W912LQ12B0002ESPlanB5A.pdf

BORROW SITE 5A

BENCHMARK - TOP

IRON PIN

ELEV=354.59

BENCHMARK - TOP

IRON PIN

ELEV=342.90

SHEET INDEX:

BORROW SITES B5A

MTC FORT PICKETT

DATEDATE

REVISIONS:

FIRST SUBMITTAL

DATE: 8/8/12

AREA OF DISTURBANCE:

TOTAL PROJECT AREA: 2.81 ACRES

1.38 ACRES

THIS PLAN ADDRESSES EROSION AND SEDIMENT CONTROL MEASURES ASSOCIATED WITH THE

PROPOSED BORROW SITE. NO BORROW ACTIVITY IS PROPOSED AT THIS TIME, BUT THIS PLAN IS

INTENDED TO PROVIDE A FRAMEWORK FOR PROJECT COMPLIANCE WHEN NECESSARY IN THE

FUTURE. THE CONTRIBUTING DRAINAGE AREA TO THE BORROW SITE IS APPROXIMATELY 1.71

ACRES AT OUTFALL 1 AND 0.40 AT OUTFALL 2. APPROXIMATELY 1.38 ACRES OF LAND

DISTURBANCE MAXIMUM ARE PROPOSED DURING THE BORROW ACTIVITIES.

600'200'0' 100'200' 400'

OWNER

SURVEYOR

ENGINEER

STATISTICAL DATA

WILLIAMSBURG ENVIRONMENTAL GROUP, INC.

5209 CENTER STREET

WILLIAMSBURG, VIRGINIA 23188

PHONE: (757) 220-6869

FAX: (757) 229-4507

ATTN: DANIEL PROCTOR, PE

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FAX: (434) 292-2901

BLACKSTONE, VA 23824

MTC FORT PICKETT BLDG T-232

COMMONWEALTH OF VA - DEPARTMENT OF MILITARY AFFAIRS

ATTN: DAVID SHORT

PHONE: (434) 292-2144

PROJECT LOCATION

1. COVER SHEET

2. EROSION AND SEDIMENT CONTROL PLAN PHASE I

3. EROSION AND SEDIMENT CONTROL PLAN PHASE II

4. EROSION AND SEDIMENT CONTROL NOTES AND DETAILS

5. HYDROLOGY

PROJECT NARRATIVE:

A VSMP GENERAL CONSTRUCTION PERMIT SHALL BE OBTAINED,

AND A STORMWATER POLLUTION PREVENTION PLAN PREPARED

PRIOR TO LAND DISTURBANCE WHEN APPLICABLE.

B&B CONSULTANTS, INC.

E. FERRELL STREET

SOUTH HILL, VA 23970

PHONE: (434) 447-7621

FAX: (434) 447-4257

ATTN: LARRY HARTSOE, L.S.

NOTE: ALL ELEVATIONS CONTAINED HEREIN ARE BASED ON THE

SITE TEMPORARY BENCHMARK IDENTIFIED ON THIS SHEET.

VERTICAL DATUM REFERENCED TO MEAN SEA LEVEL PER

NAVD 88, OR AS OTHERWISE NOTED ON PLANS.

EROSION AND SEDIMENT CONTROL PLAN

DINWIDDIE COUNTY, VIRGINIA

VICINITY MAP: 1'' = 2000'

SOURCE: USGS 7.5 MINUTE SERIES TOPOGRAPHY MAP,

BLACKSTONE EAST, VA QUADRANGLE, (1966, (REV 1978)).

LATITUDE: 37° 2' 38.23" N

LONGITUDE: 77° 55' 48.17" W

10/12/12 REVISED PER DCR COMMENTS

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BENCHMARK -

TOP IRON PIN

ELEV=354.59

352.5

352.5

352.5

1.71 AC

DA-1

0.4 AC

DA-2

353.5

TEMPORARY STOCKPILE

AREA AS NEEDED

CHECKED BY:

DESIGNED BY:

DAP

DAP

DRAWN BY:

SMS

DATE:

8/8/12

DATE:

REVISIONS:

JOB#: 4475

SHEET: 2

SCALE:

1 INCH = 20 FEET

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CONTOUR INTERVAL = 1 FOOT

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SOILS CHARACTERISTICS TABLE

NAME

SOURCE: MTC FORT PICKETT GIS

APPLING ASHLAR COMPLEX 7-15% SLOPES105C

SOIL

GROUP

HSG

B

EXISTING CONTOURS

LEGEND:

PROJECT LIMITS

PROPOSED CONTOURS

PROPOSED CONSTRUCTION

ENTRANCE

PROPOSED LIMITS OF

DISTURBANCE

SITE BENCHMARK

SURVEYED EDGE OF GRAVEL

ROAD

DRAINAGE AREA BOUNDARY

PROPOSED SILT FENCE

SOIL TYPE (TYP) G

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V ir g in ia

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(5 -5

TIME OF CONCENTRATION LINE (TC)

PRE

NOTE: ONLY ONE SOIL TYPE IN PROJECT AREA

CONSTRUCTION SEQUENCE PHASE I

1. INSTALL PERIMETER EROSION AND SEDIMENT CONTROLS PER THIS SHEET. STABILIZE

DIVERSION DIKE IMMEDIATELY AFTER INSTALLATION TO PREVENT EROSION.

2. STRIP TOPSOIL AND UNSUITABLE MATERIALS. PERFORM BORROW EXCAVATION.

STOCKPILE VARYING MATERIALS SEPARATELY.

3. IMMEDIATELY STABILIZE ALL DISTURBED AREAS WITH TEMPORARY SEEDING (OR

PERMANENT SEEDING WHEN FINAL GRADING IS ACHIEVED OR TO BE LEFT DORMANT

FOR MORE THAN 1 YEAR)

NOTE: GRADING SHOWN REFLECTS THE

MAXIMUM ANTICIPATED EXCAVATION

ASSOCIATED WITH THE BORROW ACTIVITY.

ACTUAL EXCAVATION MAY BE ADJUSTED IN

THE FIELD BASED ON QUANTITY AND/OR TYPE

OF MATERIAL NEEDED. DURING INTERIM

OPERATIONS BEFORE FINAL GRADES ARE

ACHIEVED, THE CONTRACTOR SHALL MAINTAIN

THE SAME DRAINAGE BREAKS SHOWN HEREIN

ALTHOUGH AT SLIGHTLY DIFFERENT

ELEVATIONS, ADDITIONAL TEMPORARY

CONTROLS SUCH AS SILT FENCE OR EXTENDED

DIVERSION DIKES MAY BE NECESSARY TO

ACCOMPLISH THIS.

NOTE: FOR PRE AND POST FLOWS, SEE

HYDROLOGIC SUMMARY ON SHEET 5

TS

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BENCHMARK -

TOP IRON PIN

ELEV=354.59

352.5

352.5

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1.71 AC

DA-1

0.4 AC

DA-2

353.5

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CHECKED BY:

DESIGNED BY:

DAP

DAP

DRAWN BY:

SMS

DATE:

8/8/12

DATE:

REVISIONS:

JOB#: 4475

SHEET: 3

SCALE:

1 INCH = 30 FEET

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90'30'0' 15'30' 60'

CONTOUR INTERVAL = 1 FOOT

P H

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CONSTRUCTION SEQUENCE PHASE I

1. INSTALL PERIMETER EROSION AND SEDIMENT CONTROLS PER THIS SHEET. STABILIZE

DIVERSION DIKE IMMEDIATELY AFTER INSTALLATION TO PREVENT EROSION.

2. STRIP TOPSOIL AND UNSUITABLE MATERIALS. PERFORM BORROW EXCAVATION.

STOCKPILE VARYING MATERIALS SEPARATELY.

3. IMMEDIATELY STABILIZE ALL DISTURBED AREAS WITH TEMPORARY SEEDING (OR

PERMANENT SEEDING WHEN FINAL GRADING IS ACHIEVED OR TO BE LEFT DORMANT

FOR MORE THAN 1 YEAR)

4. ONCE BORROW ACTIVITY IS COMPLETED, BRING SITE TO FINAL GRADE AND

STABILIZE.

5. APPLY MATTING TO CUT SLOPES.

6. WHEN FINAL STABILIZATION IS COMPLETE REMOVE SILT FENCE, AND ANY OTHER

REMAINING TEMPORARY EROSION AND SEDIMENT CONTROLS. APPLY PERMANENT

SEEDING TO DISTURBANCE FROM E&S CONTROL REMOVAL.

CONSTRUCTION SEQUENCE PHASE II

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EXISTING CONTOURS

LEGEND:

PROJECT LIMITS

PROPOSED EC-2 MATTING

PROPOSED CONSTRUCTION

ENTRANCE

SITE BENCHMARK

PROPOSED FLOW PATH

LIMITS OF DISTURBANCE

PROPOSED PHASE 2 GRADES

PROPOSED PHASE 1 GRADES

TIME OF CONCENTRATION LINE

(TC) POST

NOTE: GRADING SHOWN REFLECTS THE

MAXIMUM ANTICIPATED EXCAVATION

ASSOCIATED WITH THE BORROW ACTIVITY.

ACTUAL EXCAVATION MAY BE ADJUSTED IN

THE FIELD BASED ON QUANTITY AND/OR TYPE

OF MATERIAL NEEDED. DURING INTERIM

OPERATIONS BEFORE FINAL GRADES ARE

ACHIEVED, THE CONTRACTOR SHALL MAINTAIN

THE SAME DRAINAGE BREAKS SHOWN HEREIN

ALTHOUGH AT SLIGHTLY DIFFERENT

ELEVATIONS, ADDITIONAL TEMPORARY

CONTROLS SUCH AS SILT FENCE OR EXTENDED

DIVERSION DIKES MAY BE NECESSARY TO

ACCOMPLISH THIS.

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CHECKED BY:

DESIGNED BY:

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DAP

DRAWN BY:

SMS

DATE:

8/8/12

DATE:

REVISIONS:

JOB#: 4475

SHEET: 4

SCALE:

AS SHOWN

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NTS

DETAIL: STONE CONSTRUCTION ENTRANCE

12' MIN.

3' 5:1

SIDE ELEVATION

A6" MIN.

70' MIN.

OPERATION

OF INGRESS AND EGRESS

* MUST EXTEND FULL WIDTH

3" MIN.

3" MIN.

PLAN VIEW

SECTION A-A

ROADWAY

EXISTING

10' MIN.

A

(OPTIONAL)

MOUNTABLE BERM

ROADWAY

EXISTING

10' MIN.

10' MIN.

70' MIN.

FILTER CLOTH

EXISTING GROUND

12' MIN.

FILTER CLOTH

COURSE AGGREGATE

VDOT #1

4"

12"

SHALLOW

SLOPE

NETTING PROTECTIVE COVERINGS

MAY BE APPLIED ACROSS

THE SLOPE.

ON SHALLOW SLOPES, STRIPS

WHERE THERE IS A BERM AT THE TOP OF THE SLOPE,

BRING THE MATERIAL OVER THE BERM AND ANCHOR IT

BEHIND THE BERM.

BERM

ON STEEP SLOPES, APPLY

PROTECTIVE COVERING PARALLEL

TO THE DIRECTION OF FLOW

AND ANCHOR SECURELY.

STEEP

SLOPE

BRING MATERIAL DOWN TO A LEVEL AREA BEFORE

TERMINATING THE INSTALLATION. TURN THE END

UNDER 4" AND STAPLE AT 12" INTERVALS.

DITCH FLOW

IN DITCHES, APPLY PROTECTIVE COVERING

PARALLEL TO THE DIRECTION OF FLOW.

USE CHECK SLOTS AS REQUIRED. AVOID

JOINING MATERIAL IN THE CENTER OF

THE DITCH IF AT ALL POSSIBLE.

OF

DETAIL: EC-2 MATTING

NTS

PERMANENT SEEDING TEMPORARY SEEDING

NOTE:

CONTRACTOR MAY SELECT APPROPRIATE TEMPORARY SEED FROM THE LIST BELOW BASED ON TIME OF YEAR, TEMPORARY SEEDING IS ONLY NEEDED IF DISTURBED AREAS NOT YET AT FINAL GRADE WILL BE LEFT DORMANT FOR LONGER THAN 30 DAYS. PERMANENT SEEDING AND MULCHING SHALL BE USED IN ALL OTHER SITUATIONS

POINTS A SHOULD BE HIGHER THAN POINT B.

4. BACKFILL AND COMPACT3. STAPLE FILTER MATERIAL

2. EXCAVATE A 4" x 4" TRENCH

3' MAX.

FLOW

FLOW

CONSTRUCTION OF A SILT FENCE

(WITHOUT WIRE SUPPORT)

IT INTO THE TRENCH.

1. SET THE STAKES.

UPSLOPE ALONG THE LINE OF

STAKES.

TO STAKES AND EXTEND

SHEET FLOW INSTALLATION

THE EXCAVATED SOIL.

(PERSPECTIVE VIEW)

DRAINAGEWAY INSTALLATION

(FRONT ELEVATION)

A

FLOW

A

6' MAX.

SF

4"

B

DETAIL: SILT FENCE

NTS

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V ir g in ia

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(5 -5

EROSION AND SEDIMENT CONTROL NARRATIVE

EROSION AND SEDIMENT CONTROL NOTES

1. THE PURPOSE OF THE EROSION CONTROL MEASURES SHOWN ON THESE PLANS SHALL BE TO PRECLUDE THE TRANSPORT OF ALL WATERBORNE SEDIMENTS RESULTING FROM CONSTRUCTION ACTIVITIES FROM ENTERING ONTO ADJACENT PROPERTIES OR STATE WATERS. IF FIELD INSPECTION REVEALS THE INADEQUACY OF THE PLAN TO CONFINE SEDIMENT TO THE PROJECT SITE, APPROPRIATE MODIFICATIONS SHALL BE MADE TO CORRECT ANY PLAN DEFICIENCIES. IN ADDITION TO THESE NOTES, ALL PROVISIONS OF THE

VIRGINIA EROSION AND SEDIMENT CONTROL REGULATION SHALL APPLY TO THIS PROJECT.

2. WHERE CONSTRUCTION VEHICLE ACCESS ROUTES INTERSECT PAVED PUBLIC ROADS, PROVISIONS SHALL BE MADE TO MINIMIZE THE TRANSPORT OF SEDIMENT BY TRACKING ONTO THE PAVED SURFACE. WHERE SEDIMENT IS TRANSPORTED ONTO A PUBLIC ROAD SURFACE, THE ROAD 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 DISPOSAL AREA.

3. ALL EROSION AND SEDIMENT CONTROL MEASURES SHALL BE INSTALLED AND MAINTAINED IN ACCORDANCE WITH THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK, THIRD EDITION, 1992 . THE CONTRACTOR SHALL BE THOROUGHLY FAMILIAR WITH ALL

APPLICABLE MEASURES CONTAINED THEREIN WHICH MAY BE PERTINENT TO THIS PROJECT.

4. ALL APPLICABLE FEDERAL, STATE AND LOCAL REGULATIONS PERTAINING TO WORKING IN OR CROSSING A LIVE WATERCOURSE SHALL

BE MET.

5. PERIODIC INSPECTIONS OF ALL EROSION CONTROL MEASURES SHALL BE MADE BY THE CONTRACTOR TO ASSESS THEIR CONDITION.

INSPECTIONS SHALL BE CONDUCTED AT LEAST ONCE EVERY 14 CALENDAR DAYS AND WITHIN 48 HOURS FOLLOWING ANY RUNOFF PRODUCING STORM EVENT OR EVERY 7 CALENDAR DAYS REGARDLESS OF WEATHER . THIS INCLUDES INSPECTION AFTER EVERY ERODIBLE RAINFALL EVENT AND THE REPAIR OF MEASURES DAMAGED BY SUB-CONTRACTORS. ANY NECESSARY REPAIRS OR CLEAN UP TO MAINTAIN THE EFFECTIVENESS OF THE EROSION CONTROL DEVICES SHALL BE MADE IMMEDIATELY.

6. SEDIMENT CONTROL MEASURES MAY REQUIRE MINOR FIELD ADJUSTMENTS AT THE TIME OF CONSTRUCTION TO INSURE THEIR INTENDED PURPOSE IS ACCOMPLISHED. APPROVAL BY THE ENGINEER OR SITE INSPECTOR WILL BE REQUIRED FOR ANY DEVIATIONS

FROM THE APPROVED PLANS.

7. ADDITIONAL EROSION CONTROL DEVICES MAY BE REQUIRED BY THE STATE INSPECTOR, ENGINEER, OWNER, OR HIS DESIGNATED

AGENT IF DEEMED NECESSARY.

8. ALL EROSION CONTROL DEVICES SHALL BE IN PLACE AND FUNCTIONAL AT ALL TIMES AND IF REMOVED FOR CONSTRUCTION

PROGRESS, SHALL BE REPLACED BY THE CLOSE OF EACH WORKDAY.

9. SURFACE FLOWS OVER CUT AND FILL SLOPES SHALL BE CONTROLLED BY EITHER REDIRECTING FLOWS FROM TRANSVERSING THE SLOPES OR BY INSTALLING MECHANICAL DEVICES TO SAFELY LOWER WATER DOWNSLOPE WITHOUT CAUSING EROSION.

10. THE CONTRACTOR SHALL PLACE SOIL STOCKPILES AT THE LOCATIONS SHOWN ON THIS PLAN OR AS DIRECTED BY THE ENGINEER.

SOIL STOCKPILES SHALL BE STABILIZED OR PROTECTED WITH SEDIMENT TRAPPING MEASURES. OFF-SITE WASTE OR BORROW AREAS SHALL BE APPROVED PRIOR TO THE IMPORT OF ANY BORROW OR EXPORT OF ANY WASTE TO OR FROM THE PROJECT SITE.

11. ALL SLOPES STEEPER THAN 3:1 SHALL REQUIRE THE USE OF EROSION CONTROL BLANKETS TO AID IN THE ESTABLISHMENT OF A VEGETATIVE COVER. INSTALLATION SHALL BE IN ACCORDANCE WITH SPECIFICATION 3.36 (B/M) AND MANUFACTURER'S INSTRUCTIONS.

NO SLOPES SHALL BE CREATED STEEPER THAN 2:1.

12. THE CONTRACTOR SHALL COMPLETE DRAINAGE FACILITIES WITHIN 30 DAYS FOLLOWING COMPLETION OF ROUGH GRADING AT ANY POINT WITHIN THE PROJECT. OUTFALL CHANNELS FROM DRAINAGE STRUCTURES SHALL BE STABILIZED IMMEDIATELY AFTER CONSTRUCTION OF SAME. THIS INCLUDES INSTALLATION OF EROSION CONTROL STONE OR PAVED DITCHES WHERE REQUIRED.

13. PERMANENT OR TEMPORARY SOIL STABILIZATION MUST BE APPLIED TO ALL DENUDED AREAS WITHIN 7 DAYS AFTER FINAL GRADE IS REACHED ON ANY PORTION OF THE SITE. SOIL STABILIZATION MUST ALSO BE APPLIED TO DENUDED AREAS WHICH MAY NOT BE AT FINAL GRADE BUT WILL REMAIN DORMANT (UNDISTURBED) FOR LONGER THAN 30 DAYS. SOIL STABILIZATION MEASURES INCLUDE

VEGETATIVE ESTABLISHMENT OR MULCHING.

14. IF DISTURBED AREA STABILIZATION IS TO BE ACCOMPLISHED DURING THE MONTHS OF DECEMBER, JANUARY, OR FEBRUARY, STABILIZATION SHALL CONSIST OF MULCHING IN ACCORDANCE WITH SPECIFICATION 3.35 OF THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK THIRD EDITION, 1992 . SEEDING WILL THEN TAKE PLACE AS SOON AS THE SEASON PERMITS.

15. THE TERM SEEDING, FINAL VEGETATIVE COVER OR STABILIZATION, ON THIS PLAN SHALL MEAN THE SUCCESSFUL GERMINATION AND ESTABLISHMENT OF A STABLE COVER FROM A PROPERLY PREPARED SEEDBED CONTAINING THE SPECIFIED AMOUNTS OF SEED AND

FERTILIZER IN ACCORDANCE WITH THE SEEDING SCHEDULE LOCATED ON THIS SHEET.

16. TEMPORARY EROSION CONTROL MEASURES ARE NOT TO BE REMOVED UNTIL ALL DISTURBED AREAS ARE STABILIZED. AFTER STABILIZATION IS COMPLETE, ALL MEASURES SHALL BE REMOVED WITHIN 30 DAYS. TRAPPED SEDIMENT SHALL BE SPREAD AND

SEEDED.

PROJECT DESCRIPTION

THIS PLAN ADDRESSES EROSION AND SEDIMENT CONTROL MEASURES ASSOCIATED WITH THE PROPOSED BORROW SITE. THIS PLAN IS INTENDED TO PROVIDE A FRAMEWORK FOR PROJECT COMPLIANCE WHEN NECESSARY BORROW ACTIVITY TAKES PLACE IN THE FUTURE.

THE PROPOSED PROJECT AREA IS APPROXIMATELY 2.81 ACRES WITH A MAXIMUM ANTICIPATED AREA OF DISTURBANCE OF 1.38 ACRES.

EXISTING CONDITIONS

EXISTING CONDITIONS CONSIST OF OPEN AREAS AND AN EXISTING PAVED ROAD TO THE WEST.

ADJACENT AREAS

ADJACENT ROADWAYS WILL BE PROTECTED THROUGH THE USE OF A CONSTRUCTION ENTRANCES. DOWNSTREAM CHANNELS WILL BE PROTECTED BY PROPOSED E&S MEASURES AS SPECIFIED ON SHEET 2 AND 3, MAINLY CONSISTING OF SILT FENCE AND/OR A

TEMPORARY SEDIMENT TRAP.

OFF-SITE AREAS

THIS PROJECT IS INTENDED TO SERVE AS AN OFFSITE BORROW SITE FOR ANOTHER PROJECT UNDETERMINED AT THIS TIME. A SEPARATE EROSION AND SEDIMENT CONTROL PLAN SHALL BE PROVIDED FOR ANY ACTIVITIES OUTSIDE THE PROJECT LIMITS SHOWN IN THESE

PLANS.

SOILS

A SOILS TABLE HAS BEEN PROVIDED ON SHEET 2 OF THIS PLAN SET. THE PROJECT AREA IS GENERALLY CHARACTERIZED BY TYPE "B" APPLING ASHLAR COMPLEX 7-15% SLOPES ADDITIONAL GEOTECHNICAL INFORMATION HAS BEEN PROVIDED BY BLUE RIDGE

GEOTECHNICAL, LLC.

CRITICAL AREAS

CRITICAL AREAS INCLUDE DOWNSTREAM RECEIVING STREAM CHANNELS AND SLOPES WHERE SHEET FLOW EXCEEDS 150 FEET IN LENGTH WHICH COULD POTENTIALLY LEAD TO RILL AND GULLY EROSION. THESE BORROW AREAS WILL BE PROTECTED WITH EROSION AND SEDIMENT CONTROL MEASURES AS SHOWN ON SHEET 2, AND FINAL SITE REHABILITATION WILL RESTORE THE PROJECT AREA TO

STABLE CONDITIONS CONSISTENT WITH PRE-CONSTRUCTION STATE.

PERMANENT STORMWATER CONSIDERATIONS

THE ULTIMATE OUTFALL FOR THE PROPOSED SPOIL SITE IS LOCATED IN THE NORTHWESTAND SOUTH EAST EDGES OF THE PROJECT SITE.

THE SITE WILL BE FULLY STABILIZED WITH PERMANENT SEEDING UPON COMPLETION OF SPOIL ACTIVITY. THE PROPOSED BORROW ACTIVITIES WILL NOT INCREASE FLOWS AT THE SITE OUTFALL. ALL RUNOFF LEAVING THE PROJECT DISTURBANCE IS EXPECTED TO BE

SHEET FLOW

STRUCTURAL PRACTICES

UNLESS OTHERWISE INDICATED, ALL VEGETATIVE AND STRUCTURAL EROSION AND SEDIMENT CONTROL PRACTICES SHALL BE CONSTRUCTED AND MAINTAINED ACCORDING TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK, THIRD EDITION, 1992 . THE MINIMUM STANDARDS OF THE VIRGINIA EROSION AND SEDIMENT CONTROL REGULATIONS, LATEST EDITION SHALL BE ADHERED TO UNLESS OTHERWISE WAIVED OR APPROVED BY A VARIANCE, IN WRITING.

1. TEMPORARY STONE CONSTRUCTION ENTRANCE - STD. & SPEC. 3.02 - CONSTRUCTION ENTRANCES SHALL BE EMPLOYED TO REDUCE THE AMOUNT OF MATERIAL TRANSPORTED OFF-SITE BY CONSTRUCTION VEHICLES. THE CONSTRUCTION ENTRANCES SHALL BE MAINTAINED AT THE LOCATION SHOWN ON SHEET 2 FOR THE DURATION OF THE CONSTRUCTION AND STABILIZATION.

2. SILT FENCE - STD. & SPEC. 3.05 - SILT FENCE SHALL BE PLACED AS SHOWN IN THESE PLANS TO PREVENT SEDIMENT TRANSPORT

OFFSITE.

3. DIVERSION DIKES - STD. & SPEC. 3.09

TEMPORARY DIVERSION DIKES SHALL BE USED TO DIRECT FLOW TO THE TEMPORARY SEDIMENT TRAP.

4. TEMPORARY SEDIMENT TRAP - STD. & SPEC. 3.13 - A TEMPORARY SEDIMENT TRAP SHALL BE USED TO PREVENT THE FLOW OF

SEDIMENT AWAY FROM THE CONSTRUCTION AREA.

5. STORMWATER CONVEYANCE CHANNEL - STD. & SPEC. 3.17 - A STORMWATER CONVEYANCE CHANNEL SHALL BE USED TO BREAK UP

SHEET FLOW AND PREVENT RILL EROSION.

6. OUTLET PROTECTION - STD. & SPEC. 3.18 - OPTLET PROTECTION WILL BE USED AT THE PIPE OUTFALL TO PREVENT EROSION OF THE

DOWNSTREAM CHANNEL.

7. SOIL STABILIZATION BLANKETS AND MATTING - STD. & SPEC. 3.36

STABILIZATION MATTING SHALL BE IMMEDIATELY APPLIED TO ALL DISTURBED SLOPES UPON COMPLETION OF CONSTRUCTION.

NON-STRUCTURAL PRACTICES

1. TEMPORARY SEEDING - STD. & SPEC. 3.31 - ALL EXPOSED SOIL SURFACES THAT ARE NOT TO BE FINE-GRADED FOR PERIODS LONGER THAN 30 DAYS SHALL RECEIVE TEMPORARY SEEDING. SELECTION OF THE TEMPORARY SEED MIXTURE SHALL BE IN ACCORDANCE WITH THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK, THIRD EDITION, 1992 AS REFERENCED ON THIS SHEET.

2. PERMANENT SEEDING - STD. & SPEC. 3.32 - PERMANENT SEEDING SHALL BE USED TO STABILIZE DISTURBED AREAS BROUGHT TO FINAL GRADE BY ESTABLISHING PERENNIAL VEGETATIVE COVER. SELECTION OF THE PERMANENT SEED MIXTURE SHALL BE IN ACCORDANCE WITH THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK, THIRD EDITION, 1992 AS REFERENCED ON THIS SHEET.

3. MULCHING - STD. & SPEC. 3.35 - AREAS WHICH HAVE BEEN PERMANENTLY OR TEMPORARILY SEEDED SHOULD BE MULCHED IMMEDIATELY FOLLOWING SEEDING. MULCHING SHALL BE USED IN FALL FOR WINTER COVER AND DURING HOT AND DRY SUMMER

MONTHS.

MAINTENANCE PRACTICES

IN GENERAL, ALL EROSION AND SEDIMENT CONTROL MEASURES SHALL BE CHECKED DAILY AND AFTER EACH SIGNIFICANT RAINFALL BY

THE CONTRACTOR. THE FOLLOWING ITEMS WILL BE CHECKED IN PARTICULAR:

3.02 - TEMPORARY STONE CONSTRUCTION ENTRANCE - THE ENTRANCES SHALL BE MAINTAINED IN A CONDITION WHICH WILL PREVENT TRACKING OR FLOW OF MUD ONTO PUBLIC RIGHTS-OF-WAY. THIS MAY REQUIRE PERIODICALLY TOPDRESSING THE ENTRANCE WITH

ADDITIONAL STONE OR WASHING THE EXISTING STONE.

3.03 - CONSTRUCTION ROAD STABILIZATION - BOTH TEMPORARY AND PERMANENT ROADS MAY REQUIRE PERIODIC TOP DRESSING WITH NEW GRAVEL. SEEDED AREAS ADJACENT TO THE ROADS SHOULD BE CHECKED PERIODICALLY TO ENSURE THAT A VIGOROUS STAND OF

VEGETATION IS MAINTAINED.

3.05 - SILT FENCE - SILT FENCE SHALL BE INSPECTED IMMEDIATELY AFTER EACH RAINFALL AND AT LEAST DAILY DURING PROLONGED RAINFALL. ANY REQUIRED REPAIRS SHALL BE MADE IMMEDIATELY. CLOSE ATTENTION SHALL BE PAID TO THE REPAIR OF DAMAGED SILT FENCE RESULTING FROM END RUNS AND UNDERCUTTING. SHOULD THE FABRIC ON A SILT FENCE DECOMPOSE OR BECOME INEFFECTIVE PRIOR TO THE END OF THE EXPECTED USABLE LIFE AND THE BARRIER STILL BE NECESSARY, THE FABRIC SHALL BE REPLACED PROMPTLY. SEDIMENT DEPOSITS SHOULD BE REMOVED AFTER EACH STORM EVENT. THEY MUST BE REMOVED WHEN DEPOSITS REACH APPROXIMATELY ONE-HALF THE HEIGHT OF THE BARRIER. ANY SEDIMENT DEPOSITS REMAINING IN PLACE AFTER THE SILT FENCE IS NO LONGER REQUIRED SHALL BE DRESSED TO CONFORM WITH THE EXISTING GRADE, PREPARED AND SEEDED.

3.09 - TEMPORARY DIVERSION DIKE - THE MEASURE SHALL BE INSPECTED AFTER EVERY STORM AND REPAIRS MADE TO THE DIKE, FLOW CHANNEL, OUTLET OR SEDIMENT TRAPPING FACILITY, AS NECESSARY. ONCE EVERY TWO WEEKS, WHETHER A STORM EVENT HAS OCCURRED OR NOT, THE MEASURE SHALL BE INSPECTED AND REPAIRS MADE IF NEEDED. DAMAGES CAUSED BY CONSTRUCTION

TRAFFIC OR OTHER ACTIVITY MUST BE REPAIRED BEFORE THE END OF EACH WORKING DAY.

3.13 - TEMPORARY SEDIMENT TRAP - SEDIMENT SHALL BE REMOVED AND THE TRAP RESTORED TO ITS ORIGINAL DIMENSIONS WHEN THE SEDIMENT HAS ACCUMULATED TO ONE HALF THE DESIGN VOLUME OF THE WET STORAGE. STONE IN THE SPILLWAY THAT IS CHOKED

WITH SEDIMENT SHALL BE REMOVED AND CLEANED OR REPLACED. THE TRAP SHOULD BE CHECKED REGULARLY TO ENSURE THAT IT IS STRUCTURALLY SOUND. THE TRAP SHALL BE CHECKED AFTER EACH RAINFALL EVENT FOR SEDIMENT CLEANOUT. WHEN THE SEDIMENT REACHES THE CLEANOUT LEVEL, THE SEDIMENT SHALL BE REMOVED AND PROPERLY DISPOSED OF.

3.17 - STORMWATER CONVEYANCE CHANNEL - DURING INITIAL ESTABLISHMENT, GRASS LINED CHANNELS SHOULD BE REPAIRED IMMEDIATELY AND GRASS RE-ESTABLISHED AREAS IF NECESSARY. AFTER GRASS HAS BECOME ESTABLISHED, THE CHANNEL SHOULD BE CHECKED PERIODICALLY TO DETERMINE IF THE GRASS IS WITHSTANDING THE FLOW VELOCITIES WITHOUT DAMAGE. IF THE CHANNEL

IS TO BE MOWED, IT SHOULD BE DONE IN A MANNER THAT WILL NOT DAMAGE THE GRASS.

3.18 - OUTLET PROTECTION - ONCE RIPRAP INSTALLATION HAS BEEN COMPLETED, IT SHOULD REQUIRE VERY LITTLE MAINTENANCE. IT SHOULD, HOWEVER, BE INSPECTED PERIODICALLY TO DETERMINE IF HIGH FLOWS HAVE CAUSED SCOUR BENEATH THE RIPRAP OR FILTER FABRIC OR DISLODGED ANY OF THE STONE. CARE MUST BE TAKEN TO PROPERLY CONTROL SEDIMENT-LADEN RUNOFF WHICH MAY DRAIN TO THE POINT OF THE NEW INSTALLATION. IF REPAIRS ARE NEEDED, THEY SHOULD BE ACCOMPLISHED IMMEDIATELY.

3.36 - BLANKETING AND MATTING - ALL SOIL STABILIZATION BLANKETS AND MATTING SHOULD BE INSPECTED PERIODICALLY FOLLOWING INSPECTION, PARTICULARLY AFTER RAIN STORMS TO CHECK FOR EROSION AND UNDERMINING. ANY DISLOCATION OR FAILURE SHOULD ME REPAIRED IMMEDIATELY. IF WASHOUTS OR BREAKAGE OCCURS, REINSTALL THE MATERIAL AFTER REPAIRING DAMAGE TO SLOPE OR DITCH. CONTINUE TO MONITOR THESE AREAS UNTIL WHICH THEY BECOME PERMANENTLY STABILIZED; AT THAT TIME AN ANNUAL

INSPECTION SHOULD BE ADEQUATE.

EROSION AND SEDIMENT CONTROL MINIMUM STANDARDS

THE INTENT OF THIS SECTION IS TO SUMMARIZE HOW THE EROSION AND SEDIMENT CONTROL MEASURES PROPOSED IN THE EROSION AND SEDIMENT CONTROL PLAN SATISFY THE 19 MINIMUM STANDARDS SET FORTH IN THE VIRGINIA EROSION AND SEDIMENT CONTROL REGULATIONS (4VAC50-30-40). THE FOLLOWING IS A BRIEF SYNOPSIS OF THE MINIMUM STANDARDS (MS) AND HOW THEY ARE

ADDRESSED IN THE PLAN:

MS-1 STABILIZATION OF DENUDED AREAS - WITHIN SEVEN DAYS, PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS THAT MAY REMAIN DORMANT FOR LONGER THAN 30 DAYS. TEMPORARY AND PERMANENT SEEDING, MULCHING, BLANKETS AND MATTING, AND RIPRAP ARE SPECIFIED IN THE PLAN FOR STABILIZATION OF DENUDED AREAS.

MS-2 STABILIZATION OF SOIL STOCKPILES - DURING CONSTRUCTION, SOIL STOCKPILES AND BORROW AREAS SHALL BE STABILIZED OR

PROTECTED WITH SEDIMENT TRAPPING MEASURES, (SEDIMENT TRAP).

MS-3 ESTABLISHMENT OF PERMANENT VEGETATION - 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, MATURE ENOUGH TO SURVIVE, AND WILL INHIBIT EROSION.

MS-4 TIMING AND STABILIZATION OF SEDIMENT TRAPPING MEASURES - ALL SEDIMENT TRAPPING MEASURES (INCLUDING SEDIMENT TRAP) 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 IMMEDIATELY

AFTER INSTALLATION AS SPECIFIED IN THE PLAN.

MS-6 SEDIMENT TRAP AND BASINS - SEDIMENT BASINS ARE NOT USED IN THIS PLAN. THE SEDIMENT TRAP SHALL CONTROL DRAINAGE AREAS LESS THAN TO THREE ACRES. THE MINIMUM STORAGE CAPACITY SHALL BE 134 CUBIC YARDS PER ACRE OF DRAINAGE AREA.

MS-7 DESIGN, CONSTRUCTION, AND STABILIZATION OF CUT AND FILL SLOPES - CUT AND FILL SLOPES SHALL BE DESIGNED AND CONSTRUCTED IN A MANNER THAT WILL MINIMIZE EROSION. MOST SLOPES ARE PROPOSED TO BE STABILIZED WITH BLANKETING AND MATTING AS SHOWN ON THE E&S PLAN. SLOPES 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 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 ADEQUATE DRAINAGE PROTECTION FROM WATER SEEPS - IF THE CONTRACTOR IDENTIFIES WATER SEEPAGE FROM A SLOPE FACE, ADEQUATE DRAINAGE PER VESCH 3.28 OR OTHER APPROPRIATE PROTECTION SHALL BE PROVIDED.

MS-10 STORM SEWER INLET PROTECTION - NOT APPLICABLE FOR THIS PLAN SINCE THERE ARE NO STORM SEWER INLETS AFFECTED BY

THE PROPOSED CONSTRUCTION.

MS-11 STORMWATER CONVEYANCE PROTECTION - 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.

MS-12 WORK IN LIVE WATERCOURSE - THERE ARE NO WATERCOURSES LOCATED WITHIN THE PROJECT AREA.

MS-13 CROSSING LIVE WATERCOURSE - NONE OF THE PROPOSED SPOIL ACTIVITY IS EXPECTED TO CROSS A LIVE WATERCOURSE.

MS-14 REGULATION OF WATERCOURSE CROSSING - NO IMPACTS TO WATERCOURSES ARE ANTICIPATED FOR THIS PROJECT. SHOULD ANY IMPACTS TO WATERCOURSES BECOME NECESSARY, PROPER PERMITS MUST BE OBTAINED PRIOR TO CONSTRUCTION.

MS-15 STABILIZATION OF WATERCOURSE - THERE ARE NO WATERCOURSES LOCATED WITHIN THE PROJECT AREA.

MS-16 UNDERGROUND UTILITY LINE INSTALLATION - NO UNDERGROUND UTILITY LINES SHALL BE INSTALLED IN THIS PLAN.

MS-17 VEHICULAR SEDIMENT TRACKING - 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 ROADWAY. WHERE SEDIMENT IS TRANSPORTED INTO 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.

MS-18 REMOVAL OF TEMPORARY MEASURES - ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES SHALL BE REMOVED WITHIN 30 DAYS AFTER THE FINAL SITE STABILIZATION OR WHEN TEMPORARY MEASURES ARE NO LONGER NEEDED.

MS-19 STORMWATER MANAGEMENT - THE PROPOSED SITE IMPROVEMENTS ARE NOT EXPECTED TO INCREASE HYDROLOGIC CONDITIONS AT THE SITE OUTFALL. PLEASE, REFER TO H&H SUMMARY TABLE AND PERMANENT STORWMATER CONSIDERATIONS SECTION OF THE EROSION AND SEDIMENT CONTROL NARRATIVE FOR MORE DETAILED INFORMATION.

H Y D

R O

L O

G Y

M T C

F O

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E T T B

O R

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W S

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B A

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C O

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CHECKED BY:

DESIGNED BY:

DAP

DAP

DRAWN BY:

SMS

DATE:

8/8/12

DATE:

REVISIONS:

JOB#: 4475

SHEET: 5

SCALE:

AS SHOWN

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c o m \W

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\W M

B G c a d \4 s\

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P ic ke tt P o te n tia l B o rr o w P it S ite s\

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SEDIMENT TRAP SIZING CALCULATIONS

SEDIMENT

TRAP #

DRAINAGE AREA

(ACRES)

WET STORAGE

VOL REQUIRED

(CY)

DRY STORAGE

VOL REQUIRED

(CY)

TOTAL STORAGE

VOL REQUIRED

(CY)

WET

STORAGE

VOL.

PROVIDED

(CY)

DRY

STORAGE

VOL.

PROVIDED

(CY)

TOTAL

STORAGE

VOL.

PROVIDED

(CY)

DEPTH OF

DRY

STORAGE

'A'(FT)

TOP OF

BERM

ELEV.

(FT)

BOTTOM

OF BASIN

ELEV

(FT)

WET

POOL

ELEV

(FT)

DEPTH OF

WET

STORAGE

(FT)

SA AT

WET

STORAGE

(SF)

WEIR

LENGTH

(FT)

NOTES

1 0.60 40.2 40.2 80.4 41.0 54.0 95.0 3.00 339.00 332.00 336.00 4.00 1,874 3.6

G R

O U

P , I

N C

C e n te r S tr e e t

W ill ia m sb u rg

V ir g in ia

(7 -6

B o u ld e r

S p ri n g s D ri ve

S u ite

R ic h m o n d

V ir g in ia

(8 -3

R iv e rs id e P a rk w a y, S u ite

F re d e ri c ks b u rg

V ir g in ia

(5 -5

HYDROLOGIC SUMMARY

WATERSHED DATA

PRE-DEVELOPMENT

PROPOSED

PROPOSED

PRE-DEVELOPMENT

HYDROLOGIC SUMMARY

(IN/HR) (IN/HR)

INTENSITY INTENSITYTC (HR)C FACTORAREA (AC)

4.2 5.60.2030.231.47

3.25 4.350.3520.231.71

Q 10YRQ 2YR

1.711.28

2 YR 10 YR

NOTE:

1. THE PROPOSED RUNOFF CHARACTERISTICS ARE NOT EXPECTED TO INCREASE

FLOWS FROM THE SITE AREA.

2. THE C FACTOR WAS DERIVED USING TABLE 5-2 OF THE VIRGINIA EROSION AND

SEDIMENT CONTROL HANDBOOK. CONDITIONS USED FOR THIS PLAN WERE LAWNS -

HEAVY SOILS FLAT (0.15), PASTURE (0.20).

PRE-DEVELOPMENT

PROPOSED

5.1 6.70.1210.200.40

3.9 5.10.2480.200.40

DA-1

DA-2

1.891.42

Q 10YRQ 2YR

0.410.31

0.540.41

DA-1 DA-2

C FACTOR SUMMARY

TC SUMMARY TABLE