HomeMy WebLinkAboutWPO201300030 Plan - Approved 2013-04-19SURPLUS Su IL DISPOSAL AREA: WE TSEL PH L
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FOR
LAND OWNER:
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THOMAS D WETSEL, LIFE ESTATE
878 E RIO ROAD
CHARLOTTESVILLE, VA 22901
PHONE: (434) 978 -7840
PREPARED FOR:
WILL ASHWELL, PROJECT MANAGER
GENERAL EXCAVATION, INC.
9757 RIDER ROAD
WARRENTON, VA, 20187
PHONE: (540) 439 -2202
PROJECT DESIGN ENGINEER:
RACEY ENGINEERING, PLLC
312 WEST MAIN STREET,
PO BOX 387
LURAY, VA 22835
PHONE. (540) 743 -9227
FAX: (540) 743-6118
M
PROJECT NO.: 0250-104- 10J1 C
ALBEMARLE- COUNTY, VIRGINIA .
PARCEL 0.0 06 7 00- 00- 00 -7 67C0
ZONED: 144CAfJ7 RESIDENTIAL R1 - R75
VICINITY MAP
SCALE 1 "= 1,000'
GENERAL NOTES.- "NORMAL' PROJECT PROCEDURES
1. ANY DISCREPANCIES FOUND BETWEEN THE DRAWINGS AND
SPECIFICATIONS, AND SITE CONDITIONS OR ANY INCONSISTENCIES
OR AMBIGUITIES IN DRAWINGS OR SPECIFICATIONS SHALL BE
IMMEDIATELY REPORTED TO THE ENGINEER IN WRITING WHO
SHALL PROMPTLY CORRECT SUCH INCONSISTENCIES OR
AMBIGUITIES IN WRITING. WORK DONE BY THE CONTRACTOR
AFTER HIS DISCOVERY OF SUCH DISCREPANCIES,
INCONSISTENCIES, OR AMBIGUITIES SHALL BE DONE AT THE
CONTRACTOR'S RISK.
2. THE LOCATION OF EXISTING UTILITIES AS SHOWN IS APPROXIMATE
ONLY. THE CONTRACTOR IS RESPONSIBLE FOR LOCATING ALL
PUBLIC OR PRIVATE UTILITIES WHICH LIE IN OR ADJACENT TO THE
CONSTRUCTION SITE. THE CONTRACTOR SHALL BE RESPONSIBLE
FOR REPAIRING, AT HIS EXPENSE, ALL EXISTING UTILITIES
DAMAGED DURING CONSTRUCTION.
3. FORTY - EIGHT (48) HOURS PRIOR TO ANY EXCAVATION CALL
MISS UTILITY IN ACCORDANCE WITH ALL LOCAL AND REGIONAL
CODES.
4. ALL CONSTRUCTION IS TO BE IN ACCORDANCE WITH LOCAL
AUTHORITY STANDARDS AND SPECIFICATIONS.
5. WORK IN THIS PROJECT SHALL CONFORM TO THE LATEST
EDITIONS OF THE VIRGINIA DEPARTMENT OF TRANSPORTATION
(VDOT) ROAD AND BRIDGE SPECIFICATIONS, THE VDOT ROAD AND
BRIDGE STANDARDS, THE VIRGINIA EROSION AND SEDIWENT
CONTROL REGULATIONS AND THE STANDARDS MANUAL OF THE
LOCALITY IN WHICH THE WORK WILL BE PERFORMED.
6. ALL MATERIALS USED FOR FILL OR BACK -FILL SHALL BE FREE
OF WOOD, ROOTS, OR ANY OTHER NON- COMPACTIBLE SOIL TYPE
MATERIAL. UNSATISFACTORY MATERIALS ALSO INCLUDE: MAN -MADE
FILLS AND REFUSE DEBRIS DERIVED FROM ANY SOURCE.
7. SATISFACTORY MATERIAL FOR USE AS FILL FOR THIS PROJECT
SHALL BE SURPLUS SOIL AND ROCK FROM THE RTE 250 ROAD
PROJECT. LARGE ROCKS ARE TO BE CRUSHED TO A MANAGEABLE
SIZE THAT DOES NOT IMPEDE THE FILLING /GRADING OPERATION.
8. EMBANKMENT FILL AND TRENCH BACK -FILL SHALL BE PLACED IN
LIFTS AT A MAXIMUM UNCOMPACTED DEPTH OF 8- INCHES AND
6- INCHES, RESPECTIVELY. DENSITY TESTS SHALL BE
CONDUCTED AT THE FOLLOWING MINIMUM FREQUENCIES:
A. EMBANKMENTS FOR ROADS, STREETS, DAMS, ETC: ONE
TEST PER LIFT PER 10,000 SQUARE FEET.
B. BACK -FILL AROUND STRUCTURES AND IN TRENCHES: ONE
TEST PER LIFT PER 500 LINEAL FEET.
C. SURPLUS SOIL DISPOSAL AREAS DO NOT REQUIRE DENSITY
TESTING.
9. THE CONTRACTOR SHALL PROVIDE THE LOCAL AUTHORITIES A
MINIMUM OF 96 HOURS NOTIFICATION PRIOR TO ANY
INTERRUPTION OF WATER SERVICES.
10. THE MORE STRINGENT SPECIFICATIONS FOUND IN THIS PLAN AND
THE LAND -USE AGREEMENT BETWEEN CONTRACTOR AND OWNER
SHALL APPLY THROUGHOUT THE LIFE OF THE PROJECT.
11. THE ENGINEER HAS NOT PERFORMED AN ENDANGERED SPECIES,
HABITAT ASSESSMENT, OR ARCHEOLOGICAL SURVEY OF THE
PROPOSED PROJECT AREA.
SHEET INDEX:
T1 -
TITLE SHEET
C 1 -
ESC NARRATIVE
C2 -
ESC & GRADING PLAN
C3 -
ESC DETAILS
C4 -
DRAINAGE AREAS
PROJECT
DESCRIPTION:
THIS PROJECT IS
OPERATIONS PL -Af
IS PROPOSING A
OF DISTURBANCE
3.06 ACRES.
I
THE CONTINUATION OF A DISPOSAL
\! ON THIS SITE. THE CONTRACTOR
REDUCED FOOTPRINT FOR THE AREA
FROM APPROXIMATELY 3.5 ACRES TO
f
S
1;
RESPONSIBLE LAND DISTURBER
NAME
Fti
CERTIFICATION NO.:
DA TE:
THE RESPONSIBLE LAND DISTURBER IS THE
PARTY RESPONSIBLE FOR CARRYING OUT
THE LAND DlS%URBING ACTIVITY AS SET
FORTH IN. THE PLANS.
This copy of the approved plan is
reserved for the official files of
Albemarle County. Please do not
remove this plan from the file.
eRQ.910N CONTWL RAN
R viewed and appcov9d by thq
A1berna6a County 1r ngir:eeriing Depa'irr it
Date:__
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"TERMS OF ENGINEER DESIGNS (INDUSTRY STANDARDS):
THE ENGINEER IS PROVIDING NOTICE TO THE CLIENT OF THE FOLLOWING SPECIFIC TERMS: THE PLAN PREPARATIONS HAVE BEEN MADE
WITH ALL REASONABLE AND PROFESSIONAL CARE GIVEN TO DESIGN DETAILS AND COORDINATION. HOWEVER, UNINTENTIONAL ERRORS, OR
OMISSIONS, ARE A NORMAL PART OF ANY WELL PREPARED ENGINEERING DESIGN /CONSTRUCTION DOCUMENTS. THIS PLAN
REPRESENTATION IS BASED ON THE CLIENT'S UNDERSTANDING AND ACCEPTANCE OF THIS PREMISE, AND THAT THE CONSTRUCTION
CONTRACT BUDGET WILL CONTAIN A REASONABLE CONTINGENCY COST TO COVER THESE TYPES OF NORMAL DESIGN OR COORDINATION
ERRORS OR OMISSIONS.
THE STANDARDS OF CARE FOR ALL PROFESSIONAL ENGINEERING AND RELATED SERVICES PERFORMED OR FURNISHED BY ENGINEER ARE
OF THE CARE AND SKILL ORDINARILY USED BY MEMBERS OF THE SUBJECT PROFESSION PRACTICING UNDER SIMILAR CIRCUMSTANCES AT
THE SAME TIME AND IN THE SAME LOCALITY. ENGINEER MAKES NO WARRANTIES, EXPRESS OR IMPLIED, IN CONNECTION WITH
ENGINEER'S SERVICES. ENGINEER AND ITS CONSULTANTS MAY USE OR RELY UPON THE DESIGN SERVICES OF' OTHERS, INCLUDING, BUT
NOT LIMITED TO, CONTRACTOR'S, MANUFACTURERS, AND SUPPLIERS.
EROSION AND SEDIMENT CONTROL NARRATIVE
PROJECT DESCRIPTION:
THE PROJECT IS A SURPLUS SOIL DISPOSAL AREA ADJACENT TO RTE. 631 ON THE WETSEL PROPERTY HAVING PARCEL ID:
06100- 00- 00- 167CO. THE SURPLUS SOIL IS TO TAKEN FROM THE CITY OF CHARLOTTESVILLE PROJECT HAVING PROJECT NO.
0250 -104 -103, C501. THE EXPECTED LIMITS OF DISTURBANCE AS OUTLINED ON THE SITE PLAN IS 3.06 ACRES. THE PROJECT WILL
HAVE NO INCREASE IN IMPERVIOUS AREA IN THE POST — DEVELOPMENT CONDITION. THE PROJECT IS EXPECTED TO BEGIN IN MARCH
2013 AND REMAIN OPEN AS A SOIL DISPERSAL AREA UNTIL FINAL DESIGN GRADES ARE MET (APPROXIMATELY 120 DAYS). THE
FINISHED SITE WILL BE SEEDED AND STABILIZED. THE OWNER WILL CONTINUE TO USE THE PROJECT AREA AS AN OPEN, UNFENCED,
GRASS FIELD IN THE POST— CONSTRUCTION CONDITION.
EXISTING SITE CONDITIONS:
THE EXISTING SITE SLOPES TO THE SOUTH AS A LARGE GRASS /PASTURE SWALE, HAVING SLOPES OF A MUCH AS 25 PERCENT. AREAS
WHERE ROCK IS NOT VISIBLE AT THE SURFACE CONSIST OF PASTURE GROUND. THE CONTRACTOR IS TO MARK THE LIMITS OF
DISTURBANCE IN THE FIELD WITH FLAGGING OR RIBBON, WHICH WILL ALSO BE THE LIMIT OF CLEARING OPERATIONS. THE ULTIMATE
DRAINAGE PATTERNS WILL NOT BE CHANGED AS A RESULT OF THE PROPOSED CONSTRUCTION.
ADJACENT AREA:
ADJACENT PROPERTIES AND ROADWAYS ARE TO BE KEPT IN A MUD — AND — DUST —FREE CONDITION DURING ALL PHASES OF
CONSTRUCTION. DOWNSTREAM PROPERTIES WILL BE PROTECTED FROM SEDIMENTATION BY USE OF PERIMETER EROSION AND SEDIMENT
CONTROLS SPECIFIED IN THIS PLAN.
OFF —SITE AREAS:
OFF —SITE CONSTRUCTION WILL BE BEING PERFORMED ON STATE ROUTES 623 AND 638 WHICH IS COVERED UNDER EXISTING PLANS AND
PERMITS. ANY ADDITIONAL BORROW OR WASTE AREAS REQUIRED OUTSIDE OF THE VDOT PROJECT LIMITS MUST BE COVERED UNDER AN
EXISTING AND /OR SEPARATE LAND DISTURBANCE PERMIT.
SOILS:
THE SOILS MAP AND SOILS DESCRIPTIONS HAVE BEEN INCLUDED ON THIS SHEET. THE SOIL DATA WAS OBTAINED FROM THE USDA
(WEB) SOIL SURVEY.
Note: K— factor is a factor that indicates susceptibility of soil to sheet and rill erosion by water with values ranging from 0.02 to
0.69 (the higher the value the more susceptible the soil is to erosion). Hydrologic Soil Groups indicate runoff potential of the soil
with Group A having high infiltration, Group B having Moderate Infiltration, Group C having slow infiltration, and Group D having very
slow infiltration. The pH value is used to approximate the required lime rate to be applied to the soil when seeding.
CRITICAL AREAS:
THERE ARE NO CRITICAL AREAS ON THE PROJECT. HOWEVER, AS WITH ANY LAND DISTURBANCE ACTIVITY, ALL WORK SHOULD BE
PERFORMED IN FAVORABLE WEATHER CONDITIONS.
EROSION AND SEDIMENT CONTROL MEASURES:
UNLESS OTHERWISE INDICATED, ALL VEGETATIVE AND STRUCTURAL EROSION AND SEDIMENT CONTROL MEASURES SHALL BE CONSTRUCTED
AND MAINTAINED ACCORDING TO THE MINIMUM STANDARDS AND SPECIFICATIONS OF THE LATEST EDITION OF THE VIRGINIA EROSION AND
SEDIMENT CONTROL HANDBOOK. THIS PLAN DEPICTS ADEQUATE PERIMETER CONTROLS WITH THE UNDERSTANDING THAT FIELD
CONDITIONS MAY REQUIRE ADDITIONAL CONTROLS OR MODIFICATIONS TO MEASURES AS SPECIFIED HEREIN. THE ENGINEER, OR LOCAL
EROSION AND SEDIMENT CONTROL ADMINISTRATOR, RESERVES THE RIGHT TO PRESCRIBE ADDITIONAL MEASURES DURING CONSTRUCTION.
STRUCTURAL MEASURES:
TEMPORARY CONSTRUCTION ENTRANCE (3.02) SHALL BE INSTALLED AS SHOWN ON THE PLAN TO PREVENT MUD AND DUST FROM BEING
TRACKED ONTO STATE ROADWAYS UNLESS THE CONSTRUCTION IS SEQUENCED SUCH THAT THE TRAFFIC MOVEMENT IS CONTINUOUS FROM
THE VDOT CONSTRUCTION ZONE TO THE WASTE AREA WITHOUT CROSSING THE PUBLIC ROAD. EXTRA PRECAUTIONS MAY BE REQUIRED
BY THE CONTRACTOR TO ENSURE THAT NO MUD OR DUST IS BEING TRACKED ONTO THE HIGHWAY BY CONSTRUCTION VEHICLES.
SILT FENCE (3.05) SHALL BE INSTALLED AS SHOWN ON THE PLANS TO FILTER SEDIMENT LADEN RUNOFF FROM DISTURBED AREAS.
CULVERT INLET PROTECTION (3.08) SHALL BE INSTALLED AT INLET OF CULVERTS DOWNSTREAM OF LAND DISTURBING ACTIVITIES TO
FILTER SEDIMENT LADEN RUNOFF PRIOR TO IT ENTERING THE CULVERT.
TEMPORARY DIVERSION DIKE (3.09) SHALL BE INSTALLED AS INDICATED ON THE SITE PLAN TO DIVERT SEDIMENT LADEN RUNOFF INTO
THE PROPOSED SEDIMENT TRAP AND TO DIVERT CLEAN WATER AROUND THE DISTURBED AREA TO A STABILIZED OUTFALL. TEMPORARY
DIVERSION DIKES MUST BE MAINTAINED THROUGHOUT THE LIFE OF' THE PROJECT.
TEMPORARY SEDIMENT TRAP (3.13) SHALL BE INSTALLED AS SHOWN ON THE SITE PLAN AND MUST BE CONSTRUCTED TO AT LEAST THE
MINIMUM SIZE REQUIREMENTS PROVIDED. DIMENSIONS HAVE BEEN TABULATED FOR THE TRAP BASED ON TOTAL DRAINAGE AREA BEING
SERVED BY THE TRAP.
VEGETATIVE MEASURES:
PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN SEVEN (7) DAYS AFTER FINAL GRADE IS
REACHED ON ANY PORTION OF THE SITE [FIVE (5) DAYS FOR CUT OR FILL SLOPES]. TEMPORARY SOIL STABILIZATION SHALL BE
APPLIED WITHIN SEVEN (7) DAYS TO DENUDED AREAS THAT MAY NOT BE AT FINAL GRADE BUT WILL REMAIN DORMANT FOR LONGER
THAN FOURTEEN (14) DAYS. PERMANENT SOIL STABILIZATION SHALL BE APPLIED TO ALL AREAS THAT ARE TO BE LEFT DORMANT FOR
MORE THAN SIX (6) MONTHS.
TOPSOIL THAT HAS BEEN STOCKPILED SHALL BE SURROUNDED WITH SILT FENCE ON THE DOWNSTREAM SIDE AND PROTECTED BY MULCH
AND /OR TEMPORARY VEGETATION IMMEDIATELY AFTER GRADING. TOPSOIL SHALL NOT BE STOCKPILED IN DRAINWAYS.
MAINTENANCE:
ALL CONTROL MEASURES SHALL BE INSPECTED DAILY BY THE SITE SUPERINTENDENT OR HIS REPRESENTATIVE AND WITHIN 24 HOURS
AFTER ANY STORM EVENT GREATER THAN 0.5 INCHES OF RAIN PER 24 HOUR PERIOD. IT IS RECOMMENDED THAT THE CONTRACTOR
UTILIZE INSPECTION REPORTS AND KEEP QUALITY RECORDS OF ALL MAINTENANCE. ANY DAMAGED STRUCTURAL MEASURES ARE TO BE
REPAIRED BY THE END OF THE DAY. SEEDED AREAS SHALL BE CHECKED REGULARLY TO ENSURE THAT A GOOD STAND OF GRASS IS
MAINTAINED. ALL AREAS SHALL BE FERTILIZED AND RE— SEEDED AS NEEDED UNTIL GRASS IS ESTABLISHED.
TEMPORARY SILT FENCE (AND ALL PERIMETER CONTROL MEASURES) SHALL BE CHECKED REGULARLY FOR SEDIMENT BUILD —UP. IF ANY
EROSION AND SEDIMENT CONTROL IS CLOGGED BY SEDIMENT X THE HEIGHT OF THE IN.STALILATION, IT SHALL BE REMOVED AND
CLEANED OR REPLACED IMMEDIATELY. SEDIMENT IS TO BE REMOVED FROM THE SEDIMENT TRAP ONCE THE SEDIMENT HAS
ACCUMULATED TO X THE VOLUME OF WET STORAGE. TEMPORARY DIVERSION DIKES AND CHANNELS SHALL. BE INSPECTED ONCE EVERY
TWO WEEKS OR AFTER STORM EVENTS TO BE SURE THAT NO EROSION OR SEDIMENT BUILD —UP IS OCCURRING.
DIVERSION DIKES AND CHANNELS SHALL BE INSPECTED REGULARLY FOR SEDIMENT BUILD —UP AND /OR DAMAGE DUE TO CONSTRUCTION
TRAFFIC. REPAIR ANY DAMAGES IMMEDIATELY.
THE UPSTREAM LEADING EDGE OF THE CORE DRAIN IS DESIGNED TO TRAP AND FILTER SEDIMENT. SEDIMENT SHALL BE CLEANED FROM
THE INLET IF IT ACCUMULATES BEYOND Y3 HEIGHT OR 1 FOOT. REPLACEMENT STONE MAY BE REQUIRED. ' SIMILAR MAINTENANCE IS
REQUIRED FOR THE DOWNSTREAM FILTER RING.
THE CONTRACTOR IS RESPONSIBLE FOR KEEPING EXISTING PUBLIC ROADS IN A CLEAN, DUST, AND MUD FREE CONDITION AT ALL TIMES.
PERMANENT STABILIZATION:
ALL AREAS DISTURBED BY CONSTRUCTION SHALL BE STABILIZED WITH PERMANENT SEEDING IMMEDIATELY FOLLOWING FINAL GRADING.
SEEDING SHALL BE DONE ACCORDING TO SPECIFICATIONS PROVIDED IN THE RELATED VDOT PROJECTS. Ili LIEU OF TESTING THE
TOPSOIL TO DETERMINE IF AND WHAT RATE TO APPLY SOIL SUPPLEMENTS, THE CONTRACTOR CAN PROVIDi: THE FOLLOWING MINIMUM
SPECIFICATIONS:
TOPSOIL SHALL BE SPREAD AT A DEPTH OF 2" TO 4 ", UNLESS OTHERWISE SPECIFIED, IN ANY AREA WHERE THE EXISTING TOPSOIL HAS
BEEN STRIPPED DURING CONSTRUCTION. I
PULVERIZED AGRICULTURE LIMESTONE SHALL BE INCORPORATED INTO THE SOIL AT A RATE OF 92 LBS PT 1000 SF (2 TONS PER
ACRE) UNLESS OTHERWISE SPECIFIED IN THE VDOT ROADSIDE DEVELOPMENT PLAN. 4
FERTILIZE WITH 15 -30 -15 AT A RATE OF 300 LBS PER ACRE OR AS OTHERWISE SPECIFIED BY SOIL TESTING OR BY MORE STRINGENT
SPECIFICATIONS PROVIDED IN THE VDOT ROADSIDE DEVELOPMENT PLAN.
STRAW MULCH SHALL BE APPLIED TO ALL SEEDED AREAS AT THE RATE SPECIFIED IN THE VDOT DRAWING
TEMPORARY SEEDING IS TO BE PERFORMED IN ACCORDANCE TO THE SPECIFICATIONS PROVIDED FOR THE ?ELATED VDOT PROJECT.
!PERMANENT SEEDING RATES AND SCHEDULE SHALL BE IN ACCORDANCE WITH THE VDOT PROJECT ROADSICE DEVELOPMENT PLAN UNLESS
I MORE STRINGENT MEASURES ARE REQUIRED BY CONTRACT BETWEEN THE LAND OWNER AND CONTRACTOR.
STORMWATER MANAGEMENT:
THERE IS TO BE NO INCREASE IN STORMWATER RUNOFF AS A RESULT OF THE PROPOSED CONSTRUCTION. NO ADDITIONAL STORMWATER
MANAGEMENT STRUCTURES ARE BEING PROPOSED. ALL TEMPORARY PERIMETER CONTROLS ARE TO BE REMOVED ONCE THE SITE IS
PERMANENTLY STABILIZED TO RESTORE THE NATURAL DRAINAGE PATTERNS. THE STORMWATER POLLUTION PREVENTION PLAN FOR THE
VDOT PROJECT REFERENCED HEREIN SHALL BE ADHERED TO FOR CONSTRUCTION OF PROPOSED IMPROVEMENTS CONTAINED IN THESE
PLANS.
MANAGEMENT STRATEGIES:
GENERAL SEQUENCE OF CONSTRUCTION (SEE DETAILED SEQUENCE FOR EACH PHASE ON THE DRAWINGS):
1. PERIMETER EROSION AND SEDIMENT CONTROLS SHALL BE INSTALLED AS A FIRST STEP IN THE LAND DISTURBANCE ACTIVITY.
2. CLEAR AND GRUB. STRIP AND STOCKPILE TOPSOIL.
3. BEGIN FILLING OPERATION, APPLY PERMANENT SEEDING ONCE FINAL GRADES ARE REACHED.
5. ONCE ENTIRE AREA IS STABILIZED, REMOVE EROSION AND SEDIMENT CONTROLS.
CONSTRUCTION SHALL BE SEQUENCED SUCH THAT GRADING OPERATIONS WILL BEGIN AND END AS QUICKLY AS POSSIBLE. A MORE
DETAILED SEQUENCE OF CONSTRUCTION IS PROVIDED ON SHEET C2.
THE SITE SUPERINTENDENT AND THE RESPONSIBLE LAND DISTURBER SHALL BE RESPONSIBLE FOR THE INSTALLATION AND MAINTENANCE
OF ALL EROSION AND SEDIMENT CONTROL MEASURES. MAINTENANCE OF THESE MEASURES THROUGHOUT THE PROJECT IS CRITICAL TO
THE EFFECTIVENESS OF THE PROGRAM.
DEVICES SPECIFIED IN THIS PLAN ARE CONSIDERED MINIMUM EROSION AND SEDIMENT CONTROLS. ADDITIONAL CONTROL MEASURES MAY
BE NECESSARY DUE TO CONTRACTOR PHASING OR OTHER UNFORESEEN CONDITIONS. I7" IS THE CONTRACTOR'S RESPONSIBILITY TO
PROVIDE ADDITIONAL MEASURES TO THOSE SHOWN, AS NEEDED, IN ORDER TO CONTROL THE EROSION ON THE SITE. ALL MEASURES
SHALL BE INSTALLED ACCORDING TO THE STANDARDS AND SPECIFICATION OF THE LATEST EDITION OF THE VIRGINIA EROSION AND
SEDIMENT CONTROL HANDBOOK AND /OR VDOT ROAD AND BRIDGE STANDARDS.
ALL APPLICABLE EROSION AND SEDIMENT CONTROLS SHALL BE ADHERED TO THROUGHOUT THE LIFE OF THE PROJECT.
GENERAL EROSION AND SEDIMENT CONTROL NOTES
ES -1: UNLESS OTHERWISE INDICATED, ALL VEGETATIVE AND STRUCTURAL EROSION AND SEDIMENT CONTROL PRACTICES WILL BE
CONSTRUCTED AND MAINTAINED ACCORDING TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE VIRGINIA EROSION AND SEDIMENT
CONTROL HANDBOOK AND VIRGINIA REGULATIONS VR 625 -02 -00 EROSION AND SEDIMENT CONTROL REGULATIONS (4VAC50 -30).
ES -2: 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. THE NAME OF THE
RESPONSIBLE LAND DISTURBER MUST BE PROVIDED TO THE PLAN— APPROVING AUTHORITY PRIOR TO ACTUAL ENGAGEMENT IN THE
LAND— DISTURBING ACTIVITY SHOWN ON THE APPROVED PLAN. IF THE NAME IS NOT PROVIDED PRIOR TO ENGAGING IN THE
LAND— DISTURBING ACTIVITY, THE PLAN'S APPROVAL WILL BE REVOKED.
ES -3: ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR TO OR AS SOON AS THE FIRST STEP IN
CLEARING.
ES -4: A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL PLAN SHALL BE MAINTAINED ON THE SITE AT ALL TIMES.
ES -5: PRIOR TO COMMENCING LAND DISTURBING ACTIVITIES IN AREAS OTHER THAN INDICATED ON THESE PLANS (INCLUDING, BUT
NOT LIMITED TO OFF SITE BORROW OR WASTED AREAS), THE CONTRACTOR SHALL SUBMIT A SUPPLEMENTARY EROSION CONTROL PLAN
TO THE OWNER FOR REVIEW AND APPROVAL BY THE PLAN APPROVING AUTHORITY.
ES -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.
ES -7: ALL DISTURBED AREAS ARE TO DRAIN TO APPROVED SEDIMENT CONTROL MEASURES AT ALL TIMES DURING LAND DISTURBING
ACTIVITIES AND DURING SITE DEVELOPMENT UNTIL FINAL STABILIZATION IS ACHIEVED, AFTER WHICH, UPON APPROVAL OF THE
PLAN — APPROVING AUTHORITY, THE CONTROLS SHALL BE REMOVED. TRAPPED SEDIMENT AND THE DISTURBED SOIL AREAS RESULTING
FROM THE REMOVAL OF TEMPORARY MEASURES SHALL BE PERMANENTLY STABILIZED TO PREVENT FURTHER EROSION AND SEDIMENTATION.
ES -8: DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN APPROVED FILTERING DEVICE.
ES -9: THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES AT LEAST EVERY 2 WEEKS AND IMMEDIATELY AFTER EACH
RUNOFF — PRODUCING RAINFALL EVENT. ANY NECESSARY REPAIRS OR CLEANUP TO MAINTAIN THE EFFECTIVENESS OF THE EROSION
CONTROL DEVICES SHALL BE MADE IMMEDIATELY.
ES -10: THE CONTRACTOR IS RESPONSIBLE FOR THE DAILY REMOVAL OF SEDIMENT THAT HAS BEEN TRANSPORTED ONTO A PAVED OR
PUBLIC ROAD SURFACE.
ES -1 1: SEEDING OPERATIONS SHALL BE INITIATED WITHIN 7 DAYS AFTER REACHING FINAL GRADE OR UPON SUSPENSION OF GRADING
OPERATIONS FOR AN ANTICIPATED DURATION OF GREATER THAN 30 DAYS OR UPON COMPLETION OF GRADING OPERATIONS FOR A
SPECIFIC AREA.
ES -12: THE CONTRACTOR SHALL BE RESPONSIBLE FOR PREVENTING SURFACE AND AIR MOVEMENT OF DUST FROM EXPOSED SOILS
WHICH MAY PRESENT HEALTH HAZARDS, TRAFFIC SAFETY PROBLEMS, OR HARM ANIMAL OR PLANT LIFE.
ES -13: A VSMP IS REQUIRED FOR PROJECTS DISTURBING 2,500 SQUARE FEET OR GREATER IN A DESIGNATED CHESAPEAKE BAY
PRESERVATION AREA (CBPA) OR 10,000 SQUARE FEET OR GREATER OUTSIDE THE CBPA. FOR MORE INFORMATION VISIT THE VIRGINIA
STORMWATER MANAGEMENT PROGRAM PERMITTING WEB PAGE .AT: http://www.dcr.virgir)ia.gov/soil—and—water/vsmp.shtmI#genforms
Virginia Erosion and Sediment Control Regulations
Section 4VAC50 -30 -40
Minimum Standards
All land— disturbing activities undertaken on private and public lands in the Commonwealth of Virginia must meet the 19 "minimum
standards" for erosion and sediment control (ESC) in Section 4VAC50 -30 -40 of the Virginia Erosion and Sediment Control
Regulations. The applicant who submits the ESC plan to the program authority for approval is responsible for ensuring compliance
with the minimum standards that apply to his /her activities;. A condensed version of the minimum standards is provided below.
Please refer to the Regulations for a complete, unedited copy of the minimum standards.
(1) Soil Stabilization.
• 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 30 days, but less than one year
• Permanent stabilization shall be applied to areas that are to be left dormant for more than one year
(2) Soil Stockpile Stabilization. During construction, soil stockpiles and borrow areas shall be stabilized or protected with sediment
trapping measures. Temporary protection and permanent stabilization shall be applied to all soil stockpiles on site and borrow areas
or soil intentionally transferred off site.
(3) Permanent Stabilization. Permanent vegetative cover sharll 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
• Will inhibit erosion
(4) Sediment Basins & Traps. Sediment basins, sediment traaps, perimeter dikes, sediment barriers, and other measures intended to
trap sediment shall be constructed as a first step in any Ilan d—disturbing activity and shall be made functional before upslope land
disturbance takes place.
(5) Stabilization of Earthen Structures . Stabilization meosurres shall be applied to earthen structures such as dams, dikes, and
diversions immediately after installation.
(6) Sediment Traps & Sediment Basins . Sediment traps and basins shall be designed and constructed based upon the total
drainage area to be served by the trap or basin as follows;:
Sediment Traps
• Only control drainage areas less than three acres
• Minimum storage capacity of 134 cubic yards per acre of drainage area
Sediment Basins
• Control drainage areas greater than or equal to three acres
• Minimum storage capacity of 134 cubic yards per acre of drainage area
• The outfoll system shall, at a minimum, maintain the structural integrity of the basin during a twentyfive year storm of 24 —hour
duration
(7) Cut and Fill Slopes Design & Construction. Cut and fill slopes shall be designed and constructed in a manner that will minimize
erosion. Slopes found to be eroding excessively within one year of permanent stabilization shall be provided with additional slope
stabilizing measures until the problem is corrected.
(8) Concentrated Runoff Down Slopes. Concentrated runoff :shall not flow down cut or fill slopes unless contained within an adequate
temporary or permanent channel, flume, or slope drain structure.
EXISTING TREELIKE
& APPROXIMATE
SITE BOUNDARY
LIMITS
48E
SOILS MAP
t
s
s
i
U s
J
RK
21 C I ,-;0
APPROXIMATE
LOCATION
OF EXISTING
PROPERTY
LINES
SOILS PROPERTIES
MAP
SOIL
pH
K --FAC
HYDROLOGIC
UNIT
�
TOR
SOIL CROUP
21 B
CULPEPER FINE SANDY LOAM
5.0
0.57
C
2 TO 7% SLOPES
21C
CULPEPER FINE SANDY LOAM
5.0
0.57
C
7 TO 15 PERCENT SLOPES
48E
LOUISBURG VERY STONY SANDY
5.5
0.24
B
LOAM, 25 TO 45 PERCENT SLOPES
A
m
(9) Slope Maintenance. Whenever water seeps from a slope face, adequate drainage or other protection shall be
provided.
(10) Storm Sewer Inlet Protection . All storm sewer inlets made operable during construction shall be protected so
that sediment —laden water cannot enter the stormwater
remove sediment.
(11) Stormwater Conveyance Protection. Before newly cc
operational, adequate outlet protection and any required
both the conveyance channel and the receiving channel.
conveyance system without first being filtered /treated to
nstructed stormwater conveyance channels or pipes are made
temporary or permanent channel lining shall be installed in
(12) Work in Live Watercourse is not proposed on this Project.
(13) Crossing Live Watercourse is not proposed on this Project.
(14) Regulation of Watercourse Crossing. All applicable federal, state and local regulations pertaining to working in or
crossing live watercourses shall be met.
(15) Stabilization of Watercourse. The bed and banks of a watercourse shall be stabilized immediately after work in
the watercourse is completed.
(16) Underground Utility Line Installation . Underground utility lines shall be installed in accordance with the following
standards in addition to oither applicable criteria:
• No more than 500 linear feet of trench may be opened at one time
• Excavated material shaall be placed on the uphill side of trenches
• Effluent from dewatering operations shall be filtered or passed through an approved sediment trapping device, or
both, and discharged iin a manner that does not adversely affect flowing streams or off —site property
• Material used for back-filling trenches shall be properly compacted in order to minimize erosion and promote
stabilization
• Restabilization shall be accomplished in accordance with these regulations
• Comply with applicable safety regulations
(17) Vehicular Sediment Tracking . Where construction vehicle access routes intersect paved or public roads:
• Provisions shall be made to minimize the transport of sediment by vehicular trocking 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
(18) Removal of Temporary Measures. 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 program authority. Trapped sediment and the disturbed soil areas resulting from the disposition of temporary
measures shall be permanently stabilized to prevent further erosion and sedimentation.
(19) Stormwater Management . Properties and waterways downstream from development sites sholl 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:
• Concentrated stormwatcer 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.
• Adequacy of all channels and pipes shall be verified:
• Natural Channels — use 2 —year storm event
• Monmade Channels — use 2— and 10 —year storm event
• Pipe and Pipe Systems — use 10 —year storm event
• If existing natural receiving channels or previously constructed mon —made channels or pipes are not adequate, the
applicant shall provide channel, pipe, or pipe system improvement or provide a combination of channel
improvement, site design, stormwater detention, or other measures that is satisfactory to the program authority to
prevent downstream erosion.
• Provide evidence of permission to make the improvements
• If the applicant chooses an option that includes stormwater detention he shall obtain approval from the locality of
a plan for maintenance of the detention facilities. The pion shall set forth the maintenance requirements of the
facility and the person responsible for performing the maintenance.
• Outfall from a detention facility shall be discharged to a receiving channel, and energy dissipators shall be placed
at the outfall of all detention facilities as necessary to provide a stabilized transition from the facility to the
receiving channel.
• Increased volumes of sheet flows that may cause erosion or sedimentation on adjacent property shall be diverted
to a stable outlet, adequate channel, pipe or pipe system, or to a detention facility
• In applying these stormwater runoff criteria, individual lots or parcels in a residential, commercial or industrial
development shall not be considered to be separate development projects. Instead, the development as a whole
shall be considered to be a single development project.
• All measures used to (protect properties and waterways shall be employed in a manner that minimizes impacts on
the physical, chemical and biological integrity of rivers, streams and other waters of the state.
,T H OF
Pie. No. 624926 a4
03 -22 -13
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Pie. No. 624926 a4
03 -22 -13
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EXISTING ENTRANCE \
\ TO DWELLING —�
i
OH %�
�A EXISTING TOPSOIL
/\'o STOCKPILE LOCATION
• of
EXISTING DIVERSION \ / DD
DIKE TO BE / \
RE— GRADED AND / \
RE— SEEDED AS I z
NECESSARY
.\ I
EXISTING TREE LINE /
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—TO BE
RELQCATED AS
DICTATFD BY
ONS
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/
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— EXISTING STONE
ENTRANCE, AMEND
AS DICTATED BY
FIELD CONDITIONS
EXISTING
WOODEN POWER
POLE, TYP.
EXISTING SEDIMENT / \P Mu 490
7-RAP, TO BE REMOVED
AND FILLED AS SHOWN
Ts
SEE EXPANDED °
\\
VIEW, THIS o �}
SHEET
0)
VD
.. --
TS /
I
EXISTING PERM TO 4
BE REMOVED I
400 I J I \ \ \ s I
EXISTING OV -RHEAD
ELECTRIC LINES, I TYP.
rri
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4,80.E
� / I
- - — — — — ______ --- -__ --' •\ // I
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50 0 50 100 EXISTING OHE 1
TREE LINE
SCALE OF FEET
I \
/
/ 1-S p
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\ I
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/ 4S6
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/
46
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SF I \\ \
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/ 120 0 \ 20Q
* SEE SHEET C3 FOR SEDIMENT TRAP
DETAILS AND DIMENSIONS \ \ SCALE �F FEET \
roncinm iP cr lkAr"KIT 0nnlTAnl I C"OC-Mr)
SEQUENCE OF CONSTRUCTION:
1. INSTALL PERIMETER CONTROLS, INCLUDING TEMPORARY
CONSTRUCTION ENTRANCE, SILT FENCE AND DIVERSION
DIKES. APPLY TEMPORARY SEEDING TO DIVERSIONS AND
SEDIMENT TRAP.
2. BEGIN FILLING OPERATION(S).
3. ONCE SOIL DISPERSAL AREA REACHES FINAL GRADE OR
IS NO LONGER REQUIRED, PERMANENTLY STABILIZE THE
FILL AREA. ANY AREAS THAT REACH FINAL GRADE SOONER
THAN OTHERS SHOULD BE STABILIZED AS SOON AS
PRACTICABLE.
4. ONCE SITE IS PERMANENTLY STABILIZED, REMOVE
TEMPORARY FEATURES, MEASURES AND CONTROLS AND
PERMANENTLY STABILIZE THOSE AREAS ACCORDINGLY.
5. REMOVE PERIMETER CONTROLS ONCE THE PROJECT IS
STABILIZED WITH AN ADEQUATE STAND OF GRASS.
PROJECT SITE NOTES:
1. TEMPORARY SOIL STOCKPILES SHOULD BE SEEDED WITHIN
SEVEN (7) DAYS.
2. ALL TEMPORARY DIVERSION DIKES SHALL BE MAINTAINED
THROUGHOUT THE LIFE OF THE PROJECT.
3. ALL FINAL GRADE ELEVATION CONTOUR LINES ARE
APPROXIMATE IN NATURE AND ARE INTENDED (ONLY) TO
REPRESENT DESIRABLE FILL AND DRAINAGE PATTERNS.
PLAN QUANTITY DEVIATIONS ARE TO BE EXPECTED,
o
0
L • a V I v 1 V iJM V L 6.' 1 1 7 1 &_ 1 Y i V V 1 7 1 1\ V &_ "9— \./ I— 1
NO.
KEY
SYMBOL. DESCRIPTION
3.02
CE
STONE CONSTRUCTION ENTRANCE
3.05
SF
SILT FENCE (WITH WIRE SUPPORT)
3.09
DD
100
DIVERSION DIKE
3.13
ST
aci
TEMPORARY SEDIMENT TRAP
D
3.31
TS
TEMPORARY SEEDING
3.32
PS
PERMANENT SEEDING
3.35
MU
MULCHING
— — — —
— LIMITS OF DISTURBANCE
m
— — — — —
810 - — — —
_ EXISTING CONTOURS (2' INTERVAL)
810
PROPOSED CONTOURS (2' INTERVAL)
^--
DRAINAGE FLOW DIRECTION ARROWS
SEQUENCE OF CONSTRUCTION:
1. INSTALL PERIMETER CONTROLS, INCLUDING TEMPORARY
CONSTRUCTION ENTRANCE, SILT FENCE AND DIVERSION
DIKES. APPLY TEMPORARY SEEDING TO DIVERSIONS AND
SEDIMENT TRAP.
2. BEGIN FILLING OPERATION(S).
3. ONCE SOIL DISPERSAL AREA REACHES FINAL GRADE OR
IS NO LONGER REQUIRED, PERMANENTLY STABILIZE THE
FILL AREA. ANY AREAS THAT REACH FINAL GRADE SOONER
THAN OTHERS SHOULD BE STABILIZED AS SOON AS
PRACTICABLE.
4. ONCE SITE IS PERMANENTLY STABILIZED, REMOVE
TEMPORARY FEATURES, MEASURES AND CONTROLS AND
PERMANENTLY STABILIZE THOSE AREAS ACCORDINGLY.
5. REMOVE PERIMETER CONTROLS ONCE THE PROJECT IS
STABILIZED WITH AN ADEQUATE STAND OF GRASS.
PROJECT SITE NOTES:
1. TEMPORARY SOIL STOCKPILES SHOULD BE SEEDED WITHIN
SEVEN (7) DAYS.
2. ALL TEMPORARY DIVERSION DIKES SHALL BE MAINTAINED
THROUGHOUT THE LIFE OF THE PROJECT.
3. ALL FINAL GRADE ELEVATION CONTOUR LINES ARE
APPROXIMATE IN NATURE AND ARE INTENDED (ONLY) TO
REPRESENT DESIRABLE FILL AND DRAINAGE PATTERNS.
PLAN QUANTITY DEVIATIONS ARE TO BE EXPECTED,
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GROUND
70' MIN.
FILTER CLOTH 6" MIN. A
SIDE ELEVATION
*
12' MIN.
VDOT #1
COURSE AGGREGATE
* MUST EXTEND FULL WIDTH
OF INGRESS AND EGRESS
OPERATION
FILTER CLOTH
EXISTING
PAVEMENT
5:1
MOUNTABLE BERM
(OPTIONAL)
70' MIN.
T B WASHRACK MIN.
(OPTIONAL)
POSITIVE DRAINAGE
® TO SEDIMENT
TRAPPING DEVICE
PLAN VIEW
12' MIN.
SECTION A--A
EXISTING
PAVEMENT
10' MIN.
3" MIN.
3" MIN.
REINFORCED CONCRETE
DRAIN SPACE
TEMPORARY STONE d STONE CONSTRUCTION ENTRANCE PLATE 3.02 -1 C
COMPACTED SOIL
18" min.
FLOW - - - - --
�----°- 4.5' min.
TEMPORARY DIVERSION DIKE
N.T.S. Source: Virginia Erosion and Sediment Control Handbook PLATE 3.09 -1 DD
ORIGINAL
GROUND
ELEV.
SEDIMENT TRAP TOP WIDTH ST
N.T.S. Source: Virginia Erosion and Sediment Control Handbook PLATE 3.13 -1
1. SET THE STAKES.
_s 8'MAX.
FLAW
I
3. STAPLE FILTER MATERIAL
TO STAKES AND EXTEND
IT INTO THE TRENCH.
FLOW
2. EXCAVATE A 4"X 4" TRENCH
UPSLOPE ALONG THE LINE OF STAKES.
r~
4. BACKFILL AND COMPACT
THE EXCAVATED SOIL.
FLOW INSTALLATION
kPERSPECTIVE VIEW)
POINTS A SHOULD BE HIGHER THAN POINT B.
DRAINAGEWAY INSTALLATION
(FRONT ELEVATION)
CONSTRUCTION OF SILT FENCE (WITHOUT WIRE SUPPORT) SF
N.T.S. Source: Virginia Erosion and Sediment Control Handbook PLATE 3.05 -2
ORAGE ELEV.
RAGE ELEV.
CLEANOUT E
ORIGINAL
GROUND
ELEV.
*SEE PLATE 3.13 -1
67 CU. YD. /ACRE
TOP WIDTH
1 VARIABLE
ow ! a
SEDIMENT TRAP DIMENSION TABLE **
SEDIMENT
H HO
W
- Y - - -
1.5 0.5
2.0
CLEANOUT
WET STORAGE
2.0 1.0
2.0
OUTLET
EMBANKMENT
2.5 1.5
2.5
L
W
3.0 2.0
2.5
ELEV. (FT)
ELEV. (FT)
3.5 2.5
3.0
LENGTH
H 0
H 4.0 3.0
3.0
(FT)
(FT)
4.5 3.5
4.0
0
5.0 4.0
4.5
ORIGINAL
GROUND
ELEV.
SEDIMENT TRAP TOP WIDTH ST
N.T.S. Source: Virginia Erosion and Sediment Control Handbook PLATE 3.13 -1
1. SET THE STAKES.
_s 8'MAX.
FLAW
I
3. STAPLE FILTER MATERIAL
TO STAKES AND EXTEND
IT INTO THE TRENCH.
FLOW
2. EXCAVATE A 4"X 4" TRENCH
UPSLOPE ALONG THE LINE OF STAKES.
r~
4. BACKFILL AND COMPACT
THE EXCAVATED SOIL.
FLOW INSTALLATION
kPERSPECTIVE VIEW)
POINTS A SHOULD BE HIGHER THAN POINT B.
DRAINAGEWAY INSTALLATION
(FRONT ELEVATION)
CONSTRUCTION OF SILT FENCE (WITHOUT WIRE SUPPORT) SF
N.T.S. Source: Virginia Erosion and Sediment Control Handbook PLATE 3.05 -2
ORAGE ELEV.
RAGE ELEV.
CLEANOUT E
ORIGINAL
GROUND
ELEV.
*SEE PLATE 3.13 -1
67 CU. YD. /ACRE
TOP WIDTH
1 VARIABLE
ow ! a
SEDIMENT TRAP DIMENSION TABLE **
SEDIMENT
DRAINAGE
LENGTH *,
WIDTH *,
TOTAL
POND
CLEANOUT
WET STORAGE
DRY STORAGE
BERM
OUTLET
EMBANKMENT
TRAP #
AREA (AC)
L
W
DEPTH
BOTTOM
ELEV. (FT)
ELEV. (FT)
ELEV. (FT)
ELEV.
LENGTH
WIDTH (FT)
Q- 0- F--
`1�
�
(FT)
(FT)
FT
ELEV. FT
0
04
(FT)
FT
c
ST -1
2.96
33
50
6
454
455.05
456.06
457.33
6.00
18
2.5
*DIMENSIONS ARE MEASURED AT BOTTOM OF TRAP
DIVERSION DIKE
(IF APPLICABLE)
67 CU. YD. /ACRE 1
4' MAX.
(EXCAVATED)
FILTER CLOTH ORIGINAL
GROUND
ELEV.
COARSE AGGREGATE CLASS I RIPRAP
CROSS SECTION OF OUTLET
CLASS I RIPRAP
(OUTLET LENGTH)
LENGTH (IN FEET) =
6 X DRAINAGE AREA
(IN AC.)
DIVERSION
DIKE
COARSE A GGREGATE
EXCAVATED / / FILTER CLOTH
AREA
* *COARSE AGGREGATE SHALL BE VDOT #3, #357 OR #5
OUTLET (PERSPECTIVE VIEW)
TEMPORARY SEDIMENT TRAP ST
N.T.S. Source: Virginia Erosion and Sediment Control Handbook PLATE 3.13 -2
DIVERSION DIKE
(IF APPLICABLE)
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Tc CALCULATION — DA -1
SHEET FLOW
SHALLOW CONCENTRATED FLOW
CHANNEL FLOW
r
SHEET FLOW
J
0—
SHEET FLOW
• L — 129,
� �
L = 300
• S = 7.8%
0
s 0
Tc = 8.41 MIN.
HYDROLOGY SUMMARY
Tc 37.55 MIN,
SHALLOW CONCENTRATED FLOW
� N
SHALLOW CONCENTRATED FLOW
d L = 356'
• DA -1 WILL EXPERIENCE A SLIGHT DECREASE IN FLOWRATE DUE TO THE SLIGHT
L = 298
• S = 8.4% UNPAVED
INCREASE IN TIME OF CONCENTRATION FROM FLATTENING THE FINISHED GRADE
0 S = 10.0% UNPAVED
• Tc = 1.31 MIN.
NEAR THE TOP OF THE DRAINAGE AREA. A CONSTANT C— FACTOR WAS
• Tc = 0.97 MIN.
CONSERVATIVELY USED.
�z�
CHANNEL FLOW
CHANNEL FLOW
L = 236'
• • L = 2. MIN.
• IT HAS BEEN DETERMINED THAT MINIMUM STANDARD 19(MS -19) HAS BEEN
L = 160
SATISFIED. THE EXISTING OUTFALL CHANNEL IS NOW RECEIVING LESS FLOW
• Tc = 1.37 MIN
TOTAL Tc = 8.41 MIN
THAN IN THE PRE — DEVELOPMENT CONDITION DUE TO FLATTENING THE FINISHED
r14
TOTAL Tc = 39.9 MIN.
GRADE NEAR THE TOP OF THE DRAINAGE AREA, AND IS THEREFORE DEEMED
FLOWRATE, Q = CIA
ADEQUATE. FOR ADDITIONAL CONFIRMATION, THE EXISTING CHANNEL WILL NOT
FLOWRATE, Q = CIA
OVERTOP IN THE 10 —YEAR EVENT (LESS THAN 0.11 FT DEPTH) AND THE
Q2 = 4.209 CFS
2 —YEAR, POST — DEVELOPMENT VELOCITY IS 1.97 FPS (LESS THAN ALLOWABLE
Q2 = 2.061 CFS
=
Q10 5.845 CFS
VELOCITY OF 4 FPS).
Qio = 2.986 CFS
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