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EROSION CONTROL NARRATIVE:
OLD T
PROJECT DESCRIPTION
THE PURPOSE OF THIS PROJECT IS THE DEVELOPMENT OF LODGE AT OLD TRAIL PHASE 2 PARCEL, T.M.P. 55EO-01-F1, FOR A 10,500 SQUARE
FOOT OFFICE BUILDING AND SUPPORTING PARKING LOT. THE PARCEL IS 330 CLAREMONT LANE IN OLD TRAIL VILLAGE AND IT IS 0.811 ACRES.
THE PROJECT LIMITS, OR LIMITS OF DISTURBANCE, IS 0.811 ACRES. THE PARCEL IS CURRENTLY FLAT, DEVELOPED TURF AREA. THERE WILL
BE AN INCREASE OF IMPERVIOUS AREA WITHIN THE WORK LIMITS FROM 0 SQUARE FEET TO 27,800 SQUARE FEET AS A RESULT OF THE
CONSTRUCTION. STORM RUNOFF FROM THE DEVELOPED SITE WILL BE COLLECTED ON -SITE AND CONVEYED TO AND EXISTING SWM FACILITY
(L-2) BEHIND THE LODGE, WHICH HAS BEEN DESIGNED TO ACCOMMODATE DEVELOPMENT OF THIS PARCEL.
THE PROJECT START DATE IS SEPTEMBER 1, 2020 AND THE ANTICIPATED CONSTRUCTION DURATION IS 18 MONTHS.
PROJECT OWNER
RUTHERFORD HOSPITALITY, LLC
330 CLAREMONT LN
CROZET, VA 22932
CONTACT: DAVID HILLIARD(DAVIDHILLIARD@LODGEATOLDTRAIL.COM)
DEVELOPER
TURNER ENTERPRISES
250 WEST MAIN STREET, SUITE 201
CHARLOTTESVILLE, VA 22902
CROZET, JOHN THIER (JOHN@TURNER-ENTERPRISES.COM)
EXISTING SITE CONDITIONS
THE EXISTING SITE IS A RELATIVELY FLAT, DEVELOPED REMNANT AREA LEFT AS TURF AS PART OF THE LODGE AT OLD TRIAL CONSTRUCTION.
THE TERRAIN SLOPES AT 4% FROM THE BACK OF WALK ADJACENT TO CLAREMONT LANE TOWARDS THE LODGE PARKING LOT.
ADJACENT PROPERTY
THE PROPERTY IS SURROUNDED ON TWO SIDES BY THE LODGE AT OLD TRAIL IMPROVEMENTS AND ON THE OTHER TWO SIDES BY
SIDEWALKS ADJACENT TO CLAREMONT LANE AND GOLF DRIVE.
SOILS
DUE TO PREVIOUS DEVELOPMENT THE SOILS HAVE BEEN DISTURBED BUT ACCORDING TO THE USDA WEB SITE THE ORIGINAL SITE SOILS
WERE DYKE SILT LOAM AND DYKE CLAY LOAM. BOTH SOILS ARE HYDRAULIC SOILS GROUP B.
CRITICAL EROSION AREAS
NO CRITICAL EROSION OR ENVIRONMENTALLY SENSITIVE AREAS ARE ANTICIPATED WITH THIS PROJECT.
OFF -SITE AREAS
DUE TO THE INFILL NATURE OF THIS PROJECT, SMALL AREAS OUTSIDE THE PERIMETER OF THE PROPERTY WILL BE DISTURBED WITH MINIMAL
GRADING AND UTILITY CONNECTIONS TO THE LODGE AT OLD TRAIL PROPERTY AND WITHIN THE PUBLIC R.O.W. OF ADJACENT STREETS.
EROSION & SEDIMENT CONTROL MEASURES
UNLESS OTHERWISE INDICATED, ALL STRUCTURAL AND VEGETATIVE EROSION AND SEDIMENT CONTROL MEASURES WILL BE CONSTRUCTED
AND MAINTAINED ACCORDING TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE VIRGINIA EROSION AND SEDIMENT CONTROL
HANDBOOK, LATEST EDITION.
TEMPORARY CONSTRUCTION ENTRANCE - E&S STD. & SPEC. 3.02
A TEMPORARY CONSTRUCTION ENTRANCE SHALL BE INSTALLED WHERE INDICATED. THE CONSTRUCTION ENTRANCE SHALL BE PAVED WITH
A WASH RACK.
SILT FENCE - E&S STD. & SPEC. 3.05
SILT FENCE SHALL BE INSTALLED IN A SEQUENCED MANNER AS SHOWN ON THE PLAN.
INLET PROTECTION - E&SC STD. SPECIFICATION 3.07
SILT FENCE PROTECTION OR EXCAVATED IMPOUNDING AREA INSTALLED AT THE STORM DRAIN DROP INLETS AS SHOWN ON PLANS.
TOPSOILING - E&SC STD. SPECIFICATION 3.30
STRIPPING, PRESERVING, AND REUSING THE TOP LAYER OF EXISTING SOIL IN ORDER TO OBTAIN MORE DESIRABLE GROWTH MEDIUM.
TEMPORARY SEEDING: E&S STD. & SPEC. 3.31
ALL AREAS DISTURBED BY CONSTRUCTION THAT WILL NOT BE BROUGHT TO FINAL GRADE FOR A PERIOD OF MORE THAN 30 DAYS WILL BE
STABILIZED WITH TEMPORARY SEEDING. UNLESS OTHERWISE SPECIFIED, TEMPORARY SEEDING WILL BE DONE WITH A SEED MIX APPROVED
BY THE OWNER PRIOR TO APPLICATION IN ACCORDANCE TO E&S STD. AND SPEC. 3.31 OF THE 1992 VIRGINIA EROSION AND SEDIMENT
CONTROL HANDBOOK, THIRD EDITION (1992).
PERMANENT SEEDING: E&S STD. & SPEC. 3.32
ALL AREAS DISTURBED BY CONSTRUCTION WILL BE STABILIZED WITH PERMANENT SEEDING IMMEDIATELY FOLLOWING THE CONCLUSION OF
CLEARING OPERATIONS. UNLESS OTHERWISE SPECIFIED, PERMANENT SEEDING WILL BE DONE WITH A SEED MIX APPROVED BY THE OWNER
PRIOR TO APPLICATION IN ACCORDANCE TO E&S STD. AND SPEC. 3.32 OF THE 1992 VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK,
THIRD EDITION (1992).
SODDING - E&SC STD. SPECIFICATION 3.33
STABILIZING FINE GRADED DISTURBED AREAS WITH SOD.
MULCHING - E&SC STD. SPECIFICATION 3.35
APPLICATION OF PLANT RESIDUES OR OTHER SUITABLE MATERIALS TO THE SOIL SURFACE.
SOIL STABILIZATION BLANKETS & MATTING - E&SC STD. SPECIFICATION 3.36.
THE INSTALLATION OF A SOIL STABILIZATION MAT ON A PREPARED PLANTING AREA OF STEEP SLOPE.
DUST CONTROL - E&S STD. & SPEC. 3.39
DUST CONTROL PRACTICES SHALL BE EMPLOYED TO PREVENT SURFACE AND AIR MOVEMENT OF DUST FROM EXPOSED SOIL SURFACES AND
REDUCE THE PRESENCE OF AIRBORNE SUBSTANCES WHICH MAY BE HARMFUL OR INJURIOUS TO HUMAN HEALTH, WELFARE, OR SAFETY, OR
TO ANIMAL OR PLANT LIFE.
MANAGEMENT STRATEGIES
1. CONSTRUCTION WILL BEGIN AS SOON AS SOON AS A PRE -CONSTRUCTION MEETING HAS BEEN HELD WITH CITY SITE INSPECTOR.
2. CONSTRUCTION WILL BE SEQUENCED SO THAT GRADING OPERATIONS CAN BEGIN AND END AS QUICKLY AS POSSIBLE.
3. AREAS WHICH ARE OUTSIDE THE CONSTRUCTION LIMITS AND NOT TO BE DISTURBED SHALL BE CLEARLY MARKED.
4. TREE PROTECTION SHALL BE INSTALLED BEFORE ANY GRADING ACTIVITIES COMMENCE AND BEFORE EQUIPMENT AND MATERIAL
STORAGE AREAS ARE ESTABLISHED.
5. SEDIMENT TRAPPING MEASURES SHALL BE INSTALLED AS A FIRST STEP IN GRADING AND WILL BE SEEDED AND MULCHED IMMEDIATELY
FOLLOWING INSTALLATION.
RAIL MEDICAL
OFF
CES
WPO: VSMP PLAN
WP02020-00047
AUGUST 6, 2020
6. MATTING AND SEEDING, WHETHER TEMPORARY OR PERMANENT, WILL FOLLOW IMMEDIATELY AFTER GRADING
7. THE SITE CONTRACTOR SHALL BE RESPONSIBLE FOR THE INSTALLATION AND MAINTENANCE OF ALL EROSION AND SEDIMENT CONTROL
PRACTICES.
8. SOIL STOCKPILES SHALL BE STABILIZED WITH TEMPORARY SEEDING AND SILT FENCE.
9. AFTER ACHIEVING ADEQUATE STABILIZATION, THE TEMPORARY EROSION AND SEDIMENT CONTROLS WILL BE CLEANED UP AND
REMOVED AND FINAL GRADES ESTABLISHED ACCORDING TO THE GRADING PLAN FOR THE PROJECT.
MAINTENANCE
IN GENERAL, ALL EROSION AND SEDIMENT CONTROL MEASURES WILL BE CHECKED DAILY AND AFTER EACH SIGNIFICANT RAINFALL. THE
FOLLOWING ITEMS WILL BE CHECKED IN PARTICULAR:
1. THE INLET PROTECTION WILL BE CHECKED REGULARLY FOR SEDIMENT CLEANOUT.
2. THE GRAVEL OUTLETS WILL BE CHECKED REGULARLY FOR SEDIMENT BUILDUP WHICH WOULD PREVENT DRAINAGE. IF THE GRAVEL IS
CLOGGED BY SEDIMENT, IT SHALL BE REMOVED AND CLEANED OR REPLACED.
3. THE SILT FENCE BARRIER WILL BE CHECKED REGULARLY FOR UNDERMINING OR DETERIORATION OF THE FABRIC. SEDIMENT SHALL BE
REMOVED WHEN THE LEVEL OF SEDIMENT DEPOSITION REACHES HALF WAY TO THE TOP OF THE BARRIER.
4. THE SEEDED AREAS WILL BE CHECKED REGULARLY TO ENSURE THAT A GOOD STAND IS MAINTAINED. AREAS SHALL BE FERTILIZED AND
RESEEDED AS DETERMINED NECESSARY BY THE COUNTY AGENT.
PERMANENT STABILIZATION
IMPERVIOUS AREAS WILL BE STABILIZED WITH A GRAVEL/TAR AND CHIP SURFACE OR CONCRETE. ALL OTHER DISTURBED AREAS WILL BE
STABILIZED WITH TURF PER THE REFERENCED SEEDING, FERTILIZATION, AND MULCHING STANDARDS, OR SOD.
STORMWATER RUNOFF CONSIDERATIONS
STORMWATER MANAGEMENT FOR THIS PROJECT IS PROVIDED IN EXISTING SWM FACILITY L-2 LOCATED BEHIND THE LODGE AT OLD TRAIL.
SWM L-2 FACILITY IS A RETENTION BASIN III (4XWQV) WITH AQUATIC BENCH DESIGNED WITH THE CAPACITY TO MANAGE STORMWATER FROM
A TOTAL DRAINAGE AREA OF APPROXIMATELY 24.0 ACRES CONTAINING APPROXIMATELY 16.5 ACRES OF IMPERVIOUS COVER.
STATE MINIMUM STANDARDS
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, 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 TWENTY-FIVE 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 REGULATIONS PERTAINING TO WORKING IN OR CROSSING LIVE WATERCOURSES SHALL BE
MET.
SHEET 2
SHEET 3
SHEET 4
SHEET 5
APPROVALS
ENGINEER
EX. CONDITIONS/EROSION CONTROL PLAN - STAGE 'A'
EROSION & SEDIMENT CONTROL PLAN - STAGE 'B'
EROSION & SEDIMENT CONTROL DETAILS
STORMWATER MANAGEMENT ASSESSMENT
APPROVED
by the Albemarle County
Community Development Department
Date 10/29/2020
File WP0202000047
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 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 THESE REGULATIONS.
f. APPLICABLE SAFETY REGULATIONS 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 LOCAL PROGRAM
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:
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
ONE HUNDRED 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
OVERALL PREVIOUSLY CONSTRUCTED MTOP CHANNEL BANKS NOR CAUSE EROSION OF CHANNEL BED OR BANKS; AND
(b) ALL MAN-MADE CHANNELS SHALL BE ANALYZED BY THE USE OF A TEN-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 TEN-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 CHANNEL TO A CONDITION WHERE A TEN-YEAR STORM WILL NOT OVERTOP THE BANKS AND A TWO-YEAR
STORM WILL NOT CAUSE EROSION TO THE CHANNEL BED OR BANKS; OR
(2) IMPROVE THE PIPE OR PIPE SYSTEM TO A CONDITION WHERE THE TEN-YEAR STORM IS CONTAINED WITHIN THE
APPURTENANCES;OR
(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 TEN-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 PLAN -APPROVING 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 OF THE SUBJECT PROJECT.
f. IF THE APPLICANT CHOOSES AN OPTION THAT INCLUDES STORMWATER DETENTION HE SHALL OBTAIN APPROVAL FROM THE
LOCALITY 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 RUNOFF 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.
Alan Franklin PE, LLC
Civil and Site Plan Engineering
427 Cranberry Lane Crozet, VA 22932
434-531-5544
alan@alanfranklinpe.com
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Alan G. Franklin
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ISSUED: 08-06-2(
SCALE:
REVISIONS:
1. 10-28-20 - COUNTY COMMENTS
SHEET
SOILS GROUP 25B
SOILS GROUP 26C3
DYKE SILT LOAM, 2 TO 7% SLOPES
DYKE CLAY LOAM, 7 TO 15% SLOPES
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TOP GRATE=690.63'
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(RESIDENTIAL)- -
TMP 55E 1 G 1
I GEARHART, TIMOTHY J
OR LAUREN D
D.B. 5217 PG, 001
NMD ZONING
(RESIDENTIAL)
LIMITS OF
DISTURBANCE,
TYP. (0.99 ACRES)
- BUILDING LINE
SD CURB INLET W/GRATE
TOP GRATE=694.72'
INV. IN=685.21' 18" CPP (NW)
INV. IN=681.22'24" PLASTIC (SW)
INV. OUT=681.12'24"PLASTIC (NE)
SD CURB INLET W/GRATE
TOP GRATE=694.80'
INV. IN=685.90' 18" CPP (NW)
INV. OUT=68580' 18" CPP(SE)
f in
T I
SO CURB INLET
SD CURB INLET
W/ GRATE
W/ GRATE
II TOP GRATE=694.37'
TOP GRATE=695.47'
INV. IN=688.02' 15" RCP (S)
INV. OUT=689.92' 15" CPP (NE)
INV. IN=688.02' 15" RCP (NW)
INV. OUT=687
79' 15" RCP (NE)
GENERAL
EROSION & SEDIMENT CONTROL NOTES
CONSTRUCTION SEQUENCE
E&SC MEASURES
1.
UNLESS OTHERWISE INDICATED, ALL VEGETATIVE AND STRUCTURAL EROSION AND 11.
ALL WASTE MATERIALS SHALL BE TAKEN TO AN APPROVED WASTE AREA. EARTH FILL
1. NOTIFY THE EROSION CONTROL INSPECTOR 48 HOURS PRIOR TO BEGINNING CONSTRUCTION.
CONSTRUCTION CONSTRUCTION ENTRANCE E&SC STD. 3.02 1 EA
SEDIMENT CONTROL PRACTICES WILL BE CONSTRUCTED AND MAINTAINED ACCORDING
SHALL BE INERT MATERIALS ONLY, FREE OF ROOTS, STUMPS, WOOD, RUBBISH, AND
TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE VIRGINIA EROSION AND SEDIMENT
OTHER DEBRIS.
2. INSTALL CONSTRUCTION ENTRANCE AT LOCATIONS SHOWN ON PLAN AND CLEARLY DEMARCATE
SF SILT FENCE E&SC STD. 3.06 405 LF
CONTROL HANDBOOK AND VIRGINIA REGULATIONS VR 625-02-00 EROSION AND SEDIMENT
THE LIMITS OF WORK.
CONTROL REGULATIONS. 12.
BORROW, FILL OR WASTE ACTIVITY SHALL BE CONDUCTED IN A SAFE MANNER THAN
IP INLET PROTECTION E&SC STD. 3.07 4 EA
MAINTAINS LATERAL SUPPORT, OR ORDER TO MINIMIZE ANY HAZARD TO PERSONS,
3. INSTALL ALL PERIMETER EROSION CONTROL MEASURES SUCH AS SILT FENCE AND INLET
2.
THE PLAN APPROVING AUTHORITY MUST BE NOTIFIED ONE WEEK PRIOR TO THE
PHYSICAL DAMAGE TO ADJACENT LAND AND IMPROVEMENTS, AND DAMAGE TO ANY
PROTECTION ON EXISTING DRAIN INLETS.
TQ TOPSOILING E&SC STD. 3.30 0.40 AC
PRE -CONSTRUCTION CONFERENCE, ONE WEEK PRIOR TO THE COMMENCEMENT OF LAND
PUBLIC STREET BECAUSE OF SLIDES, SINKING, OR COLLAPSE.
DISTURBING ACTIVITY, AND ONE WEEK PRIOR TO THE FINAL INSPECTION.
4. ESTABLISH LAY -DOWN, CONSTRUCTION PARKING/STAGING, AND MATERIAL STOCKPILE AREAS IN
13.
TEMPORARY STABILIZATION SHALL BE TEMPORARY SEEDING AND MULCHING. SEEDING IS
LOCATION SHOWN ON PLANS.
TEMPORARY SEEDING E&SC STD. 3.31 0.25 AC
3.
ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR TO OR AS
TO BE AT 75 LBS/ACRE, AND IN THE MONTHS OF SEPTEMBER TO FEBRUARY TO CONSIST A
THE FIRST STEP IN CONSTRUCTION.
50/50 MIX OF ANNUAL RYEGRASS AND CEREAL WINTER RYE, OR IN MARCH AND APRIL TO
5. PERFORM ANY DEMOLITION ACTIVITIES REQUIRED TO EXECUTE THE APPROVED EROSION
PS PERMANENT SEEDING E&SC STD. 3.32 0.25 AC
CONSIST OF ANNUAL RYE, OR MAY THROUGH AUGUST TO CONSIST OF GERMAN MILLET.
CONTROL PLAN.
4.
A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL PLAN SHALL BE
STRAW MULCH IS TO BE APPLIED AT 80LBS/100SF. ALTERNATIVES ARE SUBJECT TO
SO SOD E&SC STD. 3.33 0.10 AC
MAINTAINED ON THE SITE AT ALL TIMES.
APPROVED BY THE EROSION CONTROL INSPECTOR.
6. STRIP TOPSOIL AND STORE IN STOCKPILE AREA, 8' HEIGHT MAX. DISPOSE OF DEBRIS AND
ADDITIONAL SOILS APPROPRIATELY.
MULCHING E&SC STD. 3.35 0.25 AC
5.
PRIOR TO COMMENCING LAND DISTURBING ACTIVITIES IN AREAS OTHER THAN INDICATED 14.
PERMANENT SEEDING, LIME, FERTILIZATION, AND MULCHING IS TO BE APPLIED TO ALL
ON THESE PLANS( INCLUDING, BUT NOT LIMITED TO, OFF -SITE BORROW OR WASTE AREAS),
AREAS NOT PROPOSED FOR HARDSCAPE OR BUILDING IMPROVEMENTS AS SOON AS
7. ESTABLISH NEW SITE GRADES AND STORM DRAIN INFRASTRUCTURE WITH INLET PROTECTION.
DC DUST CONTROL E&SC STD. 3.39 0.75 AC
THE CONTRACTOR SHALL SUBMIT A SUPPLEMENTARY EROSION CONTROL PLAN TO THE
POSSIBLE. PERMANENT STABILIZATION SHALL BE LIME AND FERTILIZER, PERMANENT
OWNER FOR REVIEW AND APPROVAL BY THE PLAN APPROVING AUTHORITY.
SEEDING, AND MULCH. AGRICULTURAL GRADE LIMESTONE SHALL BE APPLIED AT
8. APPLY EROSION CONTROL MATTING ON ALL SLOPES GREATER THAN 3:1.
90LBS/1000SF, THE TOP 4-6 INCHESFERTILIZER BE
RATED L.
SOILS
INFO:
6.
THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY ADDITIONAL EROSION
APPLIED AT 1000LBS/ACORE ANDINTO CONSIST OF A 10-20-10 UOTR ENIT MIX. PERMA ENTLL
9 STABILIZE PARKING LOT AREAS, BUILDING PADS, AND SIDEWALK AREAS WITH GRAVEL OR
CONTROL MEASURES NECESSARY TO PREVENT EROSION AND SEDIMENTATION AS
SEEDING SHALL BE TURF -TALL FESCUE APPLIED AT 200-250 LBS/ACRE, UNLESS
PAVEMENT AND ESTABLISH TURF VEGETATION ON ALL NON -PAVED AREAS THAT HAVE BEEN
SOILS GROUP 25B DYKE SILT LOAM, 2 TO 7% SLOPES
DETERMINED BY THE PLAN APPROVING AUTHORITY.
OTHERWISE SPECIFIED BY THE ARCHITECT. STRAW MULCH IS TO BE APPLIED AT
DISTURBED.
SOILS GROUP 26C3 DYKE CLAY LOAM, 7 TO 15% SLOPES
80LBS/100SF. ALTERNATIVES ARE SUBJECT TO APPROVED BY THE EROSION CONTROL
7.
ALL DISTURBED AREAS ARE TO DRAIN TO APPROVED SEDIMENT CONTROL MEASURES AT
INSPECTOR.
10. ONCE PERMANENT VEGETATION IS ESTABLISHED AND UPON APPROVAL OF THE ENGINEER OR
ALL TIMES DURING LAND DISTURBING ACTIVITIES AND DURING SITE DEVELOPMENT UNTIL
LANDSCAPE ARCHITECT, SCHEDULE A FINAL INSPECTION BY THE COUNTY EROSION CONTROL
FINAL STABILIZATION IS ACHIEVED. 15.
MAINTENANCE: ALL MEASURES ARE TO BE INSPECTED WEEKLY AND AFTER EACH
OFFICER.
RAINFALL. ANY DAMAGE OR CLOGGING TO STRUCTURAL MEASURES IS TO BE REPAIR
8.
DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN APPROVED
IMMEDIATELY. SILT TRAPS ARE TO BE CLEANED WHEN 50% OF THE WET STORAGE VOLUME
11. ONCE SITE IS DEEMED STABILIZED BY THE COUNTY EROSION CONTROL INSPECTOR AND ALL
FILTERING DEVICE.
IS FILLED WITH SEDIMENT. ALL SEEDED AREAS ARE TO BE RESEEDED WHEN NECESSARY
CONSTRUCTION ACTIVITIES ARE COMPLETED, RESTORE STAGING AND ACCESS AREAS TO
TO ACHIEVE A GOOD STAND OF GRASS. SILT FENCE AND DIVERSION DIKES WHICH ARE
ACCEPTABLE (PRE -CONSTRUCTION) CONDITIONS AND REMOVE ALL EROSION CONTROL
9.
THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES PERIODICALLY AND
COLLECTING SEDIMENT TO HALF THEIR HEIGHT MUST BE CLEANED AND REPAIRED
MEASURES.
AFTER EACH RUNOFF PRODUCING RAINFALL EVENT. ANY NECESSARY REPAIRS OR
IMMEDIATELY.
CLEANUP TO MAINTAIN THE EFFECTIVENESS OF THE EROSION CONTROL DEVICES SHALL
BE MADE IMMEDIATELY. 16.
ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE REMOVED
WITHIN 30 DAYS OF FINAL SITE STABILIZATION, WHEN MEASURES ARE NO LONGER
10.
ALL FILL MATERIAL SHALL BETAKEN FROM AN APPROVED. DESIGNATED BORROW AREA.
NEEDED. SUBJECT TO APPROVAL BY THE EROSION CONTROL INSPECTOR.
Alan Franklin PE, LLC
Civil and Site Plan Engineering
427 Cranberry Lane Crozet, VA 22932
434-531-5544
alan@alanfranklinpe.com
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Alan G. Franklin
Lic. No. 35326 w
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ISSUED: 08-06-2020
SCALE: 1" = 20'
REVISIONS:
1. 10-28-20 - COUNTY COMMENTS
I SHEET
OF 5
\\ SD CURB INLET
\\ W/ GRATE
\\ TOP GRATE=690.63'
\\ INV. OUT=688.48' 8"CPP (SE) SD CURB INLET
\\ SD CURB INLET W/ GRATE
O
0
SD CURB INLET \\ y
TOP=690.55' \P,
INV. IN=685.30' 15" CPP (NW)
INV. OUT 45' 18" CPP (SE) \\
CURB INLET \
IP PROTECTION��\\
II
_ II
�I\ I
�Ia
TMP 55E-1-F
PIEDMONT SENIOR JONG\_ j
REAL ESTATE, LLC
D.B. 3812, PG. 4 7
NMD ZONINII
(ASS/STED LIVING)
I• � I
II
LIMITS OF \
DISTURBANCE, �I \
TYP. (0.99 ACRES)
TOP=689.99 TOP GRATE=688.00'
INV. IN=684.69' 18"CPP (NW) l V. IN=682.65'24"PLASTIC (SW)
INV. 1N=685.74' 8" CPP (NE) INV. IN=682.65' 18" CPP (NW)
INV. OUT=684.49'24"PLASTIC (SE) TMP 55E-1-F I V.OUT=682.55'24"
PIEDMONT SENIOR LIVING REAL ESTATE, LLC CURB INLET
SILT FENCE D.B. 3812, PG. 497 IP PROTECTION
1sF( ALONG EX. NMD ZONING SOILS 26C3 \
(ASSISTED LIVING)
BACK OF CURB ��9- -
JACK 69�)-
6PA KING SPACES ---------------- „ -
MU - \ ---- - --
I
- --- j- - IP I
I I
I
�693--------- - - -
J
'URB INLET
I (-Ivrx t-r-M4�- -
STOCKPILES
I
I I � -1 I -
1N- -SAN- - - -SAN- - - - -SAN -
--------------------------------------/
STAGING AREA I -
/6lP I
_ 9' - I
6 �
3 MU PROP- - - - - - -- I
UTILITIES
I i�
I
I I � I
1 - STAGING AREA. I /
v- `) I
----� 5
UGP-
UCATV UCATV \
- SAN- - - - SAN- -
FEE
UTILIZE EX.
\ HYDRANT FOIR
WASH WATEk
OSILT FENCE
ALONG
SF ALONG EX.
BACK OF W/�LK
I �
I �
I
PAVED `
- CONSTRUCTION I
-ENTRANCE CE
� I
PROP. _
UTILITIES /
SOILS 25B
1w�WN �,__
i Y SD CURB I
W/ GRATE
TOP GRA 7
„JI INV. 1N=68:
INV. OUT=!
i
\18"HOPE
4 PARKINGI SPACES I�� \ �����������1 //,Y I 2 PARKING I SPACES ` 3
EX ACSA MH(OldTrlVil-1-6)
TOP=695.10' C&G
I4
INV. 1N=687 50' 8" PVC (W) o �\
INV. OUT=68735'8"PVC(NW) - f II? GUREMOIr� V 1 'LANIF- \ Q \
I Ih (61' PUBLIC R.O.W.) I \
--w---- -W - - -w H-w- w-----w----w- h L�
-terw� wa
I I I SD CURB INLET _ - - _ -
SD CURB INLET W/GRATE
INV. 1N=bbff.JU'75H
INV. IN=689.34' 15" CPP (SW) I I V. OUT=687 33' 18" CPP (SE)
INV. OUT=689.28' 15"CPP(NW) 3 I
SD CURB INLET 7TMP-1-C SD CURB INLET
W/ GRATE W/GRATE
TOP GRATE=695.47' OLD TRAIL VILLAGE CENTER, LL��_ TOP GRATE=694.37'
D.B. , . 4646 INV. IN=688.02' 15" RCP (S)
INV. OUT=689.92' 15"CPP (NE) 4978PGINV. IN=688.02' 15" RCP (NW)
NMD ZONING INV. OUT=687 79' 15" RCP (NE)
/AA/VClI I /CC =0/ALA1 r1A/ &1f'1AAAA=Mf11A I 1
GENERAL EROSION & SEDIMENT CONTROL NOTES CONSTRUCTION SEQUENCE E&SC MEASURES
1. UNLESS OTHERWISE INDICATED, ALL VEGETATIVE AND STRUCTURAL EROSION AND 11. ALL WASTE MATERIALS SHALL BE TAKEN TO AN APPROVED WASTE AREA. EARTH FILL 1. NOTIFY THE EROSION CONTROL INSPECTOR 48 HOURS PRIOR TO BEGINNING CONSTRUCTION. CONSTRUCTION CONSTRUCTION ENTRANCE E&SC STD. 3.02 1 EA
SEDIMENT CONTROL PRACTICES WILL BE CONSTRUCTED AND MAINTAINED ACCORDING SHALL BE INERT MATERIALS ONLY, FREE OF ROOTS, STUMPS, WOOD, RUBBISH, AND
TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE VIRGINIA EROSION AND SEDIMENT OTHER DEBRIS. 2. INSTALL CONSTRUCTION ENTRANCE AT LOCATIONS SHOWN ON PLAN AND CLEARLY DEMARCATE SF SILT FENCE E&SC STD. 3.06 405 LF
CONTROL HANDBOOK AND VIRGINIA REGULATIONS VR 625-02-00 EROSION AND SEDIMENT THE LIMITS OF WORK.
CONTROL REGULATIONS. 12. BORROW, FILL OR WASTE ACTIVITY SHALL BE CONDUCTED IN A SAFE MANNER THAN Ip INLET PROTECTION E&SC STD. 3.07 4 EA
MAINTAINS LATERAL SUPPORT, OR ORDER TO MINIMIZE ANY HAZARD TO PERSONS, 3. INSTALL ALL PERIMETER EROSION CONTROL MEASURES SUCH AS SILT FENCE AND INLET
2. THE PLAN APPROVING AUTHORITY MUST BE NOTIFIED ONE WEEK PRIOR TO THE PHYSICAL DAMAGE TO ADJACENT LAND AND IMPROVEMENTS, AND DAMAGE TO ANY PROTECTION ON EXISTING DRAIN INLETS. TO TOPSOILING E&SC STD. 3.30 0.40 AC
PRE -CONSTRUCTION CONFERENCE, ONE WEEK PRIOR TO THE COMMENCEMENT OF LAND PUBLIC STREET BECAUSE OF SLIDES, SINKING, OR COLLAPSE.
DISTURBING ACTIVITY, AND ONE WEEK PRIOR TO THE FINAL INSPECTION. 4. ESTABLISH LAY -DOWN, CONSTRUCTION PARKING/STAGING, AND MATERIAL STOCKPILE AREAS IN TS TEMPORARY SEEDING E&SC STD. 3.31 0.25 AC
13. TEMPORARY STABILIZATION SHALL BE TEMPORARY SEEDING AND MULCHING. SEEDING IS LOCATION SHOWN ON PLANS.
3. ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR TO OR AS TO BE AT 75 LBS/ACRE, AND IN THE MONTHS OF SEPTEMBER TO FEBRUARY TO CONSIST A
THE FIRST STEP IN CONSTRUCTION. 50/50 MIX OF ANNUAL RYEGRASS AND CEREAL WINTER RYE, OR IN MARCH AND APRIL TO 5. PERFORM ANY DEMOLITION ACTIVITIES REQUIRED TO EXECUTE THE APPROVED EROSION PS PERMANENT SEEDING E&SC STD. 3.32 0.25 AC
CONSIST OF ANNUAL RYE, OR MAY THROUGH AUGUST TO CONSIST OF GERMAN MILLET. CONTROL PLAN. SO SOD E&SC STD. 3.33 0.10 AC
4. A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL PLAN SHALL BE STRAW MULCH IS TO BE APPLIED AT 80LBS/100SF. ALTERNATIVES ARE SUBJECT TO
MAINTAINED ON THE SITE AT ALL TIMES. APPROVED BY THE EROSION CONTROL INSPECTOR. 6. STRIP TOPSOIL AND STORE IN STOCKPILE AREA, 8' HEIGHT MAX. DISPOSE OF DEBRIS AND
ADDITIONAL SOILS APPROPRIATELY. MULCHING E&SC STD. 3.35 0.25 AC
5. PRIOR TO COMMENCING LAND DISTURBING ACTIVITIES IN AREAS OTHER THAN INDICATED 14. PERMANENT SEEDING, LIME, FERTILIZATION, AND MULCHING IS TO BE APPLIED TO ALL
ON THESE PLANS( INCLUDING, BUT NOT LIMITED TO, OFF -SITE BORROW OR WASTE AREAS), AREAS NOT PROPOSED FOR HARDSCAPE OR BUILDING IMPROVEMENTS AS SOON AS 7. ESTABLISH NEW SITE GRADES AND STORM DRAIN INFRASTRUCTURE WITH INLET PROTECTION. DC DUST CONTROL E&SC STD. 3.39 0.75 AC
THE CONTRACTOR SHALL SUBMIT A SUPPLEMENTARY EROSION CONTROL PLAN TO THE POSSIBLE. PERMANENT STABILIZATION SHALL BE LIME AND FERTILIZER, PERMANENT
OWNER FOR REVIEW AND APPROVAL BY THE PLAN APPROVING AUTHORITY. SEEDING, AND MULCH. AGRICULTURAL GRADE LIMESTONE SHALL BE APPLIED AT 8. APPLY EROSION CONTROL MATTING ON ALL SLOPES GREATER THAN 3:1.
90LBS/1000SF, INCORPORATED THE TOP 4-6FERTILIZER
6. THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY ADDITIONAL EROSION APPLIED AT 000LBS/ACRE ANDINTO CONSIST OF A 10- 0 10E UOTR ENIT L. MIX. PERMA ENTLL BE 9 STABILIZE PARKING LOT AREAS, BUILDING PADS, AND SIDEWALK AREAS WITH GRAVEL OR SOILS INFO.
CONTROL MEASURES NECESSARY TO PREVENT EROSION AND SEDIMENTATION AS SEEDING SHALL BE TURF -TALL FESCUE APPLIED AT 200-250 LBS/ACRE, UNLESS PAVEMENT AND ESTABLISH TURF VEGETATION ON ALL NON -PAVED AREAS THAT HAVE BEEN SOILS GROUP 25B DYKE SILT LOAM, 2 TO 7% SLOPES
DETERMINED BY THE PLAN APPROVING AUTHORITY. OTHERWISE SPECIFIED BY THE ARCHITECT. STRAW MULCH IS TO BE APPLIED AT DISTURBED. SOILS GROUP 26C3 DYKE CLAY LOAM, 7 TO 15% SLOPES
80LBS/100SF. ALTERNATIVES ARE SUBJECT TO APPROVED BY THE EROSION CONTROL
7. ALL DISTURBED AREAS ARE TO DRAIN TO APPROVED SEDIMENT CONTROL MEASURES AT INSPECTOR. 10. ONCE PERMANENT VEGETATION IS ESTABLISHED AND UPON APPROVAL OF THE ENGINEER OR
ALL TIMES DURING LAND DISTURBING ACTIVITIES AND DURING SITE DEVELOPMENT UNTIL LANDSCAPE ARCHITECT, SCHEDULE A FINAL INSPECTION BY THE COUNTY EROSION CONTROL
FINAL STABILIZATION IS ACHIEVED. 15. MAINTENANCE: ALL MEASURES ARE TO BE INSPECTED WEEKLY AND AFTER EACH OFFICER.
RAINFALL. ANY DAMAGE OR CLOGGING TO STRUCTURAL MEASURES IS TO BE REPAIR
8. DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN APPROVED IMMEDIATELY. SILT TRAPS ARE TO BE CLEANED WHEN 50% OF THE WET STORAGE VOLUME 11. ONCE SITE IS DEEMED STABILIZED BY THE COUNTY EROSION CONTROL INSPECTOR AND ALL
FILTERING DEVICE. IS FILLED WITH SEDIMENT. ALL SEEDED AREAS ARE TO BE RESEEDED WHEN NECESSARY CONSTRUCTION ACTIVITIES ARE COMPLETED, RESTORE STAGING AND ACCESS AREAS TO
TO ACHIEVE A GOOD STAND OF GRASS. SILT FENCE AND DIVERSION DIKES WHICH ARE ACCEPTABLE (PRE -CONSTRUCTION) CONDITIONS AND REMOVE ALL EROSION CONTROL
9. THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES PERIODICALLY AND COLLECTING SEDIMENT TO HALF THEIR HEIGHT MUST BE CLEANED AND REPAIRED MEASURES.
AFTER EACH RUNOFF PRODUCING RAINFALL EVENT. ANY NECESSARY REPAIRS OR IMMEDIATELY.
CLEANUP TO MAINTAIN THE EFFECTIVENESS OF THE EROSION CONTROL DEVICES SHALL
BE MADE IMMEDIATELY. 16. ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE REMOVED
WITHIN 30 DAYS OF FINAL SITE STABILIZATION, WHEN MEASURES ARE NO LONGER
10. ALL FILL MATERIAL SHALL BETAKEN FROM AN APPROVED. DESIGNATED BORROW AREA. NEEDED. SUBJECT TO APPROVAL BY THE EROSION CONTROL INSPECTOR.
61'
!"PLASTIC (NW)
24" PLASTIC (NE)
BUILDING LINE
SOILS DIVIDE,
TYP.
0 10, 20' 40'
BUILDING LINE
TMP 55E-1-G-7
LEW, JOHNK& SUE
RAYMOND-LEW
NMD ZONING
(RESIDENTIAL)- -
TMP 55E 1 G 1
I GEARHART, TIMOTHY J
OR LAUREN D
D.B. 5217 PG. 001
NMD ZONING
(RESIDENTIAL)
LIMITS OF
DISTURBANCE,
TYP. (0.99 ACRES)
/__ BUILDING LINE
SD CURB INLET W/GRATE
TOP GRATE=694.72'
INV. 1N=685.21' 18" CPP (NW)
INV. IN=681.22'24" PLASTIC (SW)
INV. OUT=681.12'24"PLASTIC (NE)
SD CURB INLET W/GRATE
TOP GRATE=694.80'
INV. IN=685.90' 18" CPP (NW)
INV. OUT=685.80' 18" CPP(SE)
m,m
Alan Franklin PE, LLC
Civil and Site Plan Engineering
427 Cranberry Lane Crozet, VA 22932
434-531-5544
alan@alanfranklinpe.com
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Alan G. Franklin
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�S/_UNAL
ISSUED: 08-06-2020
SCALE: 1" = 20'
REVISIONS:
1. 10-28-20 -COUNTY COMMENTS
I SHEET
OF 5
SOURCE: VA. DSWC
STONE �70' MIN.
CONSTRUCTION
ACCESS /�3" SM-2A ASPHALT TOP
/ COURSE EXISTING
2% // 2% PAVEMENT
�—
5" M N. 2'A AGDR_3ATE BASE
PROFILE
STONE 70' MIN.
CONSTRUCTION ASPHALT PAVED
ACCESS A WASHRACK
EXISTING
2% 2% PAVEMENT
1 Y96 12' MIN.*
*MUST EXTEND FULL WIDTH Lo `POSITIVE DRAINAGE
OF INGRESS AND EGRESS TO SEDIMENT
OPERATION TRAPPING DEVICE
PLAN
12 MIN. - —POSITIVE DRAINAGE
29 ITO SEDIMENT
TRAPPING DEVICE
FILTER CLOTH
SECTION A -A
A tttutitmmn water tap of 1 inch must be installed with a mitutmuu 1 itch ballcock
shutoff valve supplyikR a wash hose with a diameter of 1.5 inches for adequate
constant pressure. Wash water Hurst be carried away from tile entrance to an
approved settling area to remove sediment. All sediment shall be prevented from
ettterittg stone drains, ditches or watercourses.
PAVED WASH RACK
NO SCALE
ALBEMARLE COUNTY CONSTRUCTION ENTRANCE
SECTION
SOURCE: VA EROSION & SEDIMENT CONTROL MANUAL
C
E-001
N.T.S.
PLATE. 3.1-1
RUNOFF
WATER WITH OVER
SEDIMENT
\\
SEDIMENT
WIRE
2" X 4" WOOD STUD
—CURB INLET
TIERED WATER
IIIW
CURB INLET
SPECIAL APPLICATION
THIS METHOD OF INLET PROTECTION IS APPLICABLE AT
CURB INLETS WHERE AN OVERFLOW CAPABILITY IS NECESSARY
TO PREVENT EXCESSIVE PONDING IN FRONT OF THE STRUCTURE.
GRAVEL SHALL BE VDOT #3, #357 OR #5 COARSE AGGREGATE
PLATE 3.07-8 SOURCE: Adapted from Installation of Straw and Fabric Filter Barriers for Sediment Control,VA. DSWC PLATE. 3.05-2
Sherwood and Wyant
1. SET THE STAKES. 2. EXCAVATE A 4"X 4" TRENCH
UPSLOPE ALONG THE LINE OF
STAKES.
BLOCK & GRAVEL CURB INLET SEDIMENT FILTER
SECTION
E-008
N.T.S.
6'MAX.
FLOW]
3. STAPLE FILTER MATERIAL
TO STAKES AND EXTEND
IT INTO THE TRENCH.
4. BACKFILL AND COMPACT
THE EXCAVATED SOIL.
FLOW
SHEET FLOW INSTALLATION
(PERSPECTIVE VIEW)
POINTS A SHOULD BE HIGHER THAN POINT B.
DRAINAGEWAY INSTALLATION
(FRONT ELEVATION)
CONSTRUCTION OF A SILT FENCE
(WITHOUT WIRE SUPPORT)
DETAIL
1992
TABLE 3.32-D
SITE SPECIFIC SEEDING MIXTURES FOR PIEDMONT AREA
�.
Total Lbs.
Per Acre
Minimum Care Lawn
o
Commercial or Residential 175-200 lbs.
o
Kentucky 31 or Turf -Type Tall Fescue 95-100%
Improved Perennial Ryegrass 0-5%
Kentucky Bluegrass 0-5%
High -Maintenance Lawn 200-250lbs.
Kentucky 31 or Turf -Type Tall Fescue 100%
General Slope (3:1 or less)
- Kentucky 31 Fescue 128 lbs.
PERSPECTIVE VIEW
- Red Top Grass 21bs.
- Seasonal Nurse Crop * 20 lbs.
150 lbs.
Low -Maintenance Slope (Steeper than 3:1)
PERSPECTIVE VIEW
PLASTIC FENCE
SAFETY FENCE
ELEVATION
PERSPECTIVE VIEW
METAL FENCE
E-022
N.T.S.
ACCEPTABLE TEMPORARY SEEDING PLANT MATERIALS
QUICK REFERENCE FOR ALL REGIONS
RATE
PLANTING DATES SPECIES (LBS/ACRE)
SEPT. 1- FEB. 15
FEB. 16 - APR. 30
MAY 1 - AUG. 31
50/50 MIX OF ANNUAL
RYEGRASS & CEREAL
WINTER RYE 50-100
ANNUAL RYEGRASS 60-100
GERMAN MILLET 50
TEMPORARY SEEDING
SPECIFICATION
ID-000
N.T.S.
- Kentucky 31 Fescue 1081bs.
- Red Top Grass 2 lbs.
- Seasonal Nurse Crop * 20 lbs.
- Crownvetch ** 20 lbs.
150 lbs.
* Use seasonal nurse crop in accordance with seeding dates as stated below:
February 16th through April ...................... Annual Rye
May 1st through August 15th ..................... Foxtail Millet
August 16th through October ...................... Annual Rye
November through February 15th ................... Winter Rye
* * Substitute Sericea lespedeza for Crownvetch east of Farmville, Va. (May
through September use hulled Sericea, all other periods, use unhulled Sericea).
If Flatpea is used in lieu of Crownvetch, increase rate to 30 lbs./acre. All legume
seed must be properly inoculated. Weeping Lovegrass may be added to any slope
or low -maintenance mix during warmer seeding periods; add 10-20 lbs./acre in
mixes.
III - 303
PERMANENT SEEDING
SPECIFICATION
3.32
E-028
N.T.S.
ID-000
N.T.S.
Alan Franklin PE, LLC
Civil and Site Plan Engineering
427 Cranberry Lane Crozet, VA 22932
434-531-5544
alan@alanfranklinpe.com
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ISSUED: 08-06-2020
SCALE: 1" = 20'
REVISIONS:
1. 10-28-20 -COUNTY COMMENTS
SHEET
4
OF 5
D
.-. --F
L-3 OUT
/ Is,
IIJll.M
L-2 OUT
OC -
l Ii �
�' � 10B-2 ♦: Rio
AREA: V.12 AC e
�i
11 B-3
AREA: 0.41 AC
11 B-2
AREA: 1.86 AC
BIOFILTER L-3
s-, I
C�I
AREA. 6.88 AC
ri
RETENTION BASIN L-2
_ AC
Vol
� I1 Y _
. y
#*�bEVELOPMENT \
111110
SITE EX. 24" RCP v
OB STORM SYSTEM
OCKti TO SWI`� L 2
12 B-2
AREA: 0.63 AC
BIOFILTER S-3
23.93 0 126 S-3 OUT
6.96 _I R�
-go1 ofo
AC
10B 1
AREA: 23.81 AC
fbblAG6 NFLNYLIrYi
FT
BM K
HA
_
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DETAIL: L-2 DROP STRUCTURE TYP
1�1
--- -
'
FOREBAY WSE _
656.00 FT
STRUCTURE S4
CREST = 657.00 FT
STUCTURE S3
CREST = 658.00 FT
\ STRUCTURE SI
CREST = 660.00 FT
\6
\
\\ p \.
INSET (111 = 20')
1213-1 ��♦7,
V 4*1r on 1
AREA: 6.32 AC =
156
5.06
15B-1 =
AREA: 4.36AC
I
r
BIOFILTER S-12
S-12 OUT
c\ / . _
I II
1' I
ji
15B-3
AREA: 0.15 AC
S, NARRATIVE, AND TABLES FROM WP02016-00009 (PREP. BY STANTEK) APPROVED 7/20/16
PROPOSED CONDITIONS NARRATIVE
THE THREE EAST SIDE BIORETENTION FACILITY COMPLEXES, DESIGNED WITH BOTH WATER
QUALITY TREATMENT AND QUANTITY DETENTION COMPONENTS, ARE ENVISIONED TO SUPPORT
DEVELOPMENT OF BLOCKS 10, 16-18, AND 30. IN ADDITION, IMPROVEMENTS TO THE PREVIOUSLY
APPROVED RETENTION BASIN L-2 WILL PROVIDE BENEFITS TO EXISTING BLOCKS 1-3, 13, AND 14.
THE BIORETENTION FACILITIES ALSO INCORPORATE A STORMWATER DETENTION ELEMENT IN THE
FORM OF DETENTION BASINS TO PROVIDE SIGNIFICANT WATER QUANTITY CONTROL FOR THE
PROPOSED DEVELOPMENT PER THE APPROVED SWIM MASTER PLAN. THE FACILITIES ARE OUTSIDE
THE FEMA 100-YEAR FLOODPLAIN PER FEMA FLOOD INSURANCE RATE MAP FIRM PANEL
51003CO237D (FEBRUARY 4, 2005).
AESTHETIC CONSIDERATIONS ARE ALSO OF SIGNIFICANT CONCERN FOR THE FOUR FACILITIES
BECAUSE OF THEIR HIGHLY VISIBLE LOCATIONS. THE FACILITIES ARE DESIGNED TO BE
ATTRACTIVE FEATURES AND WILL INCORPORATE THE FUTURE GREENWAY TRAIL IN SEVERAL
INSTANCES. MAINTENANCE ACCESS TO THE BMPS IS ALSO PROVIDED.
EXISTING FACILITY L-2 HAS BEEN REDESIGNED TO PROVIDE ENHANCED WATER QUALITY
TREATMENT AND CONSIDER ADDITIONAL RUNOFF FROM PROPOSED DEVELOPMENTS OF THE EAST
SIDETOR ULTIMATE WATER QUAUTY BENEFIT. THE PLAN REQUIRES EMBANKMENT
RECONSTRUCTION AND A OUTLET STRUCTURE REPLACEMENT. ENHANCED PLANTINGS ARE ALSO
THE BIORETENTION FACILITY COMPLEX L-31S PROPOSED TO TREAT PORTIONS OF BLOCKS 10 AND
16 AND TO PROVIDE WATER QUANTITY AND QUALITY CONTROL FOR DRAINAGE AREA 11 B. THE
FACILITY WILL ALSO SERVE TO TRANSITION THE PROPOSED GREENWAY TRAIL FROM THE
DEVELOPMENT DOWN TO THE EXISTING STREAM BUFFER.
BIORETENTION FACILITY COMPLEX S31S PROPOSED TO TREAT AREAS OF BLOCKS 16, 17, AND 18
AND TO PROVIDE WATER QUANTITY AND QUALITY CONTROL FOR DRAINAGE AREA 12B. THE
FACILITY WILL PROVIDE FLOW FOR THE DESIGN STORMS PER THE MASTER PLAN. AESTHETICS ARE
A CONSIDERATION FOR THIS FACILITY, GIVEN ITS PROMINENT LOCATION BY THE ROADSIDE.
BIORETENTION FACILITY COMPLEX S-121S PROPOSED TO TREAT AREAS OF BLOCKS 17, 18, AND 30
CURRENTLY UNDER DESIGN DEVELOPMENT. IT WILL PROVIDE WATER QUANTITY AND QUALITY
CONTROL FOR DRAINAGE AREA 15B.
ALL BIORETENT10N FACILITIES HAVE BEEN DESIGNED WITH HIGH FLOW BYPASS CAPABILITY GIVEN
THE RELATIVE SIZE OF THE CONTRIBUTING DRAINAGE AREAS AND TO FURTHER AVOID HYDRAULIC
OVERLOADING.
STORMWATER MANAGEMENT DESIGN SUMMARY - EAST SIDE
Appendix C Hydrology Support Information
May 20, 2016
Post -development Drainage Areas:
IXYYfi0.ULlIfY; NEnenaTNYla
+xAwre TRwcx Mpa THE aoTrou or TUE sREeu aPn AND ro nE awiaul.
Anavuneameunowrwrr:e wseneerrarxe w;oorme.,,rvc. ne
Tnawsweoa:baA
MITpIE eu EuElea�omsnrrNE eao orE vuu Ew;uixoaFomre ro
DU RLYIEIRELau NTOTHEEKCSNNaco,nwoL xorF vN.F WNGL usr
9Elu P FER7ILDIMo,HEPAn[4.n:E... LL .E
GaA r..O. ADO(mtl�iV <FfserM 11 IK MME uPBTe�
HR µ.. o �.�� ��.L. owNITmE� P-r�.
8 EJ H`[. n! orir 11 P. eLL POCMI llN A®WUX Uv8r,8un
nm rowia 1A. wvarneurvwinemul. u;ocauPAcrmnuwwrrnw:s
s P.. n 5u w 'EV EN:a( PmFENacuua TO THE s IaMEnxK ExTM
AWwy E�W OERFLTCMND M CpErRUGi� su PER vy%Y:.¢ WE On' r"Me ,
6 BE4M TEC,V£Mr: 1. HH R ie H RTH,. mUN1Aw
, eaawre TTE,raTRwDLromELFap PEPTn
wNavnucTwRauDEulcs
,. uw.LVB o" CRINNfln .11 .,,ET NA1 Pa. NDTIs Por THE MAE OF THE
.ErpiE
1Roseemo`WC .E Wu......TR Hol
a res.Mr.TERsa. EI.1.. me Rum.
a VR,CIR!RNuoMeAU oWTH 9Loe FoW AND CiWiswr RED Mo pAr MR
s BFifE xu IFIYAGER. LNDER CP 4FOWo THE gRugh'is 6v RE .,
oRnaxc. erlr .umcou 1 PR ENDERANDnaaaomEmR,cnne
:.naE .1 PROPER r,.:cno,uaow v.Tx e. o.BmvlHR aow
avmres,nucTNE.
NDTe:
ReiNew.CRA91WCITFEIN4RGMLFAMFApNRITEgLIWBMar .
11EE AB vEUA ELmwNO M]wNenEWI FsA A,BT W!EoDER nm cURE(lNTH
aneiBNJ(CN TXFAtle CBYN YELWp W ETIREL.EWTve 0.AN NF1V I5
ANM Mimi. EH THIOtlA➢EEMIBIRLCRD. AELMGER VANE MNIS
swore snuATEn ox mE wr.R wE.
re wL as AND erz No mo,ER OR re AF H Roo- PER THIS
DETMLNRE( E.
STRUCTURE ELEVATIONS
MMM
eNATf
GitHri' ,
�Pw
a
CIFSrP91
plan Pe
RAN
6
pldP,1IT
r o '
e,all
11,a
STRUCTURE S5
CREST = 656.00 FT
sl I STRUCTURE S2
z I CREST =659.00 FT
I
Can) DOUBLE STEP
CREST = 659.00 FT
0) 1
I
670
{y 658
AREA: 0.1513-2
55 AC ��--
UPGRADES ON ALBEMARLE COUNTY PARKS
DEPARTMENT AND ADMINISTRATION PROPERTY,
INCLUDING EMBANKMENT ENCROACHMENT AND
CHANNEL IMPROVEMENTS AS NECESSARY SHALL
BE PERFORMED THROUGH AIGREEMENT
-1 FEET DEEP TRAPAZOIDAL �-
TRANSITION CHANNEL J
5 FEET BOTTOM WIDTH
2:1 SIDESLOPES
APPROXIMATE CHANNEL SLOPE _
1.1%
LINED WITH 2,2 FEET OF CLASS I
RIPRAP UNDERLAIN WITH
GEOTEXTILE FABRIC
y
MODIFY EXISTING
EMBANKMENT
RAISE CREST
ELEVATION TO =
664.40 FT
t 15 FEET WIDE TOP
WIDTH ,
B ----660
e6,.8=
e6B
-_657
INSTALL VDOT EW-1 - " - _ __fis+s; 854:=
652 -
650
SAFETY/AQUATIC 648
BENCH
i
WSE-655.50 FT
EP
U
i
Ea
A _TT.
STEP POOL STRUCTURE
(SEE INSET)
CHANNEL C-1-2-1
��/ OUTLET _
PROTECTION L-
2-1 �, 9
POSTDEVELOPMENT DRAINAGE AREAS (REVISED)
DA
LAND USE
HSG
AREA
CN
CN x A
10B_7
ASPHALT
g
3.805
98
373
TOWNHOMES
8
7.226
85
614
COMMERCIAL
g
9.085
92
836
OPEN SPACE
g
3.020
61
184
WATER
g
0.671
gg
66
SUM
23.81
2073
C N
87.07
lOB-2
IMPERVIOUS
g
0.000
98
1 0
OPEN SPACE
g
0.119
61
7
SUM
0.12
7
C N
61.00
'3 ? L
�J
10 FEET WIDE EMERGENCY SPILLWAY
CREST ELEVATION
THE663.25
10
NON -ACTIVATED IN THE 100-YEAR STORM
MATTED WITH LANDLOK 450 TRM
DAM HEIGHT APPROXIMATELY 25.4 FEET,
IMPOUNDMENT VOLUME -9.49 ACRE-FEET
DAM SAFETY REGULATIONS SHALL NOT
APPLY
\_
421NCH RCP
(
INV UP = 647.50 FT
INV DOWN = 639.00 FT -
REMOVE EXISTING RISER AND BARREL
(
INSTALL NEW SWM-1 RISER STRUCTURE
WITH 81NCH DRAIN VALVE AT ELEV EE 646.50 FT
j
CREST ELEVATION-661.25 FT
3-6 INCH CIRCULAR ORIFICES @ 655.50 FF
5.8 INCH CIRCULAR ORIFICES a 659.35 FT
J INSET I -"'`'` EXISTING 121NCH DIP WATERLINE TOP
OF PIPE ELEVATION 5.75 FIT
CCONTRACTOR SHALL OCATE VIA
D POTHOLING (25 FEET ON CENTER)
DURING CONSTRUCTION
A LI 41
41�a.
COORDINATION ONGOING REGARDING
USE OF PARKS PROPERTY
{ RESOLUTION TO BE PROVIDED
THROUGH EASEMENTS
LEGEND
_E" PROJECT OMITS
EXISTING CONTOURS
0-0 APPROXIMATE LOCATION OF
000 EXISTING STREAM BUFFER
PROPOSED GRADES
amPROPOSED BIORETENTION
FOOTPRINT
PROPOSED STORM SEWER
NETWORK
/ COUNTY CRITICAL SLOPES
(2007)
L-2 BIORETENTION SUMMARY:
PRE -DEVELOPMENT:
TOTAL DRAINAGE AREA = 14.19
APPROXIMATE IMPERVIOUS AREA = 0.21 ACRES
CURVE NUMBER = 61.54
POST -DEVELOPMENT:
TOTAL DRAINAGE AREA = 23.93 ACRES
APPROXIMATE IMPERVIOUS AREA = 16.22 ACRES
CURVE NUMBER = 86.94
RETENTION BASIN SIZING:
REQUIRED VOLUME = IMPERVIOUS AREA 0.5 IN / 12 IN/FT * 4
= 2.70 AC -FT (4*WQv WITH AQUATIC BENCH)
PROVIDED VOLUME = 2.73 AC -FT
WATER QUALITY TREATMENT:
POST -DEVELOPMENT POLLUTANT LOAD = 36.01 (LBS-TP/YR)
POLLUTANT REMOVAL EFFICIENCY = 65%
TOTAL ESTIMATED POLLUTANT REMOVAL = 23.41 (LBS-TP/YR)
HYDROLOGIC SUMMARY:
2-YEAR
10-YEAR
100-YEAR
CFS
CFS
CFS
PRE -DEVELOPMENT (UNROUTED)
6.04
18.69
48.54
CURRENT DEVELOPMENT (ROUTED)
5.49
9.27
44.64
POST -DEVELOPMENT (UNROUTED)
68.87
114.60
198.99
POST -DEVELOPMENT (ROUTED)
5.34
16.83
108.76
2-YEAR 10-YEAR 100-YEAR
FT FT FT
659.63 661.38 663.01
670 '
1
�_P'D REMOVE EXISTING
r 'L, INCH HDPE PIPE AND
-v"' INSTALL NEW MANHOLEti..r-��
UPSTREAM MANHOLE AND NEW 30 INCH RCP
INSTALL NEW MANHOLE
AND 42RCP WITH RRGA APPROVED
VELOPMENTPLAN
N ,// / / �� INV NOT EW-I DE
VDO =660.00FT
INSTALL PER
APPROVED RGA
DEVELOPMENT PLAN
-L 2 RETENTION BASIN DRAWING FROM WP02016-00009 APPROVED 7/20/1
PREPARED BY:
■ Stantec
uwc seee
VRlllaireb.,ry.VA2318B
PHONE:(N7)22061M0 FAX:TA7)M,4507
R FO
OLD TRAIL VILLAGE
CROZET, VA
TITLE'
6 L-2 RETENTION RASIN
GRADING AND LAYOUT
(APPROVED 7/20/16)
Water Quality Compliance Tracking Ledger
Date:
5/20/2016
Constructed /Planned
Facility ID
BMP Type (per VSWMH)
Master Plan Target
Drainage Area
Minimum Estimated
Required Drainage
Area
Design
Drainage Area
Drainage Area Above
Minimum
Compliance'"
Running Compliance
(Surplus)'•
WPO Plan Approval
Date
(acres)
(acres)
(acres)
(acres)
.-
(acres / )
Bioretent)on Facilities
L-3
eio Fifer (0.5 inch)
8.96
6.74
83
Current Submittal
S-3
&'OfTlier(O.Sinch)
6.89
5.18
Current Submittal
-0
S-)2
Bbflteriassach)
5,87
4.42
4r�
-
Current Submittal
S-5B
eioflter(0.5 inch)
3.52
2,65
-
-
41
=
C
S-5A
BioRller(0.5 inch)
4.87
3.66
-
-
S-6
Siofilter(0.5 inch)
1.40
1.05
a
S-6A
Biofilter 10.5 inch)
12,50
9,41
-
-
d
S-7
Notifies JO.5 inch)
6.66
5,01
-
-
S-]A
Biofilter (0.5 inch)
1.81
1.36
-
-
S-4
Biofilter 10.5 inch)
5.82
4.38
-
-
5-13
Bioflter(0.5 inch)
9.66
7.28
-
-
Sum
16798
1 51.15
1 17.56
1 1 22
'Ina victual BMPS may not meet this requirement as long as the sum of design drainage areas exceeds the sum of estmated minimum drainage areas.
"D,4 above Minimum compliance acreage remains available to offset future areas.
Facility ID
BMP Type (per VSWMH)
Required Minimum
Drainage Area '
Design Drainage Area
Exceedance of
Minimum
Drainage Area
Running Compliance
(Surplus/Deficit)
WPO Plan /Approval
Date
(acres)
(acres)
(acres)
(acres)
Pond Facilities
--1
Retention Basin 11 (4xwoV)'
42,54
42.54
20140004 i8-262014)
Lacted
OnS
SL2
ct. Basin III (4 W V) with Aquatic Bench`
15.30
15d0
201500066 -2CI5)
L-2
Rat Basin III (4xWOV) with Aquatic Bench
23.60
:+8
,�Lni Itr:1
Pionoed
-I
Retention Basin 11(4xWOVl
I114
Sum
9258
8L65
021
0.21
Design Submittal: East Side Design - Four Facilities
Sobmiffal Notes: In accordance with SWM Master Plan - Three Bloretenfion and One Retention Basin
Compliance as at 5/20/2016 Retention Basins: Yes Bloretotlont Yes
Total Site Compliance: Yes
Capture areas noted above pertain to water quality capture only. Additional benefit provided from further water quantity capture not Included.
Water Quantity Compliance Summary
NODE
Existing Peak Discharge
(cfs)
Proposed Peak Discharge
(Lis)
Percent Difference
10
2-YR 10-YR
1OD-YR
2-YR
10-YR
300 YR
2-YR
10-YR
100•YA
L-2
6.04 18.69
48.54
5.35
17.02
108.91
-11.4%
-8.9%
124.4%
L-3
4.71 ! 14.32
36.64
1.94
7.24
4S.47
-58.8%
-49.4%
24.1%
S-3
3.65 11.S2
30.66
3.60
1148
4141
-IA%
0.3%
3S.1%
S 12
1.17 3.63
9.48
0.81
2.26
22.61
-30.8%
-37.7%
138.5%
TOTAL ESTIMATED POLLUTANT REMOVAL we 23.41 (LBS-TP/YR)
HYDROLOGIC SUMMARY:
2-YEAR
10-YEAR
100-YEAR
CFS
CFS
CFS
PRE -DEVELOPMENT (UNROUTED)
6,04
18.69
48.54
CURRENT DEVELOPMENT (ROUTED)
5.49
9.27
44.64
POST-DEVELOPMENT(UNROUTED)
68.87
114.60
198.99
POST -DEVELOPMENT (ROUTED)
5.34
18.83
106.76
ROUTED PEAK ELEVATIONS: 2-YEAR 10 YEAR 100 YEAR
FT FT FT
POST -DEVELOPMENT 659.63 661.W 663.01
NOTE:
WATER QUALITY COMPLIANCE TRACKING LEDGER IS MAINTAINED BY ALBEMARLE COUNTY
ENGINEERING. THIS COMPLIANCE TRACKING MECHANISM WAS DEVELOPED IN TANDEM WITH THE
STORMWATER MASTER PLAN FOR OLD TRAIL VILLAGE DEVELOPMENT, DETAILS AVAILABLE AT
WP0201600009.
TABLES FROM WP02016-00009 (PREP. BY STANTEK
APPROVED 7/20/16
STORMWATER MANAGEMENT ASSESSMENT
STORMWATER MANAGEMENT FOR THIS PROJECT IS PROVIDED IN EXISTING SWM FACILITY LOCATED BEHIND THE
LODGE AT OLD TRAIL. THE BASIN WAS ORIGINALLY DESIGNED AS A BIO-FILTER DESIGNED TO HANDLE A TOTAL
DRAINAGE AREA OF 13.17 ACRES WITH 7.69 ACRES OF IMPERVIOUS AREA WITH WP02010-00036.
TWO SITE PLAN APPLICATIONS WERE APPROVED FOR DEVELOPMENT OF T.M.P. 55E01-F1 THAT WERE TIED TO THE
SWM FACILITY APPROVED IN WP02010-00036. SDP2009-00045 WAS THE SITE PLAN FOR THE LODGE AT OLD TRAIL,
WHICH INCLUDED THIS PARCEL WITH A SMALL OFFICE BUILDING AND A LARGE PARKING LOT AS PHASE II OF THE
PROJECT. THIS SITE PLAN INCLUDED DRAINAGE DESIGN AND ANALYSIS OF THE 24" STORMWATER PIPE SYSTEM TO
ADEQUATELY CONVEY RUNOFF FROM THE PHASE 1& 2 SITES TO SWM L-2. SDP2013-00011 WAS A SITE PLAN
AMENDMENT THAT CHANGED THE DEVELOPMENT OF PHASE II (THIS PARCEL) TO A HOTEL AND A SMALLER PARKING
LOT. THE SDP2013-00011 SITE PLAN AMENDMENT CITED A DECREASE IN PROPOSED IMPERVIOUS SURFACE AREA
FROM 28,182 SQUARE FEET TO 27,845 SQUARE FEET.
AFTER APPROVAL OF THE TWO SITE PLAN APPLICATIONS FOR THIS PARCEL, A SUBSEQUENT SWM MASTER PLAN
AMENDMENT, WP02016-00009, WAS PROCESSED AND APPROVED. THE BIO-FILTER WAS REVISED TO A RETENTION
BASIN III (4XWQV) WITH AQUATIC BENCH AND RENAMED SWM L-2. SWM L-2 WAS DESIGNED WITH THE CAPACITY TO
MANAGE STORMWATER FROM A TOTAL DRAINAGE AREA OF 23.93 ACRES CONTAINING 16.22 ACRES OF IMPERVIOUS
COVER.
THIS NEW WPO APPLICATION AND SWM ASSESSMENT IS IN ADVANCE OF A NEW SITE PLAN AMENDMENT THAT
PROPOSES A 10,500 SQUARE FOOT OFFICE BUILDING AND ASSOCIATED PARKING LOT AND A FURTHER REDUCTION
OF PROPOSED IMPERVIOUS AREA TO A TOTAL OF 27,000 SQUARE FEET.
IT IS NOT CLEAR IN THE WP02016-00009 SWM MASTER PLAN DOCUMENTS WHICH OF THE SPD SITE PLAN
APPLICATIONS WAS INCLUDED IN THE DESIGN OF SWM L-2, BUT THE SITE PLAN AMENDMENT DEPICTED IN THIS WPO
APPLICATION PROPOSES LESS IMPERVIOUS AREA THAN EITHER OF THE PREVIOUS SITE PLAN APPROVALS WITH NO
INCREASE IN DRAINAGE AREA TO SWM L-2. THE EXISTING STORM PIPE SYSTEM FROM THIS SITE TO SWM L-2 IS 24"
RCP. IT WAS DESIGNED AND INSTALLED AS PART OF THE SDP2009-00045, LODGE AT OLD TRAIL SITE PLAN. I HAVE
REVIEWED THE INLET AREA MAPS, RUNOFF CALCULATIONS, AND PIPE CAPACITY DESIGN TABLES FROM THAT PLAN
AND DETERMINED THAT THIS 24" PIPE SYSTEM IS MORE THAN ADEQUATE.
IT IS MY ASSESSMENT THAT STORMWATER MANAGEMENT REQUIREMENTS FOR THIS PROPOSED SITE PLAN ARE
ADEQUATELY ADDRESSED BY SWM L-2 AND THAT THE EXISTING STORM PIPE SYSTEM FROM THE DEVELOPMENT
SITE TO SWM L-2 IS ADEQUATE AS DESIGNED.
Alan Franklin PE, LLC
Civil and Site Plan Engineering
427 Cranberry Lane Crozet, VA 22932
434-531-5544
alan@alanfranklinpe.com
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Alan G. Franklin
Lic. No. 35326 w
O u,
T
ISSUED: 08-06-2020
SCALE: AS SHOWN
REVISIONS:
1. 10-28-20 - COUNTY COMMENTS
SHEET
OF 5