HomeMy WebLinkAboutWPO202000055 Plan - Submittal (First) WPO VSMP 2020-12-07GENERAL NOTES
OWNER: WHITE GABLES CHARLOTTESVILLE LC c/o
ROBINSON DEV GROUP INC
150 WEST MAIN STREET, SUITE 1100
NORFOLK, VA 23510 WHITE GABLES VSMP PLAN AMENDMENT
ENGINEER:
COLLINS ENGINEERING
200 GARRETT ST, SUITE K
CHARLOTTESVILLE, VA 22902
(434)293-3719
TAX MAP NO.:
06000-00-00-02600 DB 2660 PG 218
TOTAL PROJECT AREA:
TOTAL SITE AREA: 3.44 ACRES (PROJECT AREA: 2.28 ACRES)
ZONING:
C-O (COMMERCIAL OFFICE) WITH SPECIAL USE PERMIT ALLOWING RESIDENTIAL
(MULTI -FAMILY) (SP-02-023). MANAGED SLOPES OVERLAY DISTRICT & ENTRANCE
CORRIDOR OVERLAY DISTRICT
TOPO & SURVEY:
SURVEY PROVIDED BY ROGER RAY & ASSOC, INC. TOPOGRAPHY IS FIELD SURVEY
PERFORMED BY ROGER RAY & ASSOC, INC. IN JANUARY, 2009 AND UPDATED IN
FEBRUARY 2020. TOPO FIELD VERIFIED BY COLLINS ENGINEERING IN JULY 2020.
DATUM:
NAD83, NAVD 88
EXISTING TERRAIN:
PROJECT AREA IS CURRENTLY A GRASS & WOODED AREA ADJACENT TO
COMPLETED PHASES OF THE RESIDENTIAL NEIGHBORHOOD
EXISTING DEVELOPMENT:
(3) MULTI -FAMILY CONDOMINIUM BUILDINGS EACH WITH (10) DWELLING UNITS
FOR A TOTAL OF 30 RESIDENTIAL UNITS
PROPOSED:
(3) MULTI -FAMILY CONDOMINIUM BUILDINGS EACH WITH (14) DWELLING UNITS
FOR A TOTAL OF 42 RESIDENTIAL UNITS WITHIN THIS PHASE.
DENSITY:
TOTAL ALLOWABLE DENSITY PER REQUIREMENTS OF THE SPECIAL USE PERMIT IS
76 RESIDENTIAL DWELLING UNITS. CURRENTLY THERE IS 30 EXISTING
RESIDENTIAL UNITS AND THIS PROJECT PROPOSES 42 RESIDENTIAL UNITS FOR
A TOTAL OF 72 DWELLING UNITS ON THE SITE.
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:
NONE WITH THIS SITE PLAN AMENDMENT
BUILDING HEIGHTS:
60 FOOT HT MAXIMUM ALLOWED, 60' MAX. HT PROPOSED
SETBACKS:
SEE SHEETS 2, 3, AND 4 FOR THE EXISTING 50' REAR SETBACK, 30' FRONT
SETBACK, AND 215' FRONT BUILDING SETBACK
SUBDIVISION STREETS:
EXISTING PRIVATE STREETS (PART OF THE OVERALL DEVELOPMENT)
UTILITIES (WATER AND SEWER): COUNTY PUBLIC WATER AND SANITARY SEWER
AGRICULTURAL/ FORESTAL DISTRICT: NONE
LIGHTING:
SEE LIGHTING PLAN PROVIDED WITH THIS SITE PLAN AMENDMENT. 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:
EACH OF THE (3) BUILDINGS SHALL HAVE INTERNAL TRASH BINS WITH A PRIVATE
TRASH SERVICE FOR COLLECTION.
PHASING:
THIS SITE SHALL BE DEVELOPED IN THREE PHASES, SEE PHASING PLAN SHEET 3.
PHASE I - BUILDING II
PHASE II - BUILDING IV
PHASE III - BUILDING VI
PARKING:
PARKING REQUIRED:
(2) SPACES PER RESIDENTIAL UNIT (ASSIGNED PARKING) + 1 SP/ 4 UNITS
FOR GUEST PARKING
1. (30) EXISTING RESIDENTIAL UNITS = 60 REQUIRED PARKING SPACES
2. (42) PROPOSED RESIDENTIAL UNITS = 84 REQUIRED PARKING SPACES
3. GUEST PARKING REQUIRED = 72 UNITS x 1 SP/4 UNITS = 18 SPACES REQUIRED
3. COMMERCIAL OFFICE BUILDING/HOUSE = 4 SPACES REQUIRED
TOTAL PARKING REQUIRED = 166 SPACES
PARKING PROVIDED:
1. GARAGE PARKING SPACES = 147 SPACES
20 GARAGE SPACES PER BUILDING (PAVILION I, III, & V) = 60 SPACES
29 GARAGE SPACES PER BUILDING (PAVILION II, IV, & VI) = 87 SPACES
(INC. 6 HAND. PARKING SPACES, PLUS (2) LOADING SPACES 12'x25')
2. ONSTREET PARALLEL PARKING SPACES = 26 SPACES
TOTAL PARKING PROVIDED = 173 SPACES + (2) LOADING SPACES
STREAM BUFFERS/FLOODPLAIN: NOT APPLICABLE WITH THIS SITE PLAN AMENDMENT
RETAINING WALLS:
(1) RETAINING WALL IS PROPOSED WITH THIS PLAN AMENDMENT, SEE GRADING
SHEET FOR INFORMATION.
RECREATION:
NOT APPLICABLE WITH THIS SITE PLAN AMENDMENT
LAND AREA (WITHIN 1.98 AC. LOD):
PARKING AND TRAVELWAYS 0.30 AC. (15.2%)
BUILDINGS: 0.81 AC. (40.9%)
SIDEWALKS: 0.02 AC. ( 1.0%)
TOTAL IMPERVIOUS AREA: 1.13 AC.
LAWN/OPEN SPACE AREA: 0.85 AC. (42.9%)
PAVED PARKING AND CIRCULATION
AREA: 12,875 SF
CRITICAL SLOPES:
SEE EXISTING CONDITIONS FOR THE LOCATION OF THE MANAGED SLOPES ON THE
PROPERTY.
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 DRY SWALES SHALL
BE CONSTRUCTED AS SHOWN ON THE GRADING AND DRAINAGE PLAN.
ADDITIONAL WATER QUALITY NUTRIENT CREDITS SHALL BE PURCHASED TO
ACHIEVE THE NECESSARY REMOVAL RATES FOR THE DEVELOPMENT. SEE VSMP
PLAN FOR FURTHER INFORMATION.
SCALE: 1" = 50'
(WP02020M
SAMUEL MILLER DISTRICT
ALBEMARLE COUNTY, VIRGINIA
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SPECIAL PERMIT CONDITIONS
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1. THE APPROVED FINAL SITE PLAN SHALL BE IN GENERAL ACCORD WITH THE CONCEPTUAL PLAN (JANUARY 10, 2003 REVISION)
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(THE "CONCEPTUAL PLAN") AND SPECIAL PERMIT JUSTIFICATION DATED APRIL 22, 2002. MODIFICATIONS TO THE DESIGN OF THE
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INTERIOR LOOP ROAD, APPROVED BY THE DIRECTOR OF ENGINEERING AND PUBLIC WORKS TO ACCOMMODATE FIRE TRUCKS,
SHALL BE DEEMED TO BE IN GENERAL ACCORD WITH THE CONCEPTUAL PLAN.
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2. AS SHOWN ON THE CONCEPTUAL PLAN, NO NEW STRUCTURES SHALL BE LOCATED IN THE FRONT (SOUTHERN) PORTION OF THE
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PROPERTY. THERE SHALL BE A MINIMUM DISTANCE OF TWO HUNDRED FIFTEEN (215) FEET BETWEEN THE SOUTHERN -MOST
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STRUCTURE AND THE FRONT (SOUTHERN) PROPERTY LINE.
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3. THE ENTRANCE ROAD SHOWN ON THE CONCEPTUAL PLAN SHALL BE CONSTRUCTED BY THE APPLICANT TO AN URBAN ROAD
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STANDARD FROM ITS JUNCTION WITH ROUTE 250 WEST TO THE INTERIOR LOOP, AND SHALL INCLUDE A SIDEWALK OR OTHER
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APPROPRIATE PEDESTRIAN PATH, CONSTRUCTED TO A STANDARD ACCEPTABLE TO THE DEPARTMENTS OF PLANNING AND
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COMMUNITY DEVELOPMENT AND ENGINEERING AND PUBLIC WORKS, ALONG ONE SIDE CONNECTING THE INTERIOR LOOP TO THE
PUBLIC SIDEWALK AT IVY ROAD.
4. ALL ROADS ON THE PROPERTY CONNECTING TO ADJACENT PROPERTIES AS SHOWN ON THE CONCEPTUAL PLAN SHALL BE
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CONSTRUCTED BY THE APPLICANT TO AN URBAN SECTION STANDARD, WITH A MINIMUM WIDTH OF TWENTY (20) FEET, FINAL
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WIDTH TO BE DETERMINED AT THE TIME OF FINAL SITE PLAN APPROVAL BY THE DIRECTOR OF ENGINEERING AND PUBLIC WORKS.
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ALL ROADS CONNECTING TO ADJACENT PROPERTIES SHALL INCLUDE A SIDEWALK OR OTHER APPROPRIATE PEDESTRIAN PATH
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ALONG ONE SIDE, CONSTRUCTED TO A STANDARD ACCEPTABLE TO THE DEPARTMENTS OF PLANNING AND ENGINEERING AND
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PUBLIC WORKS, PROVIDING A CONNECTION TO THE PUBLIC SIDEWALK
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S. AN ACCESS EASEMENT HAS BEEN DEDICATED ON THE SUBJECT PROPERTY FOR TRAFFIC FROM THE N/F KAPPA SIGMA PROPERTY
(TAX MAP 60, PARCELS 27 AND 27B, DB 2226-218, 225 PLAT & DB 2706-163, 168 & 169 PLAT). THIS ACCESS SHALL BE
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CONSTRUCTED BY THE APPLICANT TO THE SAME STANDARD AS REQUIRED IN CONDITION 4.
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6. A CONSOLIDATED ENTRANCE WILL BE LOCATED TO THE WEST OF THE WHITE GABLES PROPERTY ON THE N/F KAPPA SIGMA
PROPERTY TAX MAP 60 PARCELS 27 AND 27B AN ACCESS EASEMENT HAS BEEN DEDICATED TO CONNECT THE LEGAL RESEARCH
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GROUP PROPERTY (TAX MAP 50, PARCEL 25) TO THIS CONSOLIDATED ENTRANCE (DB 2226-218, 225 PLAT & DB 2706-163, 168 & 169
PLAT). )THE SEGMENT OF THE ACCESSWAY TO CONNECT THE WHITE GABLES PROPERTY TO THE LEGAL RESEARCH GROUP PROPERTY
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HAS BEEN CONSTRUCTED WITH THE PHASE II WHITE GABLES SITE PLAN. THE APPLICANT WILL CONTINUE TO WORK THE VIRGINIA
DEPARTMENT OF TRANSPORTATION (VDOT) AND THE COUNTY'S DIRECTOR OF ENGINEERING TO PHASE THE CONSTRUCTION OF THE
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RIGHT IN/RIGHT OUT ENTRANCE/EXIT ON THE WHITE GABLES PROPERTY TO REPLACE THE EXISTING ENTRANCE ONCE THE SAID
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CONSOLIDATED ENTRANCE IS CONSTRUCTED.
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7. WITHIN EACH PAVILION SHOWN ON THE CONCEPTUAL PLAN, THE LARGEST CONDOMINIUM UNIT SHALL BE AT LEAST THIRTY
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42 a /
(30) PERCENT LARGER, BASED ON FLOOR AREA, THAN THE SMALLEST UNIT WITHIN THE SAME PAVILION.
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8. THE APPLICANT SHALL COMPLY WITH ALL REQUIREMENTS OF THE VDOT RELATED TO DESIGN AND CONSTRUCTION OF THE
ENTRANCE TO THE PROPERTY, AS OUTLINED IN ITS LETTER OF JANUARY 28, 2003 (ATTACHMENT H). THE APPLICANT SHALL BE
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RESPONSIBLE FOR THE COST OF A TRAFFIC SIGNAL AND ITS INSTALLATION (THE "SIGNAL") AT THE INTERSECTION OF ROUTE 250
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WEST AND AN ACCESS POINT SERVING THE PROPERTY APPROVED BY VDOT AND THE COUNTY'S DIRECTOR OF ENGINEERING, AS
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PROVIDED IN THIS CONDITION. UNLESS THE SIGNAL ALREADY HAS BEEN INSTALLED, THE APPLICANT SHALL PAY TO THE COUNTY
THE COST OF THE SIGNAL AS FOLLOWS:
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8A. PRIOR TO THE ISSUANCE OF A BUILDING PERMIT FOR THE FOURTH PAVILION, THE APPLICANT SHALL PLACE FUNDS IN
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ESCROW OR PROVIDE OTHER SECURITY ("SECURITY") ACCEPTABLE TO THE COUNTY IN AN AMOUNT EQUAL TO THE
COST OF THE SIGNAL (CURRENTLY ESTIMATED TO BE $140,000), WHICH AMOUNT SHALL BE CALCULATED IN THE YEAR IN
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WHICH THE SECURITY IS PROVIDED. THE SECURITY SHALL CONTINUE SO THAT IT IS AVAILABLE TO PAY
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FOR THE COST OF THE SIGNAL UNTIL TEN (10) YEARS AFTER THE DATE OF APPROVAL OF THIS SPECIAL USE PERMIT; SECURITY
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PROVIDED THAT IS NOT IN AN INTEREST -BEARING ACCOUNT SHALL BE ANNUALLY RENEWED, AND THE
AMOUNT OF THE SECURITY SHALL BE ADJUSTED EACH YEAR ACCORDING TO THE CONSUMER PRICE INDEX;
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8B. IF, AT ANY TIME UNTIL TEN (10) YEARS AFTER THE DATE OF APPROVAL OF THIS SPECIAL USE PERMIT, VDOT AUTHORIZES IN
WRITING THE INSTALLATION OF THE SIGNAL, AND VDOT AND THE COUNTY'S DIRECTOR OF ENGINEERING
APPROVE THE SIGNAL'S INSTALLATION BEFORE THE APPLICANT HAS OBTAINED A BUILDING PERMIT FOR THE FOURTH
PAVILION, THE COUNTY MAY DEMAND PAYMENT OF THE COST OF THE TRAFFIC SIGNAL, AND THE APPLICANT SHALL
PAY THE COST TO THE COUNTY WITHIN THIRTY (30) DAYS; AND
8C. THE COUNTY MAY APPLY THE APPLICANT'S SECURITY TO CONSTRUCTION OF THE ACCESS ROAD OR OTHER ELEMENTS OF THE
FUTURE TRANSPORTATION IMPROVEMENT PROJECT OTHER THAN THE TRAFFIC SIGNAL.
9. THE APPLICANT SHALL PROVIDE BICYCLE FACILITIES AND WALKWAYS IN CONJUNCTION WITH ROAD IMPROVEMENTS TO IVY
ROAD AS REQUIRED BY VDOT AND THE DEPARTMENT OF ENGINEERING AND PUBLIC WORKS IN CONJUNCTION WITH PRELIMINARY
SUBDIVISION/SITE PLAN APPROVAL.
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EXISTING CULVERT
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DROP INLET & STRUCTURE NO.
CURB
CURB & GUTTER
PROPOSED ASPHAL T
PROPOSED CONCRETE
PROPOSED PAVER (IMPERVIOUS)
BENCH MARK
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VDOT STANDARD STOP SIGN
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EXISTING CONTOUR
SHEET INDEX
TITLE SHEET
COVER
1
EXISTING CONDITIONS
2
EROSION & SEDIMENT CONTROL NARRATIVE
3
EROSION & SEDIMENT CONTROL DETAILS
4
EROSION & SEDIMENT CONTROL PLAN AND CALCULATIONS - PHASE I
5
EROSION & SEDIMENT CONTROL PLAN AND CALCULATIONS - PHASE II
6
EROSION & SEDIMENT CONTROL PLAN AND CALCULATIONS - PHASE III
7
EROSION & SEDIMENT CONTROL PLAN AND CALCULATIONS - PHASE IV
8
STORMWATER MANAGEMENT PLAN
9
STORMWATER MANAGEMENT DETAILS
10
TOTAL SHEETS
10
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LINE
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DISTANCE
L1
S27'55'55"W
39.42
L2
S19'21'00"W
43.17
L3
S23'17'13"W
104.15
L4
S69'52'46"E
22.89
L5
S58'37'51 "E
20.89
L6
S68'44'25"E
25.39
L7
S23'17'13"W
35.70
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133'31'54"
75.00
174.79
174.70
137.84
S27'15'34"E
C2
11'34'21"
320.00
64.63
32.43
64.52
S33'43'12"W
C3
8'34'55
85.00
12.73
6,38
12.72
S23'38'28"W
C4
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35.00
19.91
10.23
19.64
S03'03'12"W
C5
36'31'49"
75.00
47.82
24.75
47,01
S05'01'18"W
C6
79'08'18"
105.00
145.03
86.77
133.77
S62'51'22"W
C7
105'34'32"
17,00
31.32
22.39
27.08
S49'38'15"W
C8
26'38'14"
185.00
86.01
43.80
85.24
S16'28'08"E
C9
74'3535"
22.00
28.64
16.76
26.66
S67'05'03"E
C10
38.41'37"
215.00
145.20
75,49
142,45
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C11
35'37'43"
185.00
115.04
59.45
113.20
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22.00
34.15
21.59
30.82
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C13
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138.00
68.50
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125.00
49.98
25.33
49,64
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6.87
3.46
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215.00
262.11
150.12
246.17
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66,85
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221.00
13.28
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84.57
43.03
83.83
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T.M. 60 - 25
ROSSER ASSOCIATES ' SAN. VH. A-1
D.B. 1083-50 ao/
D.B. 635-308 PLAT
USE: OFFICE
THE CHESAPEAKE & OHIO
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D.B. 169-593, 594 PLAT
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SCOTT R. LLINS
Lic. No. 035791,E
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JOB NO.
202187
SCALE
1 "=30'
SHEET NO.
2
1992
EROSION & SEDIMENT CONTROL MEASURES:
STRUCTURAL EROSION AND SEDIMENT CONTROL PRACTICES SHALL BE IN ACCORDANCE WITH THE VIRGINIA EROSION AND SEDIMENT
CONTROL HANDBOOK. STRUCTURAL PRACTICES USED IN THIS SECTION CONSIST OF THE FOLLOWING:
3.01 SAFETY FENCE:
A PROTECTIVE 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 POTENTIAL ACCESS BY THE PUBLIC.
3.02 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.
CONSTRUCTION ENTRANCES SHALL BE INSTALLED AS SHOWN ON THE PLANS TO REDUCE THE AMOUNT SEDIMENT TRANSPORTED ONTO PUBLIC
ROAD WA YS.
J. 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 CONSTRUCTION OPERATIONS IN ORDER
TO PREVENT SEDIMENT FROM LEAVING THE SITE, AND TO DECREASE THE 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).
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.
3.08 CULVERT INLET PROTECTION:
A SEDIMENT FILTER OR AN EXCAVATED IMPOUNDING AREA AROUND A STORM CULVERT. TO PREVENT SEDIMENT FROM ENTERING STORM
CULVERTS PRIOR TO PERMANENT STABILIZATION OF THE DISTURBED AREA. INLET PROTECTION APPLIES WHERE STORM CULVERTS ARE EXISTING
OR TO BE MADE OPERATIONAL BEFORE PERMANENT STABILIZATION OF THE CORRESPONDING 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 STORMWATER RUNOFF MUST BE TEMPORARILY DIVERTED TO PROTECT DISTURBED AREAS AND SLOPES OR RETAIN SEDIMENT ON SITE
DURING CONSTRUCTION. 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 SUPPORTING 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 THE 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.
3.13 TEMPORARY SEDIMENT TRAP:
A TEMPORARY PONDING AREA FORMED BY CONSTRUCTING 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 THAN
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 CONSTRUCTING 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
CONSTRUCTION OF A TEMPORARY IMPOUNDMENT.
3.18 OUTLET PROTECTION:
STRUCTURALL Y LINED APRONS OR OTHER ACCEPTABLE ENERGY D/SS/PA TING DEVICES PLACED A T THE OUTLETS OF PIPES OR PA VED CHANNEL
SECTIONS. TO PREVENT SCOUR AT STORMWATER OUTLETS, TO PROTECT THE OUTLET STRUCTURE, AND TO MINIMIZE THE POTENTIAL FOR
DOWNSTREAM EROSION BY REDUCING THE VELOCITY AND ENERGY OF CONCENTRATED STORMWATER FLOWS. APPLICABLE TO THE OUTLETS OF
ALL PIPES AND ENGINEERED CHANNEL SECTIONS.
3.19 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 PRACTICE ALSO TRAPS SEDIMENT GENERATED FROM
ADJACENT AREAS OR THE DITCH ITSELF, MAINLY BY PONDING OF THE STORMWATER RUNOFF. THIS PRACTICE, UTILIZING 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 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.
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 CONDITIONS, AND ALLOWS SELECTION OF THE MOST APPROPRIATE PLANT MATERIALS. TO IMPROVE WILDLIFE HABITAT. TO ENHANCE
NATURAL BEAUTY. UPON COMPLETION OF CONSTRUCTION ACTIVITIES, ALL AREAS WILL RECEIVE A PERMANENT VEGETATIVE COVER.
3.35 MULCHING:
APPLICATION OF PLANT RESIDUES OR OTHER SUITABLE MATERIALS TO THE SOIL SURFACE. TO PREVENT EROSION BY PROTECTING 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 INSULATION 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 PLANTINGS OF TREES, SHRUBS, OR CERTAIN GROUND COVERS WHICH DO NOT
PROVIDE ADEQUATE SOIL STABILIZATION BY THEMSELVES, CAN BE USED IN CONJUNCTION WITH TEMPORARY SEEDING.
3.37 TREES, SHRUBS. VINES & GROUND COVERS:
STABILIZING DISTURBED AREAS BY ESTABLISHING VEGETATIVE COVER WITH TREES, 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 IS
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.
3.36 BLANKET MA TTING:
INSTALLATION OF A PROTECTIVE COVERING OR A SOIL STABILIZATION MAT ON A PREPARED PLANTING AREA OF A STEEP SLOPE OR CHANNEL TO
AID IN THE CONTROLLING EROSION ON CRITICAL AREAS.
3.38 TREE PRESERVATION AND PROTECTION:
PROTECTION OF DESIRABLE TREES FROM MECHANICAL OR OTHER INJURY DURING LAND DISTURBING AND CONSTRUCTION ACTIVITY. 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 CONSTRUCTION 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 CONTROL MEASURES SHALL BE EMPLOYED TO
PREVENT SURFACE AND AIR MOVEMENT OF DUST DURING CONSTRUCTION. MEASURES EMPLOYED SHALL BE IN ACCORDANCE WITH THE VESCH.
3.32
TABLE 3.32-D
SITE SPECIFIC SEEDING MIXTURES FOR PIEDMONT AREA
Minimum Care Lawn
Total Lbs.
Per Acre
- Commercial or Residential
175-200 lbs.
- Kentucky 31 or Turf -Type Tall Fescue
95-100°Io
- Improved Perennial Ryegrass
0-5%o
- Kentucky Bluegrass
0-5%
High -Maintenance Lawn
200-250 lbs.
- Kentucky 31 or Turf -Type Tall Fescue
100%
General Slope (3:1 or less)
- Kentucky 31 Fescue
M lbs.
- Red Top Grass
2 lbs.
- Seasonal Nurse Crop .
20 lbs.
150 lbs.
Law -Maintenance Slope (Steeper1han 11)
- Kentucky 31 Fescue
108 lbs.
- Red Top Grass
2 lbs.
- Seasonal Nurse Crop .
20 lbs.
- Crownvetch * *
20 lbs.
150 tbs
. Use seasonal nurse crop in accordance with seeding dates as stated below:
February 16th through April Annual Rye
May 1st through August 15th ..................... Foxtail Millet
August 16th through October . . . . . ................. Annual Rye
November through February 15th ................... Winter Rye
" Substitute Sericea lespedeza for Crownvetch east of Farmville, Va. (May
through September use hulled Sericea, all other periods, use unhulled Sericea).
If Flatpea is used in lieu of Crownvetch, increase rate to 30 Ibs./acre. All legume
seed must be properly inoculated. Weeping Lovegrass may be added to any slope
or low -maintenance mix during warmer seeding periods; add 10-20 lbs./acre in
mixes.
TARLE 3.31-A
LIMING REQUIREMENTS
FOR TEMPORARY SITES
Recommended Application
uH Test of Agricultural Limestone
below 4-2 3 tons per acre
4.2 to 5.2 2 tons per acre
5.2 to 6 1 ton per acre
TABLE 3.31-B
ACCEPTABLE TEMPORARY SEEDING PLANT MATERIALS
-QUICK REFERENCE FOR ALL REGIONS"
Rate
Planting Dates Species lbs. acre
Sept. 1 - Feb. 15 50/50 Mix of
Annual Ryegrass
(Lolium multi-florum)
& 50 - 100
Cereal (Winter) Rye
(Secale cereale)
Feb. 16 - Apr. 30 Annual Ryegrass 60 - 100
(Lolium multi-flormn
May 1 - Aug 31
German Millet So
(Setaria italics)
GENERAL SLOPE (3:1 OR LESS)
TOTAL LBS PER ACRE
KENTUCKY 31 FESCUE
128 LBS
RED TOP GRASS
2 LBS
SEASONAL NURSE CROP
20 LBS
150 LBS
sEAsoNAL NURSE CROP
FEBRUARY 16 THROUGH APRIL
ANNUAL RYE
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 COMPLET OH
OF SEED APPLICATION, IN ACCORDANCE W/ VESCH STD 3.35.
PERMANENT SEEDING SCHEDULE PS
NO SCALE
(STD. & SPEC. 3.32 OF VIRGINIA EROSION &
SEDIMENT CONTROL HANDBOOK, 3RD ED.)
EROSION CONTROL NOTES
ES-1: UNLESS OTHERWISE INDICATED, ALL VEGETA TI VE 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-J.-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 SI TE A T 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 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 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.
ES-8. DURING DEWA TERING OPERATIONS, 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 EFFECTIVENESS OF THE
EROSION CONTROL DEVICES SHALL BE MADE IMMEDIATELY.
General construction notes for Erosion and Sediment Control plans
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 Iand 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.
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 Code 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 any hazard to persons, physical damage to adjacent land and
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
stormwater management facilities where applicable all erosion control measures required
by this plan regardless of the sale of any lot, unit, building or other portion of the property.
17. Temporary stabilization shall be temporary seeding and mulching. Seeding is to be at 75
lbs/acre, and in the months of September to February to consist a 50150 mix of Annual
Ryegrass and Cereal Winter Rye, or in March and April to consist of Annual Rye, or May
through August to consist of German Millet- Straw mulch 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 top 4-6
inches of soil. Fertilizer shall be applied at 1000lbs/acre and consist of a 10-20-10 nutrient
mix. Permanent seedingshall be applied at 180lbs/acre and consist of 5% Kentucky 31 or
pp 9 Y
Tall Fescue and 0-5% Perennial Ryegrass or Kentucky Bluegrass. Straw mulch is to be
applied at 80lbs/100sf. Alternatives are subject to approved b the Count erosion control
pP J pp Y Y
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 by the
County erosion control inspector.
21. This plan shall be void if the owner does not obtain a permit within 1 year of the date of
approval. (Water Protection Ordinance section 17-204G.)
22. Permanent vegetation shall be installed on all denuded areas within nine (9) months after
the date the land disturbing activity commenced. (Water Protection Ordinance section 17-
20713)
TEMPORARY SEEDING.•
ALL DENUDED AREAS WHICH WILL BE LEFT DORMANT FOR EXTENDED PERIODS OF TIME SHALL BE SEEDED WITH FAST GERMINATING
TEMPORARY VEGETATION IMMEDIATELY FOLLOWING GRADING. SELECTION OF THE SEED MIXTURE WILL DEPEND ON THE TIME 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 3.31E AND 3.31C. NOTE THAT
TABLE 3.31E PRESENTS PLANTS WHICH CAN BE USED WITHOUT EXTENSIVE EVALUATION OF SITE CONDITIONS; TABLE 3.31C
PRESENTS MORE IN-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 3.31A MAY BE
USED TO DETERMINE THE ACTUAL NEED ALONG WITH 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
FERTILIZER 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
COMPACTION 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, CULTIPACKER SEEDER OR HYDROSEEDER. SMALL GRAINS
SHALL BE PLANTED NO MORE THAN 11 INCHES DEEP. SMALL SEEDS, SUCH AS KENTUCKY BLUEGRASS, SHOULD BE PLANTED NO
MORE THAN j INCH DEEP. OTHER GRASSES AND LEGUMES SHOULD BE PLANTED FROM j INCH TO I 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.
DESCRIPTION OF EROSION & SEDIMENT
EROSION CONTROL NOTES & NARRATIVE
CONTROL MEASURES:
THEPPURPOSE
OF THIS LAND DISTURBING ACTIVITY IS TO GRADE THE SPRING HILL VILLAGE SITE FOR FUTURE DEVELOPMENT.
EROSION AND SEDIMENT CONTROL MEASURES:
THE TOTAL AREA TO BE DISTURBED WITH THIS PHASE OF DEVELOPMENT IS 1.98 ACRES.
IT IS ANTICIPATED TO USE CONSTRUCTION ENTRANCES, DIVERSION DIKES, EXISTING SEDIMENT BASINS, AND SILT FENCES
EXISTING SITE CONDITIONS:
WILL BE INSTALLED TO CONTROL SURFACE DRAINAGE. TEMPORARY SEEDING WILL BE USED IMMEDIATELY FOLLOWING ALL
PART OF THIS SITE HAS A WOODS GRASS COMBINATION AND SLOPES TO THE SOUTH-WEST. THE SITE IS LOCATED TO THE
LAND DISTURBANCE ACTIVITIES. TEMPORARY STOCKPILE AREAS WILL BE MAINTAINED FROM TOPSOIL THAT WILL BE
NORTH OF IVY ROAD (RTE 250). THE MAJORITY OF THE SITE DRAINS NORTH-EAST OF THE PROPERTY.
STRIPPED FROM AREAS TO BE GRADED AND STORED FOR LATER SPREADING. STOCKPILE LOCATIONS SHALL BE ON SITE
ADJACENT AREAS:
AND SHALL BE STABILIZED WITH A TEMPORARY VEGETATIVE COVER. PERMANENT SEEDING WILL BE PERFORMED FOR ALL
THIS SITE IS BORDERED TO THE EAST BY AN EXISTING OFFICE BUILDING AND TO THE WEST BY EXISTING WHITE GABLES
AREAS WHICH WILL NO LONGER BE EXCAVATED AND WHERE CONSTRUCTION ACTIVITIES HAVE CEASED. PERMANENT
CONDOMINIUMS. THE CHESAPEAKE AND OHIO RAILROAD IS JUST NORTH OF THE SITE AND IVY ROAD (RTE 250) TO THE SOUTH
SEEDING SHALL ALSO BE PERFORMED FOR ALL DENUDED AREAS WHICH WILL BE LEFT DORMANT FOR A YEAR OR MORE.
OF THE SITE.
OFFSITE LAND DISTURBANCE:
SELECTION OF SEED MIXTURE WILL DEPEND ON THE TIME OF YEAR APPLIED.
IMPROVEMENTS TO BE MADE ON PRIVATE WHITE GABLES LANE INCLUDE REPAVING AND TWO (2) PARKING BAYS.
TEMPORARY SEEDING WILL BE PERFORMED FOR ALL DENUDED AREAS WHICH WILL BE LEFT DORMANT FOR MORE THAN
CRITICAL AREAS:
SEVEN DAYS. THESE AREAS SHALL BE SEEDED WITH FAST GERMINATING VEGETATION IMMEDIATELY FOLLOWING GRADING
TREE PROTECTION FENCING AND SILT FENCE SHALL BE MAINTAINED ALONG THE PROPERTY LINES TO THE EAST, NORTH, AND
OF THOSE AREAS. SELECTION OF SEED MIXTURE WILL DEPEND ON THE TIME OF YEAR APPLIED.
SOUTH OF THE SITE TO PROTECT THE ADJACENT PROPERTIES AND ONSITE TREES.
CONSTRUCTION ENTRANCE:
SOILS:
A STABILIZED PAVED CONSTRUCTION ENTRANCE WITH A WASH RACK LOCATED AT POINTS OF VEHICULAR INGRESS AND
SOILS MAP IS INCORPORATED INTO EROSION CONTROL PLAN PHASE I WITH SOILS DATA INCLUDED WITH THIS NARRATIVE.
EGRESS ON A CONSTRUCTION SITE. TO REDUCE THE AMOUNT OF MUD TRANSPORTED ONTO PAVED PUBLIC ROADS BY
SEQUENCE OF CONSTRUCTION:
MOTOR VEHICLES OR RUNOFF.
PHASE I (BUILDING PAVILION II):
CONSTRUCTION ENTRANCES SHALL BE INSTALLED AS SHOWN ON THE PLANS TO REDUCE THE AMOUNT SEDIMENT
1. NOTIFY ALBEMARLE COUNTY TO SCHEDULE A PRE -CONSTRUCTION MEETING AS REQUIRED.
TRANSPORTED ONTO PUBLIC ROADWAYS.
2. PRIOR TO DISTURBANCES, THE LIMITS OF DISTURBANCE SHALL BE FLAGGED AND THE TREE PROTECTION FENCING SHALL BE
SILT FENCE:
INSTALLED.
3. NO EROSION CONTROL MEASURES MAY BE REMOVED DURING THE CONSTRUCTION PROCESS WITHOUT THE APPROVAL FROM
A TEMPORARY SEDIMENT BARRIER CONSISTING OF A SYNTHETIC FILTER FABRIC STRETCHED ACROSS AND ATTACHED TO
THE INSPECTOR ON THE PROJECT.
SUPPORTING POSTS AND ENTRENCHED. TO INTERCEPT AND DETAIN SMALL AMOUNTS OF SEDIMENT FROM DISTURBED
4. THE PROPOSED CONSTRUCTION ENTRANCE WITH WASH AREAS SHALL BE INSTALLED AS SHOWN ON THE PLANS. THE
AREAS DURING CONSTRUCTION OPERATIONS IN ORDER TO PREVENT SEDIMENT FROM LEAVING THE SITE. TO DECREASE
CONSTRUCTION ENTRANCE TO BE INSTALLED WHERE CONSTRUCTION VEHICLE ROUTES INTERSECT PAVED PUBLIC ROADS,
THE VELOCITY OF SHEET FLOWS AND LOW -TO -MODERATE LEVEL CHANNEL FLOWS. THE SILT FENCE BARRIERS SHALL BE
PROVISIONS SHALL BE MADE TO MINIMIZE THE TRANSPORT OF SEDIMENT BY (VEHICULAR) TRACKING ONTO THE PAVED
INSTALLED DOWN SLOPE OF AREAS WITH MINIMAL GRADES TO FILTER SEDIMENT LADEN RUNOFF FROM SHEET FLOW AS
SURFACE. WHERE SEDIMENT IS TRANSPORTED ONTO A PUBLIC ROAD SURFACE, THE ROAD SHALL BE CLEANED
INDICATED. THEY SHALL BE INSPECTED IMMEDIATELY AFTER EACH RAINFALL AND MAINTAINED IN ACCORDANCE WITH THE
THOROUGHLY AT THE END OF EACH DAY. SEDIMENT SHALL BE REMOVED FROM THE ROADS BY SHOVELING OR SWEEPING
VIRGINIA EROSION & SEDIMENT CONTROL HANDBOOK (VESCH).
AND TRANSPORTING TO A SEDIMENT CONTROL DISPOSAL AREA. STREET WASHING SHALL BE ALLOWED ONLY AFTER
PERMANENT STABILIZATION:
SEDIMENT IS REMOVED IN THIS MANNER.
THE ESTABLISHMENT OF PERENNIAL VEGETATIVE COVER ON DISTURBED AREAS BY PLANTING SEED. TO REDUCE EROSION
5. INSTALL THE INITIAL CONSTRUCTION MEASURES AS SHOWN ON THE PHASE I EROSION CONTROL SHEET. THIS INCLUDES (3)
AND DECREASE SEDIMENT YIELD FROM DISTURBED AREAS. TO PERMANENTLY STABILIZE DISTURBED AREAS IN A MANNER
SEDIMENT TRAPS, WIRE SILT FENCE, AND DIVERSION DIKES. MEASURES INTENDED TO TRAP SEDIMENT SHALL BE
THAT IS ECONOMICAL, ADAPTABLE TO SITE CONDITIONS, AND ALLOWS SELECTION OF THE MOST APPROPRIATE PLANT
CONSTRUCTED AS A FIRST STEP WITH ANY LAND DISTURBANCE ACTIVITY AND SHALL BE MADE FUNCTIONAL BEFORE
UPSLOPE LAND DISTURBANCE TAKES PLACE.
MATERIALS. TO IMPROVE WILDLIFE HABITAT. TO ENHANCE NATURAL BEAUTY. UPON COMPLETION OF CONSTRUCTION
6. ONCE ALL THE PHASE I EROSION CONTROL ITEMS HAVE BEEN INSTALLED AS SHOWN ON THE EROSION CONTROL PHASE I
ACTIVITIES, ALL AREAS WILL RECEIVE A PERMANENT VEGETATIVE COVER.
PLAN AND THE INSPECTOR HAS APPROVED THE EROSION CONTROL MEASURES, THE CONTRACTOR CAN BEGIN THE MINIMUM
TEMPORARY SEEDING:
GRADING OPERATIONS. STABILIZATION MEASURES SHALL BE APPLIED TO EARTHEN STRUCTURES SUCH AS DAMS, DIKES,
THE ESTABLISHMENT OF A TEMPORARY VEGETATIVE COVER ON DISTURBED AREAS BY SEEDING WITH APPROPRIATE
AND DIVERSIONS IMMEDIATELY AFTER INSTALLATION.
RAPIDLY GROWING ANNUAL PLANTS. TO REDUCE EROSION AND SEDIMENTATION BY STABILIZING DISTURBED AREAS THAT
7. PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN SEVEN DAYS AFTER FINAL
WILL NOT BE BROUGHT TO FINAL GRADE FOR A PERIOD OF MORE THAN 30 DAYS. TO REDUCE DAMAGE FROM SEDIMENT
GRADE IS REACHED ON ANY PORTION OF THE SITE. TEMPORARY SOIL STABILIZATION SHALL BE APPLIED WITHIN SEVEN
AND RUNOFF TO DOWNSTREAM OR OFF -SITE AREAS, AND TO PROVIDE PROTECTION TO BARE SOILS EXPOSED DURING
DAYS TO DENUDED AREAS THAT MAY NOT BE AT FINAL GRADE BUT WILL REMAIN DORMANT (UNDISTURBED) FOR LONGER
CONSTRUCTION UNTIL PERMANENT VEGETATION OR OTHER EROSION CONTROL MEASURES CAN BE ESTABLISHED.
THAN 30 DAYS. PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR MORE
DUST CONTROL:
THAN ONE YEAR.
REDUCING SURFACE AND AIR MOVEMENT OF DUST DURING LAND DISTURBING, DEMOLITION AND CONSTRUCTION ACTIVITIES.
TO PREVENT SURFACE AND AIR MOVEMENT OF DUST FROM EXPOSED SOIL SURFACES AND REDUCE THE PRESENCE OF
SUBSTANCES PRESENT TRAFFIC SAFETY PROBLEMS OR OR PLANT
PHASE II (BUILDING PAVILION IV):
AIRBORNE WHICH MAY HEALTH HAZARDS, HARM ANIMAL
8. AS THE FIRST PART OF PHASE II, THE CONTRACTOR SHALL ENSURE THAT ANY DRAINAGE INLETS INSTALLED IN THE
LIFE.
PREVIOUS PHASE SHALL HAVE APPROPRIATE INLET PROTECTION AS SHOWN ON THE PLAN BEFORE BEGINNING TO BUILD
DUST CONTROL MEASURES SHALL BE EMPLOYED TO PREVENT SURFACE AND AIR MOVEMENT OF DUST DURING
PAVILION IV. DRAINAGE STRUCTURES SHALL OUTFALL INTO SEDIMENT TRAP #3 UNTIL THE SITE IS STABILIZED.
CONSTRUCTION. MEASURES EMPLOYED SHALL BE IN ACCORDANCE WITH THE VESCH.
9. PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN SEVEN DAYS AFTER FINAL
TEMPORARY DIVERSION DIKE:
GRADE IS REACHED ON ANY PORTION OF THE SITE. TEMPORARY SOIL STABILIZATION SHALL BE APPLIED WITHIN SEVEN
A RIDGE OF COMPACTED SOIL CONSTRUCTED AT THE TOP OR BASE OF A SLOPING DISTURBED AREA WHICH DIVERTS
DAYS TO DENUDED AREAS THAT MAY NOT BE AT FINAL GRADE BUT WILL REMAIN DORMANT (UNDISTURBED) FOR LONGER
OFF -SITE RUNOFF AWAY FROM UNPROTECTED SLOPES AND TO A STABILIZED OUTLET, OR TO DIVERT SEDIMENT -LADEN
THAN 30 DAYS. PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR MORE
RUNOFF TO A SEDIMENT TRAPPING STRUCTURE. MAXIMUM EFFECTIVE LIVE IS 18 MONTHS.
THAN ONE YEAR.
ROCK CHECK DAMS:
SMALL, TEMPORARY STONE DAMS CONSTRUCTED ACROSS A DRAINAGE DITCH TO REDUCE THE VELOCITY OF
PHASE III (BUILDING OF PAVILION VI):
CONCENTRATED FLOWS, REDUCING EROSION OF THE SWALE OR DITCH. LIMITED TO USE IN SMALL OPEN CHANNELS WHICH
10. AS THE FIRST PART OF PHASE III, THE CONTRACTOR SHALL ENSURE THAT ANY DRAINAGE INLETS INSTALLED IN THE
DRAIN 10 ACRES OR LESS; SHOULD NOT BE USED IN LIVE STREAMS.
PREVIOUS PHASE SHALL HAVE APPROPRIATE INLET PROTECTION AS SHOWN ON THE PLAN BEFORE BEGINNING TO BUILD
STORM DRAIN INLET PROTECTION:
PAVILION VI. DRAINAGE STRUCTURES SHALL OUTFALL INTO SEDIMENT TRAP #3 UNTIL THE SITE IS STABILIZED.
11. PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN SEVEN DAYS AFTER FINAL
THE INSTALLATION OF VARIOUS KINDS OF SEDIMENT TRAPPING MEASURES AROUND DROP INLETS OR CURB INLET
GRADE IS REACHED ON ANY PORTION OF THE SITE. TEMPORARY SOIL STABILIZATION SHALL BE APPLIED WITHIN SEVEN
STRUCTURES PRIOR TO PERMANENT STABILIZATION OF THE DISTURBED AREA; LIMITED TO DRAINAGE AREAS NOT
DAYS TO DENUDED AREAS THAT MAY NOT BE AT FINAL GRADE BUT WILL REMAIN DORMANT (UNDISTURBED) FOR LONGER
EXCEEDING ONE ACRE, AND NOT INTENDED TO CONTROL LARGE, CONCENTRATED STORMWATER FLOWS.
THAN 30 DAYS. PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR MORE
TEMPORARY SEDIMENT TRAP:
THAN ONE YEAR.
A SMALL PONDING AREA, FORMED BY CONSTRUCTING AN EARTHEN EMBANKMENT WITH A STONE OUTLET ACROSS A
DRAINAGE SWALE, TO DETAIN SEDIMENT -LADEN RUNOFF FROM SMALL DISTURBED AREAS FOR ENOUGH TIME TO ALLOW
PHASE IV:
MOST TO THE SUSPENDED SOLIDS TO SETTLE OUT. MAXIMUM EFFECTIVE LIFE IS 18 MONTHS.
12.ONCE THE SITE IS STABILIZED AND THE INSPECTOR HAS GIVEN APPROVAL, THE CONTRACTOR CAN REMOVE THE SEDIMENT
TEMPORARY SEDIMENT BASIN:
TRAPS. NO ITEM SHALL BE REMOVED UNLESS THE UPSTREAM AREAS ARE STABILIZED AND THE INSPECTOR GIVES
A TEMPORARY BARRIER OR DAM WITH CONTROLLED STORMWATER RELEASE STRUCTURES WHICH IS FORMED BY
PERMISSION.
CONSTRUCTING AN EMBANKMENT OF COMPACTED SOIL ACROSS A DRAINAGEWAY. IT IS USED TO DETAIN
11MAINTAIN 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
SEDIMENT -LADEN RUNOFF FROM DRAINAGE AREAS 3 ACRES OR GREATER FOR ENOUGH TIME TO ALLOW MOST OF THE
AND SEDIMENT CONTROL HANDBOOK.
SUSPENDED SOLIDS TO SETTLE OUT. IT CAN BE CONSTRUCTED ONLY WHERE THERE IS SUFFICIENT SPACE AND
14. ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES SHALL BE REMOVED WITHIN 30 DAYS AFTER FINAL SITE
APPROPRIATE TOPOGRAPHY MAXIMUM EFFECTIVE LIFE IS 18 MONTHS UNLESS DESIGNED AS A PERMANENT POND BY A
STABILIZATION OR AFTER THE TEMPORARY MEASURES ARE NO LONGER NEEDED UNLESS OTHERWISE AUTHORIZED BY THE
QUALIFIED PROFESSIONAL.
LOCAL PROGRAM ADMINISTRATOR. TRAPPED SEDIMENT AND THE DISTURBED SOIL AREAS RESULTING FROM THE DISPOSITION
OUTLET PROTECTION:
OF TEMPORARY MEASURES SHALL BE PERMANENTLY STABILIZED TO PREVENT FURTHER EROSION AND SEDIMENTATION.
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 CONTROL AT CULVERTS
SOIL DESCRIPTION
DURING THE PHASE OF A PROJECT WHERE ELEVATIONS AND DRAINAGE PATTERNS ARE CHANGING, CAUSING ORIGINAL
19B
CONTROL MEASURES TO BE INEFFECTIVE.
-MINNIEVILLE LOAM-2% TO 7% SLOPES. THESE DEEP, WELL DRAINED SOILS ARE FOUND ON GENTLY SLOPING TO STEEP
HILLSLOPES. MODERATE RUNOFF, WITH MODERATE PERMEABILITY.
SAFETY FENCE:
A PROTECTIVE 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 NARRATIVE.
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, 37.5 LBS/ACRE ARGILS KENTUCKY BLUEGRASS, 37.5 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 DEPOSITION 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.
36C -HAYESVILLE LOAM-7% TO 15% SLOPES. THESE DEEP, WELL DRAINED SOILS ARE FOUND ON GENTLY SLOPING TO
STEEP RIDGES AND MOUNTAIN SLOPES. MODERATE RUNOFF, WITH MODERATE PERMEABILITY.
STORM WA TER RUN-OFF CONSIDERATIONS.•
STORMWATER MANAGEMENT.• THE STORMWATER RUNOFF FROM THIS PROJECT DRAINS TEMPORARILY TO
THE TRAPS. THE SEDIMENT TRAPS WILL BE REMOVED AFTER THE DEVELOPMENT OF THE WHITE GABLES
PROJECT
OPTI F I PROTTCTIOPI SIZING
TYPE
LENGTH
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VDOT CLASS 1 A
18'
3'
1.5'
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4'
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VDOT CLASS 1 A
9'
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92 3.01 1992 3.05 1992 3.05 1992 3.07
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STONE COHSTRUCMN 76' MIN. C
SAFETY FENCE ASS 3- SIA-2AwALr ><aP CONSTRUCTION OF A SILT FENCE CONSTRUCTION OF A SILT FENCE' 9/16/20
2x EXISTING GRAVEL CURB INLET SEDIMENT
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p rY" M•N 2'A AQQRR iGAEE MSE TRENCH UPSLOPE ALONG THE LINE UPSLOPE ALONG THE LINE OF
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(U) PO5 5
THIS METHOD OF INLET PROTECTION IS APPLICABLE AT CURB INLETS
Y , 41 i'li I l' CD
FILTER FABRIC / i { fr S I, J ; j w cal
PERSPECTIVE VIEW PERSPECTIVE VIEW /���\ J' _ _ \� � WHERE PONDING IN FRONT OF THE STRUCTURE IS NOT LIKELY TO CAUSE � �
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AREAS. a,
WIRE 1� POINTS A SHOULD BE HIGHER THAN POINT B.
1LLLI-J DRAINAGEWAY INSTALLATION GRAVEL SHALL BE VDOT #3, #357 OR 5 COARSE AGGREGATE.
Source: Adapted from Conwed Plastics and Plate 3.01-1� I - (FRONT ELEVATION)
VDOT Road and Bridge Standards
Source: Adapted from Installation of Straw and Fabric Filter Source: Adapted from Installation of Straw and Fabric Filter
Barriers for Sediment Control, Sherwood and Wyant Plate 3.05-1 Barriers for Sediment Control, Sherwood and Wyant Plate 3.05-2 Source: Va. DSWC Plate 3.07-6 z
rn
1992 3.11 1992 3.18 i ti
1992 3.07 1992 3.36 1992 3.38 M
cri
SILT FENCE DROP INLET TEMPORARY RIGHT-OF-WAY PIPE OUTLET CONDITIONS TYPICAL ORIENTATION OF FENCING AND ARMORING CN
m �
PROTECTION DIVERSIONS A A TREATMENT - 1 4
2 X 4' WOOD FRAME DROP INLET (iJ ®IlJ S TABILIZA TION DLANI�E T)
WITH GRATE VDOT # 1 T" - ,, ,,,= � I
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J AREA WITH NO DEFINED - NETTING PROTECTIVE COVERINGS DRIP LINE I I N J
MAY BE APPLIED ACROSS w
CHANNEL THE SLOPE.
a' MIN, � � � � � PLAN VIEW =''" Q I --I
SNOW FENCE C L a W
EXCESS 6, MINIMUGATHERM - BERM I I J z 0
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PERSPECTIVE VIEWS � ' , I W
TYPICAL GRAVEL STRUCTURE SECTION A -A FILTER CLOTH KEY IN 6"-9"; RECOMMENDED FOR ENTIRE PERIMETER STEEP I Uj Q
SLOPE
STAKE
A ON STEEP SLOPES, APPLY BOARD FENCE I O z / �
_ PROTECTIVE COVERING PARALLEL CORD FENCE J `•J
FABRIC 3d MIN. i<.I �. I ANDTO THE
ANCHIORCTION OF SECURELY.FLOW n/
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III V MIN. d0 -I T I -u ' CORRECT METHODS OF TREE FENCING U
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DEFINED CHANNEL
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_ PLAN VIEW � BRING MATERIAL DOWN TO A LEVEL AREA BEFORE •;� f � yy / + �
ELEVATION OF STAKE AND v f� �-� UN TERMINATING
AND STAPLE THE TALLAT ON INTERVALSTURN THE
ENDDER
127
FABRIC ORIENTATION DETAIL A _ L a `'':' z•,' , , 12.1 06
DITCH FLOW V) O 0
SPECIFIC APPLICATION g' MINIMUM d IN DITCHES, APPLY PROTECTIVE COVERING / ` ■
SECTION A -A PARALLEL TO THE DIRECTION OF FLOW- W O
THIS METHOD OF INLET PROTECTION IS APPLICABLE WHERE THE USE CHECK SLOTS AS REQUIRED. AVOID
INLET DRAINS A RELATIVELY FLAT AREA (SLOPE NO GREATER FILTER CLOTH KEY IN 6"-Y'; RECOMMENDED FOR ENTIRE PERIMETER THE JOINING
DITMATERIAL
ALL HE CE�R OF + !/ y 1 Uj
THAN 5%) WHERE THE INLET SHEET OR OVERLAND FLOWS (NOT NOTES: 1. APRON LINING MAY BE RIPRAP, GROUTED RIPRAP, GABION _ - rp lZ LWL
EXCEEDING 1 C.F.S.) ARE TYPICAL. THE METHOD SHALL NOT BASKET, OR CONCRETE. - ,arglloME
TYPICAL EARTHEN STRUCTURE 2. La IS THE LENGTH OF THE RIPRAP APRON AS CALCULATED I CORRECT TRUNK ARMORING
APPLY TO INLETS RECEIVING CONCENTRATED FLOWS, SUCH AS USING PLATES 3.16-3 AND 3.16-4. I_ I I II r"qM
IN STREET OR HIGHWAY MEDIANS. 3. d = 1.5 TIMES THE MAXIMUM STONE DIAMETER, BUT NOT to
LESS THAN 6 INCHES. TRIANGULAR BOARD FENCE w
-
LILI
Source: N.C. Erosion and Sediment Control Source: Va. DSWC Plate 3.11-1 Source: Va. DSWC Plate 3.18-1 � W
Planning and Design Manual, 1988 Plate 3.07-1 Source: Adapted from Ludlow Products Brochure Plate 3.36-1 Source: Va. DSWC Plate 3.38-2
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E-511111 i milli I 110111111 _ _ AS NOTED
4.5' min. SHEET NO.
I 4
VIROINIA
EROSION SEDIMENT
EROSION CONTROL * y NDBOOK SCONTROL
SPECIFICATION NUMBER
SA SAFETY FENCE 3.01
O
- I
CE CONSTRUCTION ENTRANCE J. -----
SOIL I
0 1 -
-J
-- ! -
CR CRS CONSTRUCTION ROAD STABILIZATION 3.03 TYPE I ',
SF SILT FENCE 3.05 19 B
0 -
r-I
I I
II
lP STORM DRAIN INLET PROTECTION 3.07
DD TEMPORARY DIVERSION DIKE 3.09 �
L
RW TEMPORARY ROW DIVERSION 3.11
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ST � SEDIMENT TRAP 3.13 \ II
a
SB SEDIMENT BASIN 3.14
OUTLET PROTECTION 3.18
RR RIPRAP 3.19
CD �� UTILITY STREAM CROSING 3.25 - - - - - - - - -
TS TS TEMPORARY SEEDING 3.31
PS PS PERMANENT SEEDING 3.32
TREE PROTECTION 3.38 NOTE: SILT FENCE, SAFETY FENCE, AND /
TREE PROTECTION SHALL BE INSTALLED SOIL TYPE BOUNDARY (TYP.)
DC DC DUST CONTROL 3.39 AT LIMITS OF DISTURBANCE. THESE ARE
OFFSET FOR GRAPHICAL PURPOSES.
BM SOIL STABILIZATION BLANKET 3.36 DRAINAGE DIVIDES ARE MEASURED AT THE
- \ LIMITS OF DISTURBANCE OR DIVERSION
°
k
CONTRACTOR STAGING AREA
WITH FUELING TANK, DUMPSTER,
\ AND PORTA-POTTIES
l \ �
PROPOSED SAFETY
FENCE AROUND
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OTE: THIS CONSTRUCTION ENTRANCE SHALL BE
STALLED, OPERATED, AND MAINTAINED BY THE
ONTRACTOR. ALL CONSTRUCTION TRAFFIC IN THIS
REA SHALL UTILIZE THIS CONSTRUCTION ENTRANCE.
Sediment Trap design #1
drainage area (acres) (< 2 ac)
0.58
trap volumes:
elevation (ft) area (sf) volume(cf)
volume(cy)
587.00 256.0
0
0.0
588.00 756.0
484
17.9
589.00 1018.0
1,368
50.7
590.00 1309.0
2,528
93.6
0 0
0
0.0
wet storage:
wet storage required (cy) (67*DA)
bottom of stone weir (ft)
wet storage provided at this elevation (cy)
slope of wet storage sides
dry storage:
dry storage required (cy) (67*DA)
crest of stone weir
dry storage provided at this elevation (cy)
slope of dry storage sides
38.9
588.64
38.9
ORIGNAL
GROUND
ELEV.
-SEE PLATE 3.13-1
= 0
1' VARIABLE
CREST OF STONE WEIR I _ VARIABLE*-
�� l i -
DRY STORAGE
�1
:1�L♦i
WET STORAGE 1 1
c MAX.
(EXCAVATED)
1 FILTER CLOTH ORIGINAL
GROUND
ELEV.
COARSE AGGREGATECLASS I RIPRAP
weir length (ft) (6xDA)
bottom of trap elevation (ft)
38.9 bottom trap dimensions:
589.63 top of dam elevation (ft)
38.9 top width of dam (ft)
2:1 top trap dimensions
3.5
587.00
13'X40'
590.63
6'
25'x53'
+++I++ /
DA TO ST 2 = o.So AC / - ' ' i ++ +I+ +I I/ /
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' ' ' _ $'TOP - % PROPOSED SAFETY FENCE
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X % % -t L� -�i� � OF DAM
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TP PROPOSED SAFETY FENCE ---� /
AROUND SEDIMENT TRAP TP - - SAF
LIMITS OF DISTURBANCE (TYP.) Lx xxX X _
X X-x
x4x x-
X-x�
ROSSER ASSOCIATES
EEICF TP
Sediment Trap design #2 Sediment Trap design #3
drainage area (acres) (< 2 ac) 0.5 ,' VARIABLEdrainage area (acres) (< 2 ac) 0.65
1' VARIABLE
trap volumes: }� fl CREST OF STONE WEIR VARIABLE' trapvolumes:
( ) ( '1 ( '/volume(cy) O�µ� \ ( ) ( ( fl ( y) CREST OF STONE WEIR
elevation ftareas volume c GROUND y elevation ft areas volume c') volume c ORIGINAL /ARIABLE�
GROUND
599 229 O 0.0 ELEV. - -
585 426 0 0.0
600 739 460 17.0 DRY STORAGE - N VARIABLE' 586 836 620 22.9 DRY STORAGE N VARIABLE+
601 1341 1,485 55.0 587 1335 1,695 62.8
602 1967 3,129 115.9 588 1897 3,303 122.3
0 0 0 0.0 WET STORAGE V Max 589 2518 5,503 203.8 WET STORAGE 4• Mk
(EXCAVATED)
,FILTER CLOTH ORIGINAL (EXCAVATED)
1 FILTER CLOTH ORIGINAL
GROUND
EGROUND
ELEV.
ELEV.
wet storage: wet storage:
-SEE PLATE 3.13-1 COARSE AGGREGATE CLASS I RIPRAP -SEE PLATE 3.13-1 COARSE AGGREGATE** CLASS I RIPRAP
wet storage required (cy) (67*DA) 33.5 wet storage required (cy) (67*DA) 43.6
bottom of stone weir (ft) 600.43 bottom of stone weir (ft) 587.53
wet storage provided at this elevation (cy) 33.5 wet storage provided at this elevation (cy) 43.6 GRAPHIC SCALE
slope of wet storage sides 2:1 slope of wet storage sides 3:1
weir length (ft) (6xDA) 3.0 weir length (ft) (6xDA) 3.9 20 0 0 20 40
dry storage: bottom of trap elevation (ft) 599 dry storage: bottom of trap elevation (ft) 585
dry storage required (cy) (67*DA) 33.5 bottom trap dimensions: 4'x91' dry storage required (cy) (67*DA) 43.6 bottom trap dimensions: 15'X48'
crest of stone weir 601.20 top of dam elevation (ft) 602.20 crest of stone weir 587.41 top of dam elevation (ft) 590 ( 1N LLLT )
dry storage provided at this elevation (cy) 33.5 top width of dam (ft) 6' dry storage provided at this elevation (cy) 43.6 top width of dam (ft) 8' t inch - 20 ft.
slope of dry storage sides 2:1 top trap dimensions 15'x144' slope of dry storage sides 3:1 top trap dimensions 47'X88'
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SCALE
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SHEET NO.
5
EROSION CONTROL *VIROINIA EROSION & SEDIMENT *
.
VIROINIA EROSION & SEDIMENT
EROSION CONTROL * y NDBOOK SPECIFICATION NUMBER CONTROL k
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CONTRACTOR STAGING AREA XX'X'X' 4TH Q��
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OCE CONSTRUCTION ENTRANCE 3.02
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PROPOSED SAFETY \ XX�X ♦ O -
CR CRS CONSTRUCTION ROAD STABILIZATION 3.03 II FENCE AROUND _X Lic. No. 035791,E
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SED�IMENT TRAP \ IP J X XX X�X ♦ ♦ �� 9/16/20
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\LIMITS OF DISTURBANCE OR DIVERSION
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SAF SF
NOTE: THIS CONSTRUCTION ENTRANCE SHALL BE
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_ - �
\ • C - - - - W/ WIRE CONTRACTOR. ALL CONSTRUCTION TRAFFIC IN THIS
W N SUPPORT I.-_/ SF _ - - - - - - _ _ AREA SHALL UTILIZE THIS CONSTRUCTION ENTRANCE. o
-- ---------
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----------------- - -
TP I � \ � \ � � _ \ _ � SUPPORT
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OTE: THIS CONSTRUCTION ENTRANCE SHALL BE �x X X-X-_ �
STALLED, OPERATED, AND MAINTAINED BY THE 0LIMITS OF DISTURBANCE (TYP.) x „
ONTRACTOR. ALL CONSTRUCTION TRAFFIC IN THIS
REA SHALL UTILIZE THIS CONSTRUCTION ENTRANCE.
Sediment Trap design #1
drainage area (acres) (< 2 ac)
0.58
trap volumes:
elevation (ft) area (sf) volume(cf)
volume(cy)
587.00 256.0 0
0.0
588.00 756.0 484
17.9
589.00 1018.0 1,368
50.7
590.00 1309.0 2,528
93.6
0 0 0
0.0
wet storage:
wet storage required (cy) (67*DA)
38.9
bottom of stone weir (ft)
588.64
wet storage provided at this elevation (cy)
38.9
slope of wet storage sides
2:1
dry storage:
dry storage required (cy) (67*DA)
38.9
crest of stone weir
589.63
dry storage provided at this elevation (cy)
38.9
slope of dry storage sides
21
,' VARLABLE'
CREST OF STONE WEIR
VARIABLE'
ORIGINAL
GROUND
\
ELEV.
\y
DRY STORAGE
VARIABLE
WET STORAGE
(EXCAVATED)
FILTER CLOTH
ORIGINAL
GROUND
1
ELEV.
-SEE PLATE 3.13-1
COARSE AGGREGATE �•
CLASS I RIPRAP
weir length (ft) (6xDA)
3.5
bottom of trap elevation (ft)
587.00
bottom trap dimensions:
13'X40'
top of dam elevation (ft)
590.63
top width of dam (ft)
6'
top trap dimensions
25'x53'
ROSSER ASSOCIATES
ZONING. CO COMMERCIAL OFFICI
TAX MAP 60 PARCEL 25
Sediment Trap design #3
USE: OFFICE
drainage area (acres) (< 2 ac)
0.97
trap volumes:
elevation (ft) area (sf) volume(cf)
volume(cy)
585 426 0
0.0
586 836 620
22.9
587 1335 1,695
62.8
588 1897 3,303
122.3
589 2518 5,503
203.8
wet storage:
wet storage required (cy) (67*DA)
65.0
bottom of stone weir (ft)
587.04
wet storage provided at this elevation (cy)
65.0
slope of wet storage sides
2:1
dry storage:
dry storage required (cy) (67*DA)
65.0
crest of stone weir
588.09
dry storage provided at this elevation (cy)
65.0
slope of dry storage sides
2:1
1-1 VARIABLE
ORIGINAL
GROUND
CREST OF STONE WEIR
\
'JARIABLE•
ELEV.
\,-1
1 .O'
DRY STORAGE
-
N
r VARIABLE
WET STORAGE
a• L1Ax.
(EXCAVATED)
FILTER CLOTH
ORIGINAL
GROUND
ELEV.
-SEE PLATE 3.13-1
COARSE AGGREGATE•
CLASS I RIPRAP
weir length (ft) (6xDA)
5.8
bottom of trap elevation (ft)
585
bottom trap dimensions:
15'X48'
top of dam elevation (ft)
590
top width of dam (ft)
8'
top trap dimensions
47'X88'
TP
/ GRAPHIC SCALE 20 o o 20 40
( IN FEET )
1 inch = 20 ft.
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JOB NO.
202187
80
SCALE
1►►=20
SHEET NO.
7
VIROINIA
EROSION & SEDIMENT
EROSION CONTROL * y NDBOOK SCONTROL
SPECIFICATION NUMBER �-
� I
SA SAFETY FENCE 3.01
I
CE CONSTRUCTION ENTRANCE 3.02
CR CRS CONSTRUCTION ROAD STABILIZATION 3.03
SFx x x SILT FENCE 3.050 I _
II r I I II
lP STORM DRAIN INLET PROTECTION 3.07
I I I I
I I
DD TEMPORARY DIVERSION DIKE 3.09
L
RW TEMPORARY ROW DIVERSION 3.11
ST SEDIMENT TRAP 3.13 \ II
e
SB SEDIMENT BASIN 3.14 - -
OP OUTLET PROTECTION 3.18
\ J
NOTE: SILT FENCE, SAFETY FENCE, AND
RR Y RIPRAP 3.19 \ \ \ TREE PROTECTION SHALL BE INSTALLED /
- AT LIMITS OF DISTURBANCE. THESE ARE
- - - - - OFFSET FOR GRAPHICAL PURPOSES. -
CD UTILITY STREAM CROSING 3.25 ---
DRAINAGE DIVIDES ARE MEASURED AT THE /
LIMITS OF DISTURBANCE OR DIVERSION
y
TS TS TEMPORARY SEEDING 3.31 \ \ \ - - - - - - DIKE.
PS PS PERMANENT SEEDING 3.32 \ \-/'(/ • ��
\
TREE PROTECTION 3.38
DC DC DUST CONTROL 3.39 DRAINAGE DIVIDE (TYPE) ` II
BM SOIL STABILIZATION BLANKET 3.36
j' CONTRACTOR STAGING AREA
WITH FUELING TANK, DUMPSTER,
AND PORTA-POTTIES
PROPOSED SAFETY
FENCE AROUND `.
SEDIMENTTRAP '\ I
SCOTT R. LLINS'Z
Lic. No. 035791,E
9/16/20
'� V , X� X�X ®► ®♦ ° �SSIONAL EGOS
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NOTE: THIS CONSTRUCTION ENTRANCE SHALL BE - - - - - _ SAF SF INSTALLED, OPERATED, AND MAINTAINED BY THE
\ - - - - - - -
W/ WIRE CONTRACTOR. ALL CONSTRUCTION TRAFFIC IN THIS w N
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\ I -------I--- - - -
DID
12'x7o' MIN.
OTE: THIS CONSTRUCTION ENTRANCE SHALL BE
STALLED, OPERATED, AND MAINTAINED BY THE
ONTRACTOR. ALL CONSTRUCTION TRAFFIC IN THIS
REA SHALL UTILIZE THIS CONSTRUCTION ENTRANCE.
Sediment Trap design #1
drainage area (acres)
(< 2 ac)
0.31
trap volumes:
elevation (ft)
area (sf) volume(cf)
volume(cy)
587.00
256.0
0
0.0
588.00
756.0
484
17.9
589.00
1018.0
1,368
50.7
590.00
1309.0
2,528
93.6
I 0
0
0
0.0
wet storage:
wet storage required (cy) (67*DA)
bottom of stone weir (ft)
wet storage provided at this elevation (cy)
slope of wet storage sides
dry storage:
dry storage required (cy) (67*DA)
crest of stone weir
dry storage provided at this elevation (cy)
slope of dry storage sides
20.8
588.09
20.8
ORIGNAL
GROUND
ELM
-SEE PLATE 3.13-1
1' VARLABLE'
CREST OF STONE WEIR I ,,,* I
DRY STORAGE
N
TP
590.63
N z z
SAF N LU
PAVILION I V 1 - �P}�`1 OcrN 1� � � i �� WZD
PARKING LEVEL FFE=607.00 1 PARKING LEVEL FFE=603.33 �i 1 i i l / �� l i J z U
(PHASE 2) 1 (PH, rE 1) l i i i i i i s 1 i l / / Z �. -i
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ROSSER ASSOCIATES -
ZONING: CO COMMERCIAL_ OFFICE TP
TAX MAP 60 PARCEL 25
USE: OFFICE
1 .O'
._. VARIABLE i
WET STORAGE 1 1
4' MAX.
(EXCAVATED)
1 FILTER CLOTH ORIGINAL
GROUND
ELEV.
COARSE AGGREGATE CLASS I RIPRAP
weir length (ft) (6xDA)
bottom of trap elevation (ft)
20.8 bottom trap dimensions:
588.72 top of dam elevation (ft)
20.8 top width of dam (ft)
2:1 top trap dimensions
1.9
587.00
13'X40'
590.63
6'
25'x53'
GRAPHIC SCALE
10 20 / 40
( IN FE T )
1 inch = 20 ft.
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SCALE
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SHEET NO.
8
PRE -DEVELOPMENT STORMWATER MANAGEMENT PLAN, SCALE 1"=50'
w3CIA
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i�o
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\ O//_/0
41 �DQ 1gg6�23 vOUS SHEET FOR DES GN / ,
8 �r� .1 GEN OUTLET
TVNO IAT- IVY
OF OUTLETP C UTLE ECTO ORSER TO REDUCE
■ \ TOE THE CLDIBI d
- BEGLOPEDTOI PROPOSED HDPESTANDPPEWTHTRasHR ERSER
SOIL THEFLDOROFDETENTDUSBANISHALL EE
RISER (R.5ARM N) CONTRACTOR SHALL NSTALL A GENTLY SLOPED CH - STRUCTURE SEE DETA L °N TH S SHEET ° REDO VAEENT, EDR TRASHRACI. R SER R M
\ AT H BASNS LOW PONT TO ENSU RE POSTVE DRA NAGS THROU OUT --- V.589.8D.RSER TO HAVEDNE'B LOW FLOW OR F CEI NV.58600112 HOPE
DHT 58E.D9 TOPRE VENT ELDTATDNTHERISER BASE SHALL BE
ENFORCEDC°NCRETE FOUNDATION
TYP
E -s �RMLrEE DAN,BTHERR
r � � � RELDWGRDHND.
THATIG
7
1
SOIL �'�
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TYPE - LINE (TYP.) ■
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wow EXISTING DEVELOPMENT'S _ i' ■ ROPD=ED01zH
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oo�w • - ro sERVEAS THEasER STARu°crunwsEEOEATn porvR
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YED�N ■ DRAINAGE AREA TO REMAIN F gs` LBooaDE,r°ooEo"�,ALLP°ESEaW
z OU
SO
Jdo SE SHALL TO PREVENT
11FLOTATION INTOTHE
AD 11
�x UNDISTURBE - EDCONCRETEFOUNDATONTHAT
I1 ■
Z 56z6IAND BIUR D GROUND
1.49 ac. ♦ II SUBAREA A ■ FT oWQ-
CN=87 ♦ 1.70 ac.
EXISTING SAND _FILz ER CN=63 ■ �o�N
PER APPROVED Tc=0.24 hrs. ` ■`I SIDEGARES �zQ=
SDP-2007-0008;5 ,o
AIB
■ I • I \ ■ THIS SNEOETfO�
■ I / \ . OTECTION
DIMENSIONS
-� SOIL `
z / TYPE
- - -
■
If / ■
� �� LOD USED FOR WATER
I
" I I QUALITY CALCULATIONS ■ '�
•
•. . I ■
i
(D.B.2260 225 PLA 1 _ 215BUILDING SETBACK LINE
• Tc=0.24 hrs.'
\ I \ r ico' OF OL w/ A ELEV.=z'
/ \ OF CO
358 ' V NC. FLOW / A ELEV.=20' _
0 -
\ _- -
/FE
--- /-/SOIL //
-_ - - - 598
I - �
l
I /
� r
- 30' SETBACK LINE U s I y
(D.B. 1896-238 PLA j' • ) (/ �s� _ -
// I YPE
ISC
SOIL
_ I
----------------
Pre -Development Impervious Area Summary ---- - - - - Pre -Development Impervious Area Summary
Subarea A, Water Quantity U.S. S. ROUTE 250 LOD, Water Quality
Building/Structure 1,213 sf Building/Structure 0 sf
Roads/Driveways 3,361 sf -- Roads/Driveways 8,964 sf
4,574 sf 8,964 sf
POST -DEVELOPMENT STORMWATER MANAGEMENT PLAN, SCALE 1"=50'
l \ _
BLOCK RETAININGPOLF
waL�
�QI
W 3 �
V Q �
W EO
d lyd 41
-L3$ I . EEE GENERAL EW °TES 40N VO SSHE OR DESIGN
■ PEAT) OF OUTLET PROT OU ETP CTO TOE T RIS�G, F
ENE d S
JhY
THE FLOOR OF DETENTION BASIN'B SHALL BE SLOPED HE --- PROPOSED HOPESTANDPPE 1 LHORASHRACLENTF ITIS HR SER
z
R.RSERRM
SLOPED FEE OR EOU VAEENT FORTRASHRAC
,o E
W RALSTALL DP R . 59HEET
LL TTHE POINT PORT THRD° DDT. DNEIBLDW-aDWDRE�E,NVBBEBD,I�HDPE
TDPREH ENTFATDNTNCRET FOUNDATION
/ n Nie TH BASE SHALL BE
CK REINFORCEDCONCRETE FOUNDATION
BELDWGRD°ND
�I
T OR
�\ B
rI
GENERAL SWIM FACILITY NOTES:
1. CONTRACTOR SHALL CALL THE COUNTY INSPECTOR & ENGINEERING DEPARTMENT 24-HOURS BEFORE ANY ANTICIPATED CONSTRUCTION ACTIVITIES FOR THE BMPs. THIS
IS INCLUSIVE OF WHEN THE UNDERGROUND DETENTION SYSTEM SUBGRADE IS READY FOR PIPE CONSTRUCTION, BUT BEFORE STONE BEDDING IS INSTALLED.
2. PROPOSED OUTLET PROTECTION BELOW THE UNDERGROUND DETENTION SYSTEM'A' OUTFALL TO CONSIST OF A io' WIDE, 4 LONG, 18" DEEP VDOT CL. Al RIPRAP
LINED APRON WITH FILTER FABRIC UNDERLAYMENT. APRON TO BE LOCATED BETWEEN THE PROPOSED ENDWALL AND THE BASIN FLOOR, AS SHOWN. OUTLET
PROTECTION SHALL THEN TRANSITION TO A FLAT/ o% GRADE AT THE BASE OF THE EMBANKMENT & SHALL EXTEND TO THE DETENTION BASIN 'B' RISER
STRUCTURE TO REDUCE THE RISK OF SCOUR & ORIFICE CLOGGING. FILTER FABRIC UNDERLAYMENT SHALL BE KEYED INTO THE EXISTING GROUND A MINIMUM OF
9" AT THE ENDS & ALONG THE PERIMETER. EDGES OF FILTER FABRIC SHALL OVERLAP A MINIMUM OF 12".
3. THE DETENTION BASIN A EMBANKMENT SHALL BE CONSTRUCTED IN ACCORDANCE WITH THE DETAILS &DESIGNS SHOW
N ON THIS PLAN.
4 I F
. LOW -FLOW ORIFICE DIAMETERS LESS THAN 3"ARE REQUIRED TO MEET MINIMUM ENERGY BALANCE CALCULATIONS. TO REDUCE THE RISK O CLOGGING,
UNDERGROUND
OUTLET PROTECTION BELOW
ALLY THE RIPRAP OU
THE DETENTION BASIN 'A' RISER. ADDITION
N ALL ORIFICES AND
TRASHRACKS ARE PROPOSED O ,
DETENTION SYSTEM 'A' WAS EXTENDED (AS DESCRIBED ABOVE IN #2) AT A o% SLOPE TO REDUCE THE RISK OF CLOGGING DETENTION BASIN B's LOW -FLOW
ORIFICE. ALSO, PRIVATE DROP INLET STIR. 4 IS PROPOSED TO HAVE A REBAR GRATE TRASHRACK ACROSS ITS THROAT's OPENING TO REDUCE THE RISK OF
CLOGGING THE LOW -FLOW ORIFICE IN UNDERGROUND DETENTION SYSTEM A.
STORMWATER MANAGEMENT NARRATIVE:
FT Ex STNG.. SIDEWAL TO SERVE \ p
AS ACCESS TO DETENTION BASIN
i _ _ OVERVIEW
THIS PROJECT PROVIDES STORMWATER MANAGEMENT (SWIM) PRACTICES TO MITIGATE THE IMPACTS FROM THE PROPOSED IMPROVEMENTS. THIS
\ STORMWATER MANAGEMENT PLAN COMPLIES WITH PART IIB SWIM REQUIREMENTS. THIS PLAN DOES NOT ALTER THE EXISTING DRAINAGE AREA TO THE
EXISTING SAND FILTER AND UNDERGROUND DETENTION SYSTEMS SERVING THE EXISTING THREE BUILDINGS AND AS SUCH ONLY THE PROPOSED
d / BUILDINGS ARE EVALUATED WITH THIS STORMWATER PLAN.
SUBAREA B = WATER QUALITY SUMMARY
I l
1. 13 ac. THE STORMWATER QUALITY REQUIREMENTS FOR THIS DEVELOPMENT ARE MET THROUGH THE BEST MANAGEMENT PRACTICE OF PURCHASING NUTRIENT l,
II CREDITS. A MINIMUM PHOSPHOROUS REMOVAL RATE OF 1.86 Ibs/yr IS REQUIRED. THE DEVELOPER WILL PURCHASE NUTRIENT CREDITS PRIOR TO THE
■ �I I I CN=82 ISSUANCE OF A LAND DISTURBANCE PERMIT.
Tc=0.24 hrs.
' � PLEASE SEE THE ATTACHED CALCULATIONS PACKET AND THIS SHEET FOR ADDITIONAL DETAILS.
(ROUTED THROUGH I
DETNETION BAIN 'I WATER QUANTITY SUMMARY
w u THE PROPOSED DEVELOPMENT HAS ONE CONCENTRATED OUTFALL. ITS DRAINAGE AREA (SUBAREAS A & B) MEETS MINIMUM CHANNEL AND FLOOD
I I PROTECTION REQUIREMENTS SET FORTH IN 9 VAC 25-870-66. SUBAREA A RECEIVES ATTENUATION VIA DRY SWALE 'A' INITIALLY, AND IS THEN
■ g I DIRECTED INTO DETENTION BASIN 'I SUBAREA B's INFLOWS AND SUBAREA A's ROUTED OUTFLOWS WERE SYNCHRONIZED. THE SYNCHRONIZED STORM
j EVENTS WERE THEN ROUTED THROUGH DETENTION BASIN 'I THE RESULTANT DETENTION BASIN 'B' ROUTED OUTFLOWS ARE COMPLIANT WITH
FE MINIMUM COUNTY & STATE REQUIREMENTS.
l IN SUMMARY, CHANNEL PROTECTION FOR SUBAREAS A & B IS MET THROUGH 9VAC25-870-66 SECTION B.3.a (ENERGY BALANCE) AND FLOOD
PROTECTION IS MET THROUGH 9VAC25-870-66 SECTION C.2.b. (10yr. POST FLOW < 10 yr. PRE FLOW). COMPLIANCE WITH THESE SECTIONS IS
L - w ACHIEVED PRIMARILY THROUGH THE PROPOSED DETENTION BASIN 'B' AND THE PROPOSED DETENTION BASIN 'I PLEASE SEE THE ATTACHED
U \ CALCULATIONS PACKET AND THIS SHEET FOR ADDITIONAL DETAILS.
A, w
O N (DO,
FEE � _
W
J z a w Q \ \, 1 I DETENTION BASIN 'B' CONSTRUCTION NOTES:
EXISTING DEV 'L PMENT \ - I SE1012HDPIFTANDPPEWTHTRASHRAER
o CO CE ] \ OR DUE,.RTR^ °aC R ER FACILITY PLANTING SPECIFICATIONS:
w a 11 DRAINAGE AREA TO REMAIN RISER'. HAVE
YB<� Y 8�� . I • ] 0 \ IT e S ' BU F�°'" ONTIEAEE 1. THE DETENTION BASIN SHALL HAVE A TURF GROUND COVER, SUCH AS GRASS OR SOME OTHER FORM OF A VEGETATIVE GROUNDCOVER. LANDSCAPING BEYOND THIS IS OPTIONAL
UNDISTURBED ONMBTEFOU6
X 1.4 I 0 \ \ 0 56a6,AN0BUREDBE OWGRAUN�DA'°"'"AT AND IS NOT REQUIRED FROM A STORMWATER MANAGEMENT STANDPOINT. HOWEVER LANDSCAPING MAY BE PROPOSED WITHIN THE FACILITY. SEE LANDSCAPING PLAN FOR
o~ �~ 9 ac. I Qaw ADDITIONAL DETAILS PERTAINING TO THE SITE's OVERALL LANDSCAPING REQUIREMENTS.
NovDO a 2. THE PROPOSED INTERIOR SIDE SLOPES OF THE BASIN SHALL BE A MAXIMUM OF 3:1 TO REDUCE THE RISK OF EROSION. THE PROPOSED FLOOR SLOPES SHALL BE GRADED TO PROVIDE
CN=87 / • ♦ >LL` 0 r Q�oo POSITIVE DRAINAGE AT ALL TIMES TO THE RISER STRUCTURE.
oww ` \ 8a 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
� TO EXISTING=SAND=FIE ER ��� \ �wa 1 � �,OQ�
PER APPROVED "I = \ ` , "x STRUCTURE.
. • a I SIDE SLOP GO `
o4. THE SOILS IN THE STORMWATER BUFFER AREA ARE OFTEN SEVERELY COMPACTED DURING THE CONSTRUCTION PROCESS, TO ENSURE STABILITY THE DENSITY OF THESE COMPACTED
-p o SDE-2DO7-OOII85 N 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.
1 5. EXTRA MULCHING AROUND THE BASE OF TREES AND SHRUBS IS STRONGLY RECOMMENDED AS A MEANS OF CONSERVING MOISTURE AND SUPPRESSING WEEDS.
I
(� CONTRACTOR REQUIREMENTS..
TABLE ON
• THIS RHEEEIT
TFOR 1. THE CONTRACTOR SHALL BE RESPONSIBLE FOR LAYOUT OF ALL WORK COVERED UNDER THESE PLANS.
E7- ICU
DIMENSIONS 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
I ♦� - $ 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.
♦ z / ♦ I 3. ALL PLANT MATERIAL SHALL MEET THE MINIMUM SPECIFICATIONS AND STANDARDS DESCRIBED IN THE CURRENT ISSUE OF THE AMERICAN STANDARD FOR NURSERY STOCK,
m ELE o - - _• /� 0 CI PUBLISHED BY THE AMERICAN ASSOCIATION OF NURSERYMEN, 1250 STREET, NW, SUITE 500, WAS HINGTON, DC 20005.
■ d mw 4. THE CONTRACTOR SHALL VERIFY ALL DIMENSIONS IN THE FIELD AND NOTIFY THE DESIGNER OF ANY VARIANCE FROM THE PLAN.
Q Q�
Q W 5. THE LANDSCAPE CONTRACTOR IS RESPONSIBLE FOR VERIFYING THE LOCATION OF ANY ONSITE UTILITIES (CALL MISS UTILITY 1-800-552-7001 BEFORE ANY EXCAVATION).
oV, #v -� - - I I - - Tc-0.28 hrs. 6. REFER TO THE APPROVED FINAL SITE PLANS FOR ANY DETAILED SITE INFORMATION.
■ N1 i I 90' OF OLF wl A 7. ALL WORK SHALL BE COORDINATED WITH OTHER PARTIES.
■ �I m ■ ■ man SUBAREA A ELEV.-1' 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
• 28' OF CONC. FLOW GROWN PLANTS WILL BE TRANSPORTED IN THE CONTAINERS IN WHICH THEY HAVE GROWN.
■ 0.58 ac. w/ A ELEV.-I.5' 9• ALL PLANT MATERIAL, UNLESS OTHERWISE SPECIFIED, SHALL BE UNIFORMLY BRANCHED AND HAVE A VIGOROUS ROOT SYSTEM. PLANT MATERIAL SHALL BE HEALTHY, VIGOROUS, AND
■ I CN =85 130' CHANNEL FLOW FREE FROM DEFECTS, DECAY, DISEASES, INSECT PEST EGGS, AND ALL FORMS OF INFESTATION. ALL PLANT MATERIAL SHALL BE FRESH, FREE FROM TRANSPLANT SHOCK OR VISIBLE
■ - IN PIPES-0.01 HRS WILT. PLANTS DEEMED UNHEALTHY WILL BE REJECTED.
Tc= 0.28 hrs. 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
(ROUTED TO DRY SWALE 'A' STOCK WITH POORLY DEVELOPED ROOT SYSTEMS WILL NOT BE ACCEPTED.
• . I • / THEN THROUGH DETENTION 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
• I r BASIN 'I I I THE WIND AND SUN. PLANTS STORED ON SITE SHALL BE PROTECTED FROM ANY DRYING AT ALL TIMES BY COVERING THE BALLS OR ROOTS WITH MOIST SAWDUST, WET BURLAP,
WOOD CHIPS, SHREDDED BARK, PEAT MOSS, OR OTHER SIMILAR MULCHING MATERIAL.
/ 1) 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 �J �� THE DESIGNER.
13. MINOR FIELD ADJUSTMENTS MAY BE NECESSARY DUE TO SITE CONDITIONS (EX: ROOTBALL AND UTILITY CONFLICT). MAJOR ADJUSTMENTS MUST BE APPROVED BY THE DESIGNER.
j 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 SUFFICIENT TO CONTAIN THE ENTIRE ROOT BALL OR ROOT MASS, WITHOUT
(D.6.2260-225 PLA ` ' / _ 215 ING SE-rmcK LINE - - - - CRAMPING ROOTSTOCK.
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.
y Tc-0.24 hrs. � 17. THE CONTRACTOR IS RESPONSIBLE FOR REMOVAL AND DISPOSAL OF TRASH AND DEBRIS WITHIN THE LIMITS OF THE PLANTING ON A DAILY BASIS.
\ 100' OF OLF w A ELEV.-2' �- PROPOSED BOUNDAI 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.
\ 195' OF CONC. FLOW w/ ELEV.=11' - FOR THE ESC LIMIT
400' CHANNEL FLOW IN PIPES 0.02 HRS _ \ OF DISTURBANCE ( FACILITY CONSTRUCTION
/ __ DEFINES THE
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
FOR THE VRRM \\ _ - - - PROPOSED SIZING RULE (EROSION AND SEDIMENT CONTROL REQUIREMENTS VS. STORMWATER TREATMENT REQUIREMENTS). INSTALLATION OF THE PERMANENT RISER SHALL BE INITIATED
WAT AT
DURING THE CONSTRUCTION PHASE, AND DESIGN ELEVATIONS SHALL BE SET WITH FINAL CLEANOUT OF THE SEDIMENT BASIN AND CONVERSION TO THE POST -CONSTRUCTION
/ QUALITY FACILITY IN MIND. APPROPRIATE PROCEDURES SHALL BE IMPLEMENTED TO PREVENT DISCHARGE OF TURBULENT WATERS WHEN THE BASIN IS BEING CONVERTED TO AN DETENTION
REQUIREMENTS, TYF BASIN.
2. THE DETENTION BASIN SHALL ONLY BE CONSTRUCTED AFTER THE CONTRIBUTING DRAINAGE AREA TO THE FACILITY IS COMPLETELY STABILIZED. IF THE SITE OF THE PROPOSED SWM
/ > T, / 26-21 FACILITY 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
/ / / / / / / ti°3 �� // oeoy,a 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.
7�_ 3. THE CONTRACTOR SHALL ASSEMBLE 7 l
CONSTRUCTIONROJECT MAKING
THEY DESIGN SPECIFICATIONS AND ARE PREPARED AT STAGING AREAS WHEN POSSIBLE.
4. THE CONTRACTOR SHALL CLEAR AND
- - 6
- 9 5
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 NTRA T R HALL AL IN TALL THE RI ER TFL W TR T RE AND R THE BAR WITH PERMANENT LLAR D RIN THEE PHA E T EN RE THE TOP INVERT F THE
_ � co cos so s s ou o s uc u /o B (s) co s u G sc s o su o 0
OVERFLOW WEIR IS CONSTRUCTED LEVEL AT THE 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
_ - I EQUIPMENT. THE CONTRACTOR SHALL ALSO ADHERE TO THE CLAY LINER SPECIFICATIONS OUTLINED IN TABLE 14.4 BELOW:
w✓
-
Post -Development Impervious Area Summary 1896-238 PLA (/
Subarea A, Water Quantity
ROCK WALL (� \ i f ROCK WALt�
Building 13,017 sf - -
Parking Areas/Roads 2,995 sf - -
WER & TELEPHONE LINE /...-
Sidewalks & Concrete 296 sf
16,308 sf --
Property
Test Method
Unit
Specification
Pernlea!Aity
ASTM D-2434
Cmisec
1 x 10
Plasticity Index of Clay
ASTM D-A231424
%
Not less than 15
Li uid Limit at Cla
ASTM D-2216
%
Nat less than 30
Cla{Particles Passing
ASTM D-422
%
Nat less than 30
Clay Compaction
ASTM D-2216
IN
95% of standard prodar dens
Subarea B, Water Quantity
Post -Development Impervious Area Summary
\ LOD, Water Quality
9, UPON COMPLETION OF THE 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.
Building 23,621sf
- _ _ _ _ _
EDGE OFPAV Building 35,416sf
10. CONTRACTOR SHALL THEN CONSTRUCT THE EMERGENCY SPILLWAY IN CUT OR STRUCTURALLY STABILIZED SOILS,
11. THE CONTRACTOR SHALL THEN FINISH CONSTRUCTION OF ALL OUTLET STRUCTURES, INCLUDING DOWNSTREAM RIP -RAP APRON PROTECTION.
Parking Areas/Roads 4,125 sf
U.S. ROUTE 250 Parking Areas/Roads 12,875 sf
12. THE CONTRACTOR SHALL NEXT STABILIZE EXPOSED SOILS BY HYDROSEEDING OR SEEDING OVER STRAW.
Sidewalks &Concrete 698 sf
Sidewalks &Concrete 994 sf
13. THE CONTRACTOR SHALL THEN INSTALL THE APPROPRIATE BASIN LANDSCAPING IN ACCORDANCE WITH THE APPROVED PLANS.
FACILITY MAINTENANCE•
28,444 51 49,285 sf
sa o ,5 GRAPHIC SCALE 30 60 120 3a o ,5 GRAPHIC SCALE 30 60 120
( IN FEET )
1 inch = 30 ft.
WATERSHED SUMMARY
Area,
CN ac.
1-year Flow,
cfs
2-year Flow,
cfs
10-year Flow,
cfs
DA A (Pre-Dev)
63 1.71
0.73
1.39
3.91
CN Area,
1-year Flow,
2-year Flow,
10-year Flow,
DA A & B (Post-Dev)
83 1.71
0.18
1.35
3.91
NOTE: Sub-Area'A' is routed through Dry Swale Wand then through Detention Basin 'B'. Sub -Area B is
routed through Detention Basin `13'
( IN FEET )
1 inch = 30 ft.
CHANNEL & FLOOD PROTECTION SUMMARY
Pre-Dev. Post-Dev. Method of 9VAC25-870-66 Method of 9VAC25-870-66 Method of 9VAC25-870-66 Method of 9VAC25-870-66
Subarea Subarea Channel Protection Compliance Limits of Analysis for Channel Flood Protection Compliance Limits of Analysis for Flood Protection
Protection
A A & B Section B.3.a (Enerev Balance) N/A (Enerev Balance Satisified) ISection C.2.b (10-vr. Post Flow < Pre Flow) I N/A (10-vr. Post Flow < Pre Flow Satisified)
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 FIRST YEAR 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 NOTE THE
PRESENCE OF ANY INVASIVE PLANT SPECIES, AS APPLICABLE.
3. INSPECT THE CONDITION OF STORMWATER INLETS TO THE BASIN FOR MATERIAL DAMAGE, EROSION OR UNDERCUTTING.
4. INSPECT THE BANKS OF UPSTREAM AND DOWNSTREAM CHANNELS, IF APPLICABLE, FOR EVIDENCE OF SLOUGHING, ANIMAL BURROWS, BOGGY AREAS, WOODY GROWTH, OR GULLY
EROSION THAT MAY UNDERMINE EMBANKMENT INTEGRITY.
5. INSPECT BASIN OUTFALL CHANNEL, IF APPLICABLE, 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 ALL TRASH 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 OF THE BASIN FOR EVIDENCE OF SPARSE VEGETATIVE COVER, EROSION, OR SLUMPING.
10. OWNER OR CONTRACTOR SHALL MAKE NEEDED REPAIRS IMMEDIATELY.
FACILITY INSPECTION:
MULTIPLE INSPECTIONS ARE CRITICAL TO ENSURE THE BASIN(s) ARE PROPERLY CONSTRUCTED. BECAUSE THE TIMING OF THE INSTALLATION IS DICTATED BY THE 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. INITIAL SITE 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 OF THE EMBANKMENT, THE RISER/PRIMARY SPILLWAY, AND THE OUTLET STRUCTURE(s).
6. PLANTING PHASE (WITH AN EXPERIENCED LANDSCAPE ARCHITECT PRESENT/DIRECTING IF APPLICABLE)
7. FINAL INSPECTION (DEVELOP A PUNCH LIST FOR FACILITY ACCEPTANCE)
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9/16/20
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SHEET NO.
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DRY SWALE 'A' DETAIL, SCALE 1"=20'
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i _-PROPOSED 012" HDPE STANDPIPE WITH TRASHRACK
\ TO SERVE AS THE RISER STRUCTURE. SEE DETAIL ON
THIS SHEET, OR EQUIVALENT, FOR TRASHRACK. RISER
1 I RIM ELEV.=601.90. RISER TO HAVE ONE 8" LOW -FLOW
\ r \ ORIFICE (INV.=600.00). 10" HDPE OUTFALL PIPE INV
I OUT=596.70. TO PREVENT FLOTATION THE RISER
6" INTO AN 8"
BASE SHALL BE FIRMLY EMBEDDED 1
THICK REINFORCED CONCRETE FOUNDATION THAT
IS 6'x6', AND BURIED BELOW GROUND.
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ROUND E RI E TRASH RACK (OR EQUIVALENT)
CONCRETE MANHOLE
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DIMENSIONS IN INCHES
PLAN
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SturrnRaxTm Round Series for Concrete Mal1h*
Part No.
DTm A
Dim B
Dkn C
Min ID
Min Did
RS-24
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Plastic Solutjws, hie.
PO Box 4366, WI nch nler, VA 2.26134
4•`1 Z39 MLChee Rd, Wn&esoer, VA 22#43
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DETENTION BASIN 'B' DETAIL, SCALE 1"=20'
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THE RISK OF CLOGGING. F�N
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THE FLOOR OF DETENTION BASIN'B' SHALL BE SLOPED TO DRAIN TO THE PROPOSED 012" HDPE STANDPIPE WITH TRASHRACK TO SERVE AS THE RISER
-RISER (o.5o% MIN.). CONTRACTOR SHALL INSTALL A GENTLY SLOPED CHANNEL STRUCTURE. SEE DETAIL ON THIS SHEET, OR EQUIVALENT, FOR TRASHRACK. RISER RIM
AT THE BASIN's LOW POINT TO ENSURE POSITIVE DRAINAGE THROUGHOUT. \ d'\ ELEV.=589.80. RISER TO HAVE ONE 1.9" LOW -FLOW ORIFICE (INV.=586.00). 12" HDPE
d _ \ ` OUTFALL PIPE INV OUT=586.09. TO PREVENT FLOTATION THE RISER BASE SHALL BE
FIRMLY EMBEDDED 6" INTO AN 18" THICK REINFORCED CONCRETE FOUNDATION
�C � 4� �� — � � ,� � �� THAT IS 6'x6', AND BURIED BELOW GROUND.
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OUWRrER SECTION
REINOY,iBLE FOR ADC E55
ISOMETRIC
CONCRETE STRUCTURE DIMENMONS
INSIDE STRUCTURE DIMENSION
OUTS-1 DE STRUCTU RE 01 ME NSI ON
AVAILABLE OPTIONS
CROSS B RAC I N C FOR OVERHANG
HDPE ,ANTI -VORTEX PLATE
CUSTDMER DATE'
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EMBANKMENT NOTES:
AFTER AN INVESTIGATION OF THE SITE'S SOILS, SITE VISITS, AN ANALYSIS OF THE SURVEYED TOPOGRAPHY AND AN
EXAMINATION OF VA DEQAPPENDIX 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.
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