PRWI_242833_Carters_Pond_Drawings_FINAL_APPROVED_25_0903_(1).pdf

IMPROVE VISITOR ACCESS TO CARTERS POND

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21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

www.alphacorporation.com

IN PRINCE WILLIAM FOREST PARK

PRINCE WILLIAM FOREST PARK

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LOD LOD

CORPORATION

C1[NOTES_ LEGEND].DWGN:\JOBS\DULLES\572-100-C PRWI CAMP 5 AND CARTER POND ACCESS IMPROVEMENTS\5000 CIVIL\DWGS CARTER POND\IN PROGRESS\SHEETS NICK.NAVARRO

21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

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SECTION

SCALE:CG-001

A

CG-002

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BENCHMARK

N 6890217.39 E 11806961.89

ALPHA

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21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

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DEMOLITION KEY NOTES

REMOVE EX WOOD DECK, AND THE STRUCTURAL SUPPORT SYSTEM IN ITS ENTIRETY.

REMOVE EX GRAVEL WITHIN LOD AS REQUIRED TO CONSTRUCT NEW FLEXIBLE POROUS PAVEMENT TRAIL

NOTES

LEGEND

REMOVE EX GRAVEL AS REQUIRED TO CONSTRUCT NEW ASPHALT PARKING. SEE SHEET C3, SITE &

GRADING PLAN.

FULL DEPTH ASPHALT PAVEMENT REMOVAL

REMOVE EX TREE

STAGING AREA IN EXISTING PARKING LOT.

REMOVE EXISTING WOODEN BRIDGE. SEE "BRIDGE REMOVAL AND WETLANDS

NOTES" ON SHEET C4.

ALL EX TREES LOCATED INSIDE THE LOD AND EX TREES LOCATED ADJACENT THE OUTER PERIMETER OF THE LOD TO REMAIN AND BE PROTECTED UNLESS OTHERWISE INDICATED BY KEY NOTE 6 (TYPICAL).

1) SEE EROSION & SEDIMENT CONTROL PLANS FOR TREE

PROTECTION DETAILS AND TREE PROTECTION ALONG THE

LIMITS OF DISTURBANCE (LOD)

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TYP

ALPHA

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C3 [SITE&GRAD]_NEW.DWGN:\JOBS\DULLES\572-100-C PRWI CAMP 5 AND CARTER POND ACCESS IMPROVEMENTS\5000 CIVIL\DWGS CARTER POND\IN PROGRESS\SHEETS NICK.NAVARRO

21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

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LEGEND

KEY NOTES

6' WIDE TRAIL CONSTRUCTED OF FLEXIBLE POROUS PAVING WITH CURB. SEE DETAIL 1/SHEET C14.

SEGMENTAL RETAINING WALL. SEE STRUCTURAL SHEETS S6 & S9.

SQUARE STEEL DOUBLE SWING BARRIER GATE. SEE DETAIL 1 & 2/SHEET C15.

FULL DEPTH ASPHALT PAVEMENT REPLACEMENT. PAVEMENT SHALL MATCH EXISTING SECTION.

SEE DETAIL 6 / SHEET C14 FOR PAVEMENT TIE-IN TO EXISTING.

PROVIDE ASPHALT PAVEMENT AT NEW PARKING. SEE DETAIL 3/SHEET C14.

BEGIN 6' WIDE TRAIL CONSTRUCTED OF FLEXIBLE POROUS PAVEMENT WITH CURB. SEE DETAIL 1/SHEET C14.

BOARDWALK - SEE SHEETS STRUCTURAL SHEETS S2 & S4.

20'X10' OBSERVATION DECK. SEE STRUCTURAL SHEETS FOR DETAIL.

ACCESSIBLE PARKING. SEE DETAIL 4/SHEET C14

SPLIT RAIL FENCE. SEE DETAIL 5/SHEET C14.

NOTES

1) SEE EROSION & SEDIMENT CONTROL PLANS FOR TREE

PROTECTION DETAILS AND TREE PROTECTION ALONG THE

LIMITS OF DISTURBANCE (LOD)

ALL EX TREES LOCATED INSIDE THE LOD TO REMAIN AND BE PROTECTED UNLESS OTHERWISE INDICATED BY

KEY NOTE 6 ON SHEET C2 (TYPICAL).

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21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

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KEY NOTES

ABAAS COMPLIANT FLEXIBLE POROUS PAVING TRAIL. STA. 10+00 TO STA. 17+54

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MAIN PATH

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ALPHA

CORPORATION

C3 [SITE&GRAD]_NEW.DWGN:\JOBS\DULLES\572-100-C PRWI CAMP 5 AND CARTER POND ACCESS IMPROVEMENTS\5000 CIVIL\DWGS CARTER POND\IN PROGRESS\SHEETS NICK.NAVARRO

21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

www.alphacorporation.com

H:V:

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EROSION & SEDIMENT CONTROL LEGEND

SFSILT FENCE

TITLEVESCH NO. KEY SYMBOL

3.05

PERMANENT

SEEDING3.32

TREE PROTECTION3.38

SF

PS

TP

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CONCRETE WASHOUT

STRUCTURE

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21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

www.alphacorporation.com

LEGEND

BRIDGE REMOVAL AND WETLANDS NOTES

1) NO HEAVY EQUIPMENT IS AUTHORIZED WITHIN STATE AND FEDERAL JURISDICTIONAL WETLANDS AND STREAM CHANNEL UNLESS ACCOMPANIED BY WRITTEN AUTHORIZATION.

2) AFTER REMOVAL OF EXISTING BRIDGE AND CONSTRUCTION OF THE PROPOSED BRIDGE, SEED THE AREA WITH SEED MIX FOR WETLAND AREAS AND COVER CROP. SEE DETAIL D

"TEMPORARY AND PERMANENT SEEDING FOR WETLAND AREAS" ON SHEET C6.

SEE "BRIDGE REMOVAL

AND WETLANDS NOTES"

CWS

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21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

www.alphacorporation.com

GENERAL EROSION CONTROL NOTES:

1. THE CONTRACTOR SHALL BE RESPONSIBLE FOR SATISFYING ANY AND ALL EROSION

CONTROL (EC) AND STORMWATER MANAGEMENT (SWM) REQUIREMENTS FOR ANY

LAND DISTURBING ACTIVITIES, INCLUDING BUT NOT LIMITED TO, ON-SITE OR OFFSITE

BORROW, ON-SITE OR OFFSITE STOCKPILING OR DISPOSAL OF WASTE MATERIALS.

BEFORE UNDERTAKING ANY LAND DISTURBING ACTIVITY FOR WHICH THE PLANS DO

NOT SPECIFICALLY ADDRESS EROSION CONTROL AND STORMWATER MANAGEMENT,

THE CONTRACTOR SHALL CONTACT THE REGIONAL OFFICE OF THE DIVISION OF SOIL

AND WATER CONSERVATION TO DETERMINE WHAT EC AND SWM MEASURES ARE

NECESSARY. THE CONTRACTOR SHALL COMPLETELY SATISFY ALL REQUIREMENTS OF

THE CONTRACTING OFFICER INCLUDING PROVIDING A DESIGNATED, CERTIFIED,

"RESPONSIBLE LAND DISTURBER" AS DEFINED IN 9VAC25-850-10 BEFORE

CONTINUING WITH THE CONCERNED ACTIVITY.

2. DEVICES SHOWN ON SHEET C4 ARE TO BE CONSIDERED MINIMUM EROSION AND

SEDIMENT CONTROLS. ADDITIONAL CONTROLS MAY BE NECESSARY DUE TO

CONTRACTOR PHASING OR OTHER UNANTICIPATED CONDITIONS. IT IS THE

CONTRACTOR'S RESPONSIBILITY TO PROVIDE ADDITIONAL DEVICES TO THOSE

SHOWN IN ORDER TO CONTROL EROSION AND SEDIMENTATION. THIS IS INCLUDING,

BUT NOT LIMITED TO, THE REVISION, RELOCATION OR ADDITIONS OF SILT FENCE,

INLET PROTECTION, AND TEMPORARY SEEDING.

3. EROSION AND SEDIMENT CONTROL MEASURES SHALL BE INSTALLED AND

MAINTAINED ACCORDING TO THE STANDARDS AND SPECIFICATIONS OF THE LATEST

EDITION OF THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK.

4. THE CONTRACTOR IS TO PROVIDE ADEQUATE MEANS OF ALLAYING DUST AS

NECESSARY BY APPLYING EITHER MOISTURE, CALCIUM CHLORIDE OR BOTH

MATERIALS ALONG THOSE SECTIONS OF THE PROJECT ADJACENT TO PUBLIC ACCESS.

5. APPLY PERMANENT VEGETATION (SEEDING) WITH SOIL PREPARATION.

AMENDMENTS AND SEED MIXTURE SHALL BE APPROPRIATE TO THE TIME OF YEAR.

SEE SEEDING MIX ON SHEET C6 FOR FURTHER DETAIL.

6. NO UNPROTECTED, DISTURBED AREA SHALL DRAIN TO ROADWAY PAVEMENTS SUCH

THAT THE SUBBASE, BASE OR WEARING SURFACE ARE CONTAMINATED BY SILT

TRAPPED AT LOW POINTS OR INLETS.

7. WATER SOURCE FOR TEMPORARY CONSTRUCTION ENTRANCES TO BE PROVIDED BY

EITHER A WATER TANK TRUCK OR AN EXISTING FIRE HYDRANT.

8. THE GRADING/EXCAVATION CONTRACTOR FOR THE SUBJECT SITE IS REQUIRED TO

NOTIFY, IN WRITING, THE ASSIGNED SITE INSPECTOR REGARDING ANY EXCESS

MATERIAL PROPOSED TO BE HAULED OFFSITE PRIOR TO HAULING. THE NOTIFICATION

MUST INDICATE THE QUANTITY OF MATERIAL TO BE MOVED OFFSITE,

IDENTIFICATION OF THE RECEIVING SITE WHERE THE EXCESS WILL BE TAKEN, AND

ALL INFORMATION NECESSARY TO SHOW THAT SUCH RECEIVING SITE HAS BEEN

PROPERLY PERMITTED AND HAS E&S CONTROLS INSTALLED.

ADDITIONAL EROSION CONTROL NOTES:

ES-1: UNLESS OTHERWISE INDICATED, ALL VEGETATIVE AND STRUCTURAL EROSION AND

SEDIMENT CONTROL PRACTICES WILL BE CONSTRUCTED AND MAINTAINED ACCORDING

TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE VIRGINIA EROSION AND

SEDIMENT CONTROL HANDBOOK, LATEST EDITION AND THE VIRGINIA EROSION AND

SEDIMENT CONTROL REGULATIONS.

ES-2: THE ADMINISTRATOR MUST BE NOTIFIED ONE WEEK PRIOR TO THE

PRE-CONSTRUCTION CONFERENCE, TWO WEEKS PRIOR TO THE COMMENCEMENT OF

LAND DISTURBING ACTIVITY, AND ONE WEEK PRIOR TO THE FINAL INSPECTION. THE

NAME OF THE RESPONSIBLE LAND DISTURBER MUST BE PROVIDED TO THE

ADMINISTRATOR TWO WEEKS PRIOR TO ACTUAL ENGAGEMENT IN THE

LAND-DISTURBING ACTIVITY SHOWN ON THE APPROVED PLAN. IF THE NAME IS NOT

PROVIDED PRIOR TO ENGAGING IN THE LAND-DISTURBING ACTIVITY, THE PLAN'S

APPROVAL WILL BE REVOKED.

ES-3: ALL EROSION AND SEDIMENT CONTROL MEASURES TO BE PLACED PRIOR TO OR AS

THE FIRST STEP IN CLEARING.

ES-4: A COPY OF THE APPROVED E&SC PLAN SHALL BE MAINTAINED ON THE SITE AT ALL

TIMES.

ES-5: PRIOR TO COMMENCING LAND DISTURBING ACTIVITIES IN AREAS OTHER THAN

INDICATED ON THESE PLANS (INCLUDING BUT NOT LIMITED TO, OFF-SITE BORROW OR

WASTE AREAS) THE CONTRACTOR SHALL SUBMIT A SUPPLEMENTARY E&SC PLAN TO THE

ADMINISTRATOR FOR REVIEW AND APPROVAL.

ES-6: THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY ADDITIONAL

EROSION CONTROL MEASURES NECESSARY TO PREVENT EROSION AND SEDIMENTATION

AS DETERMINED BY THE INSPECTOR.

ES-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, AFTER WHICH UPON

APPROVAL BY THE INSPECTOR, THE CONTROLS SHALL BE REMOVED. TRAPPED

SEDIMENT AND DISTURBED SOIL AREAS RESULTING FROM THE REMOVAL OF

TEMPORARY MEASURES SHALL BE PERMANENTLY STABILIZED TO PREVENT FURTHER

EROSION AND SEDIMENTATION.

ES-8: DURING DEWATERING OPERATIONS, WATER SHALL BE PUMPED INTO AN

APPROVED FILTERING DEVICE.

ES-9: THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES AT LEAST

ONCE EVERY FOUR (4) BUSINESS DAYS OR AT LEAST ONCE EVERY (5) BUSINESS DAYS

AND NO LATER THAN 48 HOURS FOLLOWING A MEASURABLE STORM EVENT. ANY

NECESSARY REPAIRS OR CLEANUP TO MAINTAIN THE EFFECTIVENESS OF THE EROSION

CONTROL DEVICES SHALL BE MADE IMMEDIATELY.

ES-10: THE CONTRACTOR IS RESPONSIBLE FOR THE DAILY REMOVAL OF SEDIMENT THAT

HAS BEEN TRANSPORTED ONTO A PAVED OR PUBLIC ROAD SURFACE.

ES-11: SEEDING OPERATIONS SHALL BE INITIATED WITHIN 7 DAYS AFTER REACHING

FINAL GRADE OR UPON SUSPENSION OF GRADING OPERATIONS FOR ANTICIPATED

DURATION OF GRATER THAN 14 DAYS UPON COMPLETION OF GRADING OPERATIONS

FOR A SPECIFIC AREA.

ES-12: THE CONTRACTOR SHALL BE RESPONSIBLE FOR PREVENTING SURFACE AND AIR

MOVEMENT OF DUST FROM EXPOSED SOILS WHICH MAY PRESENT HEALTH HAZARDS,

TRAFFIC SAFETY PROBLEMS OR HARM ANIMAL OR PLANT LIFE.

ES-13: A VIRGINIA STORMWATER MANAGEMENT PROGRAM (VSMP) PERMIT FOR THE

DISCHARGE OF STORMWATER FROM CONSTRUCTION ACTIVITIES IS REQUIRED FOR

PROJECTS DISTURBING 1 ACRE OR GREATER.

PERMANENT VEGETATIVE COVER NOTE:

ALL AREAS DISTURBED BY CONSTRUCTION SHALL BE STABILIZED WITH PERMANENT

SEEDING IMMEDIATELY FOLLOWING FINISH GRADING. SEEDING SHALL BE SELECTED

ACCORDING TO THE DETAIL ON SHEET C6. THE PLANTING SOIL MUST HAVE ENOUGH

FINE GRADED SOIL, FAVORABLE pH, SUFFICIENT PORE SPACE, SUFFICIENT DEPTH AND

FREE FROM TOXIC AMOUNTS OF HARMFUL MATERIALS OR EXCESSIVE QUANTITIES OF

ROOTS/STONES AND SHALL BE APPLIED WITH STD & SPEC 3.30. AFTER SEED IS IN PLACE,

IT MUST BE PROTECTED WITH A MULCH TO HOLD MOISTURE AND MODIFY

TEMPERATURE EXTREMES, AND TO PREVENT EROSION WHILE SEEDLINGS ARE

GROWING.

GENERAL LAND CONSERVATION NOTES

1. NO DISTURBED AREA WHICH IS NOT ACTIVELY BEING WORKED SHALL REMAIN

DENUDED FOR MORE THAN 7 CALENDAR DAYS.

2. ALL E&S CONTROL MEASURES APPROVED WITH THE E&S PLAN SHALL BE PLACED AS

THE FIRST STEP IN GRADING.

3. ALL STORM AND SANITARY SEWER LINES NOT IN STREETS SHALL BE SEEDED AND

MULCHED WITHIN 5 DAYS AFTER BACKFILL.

4. ELECTRIC POWER, TELEPHONE AND GAS SUPPLY TRENCHES SHALL BE COMPACTED,

SEEDED AND MULCHED WITHIN 7 DAYS AFTER BACKFILL.

6. DURING CONSTRUCTION ALL STORM SEWER INLETS SHALL BE PROTECTED BY INLET

PROTECTION, MAINTAINED AND MODIFIED DURING CONSTRUCTION PROGRESS AS

REQUIRED.

8. AT THE COMPLETION OF ANY PROJECT CONSTRUCTION AND PRIOR TO BOND

RELEASE, ALL TEMPORARY SEDIMENT CONTROLS SHALL BE REMOVED AND ALL

DENUDED AREAS SHALL BE STABILIZED.

9. DURING CONSTRUCTION OF THE PROJECT, SOIL STOCKPILES AND BORROW AREAS

SHALL BE STABILIZED OR PROTECTED WITH SEDIMENT TRAPPING MEASURES.

10.ALL SOIL THAT IS BROUGHT TO THE SITE SHALL BE FROM AN APPROVED (i.e.

PERMITTED) LOCATION. ALL SOIL REMOVED FROM THE SITE WILL BE TAKEN TO AN

APPROVED (i.e. PERMITTED) LOCATION.

SOILS

THE SITE CONSISTS OF BUCKHALL LOAM(10C), MEADOWVILLE LOAM(38B), OCCOQUAN

SANDY LOAM(44D), AND OCCOQUAN SANDY LOAM(44E). FOR MORE SOILS

INFORMATION SEE SOIL MAP ON SHEET C6.

ANTICIPATED PHASING OF CONSTRUCTION

1. INSTALL SAFETY AND PROTECTION MEASURES PRIOR TO LAND DISTURBING

ACTIVITIES, INCLUDING TREE PROTECTION. INSTALL EROSION & SEDIMENT

CONTROLS & ENSURE THEY ARE PROPERLY FUNCTIONING PRIOR TO BEGINNING THE

WORK AND DISTURBANCE

2. NOTIFY THE PLAN APPROVING AUTHORITY ONE WEEK PRIOR TO THE

PRE-CONSTRUCTION CONFERENCE AND ONE WEEK PRIOR TO THE COMMENCEMENT

OF LAND-DISTURBING ACTIVITY AS REQUIRED BY GENERAL EROSION & SEDIMENT

CONTROL NOTES SHOWN THIS SHEET

3. CONTRACTOR TO COMMENCE DEMOLITION OF GRAVEL TRAIL, WOOD DECK,

ASPHALT PAVEMENT, TREES, AND WOOD BRIDGE.

4. INSTALL PROPOSED WALK AND OTHER APPURTENANCES AS PER THE PLAN.

5. TEMPORARILY STABILIZE THE SITE DAILY AS WORK PROGRESSES

6. PERMANENTLY SEED ALL DENUDED AREAS IMMEDIATELY FOLLOWING FINISHED

GRADING.

7. NOTIFY THE PLAN APPROVING AUTHORITY ONE WEEK PRIOR TO THE FINAL

INSPECTION. UPON COMPLETION OF CONSTRUCTION, ADEQUATE STABILIZATION,

AND AUTHORITY APPROVAL, REMOVE ALL EROSION AND SEDIMENT CONTROL

MEASURES.

SEDIMENT AND EROSION CONTROL NARRATIVE

PROJECT DESCRIPTION

THE PROPOSED PROJECT IS LOCATED AT CARTER'S POND IN PRINCE WILLIAM FOREST

PARK IN TRIANGLE, VIRGINIA. THE PROJECT PURPOSES TO RECONSTRUCT EXISTING

GRAVEL & DIRT TRAIL WITH NEW ACCESSIBLE PATHWAYS. THE PROJECT ALSO PROPOSES

NEW PEDESTRIAN RAISED BOARDWALK ACROSS CARTER'S POND AND OBSERVATION

DECK.

EXISTING SITE CONDITIONS

THE SITE IS LOCATED AT THE PRINCE WILLIAM FOREST CARTER'S POND TRAIL AND

PICNIC GROUNDS IN TRIANGLE, VIRGINIA. THE CAMPGROUND IS MAINLY WOODED. IT

CONTAINS SOME ROADWAYS, WALKWAYS, PICNIC AREAS, TRAILS AND COMPACTED

TURF WITH VEGETATION.

ADJACENT PROPERTY

THE PROJECT SITE IS A PART OF THE OVERALL PRINCE WILLIAM FOREST PARK AND IS

BORDERED BY WOODS ON ALL SIDES.

OFFSITE AREAS

AS APPROVED BY THE CO.

CRITICAL EROSION AREAS

THE PROJECT SITE CONSISTS OF MODERATE SLOPES AND IS NEAR AREAS OF

STORMWATER RUNOFF CULMINATION.

SEDIMENT CONTROL PROGRAM

THE EROSION AND SEDIMENT CONTROL PROGRAM HAS BEEN PROPOSED TO BE

INSTALLED BEFORE OTHER CLEARING, GRADING AND CONSTRUCTION STARTS.

CONTROLS INSTALLED ARE INTENDED TO REMAIN FOR THE DURATION OF THE PROJECT.

DUST CONTROL NARRATIVE

THE CONTRACTOR SHALL UTILIZE DUST CONTROL MEASURES AS DEFINED IN THE

VIRGINIA STATE EROSION AND SEDIMENT CONTROL HANDBOOK TO PREVENT SURFACE

AND AIR MOVEMENT OF DUST FROM EXPOSED SOIL SURFACES AND REDUCE THE

PRESENCE OF AIRBORNE SUBSTANCES WHICH MAY PRESENT HEALTH HAZARDS,

TRAFFIC SAFETY PROBLEMS, OR HARM ANIMAL OR PLANT LIFE.

EROSION AND SEDIMENT CONTROL MEASURES

1. SILT FENCE - 3.05 A TEMPORARY SEDIMENT BARRIER CONSTRUCTED OF POSTS AND

FILTER FABRIC AND PLACED AT THE TOE OF A SLOPE TO INTERCEPT AND DETAIN

SEDIMENT AND DECREASE FLOW VELOCITIES FROM DRAINAGE AREAS OF LIMITED

SIZE.

PERMANENT STABILIZATION/VEGETATIVE MEASURES WILL INCLUDE:

1. TEMPORARY SEEDING (3.31) - TEMPORARY SOIL STABILIZATION SHALL BE APPLIED

WITHIN 7 DAYS TO DENUDED AREAS NOT AT FINAL GRADE BUT WILL REMAIN

DORMANT FOR LONGER THAN 14 DAYS. TEMPORARY SEEDING MAY BE USED

DURING SEASONS WHEN PERMANENT SEEDING IS PROHIBITED. SEEDING SHALL BE

PER TABLE 3.31.B.

2. PERMANENT SEEDING (3.32) - ALL AREAS DENUDED BY THIS CONSTRUCTION

SHALL BE STABILIZED SEEDING. PERMANENT SEEDING SHALL BE PER TABLE ON C6.

MAINTENANCE

1. ALL MEASURES ARE TO BE INSPECTED DAILY BY THE SITE SUPERINTENDENT OR

THEIR REPRESENTATIVE. ANY DAMAGED STRUCTURAL MEASURES ARE TO BE

REPAIRED BY THE END OF THE DAY.

2. TRAPPED SEDIMENT IS TO BE REMOVED AS REQUIRED TO MAINTAIN EFFICIENCY

AND TO BE DISPOSED OF BY SPREADING ON-SITE.

3. CONTROLS MAY BE REMOVED AFTER AREAS ABOVE THEM HAVE BEEN

STABILIZED AND WITH APPROVAL OF THE SITE INSPECTOR.

MINIMUM STANDARDS (9VAC25-840-40):

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 STOCK PILES 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, 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 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 MAN-MADE CHANNELS AND SHALL BE

EXEMPT FROM ANY FLOW RATE CAPACITY AND VELOCITY REQUIREMENTS FOR

NATURAL OR MAN-MADE CHANNELS:

A. CONCENTRATED STORMWATER RUNOFF LEAVING A DEVELOPMENT SITE SHALL

BE DISCHARGED DIRECTLY INTO AN ADEQUATE NATURAL OR MAN-MADE

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 MAN-MADE CHANNELS SHALL BE ANALYZED

BY THE USE OF A 10-YEAR STORM TO VERIFY THAT STORMWATER WILL NOT

OVERTOP ITS 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

MAN-MADE 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 PRE-DEVELOPMENT PEAK

RUNOFF RATE FROM A TWO-YEAR STORM TO INCREASE WHEN RUNOFF OUTFALLS

INTO A NATURAL CHANNEL OR WILL NOT CAUSE THE PRE-DEVELOPMENT PEAK

RUNOFF RATE FROM A 10-YEAR STORM TO INCREASE WHEN RUNOFF OUTFALLS

INTO A MAN-MADE CHANNEL; OR

(4) PROVIDE A COMBINATION OF CHANNEL IMPROVEMENT, STORMWATER

DETENTION OR OTHER MEASURES WHICH IS SATISFACTORY TO THE VESCP

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, HE SHALL OBTAIN APPROVAL FROM THE VESCP OF 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 ON-SITE 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 WHICH 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 MAN-MADE CHANNELS SHALL

SATISFY THE FLOW RATE CAPACITY AND VELOCITY REQUIREMENTS FOR NATURAL

OR MAN-MADE 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, 2, AND 10-YEAR, 24-HOUR STORMS TO A LEVEL THAT IS

LESS THAN OR EQUAL TO THE PEAK FLOW RATE FROM THE SITE ASSUMING IT 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 IT WAS IN A GOOD FORESTED

CONDITION DIVIDED BY THE RUNOFF VOLUME FROM THE SITE IN ITS PROPOSED

CONDITION, AND SHALL BE EXEMPT FROM ANY FLOW RATE CAPACITY AND

VELOCITY REQUIREMENTS FOR NATURAL OR MAN-MADE CHANNELS AS DEFINED

IN ANY REGULATIONS PROMULGATED PURSUANT TO § 62.1-44.15:54 OR

62.1-44.15:65 OF THE ACT.

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 ACT AND THIS

SUBSECTION SHALL BE SATISFIED BY COMPLIANCE WITH WATER QUANTITY

REQUIREMENTS IN THE STORMWATER MANAGEMENT ACT (§ 62.1-44.15:24 ET

SEQ. OF THE CODE OF VIRGINIA) AND ATTENDANT REGULATIONS, UNLESS SUCH

LAND-DISTURBING ACTIVITIES (I) ARE IN ACCORDANCE WITH PROVISIONS FOR

TIME LIMITS ON APPLICABILITY OF APPROVED DESIGN CRITERIA IN 9VAC25-870-47

OR GRANDFATHERING IN 9VAC25-870-48 OF THE VIRGINIA STORMWATER

MANAGEMENT PROGRAM (VSMP) REGULATION, IN WHICH CASE THE FLOW RATE

CAPACITY AND VELOCITY REQUIREMENTS OF § 62.1-44.15:52 A OF THE ACT SHALL

APPLY, OR (II) ARE EXEMPT PURSUANT TO § 62.1-44.15:34 C 7 OF THE ACT.

N. COMPLIANCE WITH THE WATER QUANTITY MINIMUM STANDARDS SET OUT IN

9VAC25-870-66 OF THE VIRGINIA STORMWATER MANAGEMENT PROGRAM

(VSMP) REGULATION SHALL BE DEEMED TO SATISFY THE REQUIREMENTS OF THIS

SUBDIVISION 19.

SCALE:

SILT FENCE

NTSA SCALE:

TEMPORARY & PERMANENT SEEDING

NTSB SCALE:

TREE PROTECTION

NTSC

ALPHA

CORPORATION

C4_C5-C6 [E&S].DWGN:\JOBS\DULLES\572-100-C PRWI CAMP 5 AND CARTER POND ACCESS IMPROVEMENTS\5000 CIVIL\DWGS CARTER POND\IN PROGRESS\SHEETS NICK.NAVARRO

21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

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PERMANENT SEEDING

TEMPORARY SEEDING

WETLAND SEEDING SPECIFICATIONS

1) CONTRACTOR SHALL SUBMIT SEED TAGS TO THE CO AND COR AND OBTAIN WRITTEN APPROVAL PRIOR TO

THE COMMENCEMENT OF ANY WORK.

2) SEED SHALL HAVE BEEN COLLECTED THE SAME YEAR OF SEEDING. A SEED GERMINATION AND PURITY

RATE OF AT LEAST 75% IS REQUIRED. EVIDENCE OF SUCH SHALL BE SUBMITTED TO THE CO AND COR

PRIOR TO PLANTING.

3) AFTER REMOVAL OF THE EXISTING BRIDGE AND CONSTRUCTION OF THE NEW BRIDGE, THE SPECIFIED SEED SHALL BE BROADCAST IN THE VICINITY OF BRIDGE REMOVAL AND CONSTRUCTION, AT THE RATES SPECIFIED IN THE WETLANDS SEEDING SCHEDULE. FOLLOWING SEEDING SOW SEED TO A DEPTH OF 1/8TH

OF AN INCH BY THE USE OF A HAND RAKE.

4) THE LANDSCAPE CONTRACTOR SHALL INSPECT THE AREAS AND CONDITIONS UNDER WHICH THE SEEDING WORK IS TO BE PERFORMED PRIOR TO COMMENCING WORK. IF CONDITIONS ARE DETRIMENTAL TO THE PROPER AND TIMELY COMPLETION OF THE WORK, HE/SHE SHALL NOTIFY THE CO VERBALLY AND IN WRITING AND POSTPONE COMMENCING WORK UNTIL THE UNSATISFACTORY CONDITIONS HAVE BEEN

CORRECTED.

5) PRIOR TO SEEDING, THE TOPSOIL SHALL BE RAKED SMOOTH AND CLEARED OF ALL TRASH, DEBRIS, BRANCHES AND OTHER MATTER DETRIMENTAL TO THE SUCCESS OF SEEDING.

6) MULCH SHALL BE STRAW AND CAN BE SUBSTITUTED IF APPLIED AT A RATE SPECIFIED BY THE VIRGINIA

EROSION AND SEDIMENT CONTROL HANDBOOK, 3RD EDITION, 1992.

7) CARE SHOULD BE EXERCISED TO ENSURE UNIFORM SEED COVERAGE IS OBTAINED. SEED SHALL BE

APPLIED AT THE RATE SPECIFIED ON THE WETLANDS SEEDING SCHEDULE.

8) FOLLOWING THE APPLICATION OF THE WETLAND SEED MIX AND COVER CROP , THE SEEDED AREA SHALL BE COVERED WITH CLEAN WHEAT STRAW TO A DEPTH OF APPROXIMATELY 1 INCH. IF THE SEED IS HYDROSEEDED, OR COVERED WITH COIR MATTING, THEN NO STRAW NEEDS TO BE APPLIED Ù.N.O .

MATTING CONTAINING PLASTIC MESH SHALL BE USED.

9) PROVIDE WETLAND SEED MIX AND COVER CROP IN COMPLIANCE WITH THE CRITERIA BELOW.

SCALE:

TEMPORARY & PERMANENT SEEDING FOR WETLAND AREAS

NTSD

NOTE: FOR TEMPORARY & PERMANENT SEEDING WITHIN

WETLAND AREAS. SEE DETAIL D.

SEED SPECIES:

· QUALITY: SEED COLLECTION DATE, GERMINATION AND PURITY RATES AS SPECIFIED IN ITEM 2 ABOVE.

· SEED WETLAND AREAS WITH ERNST CONSERVATION SEEDS, VA NORTHERN PIEDMONT FACW MIX -

ITEM #ERNMX-855, OR APPROVED EQUAL AND COVER CROP. ALTERNATE SEED MIXES WILL BE

CONSIDERED BUT MUST MEET THE QUALITY REQUIREMENTS LISTED ABOVE AND THE PERFORMANCE

REQUIREMENTS OF THE BASIS OF DESIGN SEED MIX AS FOLLOWS:

a. PERFORMANCE REQUIREMENTS: A NATIVE WET MEADOW MITIGATION AND RESTORATION MIX WITH

SPECIES NATIVE TO VIRGINIA'S NORTHERN PIEDMONT REGION.

A

B

D

A

A

C

D

A

IMPERVIOUS COVER

BARREN SOIL LAND COVER

(OPEN SPACE POOR CONDITION)

LEGEND

LIMITS OF DISTURBANCE

(FOR STORMWATER

COMPUTATION PURPOSES ONLY)

MANAGED TURF

(NONE SHOWN)

DRAINAGE AREA

SYMBOL DESCRIPTION

DRAINAGE DIVIDE

D

A

B

HYDROLOGIC SOIL GROUP

(PER PRINCE WILLIAM

COUNTY GIS)

FOREST/OPEN SPACE

ALPHA

CORPORATION

C7.DWGN:\JOBS\DULLES\572-100-C PRWI CAMP 5 AND CARTER POND ACCESS IMPROVEMENTS\5000 CIVIL\DWGS CARTER POND\IN PROGRESS\SHEETS NICK.NAVARRO

21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

www.alphacorporation.com

8/27/249/16/24 jbello Polygon jbello

A

B

D

A

A

C

D

A

FLOWPATH

ANALYSIS

SECTION 4

SECTION

4.1

FLOWPATH

ANALYSIS

SECTION

9.1

SECTION

9 FLOWPATH

ANALYSIS

SECTION 8.1

SECTION 8

FLOWPATH

ANALYSIS

SECTION 7.1

SECTION 7

SECTION 5

FLOWPATH

ANALYSIS

SECTION 6.1

SECTION 6

IMPERVIOUS COVER

LEGEND

LIMITS OF DISTURBANCE

(FOR STORMWATER

COMPUTATION PURPOSES ONLY)

MANAGED TURF

(NONE SHOWN)

DRAINAGE AREA

SYMBOL DESCRIPTION

DRAINAGE DIVIDE

D

A

B

HYDROLOGIC SOIL GROUP

(PER PRINCE WILLIAM

COUNTY GIS)

REPRESENTATIVE FLOW PATH

ALPHA

CORPORATION

C8.DWGN:\JOBS\DULLES\572-100-C PRWI CAMP 5 AND CARTER POND ACCESS IMPROVEMENTS\5000 CIVIL\DWGS CARTER POND\IN PROGRESS\SHEETS NICK.NAVARRO

21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

www.alphacorporation.com

8/27/249/16/24 jbello Polygon jbello

C9.DWGN:\JOBS\DULLES\572-100-C PRWI CAMP 5 AND CARTER POND ACCESS IMPROVEMENTS\5000 CIVIL\DWGS CARTER POND\IN PROGRESS\SHEETS NICK.NAVARRO

21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

www.alphacorporation.com

WATER QUALITY COMPUTATIONS

WATER QUALITY NARRATIVE

THE SITE IS DEFINED BY THE PROPOSED LIMITS OF DISTURBANCE (LOD) OF APPROXIMATELY 0.25 ACRES. SEE BELOW DESCRIPTION FOR EXEMPT UTILITY AREAS.

WATER QUALITY REQUIREMENTS

THE SITE IS SUBJECT TO THE REQUIREMENTS OF SECTION 9VAC25-870-63.A.2 OF THE VSMP REGULATION FOR THE DEVELOPMENT ON PRIOR DEVELOPED LANDS.

WATER QUALITY COMPLIANCE

THE SITE IN ITS PRE-DEVELOPMENT CONDITIONS CONTAINS AREAS OF COMPACTED DIRT COVER (DIRT TRAIL AROUND THE POND) WHERE THE AREAS HAVE BEEN SUBJECT TO PROLONGED FOOT TRAFFIC BY SITE USERS. GROUND IS COMPACTED IN THESE AREAS AND IT IS CONSIDERED IMPERVIOUS COVER PER 9VAC25-870-10, DEFINITION OF IMPERVIOUS COVER. IN POST-DEVELOPMENT CONDITION, THE WORK PROPOSES TO ESTABLISH GOOD CONDITION MANAGED TURF LAND COVER WITHIN THE LOD IN THESE AREAS VIA TILLING AND AERATION OF THE FIRST 6 TO 10 INCHES OF THE

TOPSOIL AND PERMANENT SEEDING.

THE OWNER SHALL BE RESPONSIBLE FOR MAINTENANCE OF THE MANAGED TURF COVER IN GOOD CONDITION ALONG PAVED TRAIL PER SECTION 9VAC25_870-112.A. A MAINTENANCE AGREEMENT IS

NOT REQUIRED TO BE SUBMITTED TO DEQ.

THE SITE ALSO PLANS ON UTILIZING THE REMAINDER OF AVAILABLE CREDIT OBTAINED BY DEDICATING LAND COVER CONSERVATION AREA, UNDER APPROVED PLANS FOR REHABILITATE INFRASTRUCTURE AT PARK CAMPGROUNDS PROJECT. THESE PROJECTS ARE A SERIES OF PHASED DEVELOPMENT OF MULTIPLE CAMPGROUNDS AND FACILITIES WITHIN THE GROUNDS OF PRINCE WILLIAM FOREST PARK PROPERTY. THE TOTAL PROVIDED WATER QUALITY FROM RV CAMPGROUND PROJECTED EXCEED THE REQUIRED TOTAL PHOSPHOROUS LOAD REDUCTION AND REMAINDER WAS CREDITED TO OFFSET THE REQUIREMENTS FOR TURKEY RUN RIDGE CAMPGROUND. THE REMAINDER OF LOAD REDUCTION CREDIT IS PROPOSED TO BE USED WITH THIS APPLICATION.

SEE WATER QUALITY REQUIREMENT COMPUTATIONS ON THIS SHEET.

SEE RECORD DRAWINGS ON SHEETS C10 THROUGH C12 FROM PREVIOUSLY APPROVED PLANS.

WATER QUALITY COMPLIANCE TRACKING

EXISTING LAND COVER NARRATIVE

PER SECTION 9VAC25-870-66.E AND F, THE APPLICANT REQUESTED TO CHARACTERIZE THE

COMMON GROUND'S LAND COVER AS IMPERVIOUS FOR THE PURPOSE OF WATER QUALITY

COMPUTATIONS. FOR WATER QUANTITY COMPUTATIONS, THE APPLICANT REQUESTS WITH THIS

APPLICATION TO ADJUST THE RUNOFF CURVE NUMBER TO THAT OF "OPEN SPACE IN POOR

CONDITION". IT IS ALPHA'S PROFESSIONAL OPINION THAT THESE AREAS (APPROXIMATELY 0.50

ACRES) DO NOT WARRANT THE USE OF VALUES REPRESENTING GOOD HYDROLOGIC

CONDITIONS.

THESE AREAS AREA LOCATED IN HYDROLOGIC SOIL GROUP (HSG) A; HOWEVER, THE AREAS

HAVE BEEN SUBJECTED TO PROLONGED PERIODS OF HEAVY FOOT TRAFFIC AND THE TOP

STRATA HAS BEEN COMPACTED TO AN EXTENT WHERE THE GROUND BEHAVES SIMILAR TO AN

IMPERVIOUS SURFACE.

SEE SHEETS C7 FOR EXTENTS OF THESE AREAS.

SEE IMAGES ABOVE FROM OUR SITE VISIT.

C9.DWGN:\JOBS\DULLES\572-100-C PRWI CAMP 5 AND CARTER POND ACCESS IMPROVEMENTS\5000 CIVIL\DWGS CARTER POND\IN PROGRESS\SHEETS NICK.NAVARRO

21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

www.alphacorporation.com

RECORD DRAWING FOR

INFORMATION ONLY !!!

C9.DWGN:\JOBS\DULLES\572-100-C PRWI CAMP 5 AND CARTER POND ACCESS IMPROVEMENTS\5000 CIVIL\DWGS CARTER POND\IN PROGRESS\SHEETS NICK.NAVARRO

21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

www.alphacorporation.com

RECORD DRAWING FOR

C9.DWGN:\JOBS\DULLES\572-100-C PRWI CAMP 5 AND CARTER POND ACCESS IMPROVEMENTS\5000 CIVIL\DWGS CARTER POND\IN PROGRESS\SHEETS NICK.NAVARRO

21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

www.alphacorporation.com

RECORD DRAWING FOR

C9.DWGN:\JOBS\DULLES\572-100-C PRWI CAMP 5 AND CARTER POND ACCESS IMPROVEMENTS\5000 CIVIL\DWGS CARTER POND\IN PROGRESS\SHEETS NICK.NAVARRO

21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

www.alphacorporation.com

OUTFALL 1 PRE-DEVELOPMENT (10-YR) OUTFALL 1 POST-DEVELOPMENT (10-YR)

OUTFALL 2 PRE-DEVELOPMENT (10-YR) OUTFALL 2 POST-DEVELOPMENT (10-YR)

OUTFALL 3 PRE-DEVELOPMENT (10-YR) OUTFALL 3 POST-DEVELOPMENT (10-YR)

OUTFALL 4 PRE-DEVELOPMENT (10-YR) OUTFALL 4 POST-DEVELOPMENT (10-YR)

OUTFALL 5 PRE-DEVELOPMENT (10-YR) OUTFALL 5 POST-DEVELOPMENT (10-YR)

OUTFALL 6 PRE-DEVELOPMENT (10-YR) OUTFALL 6 POST-DEVELOPMENT (10-YR)

OUTFALL 7 PRE-DEVELOPMENT (10-YR) OUTFALL 7 POST-DEVELOPMENT (10-YR)

OUTFALL 8 PRE-DEVELOPMENT (10-YR) OUTFALL 8 POST-DEVELOPMENT (10-YR)

OUTFALL 9 PRE-DEVELOPMENT (10-YR) OUTFALL 9 POST-DEVELOPMENT (10-YR)

DRAINAGE AREA POST-DEVELOPMENT

SHEETFLOW VELOCITY COMPS

WATER QUANTITY NARRATIVE

SEE WATER QUALITY NARRATIVE ON SHEET C9 FOR DESCRIPTION OF SITE.

THERE ARE NINE (9) SHEET FLOW AREAS ON THE SITE.

OUTFALL #1 THROUGH #9: ALL SITE OUTFALLS ARE UPSTREAM FROM THE POND WITH THE EXCEPTION OF SHEET FLOW AREAS #1 AND #2 WHERE THE RUNOFF FORM THESE AREAS DISCHARGE TO WOODED AREAS DOWNSTREAM OF THE POND. IN THE PRE-DEVELOPMENT CONDITION, THE OUTFALLS RECEIVES DRAINAGE AS SHEETFLOW FROM WOODED COVER OUTSIDE THE SITE AND DISCHARGE THE RUNOFF ONTO A RELATIVELY FLAT WOODED AREAS DOWNSTREMA OF THE SITE. IN THE POST-DEVELOPMENT CONDITION, THE EXISTING GRADES AND THE DRAINAGE PATTERN IS HONORED WITH THE PROPOSED GRADING , AND THE RUNOFF CONTINUES TO LEAVE THE SITE AS SHEETFLOW IN A SIMILAR MANNER.

WATER QUANTITY REQUIREMENTS

ALL SITE OUTFALLS ARE SUBJECT TO THE REQUIREMENTS OF SECTION 9VAC25-870-66.D FOR INCREASED VOLUMES OF SHEETFLOW RESULTING FROM PERVIOUS OR DISCONNECTED IMPERVIOUS AREAS, THAT DO NOT CAUSE OR CONTRIBUTE TO EROSION, SEDIMENTATION, OR FLOODING OF DOWN GRADIENT PROPERTIES OR RESOURCES. A SITE VISIT WAS CONDUCTED IN APRIL OF 2021, AND NO SIGNS OF EXISTING EROSION, SEDIMENTATION, OR FLOODING WERE

OBSERVED ON OR AROUND THE SITE.

WATER QUANTITY COMPLIANCE

FOR ALL SITE OUTFALLS, WATER QUANTITY COMPLIANCE IS ACHIEVED BY KEEPING THE EXISTING SHEETFLOW CONDITIONS THAT WILL NOT CAUSE OR CONTRIBUTE TO DOWNSTREAM EROSION, SEDIMENTATION, OR FLOODING. IT IS NOTED THAT WHILE THE POST-DEVELOPMENT FLOW RATE IS INCREASED AT SOME OUTFALLS FROM THE PRE-DEVELOPMENT CONDITION, THE VOLUMETRIC VALUES REVEAL NEGLIGIBLE INCREASE IN POST-DEVELOPMENT DISCHARGE VOLUME COMPARING TO THE PRE-DEVELOPMENT CONDITIONS. IN ADDITION TO THE VOLUMETRIC COMPUTATIONS PROVIDED, THE MOST REPRESENTATIVE HYDROLOGIC FLOW PATH FOR THIS EACH OUTFALL WAS ANALYZED FOR PERMISSIBLE 2-YR VELOCITIES. THE RESULTANT VELOCITIES FOR EACH OF THE AREAS ARE BELOW PERMISSIBLE VELOCITIES REFERENCED IN VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK CHAPTER 5. SEE VELOCITY

COMPUTATIONS ON THIS SHEET AND FLOW PATH ON SHEET C8.

THE LIMITS OF ANALYSIS IS LOCATED AT THE SITE BOUNDARY SINCE THE REQUIREMENTS OF SECTIONS 9VAC25-870-66.B.3.A AND 9VAC25-870-66.C.2.B ARE

MET WITH THIS APPLICATION.

PEAK 10-YR FLOWS ARE CALCULATED UTILIZING SCS METHODOLOGY AND THE HYDRAFLOW HYDROGRAPH EXTENSION FOR AUTOCAD CIVIL 3D 2022

SOFTWARE.

SEE COMPLIANCE COMPUTATIONS ON THIS SHEET.

IT IS THE OPINION OF THE SIGNING ENGINEER THAT THE REQUIREMENTS OF SECTION 9VAC58-870-66 OF THE VSMP REGULATION HAVE BEEN MET WITH THIS APPLICATION. THEREFORE, COMPLIANCE WITH THE MINIMUM STANDARDS OF SECTION 9VAC25-870-66 SATISFIES THE REQUIREMENTS OF SUBDIVISION 19 OF

9VAC25-840-40.

C9.DWGN:\JOBS\DULLES\572-100-C PRWI CAMP 5 AND CARTER POND ACCESS IMPROVEMENTS\5000 CIVIL\DWGS CARTER POND\IN PROGRESS\SHEETS NICK.NAVARRO

21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

www.alphacorporation.com

OUTFALL POST-DEVELOPMENT SHEETFLOW DEPTH (10-YR)

FLEXIBLE POROUS PAVING; 2"

NOMINAL THICKNESS

6'-0"

AASHTO #57 STONE, 95%

COMPACTION (AASHTO T-180)

EX. SUBGRADE

BACKFILL AND

SEEDED EDGE

TRAIL

GEOTEXTILEREINFORCED CONCRETE

CURB, COLORED

CONCRETE

4"

1' -0

1'-0"

8"

6"

1 4" T

YP

6"

WEEP HOLE,

6'-0" O.C.

AASHTO #57 STONE

3"

TYP

ASPHALT PAVEMENT

95"5 1 /2"

2 1/4"

5 1 /2"

2 3 /4"

1 3 /8"

95" RAILRAIL SECTION

SEE NOTE 2

GRADE

RAIL

POST

POST

RAIL

1'-

1/2

4'

8'

4'- 3"

5 3/4"

5 3 /4"

9 1 /4"

2 3 /4"

ALPHA

CORPORATION

C10 [DETAILS].DWGN:\JOBS\DULLES\572-100-C PRWI CAMP 5 AND CARTER POND ACCESS IMPROVEMENTS\5000 CIVIL\DWGS CARTER POND\IN PROGRESS\SHEETS NICK.NAVARRO

21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

www.alphacorporation.com

8/27/249/16/24 jbello Polygon jbello

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CONCRETE FOOTING

4,000 PSI

GRADE

2.

5'

3.

0'

6.

0'

1.5'

LOCKING

HASP

12.3'

12.0' GATE OPENING

6.0'

INTERIOR

ROUND POST

(SEE NOTE 1)

EXTERIOR

SQUARE POST

(SEE NOTE 1)

12.3'

5.0'

C/L TO

C/L OF POST

FROM OUTSIDE

OF POST TO EP

EX EP

EX ROAD

C/L STRIPINGCLEAR

EX EP

MIN GATE

OPENING

12.0'

LATCHING POST

LATCHING

POST

DOUBLE SWING

BARRIER GATE

SEE DETAIL

THIS SHEET

3.0'

CLEAR

(MIN)

ALPHA

CORPORATION

C10 [DETAILS].DWGN:\JOBS\DULLES\572-100-C PRWI CAMP 5 AND CARTER POND ACCESS IMPROVEMENTS\5000 CIVIL\DWGS CARTER POND\IN PROGRESS\SHEETS NICK.NAVARRO

21000 ATLANTIC BLVD, S. 400

DULLES, VA 20166 (703)450-0800

www.alphacorporation.com

8/27/249/16/24 jbello Polygon jbello

Δ3