HomeMy WebLinkAboutWPO201900033 Plan - Revision Major Amendment, Final Site Plan 2019-11-18►:
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C-6.1
VSMP COVER SHEET
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EROSION & SEDIMENT
CONTROL NARRATIVE
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EROSION & SEDIMENT
CONTROL PLAN
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EROSION & SEDIMENT
CONTROL DETAILS
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BMP ANALYSIS AREA MAP & SWM CALCULATIONS
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APPENDIX
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SOURCE OF TITLE:
THIS IS A PORTION OF THE SAME PROPERTY IDENTIFIED AS TAX MAP PARCEL 6,IW-3-19A (PARCEL 1)
CONVEYED PROPERTY O(PREVIOUS OWNED BY r PLACE r
COUNTY OF ALBEMARLE, LLC) BY THAT CERTAIN DEED DULY RECORDED IN THE CLERK'S OFFICE OF THE CIRCUIT COURT OF -THE
NOTES:
1. THE PURPOSE OF THESE PLANS IS TO SHOW THE SITE IMPROVEMENT MODIFICATIONS REQUIRED FOR
COMMERCIAL BUILDING G5 FOR THE STONEFIELD DEVELOPMENT ON BLOCK G.
2. VISIBILITY OF ALL MECHANICAL EQUIPMENT FROM THE ENTRANCE CORRIDOR SHALL BE ELIMINATED.
3. EACH OUTDOOR LUMINAIRE EQUIPPED WITH A LAMP THAT EMITS 3,000 OR MORE INITIAL LUMENS SHALL
BE A FULL CUTOFF LUMINAIRE AND SHALL BE ARRANGED OR SHIELDED TO REFLECT LIGHT AWAY FROM
ADJOINING RESIDENTIAL DISTRICTS AND AWAY FROM ADJACENT ROADS. THE SPILLOVER OF LIGHTING FROM
LUMINAIRES ONTO PUBLIC ROADS AND PROPERTY IN RESIDENTIAL OR RURAL AREAS ZONING DISTRICTS
SHALL NOT EXCEED ONE HALF FOOTCANDLE.
MAJOR SITE PLAN AMENDMENT NOTES:
1. REFER TO "STONEFIELD BLOCK G FINAL SITE PLAN AND VSMP PLAN" SDP 2014-00065 AND WPO
2014-00102 FOR ADDITIONAL INFORMATION INCLUDING BUT NOT LIMITED TO GENERAL NOTES AND
DETAILS, STORM DRAINAGE AREA MAPS AND CALCULATIONS, EROSION AND SEDIMENT CONTROL, AND
LANDSCAPING DETAILS AND CALCULATIONS.
2. STORMWATER MANAGEMENT FOR THE LAND MASS ENCOMPASSED WITH THIS PLAN ARE PROVIDED WITH
THE WPO 2014---00102, WPO 2010-00023, WPO 2013-69 AND SDP 2014-00065. THIS PLAN IS IN
CONFORMANCE WITH THOSE REQUIREMENTS FOR QUANTITY AND QUALITY CONTROLS AS WELL AS MS-19.
3. PARKING COUNTS HAVE BEEN UPDATED TO REFLECT THESE IMPROVEMENTS.
4. PARKING LOT LIGHTING HAS NOT CHANGED.
5. ADDITIONAL PARKING FOR THE BANK IS PROVIDED WITHIN THE BLOCK G PARKING LOT.
6. THIS SITE IS SUBJECT TO PROFFERS PER ZMA 2001--0007.
7. THIS SITE IS SUBJECT TO WAIVERS/MODIFICATIONS PER SDP 2014--0065.
8. PUBLIC WATER & SEWER IS PROVIDED TO THIS SITE THROUGH THE ALBEMARLE COUNTY SERVICE
AUTHORITY (ACSA).
9. DRIVE-THRU USE PERMITTED THROUGH SPECIAL EXCEPTION REQUEST, APPROVED BY THE BOARD OF
SUPERVISORS ON JULY 17, 2019
1 ADDRESSED COUNTY COMMENTS jJD8 1 7/31/19
2 ADDRESSED COUNTY COMMENTS jJDI3 1 8/28/19
NO.
SHEET REVISION
BY I DATE I NO,
SHEET REVISION
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BY ( DATE
AMENDMENT TO
WPO 2014-00102
VICINITY MAP
SCALE: 1 "=2000'
�''1~kI 0 z
LTc. No. 67 ,
APPROVED
by the Albemarle County
Community Development Department
Date_L/ - / 9- J y
File
2.rLL
OCT STONEFIELD PROPERTY OWNER LLC
C/O O'CONNOR CAPITAL PARTNERS LLC
535 MADISON AVENUE, 6TH FLOOR
NEW YORK, NY 10022
ATTN: OJAS DESAI
EMAIL: ODESAIOOCONNORCP.COM
WW ASSOCIATES, INC
3040 AVEMORE SQUARE PLACE
CHARLOTTESVILLE, VA 22911
(434) 984-2700
ATTN: HERBERT F. WHITE III, P.E.
EMAIL: HWHITEWWASSOCIATES.NET
SOURCE OF TITLE.
THE PROPERTY AS SHOWN ON THIS PLAN IS THE PROPERTY CONVEYED UNTO OCT STONEFIELD PROPERTY OWNER, LLC BY
THAT CERTAIN DEED DULY ON RECORD IN THE CLERK'S OFFICE OF THE CIRCUIT COURT OF THE COUNTY OF ALBEMARLE,
VIRGINIA IN DB 4857, PGS 503-51 1 AND IS INDICATED AS TAX MAP PARCEL TMP 61 W-3-19A.
COUNTY, STATE:
WATER PROTECTION AREA:
TAX MAP/PARCEL:
OVERLAY DISTRICT:
' 11M
MAXIMUM NUMBER OF EMPLOYEES:
PROPOSED BUILDING HEIGHT (G5):
LAND USE SCHEDULE:
WW ASSOCIATES, INC
DATED: MAY 29, 2013
WW ASSOCIATES, INC
BY FIELD SURVEY
PERFORMED ON: APRIL 08, 2019
ALBEMARLE COUNTY, VA
i
N/A (NON -WATER SUPPLY WATERSHED)
TM 61W, PARCEL 3--19A
1
a
ON -SITE DUMPSTER (EXISTING)
4
THERE ARE NO MINIMUM OR MAXIMUM LOT WIDTHS OR
DEPTH REQUIREMENTS.
26' MAX.
TOTAL PARCEL
TOTAL BLOCK G
BUILDINGS (FOOTPRINT)
ROADS/PARKING
GREEN SPACE
CIVIC SPACE
IMPERVIOUS AREA
PROPOSED
918,093
SQ
FT
(21.08 AC.)
210,807
SQ
FT
(4.84
AC.)
100%
38,090
SQ
FT
(0.87
AC.)
18.1
94,720
SQ
FT
(2.17
AC.)
45.0%
62,760
5Q
FT
(1.44
AC.)
29.8%
15,237
SQ
FT
(0.35
AC,)
7.2%
148,047
SQ
FT
(3.40
AC,)
70.2%
2) CIVIC SPACE AND GREEN SPACE AREAS MAY OVERLAP AND ARE INDEPENDENT ENTITIES.
3) CIVIC SPACE AND ROADS/PARKING AREAS BOTH INCLUDE CROSSWALK AREAS.
4) GREEN SPACE AND ROADS/PARKING AREAS BOTH
INCLUDE PARKING ISLANDS.
5) .BECAUSE OF THE OVERLAP IN AREAS, MENTIONED
ABOVE, `THE TOTAL AREA IS NOT A SUM OF THE INDIVIDUAL AREAS.
6) THE GREEN SPACE AND CIVIC SPACE AREAS DO NOT INCLUDE THE EXISTING TREE LAWN AND SIDEWALK ON THE
NORTHERN SIDE OF BLACKBIRD LANE SINCE THEY
WERE CONSTRUCTED WITH THE STONEFIELD TOWN CENTER.
REQUIRED PARKING: 172 SPACES
(38,090 GLA/1,000=38.09, 38.09*4.5=171.41)
PROVIDED PARKING: 216 EXISTING
+ 8 PROVIDED = 224 (INCLUDES 9 HANDICAPPED SPACES)
DESIGNED BY:
JDB
PROJECT:
STONEFIELDTER
SET REV. NO.
ENGINEERS DRAIINN BY:
F BANK, BLOCK
SURVEYORS HMSIDSB
ALBEMARLE O , VIRGINIA
DRAWING NUMBER:
PLANNERS -
TITLE:
DIHR BY:
AsSOCIATES HFW--
COVER SHE
-. 1
PO Box 4119 3040 Aveniore Sq Place
Lynchburg, VA 24502 Charlottesville, VA 22911 WWA NUMBER:
SHEET NUMBER:
FILE NAME:
DISCIPLINE:
SCALE:
DATE:
Phone: 434.316.6080 Phone: 434.9943700 g y /
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I. PROJECT DESCRIPTION
THE PURPOSE OF THIS PROJECT IS FOR THE CONSTRUCTION OF BUILDING G-5 AND IT'S ASSOCIATED PARKING. THIS
PROJECT WILL INVOLVE DISTURBING APPROXIMATELY 0.45 ACRES.
II. EXISTING SITE CONDITIONS
THE SITE HAS BEEN GRADED PER THE "STONEFIELD BLOCK G FINAL SITE PLAN & VSMP PLAN", SDP-2014-00065
AND THE EXISTING CONTOURS ON THIS PLAN REPRESENT THE AS ---BUILT CONDITIONS FROM THE CONSTRUCTION OF
THESE PLANS.
III. ADJACENT PROPERTIES
THE SITE IS BOUNDED TO THE WEST BY THE COSTCO SITE, TO THE NORTH BY BUILDING G-4, TO THE EAST BY RT.
29, AND TO THE SOUTH BY SPERRY MARINE/NORTHROP GRUMMAN.
IV. OFF --SITE AREAS
THERE WILL BE NO IMPORT OR EXPORT OF SOIL MATERIALS.
SOILS
ACCORDING TO USDA NRCS SOIL MAPPING, THE PROJECT SITE LIES ON SOIL TYPES: ELIOAK LOAM (27B),
ELIOAK LOAM (27C), GLENELG LOAM (34D), AND URBAN LAND (91). A DESCRIPTION OF THE SOIL TYPES
FOLLOWS:
ELIOAK
2 TO 7 PERCENT SLOPES
dYDROLOGIC SOILOR
FACTOR, WHOLE SOI,
ELIOAKa
7 TO 15 PERCENT SLOPES
HYDROLOGIC SOIL GROUP B
K FACTOR, WHOLE SOIL RATING .28
34D - GLENELG LOAM,
15 TO 25 PERCENT SLOPES
HYDROLOGIC SOIL GROUP B
K FACTOR, WHOLE SOIL RATING .24
VI. CRITICAL AREAS
CARE SHALL BE TAKEN TO STABILIZE ALL SLOPES AND PREVENT EROSION, TO MINIMIZE THE TRANSPORT OF SEDIMENT
ONTO INTERNAL ROADWAYS, PARKING AREAS, AND RT. 29.
VII. STORMWATER MANAGEMENT CONSIDERATIONS
MEASURES NECESSARY TO ACHIEVE POLLUTANT REMOVAL REQUIREMENTS FOR THE PROPOSED IMPROVEMENTS ARE
SHOWN AS PART OF THIS PLAN.
VIII. OFF --SITE ACTIVITIES
THERE WILL BE NO OFF --SITE ACTIVITIES.
IX. EROSION AND SEDIMENT CONTROL MEASURES
ALL VEGETATIVE AND STRUCTURAL EROSION AND SEDIMENT CONTROL PRACTICES SHALL BE CONSTRUCTED AND
MAINTAINED BY THE CONTRACTOR IN ACCORDANCE WITH THE LATEST EDITION OF THE VIRGINIA EROSION AND SEDIMENT
CONTROL HANDBOOK. SYMBOLS, DETAILS, AND DIMENSIONS USED ARE TAKEN FROM THE HANDBOOK, AS WELL AS THE
VIRGINIA DEPARTMENT OF TRANSPORTATION'S ROAD AND BRIDGE STANDARDS, VOLUME [, 2008.
A. STRUCTURALPRACTICES
1. TEMPORARY CONSTRUCTION ENTRANCE (CE), 3.02: TEMPORARY CONSTRUCTION ENTRANCES SHALL BE IN
ACCORDANCE WITH ALBEMARLE COUNTY REQUIREMENTS. A MINIMUM WATER TAP OF 1" MUST BE INSTALLED WITH A
MINIMUM 1" BALLCOCK SHUTOFF VALVE SUPPLYING A WASH HOSE WITH A DIAMETER OF 1.5" FOR ADEQUATE
CONSTANT PRESSURE OR IN LIEU OF A WATER TAP, EACH CONSTRUCTION ENTRANCE SHALL HAVE A WATER TRUCK
WITH 2 PRESSURE WASHERS AT ALL TIMES. WASH WATER MUST BE CARRIED AWAY FROM THE ENTRANCE TO AN
APPROVED SETTLING AREA TO REMOVE SEDIMENT. ALL SEDIMENT SHALL BE PREVENTED FROM ENTERING STORM
DRAINS, DITCHES OR WATERCOURSES.
2. SILT FENCE (SF), 3.05: SILT FENCE BARRIERS SHALL BE INSTALLED DOWN SLOPE OF AREAS WITH MINIMAL GRADES
TO FILTER RUNOFF FROM SHEET FLOW AS INDICATED ON THE SITE PLAN.
3. SOIL STABILIZATION BLANKETS & MATTING (B/M), 3.36: INSTALL AS SHOWN ON PLAN TO RESIST EROSION AND
PROMOTE THE ESTABLISHMENT OF YOUNG VEGETATION IN CHANNELIZED AREAS.
4. DUST CONTROL (DC), 3.39: PROVIDE DUST CONTROL AS NECESSARY TO HELP REDUCE THE PRESENCE OF
AIRBORNE SUBSTANCES DURING LAND DISTURBING ACTIVITIES.
Il` of
SHEET REVISION I BY I DATE I NO.
1. TOP SOILING & STOCKPILING (TO), 3.30: TOPSOIL WILL BE STRIPPED FROM AREAS TO BE GRADED AND STOCKPILED
FOR LATER USE. STOCKPILES ARE TO BE STABILIZED WITH TEMPORARY VEGETATION AND HAVE SILT FENCE INSTALLED
ALONG THE LOWER PERIMETER. STOCKPILES SHALL BE LOCATED AS SHOWN ON THE PLANS.
2. REFER TO "ALBEMARLE COUNTY GENERAL CONSTRUCTION NOTES FOR EROSION AND SEDIMENT CONTROL PLANS"
17 AND #18 AND TO TABLE 3.32®D AND TABLE 3.31 -B ON DWG C-9 FOR ADDITIONAL INFORMATION.
C. MINIMUM STANDARDS
MS-1. STABILIZATION OF DENUDED AREAS:
PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN 7 DAYS AFTER FINAL
GRADE IS REACHED ON ANY PORTION OF THE SITE. TEMPORARY SOIL STABILIZATION SHALL BE APPLIED WITHIN 7 DAYS
TO DENUDED AREAS THAT MAY NOT BE AT FINAL GRADE, BUT WILL REMAIN DORMANT OR UNDISTURBED FOR LONGER
THAN 30 DAYS. PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR MORE
THAN ONE YEAR.
MS-2. STABILIZATION OF SOIL STOCKPILES:
DURING CONSTRUCTION OF THE PROJECT, SOIL STOCKPILES AND BORROW AREAS SHALL BE STABILIZED OR PROTECTED
WITH SEDIMENT TRAPPING MEASURES. THE APPLICANT IS RESPONSIBLE FOR TEMPORARY PROTECTION AND PERMANENT
STABILIZATION OF ALL STOCKPILES ON SITE AS WELL AS BORROW AREAS AND SOIL INTENTIONALLY TRANSPORTED FROM
THE PROJECT SITE.
MS-3. PERMANENT VEGETATIVE COVER:
A PERMANENT VEGETATIVE COVER SHALL BE ESTABLISHED ON DENUDED AREAS NOT OTHERWISE PERMANENTLY
STABILIZED. PERMANENT VEGETATION SHALL NOT BE CONSIDERED ESTABLISHED UNTIL A GROUND COVER IS ACHIEVED
THAT, IN THE OPINION OF THE E&S INSPECTOR, IS UNIFORM AND MATURE ENOUGH TO SURVIVE AND INHIBIT EROSION.
MS-4. TIMING AND STABILIZATION OF SILT TRAPPING MEASURES:
SEDIMENT BASINS AND TRAPS, STORM INLET PROTECTION, SILT FENCING, AND OTHER MEASURES INTENDED TO TRAP
SEDIMENT SHALL BE CONSTRUCTED AS A FIRST STEP IN ANY LAND DISTURBING ACTIVITY AND SHALL BE MADE
FUNCTIONAL BEFORE UPSLOPE LAND DISTURBANCE TAKES PLACE.
MS-5. STABILIZATION OF EARTHEN STRUCTURES:
STABILIZATION MEASURES SHALL BE APPLIED TO EARTHEN STRUCTURES SUCH AS DAMS, DIKES AND DIVERSIONS
IMMEDIATELY AFTER INSTAI-LATION.
MS-6. SEDIMENT BASINS AND TRAPS:
SEDIMENT TRAPS & BASINS SHALL BE CONSTRUCTED BASED UPON THE TOTAL DRAINAGE AREA TO BE SERVED.
A. THE MINIMUM CAPACITY OF A SEDIMENT TRAP SHALL BE 134-CUBIC YARDS PER ACRE OF DRAINAGE AREA, AND
SHALL CONTROL A DRAINAGE AREA OF LESS THAN 3--ACRES.
B. THE MINIMUM CAPACITY OF A SEDIMENT BASIN SHALL BE 134-wCUBIC YARDS PER ACRE OF DRAINAGE AREA, AND
SHALL CONTROL A DRAINAGE AREA OF 3-ACRES OR GREATER.
MS-7. CUT AND FILL SLOPES:
CUT AND FILL SLOPES SHALL BE CONSTRUCTED IN A MANNER THAT WILL MINIMIZE EROSION. SLOPES THAT ARE FOUND
TO BE ERODING EXCESSIVELY WITHIN ONE YEAR OF PERMANENT STABILIZATION SHALL BE PROVIDED WITH ADDITIONAL
SLOPE STABILIZING MEASURES UNTIL THE PROBLEM IS CORRECTED.
MS-8. CONCENTRATED RUNOFF DOWN CUT OR FILL SLOPES:
CONCENTRATED RUNOFF SHALL NOT FLOW DOWN CUT OR FILL SLOPES UNLESS CONTAINED WITHIN AN ADEQUATE
TEMPORARY OR PERMANENT CHANNEL, FLUME OR SLOPE DRAIN STRUCTURE.
MS-9. WATER SEEPAGE FROM A SLOPE FACE:
WHENEVER WATER SEEPS FROM A SLOPE FACE, ADEQUATE DRAINAGE OR OTHER PROTECTION SHALL BE PROVIDED.
MS-10. STORM SEWER INLET PROTECTION:
ALL STORM SEWER INLETS THAT ARE MADE OPERABLE DURING CONSTRUCTION SHALL BE PROTECTED SO THAT
SEDIMENT --LADEN WATER CANNOT ENTER THE CONVEYANCE SYSTEM WITHOUT FIRST BEING FILTERED OR OTHERWISE
TREATED TO REMOVE SEDIMENT.
MS-11. STABILIZATION OF OUTLETS:
BEFORE NEWLY CONSTRMTED STORM WATER CONVEYANCE CHANNELS OR PIPES ARE MADE OPERATIONAL, ADEQUATE
OUTLET PROTECTION AND ANY REQUIRED TEMPORARY OR PERMANENT CHANNEL LINING SHALL BE INSTALLED IN BOTH
THE CONVEYANCE CHANNEL AND RECEIVING CHANNEL.
MS®12. WORK IN LIVE WATERCOURSES:
WHEN WORK IN A LIVE WATERCOURSE IS PERFORMED, PRECAUTIONS SHALL BE TAKEN TO MINIMIZE ENCROACHMENT,
CONTROL SEDIMENT TRANSPORT AND STABILIZE THE WORK AREA TO THE GREATEST EXTENT POSSIBLE DURING
CONSTRUCTION. NONERODIBLE MATERIAL SHALL BE USED FOR THE CONSTRUCTION OF CAUSEWAYS AND COFFERDAMS.
EARTHEN FILL MAY BE USED FOR THESE STRUCTURES IF ARMORED BY NONERODIBLE COVER MATERIALS.
MS-13. CROSSING A LIVE WATERCOURSE:
WHEN A LIVE WATERCOURSE MUST BE CROSSED BY CONSTRUCTION VEHICLES MORE THAN TWICE IN ANY SIX MONTH
PERIOD, A TEMPORARY VEHICULAR STREAM CROSSING CONSTRUCTED OF NONERODIBLE MATERIALS SHALL BE PROVIDED.
MS-14. APPLICABLE REGULATIONS:
ALL APPLICABLE FEDERAL, STATE AND LOCAL REGULATIONS PERTAINING TO WORKING IN OR CROSSING LIVE
WATERCOURSES SHALL BE MET,
MS-15. STABILIZATION OF BED AND BANKS: N/A
THE BED AND BANKS OF A WATERCOURSE SHALL BE STABILIZED IMMEDIATELY AFTER WORK IN THE WATERCOURSE IS
COMPLETED.
SHEET REVISION
BY I DATE
� LTc. No. 7 A;
MS-16. UNDERGROUND UTILITIES:
UNDERGROUND UTILITY LINES SHALL BE INSTALLED IN ACCORDANCE WITH THE. FOLLOWING STANDARDS, IN ADDITION TO
OTHER APPLICABLE CRITERIA:
A. NO MORE THAN 500-LINEAR FELT OF TRENCH MAY BE OPENED AT ONE TIME.
B. WHERE CONSISTENT WITH SAFETY AND SPACE CONSIDERATIONS, EXCAVATED MATERIAL IS TO BE PLACED ON THE:
UPHILL SIDE OF TRENCHES, EXCEPT FOR ANY DIVERSION DITCHES.
C. EFFLUENT FROM DEWATERING OPERATIONS SHALL BE FILTERED OR PASSED THROUGH AN APPROVED SEDIMENT
TRAPPING DEVICE, OR BOTH, AND DISCHARGED IN A MANNER THAT DOES NOT ADVERSELY AFFECT FLOWING STREAMS
OR OFFSITE PROPERTY.
D. TRENCH BACKFILL MATERIAL SHALL BE PROPERLY COMPACTED IN ORDER TO MINIMIZE EROSION AND PROMOTE
STABILIZATION.
E. RESTABILIZATION SHALL BE ACCOMPLISHED IN ACCORDANCE WITH 'THESE REGULATIONS.
F. ALL APPLICABLE SAFETY REGULATIONS SHALL BE COMPLIED WITH AT ALL TIMES.
MS-17. CONSTRUCTION ACCESS ROUTES:
WHERE CONSTRUCTION VEHICLE ACCESS ROUTES INTERSECT PAVED OR PUBLIC ROADS, PROVISIONS SHALL BE MADE TO
MINIMIZE THE TRANSPORT OF SEDIMENT BY VEHICULAR TRACKING ONTO THE PAVED SURFACE. WHERE SEDIMENT IS
TRANSPORTED ONTO A PAVED OR PUBLIC ROAD, THE ROAD SURFACE SHALL BE CLEANED THOROUGHLY AT THE END OF
EACH DAY. SEDIMENT SHALL BE REMOVED BY SHOVELING OR SWEEPING AND TRANSPORTED TO A SEDIMENT DISPOSAL
AREA. STREET WASHING SHALL BE ALLOWED ONLY AFTER SEDIMENT IS REMOVED IN THIS MANNER. THIS PROVISION
SHALL APPLY TO INDIVIDUAL DEVELOPMENT LOTS AS WELL AS TO URGER LAND -DISTURBING ACTIVITIES.
MS-1 B. TEMPORARY E&S CONTROL MEASURE REMOVAL:
ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES SHALL BE REMOVED WITHIN 30 DAYS AFTER FINAL SITE
STABILIZATION OR AFTER TEMPORARY MEASURES ARE NO LONGER NEEDED, UNLESS OTHERWISE AUTHORIZED BY THE:
LOCAL E&S AUTHORITY. TRAPPED SEDIMENT AND THE DISTURBED SOIL AREAS RESULTING FROM THE DISPOSITION OF
TEMPORARY MEASURES SHALL BE PERMANENTLY STABILIZED TO PREVENT FURTHER EROSION AND SEDIMENTATION.
MS-19. ADEQUACY OF RECEIVING CHANNELS:
PROPERTIES AND WATERWAYS DOWNSTREAM FROM THE DEVELOPMENT SITE SHALL BE PROTECTED FROM SEDIMENT
DEPOSITION, EROSION AND DAMAGE DUE TO INCREASES IN VOLUME, VELOCITY AND PEAK FLOW RATES OF STORM WATER
RUNOFF FOR THE STATED FREQUENCY STORM OF 2.4---HOUR DURATION.
D. MAINTENANCE:
ALL EROSION AND SEDIMENT CONTROL STRUCTURES AND SYSTEMS SHALL BF MAINTAINED, INSPECTED, AND REPAIRED
AS NEEDED TO INSURE CONTINUED PERFORMANCE OF THEIR INTENDED FUNCTION. ALL EROSION AND SEDIMENT
CONTROL MEASURES SHALL BE CHECKED AT THE END OF EACH DAY AND AFTER EVERY RAINFALL EVENT.
1. DAMAGE TO EROSION CONTROL MEASURES CAUSED BY CONSTRUCTION TRAFFIC OR OTHER ACTIVITY SHALL BE
REPAIRED BEFORE THE END OF EACH WORKING DAY.
2. MAINTAIN ALL SEEDED AREAS UNTIL A UNIFORM STAND IS ACCEPTED.
. CONSTRUCTION ENTRANCE (3.02): PROVIDE FOR EQUIPMENT WASHING AS NEEDED TO PREVENT THE TRANSPORT OF
SOIL ONTO EXISTING ASPHALT ROADWAYS. ANY SEDIMENT ON THE PAVEMENT SHALL BE REMOVED IMMEDIATELY.
4. SILT FENCE (3.05): SILT FENCE BARRIERS WILL BE CHECKED DAILY FOR UNDERMINING OR DETERIORATION OF THE
FABRIC. SEDIMENT SHALL BE REMOVED WHEN THE LEVEL REACHES HALF WAY TO THE TOP OF THE BARRIER.
5. SEEDING (3.31 / 3.32): AREAS WHICH FAIL TO ESTABLISH VEGETATIVE COVER ADEQUATE TO PREVENT RILL EROSION
WILL BE RESEEDED AS SOON AS SUCH AREAS ARE IDENTIFIED.
6. SOIL STABILIZATION BLANKETS & MATTING (3.36): THE MEASURE SHALL BE PERIODICALLY CHECKED FOR
UNDERMINING AND TO ENSURE THAT IT IS SECURE AND FUNCTIONING AS INTENDED.
7. DUST CONTROL (3.39): PROVIDE DUST CONTROL IN AREAS SUBJECT TO SURFACE AND AIR MOVEMENT OF DUST
WHERE ON -SITE AND OFF ---SITE DAMAGE IS LIKELY TO OCCUR IF PREVENTIVE MEASURES ARE NOT TAKEN.
LEA ENE CON UTI.,yNOTES � I4�_A�D.Q 0
1. THE PLAN APPROVING AUTHORITY MUST BE NOTIFIED ONE WEEK PRIOR 'TO THE PRE -CONSTRUCTION CONFERENCE,
ONE WEEK PRIOR TO THE COMMENCEMENT OF LAND DISTURBING ACTIVITY, AND ONE WEEK PRIOR TO THE FINAL
INSPECTION,
2. ALL EROSION AND SEDIMENT CONTROL MEASURES WILL BE CONSTRUCTED AND MAINTAINED ACCORDING TO MINIMUM
STANDARDS AND SPECIFICATION OF THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK AND VIRGINIA
REGULATIONS VR 625-02-00 EROSION AND CONTROL SEDIMENT REGULATIONS.
3. ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR TO OR AS THE FIRST STEP IN
CLEARING.
4. A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL PLAN SHALL BE MAINTAINED ON THE SITE AT ALL
TIMES.
5. PRIOR TO COMMENCING LAND DISTURBING ACTIVITIES IN AREAS OTHER THAN INDICATED ON THESE PLANS
(INCLUDING, BUT NOT LIMITED TO, OFF -SITE BORROW OR WASTE AREAS), THE CONTRACTOR SHALL SUBMIT A
SUPPLEMENTARY EROSION CONTROL PLAN TO THE OWNER FOR REVIEW AND APPROVAL BY THE PLAN APPROVING
AUTHORITY.
6. THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY ADDITIONAL EROSION CONTROL MEASURES
NECESSARY TO PREVENT EROSION AND SEDIMENTATION AS DETERMINED BY THE PLAN APPROVING AUTHORITY.
7. ALL DISTURBED AREAS ARE TO DRAIN TO APPROVED SEDIMENT CONTROL MEASURES AT ALL TIMES DURING
LAND DISTURBING ACTIVITIES AND DURING SITE DEVELOPMENT UNTIL FINAL STABILIZATION IS ACHIEVED.
6. DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN APPROVED FILTERING DEVICE.
9. THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES PERIODICALLY AND AFTER EACH
RUNOFF --PRODUCING RAINFALL EVENT. ANY NECESSARY REPAIRS FOR CLEANUP TO MAINTAIN THE
EFFECTIVENESS OF THE EROSION CONTROL DEVICES SHALL BE MADE IMMEDIATELY.
10. ALL FILL MATERIAL TO BE TAKEN FROM AN APPROVED, DESIGNATED BORROW AREA.
11. ALL WASTE MATERIALS SHALL BE -TAKEN TO AN APPROVED WASTE AREA. EARTH FILL SHALL BE INERT
MATERIALS ONLY, FREE OF ROOTS, STUMPS, WOOD, RUBBISH, AND OTHER DEBRIS.
12. BORROW OR WASTE AREAS ARE TO BE RECLAIMED WITHIN 7 DAYS OF COMPLETION PER ZONING
ORDINANCE SECTION 5.1.28.
13. ALL INERT MATERIALS SHALL BE TRANSPORTED TO COMPLIANCE WITH SECTION 13-301 OR THE CODE OF
ALBEMARLE.
14. BORROW, FILL OR WASTE ACTIVITY INVOLVING INDUSTRIAL --TYPE POWER EQUIPMENT SHALL BE LIMITED TO
THE HOURS OF 7:OOA.M. TO 9:00 P.M.
15. BORROW, FILL OR WASTE ACTIVITY SHALL BE CONDUCTED IN A SAFE MANNER THAT MAINTAINS LATERAL
SUPPORT, IN ORDER TO MINIMIZE ANY HAZARD TO PERSONS, PHYSICAL DAMAGE TO ADJACENT LAND AND
IMPROVEMENTS, AND DAMAGE TO ANY PUBLIC STREET BECAUSE OF SLIDES, SINKING, OR COLLAPSE.
16, THE DEVELOPER SHALL RESERVE THE RIGHT TO INSTALL, MAINTAIN, REMOVE OR CONVERT TO PERMANENT
STORMWATER MANAGEMENT FACILITIES WHERE APPLICABLE ALL EROSION CONTROL MEASURES REQUIRED BY
THIS PLAN REGARDLESS OF THE SALE OF ANY LOT, UNIT, BUILDING OR OTHER PORTION OF THE
PROPERTY.
17. TEMPORARY STABILIZATION SHALL BE TEMPORARY SEEDING AND MULCHING. SEEDING IS TO BE AT 75
LBS/ACRE, AND IN THE MONTHS OF SEPTEMBER TO FEBRUARY TO CONSIST OF 50/50 MIX OF ANNUAL
RYEGRASS AND CEREAL WINTER RYE, OR IN MARCH AND APRIL TO CONSIST OF ANNUAL RYE, OR MAY
THROUGH AUGUST TO CONSIST OF GERMAN MILLET. STRAW MULCH TO BE APPLIED AT 80LBS/100SF.
ALTERNATIVES ARE SUBJECT TO APPROVAL BY THE COUNTY EROSION CONTROL INSPECTOR.
18. PERMANENT STABILIZATION SHALL BE LIME AND FERTILIZER, PERMANENT SEEDING, AND MULCH.
AGRICULTURAL GRADE LIMESTONE SHALL BE APPLIED AT 90LBS/1000SF, INCORPORATED INTO THE TOP
4-6 INCHES OF SOIL. FERTILIZER SHALL BE APPLIED AT 1000LBS/ACRE AND CONSIST OF A 10-20-10
NUTRIENT MIX. PERMANENT SEEDING SHALL BE APPLIED AT 160LBS/ACRE AND CONSIST OF 95%
KENTUCKY 31 OR TALL FESCUE AND 0-5% PERENNIAL RYEGRASS OR KENTUCKY BLUEGRASS. STRAW
MULCH IS TO BE APPLIED AT 60LBS/1000SF. ALTERNATIVES ARE SUBJECT TO APPROVAL BY THE COUNTY
EROSION CONTROL INSPECTOR.
19. MAINTENANCE: ALL MEASURES ARE TO BE INSPECTED WEEKLY AND AFTER EACH RAINFALL. ANY DAMAGE
OR CLOGGING TO STRUCTURAL MEASURES IS TO BE REPAIRED IMMEDIATELY. SILT TRAPS ARE TO BE
CLEANED WHEN 50% OF THE WET STORAGE VOLUME IS FILLED WITH SEDIMENT. ALL SEEDED AREAS ARE
TO BE RESEEDED WHEN NECESSARY TO ACHIEVE A GOOD STAND OF GRASS. SILT FENCE AND DIVERSION
DYKES WHICH ARE COLLECTING SEDIMENT TO HALF THEIR HEIGHT MUST BE CLEANED AND REPAIRED
IMMEDIATELY,
20. ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE REMOVED WITHIN 30 DAYS OF
FINAL SITE STABILIZATION, WHEN MEASURES ARE NO LONGER NEEDED, SUBJECT TO APPROVAL BY THE
COUNTY EROSION CONTROL INSPECTOR.
21. THIS PLAN SHALL BE VOID IF THE OWNER DOES NOT OBTAIN A PERMIT WITHIN 1 YEAR OF THE DATE OF
APPROVAL. (WATER PROTECTION ORDINANCE SECTION 17®204G).
22. PERMANENT VEGETATION SHALL BE INSTALLED ON ALL DENUDED AREAS WITHIN NINE (9) MONTHS AFTER
THE DATE THE LAND DISTURBING ACTIVITY COMMENCED. (WATER PROTECTION ORDINANCE SECTION
17-207B).
EU N CQN UCTItDN
1. CONTRACTOR TO SCHEDULE AND ATTEND A PRE --CONSTRUCTION MEETING WITH ALBEMARLE COUNTY AND
OBTAIN ALBEMARLE COUNTY LAND DISTURBANCE PERMIT PRIOR TO THE START OF ANY LAND DISTURBING/
CONSTRUCTION ACTIVITIES ASSOCIATED WITH THIS PLAN.
2. INSTALL PERIMETER CONTROLS AND INLET PROTECTIONS IN LOCATIONS SHOWN ON THE PLANS PRIOR TO
BEGINNING CONSTRUCTION.
3. PERFORM GRADING OPERATIONS TO BRING SITE TO ELEVATIONS AND MAINTAIN POSITIVE DRAINAGE TO
SEDIMENT TRAPPING DEVICES, STABILIZE AREAS AS THEY ARE BROUGHT TO GRADE.
4. CONSTRUCT IMPROVEMENTS AS SHOWN ON PLANS.
5. STABILIZE ALL REMAINING DISTURBED AREAS.
6. ALL EROSION AND SEDIMENT CONTROLS SHALL BE REMOVED WITHIN 30 DAYS OF FINAL SITE
STABILIZATION OR WHEN MEASURES ARE NO LONGER NEEDED. REMOVALS ARE SUBJECT TO APPROVAL BY
THE COUNTY EROSION CONTROL INSPECTOR.
7. CLOSE OUT THE PROJECT.
DESIGNED BY: PROJECT: SET REV. NO.
JDB STONEFIELD
ENGINEERS DRAWN BY: C&F BANK, BLOCK
SURVEYORS HIMSIDSH AL13EMARLECOUNTY, VIRGINIA DRAWING NUMBER:
PLANNERS TITLE:
DIHR BY: EROSION & SEDIMENT CONTROL NARRATIVE TIVE -7
AsSOCIATES H
PC) Box 4119 3040AvemoresgPlace I DISCIPLINE: SCALE..: DATE: SHEET NUMBER:
1.ynchtntig, VA 24502 C1w!ott� il1,, VA 22911 W NA NUMBER: FILE NAME: Pi
Phone: 434.316.6080 Phone: 434.984.2700 CIVIL H: Nl�
WW1v.w1*yass0CW1ts.neC 217036.04 ������� �t��®l.� g V. NIA � I
3.07
3,09
URB 1"Al"I'LE11 H.MWhA QD
"'I C PICAL ORIENTATION OF
TY
S'� () N GRAVE L AND WIRE _MESH G,R,��l
C 0 N S T R U IC T 10 N 1P ) I
up
AC',"E 3" DROP INLET SEDIMENT TREA TMENT I
The minimum allowable heiglit measured from the upslope side of the dike is 18 hiches (see
Plate 3.09-1).
FI Ij TER R
R`v'_ I�A ENT
STAIDILIZANON BLANKFT)
SHALLOW
RD Tt�'MPO,,A-'AY',DII,,".!,,,I-�).S'.[O.N 11
SLOPE
4,
ON SHALLOW SLOPES, STRIPS OF
PROFILE E_
-xJ
NETTNG PROTECVE COV,-
Q Z_--k MAY IBE APPLIEDTIACROSSERINGS
THE SLOPE.
.18 MIN.
GRAVEL (12"MIN. DEPTH) IIAVLL
RIc '1( RUNOFF WATER
CO N'S f R i KI
ASPHAI PiNVED F1 Lily
WITH SEDIMENT
Ar'CESS F-G
V11iVSH BERM
WHERE THERE IS A BERM AT -THE TOP OF THE SLOPE,
y
q_p �.... ....
BRING THE MATERIAL OVER THE BERM AND ANCHOR IT
4
z
I VU BEHIND THE BERM.
4 5' min4
'z ......... . - - --- ---
2%,
'4
12"
2 "lul
�A_,�I- ju 't ,P� Wyj T)� I
STEEP
CRAEL A VLSE',R'
SLOPE
W"IRE MESI'l
RUiNOff WATER ,� , rI " I
41
Pu !T* NE DRAMA" F.' -WIRE MESH
F LTERED WA!1,�
I!Sl E XT IE IN I D Flu L L WID-11 SEDIM E R ON STEEP SLOPES, APPLY
ENT 'RING PARALLEL
TO S EE ED` I M 't-ENIF
PROTECTIVE COVE
F fNIGIRES".", AND FILTERED 'Al
TO THE DIRECTION OF FLOW
7 nn
WATER AND ANCHOR SECURELY. - - ----------- -- -
6
6 1 Source: Va, DSWC' Plate 30)-1
q M,
... .........
PLAN rlii .-iF ....... .
4� Z11
M 1'
TI
-1 2t ."I . .......... ..
....... . ... LDRA!NAX
TCj SENMENT
z APPLICATION S ILI E C I Ff C . . ...... 4"
BRING MATERIAL DOWN TO A LEVEL AREA BEFORE
THE END
TERMINATING THE INSTALLATION. TURN
UNDER 4" AND STAPLE AT 12" INTERVALS.
12"
TH1,1)' i\,1E;THOl_) OF' tNLET 1%�RB IN� ET %
PRO OTECTI 0 N IS APPLICABLE; P L I CA B L F:
r"', '�z, c,1
,,17
WHERE HEAVY CONC ' TNTHXTT�I� FLOWS ARE EXPEC EI)
SECTION A— BUT NOT �,IIHERE PONDING, AROLINI) THE -)TR[_1CTLjkE DITCH FLOW
Nf[GHT CAUSF: EXCESSIVE [NCONVEN[ENCE OR DAMAGrE
IN DITCHES, APPLY PROTECTIVE COVERING
APIPIACA'NON
TO ADJACENT STRIJCTI_JHE�� AND UNPROTECTED AREAS.
A n�_nnun watei, tap Of I itich nins( be histalled -�Arith a 11williffilill fiicli ball1cock PARALLEL TO THE DIRECTION OF FLOW.
USE CHECK SLOTS AS REQUIRED. AVOID
JOINING MATERIAL IN "THE CENTER OF
ah-- slititoff ve sllpplyh�g a NNasli hose AvAll a diameter of 1, 5 iliche4 for adequate THIS �METHOD OF INLET PROTECTION IS APPLICABLE AT CU'RB INLETS THE DITCH IF AT ALL POSSIBLE.
cou tant pressaire, Wash water nimst be canied. away fi,onx tile elitfance, to an Wf1ERE PONDING IN FRONT OF THE STRUCTL)RE IS NOT LIXELY TO CALISE
ICE OR DXMAGE, TO ADJACENT 'STRUCTURES AND UNPROTECTED
approved settffit.g ilrea to remove sedhhent. At seditneitt sliA be prevented froill GRAVEL SHALL HE VDOT 4.357 OR ��15 CO�\RSE INCONVENIEN,
A RE AS.
elltel-ilil- "'A'01411 (if ilftls, ditclies of wiltef.ccillf"""e's, A (_1'r G , H 11_� GATT.
PAVED WASH RACK 4, GRAVEL SHALL BE VDOT #3, #357 OR 6 COARSP',,AOGRE(xATE,
N O <E
SOURCE: VA. DS��VC I'L,V11. 3.07 2 SOURCE: ADAPTED FFROMLUDLOW PRODUCTS BROCHURE PLATE: 3.36-1 S3,1" i..,A
Source.- Va. DSWC Plate 3,07-6
1992 138
1992 3.32 1992 331
CONST-RUCTION OF A SILT FENCE
gjjjgjg� WIN !:I
(WITHOUT WIRE, SUPPORr-In,' FEN CI 6jr, A ND A P, A. 10 % R. I IV G - 4 up PIPE OUTLET CONDITIONS MEMO,
TABLE 3.31-B TS
1. SET THE STAN-ES. 2. E;XCAVATE A X'X d" TRENCH A A TABLE 3.32-D S
� I P�� 1,0 PE ALONG THE U�Nl: 01' SITE SPECIFIC SEEDING MIXTURES FOR PIEDMONT AREA ACC)EPTABLEZ TEMPORALRN! SEES INGPIANT INIATERIALS
T
6'MAX. otal Lbs. rA_&re "QUICK REF L, REINCE FOR ALL RECIONS"
Ct —
0
f I Minimum Care..I,qNRate
0
PlatitiiW, Da� te—s S�
PIPE OUTLET TO FLAT -'Commercial or Resi&ntial 175-200 lbs,
ORfP LINE: AREA 4VITF1 NO DEFINED -Kentucky 31 or Turf -Type Tall Fescue 95-100%
IT F,[,/\N VIE�v CHANNEL - Irvroved Perennial Ryegrass, 0-5% Sept. I - Feb. 15 50150 Mix of
- Kentucky Bluegrass 0-5% Annual Ryegrass
FLOW
i �� � f ` : SNOW FENCE -M & 50-100
111 11.0 IW a Hieh aintenance Lawn 200-250 lbs, Cereal
Kentucky 31 or Turf -Type Tall Fescue 100%
4" —"1
3. STAPLIl-'ILTEH \IATE1�1\L -4. P)AC[\_F'NA, AND COMPACT zz_
TO STAKF:S ANI) EXTFIND THE E.AC'Av-\TfJ) Ojl_ 00 010 CI ae-neral. Slope (1.1 orTess
JiH IT INTO T E THENCH. 00 Feb. 16. - Apr. 30 AnnualRyegrass 60-100
T ll - Kentucky 31 Fescue 128 Jibs, jmw)
SECTION A FILTER CLOTH KEY IN G"-W; RECOMMENDED FOR ENTIRE PERIMETER - Red Top Grass 2 lbs.
Seasonal Nurse Crop .20 tbs.
BOARD FENCE — 150 lbs. May I - Aug 31 German IN -fillet 50
10
if2 COO FEN owM 1,-aintenance,,Silope (Stgger tLjp Lin 3*1) (Setaija iqLL
-
Z Jill HN.)
0
PLAS5`11C FENCE - Kentucky 31 Fescue 108 lbs.
- Red Top Grass 2 lbs.
. . . . . . . F CORRECT METHODS OF TREE FENCING
- Seasonal Nurse Crop 20 lbs.
FLOW 0 Source, Va. DSWC
to 1111 Crownvetch 20 tbs.
PIPE OUTLET TO WELL 1.50 lbs.
DEFINED CHANNEL
SHEET FLOW 1-NSTALLATION
PLAN VIEW Use seasonal nurse crop in accordance with seeding dates as stated below:
February kith through April .................. Annual Rye
a May Ist through August 15th ..... ............. Foxtail Millet
FT W
August 16th through October............. .... ..... . t"nual Rye
A 0 November through February 15th , Winter Rye
Ix B
CI Substitute Sericea lespedeza for Crownvetch east of Farniville, Va. (May
4-,
SECTION A --A through September use hulled Sericea, all other periods, use unhulled Sericea).
I,'IL1L[? CLOTH KM IN W-9 M RECOMENDED FOR ENTIRE, Pr: R 1 \4 ETE R If Flatpea is used in licit of Crownvetch, increase rate to 30 lbs./acre, All legume
NOTES: 1. APRON LINING MAY BE HIPHAP, G'1z0(:TED IaIPRAP. GAHION seed must be propefly inoculated. Weeping Lovegrass may be added to ally slope
HA�Sl\'ET, OR CON(T]"I'F, or low -maintenance niLx during wm arer seeding period5; add 10-20 lbs,/acre in.
POINTS A SHOI,�IID BE Ilic;IIER THAN POINT B. CORRECT TRUNK ARMORING I,a IS T11F LEN(,"I'll 0 ' THE RIPPAP APRON AS CALCUI,\TED mixes.
'EWAY INSTALLATION USING PLATES 3,18-3 AND 3A8-1.
I)RAINACT �3- d 7T I.,,) TIMFS THE ;�TONE DIAMETER. HUT NOT
TRIANGULAR BOARD FENCE LESS T[IAN 6 INCHES. (FRONT ETEVATIO\)
SOURCE: Adapted from Installation of Straw and Fabric Filter Barriers for Sediment Control,VA. DAC PLATE. 3.05-2 Source: Va. DSWC Plate 3.18-1
Sherwood and Wyant
Source: Va. DSWC Plate 3.38-2
OSET REV. NO.
�A, - L..
2 REVISED SHEET NUMBER JD 8/28/19 DSIGNF0 BY. PROJECT.. 0 EC T
'T lHi pp,
IJDB STONEFIEFLD TOWNCENTER
2
ENGINEERS C&F BANK, BLOCK C
DRAINN BY.
SURVEYORS ALBEMARLE COUNTY, VIRGIA DRAWING NUMBER:
HMSIDSB
PLANNERS TITLE:
. . . . . . . . . . .... D114R B'�. EROSION & SEDIMENT CONTROL DETAILS
Lie. No. 7
c1q :I EH
0 SHEET NUMBER:
AV Box 3040 Aveniore Sq Place WWA N FILE NAME: INE: SCALE: DATE.:
u Lynchburg, VA 24502 Charlottesville, VA 22911
U M B ER: D1S(_'IPL
Y1 0 Phone: 434.316.6080 Phone: 434.984.2700 CIVIL H:Nl�
Al, 217036.04 703604C_.ENS-3.dwg 51141/ 19 1 10 of 14
NO. SHEET REVISION BY DATE NO. SHEET REVISION BY DATE V.- NIA
Short Version BMP Computations For Wor street 2
Albemarle County Water Protection Ordinance: Modified Simple Method
Plan : Stonefield Blacks G FSP Water Resources Area::
......... _ ......... . ........
Prepares JDB Date: Rev. 419t20.1 9...._.
Project Drainage Area Designation black G
.............................................................................
L storm pollutant export in pounds, L = [P(Pj)RV12 i [ C(A)2.72 )
Rv mean runoff coefficient, Rv= 0.05 + 0.009(l)
3 small storm correction factor, 0.9
l percent imperviousness
P annual precipitation, 43" in Albemarle
...................................................................
A project area in acres in subject drainage area,
C pollutant concentration, mgfl or ppm target phosphorus
f factor applied to RR
V required treatment viume in cy, 0.5" over imperv. area = A(1)43560(0.5112)/27
RR required removal , L(post)- fx L(pre)
%RR removal efficiency , RR100IL(post)
Impervious Cover Computation (.values In feet & square feet)
(te€n
:pre -development 'Area ;past -development `Area
Paved Length Width subtotal Length Width subtotal
L...... .. . ?
..
Roadv=rays
.
Driveways Length" Width no. subtotal Length Width no subtotal
.......
:and walks
Parking Lots Area 1 Area 2 Area 3 Area i .. Area 1Area 2 Area 3 Area 4
�J
Gravel areas Area 1 Area 2 subtotal i I su :Area 1: Area 2 btotal z
.
x070= '` x0.70=
.............................. ._.._ ._....... ..... ........ ......... .....
Structures Area no. subtotal Area no.
.........
....... . ............ .. ..........
i
Actively -grazed pasture &....... Area Area
.yards and cultivated turf x 0.08 = x 0.08 =
. ...... ......... ...._...... .. ............
Ac.trve crop !arid Area Area
x 0.25 1 x 0.25 =
..
Other impervious Areas Area 1 Area 2 Area 3 Area 1 Area 2 Area 3
200,230.
Impervious hover 0 /a` 745 , :
I(pre) I(post) .
Rv(pQst).1 _ v
0.72 at)M
Now Development (For Development Areas existing rrnpervrous cover <= 200%)
C f I (pre) * : Rv(pre) L(pre) L(post) RR % RR Area Type
0,70 ' 1.00 2ti44< 0.23 . 8 71 27.29 s 18.58 . 68%' Datelopment Area
......_....... - -- _. _..
0 35 1.00 , t °fg. 0.05 0.95 € 13.65 < '12.70 ; 93ua DrinkingWater Watersheds
..
0.40 ! 1.00 . 1 �F 0.06 : 1.28 15.59 14.32 9� /o; Ether Rural Land
kmin. values
Redevelopment (For Development Areas, existing Impervious cover > 201/1o)
C f I (pFe) Rv(pre) L(pre), ; ..L(post) RR . % RR Area Type
0 70 0.9Q 2r%v 0.23 8.71 27.29 " 19.5 : 71 i"v Developrrtent Area
.. _.....
0 5 0.85 0{'a 0.05 0 9d 1a 65 12.84 94°f, Drinking Water Watersheds
0.40 0.85 € 1 to 0.06 i 1.28 15.59 `• 14.51 ! 93ura Other Rural Land
rev. 30 May 2002 JMK
STORMWATER NARRATIVE
STORMWATER DETENTION FOR THE IMPROVEMENTS PROPOSED WITH THIS
SITE PLAN ARE PROVIDED BY THE PERMANENT NORTH SWM FACILITY
LOCATED IN THE ADJACENT COSTCO PARKING LOT. DETAILS FOR THE
FACILITY ARE PROVIDED ON THE ALBEMARLE PLACE STORMWATER
MANAGEMENT PLAN AMENDMENT NO.4, WPO# 2010-000 3 AND WPO#
2013-69. AN ASSUMED POST DEVELOPED IMPERVIOUS COVER OF 90%
WAS UTILIZED IN THE DESIGN OF THE UNDERGROUND DETENTION
SYSTEM FOR BLOCKS F Sr G. THE AS -BUILT IMPERVIOUS COVER FOR
BLOCK F IS 85.5%. THE POST -DEVELOPED IMPERVIOUS COVER FOR
BLOCK G IS 74.5% INCLUDING THE IMPROVEMENTS PROPOSED AS PART
OF THIS PLAN.
STORMWATER QUALITY FOR THE IMPROVEMENTS PROPOSED WITH THIS
SITE PLAN ARE PROVIDED BY THE STORMFILTER AND VORTECHS UNITS
CONSTRUCTED AS PART OF THE ALBEMARLE PLACE STORMWATER
MANAGEMENT PLAN AMENDMENT NO.4, WPO# 2010-00023 AND THE
FILTERRAS INSTALLED AS PART OF THE STONEFIELD BLOCK G FINAL SITE
PLAN, WPO# 2014-00102. THE SITE IS GRANDFATHERED PER
9VAC25---870---48 AND MEETS THE WATER (QUALITY REQUIREMENTS OF
PART II C SET FORTH IN 9VAC2®70-96. PER PART II C THE
STORMFILTER AND VORTECHS UNITS PROVIDE A POLLUTANT REMOVAL
RATE OF 60% AND THE FILTERRAS PROVIDE A POLLUTANT REMOVAL
RATE OF 74 %.
THE REQUIRED OVERALL POLLUTANT REMOVAL RATE IS 68% FOR BLOCK
G. PLEASE REFER TO BMP COMPUTATIONS USING THE SIMPLE METHOD
tm WORKSHEET PROVIDED ON THIS DRAWING.
I
POLLUTANT REMOVAL CALCULATIONS FOR BLOCK.
REFERENCE SIMPLE METHOD WORKSHEETS AND THE BMP ANALYSIS AREA
MAP ON THIS DWG.
0) TOTAL BMP ANALYSIS AREA = 6.17 ACRES
TOTAL L(PRE) 8.71 LBS
TOTAL L(POST) = 27.29 LBS
0 TOTAL POLLUTANT REMOVAL REQUIRED = 18.58 LBS
TOTAL POLLUTANT REMOVAL PROVIDED = 18.59 LBS
REMAINING: 18.59 - 18.58 = 0.01 LBS
AS SHOWN ON DWG. C-14 OF THE BLOCK G FINAL SITE PLAN
(WP02014--00102) THE EXISTING STORMFILTER, VORTECHS, AND FILTERRAS
PROVIDE A POLLUTANT REMOVAL RATE OF 18.59 LBS/YR FOR BLOCK G.
THEREFORE THE POLLUTANT REMOVAL REQUIREMENTS ARE MET FOR THIS
U_ AREA.
Id
Cq
CL
10-
a 1 REVISED POLLUTANT REMOVAL CALCULATIONS JDB 7/ 1 /19
40-2
2 REVISED POLLUTANT REMOVAL. CALCULATIONS& SHEET NUMBER JDB 8/28/19
P0
NO. �NFFT RFVLSIt)N BY DATE NO.
SHEET REVISION
BY I DATE
SH 0.
Lie. NG�����-i'6i �
rQNAb