HomeMy WebLinkAboutWPO201900061 Plan - VSMP WPO VSMP 2020-08-12SITE DATA
OWNER:
DEVELOPER:
PLAN PREPARER:
TAX MAP PARCEL No:
PARCEL AREA:
ZONING:
PROPOSED USE:
BUILDING AREA:
HYDRAULIC & GEORGETOWN LLC
400 LOCUST AVENUE, SUITE 3
CHARLOTTESVILLE, VA 22902
BMC HOLDINGS GROUP LLC
400 LOCUST AVE, SUITE 3
CHARLOTTESVILLE, VA 22902
ROUDABUSH, GALE, & ASSOCIATES
172 SOUTH PANTOPS DRIVE
CHARLOTTESVILLE, VA. 22911
(434)-977-8121
060FO- 00- 00- 00300
1.05 ACRES
NEIGHBORHOOD MODEL DISTRICT. PARCEL IS SUBJECT TO ZMA2006-14 WITH ASSOCIATED PROFFERS
AND CODE OF DEVELOPMENT; AIRPORT OVERLAY AND ENTRANCE CORRIDOR OVERLAY DISTRICTS
PROFESSIONAL OFFICES
16,815 GROSS SF, MAXIMUM ALLOWED
14,289 GROSS SF, PROPOSED (INCL. PARKING LEVEL)
BUILDING HEIGHT ALLOWED: 2 STORIES: 50' MEASURED FROM FRONT FACADE
3 STORIES. • 60' MEASURED AT THE BACK TO INCLUDE BASEMENT
BUILDING HEIGHT PROPOSED: FRONT 32' MEASURED FROM FINISHED FLOOR TO PARAPET
PARKING SETBACK: 10' MINIMUM
BUILDING SETBACKS: (IN ACCORDANCE WITH THE GENERAL DEVELOPMENT PLAN)
(MINIMUM) FRONT SETBACKS FROM BUILDING CORNERS: 9.63' & 13 47u
FRONT SETBACKS FROM CENTER OF BUILDING: 15.22' & 21.85'
BUILDING SETBACKS FROM THE RA ZONING: 47.50'
AREA SUMMARIES: TOTAL BUILDING COVERAGE = 6,765 SF (157-)
TOTAL IMPERVIOUS COVERAGE (INCL BUILDING) = 20,765 SF (45i)
TOTAL OPEN SPACE = 24, 973 SF (557.)
MAGISTERIAL DISTRICT.' JACK JOUETT MAGISTERIAL DISTRICT
WA TERSHED: I VY CREEK (A WA TER SUPPL Y PROTECTION AREA)
BOUNDARY SOURCE: SUBDIVISION PLAT, LOT 1, "GEORGETOWN GREEN" PREPARED BY W.S. ROUDABUSH, DATED JUNE 20, 1967,
RECORDED AT DB 440 PG 93.
TOPOGRAPHY- TAKEN FROM GENERAL DEVELOPMENT PLAN BY DOMINION DEVELOPMENT RESOURCES, LLC (2006); TREE
SURVEY BY ROUDABUSH, GALE & ASSOCIATES, JANUARY 2019, WATERLINE LOCATION CHECK BY ROUDABUSH,
GALE & ASSOCIATES, SEPTEMBER 2019.
BENCHMARK: TRAFFIC BOX 614.79. TAKEN FROM GENERAL DEVELOPMENT PLAN BY DOMINION DEVELOPMENT RESOURCES, LLC
(2006)
DA TUM: HORZ.: NA VD 88 VER T.: NAD83
FLOODPLAIN: THIS PROJECT IS LOCATED WITHIN "ZONE X" AS SHOWN ON FLOOD INSURANCE RATE MAP. COMMUNITY PANEL
NUMBER 510003C 0279 D. EFFECTIVE DATE: FEBRUARY 4. 2005.
PARKING REQUIRED: PER GENERAL DEVELOPMENT PLAN, 1 SPACE PER 200 SF NET LEASABLE AREA = 9,376/200 = 47 SPACES
PARKING PROVIDED: 50 PARKING SPACES TOTAL
2 ADA VAN ACCESSIBLE SPACES**
*3 SPACES RESERVED FOR IMP 60E-1 PER DB 1591 PG 160
**ACCESSIBLE PARKING SPACES AND ACCESS ISLES SHALL NOT HAVE A SURFACE SLOPE GREATER THAN 1:48.
ACCESS ISLES SHALL BE AT THE SAME LEVEL AS THE PARKING SPACE THEY SERVE
RETAINING WALLS. RETAINING WALLS GREATER THAN 3 FEET IN HEIGHT REQUIRE A SEPARATE BUILDING PERMIT. WALLS C
EXCEEDING 4 FEET IN HEIGHT REQUIRE AN STAMPED ENGINEERED DESIGN. PLEASE SEE RETAINING WALL
DESIGN BY OTHERS UNDER SEPARATE COVER. -
NO EVIDENCE OF A BURIAL SITE WAS FOUND ON SUBJECT PARCEL.
NO STREAM BUFFER(S) ARE PRESENT ON THE SUBJECT PARCEL. _
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THE SUBJECT PROPERTY IS NOT LOCATED WITHIN AN AGRICULTURAL -FORESTAL DISTRICT.
THE SUBJECT PROPERTY IS LOCATED WITHIN THE JURISDICTIONAL AREA FOR PUBLIC WATER AND SEWER. -
GENERAL NOTES
1, THE CONTRACTOR SHALL BE RESPONSIBLE FOR OBTAINING ALL NECESSARY PERMITS, INSPECTIONS,
BONDS AND OTHER APPROVAL RELATED ITEMS IN ACCORDANCE WITH LOCAL AND STATE POLICY.
PRIOR TO COMMENCEMENT OF CONNECTION TO ANY EXISTING ROAD, A PERMIT FOR SAID
CONSTRUCTION SHALL BE OBTAINED FROM THE VIRGINIA DEPARTMENT OF TRANSPORTATION
(HEREAFTER ABBREVIATED VDOT).
2. ALL PAVING AND DRAINAGE RELATED MATERIALS AND CONSTRUCTION METHODS SHALL CONFORM TO
CURRENT STANDARDS AND SPECIFICATIONS OF VDOT UNLESS OTHERWISE NOTED.
3. EROSION AND SEDIMENT CONTROL MEASURES SHALL BE PROVIDED IN ACCORDANCE WITH THE
APPROVED EROSION AND SEDIMENT CONTROL PLAN AND SHALL BE INSTALLED PRIOR TO ANY
CLEARING, GRADING OR OTHER CONSTRUCTION.
4. THE CONTRACTOR SHALL VERIFY THE PROPOSED LAYOUT, THE VERTICAL DEPTHS AND LOCATION OF
PRIVATE UTILITIES WITH ITS RELATIONSHIP TO THE EXISTING SITE SURVEY. THE CONTRACTOR SHALL
ALSO VERIFY ALL DIMENSIONS, SITE CONDITIONS, AND MATERIAL SPECIFICATIONS AND SHALL NOTIFY
THE OWNER AND ENGINEER OF ANY ERRORS, OMISSIONS OR DISCREPANCIES BEFORE COMMENCING
OR PROCEEDING WITH WORK.
5. DEVIATIONS FROM OR CHANGES TO THESE PLANS WILL NOT BE ALLOWED UNLESS APPROVED BY
THE ENGINEER.
6. THIS PLAN DOES NOT GUARANTEE THE EXISTENCE OR NON-EXISTENCE OF UNDERGROUND UTILITIES.
PRIOR TO ANY CONSTRUCTION OR EXCAVATION THE CONTRACTOR SHALL VERIFY THE EXISTENCE
AND LOCATION OF, OR THE NON-EXSITENCE OF, UNDERGROUND UTILITIES. THE CONTRACTOR SHALL
BE RESPONSIBLE FOR NOTIFYING "MISS UTILITY (1-800-552-7001).
7. THE CONTRACTOR IS REQUIRED TO TAKE PRECAUTIONARY MEASURES TO PROTECT ANY EXISTING
UTILITIES NOT OF RECORD OR NOT SHOWN ON THESE PLANS. THE CONTRACTOR SHALL BE
RESPONSIBLE FOR REPAIRING, AT HIS EXPENSE, ANY EXISTING UTILITIES DAMAGED DURING
CONSTRUCTION. IF A UTILITY IS DAMAGED DURING CONSTRUCTION, STOP WORK IMMEDIATELY AND
NOTIFY THE ENGINEER.
8. CONTRACTOR AGREES THAT HE SHALL ASSUME SOLE AND COMPLETE RESPONSIBLY FOR JOB SITE
CONDITIONS DURING THE COURSE OF CONSTRUCTION OF THIS PROJECT, INCLUDING SAFETY OF ALL
PERSONS AND PROPERTY; THAT THIS REQUIREMENT SHALL APPLY CONTINUOUSLY AND NOT BE
LIMITED TO NORMAL WORKING HOURS; AND THAT THE CONTRACTOR SHALL DEFEND, INDEMNIFY AND
HOLD THE OWNER AND THE ENGINEER HARMLESS FROM ANY AND ALL LIABILITY, REAL AND
ALLEGED, IN CONNECTION WITH THE PERFORMANCE OF WORK ON THIS PROJECT, EXCEPTING FOR
LIABILITY ARISING FROM "THE SOLE NEGLIGENCE OF THE OWNER OR THE ENGINEER".
9. ANY DAMAGE TO EXISTING PHYSICAL FEATURES (WALKS, LIGHTS, TREES, SHRUBS, ETC) SHALL BE
THE RESPONSIBILITY OF THE CONTRACTOR. REPAIRS OR REPLACEMENT SHALL BE MADE AS
NECESSARY AT NO COST TO THE OWNER.
10. ALL TURF AREAS THAT ARE IMPACTED OR DISTURBED BY THE CONTRACTOR VEHICLES, EQUIPMENT
OR ACTIVITY SHALL BE REPAIRED, REGRADED, AND RESEEDED.
11. PARKING FOR THE CONTRACTOR'S VEHICLES SHALL BE COORDINATED THROUGH THE OWNER. THE
OWNER IS NOT RESPONSIBLE FOR THE LOSS OF ANY MATERIAL STORED AT THE SITE. PARKING OF
EMPLOYEE VEHICLES WILL BE ACCOMMODATED AT THE SITE.
12. THE POSTED SPEED LIMIT SHALL BE 5 MPH BELOW DESIGN SPEED.
13. ALL ROADWAYS WITHIN THIS DEVELOPMENT ARE TO REMAIN PRIVATE AND ARE NOT TO BE
MAINTAINED BY VDOT OR LOUISA COUNTY.
14. ALL PAVEMENT MARKINGS & SIGNAGE SHALL BE IN ACCORDANCE WITH THE CURRENT VDOT &
MUTCD REGULATIONS.
IN
1 � 1 � • � Jammu
GENERAL EROSION CONTROL NOTES
WORK AREA PROTECTION & MAINTENANCE
1. ALL FENCES REQUIRED TO BE REMOVED OR DISTURBED BY CONSTRUCTION SHALL BE SALVAGED, STORED, PROTECTED AND RE -INSTALLED BY CONTRACTOR AT THE DIRECTION OF AND LOCATION DESIGNATED BY
THE PROJECT MANAGER. IF SUCH FENCE MATERIAL CANNOT BE REUSED DUE TO DAMAGE CAUSED BY CONTRACTOR, CONTRACTOR SHALL INSTALL NEW FENCE OF THE SAME TYPE OF MATERIAL. TEMPORARY
FENCING REQUIRED BY PRIVATE PROPERTY OWNERS SHALL BE PROVIDED BY CONTRACTOR. CONTRACTOR IS ADVISED TO CONTACT PROPERTY OWNERS AT LEAST FORTY-EIGHT (48) HOURS IN ADVANCE OF
REMOVING ANY FENCE IN ORDER TO COORDINATE RELOCATION AND/OR PROTECTION OF ANY ANIMALS, AND TO ESTABLISH AND CONFIRM WITH THE OWNER THE PRE -CONSTRUCTION CONDITION OF ANY FENCE
TO BE REMOVED, DISTURBED OR REPLACED.
2. CONTRACTOR IS PERMITTED TO WORK IN THE PUBLIC RIGHT-OF-WAY (FOLLOWING ISSUANCE OF VDOT APPROVAL) AND ANY TEMPORARY OR PERMANENT EASEMENT (FOLLOWING VERIFICATION OF EXISTENCE OF
EASEMENT) SHOWN ON THE PLANS. HOWEVER, CONTRACTOR SHALL NOTIFY PROPERTY OWNER(S) FORTY-EIGHT (48) HOURS PRIOR TO WORKING ON ANY PRIVATE PROPERTY TO GAIN AND COORDINATE ACCESS
AND TO DETERMINE A STORAGE AREA FOR MATERIALS IF NEEDED. COORDINATION OF ACCESS TO PUBLIC RIGHT-OF-WAY AND STORAGE OF MATERIALS THEREON SHALL BE COORDINATED WITH VDOT AND THE
PROJECT MANAGER. CONTRACTOR'S FAILURE TO SO NOTIFY AND COORDINATE WITH PROPERTY OWNERS AND/OR THE PROJECT MANAGER MAY RESULT IN DELAYS.
3. CONTRACTOR SHALL, AT HIS EXPENSE, MAINTAIN THE WORK SITE IN A CLEAN AND ORDERLY APPEARANCE AT ALL TIMES. ALL DEBRIS AND SURPLUS MATERIAL COLLECTED SHALL BE DISPOSED OF OFF THE
WORK SITE BY CONTRACTOR, AT HIS EXPENSE.
4. EXISTING LAWNS, TREES, SHRUBS, FENCES, UTILITIES, CULVERTS, WALLS, WALKS, DRIVEWAYS, POLES, SIGNS, RIGHT-OF-WAY MONUMENTS, MAILBOXES AND THE LIKE SHALL BE PROTECTED FROM DAMAGE DURING
THE WORK. ANY DAMAGE CAUSED TO SUCH ITEMS SHALL BE REPAIRED OR REPLACED BY CONTRACTOR AT NO ADDITIONAL COST. PROPERTY PINS DISTURBED BY CONTRACTOR THAT ARE NOT SHOWN ON THE
PLANS TO BE DISTURBED SHALL BE RESTORED BY A LICENSED SURVEYOR AT CONTRACTOR'S EXPENSE.
5. CONTRACTOR SHALL EMPLOY EROSION CONTROL DEVICES AND METHODS AS REQUIRED TO MEET THE REQUIREMENTS AND INTENT OF THE LOCAL EROSION CONTROL ORDINANCE. CONTRACTOR SHALL PROVIDE
THE NECESSARY DIVERSION DITCHES, DIKES OR TEMPORARY CULVERTS REQUIRED TO PREVENT MUD AND DEBRIS FROM BEING WASHED ONTO THE STREETS OR PROPERTY. CONTRACTOR'S VEHICLES SHALL BE
KEPT CLEAN TO PREVENT MUD OR DUST FROM BEING DEPOSITED ON STREETS. NO AREA SHALL BE LEFT DENUDED FOR MORE THAN SEVEN (7) CALENDAR DAYS.
VEGETATION
1. PRIOR TO REMOVING ANY VEGETATION, CONTRACTOR SHALL MEET WITH THE PROPERTY OWNERS AND THE PROJECT MANAGER TO REVIEW THE LIMITS OF CONSTRUCTION AND OBTAIN PERMISSION TO REMOVE
VEGETATION REQUIRED TO DO THE WORK.
2. TREE AND PLANT ROOTS OR BRANCHES THAT MAY INTERFERE WITH THE WORK SHALL BE TRIMMED OR CUT ONLY WITH THE APPROVAL OF THE PROJECT MANAGER. ANY TREES OR PLANTS WHICH ARE SHOWN
TO REMAIN THAT DO NOT INTERFERE WITH THE WORK, BUT ARE DAMAGED BY CONTRACTOR OR HIS SUBCONTRACTORS, SHALL BE REPAIRED OR REPLACED BY CONTRACTOR AT NO ADDITIONAL COST.
3. CONTRACTOR SHALL CLEAN UP, RESTORE, SEED AND MAINTAIN ALL DISTURBED AREAS IMMEDIATELY UPON COMPLETION OF WORK ON EACH SITE. TOPSOIL, SEED, FERTILIZER AND MULCH SHALL BE PLACED IN
ACCORDANCE WITH ESC AUTHORITY STANDARDS ON ALL DISTURBED AREAS. A PERMANENT STAND OF GRASS ADEQUATE TO PREVENT EROSION SHALL BE ESTABLISHED PRIOR TO FINAL ACCEPTANCE.
4. THE ACT OF RESEEDING SHALL NOT QUALIFY AS "STABILIZED". THE CONTRACTOR SHALL BE RESPONSIBLE TO ESTABLISH VEGETATION, NOT SIMPLY APPLY SEED AND MATERIALS.
SWM COMPLIANCE SUMMARY
STORMWATER RUNOFF COLLECTED WITHIN THE PROJECT WILL BE CONVEYED THROUGH A STORMWATER PIPE NETWORK TO AN UNDERGROUND
DETENTION SYSTEM (BY OTHERS).
REGARDING WATER QUALITY ANALYSIS:
9VAC25-870-63. WATER QUALITY DESIGN CRITERIA REQUIREMENTS.
1. NEW DEVELOPMENT, THE TOTAL PHOSPHORUS LOAD OF NEW DEVELOPMENT PROJECTS SHALL NOT EXCEED 0.41 POUNDS PER ACRE PER
YEAR, AS CALCULATED PURSUANT TO 9VAC25-870-65. CALCULATIONS SHOWN ON THIS PLAN WERE DETERMINED FROM ACCEPTABLE
METHODOLOGY "DEQ VRRM FROM NEW DEVELOPMENT COMPLIANCE SPREADSHEET -VERSION 3.0.
CONCLUSION:
THE WATER QUALITY PORTIONS OF THIS PLAN WILL BE SATISFIED WITH PURCHASING 0.81 IB/YR OF OFFSITE NUTRIENT CREDITS IN THE SAME
OF ADJACENT HYDROLOGIC UNIT CODE (02080204). COMPLIANCE OF 9VAC25-870-65.F: OFFSITE ALTERNATIVE IAW 9VAC25-870-69
PURCHASE OF NUTRIENT OFFSET CREDITS IS PROPOSED AND AFFIRMED.
SHEET 2---------- EXISTING CONDITIONS/SOILS MAP
SHEET 3---------- EROSION CONTROL PLAN PHASE I
SHEET 4---------- EROSION CONTROL PLAN PHASE II
SHEET 5---------- EROSION CONTROL NARRATIVE
SHEET 6---------- EROSION CONTROL NOTES & DETAILS
SHEET 7---------- SWM NOTES & DETAILS
SHEET 8---------- CHANNEL PROTECTION COMPLIANCE
SHEET 9---------- FLOOD PROTECTION COMPLIANCE
CONTRACTOR SHALL KEEP ACCURATE RECORDS OF ANY CHANGES SUBSTITUTIONS, ALTERATIONS,
VARIATIONS OR UNUSUAL CONDITIONS ENCOUNTERED OR IMPLEMENTED WHILE ENGAGED ON THIS
PROJECT. THESE RECORDS SHALL BE IN THE FORM OF `REDLINES". "REDLINES" SHALL REFER TO THE
CONTRACTOR'S HAND ANNOTATIONS USING RED COLORED PEN/PENCIL TO DEPICT ACTUAL CHANGE,
SUBSTITUTION, OR CONDITION.
PRIOR TO CONTRACTOR REQUESTING PARTIAL OR FULL PAYMENT, CONTRACTOR SHALL PROVIDE THE
OWNER WITH AN UP-TO-DATE CONTRACTOR'S RECORD DRAWING. SPECIFICALLY, THIS SET OF PLANS,
ISSUED TO THE CONTRACTOR AS FINAL CONSTRUCTION DRAWINGS, SHALL BEAR THE `REDLINE"
MARKINGS LISTED BELOW AS WELL AS THE CONTRACTOR (AGENT OR SUPERINTENDENT) SIGNATURE
AND CERTIFICATION BELOW:
• REDLINES SHOULD ALWAYS BE ACCURATE NEAT, LEGIBLE, DATED AND REASONABLY SCALED
• ADD LARGE RED LETTERS TO TITLE SHEET WITH 'CONTRACTOR'S RECORD DRAWING' INCLUDING
CONTRACTOR'S NAME, DATE, AND OTHER RELEVANT INFORMATION
• CONTRACTOR'S REPRESENTATIVE OR SUPERINTENDENT SHALL INITIAL EACH SHEET. IF A SHEET
HAS NOT BEEN CHANGED AT ALL OR NO MARK HAS BEEN ADDED, LABEL THE SHEET ONLY 'NO
CHANGES'
• IF A SHEET HAS BEEN CHANGED OR MODIFICATIONS HAVE BEEN ADDED, LABEL IT 'REVISED'
• USE WRITTEN EXPLANATION TO DESCRIBE CHANGES. REFER TO SPECIFIC ACTIONS INSTEAD OF
REFERENCING CHANGE ORDER NUMOERS OR RELATED DOCUMENTS
• USE CLEAR LETTERING
• NEVER REMOVE OLD VALUES OR DETAILS, JUST REDLINE OR "X" THROUGH THEM. IF THERE IS NO
ROOM FOR THE NEW VALUE, YOU CAN GO TO THE SIDE AND REDLINE THE REPLACEMENT VALUE.
• PROVIDE THE REDLINE DETAILS OF CHANGES OR ADDITIONAL INFORMATION, INCLUDING BUT NOT
LIMITED TO FABRICATION, ERECTION, INSTALLATION, LOCATION, SIZING, MATERIAL, DIMENSION,
ADDITIONS, RELOCATIONS, SUBSTITUTIONS, ETC
• BE SPECIFIC WHEN MAKING NOTES TO UNDERGROUND UTILITIES, SHOWING EXACT LOCATION,
DEPTH, AND MATERIAL USED (EXAMPLE: SEWER LATERALS)
• PROVIDE ALL NECESSARY INFORMATION OF CONTRACTOR'S DESIGNED SYSTEMS OR SUBSTITUTIONS
• CROSS OUT ANY PLAN REFERENCE TO "APPROVED EQUAL" AND REPLACE WITH ANY SPECIFIC
INFORMATION OF VARIANCE USED DURING THE CONSTRUCTION PROCESS
• ANY CHANGES IN INVERT ELEVATIONS, GRADE MODIFICATIONS, SLOPES, AND RELATED
INFORMATION ON PIPING UTILITIES, EARTHWORK, ETC. SHALL BE REDLINED.
• RECORD ALL UNEXPECTED OBSTRUCTIONS, COMPLICATING FACTORS, UNSUITABLE CONDITIONS
FOUND IN THE PROJECT AREA INCLUDING ROCK, UNUSUAL TOPSOIL CONDITIONS, BURIED DEBRIS,
ETC.
• ATTACH OR INCLUDE ANY SHOW DRAWINGS OR SUPPLEMENTAL INFORMATION TO THE
CONTRACTOR'S RECORD DRAWING
• CHANGES MADE AS A RESULT OF ANY REGULATORY OR OWNER INSPECTION PROCESS
CERTIFICATION STATEMENT:
THIS HAND -MARKED SET OF DRAWINGS HAS BEEN `REDLINED " TO PROVIDE ACCURATE DETAILED
RECORD OF ANY SUBSTANTIVE CHANGES TO THE APPROVED DESIGN DRAWINGS. ANY ITEM NOT
"REDLINED" ON THIS PLAN SET OR SUBSEQUENT PAGES SHOULD BE CONSIDERED TO BE
"CONSTRUCTED IN ACCORDANCE WITH THE DESIGN AS SHOWN".
NAME TITLE DATE
FOR: ---------------------------------------------- (CONTRACTOR)
REGARDING WATER QUANTITY ANALYSIS:
COMPLIANCE OF 9VAC25-870. 13.1.13 (CHANNEL PROTECTION):
IN ACCORDANCE WITH CHANNEL PROTECTION SECTION B.3.A) OF 9VAC25-870-66 OF VIRGINIA LAW; THE MAXIMUM PEAK FLOW RATE FROM THE ONE-YEAR 24-HOUR
STORM FOLLOWING THE LAND- DISTURBING ACTIVITY APPEARS TO BE IN ACCORDANCE WITH THE ENERGY BALANCE METHODOLOGY:
QDEVELOPED S I.F.*(QPRE-DEVELOPED* RVPRE-DEVELOPED)/RVDEVELOPED APPROVED
1 YR QDEVELOPED S I.F.* (1 YR QPRE-DEVELOPED RVPRE-DEVELOPED) /RVDEVELOPED by the Albemarle C^!,nty
Community Development -+ment
0.02 s 0.90* (0.27 * 0.32)/2.02 Date__ 1C 1/191 -,?,o0.02 s 0.04 File _
�A)ro 20(61 coo(( _
COMPLIANCE OF 9VAC25-870-66.0 (FLOOD PROTECTION):
IN REFERENCE TO FLOOD PROTECTION SECTION CA), THE SITE'S POINT OF DISCHARGE RELEASES CAPTURED STORMWATER INTO A CONVEYANCE SYSTEM THAT, FOLLOWING
LAND DISTURBING ACTIVITY, CONFINES THE POST -DEVELOPMENT PEAK FLOW RATE FROM THE 10-YEAR 24-HOUR STORM EVENT WITHIN THE STORMWATER CONVEYANCE
SYSTEM. Q/1 OPOST- DEVELOPED S Q/1OPRE-DEVELOPED
0/10POST-DEVELOPMENT = 0.09 cfs S Q/1OPRE-DEVELOPMENT = 1.23 cfs
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WATER TANK WITH (2) `
POWER WASHERS SHALL BE
STORED ONSITE AT THE
610 CONSTRUCTION ENTRANCE
\\ ONSITE CLEARING OF TREES WITHIN 1 1 \ T _____
1 ---_THE CONSERVATION AREA SHALL BE 1 TMP 60Fs wy a 1 I
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RETAINING WALLS. WALL CONSTRUCTION SHOULD BEGIN
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DESIGNED BY:
JLF (VSMP)
DRAWN BY:
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'CHECKED BY:
JLT
DATE:
OCTOBER 25 2019
SCALE:
1 "=20'
JOB:
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FILE:
19.0125
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OF 9
EROSION AND SEDIMENT CONTROL NARRATIVE
PRIOR TO CONSTRUCTION
1. OWNER SHALL POST SURETY BONDS FOR CONSTRUCTION, EROSION &
SEDIMENT CONTROL.
2. CONTRACTOR SHALL OBTAIN PERMITS TO WORK WITHIN STATE
RIGHT-OF-WAY (VDOT LAND -USE PERMIT). BONDING FOR WORK
WITHIN THE VDOT RIGHT-OF-WAY MAY BE REQUIRED TO OBTAIN THE
PERMIT.
3. CONTRACTOR SHALL COORDINATE WITH OWNER TO OBTAIN VSMP
PERMITS, AS REQUIRED BY THE STATE DEPARTMENT OF
ENVIRONMENTAL QUALITY (DEQ).
4. CONTRACTOR SHALL OBTAIN LAND DISTURBANCE PERMIT FROM THE
COUNTY OF ALBEMARLE PRIOR TO BEGINNING CONSTRUCTION.
5. A PRE -CONSTRUCTION MEETING WITH THE ENGINEER, THE CERTIFIED
LAND DISTURBER, AND THE ENVIRONMENTAL INSPECTOR MAY ALSO
BE REQUIRED. ALLOW 72 HOURS FOR COORDINATION AND
SCHEDULING OF PRE -CONSTRUCTION MEETING.
6. AREA OF FOREST/OPEN SPACE SHALL BE DEMARCATED
(FENCED -OFF) PRIOR TO ANY LAND DISTURBING ACTIVITIES.
PROJECT DESCRIPTION
THIS PROJECT PROPOSES TO DEVELOP COMMERCIAL PROPERTY AT THE
INTERSECTION OF GEORGETOWN AND HYDRAULIC ROAD. THIS PROJECT
PROPOSES TO DISTURB A TOTAL OF 0.88 ACRES.
EXISTING SITE CONDITIONS
THE CURRENT CONDITIONS OF THIS LOT CONSISTS OF APPROXIMATELY 1
ACRE OF VACANT, GENTLE TO MODERATELY STEEP SLOPING WOODED
LAND THAT GENERALLY DRAINS DOWNGRADIENT WEST OF THE PARCEL .
ADJACENT AREAS
THE LOT IS BOUND BY A MIX OF COMMERCIAL AND RESIDENTIAL
PROPERTIES THAT RUN ALONG PUBLIC RIGHT OF WAY.
OFF -SITE AREAS
ANY EXCESS MATERIAL GENERATED AS PART OF THIS PROJECT SHALL BE
STORED OR SPREAD WITHIN THE APPROVED LAND DISTURBANCE AREA OR
IN AN AREA APPROVED BY THE COUNTY OF ALBEMARLE.
SOILS
65B-PACOLET SANDY LOAM - 2 TO 7 PERCENT SLOPES
HYDROLOGIC SOIL GROUP B. DEEP, WELL -DRAINED SOIL. MEDIUM CLASS
RUNOFF WITH LAYERS CONSISTING OF SANDY LOAM, CLAY, AND SANDY
CLAY LOAM. LOW FREQUENCY OF FLOODING AND PONDING WITH MODERATE
EROSION.
CRITICAL AREAS
CRITICAL AREAS WITHIN THE DEVELOPMENT INCLUDE THE
CRITICAL SLOPES THAT RUN CENTRALIZED THROUGH THE
PARCEL. EXTREME CAUTION SHALL BE USED WHEN GRADING
THESE CRITICAL AREAS TO AVOID EXCESSIVE DOWNSTREAM
EROSION.
STRUCTURAL PRACTICES
1. TEMPORARY CONSTRUCTION ENTRANCE (3.02) - A TEMPORARY
CONSTRUCTION ENTRANCE SHALL BE INSTALLED AT SITE ENTRANCE
OFF OF MIDWAY LANE ROAD.
2. ROAD STABILIZATION (3.031 - ACCESS ROADS, PARKING AREAS, AND
OTHER ON -SITE VEHICLE TRANSPORTATION ROUTES SHALL BE
STABILIZED WITH STONE IMMEDIATELY AFTER GRADING.
3. SILT FENCE BARRIER (3.05) - SILT FENCE BARRIERS WILL BE
INSTALLED TO FILTER RUNOFF FROM SHEET FLOW AS INDICATED ON
THE EROSION AND SEDIMENT CONTROL PLAN.
VEGETATIVE PRACTICES
1. SURFACE ROUGHENING (3.291 - ALL AREAS WITH A GRADE STEEPER
THAN 3:1 SHALL BE STAIR -STEP GRADED OR GROOVED (PLATE
3,29-4) TO AID IN GRASS ESTABLISHMENT, INCREASE INFILTRATION,
AND TO SLOW RUNOFF VELOCITIES.
2. TOPSOILING & STOCKPILING (3.30) - TOPSOIL WILL BE STRIPPED
FROM AREAS TO BE GRADED AND STOCKPILED FOR LATER USE.
STOCKPILES ARE TO BE STABILIZED WITH TEMPORARY VEGETATION
OR TO HAVE SILT FENCE INSTALLED ALONG THE LOWER PERIMETER
TO PROTECT DOWNSTREAM AREAS.
3. TEMPORARY SEEDING (3.31) - AREAS NOT BROUGHT TO FINAL
GRADE FOR A PERIOD OF MORE THAN 14 DAYS SHALL BE
STABILIZED WITH A TEMPORARY SEED MIXTURE ACCEPTABLE FOR
THAT TIME OF YEAR. CRIMPING, PUNCH ROLLER -TYPE ROLLERS, OR
TRACK WALKING MAY BE USED TO INCORPORATE STRAW MULCH
INTO THE SOIL ON SLOPES IF STRAW IS TO BE USED.
4. PERMANENT SEEDING (3.321 - AREAS BROUGHT TO FINAL GRADE OR
THOSE CONSTRUCTION AREAS THAT WILL REMAIN DORMANT FOR
YEAR OR MORE SHALL BE STABILIZED WITH A PERMANENT SEED
MIXTURE ACCEPTABLE TO THAT TIME OF YEAR. PREPARE SURFACE
WITH APPROVED TREATMENT AND ADDITIVES PRIOR TO APPLYING
SEED.
5. MULCH (3.35) - PLANT RESIDUES OR OTHER SUITABLE MATERIALS
SHALL BE APPLIED TO DISTURBED SURFACES TO PREVENT EROSION
AND REDUCE OVERLAND FLOW VELOCITIES. THIS PRACTICE SHOULD
BE APPLIED TO ALL SEEDING OPERATIONS, OTHER PLANTER
MATERIALS WHICH DO NOT PROVIDE ADEQUATE SOIL PROTECTION BY
THEMSELVES, AND BARE AREAS WHICH CANNOT BE SEEDED DUE TO
THE SEASON BUT WHICH STILL NEED PROTECTION TO PREVENT SOIL
LOSS. CRIMPING, PUNCH ROLLER -TYPE ROLLERS, OR TRACK
WALKING MAY BE USED TO INCORPORATE STRAW MULCH INTO THE
SOIL ON SLOPES IF STRAW IS TO BE USED.
6. DUST CONTROL (3.39) - DUST CONTROL METHODS MUST BE USED
TO REDUCE THE AMOUNT OF AIRBORNE DUST DURING ALL PHASES
OF CONSTRUCTION WHERE SOIL IS EXPOSED OR DISTURBED.
MANAGEMENT STRATEGIES
1. CONSTRUCTION WILL BE SEQUENCED SO THAT GRADING OPERATIONS
CAN BEGIN AND END AS QUICKLY AS POSSIBLE.
2. THE CONSTRUCTION ENTRANCE AND PERIMETER EROSION CONTROL
MEASURES SUCH AS TREE PROTECTION AND SILT FENCE SHALL BE
INSTALLED AS THE FIRST STEP OF DISTURBANCE.
3. SEDIMENT BASIN MEASURES SHALL BE INSTALLED WITH PERIMETER
SILT FENCE PRIOR TO ANY GRADING AND SHALL BE SEEDED AND
MULCHED IMMEDIATELY FOLLOWING INSTALLATION.
4. THE SEDIMENT BASIN SHALL BE CHECKED FOR SEDIMENT
ACCUMULATION AFTER EVERY RUNOFF PRODUCING STORM EVENT.
SEDIMENT SHOULD BE REMOVED WHEN IT REACHES ONE-HALF OF
THE DESIGN VOLUME OF THE WET STORAGE.
5. TEMPORARY SEEDING OR OTHER STABILIZATION METHODS, SUCH AS
BASE AGGREGATE WILL FOLLOW IMMEDIATELY AFTER REACHING FINAL
GRADES.
6. ALL SEEDED AREAS WILL BE CHECKED REGULARLY TO ENSURE THAT
RE -SEEDED AS NEEDED TO ESTABLISH GROWTH.
7. THE JOB SUPERINTENDENT SHALL BE RESPONSIBLE FOR THE
INSTALLATION AND MAINTENANCE OF ALL EROSION AND SEDIMENT
CONTROL PRACTICES.
8. DURING FINE GRADING OPERATIONS, MAINTAIN ALL DIVERSION
DITCHES TO THE SEDIMENT TRAP. THE SEDIMENT TRAP SHALL
REMAIN FUNCTIONAL THROUGHOUT CONSTRUCTION.
AFTER BEING NOTIFIED BY THE EROSION AND SEDIMENT CONTROL
ADMINISTRATOR, THE TEMPORARY EROSION AND SEDIMENT CONTROLS
CAN BE CLEANED UP OR REMOVED, AND THE SEDIMENT TRAP CAN BE
FILLED IN AND SEEDED FOR SITE STABILIZATION.
PERMANENT STABILIZATION
ALL AREAS DISTURBED BY CONSTRUCTION SHALL BE STABILIZED WITH
STRAW & SEED IMMEDIATELY FOLLOWING FINISHED GRADE. SEEDING
SHALL BE DONE WITH KENTUCKY 31 TALL FESCUE IN ACCORDANCE TO
STANDARD AND SPECIFICATION 3.32, PERMANENT SEEDING, OF THE
VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK. ANY FERTILIZER
AND LIME APPLICATIONS SHALL BE IN ACCORDANCE WITH SOIL TEST
RESULTS. ALL SEEDED AREAS WILL BE STRAW MULCHED TO PROTECT
AGAINST RILL EROSION AND TO PRESERVE SOIL MOISTURE THAT WILL
ENHANCE SEED GERMINATION. CRIMPING, PUNCH ROLLER -TYPE ROLLERS,
OR TRACK WALKING MAY BE USED TO INCORPORATE STRAW MULCH INTO
THE SOIL ON SLOPES IF STRAW IS TO BE USED.
EROSION CONTROL MAINTENANCE
1. IN GENERAL, ALL EROSION AND SEDIMENT CONTROL MEASURES
SHALL BE CHECKED DAILY AND AFTER EACH SIGNIFICANT RAINFALL.
THE FOLLOWING ITEMS WILL BE CHECKED IN PARTICULAR:
2. THE CONSTRUCTION ENTRANCE SHALL BE CHECKED DAILY FOR SOIL
BUILDUP. IF THE ENTRANCE BECOMES CLOGGED WITH SOIL AND FAILS
TO PREVENT THE TRANSPORTATION OF SOIL ONTO THE ROADWAY,
ADDITIONAL STONE, REPLACEMENT OF STONE, OR A WASH -RACK
MAY BE REQUIRED.
3. SILT FENCE SHALL BE INSPECTED IMMEDIATELY AFTER EACH
RAINFALL AND AT LEAST DAILY DURING PROLONGED RAINFALL.
CLOSE ATTENTION SHALL BE PAID TO THE REPAIR OF DAMAGED SILT
FENCE RESULTING FROM END RUNS AND UNDERCUTTING. SHOULD
THE FABRIC ON A SILT FENCE DECOMPOSE OR BECOME INEFFECTIVE
PRIOR TO THE END OF THE EXPECTED USABLE LIFE AND THE
BARRIER STILL BE NECESSARY, THE FABRIC SHALL BE REPLACED
PROMPTLY. SEDIMENT DEPOSITS SHOULD BE REMOVED AFTER EACH
STORM EVENT. THEY MUST BE REMOVED WHEN DEPOSITS REACH
APPROXIMATELY ONE-HALF THE HEIGHT OF THE BARRIER. ANY
SEDIMENT DEPOSITS REMAINING IN PLACE AFTER THE SILT FENCE IS
NO LONGER REQUIRED SHALL BE DRESSED TO CONFORM WITH THE
EXISTING GRADE, PREPARED, AND SEEDED.
4. DIVERSION DIKES SHALL BE INSPECTED AFTER EVERY STORM AND
REPAIRS MADE TO THE DIKE, FLOW CHANNEL, OUTLET, OR SEDIMENT
TRAPPING FACILITY AS NECESSARY. ONCE EVERY TWO WEEKS,
WHETHER A STORM EVENT HAS OCCURRED OR NOT, THE MEASURE
SHALL BE INSPECTED AND REPAIRS MADE IF NEEDED. DAMAGES
CAUSED BY CONSTRUCTION TRAFFIC OR OTHER ACTIVITY MUST BE
REPAIRED BEFORE THE END OF EACH WORKING DAY.
5. STORMWATER CONVEYANCE CHANNELS (WHERE APPLICABLE):
5.1. GRASS LINED CHANNELS - DURING THE INITIAL ESTABLISHMENT,
GRASS LINED CHANNELS SHOULD BE REPAIRED IMMEDIATELY
AND RE-ESTABLISHED IF NECESSARY. AFTER GRASS HAS
BECOME ESTABLISHED, THE CHANNEL SHOULD BE CHECKED
PERIODICALLY TO DETERMINE IF THE GRASS IS WITHSTANDING
FLOW VELOCITIES WITHOUT DAMAGE. IF THE CHANNEL IS TO BE
MOWED, IT SHOULD BE DONE IN A MANNER THAT IT WILL NOT
DAMAGE THE GRASS.
5.2. RIPRAP-LINED CHANNELS - RIPRAP LINED CHANNELS SHOULD
BE CHECKED PERIODICALLY TO ENSURE THE SCOUR IS NOT
OCCURRING BENEATH FABRIC UNDERLINING OF THE RIPRAP
LAYER. THE CHANNEL SHOULD ALSO BE CHECKED TO
DETERMINE THE STONES ARE NOT DISLODGED BY LARGE
FLOWS.
5.3. IF SEDIMENT IS DEPOSITED IN A GRASS -LINED CHANNEL, IT
SHOULD BE REMOVED PROMPTLY TO PREVENT DAMAGE TO THE
GRASS. SEDIMENT DEPOSITED IN A RIPRAP CHANNEL SHOULD
BE REMOVED WHEN IT REDUCES THE CAPACITY OF THE
CHANNEL.
6. CHECK DAMS (WHERE APPLICABLE): SHALL BE CHECKED FOR
SEDIMENT ACCUMULATION AFTER EVERY RUNOFF PRODUCING STORM
EVENT. SEDIMENT SHOULD BE REMOVED WHEN IT REACHES
ONE-HALF OF THE ORIGINAL HEIGHT OF THE MEASURE. REGULAR
INSPECTIONS SHALL BE MADE TO INSURE THE CENTER OF EACH DAM
IS LOWER THAN THE EDGES. EROSION CAUSED BY HIGH FLOWS
AROUND THE EDGES OF THE DAM SHOULD BE CORRECTED
IMMEDIATELY.
7. THE EARTHEN EMBANKMENTS SHALL BE CHECKED REGULARLY TO
ENSURE THAT IT IS STRUCTURALLY SOUND AND HAS NOT BEEN
DAMAGED BY EROSION OR CONSTRUCTION EQUIPMENT.
8. THE STORMWATER MANAGEMENT FACILITIES SHOULD BE CHECKED
REGULARLY BY THE HOMEOWNERS ASSOCIATIONS TO ENSURE THAT
THEY ARE STRUCTURALLY SOUND AND HAVE NOT BEEN DAMAGED
BY EROSION.
9. THE EMERGENCY SPILLWAY SHALL BE CHECKED REGULARLY TO
ENSURE THAT ITS LINING IS WELL ESTABLISHED AND EROSION
RESISTANT. GRASS SHALL BE KEPT MOWN BELOW A HEIGHT OF 15"
AND THE OUTLET SHOULD BE CHECKED FOR CLOGGING.
10. THE DAM SECTION SHALL BE KEPT FREE OF SAPLINGS OR
TREES.(REFER TO THE ADDITIONAL MAINTENANCE SPECIFICATIONS)
11. ALL SEEDED AREAS WILL BE CHECKED REGULARLY TO ENSURE THAT
A GOOD STAND IS MAINTAINED. AREAS SHOULD BE FERTILIZED AND
RE -SEEDED AS NEEDED. IN THE EVENT THAT THE APPLIED SEEDING
FAILS TO TAKE HOLD, BLANKET MATTING SHALL BE PLACED IN
APPROPRIATE AREAS DEEMED NECESSARY BY THE ENGINEER OR
EROSION CONTROL INSPECTOR.
SEQUENCE OF CONSTRUCTION
1. AFTER OBTAINING ALL REQUIRED PERMITS THE CONTRACTOR SHALL
COORDINATE A PRE -CONSTRUCTION MEETING, ALLOWING 72 HOURS
FOR ITS COORDINATION.
2. INSTALL CONSTRUCTION ENTRANCE OFF OF MIDWAY LANE ROAD.
2.1. SHOULD THE TEMPORARY CONSTRUCTION ENTRANCE OFF OF
MIDWAY LANE ROAD NOT BE MAINTAINED PROPERLY OR AN
EXCESSIVE AMOUNT OF SOIL FOUND TRACKED ONTO THE PUBLIC
ROADWAY, THEN A PAVED CONSTRUCTION ENTRANCE, WATER
TANKER TRUCK WITH TWO (2) PRESSURE WASHERS AND A
SETTLING AREA MAY BE REQUIRED BY THE EROSION AND
SEDIMENT CONTROL PROGRAM ADMINISTRATOR.
3. CLEARING AND GRUBBING SHALL FIRST BE LIMITED TO THAT
NECESSARY TO INSTALL SILT FENCE AND OTHER PERIMETER
PRIOR TO ANY UPSLOPE LAND DISTURBANCE THAT TAKES PLACE.
3.1. SILT FENCE SHALL BE INSTALLED ON THE DOWNHILL SIDE OF
THE ACTIVE GRADING OPERATIONS.
4. PRIOR TO ADDITIONAL CLEARING AND GRUBBING, THE CONTRACTOR
SHALL COORDINATE INSPECTIONS, AS REQUIRED BY THE COUNTY OF
ALBEMARLE.
5. CLEAR AND GRUB THE REMAINDER OF PROJECT AREA.
5.1. THE LAND DISTURBANCE SHALL BE RESTRICTED TO THE LIMITS
OF DISTURBANCE SHOWN IN THE APPROVED EROSION CONTROL
PLANS.
5.2. THESE LIMITS ARE CONFINED TO THE PROPERTY BOUNDARIES
SHOWN HEREON THIS PLAN.
6. STOCKPILE TOPSOIL WITHIN AN AREA ON THE PROPERTY OR A
LOCATION APPROVED BY ALBEMARLE COUNTY. INSTALL SILT FENCE
AT THE PERIMETER OF STOCKPILES) AS NECESSARY.
7. DENUDED AREAS SHALL DRAIN TO AN APPROVED EROSION CONTROL
MEASURE AT ALL TIMES DURING CONSTRUCTION.
8. PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED
TO ALL 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 30 DAYS. PERMANENT STABILIZATION
SHALL BE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR
MORE THAN ONE YEAR.
9. LIME, FERTILIZE AND APPLY TEMPORARY OR PERMANENT SEEDING TO
ALL DENUDED AREAS IMMEDIATELY AFTER ACHIEVING FINAL GRADES.
10. ALL PERMANENT SLOPES STEEPER THAN 3:1 SHALL RECEIVE
STABILIZATION WITH LANDSCAPING VEGETATION HARDIER THAN
GRASS, WHICH WILL NOT REQUIRE MOWING.
11. AFTER PROPOSED CONSTRUCTION IS COMPLETED AND THE SITE IS
COMPLETELY STABILIZED, PERMISSION IS TO BE OBTAINED FROM THE
EROSION CONTROL INSPECTOR FOR THE REMOVAL OF SILT FENCING
AND OTHER REMAINING TEMPORARY EROSION CONTROL MEASURES.
EROSION AND SEDIMENT CONTROL 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.
CONTRACTOR SHALL ESTABLISH A STABILIZED SITE, AND NOT ALLOW ANY
SEDIMENT TO EXIT THE PROJECT LIMITS.
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.
CONTRACTOR TO PROTECT STOCKPILE AREAS WITH SILT FENCE.
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.
CONTRACTOR SHALL ESTABLISH A VEGETATIVE COVER ON ALL DENUDED
AREAS.
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.
CONTRACTOR SHALL ESTABLISH THE PERIMETER CONTROLS OF SUPER SILT
FENCE AS THE FIRST STEP OF THE LANDS DISTURBANCE FOR THIS
PROJECT.
5. STABILIZATION MEASURES SHALL BE APPLIED TO EARTHEN
STRUCTURES SUCH AS DAMS, DIKES AND DIVERSIONS IMMEDIATELY
AFTER INSTALLATION.
CONTRACTOR SHALL INSPECT EROSION CONTROL MEASURES AFTER EACH
RAINFALL EVENT.
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.
THERE IS ONE PROPOSED SEDIMENT 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. THERE
ARE NO PROPOSED CUT OR FILL SLOPES. HOWEVER, THE
CONTRACTOR IS TO RESTORE THE PROJECT AREA TO EXISTING
GRADE. IF THE AREAS WITH NATURALLY STEEP SLOPES ARE FOUND
TO BE ERODING EXCESSIVELY AFTER ONE YEAR, CONTRACTOR IS TO
PROVIDE 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. MAXIMIZE
SHEETFLOW AND GROUNDWATER INFILTRATION
9. WHENEVER WATER SEEPS FROM A SLOPE FACE, ADEQUATE DRAINAGE
OR OTHER PROTECTION SHALL BE PROVIDED. CONTRACTOR TO NOTIFY
ENGINEER AND COUNTY EROSION CONTROL INSPECTOR.
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.THERE ARE NO STORM SEWER INLETS PROPOSED.
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.THERE ARE NO STORMWATER CONVEYANCE
CHANNELS OR PIPES PROPOSED.
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. NON -ERODIBLE MATERIAL
SHALL BE USED FOR THE CONSTRUCTION OF CAUSEWAYS AND
COFFERDAMS. EARTHEN FILL MAY BE USED FOR THESE STRUCTURES
IF ARMORED BY NON -ERODIBLE COVER MATERIALS. CON TRACTOR
SHALL FOLLOW THE VESCH CHAPTER 3.25 UTILITY STREAM CROSSING
REQUIREMENTS FOR THE TWO INTERMITTENT STREAM CROSSINGS.
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
NON -ERODIBLE MATERIAL SHALL BE PROVIDED. CONTRACTOR SHALL
FOLLOW THE VESCH CHAPTER 3.25 UTILITY STREAM CROSSING
REQUIREMENTS FOR THE TWO INTERMITTENT STREAM CROSSINGS.
14. ALL APPLICABLE FEDERAL, STATE AND LOCAL REQUIREMENTS
PERTAINING TO WORKING IN OR CROSSING LIVE WATERCOURSES
SHALL BE MET.CONTRACTOR SHALL FOLLOW FOLLOW ALL
APPLICABLE FEDERAL, STATE AND LOCAL REQUIREMENTS FOR THE
TWO INTERMITTENT STREAM CROSSINGS.
15. THE BED AND BANKS OF A WATERCOURSE SHALL BE STABILIZED
IMMEDIATELY AFTER WORK IN THE WATERCOURSE IS
COMPLETED. CONTRACTOR SHALL FOLLOW THE VESCH CHAPTER 3.25
UTILITY STREAM CROSSING REQUIREMENTS FOR THE TWO
INTERMITTENT STREAM CROSSINGS.
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. RE -STABILIZATION SHALL BE ACCOMPLISHED IN ACCORDANCE WITH
THIS CHAPTER.
F. APPLICABLE SAFETY REQUIREMENTS SHALL BE COMPLIED
WITH.CONTRACTOR TO ADHERE TO THE APPLICABLE STANDARD FOR
PRIVATE AND PUBLIC UTILITY INSTALLATION.
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.CONTRACTOR SHALL MAKE PROVISIONS TO KEEP
ADJACENT ROADS CLEAN FROM SOIL BUILD-UP.
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
SEDIMEN TATION. CONTRACTOR SHALL STABILIZE SITE, AND OBTAIN
INSPECTOR APPROVAL PRIOR TO REMOVING EC MEASURES. UPON
APPROVAL OF THE ENVIRONMENTAL INSPECTOR, INSTALL
INFILTRATION AREAS AND CONNECT ROOF DRAINS.
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: THIS
PROJECT DOES NOT INCLUDE ANY ADDITIONAL IMPERVIOUS SURFACES
AND THE PROJECT AREA WILL BE RESTORED TO ITS EXISTING
CONIDTIONS. THEREFORE WILL NOT PRODUCE ANY ADDITIONAL
STORMWATER RUNOFF.
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 USING
THE VSMP CHANNEL PROTECTION CRITERIA. STORMWATER DISCHARGES
ARE CLASSIFIED INTO ONE OF THREE TYPES OF CHANNEL.
(1) "MANMADE STORMWATER CONVEYANCE SYSTEM" MEANS A
PIPE, DITCH, VEGETATED SWALE, OR OTHER STORMWATER
CONVEYANCE SYSTEM CONSTRUCTED BY MAN EXCEPT FOR
RESTORED STORMWATER CONVEYANCE SYSTEMS OR,
(A) THE MANMADE STORMWATER CONVEYANCE SYSTEM SHALL
CONVEY THE POST -DEVELOPMENT PEAK FLOW RATE FROM
THE TWO-YEAR EVENT WITHOUT CAUSING EROSION OF THE
SYSTEM DETENTION OF THE STORMWATER OR DOWNSTREAM
IMPROVEMENTS MAY BE INCORPORATED INTO THE APPROVED
LAND -DISTURBING ACTIVITY TO MEET THIS CRITERIA AT THE
DISCRETION OF THE STORMWATER PROGRAM ADMINISTRATIVE
AUTHORITY.
(B) THE PEAK DISCHARGE REQUIREMENTS FOR CONCENTRATED
STORMWATER FLOW TO NATURAL STORMWATER CONVEYANCE
SYSTEMS SHALL BE MET.
QDEVELOPED <= I.F. * (QPRE-DEV. * RVPRE-DEV.) /
RVDEVELOPED
UNDER NO CONDITION SHALL QDEVELOPED > Q PRE-DEV.
NOR SHALL QDEVELOPED BE REQUIRED TO BE LESS THAN
THAT
QFOREST * RVPRE-DEV.)/RVDEVELOPED
OR IN ACCORDANCE WITH ANOTHER METHODOLOGY THAT IS
DEMONSTRATED BY THE VSMP AUTHORITY TO ACHIEVE
EQUIVALENT RESULTS AND IS APPROVED BY THE BOARD.
(2) "NATURAL STORMWATER CONVEYANCE SYSTEM MEANS THE
MAIN CHANNEL OF A NATURAL STREAM AND THE
FLOOD -PRONE AREA ADJACENT TO THE MAIN CHANNEL OR,
(3) "RESTORED STORMWATER CONVEYANCE SYSTEM" MEANS A
STORMWATER CONVEYANCE SYSTEM THAT HAS BEEN DESIGNED
AND CONSTRUCTED USING NATURAL CHANNEL DESIGN
CONCEPTS. RESTORED STORMWATER CONVEYANCE SYSTEMS
INCLUDE THE MAIN CHANNEL AND THE FLOOD -PRONE AREA
ADJACENT TO THE MAIN CHANNEL.
(A) THE DEVELOPMENT SHALL BE CONSISTENT, IN COMBINATION
WITH OTHER STORMWATER RUNOFF, WITH THE DESIGN
PARAMETERS OF THE RESTORED STORMWATER CONVEYANCE
SYSTEM THAT IS FUNCTIONING IN ACCORDANCE WITH THE
DESIGN OBJECTIVES.
(B) THE PEAK DISCHARGE REQUIREMENTS FOR CONCENTRATED
STORMWATER FLOW TO NATURAL STORMWATER CONVEYANCE
SYSTEMS SHALL BE MET. SEE 19(B)(1)(B).
011 LT, P EMMIM161
CC 3.02 o PAVED CONSTRUCTION
ENTRANCE
s F 3.05 X SILT FENCE
OP 3.18 o OUTLET PROTECTION
TS 3.31 TS TEMPORARY SEEDING
P S 3.32 PS PERMANENT SEEDING
TP 3.38 rR TREE PROTECTION
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SHEET;
OF 9
sF SILT FENCE
(WITHOUT WIRE S UPPOR T)
1. SET THE STAKES. 2. EXCAVATE A 4"X 4" TRENCH
UPSLOPE ALONG THE LINE OF
STAKES.
6'MAX.
FL_ / -
// Ill � I„•III -- I....
4»
3. STAPLE FILTER MATERIAL 4. BACKFILL AND COMPACT
TO STAKES AND EXTEND THE EXCAVATED SOIL.
IT INTO THE TRENCH.
✓ � Jill III
SHEET FLOW INSTALLATION
(PERSPECTIVE VIEW)
FLOW FLOW
A A
SILT FENCE
L
III-III=III-III-1 � l-1 �!;, I� I
SF/STONE NOT REQUIRED AFTER SLOPES ARE STABILIZED DOWNSLOPE OF OUTFALL
POINTS A SHOULD BE HIGHER THAN POINT B.
DRAINAGEWAY INSTALLATION
(FRONT ELEVATION)
SOURCE: Adapted from Installation of Straw and Fabric Filter Barriers for Sediment Control,VA. DSWC PLATE. 3.05-2
Sherwood and Wyant
R0,
INLET PROTECTION
BLOCK l GRAVEL I'•' INLET
CONCRETESEDIMENT FIL TER
WIRE SCREEN •
fA
RUNOFF -
WATER
WITH
SEDIMENT
SEDIM
OVERFLOi
SPECIFIC APPLICATION
THIS METHOD OF INLET PROTECTION IS APPLICABLE WHERE
HEAVY FLOWS ARE EXPECTED AND WHERE AN OVERFLOW
CAPACITY IS NECESSARY TO PREVENT EXCESSIVE PONDING
AROUND THE STRUCTURE.
* GRAVEL SHALL BE VDOT #3, #357 OR #5 COARSE AGGREGATE.
SOURCE: VA. DSWC
PLATE. 3.07-3
TEMPORARY SEEDING MIXTURES
FOR THE PIEDMONT AREA
TABLE 26
TEMPORARY SEEDINGS BY RATES, DEPTHS, AND DATES
Seeding Rate
Planting
depth �
Seedingzones 37 and Seeding Date 38
9
Species,[
Per
Lbs/1000
7a and 7b
6b
6a and 5b
acre
Sq. ft
(Inches)
2/1-
5/1-
8/15-
3/1-
5/1-
8/15-
3/15-
6/1-
8/1-
4/30
8/14
11/30
4/30
8/14
11/15
5/31
7/31
10/31
Choose one:
BY
BY
BY
Barley
2.5 bu.
2.80
1-2
X
-
10/15
X
-
10/15
X
-
10/1
Oats
3 bu.
2.21
1-2
X
-
-
X
-
-
X
-
-
Rye_�22/
2.5 bu.
3.22
1-2
X
-
X
X
-
X
X
-
X
Barley or
Rye Plus
150 lbs.
3.45
1
X
X
10/15
X
X
10/15
X
X
10/1
Foxtail
X
X
X
X
X
X
X
X
X
millet40
Weeping
lovegross4l
4 lbs.
0.09
1/4-1/2
-
X
-
-
X
-
-
X
-
Annual
ryegrasS
50 lbs.
1.15
1/4-1/2
X
-
11/1
X
-
11/1
X
-
8/15
MilletAv
50 lbs.
1.15
1/2
-
X
-
-
X
-
-
X
-
2nZ Applicable on slopes of 3:1 or flatter
3V Refer to figure A - Adopted from USDA, ARS Miscellaneous Publication #1475, January 1990
3BZ Between fall and spring seeding dates, use mulch only if ground is frozen and reseed when thawed
May be used as a nurse crop for late fall/early winter permanent seedings, add 56 Ibs/ac.
to the permanent seeding mixture
40 Maryland State Highway Administration Temporary Seed Mix
4V
May be used as a nurse crop for mid -summer permanent seedings. Add 2 Ibs/ac
41 to permanent seed mix.
May be used as a nurse crop for mid -summer permanent seedings. Add 10 Ibs/ac.
42 to the permanent seeding mix.
INFORMATION FROM TABLE 3.32-C OF THE VA ESC HANDBOOK
IS PROVIDED BELOW FOR SEEDING SELECTION
TOTAL LBS. PER ACRE
MINIMUM CARE LAWN 200-250 LBS
-COMMERCIAL OR RESIDENTIAL
90-100%
KENTUCKY 31 OR TURF -TYPE TALL FESCUE 0-10%
IMPROVED PERENNIAL RYEGRASS 0-10%
KENTUCKY BLUEGRASS
GENERAL SLOPE (3:1 OR LESS) 128 LBS
KENTUCKY 31 FESCUE 2 LBS
RED TOP GRASS 20 LBS
SAEASONAL NURSE CROP **
** USE SEASONAL NURSE CROP IN ACCORDANCE WITH SEEDING DATES AS STATED BELOW:
MARCH, APRIL THROUGH MAY 15TH ANNUAL RYE
MAY 16TH THROUGH AUGUST 15TH FOXTAIL MILLET
AUGUST 16TH THROUGH SEPTEMBER, OCTOBER ANNUAL RYE
NOVEMBER THROUGH FEBRUARY WINTER RYE
FERTILIZER (10-20-10 OR EQ) SHALL BE APPLIED AT THE RATE OF 1000 LBS/ ACRE.
AGRICULTURAL LIME SHALL BE APPLIED TO SEEDBEDS AT TTHE RATE OF 90 LBS/ 1000 SQ. FT.
SUGGESTED TEMPORARY SEEDING MIXTURE
FERTILIZER: 10-20-10 1,000 LBS/ACRE
SEPTEMBER-FEBRUARY 15: 50% ANNUAL RYE & 50% WINTER RYE 100 LBS/ACRE
FEBRUARY 16-APRIL 30: ANNUAL RYE 100 LBS/ACRE
MAY -AUGUST: GERMAN MILLET 50 LBS/ACRE
OTHER OPTIONS EXIST, SEE VA EROSION AND SEDIMENT CONTROL HANDBOOK.
SUGGESTED PERMANENT SEEDING MIXTURE
LIME: 2 TONS/ACRE
FERTILIZER: 10-20-10 1,000 LBS/ACRE
MARCH -MAY 15: KENTUCKY 31 FESCUE 200 LBS/ACRE, ANNUAL RYE 20 LBS/ACRE
MAY 16-AUGUST 15: KENTUCKY 31 FESCUE 200 LBS/ACRE, FOXTAIL MILLET 20 LBS ACRE
AUGUST 16-OCTOBER: KENTUCKY 31 FESCUE 200 LBS/ACRE, ANNUAL RYE 20 LBS/ACRE
NOVEMBER-FEBRUARY: KENTUCKY 31 FESCUE 200 LBS/ACRE, WINTER RYE 20 LBS/ACRE
STONE
CaNSTrRUCTION-
ACCESS -\
r
STONE
CONSTRUCTION
ACCESS -\
70` MIN.
3" SM-2A ASPHALT TOP
COURSE
2% 2%
�:.5.-0
6" MIN. 21A AGGREGATE BASE
PROFILE
0
-ASPHALT PAVED
VIASHRACK
EXISTING
PAVEMENT
' I
r EXISTING
2% 2% PAVEMEl
*MUST EXTEND FULL WIDTH L A I POSITIVE DRAINAGE
OF INGRESS AND EGRESS � � TO EOIMENT
OPERATION i �rRAPPING DEVICE
PLAN
--_-'12' MIN. POSITIVE DRAINAGE
2/ TO SEDIMENT
1'rmpOiNG
DEVICE
FILTER CLOTH-N•�"`
SECTION A -A
A iuillinluur water tap of 1 inch inust be installed with a ininfinuin 1 itich ballcock
shutoff cfahre supplyilig, a wash hose with a diallleter of 1.5 inches for adequate
constant pressure Wash Water inust be carried away from the entrance to all
approVect settW>, area to cell ove se(luilent. all sedisnelI tshaff be prevented from
enteritig storm drains, ditches of Watercourses.
RAVED WASH RACK
NO SCALE
PERMANENT SEEDING MIXTURES
Ps FOR THE PIEDMONT AREA
TABLE 25 TOTAL LBS. PER ACRE
MINIMUM CARE LAWN - COMMERCIAL OR RESIDENTIAL 175-200 LBS.
- KENTUCKY 31 OR TURF -TYPE TALL FESCUE %95-100%
- IMPROVED PERENNIAL RYE GRASS 0-5%
- KENTUCKY BLUEGRASS 0-5%
oP OUTLET PROTECTION
PIPE OUTLET CONDITIONS
A A
SECTION A -A
'IPE OUTLET TO FLAT
.REA WITH NO DEFINED
'HANNEL
L a
0
1111 d
FILTER CLOTH KEY IN 6"-9"; RECOMMENDED FOR ENTIRE PERIMETER
I
3do (MIN.)
'IPE OUTLET TO WELL
)EFINED CHANNEL
ur.
d
SECTION A -A
FILTER CLOTH KEY IN 6"-9"; RECOMMENDED FOR ENTIRE PERIMETER
NOTES: 1. APRON LINING MAY BE RIPRAP, GROUTED RIPRAP, GABION
BASKET, OR CONCRETE.
2. La IS THE, LENGTH OF THE RIPRAP APRON AS CALCULATED
USING PLATES 3.18-3 AND 3.18-4.
3. d = 1.5 TIMES THE MAXIMUM STONE DIAMETER, BUT NOT
LESS THAN 6 INCHES.
Source: Va. DSWC
HIGH MAINTENANCE LAWN
200-250 LBS.
- KENTUCKY 31 OR TURF -TYPE TALL FESCUE
100%
GENERAL SLOPE (3:1 OR
LESS)
- KENTUCKY 31 FESCUE
128 LBS.
- RED TOP GRASS
2 LBS.
- SEASONAL NURSE CROP*
20 LBS.
TOTAL 150 LBS.
LOW -MAINTENANCE SLOPE (STEEPER THAN 3:1)
- KENTUCKY 31 FESCUE
108 LBS.
- RED TOP GRASS
2 LBS.
- SEASONAL NURSE CROP*
20 LBS.
- CROWN VETCH**
20 LBS.
TOTAL 150 LBS.
*USE SEASONAL NURSE CROP IN ACCORDANCE WITH
SEEDING DATES AS STATED BELOW:
FEBRUARY 16TH THROUGH APRIL 30TH. . .
. . . . . . . . . ANNUAL RYE
MAY 1ST THROUGH AUGUST 15TH . . . . .
. . . . . . . . . FOXTAIL MILLET
AUGUST 16TH THROUGH OCTOBER 31 ST. .
. . . . . . . . . .ANNUAL RYE
NOVEMBER 1ST THROUGH FEBRUARY 15TH
. . . . . . . . . . ANNUAL 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 INNOCULATED.
WEEPING LOVEGRASS MAY BE ADDED
TO ANY SLOPE OR LOW MAINTENANCE MIX DURING
WARMER SEEDING PERIODS; ADD 10-
20 LBS./ACRE IN MIXES.
Plate 3.18-1
OPs PERMANENT SEEDING
FERTILIZATION &MAINTENANCE
TABLE 24
Maintenance Fertilization for Permanent Seedings
Use Soil Test Recommendation or Rates Shown Below
Seeding Mixture
Formulation
Lbs. per
Lbs. per
Time
Mowing
Acre
1000 sf
Tail fescue makes
10-10-10
500
11.5
Yearly, or as needed
*Not closer than 3"
up 70% or more
or
if occasional mowing
of cover.
30-10-10
400
9.2
fall
Is desired.
Spring the year
Do not mow
Crownvetch
following establish -
Service lespedeza
0-20-0
400
9.2
ment and every 4-5
crownvetch
Birdsfoot trefoil
years thereafter.
Not required. not
Fairly uniform
Fall the year
closer than 4" if
stand of tall
fescue & service
5-10-10
500
11.5
following establish-
ment and ever 4-5
Y
occasional mowing is
lespedeza, or
years thereafter.
desired, and then in
fall after seed has
birdsfoot trefoil.
matured.
Not required. not
weeping lovegrass
P 9 9
Spring the year
closer than 4" if
& serice lespedeza
5-10-10
500
11.5
following establish-
occasional mowing is
fairly uniform
ment and every 3-4
desired, and fall
plant distribution
years thereafter.
after sericea has
matured.
20-10-10
250
5.8
September,
Mow no closer than
2" for red fescue
Red & chewin s
9
30 days later
fescue, Kentucky
and Ky bluegrass;
bluegrass: hard
December,
and closer than 3"
fescue mixture:
20-10-10
100
2.3
May 20-June-30,
for fescue.
if needed.
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DATE:
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SCALE:
N/A
JOB:
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FILE:
19.0125
SHEET:
6 OF 9
F,
Drainage Area A
Drainaee Area A Land Cover (acres)
A Soils
B Soils C Soils
D Sol Is Totals Land Cover Rv
Forest/Open Space (acres)
0.00
0.00
Managed Turf (acres)
0.18
0.18
0.20
Impervious Cover (acres)
070
0.70
0.95
Total 0.88
Stormwater Rest Management Practices (RR = Runoff Reduction)
Total Phosphorus Available for Removal in D.A. A (Ib/yr)I 1,W
Post Development Treatment Volume in D.A. A (ftaJ 2,545
-Select from droodown lists --
Runoff
Managed Turf' Impervious
Volumefrom
Remaining
TotalBMP
Phosphorus
Phosphorus
Untreated
Phosphorus
Rema(nirg
Runoff
Load from
Phosphorus
Downstream Practice to be
Practice
Reduction
Credit Area Cover Credit
Upstream
a j Runoff
Reduction (ft j a
Treatment
a
Removal
Upstream
Load to
Removed By
Phosphorus
Employed
Credit (%)
(acres) Area (acres)
Practice (ftr)
Volume (ft)
Volume (ft)
Efficiency (%)
Practice (lb)
Load (Ib)
i
Practices (lb)
Practice(Ib)
14. Manufactured Treatment Devices (no
14.a. Manufactured Treatment Device-
RR)
0
0
0 .I 0
0
20 I 0.00
0.00
0.00
0.00
Hydrodynamic
14.b. Manufactured Treatment Device -Filtering
0
0.50
0
0
1,724
1,724
40 0.00
1.08
0.43 0.65
0
(
0
14,c.Manufactured Treatment Device -Generic
0
0
0
20 0.00
0.00
0.00 0.00
DEQ Virginia Runoff Reduction Method New Development Compliance Spreadsheet - Version3.0
2011 BMP Standards and Specifications e2013 Draft BMP Standards and Specifications
Project Name: Georgetown Hydraulic
Date: 10/23/2019
BMP Design Sperifrcations List: 2013 Draft Stds & Specs
Site Information
Post -Development Project (Treatment Volume and Loads)
Land Cover (acres)
-- A Smi Bs�Soils - C Soils D Soils Totals
Forest/Open Space (acres) - uncisiurbed,
°°0 protected to rest/ope n space o r reforested land
Managed Turf (acres) -- dlstu rbed, gaded for
0.18
ya rds o r other to rf to be mowed/managed 0.18
Impervlous cover (acres) 0.70
0.70
0.88
Nitrogen
Nitrogen Load
Untreated
Nitrogen
Remaining
Removal
from Upstream
Nitrogen Load to
Removed By
Nitrogen Load
Efflclerlcy (%)
Practices (Ibs)
Practice (Ibs)
Practice (Ibs)
(Ibs)
0
14. Manufactured
0.00
BMP (no RR)
o.ao
0.00
0.00
0
0.00
7.74 0 DO
7.74
0
0.00
0.00 0.00
0.00
Site Results (Water Quality Compliance)
Area Checks
data input cells FOREST/OPEN SPACE (ac)
start values IMPERVIOUS COVER (ac)
con
IMPERVIOUS COVER TREATED (ac)
calculation cells MANAGED TURF AREA (ac)
MANAGED TURF AREA TREATED (ac)
AREACHECK
Constants
RunoffCoefficients Rv
Annual Rainfall (inches)
43
1A
Soils
B Soils
C SoOs
D Soils
Target Rainfall Ev"(Im")
LOD
Forest/Open Space
0.02
0.03
0.04
0.05
tmal P7 phnrue (TPI FMC (,WE)
0.26
Managed Ton
0.15
1 0.20
1 0.22
0.25
kTotal Nitrngen(TN)FMC(mg/L)
186
Impervious Cnver
1
0.95
0.95
0.95
0.95
Target TP Load (Id/acre yr)
0.41
Pj (unitless correctionfactor)
0.90
Forest/Open Space Cover (acres)
Weighted Rv (forest)
0.00
0.00
% Forest
0%
Managed Turf Cover (acres)
D.18
Weighted Rv (turf)
0.20
% Managed Turf
20%
Impervious Cover (acres)
0.70
Rv (impervious)
0.95
%Impervious
90%
Site Area(acres)
0.98
Site Rv
0.80
Treatment Volume and Nutrient Loads -
TreatmentVolume
(acre-ft)
00584
Treatment Volume (cubic feet)
2,545
TP Load (lb/yrl
1.60
TN Load (lb/yr)
11.44
Multiple Outlet Design
Outflow
Total Discharge:
Water Surface Elevation:
Tailwater Elevation:
Detention Base Elevation:
Outlet #1: MH, Drop Pipe
Riser Top Elev:
Riser Base Elev:
Riser Diameter:
Orifice Coefficient:
Weir Coefficient:
Culvert Length:
Culvert Diameter:
Culvert Invert Out:
Culvert Friction Coefficient:
Culvert Entrance Loss Coefficient:
Discharge:
Outlet #2: 01, Orifice
Shape:
Diameter:
Invert Elevation:
Coefficient:
Number of Openings:
Discharge:
Velocity:
Outlet #3: PLATE, Weir
Shape:
Crest Length:
Invert Elevation:
Coefficient:
Number of Openings:
Discharge:
Velocity:
646.0193
cfs
610.00
ft
0.00
ft
0.00
ft
602.00
ft
593.00
ft
60.00
in
0.60
3.33
20.00
ft
18.00
in
594.00
ft
0.01
0.10
37.74 cfs
Circular
3.00 in
597.10 ft
0.60
0.88 cfs
17.20 ft/s
Rectangular w/o Contracted End
5.00 ft
599.00 ft
3.33
607.44 cfs
11.04 ft/s
DA A
D.A. B
D.A. C
D.A. D
D.A. E
AREA CHECK
0.00
0.00
0.00
0.00
two
OK
0.70
0.00
0.00
0.00
0.00
OK.
0.50
CIA8
0.00
0.00
0.00
0.00
D.00
0.00
0.00
0.00
0.00 ...
0.00
0.00
_.0.00
OK.
OK.
OK.
OK.
OK.
OK.
OK.
Site Treatment Volume (ft3)�°
Runoff Reduction Volume and TP By Drainage Area
RUNOFF REDUCTION 111)[11,011 It .(*-VIT%itf')
TP LOAD AVAILABLE r0RREMOVAL (lb/yr)
TP LOADREDU(.-IIDNA(IIItVtU (Ib/yr)
TP LOAD Rf MAINING (Ib/yr)
DA A
D.A B
D.A. C
D.A. D
D.A. E
TOTAL
0
0
0
0
0
0
1,60
0,00
0.00
0.00
0.00
1.60
0,43
0.00
0.00
0.00
0.00
0.43
1.17
0.00
0.00
0.00
0.00
1.17
NITROGEN LOAD REDUI HONA(HIt VID (Ib/yr) 0.00 0.00 0.00 0.00 0.00 0.00
Total Phosphorus _
FINAL POST -DEVELOPMENT TP LOAD (Ib/yr} 1.60�..
TP LOAD REDUCTION REQUIRED (Ib/yr) 1.24
TP LOAD REDUCTION ACHIEVED (lb/yr)l 0.43
TP LOAD REMAINING (Ib/yr): 1.17
REMAINING TP LOAD REDUCTION REQUIRED (lb/yr):
Total Nitrogen (For Information Purposes)
POST -DEVELOPMENT LOAD (Ib/yr} _ 11.44
NITROGEN LOAD REDUCTION ACHIEVED (Ib/yr) 0.00
REMAINING POST -DEVELOPMENT NITROGEN LOAD (lb/yr)l 11.44
TOTAL IMPERVIOUS COVER TREATED (ac) AREA CHECK: OIL
TOTAL MANAGED TURF AREATREATED (a, RM AREA CHECK:OK.
TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (lb/yr)
TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN DA A (Ib/yr)
TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN DA A (lb/yr)
TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN DA A(Ib/yr)
TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN DA A pb/yr)
TOTAL PHOSPHORUS REMAINING AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. A (Ib/yr)
SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS
NITROGEN REMOVED WITH RUNOFF REDUCTION PRACWS IN D.A. A (Ibfyr)
NITROGEN REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN DA A (W/yr)
TOTAL NITROGEN REMOVED IN DA A (Ib/yr)
nI ITI CT CTDI I(`TI IDC F- FTnII
NOT TO SCALE
4U L-r Ur I o n
OUTLET BARREL
INV. IN=595.00
INV. OUT=594.00
:A `I.
STORMWATER DETENTION SYSTEM AND LAYOUT SHOWN
a.
IS BASED ON DESIGN/DETAILS VERIFIED AND PROVIDED
'
BY ADVANCED DRAINAGE SYSTEMS (ADS) UNDER
z N
I :"
SEPARATE PACKET. THE PROPOSED MC-3500 CHAMBER
,w�,, CL
D I- 3 B
SYSTEM CURRENTLY CONTAINS A DEQ APPROVED
PHOSPHORUS REMOVAL RATE OF 40%. THE CURRENT
w
I i
REMOVAL RATE HAS BEEN APPLIED TO THE VRRM
�7- o
Curb Inlet
Calculations
SPREADSHEET AND OFFSITE NUTRIENT CREDITS WILL BE
►-
Wmv
Location
= On grade
Compute by:
Known Q
PURCHASED TO SATISFY THE REMAINING PHOSPHORUS
= U.J
Curb Length (ft)
= 8.00
Q (cfs)
= 1.64
LOAD REDUCTION REQUIREMENT OF 0.81 LB/YR.
N w Q
cc
Throat Height (in)
= 6.00
`
w�
wM I
Grate Area (sqft)
= -0-
Highlighted
-C:) �nw
Grate Width (ft)
= -0-
Q Total (cfs)
= 1.64
-- m
Grate Length (ft)
= -0-
Q Capt (cfs)
= 1.59
w wo
:.
Q Bypass (cfs)
= 0.05
Gutter
Depth at Inlet (in)
= 4.84
Slope, Sw (ft/ft)
= 0.080
Efficiency (%)
= 97
Slope, Sx (fUft)
= 0.025
Gutter Spread (ft)
= 5.06
Local Depr (in)
= 2.00
Gutter Vel (ft/s)
= 3.81
EX
IF B �..
Gutter Width (ft)
= 2.00
Bypass Spread (ft)
= 0.83
r .
Gutter Slope (%)
= 2.50
Bypass Depth (in)
= 0.80
i
Gutter n-value
= 0.016
,
,
DI-3C.
-
0 °
Curb Inlet
Calculations
Q
Location
= Sag
Compute by:
Known Q
J
t
Curb Length (ft)
= 6.00
Q (cfs)
= 0.70
1
Throat Height (in)
= 6.00
Grate Area (sqft)
= -0-
Highlighted
`�
Grate Width (ft)
= -0-
Q Total (cfs)
= 0.70
,
Grate Length (ft)
= -0-
Q Capt (cfs)
= 0.70
Q Bypass (cfs)
= -0-
Gutter
Depth at Inlet (in)
= 4.52
i
,It I
Slope, Sw (ft/ft)
= 0.080
Efficiency (%)
= 100
(((_
11, It
Slope, Sx (fUft)
= 0.025
Gutter Spread (ft)
= 4.00
D
'
t
Local Depr (in)
= 2.00
Gutter Vel (ft/s)
= 3.81
t
t t
Gutter Width (ft)
= 2.00
Bypass Spread (ft)
= -0-
Gutter Slope (%)
= -0-
Bypass Depth (in)
= -0-
�8.d
Gutter n-value
= 0.120
f
,
f
,
' ,
I
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J
STD. MANHOLE LID
FOR ACCESS
STD. MANHOLE
STEPS
OUTLET JUNCTION BOX
9.0' H X 5.0' W
3" 0 ORIFICE ® 597.10
i
INTERNAL WEIR PLATE 4.0' H x 5.0' W
FOR OUTLET FLOW CONTROL. INV ® 599.00 _ 10 YEAR WSE=598.85
15" INFLOW HDPE PIPE FROM DETENTION CHAMBERS
1 YEAR WSE=597.46
24" DETENTION SUMP CHAMBER
, 0� ���20 40 20 60
SCALE: 1 "=20'
Detention Chambers Staae-Storaae Report
Elev(Ft)
Storage(CF)
Storage(CY)
595.000
0.000
0.000
596.000
2080.679
77.062
597.000
5271.845
195.254
598.000
8335.483
308.722
598.750
9719.302
359.974
Storage(Acre-Ft)
0.000
0.048
0.121
0.191
0.223
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DRAWN BY:
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'CHECKED BY:
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Jimmy L. Taggart
Lic. No.
2841
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DATE:
OCTOBER 25 2019
SCALE:
1 "=20'
JOB:
GTH
FILE:
19.0125
SHEET:
7 OF 9
\
1
r
Drainage Area A
ASoils BSoils CSolis DSolis
TntalArea(auesl'' 088
,
PRE -DEVELOPMENT
Forest/Open Space - undisturbed, protected
Area (acres)
4.
,�U�,��O'§�, �-y},Q7}„�q'�s
forest/open space or reforested land
N C
30 55 ..70 77
Volu e Q ,
SITE
AREA
= 0.8 8
A C
Managed Turf - disturbed, graded for yards or other
turf to be mowed/managed
Area (acres)`
CN
19 61 74 80
Impervious Cover
Area acres
T R 5 5
Tc -
8.0
MIN
CN
95:' 98 ... -.. 98 98
`N(59A.A)
: - r;
1-year storm 2 year storm 10 year storm
RVDeveloP ed (watershed -inch) with no Runoff Reduction* ,fix.{ Q 32 y 1111, q 7s$ 1� 1 j * z ,�
RVDeveloped(waters)
hed-loch with Runoff Reduction* � 32 �'�'�+' 0 7 � a
Y Y L\ r Q.. `� b Y sx
I r
Adjusted CN*
EXISTING \ 1 p_ L -� 1 �I t
4 WOODS \ I
Y 0.73AC 1 \ I
1 i f I W1
EXISTING
NIMPERVIOUS
0.07AC ''` ..._ 1 ' I I { r
\ TMP 60E-1 WTI
DYNAMIC INVESTMENT I I
CAPITAL ENTERPRISES
ZONED: C 1
\ ' USE: QFFICE BUILDING
- EXISTING- IF B1
TURF ``� ' I O�Zg � f
0.08AC EX ''®® I
///
` tj / S �/ \ Ili vr00 ® v w �y / Y/ /y / w t t
20//GJ$ �j� /�/ re/° ® ' 11, Y w / w , qQt
;16�SS►M SrcN1E - I
IF . _
Ile
Y Y ��•Y / Y C� �-" � y Y w Y v w
/ �(' u
S ® I Y� v 1QYCRYY vt Y w0
a �' "(3r°cK ® y y yP:Y✓POP y -
\Y \ 'P\0P .Y o y .y .Y y, .Y .y y, ,y 41
K 11"
-- -
I �
41
I� I Ln 6"
-
Q
\
POST-DEVELOPMENT E Tforest/open
-
SITE AREA 0.88 AC
T R 5 5 Tc - 6.0 MIN
CN- 9 0
\
s
IMPERVIOUS
n -7nArl
1
r
Drainage Area B
A Soils
B Soils
C Soils
D Soils
Totai'Area`
Forest/open S ace undisturbed. protected
en space or reforested land
Area (acres) res)x`S.M-
30
545.p
>q7.�0
.P77
Im
CN
Managed Turf -disturbed graded for yards or other
turf to be mowed/managed
Area acres
CN
r„...0 .k..
- 39
,.,:. ,.0
.. 61
s
.. ,.k - .� ,,.,
. 74
.,
8p ..,•
Impervious Cover
Area (acres)
M?ma o� s
98:
Z
98
x
. • 98
F v
98
CN
CHID- al
:r
1 yearstorm 2 year storm 10 yearstorm
Rvoeveioped (watershed -inch) with no Runoff a tzpZ, � �k 2¢1� � r Lk�44# §•
RVDe„eloped (watershed -inch) with Runoff Reduction*
Adjusted CN*�,i s 9Q s= u ,
1
CHANNEL PROTECTION COMPLIANCE SUMMARY TABLE
Applicable Channel Protection Criteria
Conditions
Criteria A
Criteria B
Criteria C
Discharge
with!"
project
Point
Limits of
consistent
IF x
Analysis
y
Q,
Q�v
Vg
Vw«.aw<
with design of
Qa<vaop<a
RVae aop<a
IF
�"
RV ,e-
p
Q'e m x
w
RVa<veiop<a
5
Qp<a<v
restored
mva<pea
aavdq+:a
RVpr<a<wep<a
.W'<
system
#1
❑ unmade
❑ Restored
❑ YES
0.02
2.02
0.9
0.27
0.32
0.040 JT
® Natural
.078
Channel Protection Criteria
� A. The storm'uater conveyance system conveys the post -development peek flow rate from the two-year 24hour storm event without causing erosion of
0.18AC the system (Va must be shown to be non -erosive)
B. The development p,.I t, in combination with other stormwater runoff, is consistent with the design parameters of the restored slormwaler conveyance
y and the restored stormwater conveyance system is functioning as designed
\ C. The discharge from the development satisfies the Energy Balance requirement
(Crj . rd x RVa, ,Pw) 5 IF x (Q ,k _wwa x RV, "Pr")
where:
1 n.__,_.._. c rh,. nook rlrw rare of ni ff *- rh,. d-1-d cirr
2 \ 24"
3REEN
-6
ITIAL
!EA
VLI� 412-r-
- �c-
18"OAK Y y 1W"�
w w v y w s Y I y y- J
-i-)�L 1 .s,rL+y��nn 2 _,^^� �n nAVVA +A / r
/
JUUUICV UVw11JL1CU1r1 Ml CV lAV IV IL
lame Subareas (acre) (min) (min)
SITE -PRE 0.88 59 8.00 8.00 I
Computed Results:
fo
Peak Discharge (Qp): 0.272 cfs
Time to Peak: 12.10 hrs /
Runoff Volume: r 0.01 acre-ft / --20 20
1 / SCALE: 1 "-2% /
IX
X
I24"PINE
X + 1
I 1,
X r
8'�PIN
I0"POP 5"PIN1
(
124" IPNE
X 10"POP
C+'
r 36" OAKX2 / �
4 � , 10r'�PL
-POST- DEVELOPMENT
Runoff Hydrograph: TR-55 Tabular
Hydrograph Method--�-
Input Data:
/ Rainfall Distribution Type:
Type II
Rainfall Depth:
3.04
in
Base Flow:
0.000
cfs
la/P Interpolation:
On
Subarea Downstream
Area
CN
flame Subareas
(acre)
/SITE -POST
0.88
90
Computed Results:
Peak Discharge (Qp):
2.807
cfs
Time to Peak:
12.10
hrs
Runoff Volume: r
0.09
acre-
I f
CONCLUSION:
IN ACCORDANCE WITH CHANNEL PROTECTION SECTION
B.3.A OF 9VAC25-8 0-66 V GI I 7 OF IR N A LAW; THE
MAXIMUM PEAK FLOW RATE FROM THE ONE-YEAR
24-HOUR STORM FOLLOWING THE LAND -DISTURBING
ACTIVITY APPEARS TO BE IN ACCORDANCE WITH THE
ENERGY BALANCE METHODOLOGY:
j QDEVELOPED S I.F.*(QPRE-DEVELOPED*
1 RVPRE-DEVELOPED)/RVDEVELOPED
0.02 S 0.90*(0.27*0.32)/2.02 OR 0.02 S 0.04
"
80' PROPOSED
RIGHT TURN TAPER.
rVM ' u i .............
�- (n C e
J CD
1� Q- 0
:r
POLE---'
r-
�� C�7
_0
Tc Tt O Reservoir Routing: Storage Indication Method
(min) (min)
6.00 6.00 Input Files:
Inflow Hydrograph Curve: REV- 1 YR-POST.hyd
Stage -Storage Curve: DEl- PIPES.cap
Stage -Discharge Curve: DEf PIPES.stg
Results: _
Inflow Peak Flow: 2.81 cfs 2'0 ____ �• �0- 40 0
' Inflow Peak Time: 12.10 hr
Routed Peak Flow: 0.02 cfs
Routed Peak Time: 23.50 hr �' \
/ Maximum Storage: 0.1328 acre-feet SCALEfl'/==2
r Maximum Ele/yation: i 597.46 ft r \
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DESIGNED BY:
JLF (VSMP)
DRAWN BY:
JLF/UVN
-CHECKED BY:
JLT
III �t'Z,TH 0P
Jimmy L. Taggart
Lic. No.
22841
0 N A L
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DATE:
OCTOBER 25 2019
SCALE:
1 "=20'
JOB:
GTH
FILE:
19.0125
SHEET:
8 OF 9
,
I
Taal ea'ar s
Drainage Area C A Soils 8 Soils C Soils D Soils Total Area {ages) 4 31, 'i. � I Drainage Area D A Soils B Soils C Soils D Soils „=,n Ar { cJ 4
k ...., ey rX ,... .. r .. .,:e „w CONCLUSION.
. a .. ... . a.,. vr,3, ds. ,... �. ,... r�:: .Run edudio .. ... Forest/Open5 ace undisturbed protected Area acres -:�._: ..a ,7 ,�.0 V. .,.. 0P ,. ,.... �•- -., Ru aff Reductro :,.,.-.:a,.,
Forest O en5 ace undisturbed, protected Area acres �t ..G. _..,. _,417. ._. e. s.,GAP OPP ., � _affR ..... ,.,.,.,P .... ...4.,.
/ P P , P ( ) ._v .�i-.,-,z2��,:r"r.0.�.s,:r�3.er,,.e,-..,�.."�.'+.,'+.�:. ..zs....��..�..�...�a.�.,sn ,.:�«.�.<..,c.,,,.,:,� «.1 ; ,s „�,. _, :,,,v ( I ,,..s,.:v�L;4,�
PRE —DEVELOPMENT forest/open space or reforested land CN 30 55 77 Volume ft . F' D ;" P 0 ST D EVE LO P M E NT \ forest/open space or reforested land CN 30, 55 70 77 i=:¢,Valumetft). . 4' IN REFERENCE TO FLOG PROTECTION SECTION C Q N CTI N 1 \ THE
..,a rasa �, a*,qt l r 'a7 a)f
Managed graded for yards or other Area acres _ .Y„-, G0. ,.,.,.a. ti� P. ....- N'aG,P �..,. Mana edTurf—disturbed raded for ards or other Area acres ,,.v„
8 , 8 Y (acres) . '�s.��Lrt ut3� � ,ar4= �..,.,..,.„� � � 8 , 8 Y ( )
CN 3J - 61 74 80 b ro ana ed CN 3 SITE'S P 0 0 turf to be mowed/managed turf to en wed m 9 61 74 .8V POINT F DISCHARGE RELEASES CAPTURED
E =0.31 ACDRAINAGE AREA-0.72 AC
DRAINAGE A R A �,Area (acres), t , -o_ ram a g
P Rs�, °'�� '''�-�����{ �'•°�='N-�-' � p (acres) � �`��p0-� � �-° ' 4 °�°�� �'- °•a STORMWATER INTO A CONVEYANCE SYSTEM THAT,
4i� V....,,.;:s.' Area acres �f; .H�'
Impervious Cover CN Impervious Cover
. ,. 9$ ... 98 .. -. � - . 98 9$ CN � 98 08 98 : . 98
T R 5 5 Tc = 8.0 MIN \ � `"`°�" TR 5 5 Tc = 6.0 MIN cN,°a°, FOLLOWING LAND DISTURBING ACTIVITY, CONFINES THE
71
POST— DEV LOP ENT PEAK FLOW RAT FROM THE
C N — 9 2 lyearstorm 2yearstorm 10yearstorm 10—YEAR 24—HOUR STORM EVENT WITHIN THE
C N = 71 ` 1 year storm Z year storm 14 year storm RV°eveloped (swtershed-inch) with no Runoff ReducUon� ;+ 1 2A E a 8i rj E z 4 i5 z,,
RVoevernped(watershed-inch) with no Runoff Reductions i,°�.frG7t3'vr' u.,lrl)T ts; Scss,a7,5ft�'„yn t RV°eve,oped(watershed-inch) with Runoff Reductlonb ta;z;`�2P ,.r'*''�$"rb*z $-..:✓x`Q fi5 j1..d STORM WATER CONVEYANCE SYSTEM.
\ ' RV°eveope ld(watershed-inch) with Runoff Reductionfkr s 'a§ i:r 31$ arZ £7 a 1 \ AdjustedCN'
Y L L \ \
\\
Adjusted CNsk.`k3>
EXISTING ' - — — tr _, ; IMPERVIOUS \ \ \ _ — —," f _ �L Quo RETDDEVELOPEDD 1.23 09CFSS S
\ \ \ II 0.60AC
WOODS ' 1 h 1 \ r w � 0.17AC
80' PROPOSED
Name V Subareas (acre) (min) (min)
/
DA—PRE 0.31 71 8.00 8.00 I
Computed Results:
Peak Discharge (Qp): 1.229 cfs f i
Time to Peak: 12.10 hrs
l Runoff Volljme: i 0.04 acre—ft ' / 20 ____
SCALE: 1 "-2�
wW I! RIGHT TURN TAPER.
TURF ` 1 Co
0.12AC `
` \ TMP 60E-1 ' WM
DYNAMIC INVESTMENT r
lame
Subareas (acre)
(min) (min) vJv v ��...,y• y V Vyy v VV v
v vV
DA—POST
0.72 92
6.00 6.00 Input Files:
/
Inflow Hydrograph Curve:
REV-10YR—POST.hyd
Computed
Results:
Stage —Storage Curve:
DET PIPES.cap
Stage —Discharge Curve:
DET PIPES.stg
Peak
Discharge (Qp): 5.280
cfs
Time
to Peak: 12.10
hrs Results:
Runoff Volume: i 0.17
acre—ft Inflow Peak Flow:
5.28
cfs
2-0
I
' Inflow Peak Time:
Routed Peak Flow:
12.10
0.09
hr
cfs
.._.—
/
Routed Peak Time:
18.50
hr
SCALE
Maximum Storage:
0.2058
acre—feet
1
I
Maximum Elevation:
/
598.95
ft
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Lic. No.
22841
ONAL
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DESIGNED BY:
JLF (VSMP)
DRAWN BY:
JLF/UVN
'CHECKED BY:
JILT
DATE:
OCTOBER 25 2019
SCALE:
1 "=20'
JOB:
GTH
FILE:
19.0125
SHEET:
OF 9