HomeMy WebLinkAboutWPO202000055 Plan - Revision WPO VSMP 2020-12-07GENERAL NOTES
VICINITY MAP
SCALE: 1" = 500'
/A
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 SO' 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'
(WP02020=
SAMUEL MILLER DISTRICT
ALBEMARLE COUNTY, VIRGINIA
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SPECIAL PERMIT CONDITIONS z
iCOTT/R. M-LLINS�
Lic. No. 035791.n
9/16/20
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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,
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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.
3. THE ENTRANCE ROAD SHOWN ON THE CONCEPTUAL PLAN SHALL BE CONSTRUCTED BY THE APPLICANT TO AN URBAN ROAD
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
COMMUNITY DEVELOPMENT AND ENGINEERING AND PUBLIC WORKS, ALONG ONE SIDE CONNECTING THE INTERIOR LOOP TO THE
61
PUBLIC SIDEWALK AT IVY ROAD.
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4. ALL ROADS ON THE PROPERTY CONNECTING TO ADJACENT PROPERTIES AS SHOWN ON THE CONCEPTUAL PLAN SHALL BE
CONSTRUCTED BY THE APPLICANT TO AN URBAN SECTION STANDARD, WITH A MINIMUM WIDTH OF TWENTY (20) FEET, FINAL
WIDTH TO BE DETERMINED AT THE TIME OF FINAL SITE PLAN APPROVAL BY THE DIRECTOR OF ENGINEERING AND PUBLIC WORKS.
ALL ROADS CONNECTING TO ADJACENT PROPERTIES SHALL INCLUDE A SIDEWALK OR OTHER APPROPRIATE PEDESTRIAN PATH
ALONG ONE SIDE, CONSTRUCTED TO A STANDARD ACCEPTABLE TO THE DEPARTMENTS OF PLANNING AND ENGINEERING AND w
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\ PUBLIC WORKS, PROVIDING A CONNECTION TO THE PUBLIC SIDEWALK ~Q
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5. AN ACCESS EASEMENT HAS BEEN DEDICATED ON THE SUBJECT PROPERTY FOR TRAFFIC FROM THE N/F KAPPA SIGMA PROPERTY
y? (TAX MAP 60 PARCELS 27 AND 27B DB 2226-218 225 PLAT & DB 2706-163 168 & 169 PLAT) THIS ACCESS SHALL BE
CONSTRUCTED BY THE APPLICANT TO THE SAME STANDARD AS REQUIRED IN CONDITION 4.
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
GROUP PROPERTY (TAX MAP 50, PARCEL 25) TO THIS CONSOLIDATED ENTRANCE (DB 2226-218, 225 PLAT & DB 2706-163, 168 & 169
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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
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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.
7. WITHIN EACH PAVILION SHOWN ON THE CONCEPTUAL PLAN, THE LARGEST CONDOMINIUM UNIT SHALL BE AT LEAST THIRTY
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
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:an
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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
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COST OF THE SIGNAL (CURRENTLY ESTIMATED TO BE $140,000). WHICH AMOUNT SHALL BE CALCULATED IN THE YEAR IN
IN
WHICH THE SECURITY IS PROVIDED. THE SECURITY SHALL CONTINUE SO THAT IT IS AVAILABLE TO PAY
FOR THE COST OF THE SIGNAL UNTIL TEN (10) YEARS AFTER THE DATE OF APPROVAL OF THIS SPECIAL USE PERMIT; SECURITY
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 ASPHALT
PROPOSED CONCRETE
PROPOSED PAVER (IMPERVIOUS)
BENCH MARK
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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JOB NO.
202187
SCALE
AS NOTED
SHEET NO.
1
T.M. 60 - 27 & 27B
KENRIDGE, LLC
D.B. 3109-387
D.B. 373-389 PLAT
USE: RESIDENTIAL
823.40'
N19°49'45"E
425,06'
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o.6 ACRES 738 P. 34of 2.85o ACRES 0)
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o.86 ACRES VEPCO EASEMENT
co 20' WATERLINE (D.B.2561-704)
EASEMENT; TYP.
D.B. 3059-532ca J L
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20'SEWER EASM'ENT
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m \ I DARRELL, JOHN STEWART, I SYCEXISAMO E
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20'& VARIABLE WIDTH P
CS I I ��� VIRGINIAIELECTRIC &
�\ VEP00 EASEMENT
IMITS OF PUBLIC � POWER CO PANY EASEMENT
1 20 WATER INE EASEMENT o.e.zas ao4)
I -i r ACCESS ESMT. VARIES; - ) 20" SPRUCE _ SAN. co. /
p , - 1 F, 2 B. 05 -532 i --nzoP=e0s.,,, �� (D.6�262-464)
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MIN. 30' - - _ -
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24
t�n� ' / 13627" DBL.
cn m .�- / / SPR/' I MAPLE CEDA�2 g o - - - - T 599.27'
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our sss s B 1896SETBAC AR LAT)
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AND FIRE HYDRANT - I T�
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EXISTING TREES TO � TRAVE_LWAY I _ _
l - 48ti, 1 v BE REMOVED ROJECT LIMITS EXISTING �r r SETBACK AREA
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{ a C10 \ VEPCO-EASEMENT , - - ,' , /
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® op I 2.295 ACRES TMP 60-26 EXISTING SAN. SEWER
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0.282 ACRE 3.438 ACRES
I ram-' I rn 30"v - DB.2660, PG.218 / EXISTING �
o MAGNOLIA •' OUNTY SEDIMENT
8 _ - - - , MANAGED STE TRAP i
4" v AG uA SLOPES /� TH CHESAPEAKE & 0 IO i� E H
D 30.01 36 \ - i - _ ,' O ERL (T S RAILWAY COMPANY
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IRON IS - 72.-06
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FOUND OHE
IMITS OF DISTURBANCE = 2.26 AC i - \' _ _- \
EXISTING /
EXISTING STAGGERED ROW OFFICE BUILDING
OF EVERGREEN TREES ON ADJACENT
PROPERTY
III
I
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LINE
BEARING
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
LINE
DELTA
RADIUS
ARC
TANGENT
CHORD
CHORD BEARING
C1
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
32°35'36"
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°35'35"
22.00
28.64
16.76
26.66
S67'05'03"E
CIO
38°41'37"
215.00
145.20
75.49
142.45
S85`02'02"E
C11
35°37'43"
185.00
115.04
59.45
113.20
N83°18'06"W
C12
88.56'07"
22.00
34.15
21.59
30.82
S34.24'59"W
C13
28°26'26
138.00
68.50
34.97
67.80
SO4°10'08"W
C14
22°54'25"
125.00
49.98
25.33
49.64
N08°22'13"E
C15
17°52'58"
22.00
6.87
3.46
6.84
N12°01'28"W
C16
69°50'57"
215.00
262.11
150.12
246.17
N10°13'24"E
C17
34.49'09"
110.00
66.85
34.49
65.82
N27°44'17"E
C18
3°26'31"
221.00
13.28
6.64
13.27
N12°02'58"E
C19
11 `51'25"
1952.90
404.14
202.79
403.42
S50`02'18"E
C20
84°09'50"
75.00
110.17
67.72
100.53
S65`22'07"W
C21
91°30'26"
17.00
27.15
17.45
24.36
N26°47'45"W
C22
26.11'25"
185.00
84.57
43.03
83.83
N32°03'11"E
C23
5°27'50"
140.00
13.35
6.68
13.35
N42°24'56"E
T.M. 60 - 25
ROSSER ASSOCIATES _ SAN. MH. A-1
D.B. 1083-50 -
D.B. 635-308 PLAT ! /
USE: OFFICE /
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GRAPHIC SCALE
( IN FEET )
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SCOTT/R. C7,Q INS'Z
Lie. No. 035791,n
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JOB NO.
202187
SCALE
ill=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 7HE 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 774E PUBLIC.
3.02 CONSTRUCTION ENTRANCE,
A STABILIZED PAVED CONSTRUCTION ENTRANCE WITH A WASH RACK LOCATED AT POINTS OF VEHICULAR INGRESS AND EGRESS ON A
CONS TRUCTI0N SITE TO REDUCE THE AMOUNT OF MUD TRANSPORTED ONTO PAVED PUBLIC ROADS BY MOTOR VEHICLES OR RUNOFF.
CONSTRUCRON ENTRANCES 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 CONSIS77NG OF A SYN7HET7C FILTER FABRIC STRETCHED ACROSS AND ATTACHED TO SUPPOR77NG POSTS AND
ENTRENCHED, TO INTERCEPT AND DETAIN SMALL AMOUNTS OF SEDIMENT FROM DISTURBED AREAS DURING CONSTRUCTION OPERATIONS IN ORDER
TO PREVENT SEDIMENT FROM LEAVING 774E 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 WI774 MINIMAL GRADES TO FILTER SEDIMENT LADEN RUNOFF
FROM SHEET FLOW AS INDICATED. 774EY SHALL BE INSPECTED IMMEDIATELY AFTER EACH RAINFALL AND MAINTAINED IN ACCORDANCE WITH 774E
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 STABILIZA7ON OF THE DISTURBED AREA. INLET PROTEC77ON APPLIES WHERE
STORM DRAIN INLETS ARE TO BE MADE OPERA77ONAL BEFORE PERMANENT STABILIZA7ON OF THE CORRESPONDING DISTURBED DRAINAGE AREA.
JOB 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 STABILIZA7ON OF 774E DISTURBED AREA. INLET PROTEC77ON APPLIES WHERE STORM CULVERTS ARE EXIS77NG
OR TO BE MADE OPERA77ONAL BEFORE PERMANENT STABILIZA7ON 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 CONSTRUCTNN. 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 SUPPOR77NG 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 ELEVA77ON MAY DAMAGE PROPERTY, CAUSE EROSION, OR INTERFERE WITH THE ESTABLISHMENT OF VEGETA77ON 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 CONSTRUC7ING AN EARTHEN EMBANKMENT WW7H 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 CONTRIBURNG DRAINAGE AREA IS LESS THAN 3 ACRES, WHERE 774E SEDIMENT TRAP WILL BE USED NO LONGER THAN
18 MONTHS, AND IT MAY BE CONSTRUCTED EITHER INDEPENDENTLY OR IN CONJUNC77ON 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 7HE MAJORITY OF THE SEDIMENT TO SETTLE OUT. APPLIES BELOW DISTURBED AREAS WHERE THE TOTAL CONTRIBU77NG
DRAINAGE AREA IS EQUAL TO OR GREATER THAN THREE ACRES THERE MUST BE SUFFICIENT SPACE AND APPROPRIATE TOPOGRAPHY FOR THE
CONSTRUCTNN OF A TEMPORARY IMPOUNDMENT.
3.18 OUTLET PROTECTION:
STRUCTURALLY LINED APRONS OR OTHER ACCEPTABLE ENERGY DISSIPA77NG DEVICES PLACED AT THE OUTLETS OF PIPES OR PAVED CHANNEL
SECTONS. TO PREVENT SCOUR AT STORMWATER OUTLETS, TO PR07ECT THE OUTLET STRUCTURE, AND TO MINIMIZE THE POTEN77AL 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
PR07ECT THE SOIL FROM THE EROSIVE FORCES OF CONCENTRATED RUNOFF, SLOW THE VELOCITY OF CONCENTRATED RUNOFF WHILE ENHANCING
THE P07ENTIAL FOR INFILTRATION, AND TO STABILIZE SLOPES WITH SEEPAGE PROBLEMS, AND/OR NON -COHESIVE SOILS. USE WHEREVER SOIL
AND WATER INTERFACE AND THE SOIL CONDIRONS, WATER TURBULENCE AND VELOCITY, EXPECTED VEGETA77VE COVER, ETC., ARE SUCH 7HAT
7HE SOIL MAY ERODE UNDER 7HE DESIGN FLOW CONDI77ONS.
3.20 ROCK CHECK DAMS.
SMALL TEMPORARY STONE DAMS CONSTRUCTED ACROSS A SWALE OR DRAINAGE DITCH. TO REDUCE 7HE VELOCITY OF CONCENTRATED
STORMWATER FLOWS, THEREBY REDUCING EROSION OF THE SWALE OR DITCH. TVIS PRACTICE ALSO TRAPS SEDIMENT GENERATED FROM
ADJACENT AREAS OR THE DITCH ITSELF, MAINLY BY PONDING OF THE STORMW47ER RUNOFF. THIS PRACTICE, UTILIZING A COMBINA77ON OF
STONE SIZES, lS 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 SEDIMENTA77ON 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
PROTEC77ON TO BARE SOILS EXPOSED DURING CONSTRUC77ON UNTIL PERMANENT VEGETATION OR OTHER EROSION CONTROL MEASURES CAN BE
ESTABLISHED.
332 PERMANENT STABILIZATION:
THE ESTABLISHMENT OF PERENNIAL VEGETA77VE COVER ON DISTURBED AREAS BY PLAN77NG 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 COMPLE77ON OF CONSTRUCTION ACTIVITIES, ALL AREAS WILL RECEIVE A PERMANENT VEGETA77VE COVER.
3.35 MULCHING:
APPLICA77ON OF PLANT RESIDUES OR 07HER SUITABLE MATERIALS TO THE SOIL SURFACE. TO PREVENT EROSION BY PROTEC77NG THE SOIL
SURFACE FROM RAINDROP IMPACT AND REDUCING 7HE 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 PLAN77NGS OF TREES, SHRUBS, OR CERTAIN GROUND COVERS WHICH DO NOT
PROVIDE ADEQUATE SOIL STABILIZAT70N BY THEMSELVES, CAN BE USED IN CON✓UNCT70N WITH TEMPORARY SEEDING.
3.37 TREES. SHRUBS. VINES & GROUND COVERS:
STABILIZING DISTURBED AREAS BY ESTABLISHING VEGETA77VE COVER WITH TREES, SHRUBS, VINES, OR GROUND COVERS. TO AID IN STABILIZING
SOIL IN AREAS WHERE VEGETATION OVER THAN TURF /S PREFERRED, TO PROVIDE FOOD AND SHELTER FOR WILDLIFE WHERE WILDLIFE HABITAT /S
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 MATT7NG.
INSTALLATION OF A PR07ECTIVE COVERING OR A SOIL STABILIZATION MAT ON A PREPARED PLAN77NG AREA OF A STEEP SLOPE OR CHANNEL TO
AID IN THE CONTROLLING EROSION ON CRI77CAL AREAS.
3.38 TREE PRESET VA77ON AND PROTECTION:
PROTECTION OF DESIRABLE TREES FROM MECHANICAL OR 07HER INJURY DURING LAND DISTURBING AND CONSTRUC77ON AC77WTY. TO ENSURE
7HE SURVIVAL OF DESIRABLE TREES WHERE 7HEY WILL BE EFFEC77VE FOR EROSION AND SEDIMENT CONTROL WATERSHED PROTFC770N
LANDSCAPE BEAUTIFICATION, DUST AND POLLU77ON CONTROL, NOISE REDUCRON, SHADE AND OTHER ENVIRONMENTAL BENEFITS WHILE THE LAND
IS BEING CONVERTED FROM FOREST TO URBAN -TYPE USES. APPLIES IN 7REE-INHABITED AREAS SUBJECT TO LAND DISTURBING ACTW77ES.
3.39 DUST CONTROL:
REDUCING SURFACE AND AIR MOVEMENT OF DUST DURING LAND DISTURBING DEMOLITION AND CONSTRUCTNN 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 CONSTRUC770N. MEASURES EMPLOYED SHALL BE IN ACCORDANCE WITH THE VESCH.
3.32
TABLE 332-D
SITE SPECIFIC SEEDING MIXTURES FOR PIEDMONT AREA
Total lbs.
Per Acre
Minimum Care lawn
- Commercial or Residential
175-200 lbs.
- Kentucky 31 or Turf -Type Tall Fescue
95-100%D
- Improved Perennial Ryegrass
0-5%D
- Kentucky Bluegrass
0.5%D
Hieh-Maintenance Lawn
200-250lbs.
- Kentucky 31 or Turf -Type Tall Fescue
100%D
General Slope (3:1 or less)
- Kentucky 31 Fescue
128 lbs.
- Red Top Grass
2 lbs.
- Seasonal Nurse Crop •
20 lbs.
150 lbs.
Low -Maintenance SIQpe (Steeper than 3:11
- Kentucky 31 Fescue
108 lbs.
- Red Top Grass
2 lbs.
- Seasonal Nurse Crop*
20 lbs.
- Crownvetch "
20 lbs.
150 lbs.
' Use seasonal nurse crop in accordance with seeding dates as stated below:
February 16th through April ......................
Annual Rye
May 1st through August 15tb .....................
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 30lbs./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.
TABLE 331-A
LIMING REQUIREMENTS
FOR TEMPORARY SITES
Recommended Application
fig( of ARrimItural Limestone
below 4.2 3 cola per acre
41 to 5.2 2 tom per acre
52 to 6 1 too per acre
TABLE MUD
ACCRPI'ARLE TEMPORARY SEEDING PIAN'I' MATERIALS
-QUICK REFERENCE FOR ALL REGIONS'
Ra.
1`1 m,e Dates S.dsl nhL(,)
Sept 1 - Feb. 6 5D/50 Mix d
An uam myugra
tint ult-nmuml
& 50-100
Cad (Wmler) Rye
Feb. 16-Apt 30 Armaal Ryegraa W_ 10)
(hlium multi-Mmml
May 1- Aug 31 German Millet 50
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 COMPLETION
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 VEGETATIVE AND STRUCTURAL EROSION
AND SEDIMENT CONTROL PRACTICES WILL BE CONSTRUCTED AND MAINTAINED
ACCORDING TO MINIMUM STANDARDS AND SPECIFICAT70NS OF THE VIRGINIA
EROSION AND SEDIMENT CONTROL HANDBOOK AND WRGINIA 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-CONSTRUCT70N CONFERENCE, ONE WEEK PRIOR TO THE COMMENCEMENT
OF LAND DISTURBING AC77VITY, 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 SITE AT ALL TIMES.
ES-5.-PRIOR TO COMMENCING LAND DISTURBING ACTIVITIES IN AREAS OTHER THAN
INDICATED ON THESE PLANS (INCLUDING BUT NOT LIMITED TO, OFF -SITE
BORROW OR 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
SEDIMENTAT70N 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 DEWA7ERING 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 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 liance with section 13-301 of the Code of
P
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
Pe
stormwater management facilities where applicable all erosion control measures required
g PP q
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.
Alternative, are subject to approved by the County erosion control inspector.
18. Permanent stabilization shall be litre and fertilizer, permanent seeding, and mulch.
Agricultural grade limestone shall be applied at 90lbs/1000sf, incorporated into the top 4-6
inches of soil. Fertilizer shall be applied at 1000lbs/acre and consist of a 10-20-10 nutrient
mix. Permanent seeding shall be applied at 180lbs/acre and consist of 95%G Kentucky 31 or
Tall Fescue and 0-5% Perennial Ryegrass or Kentucky Bluegrass. Straw mulch is to be
lied at SO1bs1100sf. Alternatives are subject to roved b the Count erosion control
applied J approved 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 he 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-
207B)
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 3.31B 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 liINCHES DEEP. SMALL SEEDS, SUCH AS KENTUCKY BLUEGRASS, SHOULD BE PLANTED NO
MORE THAN JINCH DEEP. OTHER GRASSES AND LEGUMES SHOULD BE PLANTED FROM }INCH TO J 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:
PURPOSE:
T
THE PURPOSE 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
M
MAT IAS,
6. ONCE ALL THE PHASE I EROSION CONTROL ITEMS HAVE BEEN INSTALLED AS SHOWN ON THE EROSION CONTROL PHASE I
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
PHASE II (BUILDING OF PAVILION IV):
AIRBORNE SUBSTANCES WHICH MAY PRESENT HEALTH HAZARDS, TRAFFIC SAFETY PROBLEMS OR HARM ANIMAL OR PLANT
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 UVE 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 TEMPORARY SOIL STABILIZATION SHALL BE APPLIED 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
A IL
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
13. 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
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-MINNIEVILLE LOAM-2% TO 7% SLOPES. THESE DEEP, WELL DRAINED SOILS ARE FOUND ON GENTLY SLOPING TO STEEP
CONTROL MEASURES TO BE INEFFECTIVE.
HILLSLOPES. MODERATE RUNOFF, WITH MODERATE PERMEABILITY.
SAFETY FENCE:
A PROTECTIVE BARRIER INSTALLED TO PROHIBIT UNDESIRABLE USE OF AN EROSION CONTROL MEASURE.
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 PERMEABIUTY.
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 - ERNS 5311 CONSERVAT70N 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 KILL BE CHECKED REGULARLY TO SEE THAT A GOOD STAND IS
MAINTAINED. AREAS SHOULD BE FERTILIZED AND RESEEDED AS NEEDED.
STORMWATER 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
OUTLET PROTECTION SIZING
TYPE
LENGTH
WIDTH
DEPTH
OP1
VDOT CLASS 1 A
18'
3'
1.5'
OP2
VDOT CLASS 1 A
4'
2.5'
1.5'
OP3
VDOT CLASS 1 A
9'
10'
1.5'
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SHEET NO.
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Pa,ed ron.trurlIon enIrincc for ervl%ion control plan% SC OTT R. LL1NS'Z
1992 3.01 1992 3.05 1992 3.05 1992 3.07 O� Lic. No. 035791
SAFETY FENCE "STRDG °" o MIN. 10 9/16/20
+•: :ESS 3- SM-2A ASPHALT TOP ��
COURSE EXISTING CONSTRUCTION OF A SILT FENCE CONSTRUCTION OF A SILT FENCE GRAVEL CURB INLET SEDIMENT
2� 2x PAVEMENT SIONAL V,
:, -, �3 ) [ (WITH WIRE SUPPORT) (WITHOUT WIRE SUPPORT)
Nis r�� FILTER
.. O ,. BASE 1. SET POSTS AND EXCAVATE A 4"%4" 2. STAPLE WIRE FENCING TO THE POSTS. 1. SET THE STAKES. 2. EXCAVATE A 4'"X 4" TRENCH
■��. ■ TRENCH UPSLOPE ALONG THE LINE UPSLOPE ALONG THE LINE OF
,r. ..
PROFILE of Posrs. STAKES. ��f��
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son on 6'MAX. `-J
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,.. ArCESRUCTION ASPIi/yT PAVED
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FLOW - I I II �II III I TO STAKES AND EXTEND THE EXCAVATED SOIL. V/� ) u U1
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a I
12' MIN. " sDRAINAGE O
SEDIMENTTO NAGE GRAVEL FILTER 127 O p f
(RAPPING DEVICE
PERSPECTIVE VIEW t 3- ATTACH THE FILTER FABRIC TO THE WIRE 4. BACKFILL AND COMPACT THE p RUNOFF WATER WIRE MESH ZO
FENCE AND EXTEND IT INTO THE TRENCH. EXCAVATED SOIL. I ,<' O
/ FILTERED WATER Uf) U_
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vtl.* . 4. Irk `�<r.tW ^_ IIII ^ : w +.•. de 1-
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alI 110\ql Kelllnl'3 .11 e> 1" Ig11VYe r<lhlllgll All /e,inllcul Mall be pl C\glled how Q / -
;�,� eutemn slmweh auc �luches oc wMgcowse> � ///� � _ -_
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SPECIFIC APPLICATION
5' MIN.minonwxu
FILTER FABRIC + (' " +r` i I �� ' THIS METHOD OF INLET PROTECTION IS APPLICABLE AT CURB INLETS w N
PERSPECTIVE VIEW PERSPECTIVE VIEW ����� _ _ �� WHERE PONDING IN FRONT OF THE STRUCTURE IS NOT LIKELY TO CAUSE F
PLASTIC FENCE METAL FENCE INCONVENIENCE OR DAMAGE TO ADJACENT STRUCTURES AND UNPROTECTED 0
AREAS. rn
III IIII I WIRE I I POINTS A SHOULD BE HIGHER THAN POINT B.
LL ll.w.l-- 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
0
1992 3.11 1992 3.18 1�_ a-
1992 3.07 1992 3.36 1992 3.38 co
C6
SILT FENCE DROP INLET TEMPORARY RIGHT-OF-WAY PIPE OUTLET CONDITIONS TYPICAL ORIENTATION OF FENCING AND ARMORING N
PROTECTION DIVERSIONS A A TREATMENT - > - c j
2 X 4' WOOD FRAME WITH GRATE VDOT N 1 (SOIL STABILIZATION BLANKET) /
DROP INLET
SHALLOW(J/ -
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SLOPE
1.5' MAX.
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T MAY BE APPLIED ACROSS w
AREA WITH NO DEFINED t, NETTING PROTECTIVE COVERINGS DRIP UNE_ I N J
(\' I CHANNEL �I .y' THE SLOPE. I-1
3' MIN. J �PLAN VIEW I W > Q Q
FENCE
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EXCESS g' MINIMUM L a BERM I / I J 7 Q
AT CORNERS WHERE THERE IS A BERM AT THE TOP OF THE SLOPE, L
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d BEHIND THE BERM. o
PERSPECTIVE VIEWS �„ '" I LU Q
TYPICAL GRAVEL STRUCTURE SECTION A -A FILTER CLOTH KEY IN a"-B'; RECOMMENDED FOR ENTIRE PERIMETER SSTEEPLOPE I I- Z
7 O
STAKE BOARD FENCE irtTM O Z
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-> PROTECTIVE COVERING PARALLEL 0 J
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ELEVATION OF STAKE AND TERMINATING THE INSTALLATION. TURN THE END
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SPECIFIC APPLICATION g' MINIMUM d IN DITCHES, APPLY PROTECTIVE COVERING
SECTION A -A PARALLEL TO THE DIRECTION OF FLOW. ' ' I o
THIS METHOD OF INLET PROTECTION IS APPLICABLE WHERE THE USE CHECK SLOTS As REQUIRED. AVOID LLJ
FILTER CLOTH KEY IN 6"-B"; RECOMMENDED FOR ENTIRE PERIMETER - JOINING MATERIAL IN THE CENTER OF +EAYI ! f1
INLET DRAINS A RELATIVELY FLAT AREA (SLOPE NO GREATER THE DITCH IF AT ALL POSSIBLE. wt / ` - ,hew LIJ
NOTES: 1. APRON LINING MAY BE RIPRAP, GROUTED RIPRAP, GABION iA4w
THAN 5%) WHERE THE INLET SHEET OR OVERLAND FLOWS (NOT BASKET, OR CONCRETE. rRNM � LU
EXCEEDING 1 C.F.S.) ARE TYPICAL. THE METHOD SHALL NOT TYPICAL EARTHEN STRUCTURE 2. La IS THE LENGTH OF THE RIPRAP APRON AS CALCULATED r CORRECT TRUNK ARMORING
APPLY TO INLETS RECEIVING CONCENTRATED FLOWS, SUCH AS USING PLATES 3.18-3 AND 3.18-4. wlM U)
IN STREET OR HIGHWAY MEDIANS. 3. d = 1.5 TIMES THE MAXIMUM STONE DIAMETER. BUT NOT
LESS THAN 6 INCHES. TRIANGULAR BOARD FENCE LU
Source: N.C. Erosion and Sediment Control Source: Va. DSWC Plate 3.11-1 LLI
Source: Va. DSWC Plate 3.18-1 Source: Va. DSWC Plate 3.38-2 Planning and Design Manual, 1988 Plate 3.07-1 Source: Adapted from Ludlow Products Brochure Plate 3.36-1 � co
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-Flow 202187
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4.5' min. SHEET NO.
I 4
EROSION CONTROL * ORGINIA EROSION & SEDIMENT CONTROL L
000
HANDBOOK SPECIFICAAON NUMBER - \
CONTRACTOR STAGING AREA I pyTH Oj
SA SAFETY FENCE 3.01 I WITH FUELING TANK, DUMPSTER,
AND PORTA-POTTIES
♦♦ �SCOTT R. LLINS'Z
CE CONSTRUCTION ENTRANCE 3.02 SOIL I PROPOSED SAFETY \ ,
I
CR CR CONSTRUCTION ROAD STABILIZATION 3.03 TYPE I FENCEAROUN \ �♦ U Lic. No. 035791,E
1 B SEDIMENT TRAP IP ♦ ♦ �� 9/16/20 r4
SF KIP SIL T FENCE 3.05 II r - o x�y ♦ ♦� ❑� o
/ ♦ ♦ ♦ OIL SSJONAL V,
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DD -� TEMPORARY DIVERSION DIKE 3.09 ❑ I I 3 6 Q y%I A 1
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RW � TEMPORARY ROW DIVERSION 3.11 DID I A ❑ T-
ST SEDIMENT TRAP 3.13 \ / I \
� <----- -- � 560.63 m
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TS TS TEMPORARY SEEDING 3.31 \ - ❑❑ ❑ X ( I m z
PS PS PERMANENT SEEDING 3.32 ❑�
TREE PROTECTON 3.38 �) NOTE: SILT FENCE, SAFETY FENCE,AND ND� I�On
TREE PROTECTION SHALL BE INSTALLED L ❑ R I I m
DC DC DUST CONTROL 3.39 AT LIMITS OF DISTURBANCE. THESE ARE ` _ SOIL TYPE BOUNDARY (TYP. D I W
OFFSET FOR GRAPHICAL PURPOSES.
❑'
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.... DRAINAGE DIVIDES ARE MEASURED AT THE i �
BM SOIL STAB/L/ZATON BLANKET J. m mmmm
\ LIMITS OF DISTURBANCE OR DIVERSION j �c x-� x Xx
\ DIKE. x-xtxx-x- x-i�x x�c�
\ I
I
\ /❑ 12'x7o' MIN.
SAF SAF SF CE NOTE: THIS CONSTRUCTION ENTRANCE SHALL BE
❑ \ I ❑ ❑ - _ _ _ - - - _ INSTALLED, OPERATED, AND MAINTAINED BY THE o
�/❑ _ W/ WIRE CONTRACTOR. ALL CONSTRUCTION TRAFFIC IN THIS F
-- - - -
SF - _zq
• ❑ \ \ ❑ _ __ _ _ _ _ SUPPORT AREA SHALL UTILIZE THIS CONSTRUCTION ENTRANCE.
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PROPOSED SAFETY FENCE LU L/ / O
AROUND SEDIMENT TRAP U
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AROUNDSEDIMENTTRAP - o i , / LU DOTE: THIS CONSTRUCTION ENTRANCE SHALL BE / ❑ LU Q
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:STALLED, OPERATED, AND MAINTAINED IC THE LIMITS OF DISTURBANCE (TYP.) - _ , J / ❑ ' ^ LU
kREASHALL U ALL CONSTRUCTION TRAFFIC IN THIS ❑ ❑ \ \ \ - ` , \ ❑ V ,
AREA SHALL UTILIZE THIS CONSTRUCTION ENTRANCE. � � � � � ~ w
ROSSER ASSOCIATES ' - ' - - �! - - ❑ J W �O
Sediment Trap design#1 FFICE -� TP
Sediment Trap design #2 5 Sediment Trap design #3 ❑�
drainage area (acres) (< 2 ac) 0.58 °"R N / J Q O
drainage area acres < 2 ac 0.5 °AR By
I ,� WRHHLE �
trap volumes: DRIGE+"L CREST OF STONE WEIR • 9 (acres) ( ) � I drainage area (acres) (< 2 ac) 0.65 _ _ Ur �
elevation (ft) area (sf) wlume(cf) volume(cy) [ OLNU - trap volumes: �� CREST OF STONE WEIR ,, trap volumes: ORVINIIi,CREST OF STONE WEIR -%WE• / O W
587.00 256.0 0 0.0 elevation 99 area229 wlume(co wlume(c0yo GROUND a OOR0 NO D O W
ELN. � elevation (ft) area (sf) wlume(cf) volume(cy) \ '
587.00 256.0 484 10.0 ORYSTORAGE - MBE - 585 426 0 0.0 y -
N
600 739 460 17.0 DRY STORAGE a N VARWAE 586 836 620 22.9 DRYSTORAGE - N VARIABLE / BO�q_ fry
589.00 1018.0 1,368 50.7 r 601 1341 1,485 55.0 587 1335 1,695 62.8 T
590.00 1309.0 2,528 93.6 602 1967 3,129 115.9 ry 2 u
WET STORAGE 588 2518 3,303 203.3
O O O 0.0 (IXCAVAIED) a wz O O O O.O WET STORAGE >
nEDR CLOTH o I"L a. ", _ 589 2518 5,503 203.8 WET STORAGE
ILEV. E%GVATm) [LN FLTER CLOTH GRaNO - l ,-- W
GROLIND ( FILTER CLOTH DRIGIN"L (ExmATEm)
GROUND
EIEV. / _ - Q _
.SEE PIATE �.1J-1 CO"16E AGGREGATE CLASS I RPRAP ` \ �
wet storage: wet storage: SEE RUTE O.i3-, COMM AGGREGATE CUSS I RFRAP wet storage: SEE P TE 11-1 CO E AGGREG n CLASS I RIPRAP / / C1. Ln
wet storage required (cy) (67*DA) 38.9 wet storage required (cy) (67*DA) 33.5 wet storage required (cy) (67*DA) 43.6 , JOB NO.
bottom of stone weir (ft) 588.64 bottom of stone weir (ft) 600.43 bottom of stone weir (ft) 587.53 - ' - - - 202187
wet storage provided at this elevation (cy) 38.9 wet storage provided at this elevation (cy) 33.5 wet storage provided at this elevation (cy) 43.6 / ' GRAPHIC S ALE
slope of wet storage sides 2:1 slope of wet storage sides 2:1 slope of wet storage sides 3:1 _ /' zo 0 10 SCALE
weir length (ft) (6xDA) 3.5 weir length (ft) (6xDA) 3.0 weir length (ft) (6xDA) 3.9 1 ao eo
dry storage: bottom of trap elevation (ft) 587.00 dry storage: bottom of trap elevation (ft) 599 dry storage: bottom of trap elevation (ft) 585 /
1 "=20'
dry storage required (cy) (67*DA) 38.9 bottom trap dimensions: 13'X40' dry storage required (cy) (67*DA) 33.5 bottom trap dimensions: 4'1 dry storage required (cy) (67*DA) 43.6 bottom trap dimensions: 15'X48'
crest of stone weir 589.63 top of dam elevation (ft) 590.63 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 ( IN FE T) SHEET NO.
dry storage provided at this elevation (cy) 38.9 top width of dam (ft) 6' 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' 1 inch = 20 ft. 5slope of dry storage sides 2:1 top trap dimensions 25'x53' I Islope of dry storage sides 2:1 top trap dimensions 15'x144' I Islope of dry storage sides 3:1 top trap dimensions 47'X88'
EROSION CONTROL * HANDBIOOKROSION ICA SEDIMENT
7ROL
NUMBER � -
i
CONTRACTOR STAGING AREA �, pyTH OFF
MPSTER
SA SAFETY FENCE 3.01 II WITH FUELINGAND PORTDA POTT ES X
CE CONSTRUCTION ENTRANCE 3.02 PROPOSED SAFETY ` O
\ \ , �� SCOTT R. LLINSZ
CR CR CONSTRUCTION ROAD STABILIZATION 3.03 -- -- FENCE AROLIN _ \ U Lic. No. 035791
SEDIMENT TRAP �� IP" //x , .�• �;, 9/16/20 cQ
SF # SILT FENCE 3.05 r i X X '� . \ 0
lP STORM DRAIN INLET PROTECTION 3.07
DD �� TEMPORARY DIVERSION DIKE 3.09 x�X X X A >
RWI TEMPORARY ROW DIVERSION 3.11 1 1 DD \ _
ST SEDIMENT TRAP 3.13 \ / III / \\ Z 1
_ _ J CP \ m
SB SEDIMENT BASIN 3.14 - -�--------- / ST1 \
OP OUTLET PROTECTION 3.18 / V
\ \ � m L
P \ \.. m
OF DAM
RR RIPRAP 3.19
z
CD _ UTILITY STREAM CROSING 3.25 _ - - - - - - - 590.fi3 I CONCRETE WASH OUT AREA v L
--------- i' = Z Lu c
- m >�
Z
O �/ TEMPORARY SEEDING 3.31 \ ,� m O Z
�U
------------------- /!�' > L
PS PS PERMANENT SEEDING 3.32 \ • �� I \ -
l\
Ic
TREE PROTECTION 3.38 I � �------ _ _
NOTE: SILT FENCE, SAFETY FENCE, AND- s i
ODC DC DUST CONTROL 3.39 \ \ TREE PROTECTION SHALL BE INSTALLED 7 . % W
AT LIMITS OF DISTURBANCE. THESE ARE - �I DD II
OFFSET FOR GRAPHICAL PURPOSES. - w I j O I li
BM SOIL STABILIZAT70N BLANKET 3.36
\ DRAINAGE DIVIDES ARE MEASURED AT THE II '
\ LIMITS OF DISTURBANCE OR DIVERSION Xxxx�xxxx x-xxx-
A DIKE. - -
L i2'x7O' MIN.
CE
\ SAF SF NOTE: THIS CONSTRUCTION E TRANCE SHALL BE
\ - - - - - _ _ _ _ - - INSTALLED, OPERATED, AND MAINTAINED BYTHE CD
SF _ --- _- _
W/ WIRE
SAF
/ _ _
\ \ _ _ _ _ _ _ _ SUPPORT AREARL UTILIZE TOHIS CONSTRUCTION ENTRANCE.
W/WIRE
TP \ \ SUPPORT-- /
\ - �.
- I
_ --
t
SF 1 ' �cX� jig a���
W/ WIRE �� - -- - -- ' ; x X xy
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i/ /
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DA TO ST i = 0.58 AC (N
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I DA TO ST 2 = 0.5o AC 1
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333 1 / �/ J Z J
DC DC DRAINAGE DIVIDE (TYP.) 1 (PHASE i� 1 / / / _ LU
I DA TO ST3 - 0-6 ;
- ' ii/ U
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WASH OUT AREA V /
Z �'� / i 1� �� �'® W/WIRE Z
/ Q
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/ I / LU p �•r •',.• � l / r - -. _ 91 i i _ i / / / 1- oi.00 - - - - - - - - �0>-
• j F - ---'- = - - - - -- - - - - - - - - --
602.42 ^ fi• 602A2 _ /
\ DD PS ♦ 6 TRAM PROPOSED SAFETY FENCE LLJ V / z
- - - '
■�xl�®x xaama� a�a����� la�lwlt► x x \ -- -- ✓/ i ♦ - -- _ --- - 9F /
X J ' _ - _ AROUND SEDIMENT TRAP
d" Q
x-x-x-x-x-x-x-x-x-x-x--x-x-x-x-x-x-x-x- -x-x--x-x-x-x-x-x-x-x-x-x-x-x-xJ �x-x-x-x-x-x-x-x-x-x x-x-x-x-x-x-x-xxxxxxxxxxxxxx-xx-xx-xx-xx-xx-xx-xx- x=s�z xz xx xxx- _ _ _ _ _ _ _ _ - -x-x- ()
TH
Ul
TP PROPOSED SAFETY FENCE - _ - _ - - i I _ - -
t '
JO E: MIN. - - - - - - _ TP / i I SAF o�G / PS / �
AROUND SEDIMENT TRAP - - - � � � _ �oG
JOTS: THIS CONSTRUCTION ENTRANCE SHALL BE W
VSTALLED, OPERATED, AND MAINTAINED BYTHE LIMITS OF DISTURBANCE (TYP.) - - - _
ONTRACTOR. ALL CONSTRUCTION TRAFFIC IN THIS - \ _ _ - - , J ' ^ LU REA SHALL UTILIZE THIS CONSTRUCTION ENTRANCE. - ~ w O)
ROBBER ASSOCIATES ����` �' ,'� _ - 1--
J Z
Sediment Trap design #1 EEICE - / TP CO Q
Sediment Trap design #2 5 Sediment Trap design #3 � Q
drainage area (acres) (< 2 ac) 0.58 ,• VARIABLEtrap volumes:ORP(HNL CREST of sroxE WEIR •,� A6 E• drainage area (acres) (< 2 ac) 0.5 °ARC drainage area (acres) (< 2 ac) 0.65 / < ( 1� Q�,
�J r vuuatE (D V
elevation (ft) area (sf) volume(cf) volume(cy) � ND \ trap volumes: CREST OF STORE WEIR I I - I trap volumes: CREST of STORE WEIR yyy,SLE• / 599 229 0 0.0 585 426 0 00 O O
y o elevation (ft) area (sf) volume(cf) volume(cy) DORCUND eleva) ae( tion (it) (sf) ,olumcf) volume(cy) lumGROUND LU LU
587.00 256.0 0 0.0 - O
588.00 756.0 484 17.9 DRYSTORAGE - p vwaF 0
.''p
589.00 1018.0 1,368 50.7 VARI ELE• 586 836 620 22.9 N
600 739 460 17.0
DRY STORAGE p+. DRY STORAGE
601 1341 1,485 55.0 587 1335 1,695 62.8 T
590.00 1309.0 2,528 93.6 N 602 1967 3,129 115.9
WET STORAGE 588 2518 3,303 203.3 /
0 0 O 0.0 (EXCAVATED) " 0 0 0 0.0 WET STORAGE '
LIER cwrR OR GNAL uz. 589 2518 5,503 203.8 WET TO �, Lux
(EXCAVATED)GPWND FILTER CLOTHGROUND (D(GMIED) FLCRICINAL
FILTER GLOTM
GROUND / W
0 CRt N W
/
EIEV ELfY. / _ W
-SEE PGTE 3.13-1 COARSE AGGRECATE'�' CIA55 I RPRAP
wet storage: wet storage: -SEE PLATE 3,13-1 COARSE AGGREWTE� CUSS I RIPRAP wet storage. SEE MATE 3.13-1 CDORSE AGGREGATE CLASS I RIPRAP f
wet storage required (cy) (67*DA) 38.9 wet storage required (cy) (67*DA) 33.5 wet storage required (cy) (67*DA) 43.6 , // JOB NO.
bottom of stone weir (ft) 588.64 bottom of stone weir (ft) 600.43 bottom of stone weir (ft) 587.53 202187wet storage provided at this elevation (cy) 38.9 wet storage proVded at this elevation (cy) 33.5 wet storage provided at this elevation (cy) 43.6 / / GRAPHIC s ALE
slope of wet storage sides 2:1 slope of wet storage sides 2:1 slope of wet storage sides 3:1 _ /' SCALE
weir length (ft) (6xDA) 3.5 weir length (ft) (6xDA) 3.0 weir length (ft) (6xDA) 3.9 20 0 10 zo 40 eo
dry storage: bottom of trap elevotion (ft) 587.00 dry storage: bottom of trap elevation (ft) 599 dry storage: bottom of trap elevation (ft) 585 /
1 "=20'
dry storage required (cy) (67*DA) 38.9 bottom trap dimensions: 13'X40' 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 589.63 top of dam elevation (ft) 590.63 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 ( IN FE T) SHEET NO.
dry storage proVded at this elevation (cy) 38.9 top width of dam (ft) 6' 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' 1 inch = 20 ft. 6
sloe of d storage sides 2:1 to trapdimensions 25'x53' slope of dry storage sides 2:1 top trap dimensions 15'x144' slope of dry storage sides 3:1 top trap dimensions 47'X88'
11ROIION 8, SEDIMENT CON
OS
EROSION CONTROL * HANDBIOOKRSPECIFICATION NUMBER 7ROL
� I
SA SAFETY FENCE 3.01
I
- I
CE CONSTRUCTION ENTRANCE 3.02
CR CR CONSTRUCTION ROAD STABILIZA11ON 3.03
--II
SF K X SILT FENCE 3.05 _
I lP STORM DRAIN INLET PROTECTION 3.07 \ I I I I
DD -1111- TEMPORARY DIVERSION DIKE 3.09
I I _
J L -I-
RW � TEMPORARY ROW DIVERSION 3.11
ST SEDIMENT TRAP 3.13 %
SB SEDIMENT BASIN 3.14
OP OUTLET PROTECTON 3.18
RR RIPRAP 3.19
U77LITY STREAM CROSING 3.25 - - - - - - -
O---�- TEMPORARY SEEDING 3.31
PS PS PERMANENT SEEDING 3.32
O1 TREE PROTECTON 3.38
NOTE: SILT FENCE, SAFETY FENCE, AND
DC DC DUST CONTROL 3.39 ( TREE PROTECTION SHALL BE INSTALLED i I
AT LIMITS OF DISTURBANCE. THESE ARE
BM SOIL STABILIZATION BLANKET 3.36 \ OFFSET FOR GRAPHICAL PURPOSES.
DRAINAGE DIVIDES ARE MEASURED AT THE �y
\ LIMITS OF DISTURBANCE OR DIVERSION
A DIKE.
\ CONTRACTOR STAGING AREA pyTH O
\ \/ WITH FUELING TANK, DUMPSTER, F
\ AND PORTA-POTTIES p l�
G1
PROPOSED SAFETY
�� \V �X!X ♦� SCOTT R. LLINSZ
FENCE AROUND _ \ \ fix' U Lic. No. 035791,E
SEDIMENT TRAP \ IP -010� 9/16/20 c4
/ / �, i / V ♦ I, TONAL V,
\ ny >
Uj
Y�
� O I r
�m w
590.63 STi \\ y-
mLu
6'TOP \ �/ P \ z
y OF DAM \ -A
II ➢-A� I O w
F
CONCRETE WASH OUT AREA �, VrA /
/ 590.63 I O
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16 W-INip�������������
N.
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SAF � SAF SF
- - -
-----_-- J-- ---- - - - -- _ - - - -
--
W/ WIRE INSTALLED, OPERATED, AND MAINTAINED BY THE
-
CD
\ - -- THIS
-
\ SUPPORT AREA L UTILIZE THIS CONSTRUCTION NCONTRACTOR. ALL CNSTRUCTION TRAFFICITRANCE. o �°
--- _
W/ WIRE - - IP rn
TP \ \\may SUPPORT
FEE
+\ \ \
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SF
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. 5
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DID
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M PARKING LEVEL FFE-6o / / �� -j Z J
(PHASE 2) 1 / / / �..�
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WASH OUT AREA DA TO ST � � � \ � � 1 3 97 AC /� � , SF � < Q
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r1l I 1/ // ,` // SUPPORT O 0O z Q
m 1 / / /v
♦ + 1 J Q Z
Q J Q
= "MmL���
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-x-x-x-x-x- x- x-x-x-x-x-x-x-x-x-x-x--x-x-x-x-x-x-x-x--x-x--x-x-x-x-x-x-x-x-x-x-x-x-x k-x-x x-x-x-x- x- x- ) ix x x x x---x-x- x�-x-x------x-x-x� r�x z-x-x-x-x-x -- x x x x x� -x-x x-x-x-x-x-x-x-x-x-x-x� � x x-x-x-x-x- x-x-x-x-x-x-x-x - x " - o
- YY - ' o - - Ul
12'
x o MIN. _ - _ _
- - - - - - - - - - - - TP / - - - - t - - - PS w
��
- - �� -- _,SAF �� �o i
-----J �\ / /
JOTE: THIS CONSTRUCTION ENTRANCE SHALL BE / `
LIMITS OF DISTURBANCE (TYP.) - - - / - - /X
VSTALLED, OPERATED, AND MAINTAINED BY THE � (Q) �
V / (n
ONTRACTOR. ALL CONSTRUCTION TRAFFIC IN THIS -
_j: cZ
iREA SHALL UTILIZE THIS CONSTRUCTION ENTRANCE. - �\ � � � � � ~ w
ROSSER ASSOCIATES ��� - LU Z
Sediment Trap design#1 'ONING: CO COMMERCIAL OFFICE - TP m O
TAX MAP 60 PARCEL 25 Sediment Trap design#3 Q I --I
drainage area (acres) (< 2 ac) 0.58 '' """ USE: OFFICE 1, YARIABIF < /
`
trap volumes: o IMAL CREST OF STONE WEIR AR �• drainage area (acres) (< 2 ac) 0.97 .J
elevation (ft) area (sf) wlume(cf) volume(cy) GROUND trap wlUmeS: CREST OF STONE WEIR yARUS E /
587.00 256.0 0 0.0 `
-
elevation (ft) area (sf) wlume(cf) volume(cy) c OU"D / 0 C) w W
588.00 756.0 484 17.9 DRY STORAGE N VARIA E 565 426 0 0.0
589.00 1018.0 1,368 50.7 r 586 836 620 22.9 / eoaG- N
DRY STORAGE
567 1335 1,695 62.8 T
590.00 1309.0 2,528 93.6 588 1897 3,303 122.3 / 2
WET STORAGE
0 0 0 0.0 (E%GMIED) 589 2518 5,503 203.8 W(E=TWAGEA FLIER CLOTH AD
N
ELEY /
H
FLIER CLOTH ONCINAL
DNC1N0 - / rt W
Y. Q W
•SEE PUTE 3.1}1 COARSE AGGREGATE- CUSS I RPRAP � - C� _
wet storage: wet storage: SEE PLATE 3.13 1 CW AGGREGATE" CUSS I RFRAP CL. lLn
wet storage required (cy) (67*DA) 38.9 wet storage required (cy) (67*DA) 65.0 , / JOB NO.
bottom of stone weir (ft) 588.64 bottom of stone weir (ft) 587.04 _ - 202187
wet storage provided at this elevation Icy) 38.9 wet storage provided at this elevation (cy) 65.0 GRAPHIC S ALE
slope of wet storage sides 2:1 slope of wet storage sides 2:1 j SCALE
weir length (ft) (6xDA) 3.5 weir length (ft) (6xDA) 5.8 zo G 10 zo ao eo
dry storage: bottom of trap elevation (ft) 587.00 dry storage: bottom of trap elevation (ft) 585 /
1 11=20'
dry storage required (cy) (67*DA) 38.9 bottom trap dimensions: 13'X40' dry storage required Icy) (67*DA) 65.0 bottom trap dimensions: 15w,
crest of stone weir 589.63 top of dam elevation (ft) 590.63 crest of stone weir 588.09 top of dam elevation (ft) 590 / ( IN FE T) SHEET NO.
dry storage provided at this elevation (cy) 38.9 top width of dam (ft) 6' dry storage provided at this elevation (cy) 65.0 top width of dam (ft) 8' 1 inch = 20 ft. 7
slope of dry storage sides 2:1 top trap dimensions 25'x53' slope of dry storage sides 2:1 top trap dimensions 47'x88'
11RIGIION 8, SEDIMENT CON
OS
EROSION CONTROL * HANDBIOOKRSPECIFICATION NUMBER 7ROL
� I
SA SAFETY FENCE 3.01
- I
CE CONSTRUCTION ENTRANCE 3.02
CR CR CONSTRUCTION ROAD STABILIZA11ON 3.03
I
SF K X SILT FENCE 3.05
- -I lP STORM DRAIN INLET PROTECTION 3.07 \ F I I I I
DD TEMPORARY DIVERSION DIKE 3.09 f
I I
J L -I-
9 TEMPORARY ROW DIVERSION 3.11
ST SEDIMENT TRAP 3.13
SB SEDIMENT BASIN 3.14 1--------- /
OP OUTLET PROTECTON 3.18
NOTE: SILT FENCE, SAFETY FENCE, AND
RR RIPRAP 3.19 TREE PROTECTION SHALL BE INSTALLED /
AT LIMITS OF DISTURBANCE. THESE ARE
- - - - - OFFSET FOR GRAPHICAL PURPOSES. E
CD ,_ U77LITY STREAM CROSING 3.25 DRAINAGE DIVIDES ARE MEASURED ATTHE
LIMITS OF DISTURBANCE OR DIVERSION
TEMPORARY SEEDING 3.31 ` \ < - - -� DIKE.
PS PS PERMANENT SEEDING 3.32 i i \ ♦� • ❑� / /
O1 TREE PROTECTON 3.38
DC DC DUST CONTROL 3.39 DRAINAGE DIVIDE (TYP) ` ` i • I
BM � SOIL STABILIZATION BLANKET 3.36 \
CONTRACTOR STAGING AREA �, pyTH 0
WITH FUELING TANK, DUMPSTER,
AND PORTA-POTTIES
\ 10 SCOTT R. LLINSIZ
PROPOSED SAFETY_ \ \ �I� C)
FENCEAROUN \ \ �� U Lic. No. 035791,E
SEDIMENT TRAP e\ I . Soo Ap 9/16/20 c4 N O
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CONSTRUCTION / - ENA C- TRANCE SHALL BE
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CONTRACTOR. ALL CONSTRUCTION TRAFFIC IN THIS w I
❑ \ I }�F\ ❑ ` / - - _ _ SUPPORT AREA SHALL UTILIZE THIS CONSTRUCTION ENTRANCE. a �°
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m I I PARKING EVEL FFE=607.67 1 PARKING LEVEL FFE 607.00 1 PARKING-tEVEL FFE 603.33 1 // 1 v j I �� J J
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JOTE: THIS CONSTRUCTION ENTRANCE SHALL BE � - - � � - � _ _ �
VSTALLED, OPERATED, AND MAINTAINED BY THE LIMITS OF DISTURBANCE = 2.26 AC W
:ONTRACTOR. ALL CONSTRUCTION TRAFFIC IN THIS ❑ � W U) V)
\REA SHALLLL UTILIZE THIS CONSTRUCTION ENTRANCE. � w
ROSSER ASSOCIATES ���` - Nij W Z
Sediment Trap design #1 ZONING: CO COMMERCIAL OFFICE - TP
TAX MAP 60 PARCEL 25 ❑ Q
drainage area (acres) (< 2 ac) 0.31 '' 'VM! USE: OFFICE / I t O
trap volumes: CREST OF STONE WEIR ARA9E / �•J
elevation (ft) area (sf) volurrI wlume(cy) 0E 140 - - - _ _ / /
587.00 256.0 0 0.0 E N - °
�0 o W W
O
588.00 756.0 484 17.9 DRY STORAGE - N YARVAE / / /
/ N
589.00 1018.0 1,368 50.7
/ T
590.00 1309.0 2,528 93.6
WET STORAGE a' W.
O 0 0 0.0 (IXGVATED)
\FEiER CLOTH ORIGINALI-
GF I N0
CLEV / / - / ^ W
/ / _ - 0 W
.SEE PLATE 3.13-1 COARSE AGGREGATE CIASS I RIPiGP / - CY _
wet storage: / a 1n
wet storage required (cy) (67*DA) 20.8 / / / / ❑ JOB NO.
bottom of stone weir (ft) 588.09-
wet storage provided at this elevation (cy) 20.8 / - / ' GRAPHIC ISALE 202187
slope of wet storage sides 2:1 / SCALE
weir length (ft) (6xDA) 1.9 / / 20 a 10 20 40 80 1 "-20'
dry storage: bottom of trap elevation (ft) 587.00 /
dry storage required (cy) (67*DA) 20.8 bottom trap dimensions: 13'x40'
crest of stone weir 588.72 top of dam elevation (ft) 590.63 IN FE T) stieeT rvo.
dry storage provided at this elevation (cy) 20.8 top width of dam (ft) 6' j i i , ' '� t inch = zo It. 8
slope of dry storage sides 2:1 top trap dimensions 25'1 /
40'
PRE -DEVELOPMENT STORMWATER MANAGEMENT PLAN, SCALE 1"=50'
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SOIL �� / SOIL TYPE BOUDNARY •
TYPE LINE(TYFJ ■ \\
19B _ � ■ � \ I I �
Quo EXISTING DEV L PMENT'S i a
DRAINA W GE A q TO REMAIN R-EIRI IS -III 1.
♦ ■
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1.4 a i ♦� SUBAREA A '/ IRCRTED
CN 8
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1.70 ac.
QUb
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I
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0
PER APPROVE Tc=0.24 hrs. i
o ISDP-2007-000 �a o
SHE THER
■ I ■
■ ■ RISTIETEN
,
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SOIL ■
E ♦ TYPE
iqB
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. QUALITY CALCULATIONS
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/ \ 215' BUILDING SETBACK UNE
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- D.B. 1896-236 PLA-Tf-----�� � /7(! �
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Pre -Development Impervious Area Summary
Subarea A, Water Quantity
Building/Structure 1=213sfRoads/Driveways 3
4,574 sf
GRAPHIC SCALE
( IN FEET )
1 inch = 30 ft.
WATERSHED SUMMARY
POST -DEVELOPMENT STORMWATER MANAGEMENT PLAN, SCALE 1"=50'
I
BOCK RETAINING
ro.B.--
GENERAL SWIM FACILITY NOTES:
03e
1. CONTRACTOR SHALL CALL THE COUNTY INSPECTOR & ENGINEERING DEPARTMENT 24-HOURS BEFORE ANY ANTICIPATED CONSTRUCTION ACTIVITIES FOR THE BMPs. THIS
a
Ob0 p mo
IS INCLUSIVE OF WHEN THE UNDERGROUND DETENTION SYSTEM SUBGRADE IS READY FOR PIPE CONSTRUCTION, BUT BEFORE STONE BEDDING IS INSTALLED.
DETENTION SYSTEM W OUTFALL TO CONSIST OF Aio' WIDE, 4 LONG, 18" DEEP VDOT CL. At RIPRAP
z. PROPOSED OUTLET PROTECTION BELOW THE UNDERGROUND
UNDERLAYMENT. APRON TO BE LOCATED BETWEEN THE PROPOSED ENDWALLAND THE BASIN FLOOR, AS SHOWN. OUTLET
`
O/
HQ
LINED APRON WITH FILTER FABRIC
O THE
PROTECTIOSTRUCTURENTO EDUCE THE RISK OSHALL THEN F COOUR & ORIFICE CLOGGING FILTER FABRIC U DERLAYMEN TSHALL BE EY DBASE OF THE EMBANKMENT& SHALL EXTEND ,DETENTION
INNTO THE EXISTING NG GROUND AM INIMUM OF
E�
-" " *"
TM ,qT o .
„. rE E � d b
9" AT THE ENDS& ALONG THE PERIMETER. EDGES OF FILTER FABRIC SHALL OVERLAP A MINIMUM OF 12".
� /
"
S
ACCORDANCE WITH THE DETAILS & DESIGNS SHOWN ON THIS PLAN.
T HALL BE CONSTRUCTED IN ACCO
3 . THE DETENTION BASIN A EMBANKMENT SHALL
K OF CLOGGING
THE RISK
-..
CALCULATIONS. TO REDUCE
MINIMUM ENERGY BALANCE CA CU
4. LOW -FLOW ORIFICE DIAMETERS LESS THAN 3" ARE REQUIRED TO MEET M
-��-
=::u
�., -.,„,�E"o,,.„".,n.„��„,„"„,.,„�,."�„�
BA IN'A'RISER. ADDITIONALLY THE RIPRAP OUTLET PROTECTION BELOW UNDERGROUND
TRASH RACKS ARE PROPOSED ON ALL ORIFICES AND THE DETENTION S
� \
HIS I a "ro„�E.E�,.„..„„
� " 'M�g,
BASIN B's LOW -FLOW
DETENTION SYSTEM WAS EXTENDED (AS DESCRIBED ABOVE IN #z) A TAo4tiSLOPE TO REDUCE THE RISK OF CLOGGING DETENTION B 5
,
ORIFICE. ALSO, PRIVATE DROP INLET STIR. 41S 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.
\
J
STORMWATER MANAGEMENT NARRATIVE:
..� -
OVERVIEW
- -
- - - \ \ \
THIS PROJECT PROVIDES STORMWATER MANAGEMENT (SWIM) PRACTICES TO MITIGATE THE IMPACTS FROM THE PROPOSED IMPROVEMENTS. THIS
STORMWATER MANAGEMENT PLAN COMPLIES WITH PART IIB SWM 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
BUILDINGS ARE EVALUATED WITH THIS STORMWATER PLAN.
1
- SUBAREA B \
N
WATER QUALITY SUMMARY
II \ \ \ \
=_ 1.13 ac. I. \
THE STORMWATER QUALITY REQUIREMENTS FOR THIS DEVELOPMENT ARE MET THROUGH THE BEST MANAGEMENT PRACTICE OF PURCHASING NUTRIENT
I \ I�
CREDITS. A MINIMUM PHOSPHOROUS REMOVAL RATE OF 1.86 Ibs/yr IS REQUIRED. THE DEVELOPER WILL PURCHASE NUTRIENT CREDITS PRIOR TO THE
CN=82 I\ \ \ .' r _
ISSUANCE OF A LAND DISTURBANCE PERMIT.
Tc-0 24 h I
rS. PLEASE SEE THE ATTACHED CALCULATIONS PACKET AND THIS SHEET FOR ADDITIONAL DETAILS.
7 \ ■ �L , w ,_- � ,i (ROUTED THROUGH
- ■ DETNETION BAIN 'B') / WATER QUANTITY SUMMARY
THE PROPOSED DEVELOPMENT HAS ONE CONCENTRATED OUTFALL. ITS DRAINAGE AREA (SUBAREAS A & B) MEETS MINIMUM CHANNEL AND FLOOD
�, �I I I, PROTECTION REQUIREMENTS SET FORTH IN 9 VAC 25-870-66. SUBAREA A RECEIVES ATTENUATION VIA DRY SWALE 'A' INITIALLY, AND IS THEN
. - - I A I r DIRECTED INTO DETENTION BASIN 'B'. SUBAREA B's INFLOWS AND SUBAREA A's ROUTED OUTFLOWS WERE SYNCHRONIZED. THE SYNCHRONIZED STORM
EVENTS WERE THEN ROUTED THROUGH DETENTION BASIN 'B'. THE RESULTANT DETENTION BASIN 'B' ROUTED OUTFLOWS ARE COMPLIANT WITH
MINIMUM COUNTY & STATE REQUIREMENTS.
1 ■ • r ( \ IN SUMMARY, CHANNEL PROTECTION FOR SUBAREAS A & B IS MET THROUGH 9VAC25-870-66 SECTION B.3.a (ENERGY BALANCE) AND FLOOD
I _ ■ \ l PROTECTION IS MET THROUGH 9VAC25-870-66 SECTION C.2.b. (10yr. POST FLOW < 10 yr. PRE FLOW). COMPLIANCE WITH THESE SECTIONS IS
ACHIEVED PRIMARILY THROUGH THE PROPOSED DETENTION BASIN WAND THE PROPOSED DETENTION BASIN 'B'. PLEASE SEE THE ATTACHED
H • 0 0 0 \ \I \ CALCULATIONS PACKET AND THIS SHEET FOR ADDITIONAL DETAILS.
DETENTION BASIN'B' CONSTRUCTION NOTES:
J,ao EXISTING DF�/ L P ENT'
EH.°� p"ec DRAINAGE AIT _ FACILITY PLANTING SPECIFICATIONS:
wok H Y6�1 I UNDIST B E A C 0 0 I 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
_� _ _SIIES ""� AND IS NOT REQUIRED FROM A STORMWATER MANAGEMENT STANDPOINT. HOWEVER LANDSCAPING MAY BE PROPOSED WITHIN THE FACILITY. SEE LANDSCAPING PLAN FOR
zap 1.49 a r "I �' as�µw a`ow"o ADDITIONAL DETAILS PERTAINING TO THE SITE'S OVERALL LANDSCAPING REQUIREMENTS.
V 1 U pV
- 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
I CN 8 `• oi( I ® j \ poi? POSITIVE DRAINAGE ATALLTIMESTO THE RISER STRUCTURE.
EXISTI FILTER ,��• 92.. CH
aw 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
P APPRO ED b= A p��' STRUCTURE.
dx
k 4. THE SOILS IN THE STORMWATER BUFFER AREA ARE OFTEN SEVERELY COMPACTED DURING THE CONSTRUCTION PROCESS TO ENSURE STABILITY THE DENSITY OF THESE COMPACTED
• -fl Q- SDP ZOO7=ODIISS �•\ ESLOS� o ~ 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
_ \I , IT CONTAINER -GROWN STOCK.
IYl
5. EXTRA MULCHING AROUND THE BASE OF TREES AND SHRUBS IS STRONGLY RECOMMENDED AS A MEANS OF CONSERVING MOISTURE AND SUPPRESSING WEEDS.
CONTRACTOR REQUIREMENTS: 1■ it
1. THE CONTRACTOR SHALL BE RESPONSIBLE FOR LAYOUT OF ALL WORK COVERED UNDER THESE PLANS.
■ is _ �"'°""� 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
> E ♦ . \ 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.
a 'w /J •� 5. THE LANDSCAPE CONTRACTOR IS RESPONSIBLE FOR VERIFYING THE LOCATION OF ANY ONSITE UTILITIES (CALL MISS UTILITY 1-800-552-7001 BEFORE ANY EXCAVATION).
Tc=0.28 hrs. 6. REFER TO THE APPROVED FINAL SITE PLANS FOR ANY DETAILED SITE INFORMATION.
Hit 90' OF OLF w/ A 7. ALL WORK SHALL BE COORDINATED WITH OTHER PARTIES.
• �� . ■ 1 I SUBAREA A _ I = LEFLOW B GOWN PULL BE WILL RED FOR SHIPMENTPLANTS CONTAINERS MANNER
THAW WILL NOT CAUSE DAMAGE
THEY HAVE GROWN.O THE BARK, BUDS, BRANCHES, STEMS, OR OVERALL SHAPE OF THE STOCK. CONTAINER
28 OF CONIC.
--- I .58 ac I w/ A ELEV.=1.5' 9. ALL PLANT MATERIAL, UNLESS OTHERWISE SPECIFIED, SHALL BE UNIFORMLY BRANCHED AND HAVE A VIGOROUS ROOT SYSTEM. PLANT MATERIAL SHALL BE HEALTHY, VIGOROUS, AND
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
130' CHANNEL FLOW WILT. PLANTS DEEMED UNHEALTHY WILL BE REJECTED.
- .01 HRS
IN PIPES 0
Tc=0.28 hrs. I 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' I / STOCK WITH POORLY DEVELOPED ROOT SYSTEMS WILL NOT BE ACCEPTED.
1' • /. I� • THEN THROUGH DETENTION - I i 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 BASIN 'B') 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.
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 MAY BE 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 SUFFICIENT TO CONTAIN THE ENTIRE ROOT BALL OR ROOT MASS WITHOUT
(D.B.2260:225 xA j z15 Nc s HACK UNE - - j - CRAMPING ROOTSTOCK.
/ S\ �- 1\
/"/ 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.
I 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 IN A ELEV. 2' / PROPOSED BOUNDA 18. THE CONTRACTOR WILL NOT BE RESPONSIBLE FOR PLANT MATERIALTHAT 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
BAN CHANNEL FLOW IN PIPES 0.02 HRS OF DISTURBANCE ( FACILITY CONSTRUCTION
DE IS
THE
- r 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
\ w /
%` �_ _� _ PROPOSED BOUNDA
`N� _ SIZING RULE EROSION AND SEDIMENT CONTROL REQUIREMENTS VS. STORMWATER TREATMENT REQUIREMENTS). INSTALLATION OF THE PERMANENT RISER SHALL BE INITIATED
�\ \ \ - OR THE VRRM WAT DURING THE CONSTRUCTION PHASE, AND DESIGN ELEVATIONS SHALL BESET WITH FINAL CLEANOUT OF THE SEDIMENT BASIN AND CONVERSION TO THE POST -CONSTRUCTION
�.�RR/ ALITY FACILITY IN MIND. APPROPRIATE PROCEDURES SHALL BE IMPLEMENTED TO PREVENT DISCHARGE OF TURBULENT WATERS WHEN THE BASIN IS BEING CONVERTED TO AN DETENTION
�z^o- / /\ ,� \. _- \ &oe\ QUIREMENTS, TY BASIN.
� W n ^� \ - 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
/\-'YY1 C�- . \ / zie• y i 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
DIMENSIONS AFTER THE ORIGINAL SITE CONSTRUCTION IS COMPLETE. MODIFICATIONS SHALL BE MADE TO THE RISER, ORIFICES AND BARRELS AS REQUIRED SO THATTHEY ARE
/
i i 0
/
CONSISTENT WITH THE FINAL CONSTRUCTION SPECIFICATIONS.
gra
� _ b
i
- - - 3. THE CONTRACTOR SHALL ASSEMBLE 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 PROJECT AREA 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 SHALL ALSO INSTALL THE 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 LEVEL AT THE DESIGN ELEVATION.
8. THE CONTRACTOR SHALL CONSTRUCT THE EMBANKMENT AND ANY i INTERNAL BERMS IN 8-TO12-INCH LIFTS, COMPACTION SHALL BE COMPLETED IN LIFTS WITH APPROPRIATE
EQUIPMENT THE CONTRACTOR SHALL ALSO ADHERE TO THE CLAY LINER SPECIFICATIONS OUTLINED IN TABLE 14.4 BELOW'
1114E _30' mK
Post -Development Impervious Area Summary 1BA8 "r % I i �1
Subarea A, Water Quantity
ROCK WALL ROCK WALr '
Building 13,017 sf - - -
_ Parking Areas/Roads 2,995 sf WE6 & TELEPHONE LINE
ESidewalks & Concrete 296 sf t
(� 1 16,308 sf ` I ■
- - Pre -Development Impervious Area Summary Subarea B, - - Water Qua
U.S. ROUTE 250 LOD, Water Quality Building
Building/Structure 0 sf Parking Areas/Roads
Roads/Driveways 8,964 sf Sidewalks & Concrete
8,964 sf
CN
Area,
ac.
1-year Flow,
cfs
2-year Flow,
cfs
10-year Flow,
cfs
FDA 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'B'
CHANNEL & FLOOD PROTECTION SUMMARY
23,621 sf
4,125 sf
698 sf
28,444 sf
GRAPHIC SCALE
15 30 60
( IN FEET )
1 inch = 30 ft.
Post -Development Impervious Area Summary
LOD, Water Quality
Building 35,416 sf
U• ROUTE 2,b0 Parking Areas/Roads 12,875 sf
vAe.a25, Sew Sidewalks & Concrete 994 sf
VAE) . L55- "
49,285 sf
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 (Energy Balance) N/A (Energy Balance Satisified) ISection C.2.b (10-yr. Post Flow < Pre Flow) I N/A (10-yr. Post Flow <Pre Flow Satisified)
Table 14.4. Clay Liner Specifications
Property
Test Method
Unit
Spectliscation
Permeabi rly
ASTM D-2434
Cm/sec
1 x 10
PI Index of Clay
ASTM D-4231424
%
Not less than 15
' uid Umil of Cla
ASTM D-2216
%
Not less than 30
Cla ParDGes Pass6g
ASTM D 422
%
Not less than 30
Clay Compaction
ASTM D-2216
%
95% of standard proctor density
Source: Virginia Stormwater Management Handbook (1999)
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 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.
12. THE CONTRACTOR SHALL NEXT STABILIZE EXPOSED SOILS BY HYDROSEEDING OR SEEDING OVER STRAW.
13. THE CONTRACTOR SHALLTHEN INSTALL THE 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 FIRST YEAR FOLLOWING INSTALLATION, AND THE OWNER THEREAFTER:
1. MEASURE SEDIMENT ACCUMULATION LEVELS IN THE BASIN.
2. MONITOR THE GROWTH OF THE GROUNDCOVER AND ANYTREES AND SHRUBS PLANTED, AS APPLICABLE. RECORD THE SPECIES AND THEIR APPROXIMATE COVERAGE, AND NOTE THE
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, 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 CRITICALTO 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)
G
SCOTTIR. Cr1LLINS7
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SHEET NO.
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DRY SWALE 'A' DETAIL, SCALE V=20' W t
I L
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\ PROPOSED 012" HOPE STANDPIPE WITH TRASHRACK
TO SERVE AS THE RISER STRUCTURE. SEE DETAIL ON
THIS SHEET, OR EQUIVALENT, FOR TRASHRACK. RISER
RIM ELEV=601.90. RISER TO HAVE ONE 8" LOW -FLOW
1I ORIFICE (INV =600.00). 10" HOPE OUTFALL PIPE INV
- 111 OUT=596.70. TO PREVENT FLOTATION THE RISER
BASE SHALL BE FIRMLY EMBEDDED 6" INTO AN iB"
1 THICK REINFORCED CONCRETE FOUNDATION THAT
\ IS 6'x6', AND BURIED BELOW GROUND.
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�I OUTLET
PROTECTION
s DIMENSIONS
StormRaxTM
ROUND SERIES TRASH RACK (OR EQUIVALENT)
CONCRETE MANHOLE
STANDARD 60 INCH RACK SHOWN
DIMENSIONS IN INCHES
PLAN
SIDE VIEW
Stormllax"" Round Series for Concrete Manhole
Pan No.
RS-24
RS•36
Dim A
17Y4
1 21 Y4
Dim B
143i
14 %
Dim C
Mln ID
Min DD
28 •
24
30
4036
36
43
RS 481
27 Y4
18
54 .
48
57
RS 601
27 %
18 34
6634
60
70
Plastic Solutions, Inc.
V PO Box 43ti6, Winchester, VA 22604
Z38 McGhee Rd, Wlrichester, VA 22603
:877)877-5727 phone
(540) 722.2219 fax
httlx//www.blastic-solutSon.com
DETENTION BASIN 'B' DETAIL, SCALE 1"=20'
GRAPHIC SCALE
20 0 10 20 40 80
HOPE STRUCTURAI PLASnC IFY
PLASTIC SCLUTICA S, INC.
( IN FEET )
1 inch = 20 ft.
OUAR-ER SECTION
REMOVABLE FOR ACCESS
ISOMETRIC
CONCRETE STRUCTURE DIMENSIONS
INSIDE STRUCTURE DIMENSION
OUTSIDE STRUCTURE DIMENSION
AVAILABLE OPTIONS
CROSS BRACING FOR OVERHANG
HOPE ANTI -VORTEX PLATE
CUSTOMER DATE -
DRAWN BY:
PRO ECT: APPU BY:
DETAIL
NO
Cr
PROPOSED 012" HOPE STANDPIPE WITH TRASHRACK TO SERVE AS THE RISER
STRUCTURE. SEE DETAIL ON THIS SHEET, OR EQUIVALENT, FOR TRASHRACK. RISER RIM
77 ELEV=589.80. RISER TO HAVE ONE 1.9" LOW -FLOW ORIFICE (INV: 586.00). 12" HOPE
OUTFALL PIPE INV OUT=586.09. TO PREVENT FLOTATION THE RISER BASE SHALL BE
FIRMLY EMBEDDED 6" INTO AN 18 THICK REINFORCED CONCRETE FOUNDATION
THAT IS 6'x6, AND BURIED BELOW GROUND.
��-6' TOP OF DAM = 590.70
1/2" zinc plated hook
attached with 3/8' fastener
®® — —1 FI° din, holes
coo ® ®
s
Isometric
111'4- HDPE pAtc (optional)
pipe
eulvertr'(7a
tiX: �r
--� HDPR sLrucLural pl aslic with
2-1/8" holes and 114" plate
manudacturcd by Plastic
�J Solutions Inc. or equal
1300
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shown Vitt optional plate
HbPE structural plaaic with
2-1/8" holeR and 1/4- plate
SCCttOII
manufactured by Plastic
Solutions Inc or equal
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P.q. Box 4:386
DEBRIS CAGE
SOLUTIONS Ainenes:er VA ali(H
INC. 877-877-151727
ru pleytu-kelr esm
Perforated cc
SEC 1I01� -A-U: TYPI( ALL (:ItAPHI(.AL 10EIALILS
f� Hornogeneous fill
I
4' min I
"Cut off trench-4' below suitable)
material
SaY or rock L-----------J
TYPICAL HOMOGENEOUS
EMBANKMENT
FOUNDATION DRAIN
dmia
t�x7runsition filter
CHIMNEY DRAIN
Coa fl
orour`�di s ors
"sin
Serld, ymei or rock
4mili eutbt
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Transition fill
,Rock or gravel
'-Blanket drain
BLANKET DRAIN
RQCA or gravel
drain
Transition filler
TOE DRAIN
iIpneerrng ticia manIJa(
Fiagure A -la. Honlogeaeorls Ernbankrrlerfts irI Seepage Coutrols
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 AT THIS 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.
SCOTT/R. CriLLINS'Z,
Lic. No. 035791 a
pow 9/16/204�
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