALLOW CONCENTRATED FLOW DISCHARGE

AutoCAD SHX Text 6.87

AutoCAD SHX Text 19.05

AutoCAD SHX Text 31.66

AutoCAD SHX Text 52.94

AutoCAD SHX Text 96.24

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FORESTED GROUND COVER FLOW DIRECTION

AutoCAD SHX Text LEGEND: PROPERTY BOUNDARY EXISTING MAJOR CONTOUR EXISTING MINOR CONTOUR SOIL TYPE BOUNDARY Tc FLOW PATH DRAINAGE AREA

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AutoCAD SHX Text 02225205.01

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AutoCAD SHX Text Ryan M. Mahon

AutoCAD SHX Text Lic. No. 065142

AutoCAD SHX Text 5/19/2026

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PROPOSED CONSTRUCTION ENTRANCE SEE DETAIL

AutoCAD SHX Text

DISCHARGE PUMP INTO FILTER BAG SEE DETAIL

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LIMITS OF DISTURBANCE 3.20 ACRES

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TREE PRESERVATION AND PROTECTION

AutoCAD SHX Text PERMANENT SEEDING, MULCHING, AND SURFACE ROUGHENING FOR SLOPE TIE IN STABILIZATION SEE REQUIREMENTS IN THE SPECIFICATIONS SECTION 02480

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PROPOSED BLANKET MATTING SEE DETAIL

AutoCAD SHX Text TRAP SHALL UTILIZE PUMP TO REMOVE EXCESS WATER AFTER A STORM EVENT. PUMP WILL DISCHARGE INTO A FILTER BAG SEE DETAIL

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PROPOSED CHECK DAM INSTALLED IN STORMWATER DISCHARGE AREA SEE DETAIL

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PROPOSED SILT FENCE WITH WIRE BACKING

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TREE PROTECTION AND PRESERVATION SEE DETAIL

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PROPOSED SILT FENCE WITH WIRE BACKING FOR BORROW AREA

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SURFACE ROUGHENING SEE DETAIL

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AutoCAD SHX Text 02225205.01

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AutoCAD SHX Text Ryan M. Mahon

AutoCAD SHX Text Lic. No. 065142

AutoCAD SHX Text 5/19/2026

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SCALE IN FEET

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AutoCAD SHX Text LEGEND: PROPERTY BOUNDARY EXISTING MAJOR CONTOUR 10' EXISTING MINOR CONTOUR 2' PROPOSED MAJOR CONTOUR 10' PROPOSED MINOR CONTOUR 2' EXISTING TREELINE EXISTING GRAVEL ROAD SILT FENCE TREE PROTECTION AND PRESERVATION PROPOSED TREELINE EDGE OF PROPOSED ACCESS ROAD LIMITS OF DISTURBANCE PUMP HOSE SILT FENCE (WITH WIRE BACKING) CHECK DAM PUMP AROUND DIVERSION CONSTRUCTION ENTRANCE PERMANENT SEEDING SURFACE ROUGHING MULCHING TREE PROTECTION AND PRESERVATION

AutoCAD SHX Text

AutoCAD SHX Text NOTES: 1. EXISTING CONTOURS WITHIN THE BOUNDARY, DENOTED EXISTING CONTOURS WITHIN THE BOUNDARY, DENOTED AS "2026 SURVEY", REPRESENT TOPOGRAPHY CAPTURED ON MARCH 3, 2026 BY PERKINS AND ORRISON USING UAV PHOTOGRAMMETRIC METHODS. HORIZONTAL DATUM BASED ON VIRGINIA STATE PLANE, SOUTH ZONE. VERTICAL DATUM BASED ON NAVD88. 2. THE AREA OF THE 2026 SURVEY REPRESENTS THE THE AREA OF THE 2026 SURVEY REPRESENTS THE GENERAL AREA FOR THE REFURBISHMENT PROJECT. 3. EXISTING CONTOURS OUTSIDE OF THE 2026 SURVEY EXISTING CONTOURS OUTSIDE OF THE 2026 SURVEY BOUNDARY REPRESENT SITE TOPOGRAPHY PROVIDED BY THE RIVANA SOLID WASTE AUTHORITY, CAPTURED BY AERIAL SURVEY ON MARCH 4, 2020 BY DRAPER ADEN ASSOCIATES. 4. SEE DRAWING NO. 1 FOR ESC NOTES. SEE DRAWING NO. 1 FOR ESC NOTES. 1 FOR ESC NOTES. FOR ESC NOTES. 5. SEE DRAWINGS 5 AND 6 FOR DETAILS. SEE DRAWINGS 5 AND 6 FOR DETAILS. 5 AND 6 FOR DETAILS. AND 6 FOR DETAILS. 6 FOR DETAILS. FOR DETAILS. 6. SEE SPECIFICATIONS SECTION 02480 FOR MULCHING, SEE SPECIFICATIONS SECTION 02480 FOR MULCHING, SEEDING, AND SURFACE ROUGHENING REQUIREMENTS

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AutoCAD SHX Text Ryan M. Mahon

AutoCAD SHX Text Lic. No. 065142

AutoCAD SHX Text 5/19/2026

AutoCAD SHX Text

STONE CONSTRUCTION ENTRANCE - DEQ DETAIL

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NOT TO SCALE

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SILT FENCE WITH WIRE SUPPORT - DEQ DETAIL

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BLANKET MATTING - DEQ DETAIL

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ROCK CHECK DAM - DEQ DETAIL

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FILTER BAG - DEQ DETAIL

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SUMP PIT - DEQ DETAIL

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TREE PROTECTION ADN PRESERVATION - DEQ DETAIL

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AutoCAD SHX Text NOTES: 1. ROCK CHECK DAMS INSTALLED IN CHANNEL CROSS SECTION SHOWN ON SHEET NO. 6. LENGTH WILL 6. LENGTH WILL . LENGTH WILL VARY BASED ON SLOPE. CHECK DAMS SHALL BE PLACED AT A MINIMUM OF 10 VERTICAL FEET. 2. ROCK CHECK DAMS SHALL BE VDOT #1 COARSE AGGREGATE

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SURFACE ROUGHENING - DEQ DETAIL

NOT TO SCALE

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START OF ROAD

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ROADSIDE CHANNEL DISCHARGES INTO TEMPORARY SEDIMENT TRAP

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ACCESS ROAD WITH ROADSIDE CHANNEL

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TIE INTO TEMPORARY SEDIMENT TRAP BERM

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TEMPORARY BERM

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BOTTOM ELEVATION OF SEDIMENT TRAP 576'

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12' MINIMUM

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3 MIN

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3 MIN

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MIN. 6" COMPACTED SUBGRADE SOIL

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MIN. 6" VDOT #21A STONE OR APPROVED ALTERNATE

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CROWN SLOPE VARIES

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ACCESS ROAD DETAIL

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8 OZ/SY NONWOVEN GEOTEXTILE

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SIDE-SLOPE VARIES AT TIE-IN

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PROPOSED GRADING

AutoCAD SHX Text NOTES: 1. CHANNEL BOTTOM WIDTH AND SLOPE VARIES BASED ON CHANNEL CHANNEL BOTTOM WIDTH AND SLOPE VARIES BASED ON CHANNEL

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AutoCAD SHX Text Ryan M. Mahon

AutoCAD SHX Text Lic.