HomeMy WebLinkAboutWPO201900038 Plan - VSMP 2020-09-280
GENERAL NOTES MARTHA JEFFERSON HOSPITAL
OWNER/DEVELOPER:
MARTHA JEFFERSON HOSPITAL C/O SENTARA HEALTHCARE
6015 POPLAR HALL DRIVE, SUITE 214
NORFOLK, VA 23502
ENGINEER:
COLLINS ENGINEERING
200 GARRETT ST, SUITE K
CHARLOTTESVILLE,VA 22902
(434)293-3719
TAX MAP NO.:
07800-00-00-02OM4 DB 4935 PG SOO
TOTAL PROJECT AREA:
38.49 ACRES TOTAL (PROJECT AREA = 1.45 AC)
ZONING:
PLANNED DEVELOPMENT MIXED COMMERCIAL WITH PROFFERS (ZMA 01-015),
PRESERVED AND MANAGED STEEP SLOPES OVERLAY AREA. 100 YR FLOODPLAIN
OVERLAY DISTRICT
TOPO & SURVEY:
SURVEY PROVIDED BY ROUDABUSH & GALE DATED JUNE, 2017. TOPOGRAPHY IS
AERIAL SURVEY PERFORMED BY VIRGINIA RESOURCE MAPPING DATED JANUARY,
2011. TOPO FIELD VERIFIED BY COLLINS ENGINEERING IN JANUARY 2019.
DATUM:
NAD83, NAVD 88
EXISTING TERRAIN:
GRASS LANDSLIDE BERM AND OPEN SPACE AREAS FOR THE USE OF THE HOSPITAL
WITH A PEDESTRIAN TRAIL.
PROPOSED:
PARKING LOT ADDITION TO SERVE THE CANCER TREATMENT WING OF THE
HOSPITAL
WATER SUPPLY PROTECTION AREA: NOT APPLICABLE WITH THIS SITE PLAN AMENDMENT
WATERSHED / WATER RESOURCE AREA: RIVANNA RIVER DRAINAGE BASIN
DENSITY:
NOT APPLICABLE WITH THIS SITE PLAN AMENDMENT
GREENWAY DEDICATION:
NOT APPLICABLE WITH THIS SITE PLAN AMENDMENT
BUILDING HEIGHTS:
NOT APPLICABLE WITH THIS SITE PLAN AMENDMENT
SETBACKS:
NOT APPLICABLE WITH THIS SITE PLAN AMENDMENT
SUBDIVISION STREETS:
CURB & GUTTER
UTILITIES (WATER AND SEWER): COUNTY PUBLIC WATER AND SANITARY SEWER
AGRICULTURAL/FORESTAL
DISTRICT: NONE
LIGHTING:
PARKING LOT LIGHTING AS SHOWN ON THIS AMENDMENT PLAN. LIGHTING SHALL
CONFORM TO ALBEMARLE COUNTY LIGHTING AND DARK SKY ORDINANCE.
LANDSCAPING:
A LANDSCAPING PLAN AS SHOWN HAS BEEN DESIGNED IN ACCORDANCE WITH
ALBEMARLE COUNTY ORDINANCE SECTION 32.7.9.
TRASH RECEPTACLES:
NOT APPLICABLE WITH THIS SITE PLAN AMENDMENT
PHASING:
THIS SITE SHALL BE DEVELOPED IN ONE PHASE.
PARKING:
OVERALL MARTHA JEFFERSON HOSPITAL PARKING CALCULATION (THROUGH
SDP201500062):
NUMBER OF PARKING SPACES CONSTRUCTED: 1,958 SPACES
NUMBER OF PARKING SPACES REMOVED IN SDP2015-00062: 31 SPACES
NUMBER OF PARKING SPACES REMOVED IN THIS PLAN: 19 SPACES
NUMBER OF PARKING SPACES ADDED IN THIS PLAN: 66 SPACES
TOTAL NUMBER OF PARKING SPACES REQUIRED W/ POB: 1,641 SPACES
TOTAL NUMBER OF PARKING SPACES: 1,974 SPACES
NOTE: A 20% INCREASE OVER THE REQUIRED PARKING IS ALLOWED PER THE
ALBEMARLE COUNTY ZONING ORDINANCE. THE TOTAL ALLOWABLE PARKING
(INCLUDING A 20% INCREASE) IS 1,969 SPACES. THIS SITE PLAN WILL EXCEED
THE TOTAL ALLOWABLE PARKING BY (5) SPACES. THEREFORE, (5) EXISTING
SPACES WITHIN THE EXISTING MJH HOSPITAL PARKING LOT WILL NEED TO BE
STRIPED FOR NO PARKING OR REALLOCATED FOR ANOTHER USE, SUCH AS
TRAILHEAD PARKING SPACE FOR THE COUNTY AND PUBLIC TO ACCESS THE
RIVANNA TRAILS.
STREAM BUFFERS/FLOODPLAIN: NOT APPLICABLE WITH THIS SITE PLAN AMENDMENT
RETAINING WALLS:
NO RETAINING WALLS ARE PROPOSED WITH THIS PLAN
RECREATION:
NOT APPLICABLE WITH THIS SITE PLAN AMENDMENT
LAND AREA:
PARKING AND TRAVELWAYS 0.52 AC. (35.8%)
SIDEWALKS: 0.03 ACRES (2.1%)
IMPERVIOUS AREAS (WITHIN LIMITS OF PROJECT AREA): EXISTING PROPOSED
PARKING AREAS AND TRAVELWAYS: 15,330 SF 22,885 SF
SIDEWALKS: 3,690 SF 1,400 SF
TOTAL:
19,020 SF 24,285 SF
PAVED PARKING AND CIRCULATION AREA: 38,215 SF
CRITICAL SLOPES:
NO STEEP SLOPES ARE WITHIN THE LIMITS OF THE PROJECT AREA.
BURIAL SITES:
NO CEMETERIES WERE FOUND DURING FIELD INVESTIGATION OF THE SITE
WITHIN THE LIMITS OF THE PROJECT AREA.
STORMWATER MANAGEMENT:
A DRY STORMWATER MANAGEMENT DETENTION CELL AND WATER QUALITY
SWALES SHALL BE CONSTRUCTED AS SHOWN ON THE GRADING AND DRAINAGE
PLAN. ADDITIONAL WATER QUALITY NUTRIENT CREDITS AND/OR SWIM
DEDICATED PRESERVATION AREA MAY BE REQUIRED TO ACHIEVE THE NECESSARY
REMOVAL RATES FOR THE DEVELOPMENT. A FINAL WPO AND VSMP PLAN SHALL BE
SUBMITTED FOR REVIEW AND APPROVAL, PRIOR TO LAND DISTURBING
OPERATIONS AND PRIOR TO FINAL SITE PLAN APPROVAL.
SITE PLAN SUMMARY:
ORIGINAL SITE PLAN: SDP-2008-16 - ORIGINAL MARTHA JEFFERSON HOSPITAL SITE PLAN
SITE PLAN AMENDMENT #1: SDP-2008-00088 - PARKING LOT MODIFICATION AT WILLIS ROAD AND
STATE FARM BOULEVARD
SITE PLAN AMENDMENT #2: SDP-2008-00187 - SIDEWALK MODIFICATION AROUND SWM FACILITY
AND SIDEWALK CONNECTION TO STATE FARM BOULEVARD
SITE PLAN AMENDMENT #3: SDP-2010-00050 - AMPHITHEATER SITE PLAN
MAJOR SITE PLAN: SDP-2009-00090 - MAJOR SITE PLAN FOR MARTHA JEFFERSON HOSPITAL AND
ADDITION OF THE PARKING GARAGE
SITE PLAN AMENDMENT #1: SDP-2011-00023 - LANDSCAPING PLAN FOR THE MARTHA JEFFERSON
HOSPITAL CAMPUS
SITE PLAN AMENDMENT #2: SDP-2015-00062 - MINOR SITE PLAN AMENDMENT FOR THE HELIPAD
PARKING LOT EXPANSION
VSMP PLAN (WP0201900038)
11%
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RIVANNA MAGISTERIAL DISTRICT
ALBEMARLE COUNTY, VIRGINIA
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DROP INLET & STRUCTURE NO.
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EXISTING CONTOUR
SHEET INDEX
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TITLE
SHEET
COVER
1
EXISTING CONDITIONS
2
I
EROSION & SEDIMENT CONTROL NARRATIVE
3
PHASE I EROSION & SEDIMENT CONTROL PLAN
4
PHASE II EROSION & SEDIMENT CONTROL PLAN
5
STORMWATER MANAGEMENT PLAN
6
/
STORMWATER MANAGEMENT DETAILS
7
TOTAL SHEETS
7
NOTES:
CONTRACTOR SHALL VERIFY LOCATION AND ELEVATION OF ALL UNDERGROUND
UTILITIES SHOWN ON PLANS IN AREAS OF CONSTRUCTION PRIOR TO STARTING
WORK. CONTACT ENGINEER IMMEDIATELY IF LOCATION OR ELEVATION IS DIFFERENT
FROM THAT SHOWN ON THE PLANS, IF THERE APPEARS TO BE A CONFLICT, AND
UPON DISCOVERY OF ANY UTILITY NOT SHOWN ON THE PLANS.
THE CONTRACTOR MUST LOCATE ALL SURFACE AND SUB -SURFACE UTILITIES PRIOR
TO ANY WORK ONSITE.
ANY SIDEWALK AND/OR CURB DAMAGE IDENTIFIED IN THE SITE VICINITY DUE TO
PROJECT CONSTRUCTION ACTIVITIES AS DETERMINED BY THE VDOT INSPECTOR
SHALL BE REPAIRED AT THE CONTRACTOR'S EXPENSE. SIDEWALK WILL BE
REPLACED AT THE DIRECTION OF THE VDOT INSPECTOR. ANY EXISTING SIDEWALK
THAT IS CURRENTLY DAMAGED AND IN NEED OF REPAIR OR NOT IN COMPLIANCE
WITH CURRENT STANDARDS SHOULD BE REPLACED AS PART OF THIS PROJECT AS
WELL. IN ADDITION, ANY EXISTING CG-12S ALONG THE PERIMETER OF THE SITE
SHOULD BE UPGRADED TO MEET CURRENT STANDARD IF NEEDED.
ALL SIGNING AND PAVEMENT MARKINGS SHALL BE CONSISTENT WITH THE MUTCD.
APPROVALS DATE
DEPARTMENT OF COMMUNITY DEVELOPMENT
PLANNER/ZONING
ENGINEER
INSPECTIONS
ARB
DEPARTMENT OF FIRE RESCUE
ALBEMARLE COUNTY SERVICE AUTHORITY
VIRGrNIA DEPARMENT OF TRANSPORTATION
HEALTH DEPARTMENT
SCOTT/R. CITLLINS'Z
No. 35791 11-
09/08/20
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d\ \GENERAL NOTES: \ \\/ ( \ \ \ / \ ° GL \ \ \ \ \ ��� \TH 0F�✓
1. NO FLOODPLAIN EXISTS ON THE SUBJECT SITE PER FEMA
FLOODPLAIN MAPS # 51003CO289D.
2. NO STREAM BUFFER EXISTS ON THE SUBJECT PROPERTY. \ Os \\/ / / \ �_ l \ S \ ��� \
\ \ \ SCOTT R. LLINS Z
3. BEFORE BEGINNING SITE WORK, THE CONTRACTOR SHALL S / 1 C c ,� O
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INVESTIGATE AND VERIFY THE EXISTENCE AND LOCATION OF Q a
UNDERGROUND UTILITIES, MECHANICAL AND ELECTRICAL SYSTEMS, \ \ � \ \ \ ` ' ��i =� 0� 09/08/20 w
AND OTHER CONSTRUCTION AFFECTING THE WORK. BEFORE _� \ \ olp
\ \\ CONSTRUCTION THE CONTRACTOR SHALL VERIFY THE LOCATION \ \ \ a / ll// SSIONAL S
AND INVERT ELEVATIONS AT POINTS OF CONNECTION OF SANITARY \ / +
SEWER, STORM SEWER, AND WATER -SERVICE PIPING; \
\ UNDERGROUND ELECTRICAL SERVICES, AND OTHER UTILITIES. THE / \
\ CONTRACTOR SHALL FURNISH LOCATION DATA FOR WORK RELATED - / / \ ( ° \ \ \
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TO PROJECT THAT MUST BE PERFORMED BY PUBLIC UTILITIES ' / / / /EXISTING 4' CONCRETE WALKWAY s
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EROSION & SEDIMENT CONTROL MEASURES:
STRUCTURAL EROSION AND SEDIMENT CONTROL PRACTICES SHALL BE IN ACCORDANCE WITH THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK.
STRUCTURAL PRAC7CES USED IN THIS SECTION CONSIST OF THE FOLLOWING:
3.01 SAFETY FENCE:
A PROTEC77VE BARRIER INSTALLED TO PREVENT ACCESS TO AN EROSION CONTROL MEASURE. TO PROHIBIT THE UNDESIRABLE USE OF AN EROSION CONTROL MEASURE
BY THE PUBLIC. APPLICABLE TO ANY CONTROL MEASURE OR SERIES OF MEASURES WHICH CAN BE CONSIDERED UNSAFE BY VIRTUE OF P07ENTIAL ACCESS BY THE
PUBLIC.
3.02 CONSTRUCTION ENTRANCE:
A STABILIZED PAVED CONSTRUCTION ENTRANCE WI7H A WASH RACK LOCATED AT POINTS OF VEHICULAR INGRESS AND EGRESS ON A CONSTRUC7ON SITE TO REDUCE
THE AMOUNT OF MUD TRANSPORTED ONTO PAVED PUBLIC ROADS BY MOTOR VEHICLES OR RUNOFF. CONSTRUCTION EN7RANCES SHALL BE INSTALLED AS SHOWN ON THE
PLANS TO REDUCE THE AMOUNT SEDIMENT TRANSPORTED ONTO PUBLIC ROADWAYS.
3.05 SILT FENCE:
A TEMPORARY SEDIMENT BARRIER CONSISTING OF A SYNTHETIC FILTER FABRIC STRETCHED ACROSS AND ATTACHED TO SUPPORTING POSTS AND ENTRENCHED, TO
INTERCEPT AND DETAIN SMALL AMOUNTS OF SEDIMENT FROM DISTURBED AREAS DURING CONSTRUC7ON OPERATIONS IN ORDER TO PREVENT SEDIMENT FROM LEAVING THE
SITE, AND TO DECREASE 7HE VELOCITY OF SHEET FLOWS AND LOW-TO-MODERA7E LEVEL CHANNEL FLOWS. THE SILT FENCE BARRIERS SHALL BE INSTALLED DOWN SLOPE
OF AREAS WITH MINIMAL GRADES TO FILTER SEDIMENT LADEN RUNOFF FROM SHEET FLOW AS INDICATED. THEY SHALL BE INSPECTED IMMEDIATELY AFTER EACH RAINFALL
AND MAINTAINED IN ACCORDANCE WITH THE VIRGINIA EROSION & SEDIMENT CONTROL HANDBOOK (VESCH).
3.07 STORM DRAIN INLET PROTECTION:
A SEDIMENT FILTER OR AN EXCAVATED IMPOUNDING AREA AROUND A STORM DRAIN DROP INLET OR CURB INLET. TO PREVENT SEDIMENT FROM ENTERING STORM
DRAINAGE SYSTEMS PRIOR TO PERMANENT STABILIZATION OF THE DISTURBED AREA. INLET PROTECTION APPLIES WHERE STORM DRAIN INLETS ARE TO BE MADE
OPERATIONAL BEFORE PERMANENT STABILIZATION OF THE CORRESPONDING DISTURBED DRAINAGE AREA.
3.09 TEMPORARY DIVERSION DIKE.•
A TEMPORARY RIDGE OF COMPACTED SOIL CONSTRUCTED AT THE TOP OR BASE OF A SLOPING DISTURBED AREA. TO DIVERT STORM RUNOFF FROM UPSLOPE DRAINAGE
AREAS AWAY FROM UNPROTECTED DISTURBED AREAS AND SLOPES TO A STABILIZED OUTLET. TO DIVERT SEDIMENT -LADEN RUNOFF FROM A DISTURBED AREA TO A
SEDIMENT -TRAPPING FACILITY SUCH AS A SEDIMENT TRAP OR SEDIMENT BASIN. USE WHEREVER STORMW47ER RUNOFF MUST BE TEMPORARILY DIVERTED TO PROTECT
DISTURBED AREAS AND SLOPES OR RETAIN SEDIMENT ON SITE DURING CONSTRUCTON. THESE STRUCTURES GENERALLY HAVE A LIFE EXPECTANCY OF 18 MONTHS OR
LESS, WHICH CAN BE PROLONGED WITH PROPER MAINTENANCE.
3.12 DIVERSION:
A CHANNEL CONSTRUCTED ACROSS A SLOPE WITH A SUPPOR7NG EARTHEN RIDGE ON THE LOWER SIDE. TO REDUCE SLOPE LENGTH AND TO INTERCEPT AND DIVERT
STORMWATER RUNOFF TO STABILIZED OUTLETS AT NON -EROSIVE VELOCITIES. APPLIES WHERE RUNOFF FROM AREAS OF HIGHER ELEVATION MAY DAMAGE PROPERTY,
CAUSE EROSION, OR INTERFERE WITH 7HE ESTABLISHMENT OF VEGETATION ON LOWER AREAS, WHERE SURFACE AND/OR SHALLOW SUBSURFACE FLOW IS DAMAGING
SLOPING UPLAND, AND WHERE THE SLOPE LENGTH NEEDS TO BE REDUCED TO MINIMIZE SOIL LOSS.
313 TEMPORARY SEDIMENT TRAP:
A TEMPORARY PONDING AREA FORMED BY CONSTRUC7NG AN EARTHEN EMBANKMENT WITH A STONE OUTLET. TO DETAIN SEDIMENT -LADEN RUNOFF FROM SMALL
DISTURBED AREAS LONG ENOUGH TO ALLOW THE MAJORITY OF THE SEDIMENT TO SETTLE OUT. USE BELOW DISTURBED AREAS WHERE THE TOTAL CONTRIBUTING
DRAINAGE AREA IS LESS THAN 3 ACRES, WHERE THE SEDIMENT TRAP WILL BE USED NO LONGER 7HAN 18 MONTHS, AND IT MAY BE CONSTRUCTED EITHER INDEPENDENTLY
OR IN CONJUNCTION WITH A TEMPORARY DIVERSION DIKE.
3.14 TEMPORARY SEDIMENT BASIN:
A TEMPORARY BARRIER OR DAM WITH A CONTROLLED STORMWATER RELEASE STRUCTURE FORMED BY CONS7RUCT7NG AN EMBANKMENT OF COMPACTED SOIL ACROSS A
DRAINAGEWAY. TO DETAIL SEDIMENT -LADEN RUNOFF FROM DISTURBED AREAS IN "WET" AND `DRY" STORAGE LONG ENOUGH FOR THE MAJORITY OF THE SEDIMENT TO
SETTLE OUT. APPLIES BELOW DISTURBED AREAS WHERE THE TOTAL CONTRIBUTING DRAINAGE AREA IS EQUAL TO OR GREATER THAN THREE ACRES THERE MUST BE
SUFFICIENT SPACE AND APPROPRIATE TOPOGRAPHY FOR THE CONSTRUC7ON OF A TEMPORARY IMPOUNDMENT.
318 OUTLET PROTECTION.,
STRUCTURALLY LINED APRONS OR 07HER ACCEPTABLE ENERGY DISSIPATING DEVICES PLACED AT THE OUTLETS OF PIPES OR PAVED CHANNEL SECTIONS. TO PREVENT
SCOUR AT STORMWATER OUTLETS TO PROTECT 7HE OUTLET STRUCTURE, AND TO MINIMIZE THE P07ENTIAL FOR DOWNSTREAM EROSION BY REDUCING THE VELOCITY AND
ENERGY OF CONCEN7RATED STORMW47ER FLOWS. APPLICABLE TO THE OUTLETS OF ALL PIPES AND ENGINEERED CHANNEL SECTIONS.
319 RIPRAP:
A PERMANENT, EROSION -RESISTANT GROUND COVER OF LARGE, LOOSE, ANGULAR STONE WITH FILTER FABRIC OR GRANULAR UNDERLINING. TO PROTECT THE SOIL FROM
THE EROSIVE FORCES OF CONCENTRATED RUNOFF, SLOW THE VELOCITY OF CONCENTRATED RUNOFF WHILE ENHANCING THE POTENTIAL FOR INFILTRATION, AND TO
STABILIZE SLOPES WITH SEEPAGE PROBLEMS, AND/OR NON -COHESIVE SOILS. USE WHEREVER SOIL AND WATER INTERFACE AND THE SOIL CONDITIONS, WATER TURBULENCE
AND VELOCITY, EXPECTED VEGETATIVE COVER, ETC., ARE SUCH THAT THE SOIL MAY ERODE UNDER THE DESIGN FLOW CONDITIONS.
3.20 ROCK CHECK DAMS:
SMALL TEMPORARY STONE DAMS CONSTRUCTED ACROSS A SWALE OR DRAINAGE DITCH. TO REDUCE THE VELOCITY OF CONCENTRATED STORMWATER FLOWS, THEREBY
REDUCING EROSION OF THE SWALE OR DITCH. THIS PRAC77CE ALSO TRAPS SEDIMENT GENERATED FROM ADJACENT AREAS OR THE DITCH ITSELF, MAINLY BY PONDING OF
THE STORMWATER RUNOFF. THIS PRACTICE, U77LIZING A COMBINATION OF STONE SIZES, IS LIMITED TO USE IN SMALL OPEN CHANNELS WHICH DRAIN 10 ACRES OR LESS.
3.31 TEMPORARY SEEDING:
THE ESTABLISHMENT OF A TEMPORARY VEGETA7VE COVER ON DISTURBED AREAS BY SEEDING WITH APPROPRIATE RAPIDLY GROWING ANNUAL PLANTS. TO REDUCE
EROSION AND SEDIMENTAT70N BY STABILIZING DISTURBED AREAS THAT WILL NOT BE BROUGHT TO FINAL GRADE FOR A PERIOD OF MORE THAN 30 DAYS. TO REDUCE
DAMAGE FROM SEDIMENT AND RUNOFF TO DOWNSTREAM OR OFF-S/7E AREAS, AND TO PROVIDE PR07FC770N TO BARE SOILS EXPOSED DURING CONS7RUC77ON UNTIL
PERMANENT VEGETAT70N OR OTHER EROSION CONTROL MEASURES CAN BE ESTABLISHED.
3.32 PERMANENT STABILIZATION:
THE ESTABLISHMENT OF PERENNIAL VEGETATIVE COVER ON DISTURBED AREAS BY PLANTING SEED. TO REDUCE EROSION AND DECREASE SEDIMENT YIELD FROM DISTURBED
AREAS. TO PERMANENTLY STABILIZE DISTURBED AREAS IN A MANNER THAT IS ECONOMICAL, ADAPTABLE TO SITE CONDITONS, AND ALLOWS SELECTION OF THE MOST
APPROPRIATE PLANT MATERIALS. TO IMPROVE WILDLIFE HABITAT. TO ENHANCE NATURAL BEAUTY. UPON COMPLETION OF CONSTRUCTION ACTIW7ES, ALL AREAS WILL
RECEIVE A PERMANENT VEGETA77VE COVER.
3.35 MULCHING.
APPLICA7ON OF PLANT RESIDUES OR OTHER SUITABLE MA7ERIALS TO THE SOIL SURFACE. TO PREVENT EROSION BY PROTEC77NG THE SOIL SURFACE FROM RAINDROP
IMPACT AND REDUCING THE VELOCITY OF OVERLAND FLOW. TO FOSTER THE GROWTH OF VEGETATION BY INCREASING AVAILABLE MOISTURE AND PROVIDING INSULA77ON
AGAINST EXTREME HEAT AND COLD. AREAS WHICH HAVE BEEN PERMANENTLY SEEDED SHOULD BE MULCHED IMMEDIATELY FOLLOWING SEEDING. AREAS WHICH CANNOT
BE SEEDED BECAUSE OF THE SEASON SHOULD BE MULCHED USING ORGANIC MULCH. MULCH MAY BE USED TOGETHER WITH PLAN77NGS OF TREES SHRUBS OR CERTAIN
GROUND COVERS WHICH DO NOT PROVIDE ADEQUATE SOIL STABILIZATION BY THEMSELVES, CAN BE USED IN CONJUNCTION WITH TEMPORARY SEEDING.
337 TREES SHRUBS. VINES & GROUND COVERS:
STABILIZING DISTURBED AREAS BY ESTABLISHING VEGETA7VE COVER WITH 7REES, SHRUBS, VINES, OR GROUND COVERS. TO AID IN STABILIZING SOIL IN AREAS WHERE
VEGETATION OVER THAN TURF IS PREFERRED, TO PROVIDE FOOD AND SHELTER FOR WILDLIFE WHERE WILDLIFE HABITAT 1S DESIRABLE. APPLIES IN AREAS WHERE TURF
ESTABLISHMENT IS DIFFICULT ON STEEP OR ROCKY SLOPES WHERE MOWING IS NOT FEASIBLE WHERE ORNAMENTALS ARE DESIRABLE FOR LANDSCAPING PURPOSES AND
WHERE WOODY PLANTS ARE DESIRABLE FOR SOIL CONSERVATION, OR TO ESTABLISH WILDLIFE HABITAT.
3.38 TREE PRESERVA77ON AND PROTECTION.
PROTECT70N OF DESIRABLE TREES FROM MECHANICAL OR OTHER INJURY DURING LAND DISTURBING AND CONSTRUCTION ACT7WTY. TO ENSURE THE SURVIVAL OF
DESIRABLE TREES WHERE THEY WILL BE EFFECTIVE FOR EROSION AND SEDIMENT CONTROL, WATERSHED PROTECTION, LANDSCAPE BEAUTIFICATION, DUST AND POLLUTION
CONTROL, NOISE REDUCTION, SHADE AND OTHER ENVIRONMENTAL BENEFITS WHILE THE LAND IS BEING CONVERTED FROM FOREST TO URBAN -TYPE USES. APPLIES IN
TREE -INHABITED AREAS SUBJECT TO LAND DISTURBING ACTIVITIES
3.39 DUST CONTROL:
REDUCING SURFACE AND AIR MOVEMENT OF DUST DURING LAND DISTURBING, DEMOLITION AND CONSTRUC7ON ACTIVITIES TO PREVENT SURFACE AND AIR MOVEMENT OF
DUST FROM EXPOSED SOIL SURFACES AND REDUCE THE PRESENCE OF AIRBORNE SUBSTANCES WHICH MAY PRESENT HEALTH HAZARDS, TRAFFIC SAFETY PROBLEMS OR
HARM ANIMAL OR PLANT LIFE. DUST CON7ROL MEASURES SHALL BE EMPLOYED TO PREVENT SURFACE AND AIR MOVEMENT OF DUST DURING CONSTRUCTION. MEASURES
EMPLOYED SHALL BE IN ACCORDANCE WITH THE VESCH.
11ROINIA EROSION & SEDIMENT
EROSION CONTROL * HANDBOOK SPECIFICATION NUMBER CONTROL LEGEND
* ROADS
STB ® STRAW BAIL BARRIER 3.04
L�-� EXISTNG CULVERT
08MOMMOM TEMPORARY DIVERSION DIKE 3.09 CULVERT
ST t -. > TEMPORARY SEDIMENT TRAP 3.13 F Q DROP INLET & STRUCTURE NO.
CURB
& ® SEDIMENT BASIN 3.14 71 CURB & GUTTER
IP � INLET PROTECTION 307 PROPOSED PAVEMENT
SF X SILT FENCE 3.05 EC-3A DITCH
6"
DEPTH OF EC-3A DITCH
CE CONSTRUCTION ENTRANCE 3.02
EC-2 DITCH
CD ' CHECK DAM 3.20 g DEPTH OF EC-2 DITCH
_ EARTH DITCH
a � TEMPORARY FILL DIVERSION 3.10 -.,,
® DRI VEWA Y CUL VERT
DV 01 DIVERSION 3.12 + BENCH MARK
CLEARING LIMITS
EROSION CONTROL NOTES
ES-1: UNLESS OTHERWISE INDICATED, ALL VEGETATIVE AND STRUCTURAL EROSION
AND SEDIMENT CONTROL PRACTICES WILL BE CONSTRUCTED AND MAINTAINED
ACCORDING TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE VIRGINIA
EROSION AND SEDIMENT CONTROL HANDBOOK AND VIRGINIA REGULATIONS VR
625-02-00 EROSION AND SEDIMENT CONTROL REGULATIONS.
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.
ES-3.•ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR
TO OR 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 ACT7077ES IN AREAS OTHER THAN
INDICATED ON THESE PLANS (INCLUDING BUT NOT LIMITED TO, OFF -SITE
BORROW OR WASTE AREAS), THE CONTRACTOR SHALL SUBMIT A
SUPPLEMENTARY EROSION CONTROL PLAN TO THE OWNER FOR REVIEW AND
APPROVAL BY THE PLAN APPROVING AUTHORITY.
ES-6: THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY ADDIT70NAL
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.
ES-8. DURING DEWATERING OPERATONS, WATER WILL BE PUMPED INTO AN
APPROVED WATER FILTERING DEVICE.
ES-9: THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES
PERIODICALLY AND AFTER EACH RUNOFF -PRODUCING RAINFALL EVENT. ANY
NECESSARY REPAIRS OR CLEANUP TO MAINTAIN THE EFFEC77VENESS OF THE
EROSION CONTROL DEVICES SHALL BE MADE IMMEDIATELY.
General construction notes for Erosion and Sediment Control plains
1. The plan approving authority must be notified one week prior to the pre -construction
conference, one week prior to the commencement of land disturbing activity, and one week
prior to the final inspection.
2. All erosion and sediment control measures will be constructed and maintained according to
minimum standards and specifications of the Virginia Erosion and Sediment Control
Handbook and Virginia Regulations VR 625-02-00 Erosion and Sediment Control
Regulations.
3. All erosion and sediment control measures are to be placed prior to or as the first step in
clearing.
4. A copy of the approved erosion and sediment control plan shall be maintained on the site at
all times.
5. Prior to commencing land disturbing activities in areas other than indicated on these plans
(including, but not limited to, off -site borrow or waste areas), the contractor shall submit a
supplementary erosion control plan to the owner for review and approval by the plan
approving authority.
6. The contractor is responsible for installation of any additional erosion control measures
necessary to prevent erosion and sedimentation as determined by the plan approving
authority.
7. All disturbed areas are to drain to approved sediment control measures at all times during
land disturbing activities and during site development until final stabilization is achieved.
8. During dewatering operations, water will be pumped into an approved filtering device.
9. The contractor shall inspect all erosion control measures periodically and after each runoff -
producing rainfall event. Any necessary repairs or cleanup to maintain the effectiveness of
the erosion control devices shall be made immediately.
10. All fill material to be taken from an approved, designated borrow area.
11. All waste materials shall be taken to an approved waste area.. Earth fill shall be inert
materials only,free of roots stumps, wood rubbish and other debris.
P .
12. Borrow or waste areas are to be reclaimed within 7 days of completion per Zoning
Ordinance section 5.1.28.
13. All inert materials shall be transported in compliance with section 13-301 of the Cale of
Albemarle.
14. Borrow, fill or waste activity involving industrial -type power equipment shall be limited to
the hours of 7:00am to 9:00pm.
15. Borrow, fill or waste activity shall be conducted in a safe manner than maintains lateral
support, or order to minimize an hazard to persons. physical damage to adjacent land and
PP Y P P Y g J
improvements, and damage to any public street because o slides, sinking, or collapse.
16. The developer shall reserve the right to install maintain remove or convert to permanent
P
stormwater management facilities where applicable all erosion control measures required
g aPP 9
b this lanre regardless of the sale of an lot unit building or other portion of theproperty.
Y P g Y � g Po
17. Temporary stabilization shall be temporary seeding and mulching. Seeding is to be at 75
lbs/acre and in the months of September to February to consist a 50150 mix of Annual
P azY
Ryegrass and Cereal Winter Rye, or in March and April to consist of Annual Rye, or May
through August to consist of German Millet. Straw mulch is to be applied at 80lbs/100sf.
Alternatives are subject to approved by the County erosion control inspector.
18. Permanent stabilization shall be lime and fertilizer, permanent seeding, and mulch.
Agricultural grade limestone shall be applied at 90lbs/1000sf, incorporated into the to 4-6
g g PP rP P
inches of soil. Fertilizer shall be applied at 10001bs/acre and consist of a 10-20-10 nutrient
mix. Permanent seeding shall be applied at 180lbs/acre and consist of 95%D Kentucky 31 or
Tall Fescue and 0-5% Perennial Ryegrass or Kentucky Bluegrass. Straw mulch is to be
applied at 80lbs/100sf. Alternatives are subject to approved by the County erosion control
inspector.
19. Maintenance: All measures are to be inspected weekly and after each rainfall. Any damage
or clogging to structural measures is to be repair immediately. Silt traps are to be cleaned
when 50% of the wet storage volume is filled with sediment. All seeded areas are to be
reseeded when necessary to achieve a good stand of grass. Silt fence and diversion dykes
which are collecting sediment to half their height must be cleaned and repaired
immediately.
20. All temporary erosion and sediment control measures are to be removed within 30 days of
final site stabilization when measures are no longer needed subject to approval b the
g J PPr Y
County erosion control inspector.
21. This plan shall be void if the owner does not obtain a permit within 1 year of the date of
approval. (Water Protection Ordinance section 17-204G.)
22. Permanent vegetation shall be installed on all denuded areas within nine (9) months after
the date the land disturbing activity commenced. (Water Protection Ordinance section 17-
207B)
PS
O
PS
�
PERMANENT SEEDING
J.
SOIL DESCRIPTION
T
VDOT STANDARD STOP SIGN
72C3 - CLAY -SEVERELY
TO
TO
TOPSOILING
3.30
_ _ _ _200_ _ _
_ EXISTING CONTOUR
ERODERABUN
ERODED, 79' SLOPES.
W
THESE DEEP, WELLL D DRAINED
IP
O
CULVERT INLET PROTECTION
J.
PROPOSED CONTOUR
SOILS ARE FOUND ON GENTLY
SLOPING TO STEEP RIDGES
20O
AND MOUNTAIN SLOPES.
240.55
PROPOSED SPOT ELEVATION
MODERATE TO RAPID RUNOFF,
DC
DC
DUST CONTROL
J.
TBC DENOTES TOP/BACK OF
CURB
WITH MODERATE PERMEABILITY.
T/B DENOTES TOP OF BOX
TSD
TEMPORARY SLOPE DRAIN
3.15
0
GENERAL SLOPE (3:1 OR LESS)
TOTAL LBS
PER ACRE
SA
SAFETY FENCE
3D1
KENTUCKY 31 FESCUE
128 LBS
RED TOP GRASS
2 LBS
SEASONAL NURSE CROP
20 LBS
TEMPORARY RIGHT-OF-WAY
3.11
150 LBS
DIVERSION
SEASONAL NURSE CROP
FEBRUARY 16 THROUGH APRIL
ANNUAL
RYE
TARLR JJI-a
ACCEPTABLE TEMPORARY SERDINO PI MATERIALS
'QUICK REFERENCE FOR ALL REGIONS•
Rart
Mari nu Mr. . AxIdo
Sept. I - Feb. 15 50150 My of
Mn" R,yeynu
(Inlum Iwnomml
& 50 - 100
C .l (Winter) Rye
o owal.,
Feb. 16 - Apr. M A Ryewa.s N - 1m
(Julium i-nomm)
May l-Au631 Germ®Mill. 5e
(5etarialta0ea)
TABLE 331-A
LIMING REQUIREMENTS
FOR TEMPORARY SITES
Recommended Application
pH Test of AW ulrnra Limestone
below 42 3 tons per acre
4.2 to 5.2 2 tot¢ per acre
52 to 6 1 ton per acre
Source: Va. DSWC
MAY 1 THROUGH AUGUST 15 FOXTAIL MILLET
AUGUST 16 THROUGH OCTOBER ANNUAL RYE
NOVEMBER THROUGH FEBRUARY 15 WINTER RYE
NOTES:
1. LIME AND FERTILIZER NEEDS SHALL BE DETERMINED BY SOIL
TESTS AND APPLIED IN ACCORDANCE WITH VESCH STD. 3.32.
2. SEEDINGS TO BE MULCHED IMMEDIATELY UPON COMPLETION
OF SEED APPLICATION,. IN ACCORDANCE W/ VESCH STD 3.35.
PS PERMANENT SEEDING SCHEDULE
NO SCALE
(STD. & SPEC. 3.32 OF VIRGINIA EROSION &
SEDIMENT CONTROL HANDBOOK, 3RD ED.)
STONE 70' MIN.
CONSTRUCTION
ACCESS 3"" SM-2A ASPHALT
2% 29
TOP COURSE EXISTING
PAVEMENT
° 6" MIN. 21A AGGREGATE BASE
PROFILE
STONE 70' MIN.
CONSTRUCTION ASPHALT PAVED
ACCESS [-0 WASHRACK
EXISTING
y9I% PAVEMENT
129, 72' MIN.
)m I �
*MUST EXTEND FULL WIDTH L- An TO SEDIMENT ~POSITIVE DRAINAGE
OF INGRESS AND EGRESS TRAPPING DEVICE
OPERA TION
PLAN
12' MIN. POSITIVE DRAINAGE
TO SEDIMENT
27
TRAPPING DEVICE
FILTER CLOTH) .._...
SECTION A -A
A minimum water top of 1 inch must be installed with a minimum 1 inch ballcock
shutoff valve supplying a wash hose with diameter or 1.5 inches for adequate
constant pressure. Wash water must be carried away from the entrance to on
approved settling area to remove sediment. All sediment shall be prevented from
entering storm drains, ditches or watercourses.
PAVED WASH RACK
DESCRIPTION OF EROSION & SEDIMENT
CONTROL MEASURES:
EROSION AND SEDIMENT CONTROL MEASURES:
IT IS ANTICIPATED TO USE CONSTRUCTION ENTRANCES, DIVERSION DIKES, EXISTING SEDIMENT
BASINS, AND SILT FENCES WILL BE INSTALLED TO CON7ROL SURFACE DRAINAGE. TEMPORARY
SEEDING WILL BE USED IMMEDIATELY FOLLOWING ALL LAND DISTURBANCE AC77077ES.
TEMPORARY STOCKPILE AREAS WILL BE MAINTAINED FROM TOPSOIL THAT WILL BE STRIPPED
FROM AREAS TO BE GRADED AND STORED FOR LATER SPREADING. STOCKPILE LOCA77ONS SHALL
BE ON SITE AND SHALL BE STABILIZED WITH A TEMPORARY VEGETATIVE COVER. PERMANENT
SEEDING WILL BE PERFORMED FOR ALL AREAS WHICH WILL NO LONGER BE EXCAVATED AND
WHERE CONSTRUCT70N ACT70TES HAVE CEASED. PERMANENT SEEDING SHALL ALSO BE
PERFORMED FOR ALL DENUDED AREAS WHICH WILL BE LEFT DORMANT FOR A YEAR OR MORE.
SELECTON OF SEED MIXTURE WILL DEPEND ON THE TIME OF YEAR APPLIED.
TEMPORARY SEEDING WILL BE PERFORMED FOR ALL DENUDED AREAS WHICH WILL BE LEFT
DORMANT FOR MORE THAN SEVEN DAYS. THESE AREAS SHALL BE SEEDED WITH FAST
GERMINA7NG VEGETA7ON IMMEDIATELY FOLLOWING GRADING OF THOSE AREAS. SELECT70N OF
SEED MIXTURE WILL DEPEND ON 7HE 77ME OF YEAR APPLIED.
CONSTRUCTION ENTRANCE.-
A STABILIZED PAVED CONSTRUCTION ENTRANCE WITH A WASH RACK LOCATED AT POINTS OF
VEHICULAR INGRESS AND EGRESS ON A CONSTRUCTION SITE TO REDUCE THE AMOUNT OF MUD
TRANSPORTED ONTO PAVED PUBLIC ROADS BY MOTOR VEHICLES OR RUNOFF.
CONSTRUCT70N ENTRANCES SHALL BE INSTALLED AS SHOWN ON THE PLANS TO REDUCE 77-IE
AMOUNT SEDIMENT TRANSPORTED ONTO PUBLIC ROADWAYS.
SILT FENCE,
A TEMPORARY SEDIMENT BARRIER CONSISTING OF A SMTHE7C FILTER FABRIC STRETCHED
ACROSS AND ATTACHED TO SUPPORTING POSTS AND ENTRENCHED. TO INTERCEPT AND DETAIN
SMALL AMOUNTS OF SEDIMENT FROM DISTURBED AREAS DURING CONSTRUCTON OPERA7ONS IN
ORDER TO PREVENT SEDIMENT FROM LEAVING THE SITE. TO DECREASE 7HE VELOCITY OF SHEET
FLOWS AND LOW -TO -MODERATE LEVEL CHANNEL FLOWS. THE SILT FENCE BARRIERS SHALL BE
INSTALLED DOWN SLOPE OF AREAS WITH MINIMAL GRADES TO FILTER SEDIMENT LADEN RUNOFF
FROM SHEET FLOW AS INDICATED. THEY SHALL BE INSPECTED IMMEDIATELY AFTER EACH
RAINFALL AND MAINTAINED IN ACCORDANCE WITH THE VIRGINIA EROSION & SEDIMENT CONTROL
HANDBOOK (VESCH).
PERMANENT STABILIZA TON.
THE ESTABLISHMENT OF PERENNIAL VEGETATIVE COVER ON DISTURBED AREAS BY PLANTING
SEED. TO REDUCE EROSION AND DECREASE SEDIMENT YIELD FROM DISTURBED AREAS. TO
PERMANENTLY STABILIZE DISTURBED AREAS IN A MANNER THAT IS ECONOMICAL, ADAPTABLE TO
SI7E CONDITIONS, AND ALLOWS SELECTION OF THE MOST APPROPRIATE PLANT MATERIALS TO
IMPROVE WILDLIFE HABITAT. TO ENHANCE NATURAL BEAUTY. UPON COMPLETION OF
CONS7RUCT70N ACT1077ES, ALL AREAS WILL RECEIVE A PERMANENT VEGETATIVE COVER.
TEMPORARY SEEDING. -
THE ESTABLISHMENT OF A TEMPORARY VEGETATIVE COVER ON DISTURBED AREAS BY SEEDING
WITH APPROPRIATE RAPIDLY GROWING ANNUAL PLANTS. TO REDUCE EROSION AND
SEDIMENTATION BY STABILIZING DISTURBED AREAS THAT WILL NOT BE BROUGHT TO FINAL GRADE
FOR A PERIOD OF MORE THAN 30 DAYS. TO REDUCE DAMAGE FROM SEDIMENT AND RUNOFF TO
DOWNSTREAM OR OFF -SITE AREAS, AND TO PROVIDE PROTECTION TO BARE SOILS EXPOSED
DURING CONSTRUCTION UNTIL PERMANENT VEGETATION OR OTHER EROSION CONTROL MEASURES
CAN BE ESTABLISHED.
DUST CONTROL:
REDUCING SURFACE AND AIR MOVEMENT OF DUST DURING LAND DISTURBING, DEMOLITION AND
CONSTRUCT70N ACTIVI7ES.
TO PREVENT SURFACE AND AIR MOVEMENT OF DUST FROM EXPOSED SOIL SURFACES AND
REDUCE 774E PRESENCE OF AIRBORNE SUBSTANCES WHICH MAY PRESENT HEALTH HAZARDS,
TRAFFIC SAFETY PROBLEMS OR HARM ANIMAL OR PLANT LIFE.
DUST CONTROL MEASURES SHALL BE EMPLOYED TO PREVENT SURFACE AND AIR MOVEMENT OF
DUST DURING CONSTRUCTION. MEASURES EMPLOYED SHALL BE IN ACCORDANCE Wl7H THE VESCH.
TEMPORARY DIVERSION DIKE:
A RIDGE OF COMPACTED SOIL CONSTRUCTED AT THE TOP OR BASE OF A SLOPING DISTURBED
AREA WHICH DIVERTS OFF -SITE RUNOFF AWAY FROM UNPROTECTED SLOPES AND TO A
STABILIZED OUTLET OR TO DIVERT SEDIMENT -LADEN RUNOFF TO A SEDIMENT 7RAPPING
STRUCTURE. MAXIMUM EFFEC7VE LIVE IS 18 MONTHS.
ROCK CHECK DAMS:
SMALL, TEMPORARY STONE DAMS CONSTRUCTED ACROSS A DRAINAGE DITCH TO REDUCE THE
VELOCITY OF CONCENTRATED FLOWS, REDUCING EROSION OF THE SWALE OR DITCH. LIMITED TO
USE /N SMALL OPEN CHANNELS WHICH DRAIN 10 ACRES OR LESS; SHOULD NOT BE USED IN
LIVE STREAMS.
STORM DRAIN INLET PROTECTION:
THE INSTALLATION OF VARIOUS KINDS OF SEDIMENT TRAPPING MEASURES AROUND DROP INLETS
OR CURB INLET STRUCTURES PRIOR TO PERMANENT STABILIZATION OF THE DISTURBED AREA;
LIMITED TO DRAINAGE AREAS NOT EXCEEDING ONE ACRE, AND NOT INTENDED TO CONTROL
LARGE, CONCENTRATED STORMWATER FLOWS
TEMPORARY SEDIMENT TRAP:
A SMALL PONDING AREA, FORMED BY CONSTRUCTING AN EARTHEN EMBANKMENT W RI A STONE
OU7LET ACROSS A DRAINAGE SWALE, TO DETAIN SEDIMENT -LADEN RUNOFF FROM SMALL
DISTURBED AREAS FOR ENOUGH TIME TO ALLOW MOST TO THE SUSPENDED SOLIDS TO SETTLE
OUT. MAXIMUM EFFECTIVE LIFE IS 18 MONTHS.
TEMPORARY SEDIMENT BASIN:
A TEMPORARY BARRIER OR DAM WITH CONTROLLED STORMW47ER RELEASE STRUCTURES WHICH IS
FORMED BY CONSTRUCTING AN EMBANKMENT OF COMPACTED SOIL ACROSS A DRAINAGEWAY. IT
IS USED TO DETAIN SEDIMENT -LADEN RUNOFF FROM DRAINAGE AREAS 3 ACRES OR GREATER
FOR ENOUGH TIME TO ALLOW MOST OF 774E SUSPENDED SOLIDS TO SETTLE OUT IT CAN BE
CONSTRUCTED ONLY WHERE THERE 7S SUFFICIENT SPACE AND APPROPRIATE TOPOGRAPHY
MAXIMUM EFFECTIVE LIFE IS 18 MONTHS UNLESS DESIGNED AS A PERMANENT POND BY A
QUALIFIED PROFESSIONAL.
OUTLET PROTECTION:
THE INSTALLATION OF RIPRAP CHANNEL SECTIONS AND/OR STILLING BASINS BELOW STORM
DRAIN OUTLETS TO REDUCE EROSION AND UNDER-CUTTNG FROM SCOURING AT OUTLETS AND TO
REDUCE FLOW VELOCITIES BEFORE STORMWATER ENTERS RECEIVING CHANNELS BELOW THESE
OUTLETS.
CULVERT INLET PROTECTION:
A SEDIMENT FILTER LOCATED AT THE INLET TO STORM SEWER CULVERTS WHICH PREVENTS
SEDIMENT FROM ENTERING, ACCUMULATING IN AND BEING TRANSFERRED BY THE CULVERT. IT
ALSO PROVIDES EROSION CON7ROL AT CULVERTS DURING 774E PHASE OF A PROJECT WHERE
ELEVATIONS AND DRAINAGE PATTERNS ARE CHANGING CAUSING ORIGINAL CONTROL MEASURES
TO BE INEFFECTIVE.
SAFETY FENCE.•
A PR07EC77VE BARRIER INSTALLED TO PROHIBIT UNDESIRABLE USE OF AN EROSION CONTROL
MEASURE.
PERMANENT STABILIZATION:
PERMANENT SEEDING WILL BE APPLIED TO ALL DISTURBED AREAS AS PER THE PERMANENT
STABILIZATION OF THIS EROSION & SEDIMENT CONTROL NARRATME.
AFTER CONSTRUCTION IS COMPLETED, ALL DISTURBED AREAS OF THE SITE WILL BE LIMED,
FERTILIZED, AND SEEDED AS PER CURRENT VDOT STANDARDS. THIS SHALL CONSIST OF
THE FOLLOWING. -
TOP SOIL - 2" DEPTH
LIME - 2 TONS/ACRE
FERTILIZER - 600 LBS/ACRE OF 15-30-15
SEED - ERNST 5311 CONSERVATION SEED MIX - ERNMX-114 (45 LBS/ACRE PENNLAWN
CREEPING RED FESCUE J7.5 LBS ACRE ARGILE KENTUCKY BLUEGRASS J7.5 LBS ACRE
PARK KENTUCKY BLUEGRASS, 15 LBS/ACRE ANNUAL RYEGRASS & 15 LBS/ACRE PLEASURE
PERENNIAL AFTER THESE AREAS ARE STABILIZED THEY WILL BE MOWED AND MAINTAINED
ON A REGULAR BASIS.
MAINTENANCE.
IN GENERAL, ALL EROSION AND SEDIMENT CONTROL MEASURES WILL BE CHECKED DAILY
AND AFTER EACH SIGNIFICANT RAINFALL. SPECIFIC ATTENTION WILL BE GIVEN TO THE
FOLLOWING ITEMS. -
A. SEDIMENT BASINS AND/OR TRAPS WILL BE CLEANED AND MAINTAINED IN
ACCORDANCE WITH THE VIRGINIA EROSION & SEDIMENT CONTROL HANDBOOK.
B. ALL GRAVEL OUTLETS WILL BE CHECKED REGULARLY FOR SEDIMENT BUILDUP THAT
WILL PREVENT PROPER DRAINAGE. IF THE GRAVEL IS CLOGGED BY SEDIMENT THE
GRAVEL WILL BE REMOVED AND CLEANED, OR IT WILL BE REPLACED.
C. ALL SILT FENCE BARRIERS WILL BE CHECKED REGULARLY FOR UNDERMINING OR
DETERIORATION OF THE FABRIC AND REPAIRED AS REQUIRED. SEDIMENT SHALL BE
REMOVED WHEN THE LEVEL OF SEDIMENT DEPOSIT70N REACHED HALF WAY TO THE
TOP OF THE BARRIER.
D. ALL SEEDED AREAS WILL BE CHECKED REGULARLY TO SEE THAT A GOOD STAND IS
MAINTAINED. AREAS SHOULD BE FERTILIZED AND RESEEDED AS NEEDED.
EROSION CONTROL NOTES & NARRATIVE
PURPOSE
THE PURPOSE OF THIS LAND DISTURBING ACTIVITY IS TO EXPAND THE EXISTING
PARKING LOT FOR THE MARTHA JEFFERSON HOSPITAL CANCER TREATMENT WING. THE
TOTAL AREA TO BE DISTURBED WITH THIS PLAN IS 1.25 ACRES.
EXISTING SITE CONDITIONS. -
THIS SITE IS CURRENTLY A PARKING LOT AND OPEN SPACE ON THE MARTHA JEFFERSON
HOSPITAL CAMPUS
ADJACENT AREAS. -
THIS SITE IS BORDERED TO THE NORTH AND EAST BY MARTHA JEFFERSON DRIVE. 7HE
EXISTING MARTHA JEFFERSON HOSPITAL IS TO THE WEST AND A PARKING LOT TO THE
SOUTH.
OFFSITE LAND DISTURBANCE
NO CONSTRUCTION ACTIVITIES ARE PROPOSED OUTSIDE OF THE LIMITS OF DISTURBANCE.
CRITICAL AREAS. -
THERE ARE NO CRITICAL SLOPES WITHIN THE PROJECT BOUNDARY.
SOILS. -
SOILS MAP IS INCORPORATED INTO THE EROSION CONTROL PLANS WITH SOILS DATA
INCLUDED W/TH THIS NARRATIVE.
SEQUENCE OF CONSTRUCTION.-
1. NOTIFY ALBEMARLE COUNTY TO SCHEDULE A PRE -CONSTRUCTION MEETING AS
REQUIRED.
2. NO EROSION CONTROL MEASURES MAY BE REMOVED DURING THE CONSTRUCTION
PROCESS WITHOUT THE APPROVAL FROM THE INSPECTOR ON THE PROJECT.
4. INSTALL 174E INITIAL PERIMETER MEASURES AS SHOWN ON THE PHASE I EROSION
CONTROL SHEET. 7HIS INCLUDES SILT FENCE & TREE PROTECTION. THE EXISTING
ENTRANCE WILL SERVE AS THE CONSTRUC7ON ENTRANCE FOR 774E PROJECT UNTIL
THE PERIMETER E&S MEASURES HAVE BEEN INSTALLED. MEASURES INTENDED TO
TRAP SEDIMENT SHALL BE CONSTRUCTED AS A FIRST STEP WITH ANY LAND
DISTURBANCE ACTIVITY AND SHALL BE MADE FUNCT70NAL BEFORE UPSLOPE LAND
DISTURBANCE TAKES PLACE
5. INSTALL THE PROPOSED PAVED CONSTRUCT70N ENTRANCE WITH WASH AREA AS
SHOWN ON THE PLANS. CONSTRUCT70N ENTRANCES TO BE INSTALLED WHERE
CONSTRUCTION VEHICLE ROUTES INTERSECT PAVED 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 PUBLIC ROAD
SURFACE, THE ROAD SHALL BE CLEANED THOROUGHLY AT THE END OF EACH DAY.
SEDIMENT SHALL BE REMOVED FROM THE ROADS BY SHOVELING OR SWEEPING AND
TRANSPORTING TO A SEDIMENT CONTROL DISPOSAL AREA. S7REET WASHING SHALL
BE ALLOWED ONLY AFTER SEDIMENT IS REMOVED IN THIS MANNER. AFTER THE
CONSTRUC7ON ENTRANCE AND INITIAL PERIMETER MEASURES HAVE BEEN INSTALLED,
THE CONTRACTOR MAY INSTALL THE SEDIMENT TRAP AND DIVERSION BERM.
6. ONCE ALL THE EROSION CONTROL ITEMS HAVE BEEN INSTALLED AS SHOWN ON THE
PHASE I EROSION CONTROL PLAN AND THE INSPECTOR HAS APPROVED THE EROSION
CONTROL MEASURES, THE CONTRACTOR CAN BEGIN GRADING THE SITE AS SHOWN ON
THE PHASE ll E&S PLAN. STABILIZATION MEASURES SHALL BE APPLIED TO EARTHEN
STRUCTURES SUCH AS DAMS, DIKES, AND DIVERSIONS IMMEDIATELY AFTER
INSTALLATION.
7. 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
(UNDISTURBED) FOR LONGER THAN 30 DAYS. PERMANENT STABILIZATION SHALL BE
APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR MORE THAN ONE YEAR.
8. ONCE THE SI7E IS ROUGH GRADED, THE CONTRACTOR SHALL BEGIN INSTALLATION OF THE
UTILITIES, CURB AND GUTTER, AND PAVEMENT. INLET PROTECT70N SHALL BE INSPECTED
AFTER EACH RAINFALL EVENT AND REPAIRS SHALL BE MADE AS NEEDED. IF THE STONE
FILTER BECOMES CLOGGED WITH SEDIMENT SO THAT IT NO LONGER ADEQUATELY PERFORMS
ITS FUNCTION, THE STONE MUST BE PULLED AWAY AND CLEANED AND/OR REPLACED
9. NO ITEM SHALL BE REMOVED UNLESS THE UPSTREAM AREAS ARE STABILIZED AND
THE INSPECTOR GIVES PERMISSION. THE PROPOSED SEDIMENT TRAP SHALL BE
CONVERTED TO DRY DETENTION FACILITY AFTER THE CONSTRUCTION OF THE PARKING
LOT HAS BEEN COMPLETED. THIS INCLUDES THE INSTALLATION OF YD 1, THE SWM
FACILITY RISER STRUCTURE.
10. MAINTAIN ALL EROSION CONTROL MEASURES AS SPECIFIED IN THE VIRGINIA EROSION
AND SEDIMENT CONTROL HANDBOOK, REMOVING ONLY WHEN APPROVED BY THE LOCAL
PROGRAM ADMINISTRATOR IN ACCORDANCE WITH THE VIRGINIA EROSION AND
SEDIMENT CONTROL HANDBOOK.
11. ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES SHALL BE REMOVED
WITHIN 30 DAYS AFTER FINAL SITE STABILIZAT70N OR AFTER THE TEMPORARY
MEASURES ARE NO LONGER NEEDED UNLESS OTHERWISE AUTHORIZED BY THE LOCAL
PROGRAM ADMINISTRATOR. TRAPPED SEDIMENT AND THE DISTURBED SOIL AREAS
RESULTING FROM THE DISPOSITION OF TEMPORARY MEASURES SHALL BE
PERMANENTLY STABILIZED TO PREVENT FURTHER EROSION AND SEDIMENTATION.
TEMPORARY SEEDING.
ALL DENUDED AREAS WHICH WILL BE LEFT DORMANT FOR EXTENDED PERIODS OF 77ME SHALL
BE SEEDED WITH FAST GERMINATING TEMPORARY VEGETATION IMMEDIATELY FOLLOWING
GRADING. SELECTION OF THE SEED MIXTURE WILL DEPEND ON THE 77ME OF YEAR AND WILL
BE APPLIED TO DISTURBED ARES THAT WILL NOT BE BROUGHT TO FINAL GRADE WITHIN 30
DAYS.
PLANTS SHOULD BE SELECTED APPROPRIATE TO THE SEASON AND SITE CONDITIONS FROM
TABLES 3.31B AND 3.31C. NOTE THAT TABLE 3.31E PRESENTS PLANTS WHICH CAN BE USED
W17HOUT EXTENSIVE EVALUATION OF SI7E CONDITIONS; TABLE 3.31C PRESENTS MORE
W-DEPTH INFORMATION ON THE PLANT MATERIALS.
TO CONTROL EROSION ON BARE SOIL SURFACES, PLANTS MUST BE ABLE TO GERMINATE AND
GROW. SEEDBED PREPARATION IS ESSENTIAL.
AN EVALUATION SHOULD BE CONDUCTED TO DETERMINE IF LIME IS NECESSARY FOR
TEMPORARY SEEDING. TABLE 331A MAY BE USED TO DETERMINE THE ACTUAL NEED ALONG
W17H SUGGESTED APPLICATION RATES -
FERTILIZER SHALL BE APPLIED AS 600 LBS/ACRE OF 10-20-10 (14 LBS/1,000 SQ. FT) OR
EQUIVALENT NUTRIENTS. LIME AND FER7LIZER SHALL BE INCORPORATED INTO THE TOP 2 TO
4 INCHES OF THE SOIL IF POSSIBLE.
IF THE AREA HAS BEEN RECENTLY LOOSENED OR DISTURBED, NO FURTHER ROUGHENING IS
REQUIRED. WHEN THE AREA IS COMPACTED, CRUSTED, OR HARDENED, THE SOIL SHALL BE
LOOSENED BY DISCING, RAKING, HARROWING, OR OTHER ACCEPTABLE MEANS. TRACKING WITH
BULLDOZER CLEATS IS MOST EFFECTIVE ON SANDY SOILS. THIS PRACTICE OFTEN CAUSES
UNDUE COMPACTON OF THE SOIL SURFACE ESPECIALLY IN CLAYEY SOILS AND DOES NOT
AID PLANT GROWTH AS EFFECTIVELY AS OTHER METHODS OF SURFACE ROUGHENING.
SEED SHALL BE EVENLY APPLIED WITH A BROADCAST SEEDER, DRILL, CUL77PACKER SEEDER
OR HYDROSEEDER. SMALL GRAINS SHALL BE PLANTED NO MORE THAN 1JINCHES DEEP.
SMALL SEEDS, SUCH AS KENTUCKY BLUEGRASS, SHOULD BE PLANTED NO MORE THAN 4
INCH DEEP. 07HER GRASSES AND LEGUMES SHOULD BE PLANTED FROM 4 INCH TO 11 DEEP.
SEEDINGS MADE IN FALL FOR WINTER COVER AND DURING HOT AND DRY SUMMER MONTHS
SHALL BE MULCHED ACCORDING TO MULCHING, STD. & SPEC. 3.35, EXCEPT THAT
HYDROMULCHES (FIBER MULCH) WILL NOT BE CONSIDERED ADEQUATE. STRAW MULCH SHOULD
BE USED DURING THESE PERIODS.
AREAS WHICH FAIL TO ESTABLISH VEGETATIVE COVER ADEQUATE TO PREVENT RILL EROSION
WILL BE RE -SEEDED AS SOON AS SUCH AREAS ARE IDENTIFIED.
STORMWATER RUN-OFF CONSIDERATIONS:
STORMWATER MANAGEMENT. THE STORMWATER RUNOFF FROM
THIS PROJECT DRAINS TEMPORARILY TO THE PROPOSED SEDIMENT
TRAP. THE SEDIMENT TRAP WILL BE CONVERTED TO A s.
PERMANENT STORMWATER MANAGEMENT FACILITY AFTER THE y9r
CONSTRUCTION OF THE PROPOSED PARKING LOT EXPANSION.
ATTACH FILTER
TO STAKES OR
EXTEND IT INTO
Compacted Soil
����
le Liner
t6" min. I �al7III III I-I--111L11`
-� - �IIIIIII= EXCAV.
BACKF
4.5' min. COMPA
SOURCE: VA. DSWC PLATE 3,09-1
DD TEMPORARY DIVERSION DIKE
.05-
SILT FENCE
sF (WITHOUT WIRE SUPPORT)
NO SCALE
PAV
SCOTT/R. CRTLI
No. 35791
09/08/20
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JOB NO.
192162
SCALE
AS NOTED
Sm V. DSWC
NO SCALE
3
Sediment Trap Design
drainage area (acres)(<3) 1.08
trap volumes:
elevation (ft) area (sf) volume(cf) volume(cy)
517 1455.0 0 0.0
513 2334.0 1,877 69.5
% 519 3323.0 4,691 173.8
520 4369.0 8,525 315.8
\ /
PROPOSED YD-i TO SERVE ASTHE—
wet storage:
OUTFALL FOR THE SEDIMENT
I
TRAP wet storage required (cy) (67*DA) 72.4
oottom of stone weir (ft) 518.66
50 _ ,vet storage provided at this elevation (cy) 138.3
\ \ \ \ 5 ` \' \ ' / \ / / \� / - SF x $ slope of wet storage sides 3:1
_
�-
dry storage:
YD-i, 24" YARD DRAIN dry storage required (cy) (67*DA) 72.4
WITH DOME GRATE PROPOSED LIMITS OF crest of stone IT 519.30
I 1
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TEMPORARY
DIVERSIONS
COARSE:.:
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COMPACTED SOIL
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llllll 1911IIIU1111"�1h1111111111��
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ursuJI
TYPICAL EARTHEN STRUCTURE
Source: Va. r
TS X 519 RIM=5i8.66, INV=5i6.5o DISTURBANCE=i.25 ac. dry storage provided at this elevation (cy) 78.0
slope of dry storage sides 3:1
.TIE-IN TO EXISTING DI I I x DRAINAGE DIVIDE (TYP.)
INV. IN=515.90
/ 7� EXISTING DI-2A (STR-21A) PROJECT BOUNDARY
EX. RIM=52i.00 IP \ ROJ CT OU NDA R
EX. INV. OUT=515.8o (12" RCP) \
I 7 �
O
CREST EST OF STONE WEIR yw„,� �
E11 � SCOTT R. LLINSZ
L� No. 35791
DRY STORAGE 09/08/20 w4
WET STORAGE V--
Lb%
(E!(CAVAIW)
FI.TER CLDTN DRIGIINL
\ GNWxD
ELLV
SEE PLATE 113-1 COMSE AGGREGATE Cuss I RPRAP
weir length (ft) (6xDA) N/A
bottom of trap elevation (ft) 517
bottom trap dimensions: 18'x130'
top of dam elevation (ft) 520
top width of dam (ft) 10
top trap dimensions 36'x167' z z
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// % ° A QLOCATION OF
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/vy WASHOUTAREA I / G°
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LOCATION OF DUMPSTER
Tf f
,` LOCATION OF
P ��
PORTA-POTTIES � o —' EXISTING UTILITY EASEMENT
S � ,
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PHASE I DRAINAGE
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+ = OF SOIL TYPE 72C3 �� I \'
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TP NOTE: EXISTING PARKING AREATO SERVE TS \" < d
AS THE INITIAL PHASE I CONSTRUCTION% I d
/I/ ENTRANCE UNTIL THE PERIMETER E&S 00
CONTROLS HAVE BEEN INSTALLED AND N N \
X SF THE PROPOSED CONSTRUCTION
x
ENTRANCE HAS BEEN CUT IN.
DC
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Pv
/ TMP 07800-00-00-020M4 / V�
MARTHA JEFFERSON HOSPITAL �I \
C/O SENTARA HEALTHCARE ��� � J25
I/ D.B. 4935, PG. 500
/ GRAPHIC SCALE W-----_-
w
II ( IN FEET)
1 inch = 20 ft.525
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WINE SCREEN CONCRETE MOCK
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SPECIFIC APPLICATION
=�11�I�111111��(fll � �
THIS METHOD • PROTECTION WHERE
HEAVY FLOWSEXPECTED AND WHERE AN OVERFLOW
AROUNDCAPACITY IS NECESSARY TO PREVENT EXCESSIVE PONDING
THE
GRAVEL1, OR #5 COARSE
Source: Va. DSWC Plate 3.07-3
M-38
GRAVEL .. INLET
SEDIMENT
FILTER
GRAVEL FRjER
RUNOFF WATER
r
WIRE NIESIA
FILTERED WATER
lulu 1�I-=' � �i-!� Illllll � IIII!
SEDIM
C C GUTTER CURB Iwo
SPECIFIC APPLICATION
THIS
�=
METHOD OF INLET PROTECTIONA APPLICABLE AT CURB INLETS
WHEREIO 1ING IN FRONT OF THE STRUCTURE IS NOT.1 I CAUSE
INCONVENIENCE1' DAMAGE TO ADJACENT STRUCTURES AND UNPROTECTED
GRAVEL
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JOB NO.
192162
SCALE
1 I'=20r
SHEET NO.
4
1�TH
4
°a
SCOTT R. LLINS'Z
No. 35791
— PIP A \ SD �� 09/08/20
/ / PROPOSED YD-1 TO SERVE AS THE
OUTFALL FOR THE SEDIMENT TRAP °`
( ° s J \ \\ \ \ \
\ \ \
SF \ \
YD-i 24" YARD DRAIN \ \
� / X C WITH DOME GRATE � PROPOSED LIMITS OF \
5�9 RIM=5i8.66, INV=5i6.5o DISTURBANCE=i.25 ac.
+
DRAINAGE DIVIDE (TYP.)
— - -
�i k z O O
0�\ems — N � �A
.TIE -INTO EXISTING DI
s
\ \ \ \ INV. IN=515.90 o a
SF / � o 0
- k \\ Q
ip Ln w
EXISTING DI-2A(STIR A) \� m w w
\ >; PROJECT BOUNDARY 4 \ \ ,A o < <
EX. RIM-5zi.00 IP \\, / VJ z a -� < <
EX. INV. OUT=515.8o (12" RCP) + \ \ H O ~ ¢ w w
of
u W w
a a
/ \
I � .
ON
\ 0 FUELING TANK E
Ps
4
^a � LOCATION OF DUMPSTER
PHASE II DRAINAG 4
I '
S 1 7 S LOCATION OF AREA TO SEDIMENT - --_ I
,\ EXISTING UTILITY EASEMENT
1
11 / + 4 PORTA-POTTIES ;' 14' TRAP - i.o8 ACRES
j _ I $ � CONTRACTOR PARKING IP \ IP ° rn ° /� � ` .• —
AND STAGING AREA �'_ o
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- 4 Q
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TMP o7800-00-00-020M4 V� ILL.
MARTHAJEFFERSON HOSPITAL / rQ•^1 ILL.
/ C/O SENTARA HEALTHCARE I F 25 oLu
`� /
D.B. 4935, PG. 500 CNI Q
GRAPHIC SCALE v� W - w ` / / ��� w w
M� w ��
roe No.
IN FEET) / I I I / S ' _ — \ 192162
SCALE
°° / 1 inch = 20 ft. // / \ / / \ 1It
525
SHEET NO.
_ WM PLAN:
PRE -DEVELOPMENTS
O SCALE I" 30'
+
Z ISTING -STORM SEWER 9 ��
PROPOSED LI MI O.FDISTURi;ANCE
(1.25 ac.)8QUNDARY IS USED TO DEFINE (TO REFiYAIN�-SURROUNDING
"
_ ) / THE SITE & DIRECTING ITS
EXISTING STORM SEWER THE LIMITS OF THEV�RRMWATER - RUNOFF TO AN EXISTING I
(TO REMAIN) SURROUNDING QUALITYCALCULATIOBOUNDARY _
/SWM FACILITY,. TYP.
THE SITE &DIRECTING ITS
/o
RUNOFF TO AN EXISTING h -
- - 'SWM FACILITY, TYP. THIS AREA CURRENTLY DRAINS TO AN EXISTING SWM
/ `�1 / _
O■W■ _ _ FACILITY, WHEREIT RECEIVES STORMWATER QUANTITY
�-.■ g � TREATMENT. IN THE POST-DEVELOPMENTSTATE IT
RECEIVES TNEW/ADDITIONAL REATMENT VIATHE P OPOSED FACILITY PRIOR TO
v
CONTINUING TOTHE -EXISTING SWM FACILITY.
•� PROJECT LIMITS, TYP.
i � I �� � -� � � � �� ♦ �95�OF OLF
SUBAREA B
63 ac
_ --
-- SUBAREA
0.70 ac.-
�, Tc 0.10 hrs,:%
-. H= W� 3 cat I�LF \ L �^.I� // / I/ • ".
2451 F�-CHANNEL�
\/\�
j�52a ��
INMin
r 1, ♦ /E �!►
111 it IS11
/ to to 1/i■■1�"1 -- 1/11111�� � / �� N �
523
E-y_ u� ---- _ s - / 525
Xts�..
' TING STORM SEWER 24 �T
/ (TO REMAIN) SURROUNDING
THE SITE & DIRECTING ITS / 520
RUNOFF TO AN EXISTING
Existing Impervious Area Summary SWM FACILITY, TYP. /5z�
DA A- Water Quantity _ _ `, I 521
Ul
Existing Sidewalk & Walkways 2,600 sf _ )
Existing Parking Lot & Roadway 21,525 sf
24,125 sf -��
DB A - Water Quantity 2s / -_ w
Existing Sidewalk & Walkways W W
Water Quality Defined by Limits of Disturbance
Existing Sidewalk & Walkways 2,175 sf
Existing Parking Lot &Roadway 13,475 sf
15,650 sf
2
too -YEAR ANALYSIS:
IN ACCORDANCE WITH VA DEQ's 2o22 DESIGN SPECIFICATIONS, THE
DESIGN REQUIREMENTS SET FORTH IN APPENDIX A's EARTHEN
EMBANKMENTS "...MAY NOT APPLY TO SMALL EMBANKMENTS OR
PROPOSED 1o'WIDE GRADED SAFETY ROPOSED YD-1(024" HDPE STANDPIPE w/TRASH TO STORM DRAINAGE OUTFALL STRUCTURES WITH LESS THAN
BENCH WITH A 2%MAXIMUM CROSS RACK) SHALL SERVE AS THE RISER STRUCTURE. SEE FEET OF EMBANKMENT HEIGHT." THE PROPOSED PLAN, WHICH
SLOPE. SAFETY BENCH TO BE LOCATED TRASH RACK DETAIL ON THIS SHEET. RISER HAS AN EMBANKMENT OF 22"±, IS AN EXAMPLE OF SUCH A
AT THE TOP OF THE FACILITY. STRUCTURE SHALL HAVE A RIM E1_EV.=518.66' WITH CONFIGURATION AND THEREFORE i' OF FREEBOARD IS NOT
525 ONE (1)03" LOW FLOW ORIFICE(INV=5i6.5o'). 525 REQUIRED DURING THE ioo-YEAR DESIGN STORM,
CONTRACTOR SHALL C
PROPOSED DETENTION
OUTFALL INTO EXISTING
PROPOSED 33.10OF 012HD
A STONE BED FOUNDATION
MINIMUM PIPE MANUFA
REQUIREMENTS. (S=1.81
IN=516.5o; INV OUT=515.
CONTRACTOR SHALLI
EMBANKMENTIN ACCOR
w THE DESIGNS SHO
THESE
ONNECT GRATIN
BASIN's GRADE
STIR. n A
520 _ �: yr aEA��15 9. 520
10-yr P'1EAK WS -518.9 Q
PE WITH vf.. 2-yr PEAK WSEi=518.58 g
1-yr PEAK WSE-518.20 ^
MEETING _ _F-
CTURER P OPOSED
%, INVGRADE
9o') 515 515
PROPOSED BASIN's FLOOR SHALL
N STALL BE SLOPED TO DRAIN TO THE
DANCE TO PREVENT FLOTATION THE RISER RISER(o.5o% MIN.). CONTRACTOR
WN ON ASESHACL BE
- BEDDED6" SHALL INSTALL A GENTLY SLOPED
-
PLANS. INTO AN I8"THICK REINFORCED CHANNEL AT THE BASIN's LOW
CONCRETE FOUNDATION THAT IS POINT TO ENSURE POSITIVE
510 'x AND BURIED BELOW GROUND. DRAINAGETHROUGHOUT.
LO
W N 7 N O . O .
O O n N r r7
rN N
'U) to 0 LOOW
PROPOSED 35' WIDE GRASS LINED
EMERGENCY SPILLWAY W/ 4:2 SIDE
SLOPES & CREST ELEV.=529.66'
525 525
io' WIDE
DAM EL
TY
WATERSHED SUMMARY
Pre -Development
POST -DEVELOPMENT SWM PLAN:
/ / I -EXISTING-STORM SEWER \
PROPOSED LIMITS OF DISTURBANCE (TO REMAIN) SURROUNDING
- (1.25ac)BOUNDARY ISUSED TODEFINE THE SITE & DIRECTING ITS / \
/ THE LIMITS OF THE VRRM WATER RUNOFF TO AN EXISTING
EXISTING STORM SEWER//-' �' QUALITY CALCULATIONS BOUNDARY - - --- SWM FACILITY, TYP. /
(TO REMAIN) SURRpUNDING �- -
THE SITE & DIRE Q NG ITS
RUNOFF TO AN EXISTING
9 h
SCALE 1"=30'
,\J�l
WM FACILITY, TYP:Sig j
/ 5
i
X. S,TR.
7
PROJECT LIMITS. TYP.
� y
�, '� ♦♦♦ j \X l
0.26 ac. i(� �\ /
,. CN=.93 / \\ \ \ / I PROPOSED SWM
Tc=0.10 hrs. FACILITY EASEMENT `
,,, -- - - DEDICATEDTOTHE
w t Wiz' - ♦ COUNTY FOR PUBLIC
- a -STR. r� u' USE
SUBAREA B-
_ _ ■ I --
.- 1.07 dC..
CN=87 `\ 1 � /G MISTING UTILITY
TC=0.10 hrs EASEMENT D. B. 4077
PG_ 1 18
3 3-B
r ♦ >` w irk,,
'♦
J
/Ao sa�411
_ l �528 ��
■ illiliI
m .
I
1 \�
•iti
..e ' N
1n W
52,3
i 5�t
5 \
' I R Vi S"1 \ F7 1
EXISTING STORM SEWER `4 � � •
(TO REMAIN) SURROUNDING - / I / \ \ 520 \.
THE SITE & DIRECTING ITS
RUNOFF TO AN EXISTING
Proposed Impervious Area Summary SWM FACILITY, TYP.
(DA A- Water Quantity) / 525 _
Parking Lot (Existing & Proposed) 8,975 sf n / - 521
Sidewalk & Walkways (Existing) 950 sf
9,925 sf
Proposed Impervious Area Summary
I Design Storm Year= * 10
(DA B- Water Quantity)
Parking Lot (Existing & Proposed) 30,225 sf POINT DOWNSTREAM DRAIN RUNOFF CA INLET RAIN RUNOFF INVERT LENGTH SLOPE CIA CAPA- VEL FLOW
Sidewalk &Walkways (Existing &Proposed) 1,950 sf NOTE, THE MAXIMUM PROPOSED STRUCTURE AREA COEFF. [NCR ACCUM TIME FALL Q ELEVATIONS CITY TIME
SLOPE IS 2:1 FOR THE SITE AND THE ACRES C MIN MIN C.F.S. UPPER LOWER FEET FT./FT. INCHES C.F.S. F.P.S. SEC
32,175 sf MAXIMUM PROPOSED SLOPE FOR
Water Quality- Defined by Limits of Disturbance THE SWM FACILITY IS 3:1 YD-1 1.07 0.70 0.75 0.75 6.50 621 4.03
EX-2IA 51650 515.90 34.50 0.0174 12 4.7 6.7 5.1
Road & Parking Lot (Existing & Proposed) 32,375 sf Ex-21A 021 0.75 0.16 0.91 6s9 6.18 4.99
Sidewalk & Walkways (Existing & Proposed) 2,625 sf -__ Lx-z] slsso sls.aa ItJ.os o.ozo9 z s.1 zs Is.l
� � � � EX-21 0.05 0.75 0.04 0.94 6.84 6.11 5:15
35,000 sf j --- - OUT 506.29 497.00 9.54 0.0777 24 63.1 1z.0 10.0
PROPOSED 35' WIDE GRASS LINED
EMERGENCY SPILLWAY W/ 4:2 SIDE
SLOPES & CREST ELEV.=529.66'
525 525
io' WIDE
DAM EL
TY
WATERSHED SUMMARY
Pre -Development
POST -DEVELOPMENT SWM PLAN:
/ / I -EXISTING-STORM SEWER \
PROPOSED LIMITS OF DISTURBANCE (TO REMAIN) SURROUNDING
- (1.25ac)BOUNDARY ISUSED TODEFINE THE SITE & DIRECTING ITS / \
/ THE LIMITS OF THE VRRM WATER RUNOFF TO AN EXISTING
EXISTING STORM SEWER//-' �' QUALITY CALCULATIONS BOUNDARY - - --- SWM FACILITY, TYP. /
(TO REMAIN) SURRpUNDING �- -
THE SITE & DIRE Q NG ITS
RUNOFF TO AN EXISTING
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(TO REMAIN) SURROUNDING - / I / \ \ 520 \.
THE SITE & DIRECTING ITS
RUNOFF TO AN EXISTING
Proposed Impervious Area Summary SWM FACILITY, TYP.
(DA A- Water Quantity) / 525 _
Parking Lot (Existing & Proposed) 8,975 sf n / - 521
Sidewalk & Walkways (Existing) 950 sf
9,925 sf
Proposed Impervious Area Summary
I Design Storm Year= * 10
(DA B- Water Quantity)
Parking Lot (Existing & Proposed) 30,225 sf POINT DOWNSTREAM DRAIN RUNOFF CA INLET RAIN RUNOFF INVERT LENGTH SLOPE CIA CAPA- VEL FLOW
Sidewalk &Walkways (Existing &Proposed) 1,950 sf NOTE, THE MAXIMUM PROPOSED STRUCTURE AREA COEFF. [NCR ACCUM TIME FALL Q ELEVATIONS CITY TIME
SLOPE IS 2:1 FOR THE SITE AND THE ACRES C MIN MIN C.F.S. UPPER LOWER FEET FT./FT. INCHES C.F.S. F.P.S. SEC
32,175 sf MAXIMUM PROPOSED SLOPE FOR
Water Quality- Defined by Limits of Disturbance THE SWM FACILITY IS 3:1 YD-1 1.07 0.70 0.75 0.75 6.50 621 4.03
EX-2IA 51650 515.90 34.50 0.0174 12 4.7 6.7 5.1
Road & Parking Lot (Existing & Proposed) 32,375 sf Ex-21A 021 0.75 0.16 0.91 6s9 6.18 4.99
Sidewalk & Walkways (Existing & Proposed) 2,625 sf -__ Lx-z] slsso sls.aa ItJ.os o.ozo9 z s.1 zs Is.l
� � � � EX-21 0.05 0.75 0.04 0.94 6.84 6.11 5:15
35,000 sf j --- - OUT 506.29 497.00 9.54 0.0777 24 63.1 1z.0 10.0
1-year
2-year Flow,
10-year Flow,
CN
Area, ac.
Flow, cfs
cfs
Cfs
DA A (Present)
90
0.70
2.22
2.86
4.83
DA B (Present)
63
0.63
0.32
0.61
1.64
77
1.33
2.54
3.47
6.47
Post -Development
1-year
2-year Flow,
10-year Flow,
CN
Area, ac.
Flow, cfs
cfs
Cfs
DAA (Developed)
93
0.26
0.94
1.19
1.94
DA B (Developed)
87
1.07
0.25
0.28
4.13
88
1.33
1.19
1.47
6.06
STORMWATER MANAGEMENT NARRATIVE
OVERVIEW:
THIS PROJECT COMPLIES WITH PART IIB SWM REQUIREMENTS. TWO BEST MANAGEMENT
PRACTICES ARE PROPOSED TO OFFSET THE IMPACTS FROM THE PROPOSED DEVELOPMENT.
WATER QUALITY SUMMARY
THE STORMWATER QUALITY REQUIREMENTS FOR THIS DEVELOPMENT ARE MET THROUGH
Q Q
THE BEST MANAGEMENT PRACTICE OF PURCHASING NUTRIENT CREDITS. THE VRRM
SPREADSHEET's BOUNDARY IS DEFINED BY THE LIMITS OF DISTURBANCE AND 0.97 Ibs/yr
OF PHOSPHOROUS IS REQUIRED TO BE MITIGATED.. PLEASE SEE THE ACCOMPANYING
'STORMWATER MANAGEMENT CALCULATIONS PACKET' FOR ADDITIONAL DETAILS.
0+50 1+00 1+50 1+75 0+50 WATER QUANTITY SUMMARY
THE INSTALLATION OF A DETENTION BASIN IS THE SECOND BEST MANAGEMENT PRACTICE
PROPOSED. THE DETENTION BASIN WILL ATTENUATE FLOWS FROM THE PROPOSED
TOP OF
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DEVELOPMENT, BEFORE IT IS RELEASED INTO THE DOWNSTREAM STORM SEWER. PLEASE
SWM SPILLWAY SEE THE ATTACHED 'STORMWATER MANAGEMENT CALCULATIONS PACKET' FOR ADDITIONAL
DETAILS PERTAINING TO CHANNEL AND FLOOD PROTECTION COMPLIANCE.
GENERAL SWM NOTES:
1. STATE APPROVED TRASH RACKS AND ORIFICES SHALL BE INSTALLED ON
ALL ORIFICE OPENINGS. SEE DETAILS ON THIS SHEET AND THE
FOLLOWING SHEET OR EQUIVALENT FOR INSTALLATION.
2. CONCRETE FOUNDATIONS SHALL BE INSTALLED ON ALL RISER
STRUCTURES MEETING MINIMUM VESCH 3.14 SPECIFICATIONS.
3. CONTRACTOR SHALL HIRE ATHIRD PARTY GEOTECHNICAL ENGINEER TO
ENSURE THE EMBANKMENTS ARE STRUCTURALLY SOUND. THE
EMBANKMENTS SHALL HAVE A COMPACTED CLAY CORE WITH A CUTOFF
TRENCH & BE IN ACCORDANCE WITH THE DETAILS SHOWN IN THIS PLAN.
BERMS AND SPILLWAYS SHALL BE STABILIZED WITH EC-3 MATTING AND
THE REMAINING DISTURBED EMBANKMENT SLOPES SHALL BE STABILIZED
WITH EC-2 MATTING. ALL BERM FILL MATERIAL SHALL CONSIST OF ML, CL,
SC OR GC SOILS & BE FREE OF WOOD, ROOTS, ROCKS OR ANY OTHER NON
COMPACTING SOIL. COMPACTED FILL SHALL BE PROCTOR MAXIMUM DRY
DENSITY ASTM D698 AND HAVE A MINIMUM OF 95%OF MAXIMUM DRY
DENSITY AND 20/0 OF OPTIMUM MOISTURE CONTENT. ALL EXISTING AND
PROPOSED FILL MATERIAL AND PROPOSED CONSTRUCTION SHALL BE
APPROVED BYAN ONSITE GEOTECHNICAL ENGINEER PRESENT DURING
THE CONSTRUCTION OFTHE EMBANKMENTS AND FILL AREAS, AND
PRESENT DURING THE CORE SAMPLING.
4. THE DOWNSTREAM EMBANKMENT SIDE SLOPES OF ALL PERMANENT
FACILITIES SHALL HAVE A MAXIMUM 3:1 SLOPE.
StormRax TM
ROUND SERIES TRASH RACK
CONCRETE MANHOLE
STANDARD SO INCH RACK SHOWN
DIMENSIONS IN INCHES
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PLAN
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DIM C
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65%
60
70
CONCRETE STROCTURE DIMENSIONS
INSIDE STRUCTURE DIMENSION
OUTSIDE STRUCTURE DIMENSION
AVAILABLE OPTIONS
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DETENTION BASIN CONSTRUCTION NOTES:
FACILITY PLANTING SPECIFICATIONS:
1. THE DETENTION BASIN SHALL HAVE TURF GROUND COVER, SUCH AS GRASS, MULCH OR SOME OTHER FORM OF A VEGETATIVE GROUNDCOVER. LANDSCAPING
BEYOND THIS IS OPTIONAL AND IS NOT REQUIRED.
2. THE PROPOSED INTERIOR SIDE SLOPES OF THE BASIN SHALL BE A MAXIMUM OF 2:1 TO REDUCE THE RISK OF EROSION. THE PROPOSED FLOOR SLOPES SHALL BE
GRADED TO PROVIDE POSITIVE DRAINAGE AT ALL TIMES TO THE RISER STRUCTURE.
3. WOODY VEGETATION SHALL NOT BE PLANTED OR ALLOWED TO GROW WITHIN 15 FEET OF THE TOE OF THE EMBANKMENT NOR WITHIN 25 FEET OF THE
PRINCIPAL SPILLWAY STRUCTURE.
4. THE SOILS IN THE STORMWATER BUFFER AREA ARE OFTEN SEVERELY COMPACTED DURING THE CONSTRUCTION PROCESS, TO ENSURE STABILITY THE DENSITY
OF THESE COMPACTED SOILS CAN BE SO GREAT THAT IT EFFECTIVELY PREVENTS ROOT PENETRATION AND, THEREFORE, MAY LEAD TO PREMATURE MORTALITY
OR LOSS OF VIGOR. AS A RULE OF THUMB, PLANTING HOLES SHOULD BE THREE TIMES DEEPER AND WIDER THAN THE DIAMETER OF THE ROOTBALL FOR
BALL -AND -BURLAP STOCK, AND FIVE TIMES DEEPER AND WIDER FOR CONTAINER -GROWN STOCK.
S. AVOID SPECIES THAT REQUIRE FULL SHADE, OR ARE PRONE TO WIND DAMAGE. EXTRA MULCHING AROUND THE BASE OF TREES AND SHRUBS IS STRONGLY
RECOMMENDED AS A MEANS OF CONSERVING MOISTURE AND SUPPRESSING WEEDS.
1. THE CONTRACTOR SHALL BE RESPONSIBLE FOR LAYOUT OF ALL WORK COVERED UNDER THESE PLANS.
2. LANDSCAPE CONTRACTOR SHALL REFER TO THE STANDARDIZED LANDSCAPE SPECIFICATIONS FOR THE STATE OF VIRGINIA FOR ADDITIONAL INFORMATION.
THE CONTRACTOR SHALL ABIDE BY ITS CONTENTS; HOWEVER ANY NOTES OR SPECIFICATIONS ON THE PLANS SHALL SUPERSEDE THOSE OUTLINED IN THE
SPECIFICATIONS MANUAL (COPIES ARE AVAILABLE FOR A FEE FROM THE VIRGINIA CHAPTER OF THE AMERICAN SOCIETY OF LANDSCAPE ARCHITECTS, VIRGINIA
NURSERYMEN'S ASSOCIATION, INC. AND THE VIRGINIA SOCIETY OF LANDSCAPE DESIGNERS). ALL DISCREPANCIES SHALL BE BROUGHT TO THE ATTENTION OF
COLLINS ENGINEERING PRIOR TO THE CORRESPONDING CONSTRUCTION ACTIVITY.
3. ALL PLANT MATERIAL SHALL MEET THE MINIMUM SPECIFICATIONS AND STANDARDS DESCRIBED IN THE CURRENT ISSUE OF THE AMERICAN STANDARD FOR
NURSERY STOCK, PUBLISHED BY THE AMERICAN ASSOCIATION OF NURSERYMEN, 1250 STREET, NW, SUITE 500, WASHINGTON, DC 20005.
4. THE CONTRACTOR SHALL VERIFY ALL DIMENSIONS IN THE FIELD AND NOTIFY THE DESIGNER OF ANY VARIANCE FROM THE PLAN.
5. THE LANDSCAPE CONTRACTOR IS RESPONSIBLE FOR VERIFYING THE LOCATION OF ANY ONSITE UTILITIES (CALL MISS UTILITY 1-800-552-7001 BEFORE ANY
EXCAVATION).
6. REFER TO THE APPROVED FINAL SITE PLANS FOR ANY DETAILED SITE INFORMATION.
7. ALL WORK SHALL BE COORDINATED WITH OTHER PARTIES.
8. PLANTS WILL BE PREPARED FOR SHIPMENT IN A MANNER THAT WILL NOT CAUSE DAMAGE TO THE BARK BUDS BRANCHES STEMS OR OVERALL SHAPE OF
THE STOCK. CONTAINER GROWN PLANTS WILL BE TRANSPORTED IN THE CONTAINERS IN WHICH THEY HAVE GROWN.
9. ALL PLANT MATERIAL UNLESS OTHERWISE SPECIFIED SHALL BE UNIFORMLY BRANCHED AND HAVE A VIGOROUS ROOT SYSTEM. PLANT MATERIAL SHALL BE
HEALTHY, VIGOROUS, AND FREE FROM DEFECTS, DECAY, DISEASES, INSECT PEST EGGS, AND ALL FORMS OF INFESTATION. ALL PLANT MATERIALSHALL BE
FRESH, FREE FROM TRANSPLANT SHOCK OR VISIBLE WILT. PLANTS DEEMED UNHEALTHY WILL BE REJECTED.
10. ALL CONTAINER STOCK SHALL HAVE BEEN PROPAGATED IN A CONTAINER LONG ENOUGH FOR THE ROOT SYSTEM TO HAVE DEVELOPED SUFFICIENTLY TO HOLD
ITS SOIL. CONTAINER STOCK WITH POORLY DEVELOPED ROOT SYSTEMS WILL NOT BE ACCEPTED.
11. PLANTS NOT INSTALLED ON THE DAY OF ARRIVAL ON SITE SHALL BE STORED AND PROTECTED BY THE CONTAINER. OUTSIDE STORAGE AREAS WILL BE SHADED
AND PROTECTED FROM THE WIND AND SUN. PLANTS STORED ON SITE SHALL BE PROTECTED FROM ANY DRYING ATALLTIMES BY COVERING THE BALLS OR
ROOTS WITH MOIST SAWDUST WET BURLAP WOOD CHIPS SHREDDED BARK PEAT MOSS OR OTHER SIMILAR MULCHING MATERIAL.
12. THE OWNER RESERVES THE RIGHT TO SUBSTITUTE PLANT MATERIAL TYPE, SIZE AND/OR QUANTITY. ANY SUBSTITUTIONS MUST BE APPROVED BY THE
INSPECTOR INITIALLY, AND THEN THE DESIGNER.
13. MINOR FIELD ADJUSTMENTS MAYBE NECESSARY DUE TO SITE CONDITIONS (EX: ROOTBALL AND UTILITY CONFLICT). MAJOR ADJUSTMENTS MUST BE
APPROVED BY THE DESIGNER.
14. NO PLANTING SHALL OCCUR WHEN THE SOIL IS FROZEN.
15. PLANT MATERIAL SHALL BE PLACED IN EXISTING SOIL WITH EACH PLANTING PIT EXCAVATED TO A SIZE SUFFICIENTTO CONTAIN THE ENTIRE ROOT BALL OR
ROOT MASS, WITHOUT CRAMPING ROOT STOCK.
16. THE CONTRACTOR SHALL MAINTAIN A ONE (1) CALENDAR YEAR 90% CARE AND REPLACEMENT WARRANTY FOR ALL PLANTINGS. THE PERIOD OF CARE AND
REPLACEMENT SHALL BEGIN AFTER INSPECTION AND APPROVAL OF THE COMPLETE INSTALLATION OF ALL PLANTS AND CONTINUE FOR ONE CALENDAR YEAR.
17. THE CONTRACTOR IS RESPONSIBLE FOR REMOVAL AND DISPOSAL OF TRASH AND DEBRIS WITHIN THE LIMITS OF THE PLANTING ON A DAILY BASIS.
18. THE CONTRACTOR WILL NOT BE RESPONSIBLE FOR PLANT MATERIAL THAT HAS BEEN DAMAGED BY VANDALISM, FIRE, OR OTHER ACTIVITIES BEYOND THE
CONTRACTOR's CONTROL.
FACILITY CONSTRUCTION
1. THE DETENTION BASIN MAY SERVE AS A SEDIMENT BASIN AND/OR TRAP DURING PROJECT CONSTRUCTION. IF THIS IS DONE, THE VOLUME SHALL BE BASED ON
THE MORE STRINGENT SIZING RULE (EROSION AND SEDIMENT CONTROL REQUIREMENTS VS. STORMWATER TREATMENT REQUIREMENTS). INSTALLATION OF
( Q
THE PERMANENT RISER SHALL BE INITIATED DURING THE CONSTRUCTION PHASE AND DESIGN ELEVATIONS SHALL BE SET WITH FINAL CLEANOUT OFTHE
SEDIMENT BASIN AND CONVERSION TO THE POST -CONSTRUCTION POND IN MIND. APPROPRIATE PROCEDURES SHALL BE IMPLEMENTED TO PREVENT
DISCHARGE OF TURBULENT WATERS WHEN THE BASIN IS BEING CONVERTED TO AN DETENTION BASIN.
2. THE DETENTION BASIN SHALL ONLY BE CONSTRUCTED AFTER THE CONTRIBUTING DRAINAGE AREA TO THE POND IS COMPLETELY STABILIZED. IFTHE
PROPOSED POND SITE WILL BE USED AS A SEDIMENT TRAP OR BASIN DURING THE CONSTRUCTION PHASE, THEN THE FACILITY WILL BE DEWATERED, DREDGED
AND RE -GRADED TO DESIGN DIMENSIONS AFTER THE ORIGINAL SITE CONSTRUCTION IS COMPLETE.MODIFICATIONS SHALL BE MADE TO THE RISER, ORIFICES
AND BARRELS AS REQUIRED SO THAT THEY ARE CONSISTENT WITH THE FINAL CONSTRUCTION SPECIFICATIONS.
3. THE CONTRACTOR SHALLASSEMBLE CONSTRUCTION MATERIALS ON -SITE, MAKING SURE THEY MEET DESIGN SPECIFICATIONS AND ARE PREPARED AT STAGING
AREAS WHEN POSSIBLE.
4. THE CONTRACTOR SHALL CLEAR AND STRIP THE PROJECTAREA IF REQUIRED TO THE DESIRED SUB -GRADE.
5. INSTALL E&S CONTROLS PRIOR TO CONSTRUCTION OF THE BASIN, INCLUDING TEMPORARY DE -WATERING DEVICES AND STORMWATER DIVERSION PRACTICES.
ALL AREAS SURROUNDING THE BASIN THAT ARE GRADED OR DENUDED DURING CONSTRUCTION SHALL BE PLANTED WITH TURF GRASS, NATIVE PLANTINGS,
OR OTHER APPROVED METHODS OF SOIL STABILIZATION.
6. CONTRACTOR SHALL EXCAVATE THE CORE TRENCH AND INSTALL THE SPILLWAY PIPE DURING THE ESC PHASE.
7. CONTRACTOR SHALLALSO INSTALLTHE RISER, OUTFLOW STRUCTURE AND/OR THE BARREL(s) WITH PERMANENT COLLARS DURING THE ESC PHASE TO ENSURE
THE TOP INVERT OF THE OVERFLOW WEIR IS CONSTRUCTED LEVELATTHE DESIGN ELEVATION.
8. THE CONTRACTOR SHALL CONSTRUCT THE EMBANKMENT AND ANY INTERNAL BERMS IN 8-TO 12-INCH LIFTS, COMPACTION SHALL BE COMPLETED IN LIFTS
WITH APPROPRIATE EQUIPMENT. THE CONTRACTOR SHALLALSO ADHERE TO THE CLAY LINER SPECIFICATIONS OUTLINED IN TABLE 14.4 BELOW:
Table 14.4. Clay Inner specifications
Property
Permeability
Test Method
ASTM D-2434
U"
CmSec
Specification
1 X 10
Plasticity Index of Gay
ASTM D-4231424
%
Not less than 15
Liquid Limit of Ga
ASTM D-2216
%
Not less than 30
Clay Particles Passing
ASTM D-422
%
Not less than 30
Clay Com ction
ASTM D2216
%
95% of standard proctor dens It
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9. UPON COMPLETION OFTHE EMBANKMENT GRADING, THE CONTRACTOR SHALL EXCAVATE/GRADE UNTIL THE APPROPRIATE ELEVATION AND DESIRED
CONTOURS ARE ACHIEVED FOR THE BOTTOM AND SIDE SLOPES OF THE BASIN.
10. CONTRACTOR SHALLTHEN CONSTRUCT THE EMERGENCY SPILLWAY IN CUT OR STRUCTURALLY STABILIZED SOILS.
11. THE CONTRACTOR SHALLTHEN FINISH CONSTRUCTION OF ALL OUTLET STRUCTURES, INCLUDING DOWNSTREAM RIP -RAP APRON PROTECTION.
12. THE CONTRACTOR SHALL NEXT STABILIZE EXPOSED SOILS BY HYDROSEEDING OR SEEDING OVER STRAW.
13. THE CONTRACTOR SHALLTHEN INSTALLTHE APPROPRIATE BASIN LANDSCAPING IN ACCORDANCE WITH THE APPROVED PLANS.
FACILITY MAINTENANCE:
MAINTENANCE OF THE DETENTION BASIN IS DRIVEN BY ANNUAL INSPECTIONS THAT EVALUATE THE CONDITION AND PERFORMANCE OF THE FACILITIES. DURING
THESE INSPECTIONS THE FOLLOWING TASKS SHALL BE PERFORMED BY THE CONTRACTOR IN THE FIRSTYEAR FOLLOWING INSTALLATION, AND THE OWNER
THEREAFTER:
1. MEASURE SEDIMENT ACCUMULATION LEVELS IN THE BASIN.
2. MONITOR THE GROWTH OF THE GROUNDCOVER AND ANY TREES AND SHRUBS PLANTED, AS APPLICABLE. RECORD THE SPECIES AND THEIR APPROXIMATE
COVERAGE, AND NOTETHE PRESENCE OF ANY INVASIVE PLANT SPECIES, AS APPLICABLE.
3. INSPECTTHE CONDITION OF STORMWATER INLETS TO THE BASIN FOR MATERIAL DAMAGE, EROSION OR UNDERCUTTING.
4. INSPECT THE BANKS OF UPSTREAM AND DOWNSTREAM CHANNELS FOR EVIDENCE OF SLOUGHING, ANIMAL BURROWS, BOGGYAREAS, WOODY GROWTH, OR
GULLY EROSION THAT MAY UNDERMINE EMBANKMENT INTEGRITY.
5. INSPECT BASIN OUTFALL CHANNEL FOR EROSION, UNDERCUTTING, RIP -RAP DISPLACEMENT, WOODY GROWTH, etc.
6. INSPECT CONDITION OF PRINCIPAL SPILLWAY AND RISER FOR EVIDENCE OF SPALLING, JOINT FAILURE, LEAKAGE, CORROSION OR OTHER FAILURES.
7.. INSPECT CONDITION OF ALLTRASH RACKS, REVERSE SLOPED PIPES OR FLASHBOARD RISERS FOR EVIDENCE OF CLOGGING, LEAKAGE, DEBRIS ACCUMULATION
OR OTHER FAILURES.
8. INSPECT MAINTENANCE ACCESS TO ENSURE IT IS FREE OF WOODY VEGETATION, AND CHECK TO SEE WHETHER VALVES, MANHOLES AND LOCKS CAN BE
OPENED AND OPERATED.
9. INSPECT INTERNAL AND EXTERNAL SIDE SLOPES OFTHE BASIN FOR EVIDENCE OF SPARSE VEGETATIVE COVER, EROSION., OR SLUMPING.
10. OWNER OR CONTRACTOR SHALL MAKE NEEDED REPAIRS IMMEDIATELY.
FACILITY INSPECTION:
MULTIPLE INSPECTIONS ARE CRITICALTO ENSURE THE BASIN(s) ARE PROPERLY CONSTRUCTED. BECAUSE THE TIMING OF THE INSTALLATION IS DICTATED BYTHE
CONTRACTOR, THE CONTRACTOR SHALL BE RESPONSIBLE FOR CONTACTING THE ENGINEER AND INSPECTOR PRIOR TO INSTALLATION. MULTIPLE SITE VISITS AND
INSPECTIONS ARE REQUIRED TO BE SCHEDULED BY THE CONTRACTOR WITH THE ENGINEER AND INSPECTOR DURING THE FOLLOWING STAGES OF THE DETENTION
BASIN's CONSTRUCTION PROCESS:
1. PRE -CONSTRUCTION MEETING
2. INITIALSITE PREPARATION (INCLUDING INSTALLATION OF PROJECT E&S CONTROLS)
3. EXCAVATION/GRADING (e.g., INTERIM/FINAL ELEVATIONS)
4. DETENTION BASIN INSTALLATION (e.g., INTERIM AND FINAL ELEVATIONS)
5. INSTALLATION OFTHE EMBANKMENT, THE RISER/PRIMARY SPILLWAY, AND THE OUTLET STRUCTURE(s).
6. PLANTING PHASE (WITH AN EXPERIENCED LANDSCAPE ARCHITECT PRESENT/DIRECTING IFAPPLICABLE)
7. FINAL INSPECTION (DEVELOP A PUNCH LIST FOR FACILITY ACCEPTANCE)
EMBANKMENT NOTES:
AFTER AN INVESTIGATION OF THE SITE's SOILS, SITE VISITS; AN ANALYSIS OF THE SURVEYED TOPOGRAPHY AND AN
EXAMINATION OF VA DEQ APPENDIX A: EARTHEN EMBANKMENT, THE APPLICANT HAS PROVIDED A COMPREHENSIVE
EMBANKMENT DESIGN THAT DOES NOT NEED A GEOTECHNICAL STUDY ATTHIS TIME. SUCH IS THE CASE DUE TO THE
PRECAUTIONARY EMBANKMENT DESIGNS PROPOSED. A SUMMARY OF THE EMBANKMENT DESIGN REQUIREMENTS
ARE LISTED BELOW, MANDATING THE CONTRACTOR MEET THESE REQUIREMENTS AT A MINIMUM.
THE EMBANKMENTS SHALL HAVE A COMPACTED CLAY CORE WITH A CUTOFF TRENCH & BE IN ACCORDANCE WITH THE
DETAILS SHOWN ON IN THIS PLAN. BERMS AND SPILLWAYS SHALL BE STABILIZED WITH EC-3 MATTING & THE
REMAINING DISTURBED SLOPES SHALL BE STABILIZED WITH EC-2 MATTING. ALL BERM FILL MATERIAL SHALL CONSIST
OF ML, CL, SC OR GC SOILS & BE FREE OF WOOD, ROOTS, ROCKS OR ANY OTHER NON COMPACTING SOIL COMPACTED
FILL SHALL BE PROCTOR MAXIMUM DRY DENSITY ASTM D698 AND HAVE A MINIMUM OF 95% OF MAXIMUM DRY
DENSITY AND 2%OF OPTIMUM MOISTURE CONTENT. ALL FILL MATERIAL AND CONSTRUCTION SHALL BE APPROVED BY
AN ONSITE GEOTECHNICAL ENGINEER PRESENT DURING THE CONSTRUCTION OF THE EMBANKMENTS AND FILL AREAS,
General Construction notes for Stormwater Management Plans
1. All dams and constructed fill to be within 95% of
maximum dry density and 2% of optimum moisture
content. All fill material to be approved by a geotechnical
engineer. A geotechnical engineer is to be present during
construction of dams.
2. Pipe and riser joints are to be watertight within
stormwater management facilities.
3. For temporary sediment traps or basins which are to be
converted to permanent stormwater management facilities;
conversion is not to take place until the site is stabilized,
and permission has been obtained from the County erosion
control inspector.
COUNTY OF ALBEMARLE
Department of Community Development
r'Y�Ly1P
Construction Record Drawings (As -built) for VSMP
The following is a list of information required on construction record drawings for
stormwater facilities (reference Water Protection Ordinance 17-422). It is preferable that the
construction record drawing be prepared by someone other than the designer. Please do not
provide design drawings as construction record drawings.
A. A signed and dated professional seal of the preparing engineer or surveyor.
B. The name and address of the firm and individual preparing the drawings on the title sheet.
C. The constructed location of all items associated with each facility, and the inspection records to verify
proper dimensions, materials and installation. The items include, but are not limited to the following:
1. Inspection Records and photographs for pipe trenches and bedding, including underdrains.
2. Video Pipe Inspection for any pipes which are not accessible or viewable.
3. Updated Location with eo-coordinates of all facilities.
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4. Verified Drainage Area maps for the drainage area treated, and for drainage to the facilities.
5. Current physical and topographic survey for all earthen structures. Ponds should include a survey
of the pond bottom. Surveys should verify pond volumes are per design. Corrections may be required
for alterations from the design.
6. Plants, location and type.
7. Plans and profiles for all culverts, Pipes, Risers, Weirs and Drainage Structures - Display the
installed type of drainage structures, culvert/pipe size, weirs, materials, inlets or end treatment(s),
inlet and outlet protection, alignment and invert elevations compared to design.
8. Computations: For significant deviations from design, provide sealed computations verifying that
the as -built condition is equivalent or better than design.
9. Ditch Lines - Display the constructed location of all ditch lines and channels, including typical
sections and linings.
10. Easements - Show all platted easements with dead book references labeled. Facilities and drainage
must be within platted easements. Provide copies of recorded documents.
11. Guardrail, fences or other safety provisions - Display the constructed location of all safety
provisions; fences, guardrail, including the type, length and applied end treatments, compared to
design.
12. Material layers - biofilter media, stone layers, sand layers, keyways and cores must be verified as to
material types and depths. Include inspection reports, boring or test pit reports and materials
certifications. Biofilter media must be an approved state mix.
13. Access roads - show location of access roads, surface treatment, drainage, etc, as applicable.
14. Compaction reports are required to verify fill compaction in dams.
15. Manufacturers certifications for proprietary BMP's certifying proper installation and functioning.
s
1 /2" zinc plated hook
attached with 11/8' fastener
2-1 8' die. toles
Isometric
/1/4' HDPE plate (opltoAal)
HDPR strucluran plastic with
T
2-1/13" holes and 1/4" plate
O manufactured by Plastic
7_ Solutions Inc. or equal
i ..t3r!"tratYe,a - - shown with optional plate
HOPE sl=uchiral plastle with
2-1/8" holes and 114' plate
Section manufactured by Plastic
Solulsone Inc or equal
5/8" dia hole
O O
single BMP/ FAievi1Li Can
orifice
PLASTIC
SOLUTIONS P.O. Box 43IIe
DEBRIS CAGE Winchester VA 22e0
INC. 877-877-5727
rrr.plaMie-ralld,aa eels
DETENTION BASIN DETAIL:
SC4LE1"=20'
SEE SHEET 6 FOR SCALED PROFILES-� '
'OFTHE.SWNI FACILITY, TYP_ PROPOSED 35' WIDE GRASS LINED °\
EMERGENCY SPILLWAY W/ 4:1 SIDE �
-- -- SLOPES` CREST ELEV.=Sig.66'' -
_ PROPOSED 33.10'OF 012" HOPE WITH A STONE BED ---- -
0+00 520 0+50 FOUNDATION MEETING MINIMUM PIPE MANUFACTURER
REQUIREMENTS. (S= i.&%, INV IN=5i6.50; INV OUT=5i5.9o')
PROPOSED YD-i (024" HOPE STANDPIPE w/ TRASH
--------- ------ _ _ to RACK) SHALL SERVE AS THE RISER STRUCTURE.
- -- o SEE TRASH RACK DETAIL ON THIS SHEET. RISER "
5i9 STRUCTURE SHALL HAVE A RIM ELEV.=Si8.66' _ =
t + - WITH ONF(x) 03" LOW FLOW ORIFICE (INV=5;6_5o')-'
--0+00 - S20 io'WIDETOPOFDAM
ELEV.=52o', TYP.
E . STIR. 22-
O
PROPOSED io' WIDE GRADED SAFETY BENCH WITH
A2% MAXIMUM CROSS SLOPE. SAFETY BENCH TO
BE LOCATED AT THE TOP OF THE FACILITY.
Ss SINN,\ ,
L NE
CONT ACTOR A L CON CT - SH
\ � ' PRO SED DETENTION BASIN's PROPOSED BASIN's FLOOR SHALL BE SLOPED
i� \ j \ n
„ X TO DRAIN TO THE RISER (o.5o /a MIN.).
OUTFALL INTO EXISTING STIR.2iA Q
\., 0 CONTRACTOR SHALL INSTALL AGENTLY
d
SLOPED CHANNEL ATTHE BASIN's LOW POINT
IN/ TO ENSURE POSITIVE DRAINAGE THROUGHOUT.
U�
I
/In
/II+73
Perforated a
SECTION A-9: TI'PICAL GRAPffiCAL DETAILS
f Homogerrleous fill
i�/t//✓� /. 4 min
Cut off trench-V below suitable
materia 1
TYPICAL HOMOGENEOUS
EMBANKMENT
SIUIS
FOUNDATION DRAIN
drain
SWA Wow of "Xi
cow
1�4
_�llod lift
�Trunsilion filler
CHIMNEY DRAIN
Transition fill
,,ROCk Or aravel
Blanket drain
BLANKET DRAIN
Rock or growl
drain
Tron3ition filter
TONE DRAIN
Figure A-Ia. Homogeneous Enebankments sr .Seepage Corltsols
I1
SCOTT/R. CZTLLINS'Z
No. 35791 112�1
p 09/08/20��
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SCALE
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SHEET NO.
7