HomeMy WebLinkAboutWPO202000041 Plan - Revision WPO VSMP 2020-12-07AVON PARK II DEVELOPMENT
MILL CREEK
VILLAGE
c HOMES III
GENERAL NOTES
OWNER:
STANLEY MAR77N COMPANIES LLC
11710 PLAZA AMERICA DRIVE, SUITE 1100
RESTON, VA 20190
DEVELOPER:
STANLEY MARTIN HOMES
404 PEOPLE PLACE, SUITE 303
CHARLOTTESVILLE, VA 22911
ENGINEER:
COLLINS ENGINEERING
200 GARRETT ST SUITE K
CHARLOTTESVILLE, VA 22902
(434)293-3719
TAX MAP NO.:
090000-00-00-03100 (DB 5237, PG.405)
1960 AVON STREET EXTENDED
CHARLOTTESWLLE, VA 22902
TOTAL AREA:
5.262 ACRES
ZONING:
PRO PLANNED RESIDENTIAL DEVELOPMENT
(ZMA 2012-0004 & ZMA2014-6)
A VARIA77ON IS BEING REQUESTED WITH THIS INITIAL SITE PLAN AND PRELIMINARY
SUBDIVISION PLAT
PROPOSED USE:
RESIDENTIAL DEVELOPMENT - TOTAL 30 RESIDEN7AL LOTS
28 SINGLE FAMILY ATTACHED RESIDENTIAL UNITS (TH UNITS)
2 EXISTING SINGLE FAMILY DETACHED RESIDENTIAL UNIT
DENSITY-
ALLOWABLE DENSITY PER ZMA APPLICA7ON PLAN: 6 DU/AC
TOTAL ALLOWABLE NUMBER OF LOTS: 30 TOTAL LOTS
TOTAL NUMBER OF PROPOSED UNITS 30 RESIDENTIAL LOTS
PROPOSED VARIATIONS
A VARIAT70N TO THE APPROVED APPLICATI0N PLAN IS BEING SOUGHT WITH A WAIVER
REQUEST THAT SHALL ACCOMPANY THE REWEW AND APPROVAL OF THIS INITIAL SITE PLAN
AND PRELIMINARY SUBDIVSION PLAT. THE WAIVER SHALL INCLUDE A MODIFICATION TO THE
LAYOUT FROM THE ORIGINAL APPLICATION PLAN, A MODIFICATION TO THE ROADWAY
NETWORK (BUT WILL KEEP THE SAME ROADWAY CONNECTIONS), A MODIFICA7ON TO
THE SETBACKS (BASED ON THE ROADWAY CHANGES), AND A MODIFICATION TO THE TIMING
OF THE INSTALLATION OF THE LANDSCAPING BUFFER AREAS AND SCRIM FENCE.
OPEN SPACE:
TOTAL OPEN SPACE PROPOSED = 1.328 AC (25.27)
OPEN SPACE A: 6,850 SF
OPEN SPACE B: 50,999 SF
TOTAL OPEN SPACE REQUIRED (25%) = 1.316 ACRES
OPEN SPACE TO BE OWNED AND MAINTAINED BY THE HOMEOWNERS ASSOCIATION. ALL
OPEN SPACE SHALL BE RESERVED IN A DEED FOR THE COMMON USE OF LOT OWNERS IN
THE SUBDIVISION AND NO OPEN SPACE IS PROPOSED TO BE DEDICATED PUBLIC SPACE.
BUILDING HEIGHTS
MAXIMUM BUILDING HEIGHTS SHALL NOT EXCEED 30 FEET
RECREATIONAL AMENITIES
PER PROFFER #8, THE OWNER SHALL PROVIDE AND INSTALL A 40'x5O' FENCED DOG
PARK WITH (2) SMALL BENCHES AND (2) ADDITIONAL PLAY STRUCTURES FOR OLDER
CHILDREN IN THE EXISTING TOT LOT AREA ON 7MP090FO-00-00-OOA1, OWNED BY THE
AVON PARK COMMUNITY ASSOCIA770N.
SETBACKS:
FRONT.- 10' MINIMUM (18' MINIMUM FROM R/W OR EDGE OF SIDEWALK TO GARAGE)
SIDE. • NONE - MIN. 10' BUILDING SEPARATION
REAR: 10' MINIMUM (LOTS 1-4 & 13-28)
5' MINIMUM (LOTS 5-12)
SUBDIVSION STREETS:
CURB & GUTTER
WATERSHED:
RIVANNA RIVER DRAINAGE DISTRICT - NOTE.- THIS SITE IS NOT LOCATED WITHIN A PUBLIC
WATER SUPPLY RESERVOIR WATERSHED.
AGRICULTURAL/ FORESTAL
DISTRICT. NONE
TOPO & SURVEY:
THE BOUNDARY LINE AND PARCEL INFORMA7ION WAS PROVIDED BY ROUDABUSH, GALE AND
ASSOCIATES MAY 2018. THE TOPOGRAPHY INFORMATION IS BASED ON FIELD SURVEY
COLLECTED IN MAY 2010. THE PROPERTY IS CURRENTLY BE SURVEYED FOR UPDATED
TOPOGRAPHY FOR THE FINAL SITE PLAN. INFORMATION FIELD VERIFIED BY COLLINS
ENGINEERING MARCH 2O20.
DATUM:
NAD 83
EXISTING VEGETATION:
PAR77ALLY WOODED WI7H (2) RESIDENCES ON THE PROPERTY AND EXISTING
GRAVEL DRIVEWAYS.
LIGHTING:
NO STREET LIGHTING IS PROPOSED WITH THE DEVELOPMENT.
PARKING:
PARKING REQUIRED: 2 SPACES PER UNIT + (1 SPACE PER 4 SFA UNITS)
28 SFA UNITS + 2 SFD UNITS = 60 OFF-STREET PARKING SPACES
7 ON-STREET/SURFACE PARKING SPACES
TOTAL PARKING SPACES REQUIRED: 67 SPACES
PARKING SPACES PROVIDED (MINIMUM (1) DRIVEWAY SPACE + (1) GARAGE SPACE):
OFF-STREET PARKING SPACES: (2) SPACES PER LOT = 60 SPACES
ON-STREET/SURFACE PARKING SPACES PROVIDED FOR GUEST PARKING = 21 SPACES
TOTAL PARKING SPACES PROVIDED: 81 TOTAL PARKING SPACES
PHASING:
THIS PROPERTY SHALL BE DEVELOPED WITHIN 1 PHASE.
BUILDING SITES
PARCELS 1-30 EACH CONTAIN A BUILDING SITE THAT COMPLIES WITH THE REQUIREMENTS
OF SECT70N 4.2.1 OF THE ALBEMARLE COUNTY ZONING ORDINANCE.
BURIAL SITES:
NO KNOWN CEMETERIES EXISTS ON THE PROPERTY.
STREAM BUFFERS:
THERE ARE NO WO 100' STREAM BUFFERS ON THIS PROPERTY. ANY STREAM BUFFER
SHALL BE MANAGED IN ACCORDANCE WITH THE ALBEMARLE COUNTY WATER PROTECTION
ORDINANCE.
WETLANDS/STREAMS.
THERE ARE NO WETLANDS OR STREAMS LOCATED ON THE PROPERTY.
FLOODPLAIN:
THE PROPERTY LIES IN AN AREA DESIGNATED AS ZONE X AS SHOWN ON THE FLOOD
INSURANCE RATE MAP COMMUNITY PANEL NO: 51003C0407D, DATED FEBRUARY 4, 2005.
CRITICAL SLOPES
THERE ARE PRESERVED SLOPES ON THE PROPERTY. MANAGED SLOPES ARE SHOWN ON
THE PROPERTY BASED ON THE ALBEMARLE COUNTY GIS MAPPING FOR THIS PARCEL.
THESE MANAGED SLOPES ARE SHOWN ON SHEET 2 AND SHEET 4 AND SHALL BE MANAGED
IN ACCORDANCE WITH THE ALBEMARLE COUNTY ZONING REQUIREMENTS.
RETAINING WALLS:
NO RETAINING WALLS ARE PROPOSED WITH THE DEVELOPMENT.
LANDSCAPING.
STREET TREES ARE PROPOSED ALONG THE NEIGHBORHOOD STREETS IN ACCORDANCE WITH
ALBEMARLE COUNTY LANDSCAPING REQUIREMENTS Wl7HIN SECT70N 32.7.9 OF THE COUNTY
CODE.
IN ADDITIONAL, LANDSCAPING BUFFERS SHALL BE PROVIDED ALONG THE BOUNDARY OF THE
PROPERTY IN ACCORDANCE WITH THE APPROVED APPLICATION PLAN AND PROFFERS. SEE
THIS SHEET AND SHEET 3 FOR ADDITI0NAL INFORMATI0N ON THE REQUIRED AND PROPOSED
LANDSCAPING BUFFERS. ALL LANDSCAPING BUFFER AREAS SHALL BE INSTALLED PRIOR TO
THE FIRST CERTIFICATE OF OCCUPANCY.
TRASH:
EACH LOT SHALL HAVE AN INDIWDUAL TRASH CONTAINER TO BE STORED WITHIN THE
GARAGE.
STORMWATER MANAGEMENT • ONE UNDERGROUND DETENT70N FACILITY AND A DETENT70N POND ARE PROPOSED WITH
THE DEVELOPMENT TO ACCOMMODATE THE WATER QUANTITY REQUIREMENT FOR THE
PROJECT. WATER QUALITY SHALL ACCOMPLISHED WITH THE PURCHASE OF NUTRIENT
CREDI IS.
VSMP PLAN (WP02020000411
SCOTTSVILLE DISTRICT
ALBEMARLE COUNTY, VIRGINIA
N/F JENNIFERIL --tT— I �\ I L
CERARDI '
DB 4757 PC 433
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TMPN/F ALBEMARLE COUNTY
SERVICE AUTHORITYDB
3571 PC 272fF-Tv2
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N/F CARY D BROOKS JR
DB 4858 PC 406
GRAPHIC SCALE
IMP 90E-6
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DB 4091 PC 534
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IMPERVIOUS AREAS: THE TOTAL OVERALL SITE IMPERVIOUS AREA CAN NOT EXCEED 377,
PER THE APPROVED ZMA APPLICATI0N PLAN:
ROADS: 0.63 AC (PAVED CIRCULATION PARKING AREA = 27,380 SF)
SIDEWALKS: 0.11 AC
BUILDINGS/DRIVEWAYS 1.12 AC
TOTAL: 1.86 AC (35.39 IMPERVIOUS AREA)
PROPOSED USES: LOTS: 127,162 SF (2.919 AC)
ROADS (R/W & PRIVATE ACCESS ESM1): 44,200 SF (1.015 AC)
OPEN SPACE: 57,849 SF (1.328 AC)
OFFSITE EASEMENT ALL PROPOSED GRADING SHALL BE CONSTRUCTED ON SITE OR WITHIN
EXISTING RIGHT-OF-WAY. THERE ARE ALSO EXIS77NG OFFSITE
EASEMENTS FOR THE ROADWAY AND UTILITY CONNECTIONS TO THE
AVON PARK DEVELOPMENT.
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LOT ILO I LOT I `
19 20 21 1 —22
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IMP 90-32A
N/F ROBERT SPAULS
DB 982 PC 365
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OPEN SPACE /
\ AREA
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-- LOT 29 LOT3
40,020 SF 0.83 ACRES
' 0.92 ACRES '
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TMP 90-30A I
N/F CARY D OR MYRTLE T BROOKS
DB 1191 PC 396 0 13 F-1
NOTES.•
1) THIS PROPERTY DOES NOT LIE WITHIN AN AGRICULTURAL AND/OR FOREST DISTRICT.
2) ONLY (1) DWELLING PER LOT SHALL BE PERMITTED.
3) ALL PROPOSED EASEMENTS SHALL BE DEDICATED TO PUBLIC USE.
4) STREET TREES SHALL BE PROVIDED ALONG ALL THE PUBLIC STREETS 40' O.C. IN ACCORDANCE WITH
VDOT AND ALBEMARLE COUNTY STANDARDS.
5) THIS PROPERTY IS NOT LOCATED WITHIN A DAM INUNDATION ZONE.
Imp au-autf
N/F JOHN A OR RUBY T BROOKS
DB 1191 PC 396
VICINITY MAP
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Sheet List Table
Sheet Number
Sheet Title
1
COVER SHEET
2
EXISTING CONDITIONS
3
EROSION & SEDIMENT CONTROL NARRATIVE
4
EROSION & SEDIMENT CONTROL DETAILS
5
PHASE I - EROSION & SEDIMENT CONTROL PLAN
6
PHASE IIA - EROSION & SEDIMENT CONTROL PLAN
7
PHASE 116 - EROSION & SEDIMENT CONTROL PLAN
8
PHASE IIC - EROSION & SEDIMENT CONTROL PLAN
9
PHASE III - EROSION & SEDIMENT CONTROL PLAN
10
EROSION & SEDIMENT CONTROL DETAILS & CALCULATIONS
11
STORMWATER MANAGEMENT PLAN
12
STORMWATER MANAGEMENT DETAILS
13
STORMWATER MANAGEMENT DETAILS
14
STORMWATER MANAGEMENT DETAILS
15
OVERLOT GRADING PLAN
15 TOTAL NUMBER OF SHEETS
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Pared construction entrance for ertwion control plans 1992 3.05 1992 3.05 1992 3.07 TH OF
E S C PROFFERS STONE 11 CONSTRUCTION OF A SILT FENCE CONSTRUCTION OF A SILT FENCE GRAVEL CURB INLET SEDIMENT
4) EROSIONANllSEDIMENTCONTROL CONSTRUCTION (WITH WIRE SUPPORT) (WITHOUT WIRE SUPPORT) FILTER
Access % 5' S4-2A ASP=AL1 TOP SCOTT R. LINS'Z
COURSE t. SET POSTS AND EXCAVATE A a"xa" 2. STAPLE WIRE FENCING To THE Posrs. 1. SET THE STAKES. 2. EXCAVATE A 47X 4" TRENCH '-+
EAVEMI c TRENCH UPSLOPE ALONG THE LINE UPSLOPE ALONG THE LINE OF Li LTC. NO. O35%91 .�
PAVEMF^i.
The Owner shall provide additional erosion and sediment control measures beyond the standard regulatory �r.�.__. �.� :x - DF PosTs. STAKES. _�-
requirements stated in the Virginia Erosion and Sediment Control Handbook (VESCH) applicable on the date 6'MAX. 10/19/20 4�
of approval of this Proffer Statement. These additional measures shall consist of the following:
P 6- MN. 2'A AGGREGATE BASE Illy' /- / _ =C Il�r�
a) Silt Fencing (VESCH Standard 3.05): ROFILE III ll j IIII /
i) Contributing drainage area to non -wire reinforced silt fence shall be reduced from one quarter (0,25) -
70MIN. ��II 1 l '-
acre per 100 feet of silt fence length to two -tenths (.20) per 100 feet of silt fence. Contributing drainage sroNE I ) _ I Flaw
CONSTRUCTION ASPHALT PAVED \
area to wire reinforced silt fence shall not exceed one quarter acre per 100 feet of silt fence; and Acctss - � " WASHwIc%
4
ii) Maximum contributing drainage area to non -wire reinforced silt fence from minor swales or ditch lines
E10S71NG 1 3. STAPLE FILTER MATERIAL 4. BACKFILL AND COMPACT
shall be reduced from 1 acre and no greater than 1 cfs to 0.8 acre and no greater than .08 cfs. Maximum "'' 2% 2![ PAVE4ENTJ FLOW III I III �11 TO STAKES AND EXTEND THE EXCAVATED SOIL.
contributing drainage area to wire reinforced silt fence from minor swales or ditch lines shall be 1 acre 12% T 2' WIN.- 4" IT INTO THE TRENCH.
and no greater than I efs; and t
GRAVEL FILTER ` 1Y
3. ATTACH THE FILTER FABRIC TO THE WIRE 4. BACKFILL AND COMPACT THE RUNOFF WATER WIRE MESH
iii) The height of any silt fence shall be a minimum of 24 inches above the original ground surface and I �� POSITIVE DRAINAGE FENCE AND EXTEND IT INTO THE TRENCH. AVATED SOIL j FILTERED WATER
/n
'MAST EXTEND FULL WIDTH `--�
To SEDIMENT z
shall not exceed 34 inches above ground elevation; and OF INGRESS AND EGRESS _ _
OPERATION TRAPPING DEVICE III LU
iv) Pnst spacing for n0pimWinn-reinforced silt fence shall he reduced from a maximum 6 feet apart to a rim
maximum 5 feet apart. Post spacing for wire reinforced silt fence shall be reduced from a maximum / A U
10 feet agar to a maximum 8 feet apart _ - / ALo/ / k II/V III II a o , A V l �
12 MIN. IIIVE DRAINACI /�- I ---- • II I. a
b) Temporary Diversion Dike (VESCH Standard 3.09): za TO SEDIMENT / I / w V _ II SHEET FLOW INSTALLATION SEDIMENT o 1=
TRAPPING DEVICE / �/ (PERSPECTIVE VIEW) o - O ID. O
1) The maximum allowable drainage area to a tempurary diversion dike shall be reduced front five (5) / I -I FLOW = CONCRETE GUTTER 72" LU Ln J
CURB INLET Q J Q
acres to three (3) acres. rn. TTR s a w III "" A A V J z a LU
SECTION A -A =III - FLo rt IS \\� N o F- m
e) Temporary Sediment Trap (VESCH Standard 3.13): EXTENSION OF FABRIC AND WIRE INTO THE TRENCH. - - - / - - - SPECIFIC APPLICATION n Z Q
A nwlauluu wale lap of I Inc h must he uiMalled lath a ulamwInl I Inch balk tick \X LU LU
1) Maximum total contributing drainage area shall be reduced from three (3) acres to two (2) acres; 8nd ihlll VII A ah a sllpptAalY a U'.l>II burg rltlh a Thaalela ut I wLhes too nlopule FILTER FABRIC �\ THIS METHOD OF INLET PROTECTION IS APPLICABLE AT CURB INLETS W
L 01031" pi e's IIIe. 1V aAI cv.11 et uwfl be L:M red away- 130111 the ell" vie to all IIIII WHERE POIN FRONT THE STRUCTURE NOT LIKELY TO CAUSE Ce
ii) The storage volume requirement shall be increased by a factor of 1.2. appl m'eLl aenlulu v ea to Irruuce >eLWueld .111 KeLluuead <ha8 be pl n'mtM t, _ _ W RE INCONVENIEENCENCE T OR DAMAGE TO ADJACENT STRUCTURES AND UNPROTECTED UJI
POINTS A SHOULD HE HIGHER THAN POINT B. AREAS.
eafama stout ch amN. ddctes of AA-atncolnses. I DRAINAGEWAY INSTALLATION w
d) Temporary Sediment Basin (VESCH Standard 3.I4): I� (FRONT ELEVATION) GRAVEL SHALL BE VDOT g3, I1357 OR 5 COARSE AGGREGATE. d'
PAVED WASH RACK Source: Adapted from Installation of Straw and Fabric Filter
Source: Adapted from Installation of Straw and Fabric Filter
i) A temporary sediment basin shall be provided where the total contributing drainage area exceeds two
Barriers for Sediment Control, Sherwood and Wyant Plate 3.05-1 farriers for Sediment Control. Sherwood and Wyant Plate 3.05-2 Source: Va. DSWC Plate 3.07-6
(2) acres; and
ii) The permanent pool and dry storage volumes shall be increased by a factor of 1.2. 1992 3.08
1992 3.18 1992 3.36 1992 3.38
SILT FENCE CULVERT INLET PIPE OUTLET CONDITIONS TYPICAL ORIENTATION OF FENCING AND ARMORING
PROTECTION A A TREATMENT -
CUT/FILL QUANTITIES: ENDWALL (SOIL STABILIZATION BLANKET)
o 0
;= N
3d siwLLow H
Q __________- SLOPE f�
VOLUME OF CUT FOR LIMITS OF DISTURBANCE: 21,240 CU. YARD _ __ _V_________ __ do I 0 00 o
VOLUME OF FILL FOR LIMITS OF DISTURBANCE: 16o CU. YARD IT --- T ON SHALLgY SLOPES, STRIPS OF
3, 3 1 PIPE OUTLET TO FIAT NETTING PROTECTNE COVERINGS DRIP UNE� I
NET VOLUME OF CUT FOR LIMITS OF DISTURBANCE: 8 o8o CU. YARD TOE of Flu *- CULVERT AREA WITH NO DEFINED I MAY BE APPLIED ACROSS
/ I CHANNEL THE SLOPE.
PLAN VIEW
6" OF TOPSOIL SHALL BE HAULED OFFSITE TO A PERMITTED (SWPPP) SITE I I I
THE REMAINDER OF SURPLUS CUT WILL BE SPREAD WITHIN THE LIMITS OF DISTURBANCE IN THE - - I - SNOW FENCE
EXISTING SINGLE FAMILY LOTS TO HELP CREATE MORE MODERATE SLOPES. ; ; L a BERM
I I O X _� B0
RINGE THERE IS A THE MATERIAL EOVER RM ATHE HB BERM AND THEOF SLOPE,
IT
Il lS�
AS EXPLAINED IN EACH PHASE NARRATIVE AND REITERATED HERE, PERMANENT OR ,- BEHIND THE BERM.
TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN SEVEN DAYS - V ISM o (\
AFTER FINAL GRADE IS REACHED ON ANY PORTION OF THE SITE. TOE OF FILL SECTION A -A FILTER c DrH KEY N e'-B'; RECOMMENDED FOR ENTIRE PERIMETER sLo�PPE I co
WIN
IRN (v
STABILIZATION SHALL BE APPLIED WITHIN SEVEN DAYS TO DENUDED AREAS THAT MAY NOT BE Sohn ENCE BOARD FENCE am ® tT
F DISTANCE IS I' MINIMUM IF FLOW A ON � SLDPR, APPLY
AT FINAL GRADE BUT WILL REMAIN DORMANT (UNDISTURBED) FOR LONGER THAN 3o DAYS. IS TOWARD EMBANKMENT �- TO°TH DIE IRECCTITION OF PARALLEL
Li� L CORD FENCE
3d (MIN.) AID ANCHOR SECURELY.
PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR ROW A Q Pu C FENCE co
MORE THAN ONE YEAR. ** d ! ` CORRECT METHODS OF TREE FENCING
OPTIONAL STONE COMBINATION -------
PIPE OUTLET TO WELL W N
DEFINED CHANNEL PLAN VIEW -
i 8 BRING MATERIAL DOWN TO A LEVEL AREA BEFORE 0 ) I
TERMINATING THE INSTALLATION. TURN THE END 1 1 N ,^
UNDER 4' AND STAPLEAT 1Y INTERVALS.V /
L B ..tY fj N
FLOW N DITCH FLOW _
2.5' d IN DITCHES, APPLY PROTECTNE CO RING /.. II-
_ PARALLEL TO TIE DIRELTON OTHF" FLOW. > < LV
SECTION A -A USE CHECK SLOTS AS REQUIRED. AVOID / Q
JOINING MATERIAL IN E CENTER OF / 'M� 1
FILTER CLOTH EEY IN 8"-S': RECOMMENDED FOR ENTIRE PERIMETER THE DRLH IF AT ALL POSSIBLE. „/�^ i/ �\ - J 1
NOTES: 1. APRON LINING MAY BE RIPRAP. GROUTED RIPRAP. CARTON i J_ J
CLASS I RIPRAP BASKET, OR CONCRETE.
"VDOT 13, t1357 OR r5 COARSE AGGREGATE 2. I IS THE LENGTH OF THE RIPRAP APRON AS CALCULATED CORRECT TRUNK ARMORING Q
TO REPLACE SILT FENCE IN " HORSESHOE " WHEN00
HIGH VELOCITY OF FLOW 15 EXPECTED USING PLATES 3.18-3 AND 3.18-4, M' CC
9. it = 1.5TIMES THE MAXIMUM STONE DIAMETER, BUT NOT TRIANGULAR BOARD FENCE w
T
LESS THAN 8 INCHES. G
U) z
Source: Adapted from VDOT Standard L9> 0 Sheets and Va. DSWC Plate 3.08-1 Source: Va. DSWC Plate 3.18-1 Source: Adapted from Ludlow Products Brochure Plate 3.36-1 Source: Va. DSWC Plate 3.38-2 o U
1
1992 3.01 1992 3.07
TEMPORARY DIVERSION DIKE 1992 3.14 2 1�-1 w
SAFETY FENCE SILT FENCE DROP INLET EXAMPLE PLAN VIEWS OF W U Q
PROTECTION
BAFFLE L 0 CA TIONS IN Y
,:: 2 % 4' VDOD FRAME DROP INLET Compacted Soil SEDIMENT BASINS LLI Q
LU
loss . ® WITH GRATE 1
�, r- �/
1A%.Jr
••• ■•■ ^ FRAME 18 II11R D 2/ _.I I N° SCALE
W
NON I... � \ -F10W INFLOWRISER Lfl
-. cn z z
o -1 '^
3' MIN. �LU > v /
_ _ � /`rrD/Z
OOL \ L = ME DISTANCE FROM w
4.5' min. NORMAL P -IIII THE PqM OF INFLOW
GATHER I ARWNO THE BAFFLE TO z
EXCESS COR THE RISER. - LU
I1/I�� AT CORNERS U // /�NORMAL POOL - U)
PERSPECTIVE VIEWS �� 0/{2 � ) RISER
° 1 &FFLI w
STAKE
PERSPECTIVE VIEW I I Q
FABRIC
A fNm
rtTe
v NORMAL POOL RISER INFLOW
^�
�•..e y< 1f<-k .�Gh+.' l' MIN. �� o
IIII `\\ `
O
o BAFFLE N
�
° ELEVATION OF STAKE AND °/2 /
h _ FABRIC ORIENTATION DETAIL A \`Z'`
t L Ltf L2
INFLOW
.I SPECIFIC APPLICATION LU
I w
IS SHEETS OF 4' X IV L 1/7 EXTERIOR Ir W
PLYWOOD Oil EQUIVALENT O ,�t ""'" THIS METHOD OF INLET PROTECTION IS APPLICABLE WHERE THE IY 2
.cw',E ..si Lli�m„�„ ",,,o „E INLET DRAINS A RELATIVELY FLAT AREA (SLOPE NO GREATER RrsER cREsr ELEvnnal a
5 MAX. �q,p�+ THAN 5% WHERE THE INLET SHEET OR OVERLAND FLOWS NOT
5' MIN. �.o}(-' ` EXCEEDING 1 C.F.S.) ARE TYPICAL. THE METHOD SHALL NOT i i 4' iSIZE scuAB
JOB NO.
PERSPECTIVE VIEW PERSPECTIVE VIEW APPLY TO INLETS RECEIVING CONCENTRATED FLOWS, SUCH AS i ii ii OR S POSTSMROUND. SET AT E 112066
PLASTIC FENCE METAL FENCE IN STREET OR HIGHWAY MEDIANS. LEAST 3' INTO THE GROUND.
E' SCALE
AS NOTED
Source: Adapted from Conwed Plastics and Plate 3.01-1 Source: N.C. Erosion and Sediment Control
VDOT Road and Bridge Standards Planning and Design Manual 1988 Plate 3.07-1 Source: USDA-SCS Plate 3.14-6 SHEET NO.
4
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 PROTEC7VE BARRIER INSTALLED TO PREVENT ACCESS TO AN EROSION CONTROL MEASURE. TO PROHIBIT THE UNDESIRABLE USE OF AN
EROSION CONTROL MEASURE BY THE PUBLIC. APPLICABLE TO ANY CONTROL MEASURE OR SERIES OF MEASURES WHICH CAN BE CONSIDERED
UNSAFE BY VIRTUE OF POTENTIAL ACCESS BY THE PUBLIC.
3.02 CONSTRUCTION ENTRANCE:
A STABILIZED PAVED CONSTRUCTION ENTRANCE WITH A WASH RACK LOCATED AT POINTS OF VEHICULAR INGRESS AND EGRESS ON A
CONSTRUCTION SITE TO REDUCE THE AMOUNT OF MUD TRANSPORTED ONTO PAVED PUBLIC ROADS BY MOTOR VEHICLES OR RUNOFF.
CONSTRUCTION ENTRANCES SHALL BE INSTALLED AS SHOWN ON THE PLANS TO REDUCE THE AMOUNT SEDIMENT TRANSPORTED ONTO PUBLIC
ROADWAYS.
3.05 SILT FENCE:
A TEMPORARY SEDIMENT BARRIER CONSISTING OF A SYNTHETIC FILTER FABRIC STRETCHED ACROSS AND ATTACHED TO SUPPORTING POSTS AND
ENTRENCHED, TO INTERCEPT AND DETAIN SMALL AMOUNTS OF SEDIMENT FROM DISTURBED AREAS DURING CONSTRUCTION OPERATIONS IN ORDER
TO PREVENT SEDIMENT FROM LEAVING THE SITE, AND TO DECREASE THE VELOCITY OF SHEET FLOWS AND LOW -TO -MODERATE LEVEL CHANNEL
FLOWS. THE SILT FENCE BARRIERS SHALL BE INSTALLED DOWN SLOPE OF AREAS WITH MINIMAL GRADES TO FILTER SEDIMENT LADEN RUNOFF
FROM SHEET FLOW AS INDICATED. THEY SHALL BE INSPECTED IMMEDIATELY AFTER EACH RAINFALL AND MAINTAINED IN ACCORDANCE WITH THE
VIRGINIA EROSION & SEDIMENT CONTROL HANDBOOK (VESCH).
3.07 STORM DRAIN INLET PROTECTION:
A SEDIMENT FILTER OR AN EXCAVATED IMPOUNDING AREA AROUND A STORM DRAIN DROP INLET OR CURB INLET TO PREVENT SEDIMENT FROM
ENTERING STORM DRAINAGE SYSTEMS PRIOR TO PERMANENT STABILIZATION OF THE DISTURBED AREA. INLET PR07ECT70N APPLIES WHERE
STORM DRAIN INLETS ARE TO BE MADE OPERATIONAL BEFORE PERMANENT STABILIZA7ION OF THE CORRESPONDING DISTURBED DRAINAGE AREA.
3.08 CULVERT INLET PROTECTION.
A SEDIMENT FILTER OR AN EXCAVATED IMPOUNDING AREA AROUND A STORM CULVERT. TO PREVENT SEDIMENT FROM ENTERING STORM
CULVERTS PRIOR TO PERMANENT STABILIZAT70N OF THE DISTURBED AREA. INLET PR07EC77ON APPLIES WHERE STORM CULVERTS ARE EXIS77NG
OR TO BE MADE OPERATIONAL BEFORE PERMANENT STABILIZAT70N 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 SI7£
DURING CONSTRUCTION. THESE STRUCTURES GENERALLY HAVE A LIFE EXPECTANCY OF 18 MONTHS OR LESS, WHICH CAN BE PROLONGED WITH
PROPER MAINTENANCE.
3.12 DIVERSION:
A CHANNEL CONSTRUCTED ACROSS A SLOPE WITH A SUPPOR7ING EARTHEN RIDGE ON THE LOWER SIDE. TO REDUCE SLOPE LENGTH AND TO
INTERCEPT AND DIVERT STORMWATER RUNOFF TO STABILIZED OUTLETS AT NON -EROSIVE VELOCITIES. APPLIES WHERE RUNOFF FROM AREAS OF
HIGHER ELEVATION MAY DAMAGE PROPERTY, CAUSE EROSION, OR INTERFERE WITH THE ESTABLISHMENT OF VEGETATION ON LOWER AREAS,
WHERE SURFACE AND/OR SHALLOW SUBSURFACE FLOW IS DAMAGING SLOPING UPLAND, AND WHERE THE SLOPE LENGTH NEEDS TO BE REDUCED
TO MINIMIZE SOIL LOSS.
3.13 TEMPORARY SEDIMENT TRAP:
A TEMPORARY PONDING AREA FORMED BY CONSTRUC7ING AN EARTHEN EMBANKMENT WITH A STONE OUTLET. TO DETAIN SEDIMENT -LADEN
RUNOFF FROM SMALL DISTURBED AREAS LONG ENOUGH TO ALLOW THE MAJORITY OF THE SEDIMENT TO SETTLE OUT. USE BELOW DISTURBED
AREAS WHERE THE TOTAL CONTRIBU7ING DRAINAGE AREA IS LESS THAN 3 ACRES, WHERE THE SEDIMENT TRAP WILL BE USED NO LONGER THAN
18 MONTHS, AND IT MAY BE CONSTRUCTED EITHER INDEPENDENTLY OR IN CONJUNCTION WITH A TEMPORARY DIVERSION DIKE.
3.14 TEMPORARY SEDIMENT BASIN.
A TEMPORARY BARRIER OR DAM WITH A CONTROLLED STORMWATER RELEASE STRUCTURE FORMED BY CONSTRUCTING AN EMBANKMENT OF
COMPACTED SOIL ACROSS A DRAINAGEWAY. TO DETAIL SEDIMENT -LADEN RUNOFF FROM DISTURBED AREAS IN "WET" AND `DRY" STORAGE
LONG ENOUGH FOR THE MAJORITY OF THE SEDIMENT TO SETTLE OUT. APPLIES BELOW DISTURBED AREAS WHERE THE TOTAL CONTRIBUTING
DRAINAGE AREA IS EQUAL TO OR GREATER THAN THREE ACRES. THERE MUST BE SUFFICIENT SPACE AND APPROPRIATE TOPOGRAPHY FOR THE
CONSTRUCTION OF A TEMPORARY IMPOUNDMENT.
3.18 OUTLET PROTECTION:
STRUCTURALLY LINED APRONS OR OTHER ACCEPTABLE ENERGY DISSIPA77NG DEVICES PLACED AT THE OUTLETS OF PIPES OR PAVED CHANNEL
SECTIONS. TO PREVENT SCOUR AT STORMWATER OUTLETS, TO PROTECT THE OUTLET STRUCTURE, AND TO MINIMIZE THE P07EN77AL FOR
DOWNSTREAM EROSION BY REDUCING THE VELOCITY AND ENERGY OF CONCENTRATED STORMWATER FLOWS. APPLICABLE TO THE OUTLETS OF
ALL PIPES AND ENGINEERED CHANNEL SECTIONS.
3.19 RIPRAP:
A PERMANENT EROSION -RESISTANT GROUND COVER OF LARGE, LOOSE, ANGULAR STONE WITH FILTER FABRIC OR GRANULAR UNDERLINING. TO
PROTECT THE SOIL FROM THE EROSIVE FORCES OF CONCENTRATED RUNOFF, SLOW THE VELOCITY OF CONCENTRATED RUNOFF WHILE ENHANCING
THE POTENTIAL FOR INFILTRATION, AND TO STABILIZE SLOPES WITH SEEPAGE PROBLEMS, AND/OR NON -COHESIVE SOILS. USE WHEREVER SOIL
AND WATER INTERFACE AND THE SOIL CONDITIONS, WATER TURBULENCE AND VELOCITY, EXPECTED VEGETATIVE COVER, ETC., ARE SUCH THAT
THE SOIL MAY ERODE UNDER THE DESIGN FLOW CONDITIONS.
3.20 ROCK CHECK DAMS:
SMALL TEMPORARY STONE DAMS CONSTRUCTED ACROSS A SWALE OR DRAINAGE DITCH. TO REDUCE THE VELOCITY OF CONCENTRATED
STORMWATER FLOWS, THEREBY REDUCING EROSION OF THE SWALE OR DITCH. THIS PRACTICE ALSO TRAPS SEDIMENT GENERATED FROM
ADJACENT AREAS OR THE DITCH ITSELF, MAINLY BY PONDING OF THE STORMWATER RUNOFF. THIS PRACTICE, UTILIZING A COMBINATION OF
STONE SIZES, IS LIMITED TO USE IN SMALL OPEN CHANNELS WHICH DRAIN 10 ACRES OR LESS
3.31 TEMPORARY SEEDING:
THE ESTABLISHMENT OF A TEMPORARY VEGETATIVE COVER ON DISTURBED AREAS BY SEEDING WITH APPROPRIATE RAPIDLY GROWING ANNUAL
PLANTS. TO REDUCE EROSION AND SEDIMENTATION BY STABILIZING DISTURBED AREAS THAT WILL NOT BE BROUGHT TO FINAL GRADE FOR A
PERIOD OF MORE THAN 30 DAYS. TO REDUCE DAMAGE FROM SEDIMENT AND RUNOFF TO DOWNSTREAM OR OFF -SITE AREAS, AND TO PROVIDE
PROTECTION TO BARE SOILS EXPOSED DURING CONSTRUCTION UNTIL PERMANENT VEGETATION OR OTHER EROSION CONTROL MEASURES CAN BE
ESTABLISHED.
3.32 PERMANENT STABILIZATION:
THE ESTABLISHMENT OF PERENNIAL VEGETATIVE COVER ON DISTURBED AREAS BY PLAN77NG SEED. TO REDUCE EROSION AND DECREASE
SEDIMENT YIELD FROM DISTURBED AREAS. TO PERMANENTLY STABILIZE DISTURBED AREAS IN A MANNER THAT /S ECONOMICAL, ADAPTABLE TO
SITE CONDITIONS, AND ALLOWS SELECTION OF THE MOST APPROPRIATE PLANT MATERIALS. TO IMPROVE WILDLIFE HABITAT. TO ENHANCE
NATURAL BEAUTY. UPON COMPLETION OF CONSTRUCTION ACTIVITIES, ALL AREAS WILL RECEIVE A PERMANENT VEGETATIVE COVER.
3.35 MULCHING.
APPLICATION OF PLANT RESIDUES OR OTHER SUITABLE MATERIALS TO THE SOIL SURFACE. TO PREVENT EROSION BY PROTECTING THE SOIL
SURFACE FROM RAINDROP IMPACT AND REDUCING THE VELOCITY OF OVERLAND FLOW. TO FOSTER THE GROWTH OF VEGETATION BY INCREASING
AVAILABLE MOISTURE AND PROVIDING INSULATION AGAINST EXTREME HEAT AND COLD. AREAS WHICH HAVE BEEN PERMANENTLY SEEDED
SHOULD BE MULCHED IMMEDIATELY FOLLOWING SEEDING. AREAS WHICH CANNOT BE SEEDED BECAUSE OF THE SEASON SHOULD BE MULCHED
USING ORGANIC MULCH. MULCH MAY BE USED TOGETHER WITH PLANTINGS OF TREES, SHRUBS OR CERTAIN GROUND COVERS WHICH DO NOT
PROVIDE ADEQUATE SOIL STABILIZATION BY THEMSELVES, CAN BE USED IN CONJUNCTION WITH TEMPORARY SEEDING.
3.37 TREES SHRUBS VINES & GROUND COVERS:
STABILIZING DISTURBED AREAS BY ESTABLISHING VEGETATIVE COVER WITH TREES, SHRUBS, VINES, OR GROUND COVERS. TO AID /N STABILIZING
SOIL /N 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 ILDLIFE HABITAT.
3.36 BLANKET MATTING:
INSTALLATION OF A PROTEC7VE COVERING OR A SOIL STABILIZATION MAT ON A PREPARED PLANING AREA OF A STEEP SLOPE OR CHANNEL TO
AID IN THE CONTROLLING EROSION ON CRITICAL AREAS.
3.38 TREE PRESERVATION AND PROTECTION:
PROTECTION OF DESIRABLE TREES FROM MECHANICAL OR OTHER INJURY DURING LAND DISTURBING AND CONSTRUCTION ACTIVITY. TO ENSURE
THE SURVIVAL OF DESIRABLE TREES WHERE THEY WILL BE EFFECTIVE FOR EROSION AND SEDIMENT CONTROL, WATERSHED PROTEC77ON,
LANDSCAPE BEAUTIFICATION, DUST AND POLLU77ON CONTROL, NOISE REDUCTION, SHADE AND OTHER ENVIRONMENTAL BENEFITS WHILE THE LAND
IS BEING CONVERTED FROM FOREST TO URBAN -TYPE USES APPLIES IN 7REE-INHABI7ED AREAS SUBJECT TO LAND DISTURBING ACTIVITIES.
3.39 DUST CONTROL:
REDUCING SURFACE AND AIR MOVEMENT OF DUST DURING LAND DISTURBING, DEPOSITION AND CONSTRUCTION ACTIVITIES TO PREVENT
SURFACE AND AIR MOVEMENT OF DUST FROM EXPOSED SOIL SURFACES AND REDUCE THE PRESENCE OF AIRBORNE SUBSTANCES WHICH MAY
PRESENT HEALTH HAZARDS, TRAFFIC SAFETY PROBLEMS OR HARM ANIMAL OR PLANT LIFE. DUST CONTROL MEASURES SHALL BE EMPLOYED TO
PREVENT SURFACE AND AIR MOVEMENT OF DUST DURING CONSTRUCTION. MEASURES EMPLOYED SHALL BE IN ACCORDANCE WITH THE VESCH.
3.32
TABLE 3.32-D
SITE SPECIFIC SEEDING MIXTURES FOR PIEDMONT AREA
Total Lbs.
Per Acre
Minimum Care Lawn
- Commercial or Residential
175-200 this.
- Kentucky 31 or Turf -Type Tall Fescue
95-100%
- Improved ImpPerennialy g r Ryegrass rass
0.5%
- Kentucky Bluegrass
0.5%
High -Maintenance Lawn
200-250lbs.
- Kentucky 31 or Turf -Type Tall Fescue
100%
General Slop& (3:1 or less)
. Kentucky 31 Fescue
128 lbs.
. Red Top Grass
21bs.
- Seasonal Nurse Crop*
20 this.
150 lbs.
Low -Maintenance Slope (Steeper than 3, I)
. Kentucky 31 Fescue
108 lbs.
- Red Top Grass
2 lbs.
- Seasonal Nurse Crop*
20 lbs.
- Crownvetch ea
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
a. Substitute Sericea lespedeza for Crownvetch east of Farmville, Va. (May
through September use hulled Sericea, all other periods, use unbolted 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
pil Test of Aaricultural Limestone
below 4.2 3 tors per acre
41 to 5.2 2 tons per acre
52 to 6 1 tun per ame
TABLE 3JLB
ACCEPI"M TEMPORARY SEEDING P1ANT MATERIAIB
-QUICK REFERENCE FOR ALL REGIONS"
Rare
Plantim. One. q..d.3 (Mudd 1, )
Sept I - Feb. 15 50150 Mu M
Mari R rm.
11m1' Id-Rorum)
& so-100
Camal (winter) Rye
(s.nl. real.)
Feb.16 - Apr. 30 Annual R". 6R - 100
n olinm multi-Bnn,m)
May 1 . An, 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 PRACTCES WILL BE CONSTRUCTED AND MAINTAINED
ACCORDING TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE VIRGINIA
EROSION AND SEDIMENT CONTROL HANDBOOK AND VIRGINIA REGULATIONS VR
625-02-00 EROSION AND SEDIMENT CONTROL REGULATIONS.
ES-2. THE PLAN APPROVING AUTHORITY MUST BE N077FIED ONE WEEK PRIOR TO THE
PRE -CONSTRUCTION CONFERENCE, ONE WEEK PRIOR TO THE COMMENCEMENT
OF LAND DISTURBING AC77VITY, AND ONE WEEK PRIOR TO THE FINAL
INSPECTION.
ES-3: ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR
TO OR AS THE FIRST STEP IN CLEARING.
ES-4. A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL PLAN SHALL BE
MAINTAINED ON THE SITE AT ALL TIMES.
ES-5:PRIOR TO COMMENCING LAND DISTURBING 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 INSTALLATON OF ANY ADDIIONAL
EROSION CONTROL MEASURES NECESSARY TO PREVENT EROSION AND
SEDIMENTA7ON 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 STABILIZAT70N 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 fi11 shall be inert
materials only, free of roots, stumps, wood, rubbish, and other debris.
12. Borrow or waste areas are to be reclaimed within 7 days of completion per Zoning
Ordinance section 5.1.28.
13. All inert materials shall be transported in compliance with section 13-301 of the Code of
Albemarle.
14. Borrow, fill or waste activity involving industrial -type power equipment shall be limited to
the hours of 7:00am to 9:00pm.
15. Borrow, fill or waste activity shall be conducted in a safe manner than maintains lateral
support, or order to minimize any hazard to persons, physical damage to adjacent land and
improvements, and damage to any public street because o slides, sinking, or collapse.
16. The developer shall reserve the right to install, maintain, remove or convert to permanent
stormwater management facilities where applicable all erosion control measures required
by this plan regardless of the sale of any lot, unit, building or other portion of the property.
17. Temporary stabilization shall be temporary seeding and mulching. Seeding is to be at 75
lbs/acre, and in the months of September to February to consist a 50150 mix of Annual
Ryegrass and Cereal Winter Rye, or in March and April to consist of Annual Rye, or May
through August to consist of German Millet. Straw mulch is lobe applied at 80lbs/100sf.
Alternatives are subject to approved by the County erosion control inspector.
18. Permanent stabilization shall be lime and fertilizer, permanent seeding, and mulch.
Agricultural grade limestone shall be applied at 90lbs/1000sf, incorporated into the top 4-6
inches of soil. Fertilizer shall be applied at 1000lbs/acre and consist of a 10-20-10 nutrient
mix. Permanent seeding shall be applied at 180lbs/acre and consist of 95% Kentucky 31 or
Tall Fescue and 0-561c Perennial Ryegrass or Kentucky Bluegrass. Straw mulch is to be
applied at 801bs/l00sf. Alternatives are subject to approved by the County erosion control
inspector.
19. Maintenance: All measures are to be inspected weekly and after each rainfall. Any damage
or clogging to structural measures is to 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 necessaryto achieve a good stand of grass. Silt fence and diversion dykes
g g Y
which are collecting sediment to half their height must be cleaned and repaired
immediately.
20. All temporary erosion and sediment control measures are to be removed within 30 days of
final site stabilization, when measures are no longer needed, subject to approval by the
County erosion control inspector.
21. This plan shall be void if the owner does not obtain a permit within 1 year of the date of
approval. (Water Protection Ordinance section 17-204G.)
22. Permanent vegetation shall be installed on all denuded areas within nine (9) months after
the date the land disturbing activity commenced. (Water Protection Ordinance section 17-
20713)
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 DIS77,IRBED ARES THAT
WILL NOT BE BROUGHT TO FINAL GRADE WITHIN 30 DAYS.
PLANTS SHOULD BE SELECTED APPROPRIATE TO THE SEASON AND SITE COND177ONS FROM TABLES 331B
AND 3.31C. NOTE THAT TABLE 3.31B PRESENTS PLANTS WHICH CAN BE USED WITHOUT EXTENSIVE
EVALUATION OF SITE CONDITIONS; TABLE 331C PRESENTS MORE IN-DEPTH INFORMAT70N ON THE PLANT
MATERIALS.
TO CONTROL EROSION ON BARE SOIL SURFACES, PLANTS MUST BE ABLE TO GERMINATE AND GROW.
SEEDBED PREPARATION IS ESSENTIAL.
AN EVALUATION SHOULD BE CONDUCTED TO DETERMINE IF LIME IS NECESSARY FOR TEMPORARY SEEDING.
TABLE 331A MAY BE USED TO DETERMINE THE ACTUAL NEED ALONG WITH SUGGESTED APPLICATION
RA TES:
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, CUL77PACKER SEEDER OR
HYDROSEEDER. SMALL GRAINS SHALL BE PLANTED NO MORE THAN 1i INCHES DEEP. SMALL SEEDS, SUCH
AS KENTUCKY BLUEGRASS, SHOULD BE PLANTED NO MORE THAN 4 INCH DEEP. OTHER GRASSES AND
LEGUMES SHOULD BE PLANTED FROM J 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 &a SEDIMENT
CONTROL MEASURES:
EROSION AND SEDIMENT CONTROL MEASURES:
IT IS ANTICIPATED TO USE CONSTRUCTION ENTRANCES, DIVERSION DIKES, EXISTING SEDIMENT
BASINS, AND SILT FENCES WILL BE INSTALLED TO CONTROL SURFACE DRAINAGE. TEMPORARY
SEEDING WILL BE USED IMMEDIATELY FOLLOWING ALL LAND DISTURBANCE ACTIVITIES.
TEMPORARY STOCKPILE AREAS WILL BE MAINTAINED FROM TOPSOIL THAT WILL BE STRIPPED
FROM AREAS TO BE GRADED AND STORED FOR LATER SPREADING. STOCKPILE LOCATIONS SHALL
BE ON SITE AND SHALL BE STABILIZED NTH A TEMPORARY VEGETATIVE COVER. PERMANENT
SEEDING WILL BE PERFORMED FOR ALL AREAS WHICH WILL NO LONGER BE EXCAVATED AND
WHERE CONSTRUCTION ACTIO77ES HAVE CEASED. PERMANENT SEEDING SHALL ALSO BE
PERFORMED FOR ALL DENUDED AREAS WHICH WILL BE LEFT DORMANT FOR A YEAR OR MORE.
SELECTON OF SEED MIXTURE WILL DEPEND ON THE TIME OF YEAR APPLIED.
TEMPORARY SEEDING WILL BE PERFORMED FOR ALL DENUDED AREAS WHICH WILL BE LEFT
DORMANT FOR MORE THAN SEVEN DAYS. THESE AREAS SHALL BE SEEDED WITH FAST
GERMINA7NG VEGETATION IMMEDIATELY FOLLOWING GRADING OF THOSE AREAS. SELECTION OF
SEED MIXTURE WILL DEPEND ON THE TIME OF YEAR APPLIED.
CONSTRUCTION ENTRANCE:
A STABILIZED PAVED CONSTRUCTION ENTRANCE WITH A WASH RACK LOCATED AT POINTS OF
VEHICULAR INGRESS AND EGRESS ON A CONSTRUCTION SITE TO REDUCE THE AMOUNT OF MUD
TRANSPORTED ONTO PAVED PUBLIC ROADS BY MOTOR VEHICLES OR RUNOFF.
CONSTRUCTION ENTRANCES SHALL BE INSTALLED AS SHOWN ON THE PLANS TO REDUCE 77-IE
AMOUNT SEDIMENT TRANSPORTED ONTO PUBLIC ROADWAYS.
SILT FENCE.,
A TEMPORARY SEDIMENT BARRIER CONSISTING OF A SYNTHETIC FILTER FABRIC STRETCHED
ACROSS AND ATTACHED TO SUPPORTING POSTS AND ENTRENCHED. TO INTERCEPT AND DETAIN
SMALL AMOUNTS OF SEDIMENT FROM DISTURBED AREAS DURING CONSMUC77ON OPERA7ONS IN
ORDER TO PREVENT SEDIMENT FROM LEAVING 77-IE S17E. TO DECREASE THE VELOCITY OF SHEET
FLOWS AND LOW -TO -MODERATE LEVEL CHANNEL FLOWS. THE SILT FENCE BARRIERS SHALL BE
INSTALLED DOWN SLOPE OF AREAS WITH MINIMAL GRADES TO FILTER SEDIMENT LADEN RUNOFF
FROM SHEET FLOW AS INDICATED. THEY SHALL BE INSPECTED IMMEDIATELY AFTER EACH
RAINFALL AND MAINTAINED IN ACCORDANCE NTH THE VIRGINIA EROSION & SEDIMENT CONTROL
HANDBOOK (VESCH).
PERMANENT STABILIZATION:
THE ESTABLISHMENT OF PERENNIAL VEGETATIVE COVER ON DISTURBED AREAS BY PLANTING
SEED. TO REDUCE EROSION AND DECREASE SEDIMENT YIELD FROM DIS77JRBED AREAS. TO
PERMANENTLY STABILIZE DISTURBED AREAS IN A MANNER THAT IS ECONOMICAL, ADAPTABLE TO
SI7F CONDITIONS, AND ALLOWS SELECTION OF THE MOST APPROPRIATE PLANT MATERIALS. TO
IMPROVE WILDLIFE HABITAT. TO ENHANCE NATURAL BEAUTY. UPON COMPLETION OF
CONSTRUCTION ACTIVITIES, ALL AREAS WILL RECEIVE A PERMANENT VEGETATIVE COVER.
TEMPORARY SEEDING:
THE ESTABLISHMENT OF A TEMPORARY VEGETA7VE COVER ON DISTURBED AREAS BY SEEDING
WI774 APPROPRIATE RAPIDLY GROWING ANNUAL PLANTS. TO REDUCE EROSION AND
SEDIMENTATION BY STABILIZING DISTURBED AREAS THAT WILL NOT BE BROUGHT TO FINAL GRADE
FOR A PERIOD OF MORE THAN 30 DAYS. TO REDUCE DAMAGE FROM SEDIMENT AND RUNOFF TO
DOWNSTREAM OR OFF -SITE AREAS, AND TO PROVIDE PROTECTION TO BARE SOILS EXPOSED
DURING CONSTRUCTION UNTIL PERMANENT VEGETATION OR OTHER EROSION CONTROL MEASURES
CAN BE ESTABLISHED.
DUST CONTROL:
REDUCING SURFACE AND AIR MOVEMENT OF DUST DURING LAND DISTURBING, DEMOLITION AND
CONSTRUCTION ACTIVITIES.
TO PREVENT SURFACE AND AIR MOVEMENT OF DUST FROM EXPOSED SOIL SURFACES AND
REDUCE THE PRESENCE OF AIRBORNE SUBSTANCES WHICH MAY PRESENT HEALTH HAZARDS,
TRAFFIC SAFETY PROBLEMS OR HARM ANIMAL OR PLANT LIFE.
DUST CONTROL MEASURES SHALL BE EMPLOYED TO PREVENT SURFACE AND AIR MOVEMENT OF
DUST DURING CONSTRUCTION. MEASURES EMPLOYED SHALL BE IN ACCORDANCE WITH THE VESCH.
TEMPORARY DIVERSION DIKE:
A RIDGE OF COMPACTED SOIL CONSTRUCTED AT THE TOP OR BASE OF A SLOPING DISTURBED
AREA WHICH DIVERTS OFF -SITE RUNOFF AWAY FROM UNPR07ECTED SLOPES AND TO A
STABILIZED OUTLET, OR TO DIVERT SEDIMENT -LADEN RUNOFF TO A SEDIMENT TRAPPING
STRUCTURE. MAXIMUM EFFECTIVE LIVE IS 18 MONTHS.
ROCK CHECK DAMS:
SMALL, TEMPORARY STONE DAMS CONSTRUCTED ACROSS A DRAINAGE DITCH TO REDUCE THE
VELOCITY OF CONCENTRATED FLOWS, REDUCING EROSION OF THE SWALE OR DITCH. LIMITED TO
USE IN SMALL OPEN CHANNELS WHICH DRAIN 10 ACRES OR LESS, • SHOULD NOT BE USED IN
LIVE STREAMS.
STORM DRAIN INLET PROTECTION:
THE INSTALLATION OF VARIOUS KINDS OF SEDIMENT TRAPPING MEASURES AROUND DROP INLETS
OR CURB INLET STRUCTURES PRIOR TO PERMANENT STABILIZATION OF THE DISTURBED AREA;
LIMITED TO DRAINAGE AREAS NOT EXCEEDING ONE ACRE, AND NOT INTENDED TO CONTROL
LARGE, CONCENTRATED STORMWATER FLOWS.
TEMPORARY SEDIMENT TRAP:
A SMALL PONDING AREA, FORMED BY CONSTRUCTING AN EARTHEN EMBANKMENT WITH A STONE
OUTLET ACROSS A DRAINAGE SWALE, TO DETAIN SEDIMENT -LADEN RUNOFF FROM SMALL
DIS77JRBED AREAS FOR ENOUGH TIME TO ALLOW MOST TO THE SUSPENDED SOLIDS TO SETTLE
OUT MAXIMUM EFFECTIVE LIFE IS 18 MONTHS.
TEMPORARY SEDIMENT BASIN:
A TEMPORARY BARRIER OR DAM WITH CONTROLLED STORMWATER RELEASE STRUCTURES WHICH IS
FORMED BY CONSTRUCTING AN EMBANKMENT OF COMPACTED SOIL ACROSS A DRAINAGEWAY. IT
IS USED TO DETAIN SEDIMENT -LADEN RUNOFF FROM DRAINAGE AREAS 3 ACRES OR GREATER
FOR ENOUGH TIME TO ALLOW MOST OF THE SUSPENDED SOLIDS TO SETTLE OUT IT CAN BE
CONSTRUCTED ONLY WHERE THERE IS SUFFICIENT SPACE AND APPROPRIATE TOPOGRAPHY
MAXIMUM EFFECTIVE LIFE IS 18 MONTHS UNLESS DESIGNED AS A PERMANENT POND BY A
QUALIFIED PROFESSIONAL.
OUTLET PROTECTION:
THE INSTALLATION OF RIPRAP CHANNEL SECTIONS AND/OR STILLING BASINS BELOW STORM
DRAIN OUTLETS TO REDUCE EROSION AND UNDER-CUT77VG 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 DURING THE PHASE OF A PROJECT WHERE
ELEVATIONS AND DRAINAGE PATTERNS ARE CHANGING, CAUSING ORIGINAL CONTROL MEASURES
TO BE INEFFECTIVE.
SAFETY FENCE:
A PROTECTIVE BARRIER INSTALLED TO PROHIBIT UNDESIRABLE USE OF AN EROSION CONTROL
MEASURE.
PERMANENT STAB/L/ZAT/ON:
PERMANENT SEEDING WILL BE APPLIED TO ALL DISTURBED AREAS AS PER THE PERMANENT
STABILIZATION OF THIS EROSION & SEDIMENT CONTROL NARRATIVE.
AFTER CONSTRUCTION IS COMPLETED, ALL DISTURBED AREAS OF THE SITE WILL BE LIMED,
FERTILIZED, AND SEEDED AS PER CURRENT VDOT STANDARDS. THIS SHALL CONSIST OF
THE FOLLOWING:
TOP SOIL - 2" DEPTH
LIME - 2 TONS/ACRE
FERTILIZER - 600 LBS/ACRE OF 15-30-15
SEED - ERNST 5311 CONSERVATION SEED MIX - ERNMX-114 (45 LBS/ACRE PENNLAWN
CREEPING RED FESCUE, 37.5 LBS/ACRE ARGILS KEN77JCKY 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 ATTENT70N WILL BE GIVEN TO THE
FOLLOWING ITEMS
A. SEDIMENT BASINS AND/OR TRAPS WILL BE CLEANED AND MAINTAINED IN
ACCORDANCE WITH THE VIRGINIA EROSION & SEDIMENT CONTROL HANDBOOK.
B. ALL GRAVEL OUTLETS WILL BE CHECKED REGULARLY FOR SEDIMENT BUILDUP THAT
WILL PREVENT PROPER DRAINAGE. IF THE GRAVEL IS CLOGGED BY SEDIMENT THE
GRAVEL WILL BE REMOVED AND CLEANED, OR IT WILL BE REPLACED.
C. ALL SILT FENCE BARRIERS WILL BE CHECKED REGULARLY FOR UNDERMINING OR
DETERIORATION OF THE FABRIC AND REPAIRED AS REQUIRED. SEDIMENT SHALL BE
REMOVED WHEN THE LEVEL OF SEDIMENT DEPOSITION REACHED HALF WAY TO THE
TOP OF THE BARRIER.
D. ALL SEEDED AREAS WILL BE CHECKED REGULARLY TO SEE THAT A GOOD STAND IS
MAINTAINED. AREAS SHOULD BE FERTILIZED AND RESEEDED AS NEEDED.
EROSION CONTROL NOTES &" NARRATIVE
PURPOSE.•
THE PURPOSE OF THIS LAND DISTURBING ACTIVITY IS TO GRADE THE SPRING HILL VILLAGE SITE FOR
FUTURE DEVELOPMENT. THE TOTAL AREA TO BE DISTURBED WITH THIS PHASE OF DEVELOPMENT IS
4.36 ACRES.
EXIS77NG SI7E CONDITIONS
PART OF THIS SITE HAS A WOODS GRASS COMBINATION AND SLOPES TO THE SOUTH-EAST THE
SITE IS LOCATED TO THE NORTH OF AVON STREET EXTENDED. THE MAJORITY OF THE SITE DRAINS
TO AN EXISTING ROADSIDE DITCH OFF OF AVON STREET EXTENDED WHILE THE BACK WESTERN
PORTION OF THE SITE DRAINS OFFSITE. CURRENTLY, THERE IS (1) EXISTING HOUSE ON THE
PROPERTY THAT WILL REMAIN AND EXISTING CONCRETE SLABS AND STRUCTURES TO REMAIN.
ADJACENT AREAS:
THIS SITE IS BORDERED TO THE EAST BY AVON STREET EXTENDED AND TO THE WEST BY VIRGINIA
CONSERVATION LAND. RESIDENTIAL DWELLINGS EXIST TO THE NORTH AND SOUTH.
OFFSITE LAND DISTURBANCE:
IMPROVEMENTS TO BE MADE WITHIN THE VDOT RIGHT-OF-WAY ALONG AVON STREET EXTENDED AND
A CONNECTION TO EXISTING VDOT RIGHT-OF-WAY HATHAWAT STREET.
CRITICAL AREAS:
TREE PROTECTION FENCING AND SILT FENCE SHALL BE MAINTAINED ALONG THE PROPERTY LINES TO
THE EAST, NORTH, AND SOUTH OF THE SITE TO PROTECT THE ADJACENT PROPERTIES. CONTRACTOR
SHALL ENSURE THAT ALL SEDIMENT MAINTENANCE CONTROLS ARE ALONG AVON STREET EXTENDED
TO ENSURE THAT NO SEDIMENT LEAVES THE SITE AND DRAINS ONTO AVON STREET EXTENDED.
SOILS
SOILS MAP IS INCORPORATED INTO EROSION CONTROL PLAN PHASE I WITH SOILS DATA INCLUDED
WITH THIS NARRATIVE.
SEQUENCE OF CONSTRUCTION:
PHASE l:
1. NOTIFY ALBEMARLE COUNTY TO SCHEDULE A PRE -CONSTRUCTION MEETING AS REQUIRED.
2. PRIOR TO DISTURBANCES, THE LIMITS OF DISTURBANCE SHALL BE FLAGGED AND THE TREE
PROTEC77ON FENCING SHALL BE INSTALLED.
J. NO EROSION CONTROL MEASURES MAY BE REMOVED DURING THE CONSTRUCTION PROCESS
WITHOUT THE APPROVAL FROM THE INSPECTOR ON THE PROJECT.
4. THE PROPOSED CONSTRUCTION ENTRANCE WITH WASH AREAS SHALL BE INSTALLED AS SHOWN ON
THE PLANS. THE CONSTRUCTION ENTRANCE TO BE INSTALLED WHERE CONSTRUCTION VEHICLE
ROUTES INTERSECT PAVED PUBLIC ROADS, PROVISIONS SHALL BE MADE TO MINIMIZE THE
TRANSPORT OF SEDIMENT BY (VEHICULAR) TRACKING ONTO THE PAVED SURFACE. WHERE
SEDIMENT IS TRANSPORTED ONTO A PUBLIC ROAD SURFACE, THE ROAD SHALL BE CLEANED
THOROUGHLY AT THE END OF EACH DAY. SEDIMENT SHALL BE REMOVED FROM THE ROADS BY
SHOVELING OR SWEEPING AND TRANSPORTING TO A SEDIMENT CONTROL DISPOSAL AREA. STREET
WASHING SHALL BE ALLOWED ONLY AFTER SEDIMENT IS REMOVED IN THIS MANNER.
5. INSTALL THE INITIAL CONSTRUCTION MEASURES AS SHOWN ON THE PHASE I EROSION CONTROL
SHEET. THIS INCLUDES (2) SEDIMENT TRAPS, WIRE SILT FENCE, AND DIVERSION DIKES.
MEASURES INTENDED TO TRAP SEDIMENT SHALL BE CONSTRUCTED AS A FIRST STEP WITH ANY
LAND DISTURBANCE ACTIVITY AND SHALL BE MADE FUNCTIONAL BEFORE UPSLOPE LAND
DISTURBANCE TAKES PLACE.
6. ONCE ALL THE PHASE I EROSION CONTROL ITEMS HAVE BEEN INSTALLED AS SHOWN ON THE
EROSION CONTROL PHASE I PLAN AND THE INSPECTOR HAS APPROVED THE EROSION CONTROL
MEASURES, THE CONTRACTOR CAN BEGIN THE MINIMUM GRADING OPERATIONS. STABILIZATION
MEASURES SHALL BE APPLIED TO EARTHEN STRUCTURES SUCH AS DAMS, DIKES, AND DIVERSIONS
IMMEDIATELY AFTER INSTALLATION. GRADING ALONG THE PERIMETER OF THE SITE THAT BACKS UP
TO AVON PARK I IS OF PRIORITY FOR INSTALLATION OF SCRIM FENCE AND LANDSCAPE BUFFERING
BEFORE ANY OTHER GRADING OPERATIONS.
7. PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN
SEVEN DAYS AFTER FINAL GRADE IS REACHED ON ANY PORTION OF THE SITE. TEMPORARY SOIL
STABILIZATION SHALL BE APPLIED WITHIN SEVEN DAYS TO DENUDED AREAS THAT MAY NOT BE AT
FINAL GRADE BUT WILL REMAIN DORMANT (UNDISTURBED) FOR LONGER THAN 30 DAYS.
PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR
MORE THAN ONE YEAR.
PHASE IIA:
8. THE FIRST PART OF PHASE 11A SHALL BE TO CONSTRUCT THE OUTFALL OF SEDIMENT BASIN 1. THE
SEDIMENT BASIN SHALL OUTFALL ALONG THE OUTLET PROTECTION (RIPRAP) INTO THE EXISTING
ROADSIDE DITCH ALONG AVON STREET EXTENDED. ONCE STR-3A HAS BEEN INSTALLED THE
CONTRACTOR SHALL TIE THE TEMPORARY BARREL INTO THE PERMANENT STR-3A.ONCE OUTFALL
IS CONSTRUCTED, SEDIMENT TRAP 1 CAN BE CONVERTED TO SEDIMENT BASIN 1.
9. ONCE SEDIMENT BASIN 1 HAS BEEN APPROVED BY INSPECTOR THE CONTRACTOR CAN BEGIN
ROUGH GRADING THE SITE TO THE CONTOURS SHOWN ON THE EROSION CONTROL PHASE IIA PLAN.
10.PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN
SEVEN DAYS AFTER FINAL GRADE IS REACHED ON ANY PORTION OF THE SITE. TEMPORARY SOIL
STABILIZATION SHALL BE APPLIED WITHIN SEVEN DAYS TO DENUDED AREAS THAT MAY NOT BE AT
FINAL GRADE BUT WILL REMAIN DORMANT (UNDISTURBED) FOR LONGER THAN 30 DAYS.
PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR
MORE THAN ONE YEAR.
PHASE 11B.
11. AFTER ROUGH GRADING OPERATIONS ARE COMPLETE, CONTRACTOR CAN BEGIN INSTALLING THE
ROAD AND DRAINAGE STRUCTURES AS SHOWN ON THE PLAN. INLET PROTEC77ON SHALL BE
INSTALLED AS SHOWN ON THE PLAN. DRAINAGE STRUCTURES SHALL OUTFALL INTO THE SEDIMENT
BASIN UNTIL THE SITE IS STABILIZED.
12.SEDIMENT TRAP 2 SHALL BE UPSIZED TO SEDIMENT TRAP 3 ONCE SEDIMENT BASIN 1
INSTALLATION IS COMPLETE AND APPROVED.
PHASE TIC:
13.AT THIS POINT THE CONTRACTOR, CAN INSTALL PERIMETER CONTROLS AROUND THE LOWER
PORTION OF THE SITE, INCLUDING WIRE SILT FENCE AND TREE PROTECTION. ONCE PHASE TIC
EROSION CONTROLS HAVE BEEN INSTALLED AS SHOWN ON THE PLAN AND THE INSPECTOR HAS
APPROVED THE EROSION CONTROL MEASURES, THE CONTRACTOR CAN BEGIN GRADING OPERATIONS
ALONG THE ASPHALT EMERGENCY ACCESS ROAD/DRIVEWAY ON THE LOWER PORTION OF THE SITE.
STABILIZATION MEASURES SHALL BE APPLIED TO EARTHEN STRUCTURES SUCH AS DAMS, DIKES,
AND DIVERSIONS IMMEDIATELY AFTER INSTALLATION.
14. AS THE ROAD IS CONSTRUCTED, THE CONTRACTOR IS TO ENSURE THE EXISTING SINGLE FAMILY
HOME HAS ACCESS TO AVON STREET EXTENDED. THE CONTRACTOR SHALL ALSO ENSURE THE
SAFETY FENCE AND WIRE SILT FENCE SHALL SURROUND THE PORTION OF THIS LOT THAT IS NOT
TO BE DISTURBED.
15. PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN
SEVEN DAYS AFTER FINAL GRADE IS REACHED ON ANY PORTION OF THE SITE. TEMPORARY SOIL
STABILIZAT70N SHALL BE APPLIED WITHIN SEVEN DAYS TO DENUDED AREAS THAT MAY NOT BE
AT FINAL GRADE BUT WILL REMAIN DORMANT (UNDISTURBED) FOR LONGER THAN 30 DAYS.
PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS THAT ARE TO BE LEFT DORMANT FOR
MORE THAN ONE YEAR.
PHASE Ill:
16.ONCE THE SITE IS STABILIZED AND THE INSPECTOR HAS GIVEN APPROVAL, THE CONTRACTOR
CAN REMOVE THE SEDIMENT BASIN AND SEDIMENT TRAP. NO ITEM SHALL BE REMOVED UNLESS
THE UPSTREAM AREAS ARE STABILIZED AND THE INSPECTOR GIVES PERMISSION. AT THE 77ME OF
TEMPORARY SEDIMENT BASIN #1 "S REMOVAL AND THE INSTALLATI0N OF THE PERMANENT STORM
SEWER SYSTEM, THE CONTRACTOR SHALL REMOVE THE TEMPORARY BARREL CONNECTION INTO
PERMANENT STR-3A AND PLUG ITS OPENING WATERTIGHT 0
17MAINTAIN ALL EROSION CONTROL MEASURES AS SPECIFIED IN THE VIRGINIA EROSION AND
SEDIMENT CONTROL HANDBOOK, REMOVING ONLY WHEN APPROVED BY THE LOCAL PROGRAM
ADMINISTRATOR IN ACCORDANCE WITH THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK.
18.ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES SHALL BE REMOVED WITHIN 30
DAYS AFTER FINAL SITE STABILIZATION OR AFTER THE TEMPORARY MEASURES ARE NO LONGER
NEEDED, UNLESS OTHERWISE AUTHORIZED BY THE LOCAL PROGRAM ADMINISTRATOR. TRAPPED
SEDIMENT AND THE DISTURBED SOIL AREAS RESULTING FROM THE DISPOSITION OF TEMPORARY
MEASURES SHALL BE PERMANENTLY STABILIZED TO PREVENT FURTHER EROSION AND
SEDIMENTATION.
SOIL DESCRIPTION
77B -RABUN CLAY LOAM-29e TO 79 SLOPES. THESE DEEP, WELL DRAINED SOILS ARE FOUND ON
GENTLY SLOPING TO STEEP RIDGES AND MOUNTAIN SLOPES. MODERATE TO RAPID RUNOFF, WITH
MODERATE PERMEABILITY.
71C -RABUN CLAY LOAM-77. TO 157 SLOPES. THESE DEEP, WELL DRAINED SOILS ARE FOUND ON
GENTLY SLOPING TO STEEP RIDGES AND MOUNTAIN SLOPES. RAPID RUNOFF, WITH MODERATE
PERMEABILITY.
iCOTT/R. CI1•LLINSZ
Lic. No. 0357911'n
IL 10/19/20 w4j
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72C3 - RABUN CLAY LOAM-77 TO 157 SLOPES. THESE DEEP, WELL DRAINED SOILS ARE FOUND ON cU
GENTLY SLOPING TO STEEP RIDGES AND MOUNTAIN SLOPES. MODERATE TO RAPID RUNOFF, I w
NTH MODERATE PERMEABILITY.
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STORMWATER RUN-OFF CONSIDERATIONS: I ■ ■ ■ ■ 1 112066
STORMWATER MANAGEMENT. THE STORMWATER RUNOFF FROM THIS PROJECT DRAINS TEMPORARILY TO SCALE
THE SEDIMENT BASIN & TRAP. THE SEDIMENT BASIN AND THE SEDIMENT TRAP WILL BE REMOVED AFTER
THE DEVELOPMENT OF THE AVON PARK Il PROJECT AS NOTED
SHEET NO.
3
1IRGIN/A EROSION & SEDIMENT
EROSION CONTROL * HANDBOOK SPECIFlCA770N NUMBER CONTROL
NOTE: SLOPES
GREATER THAN 3:1 SHALL BE PLANTED I l / / I i i
/
TH
E MIX WITH
SA
SAFETY FENCE
3.01
BY ERNST CONl
CE
CONSTRUC77ON EN7RANCE
3.02
OFI60ABS
SPECIFIED
PER ACRE, RP7RVATIONSEED§A
PER I, 00 UL, ESSTERYEGRASS
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3.14
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SCRIM FENCE TO BE INSTALLED
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\ INSTALLED, OPERATED, AND MAINTAINED BY THE I Lu Ln
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SOIL TYPE I I
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72
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CURRENT RESIDENT OF EXISTING
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TREE PROTECTION SHALL BE INSTALLED ; CONSTRUCTION CONTRACTOR
AT LIMITS OF DISTURBANCE. THESE ARE I I I SHALL PROVIDE ALTERNATE G\APIf IC S ALE / JOB No.
FFSET FOR GRAPHICAL PURPOSES. \ V I TEMPORARY ACCESS FOR 112066
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s
LIMITS OF DISTURBANCE OR DIVERSION \ I % I II 1
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I V / V A \ I I I / (/ IN FEE ) SHEET NO.
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RGINIA EROSION SEDIMENT CON
if
EROSION CONTROL * HANDBOOK SPECIFlCA770N NUMBER 7ROL I I (I I 11 V
SA SAFETY FENCE 3.01 � 00 �/ �� �� �
CONSTRUCAON EN772ANCE J.
\ I v DD ih� SAF h� h h TP �o / / / / /SCOTT R. LINSX
CE
CR CR CONSTRUCTION ROAD STABILIZATION 3.03 _ CDLic. No. 035791,E
F °�o� 12/3/20�4
SF SILT FENCE 3.05
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lP STORM GRAIN INLET PROTECT/ON 3.07 \ � � � � � � I � � I I I �
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ST SEDIMENT TRAP 3.13
SB SEDIMENT BASIN 3.14
OP OUTLET PROTECTION J. O FD M z z
RR RIPRAP 3.19 O O
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CD UTILITY STREAM CROSING 3.25 I OUTAREA
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INSTALLED, OPERATED, AND MAINTAINED BY THE
a2'x O' MIN. m m
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AREA SHALL UTILIZE THIS C N�S�TR CTION ENTRANCE. a � awc wc
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FINAL LANDSCAPE BUFFER AREA TO BE PROPOSED SAFETY FENCE
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GRADING OF THE AREA IS COMPLETE LOCATION OF SCRIM FENCE � I m o cc
INSTAL�ED PER PROFFER 20IN O _ V �� A w ct) 0,n v
CONTRACTOR STAGING AREA
y WITH FUELING TANK, DUMPSTER,, 0" w ^
CS AND PORTA-POTTIES
ID
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SUPPORT SHALL BE AT LEAST 24INCHES / w N oN N
I
BUT NO GREATER THAN 34 ¢ � o
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/\N FEET. HEIGHT MAXIMUM
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i i i i i i i i i � i i � i � � -� y y� � SUPPORT SHALL BE AT LEAST 241NCHE5 �` � \ 1 z
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B SILT FENCE
I I ♦ ♦ � 1, � �, x I \ sF`� w1WI Q
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RAINAGE DIVIDE (TYP.) SAF PROPOSED LIMITS
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FOR
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— /�
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/ w
/ / / w
DURING CONSTRUCTION OF
NOTE: POST SPACING SHALL BE A i O w
� NOTE: SILT FENCE, SAFETY FENCE, AND I ASPHALT DRIVEWAY, � �
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SHALL BE AT LEAST 24INCHES JOB NO.
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BUT NO GREATER THAN 34 112066
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INCHES. - 30 I I I so ieo
/ i � Lil
A � � � ' � I SCALE
DRAINAGE DIVIDES ARE MEASURED AT THE
/ LIMITS OF DISTURBANCE OR DIVERSION
/ u I
DIKE. / I 1 - 30
IN FEE ) � SHEET NO.
1 I �� I I tch = 0 ft. 7
RGINIA EROSION SEDIMENT CON
if
EROSION CONTROL * HANDBOOK SPECIFlCA770N NUMBER 7ROL I I (I 1 11 IV
SA SAFETY FENCE 3.01�o � oo �'y,�
000NSTRUCAON EN772ANCE 3.02 I I O y h a° h� m lm oSCOTT R. LINSX_
CR CR CONSTRUCTION ROAD STABILIZATION 3.03 DD /SAF TP h I _ Lic. No. 035791
I A �� 12/3/20
SF SILT FENCE 3.05
SSTONAL Q
lP STORM GRAIN INLET PROTECT/ON 3.07
DD �110, TEMPORARY DIVERSION DIKE 3.09 I �� I I I I I —► �1 _ _ _ Op 1 \
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► �--�� TEMPORARY ROW DIVERSION 3.11 I I S 1
�j� � ( � 24" -MP
ST SEDIMENT TRAP 3.13 / I I I I
SB SEDIMENT BASIN 3.14 / _ _ _ I I \
OP OUTLET PROTECTION 3.18 \ 1 I ! T Ln Ln
I \ V DID �� \ FD M \ \ w w
RR RIPRAP 3.19 I \ 2
V CONCRETE WASH \ IA O O
CD ` _ UTILITY STREAM CROSING 3.25 \ OUTAREA I - V, z
III I ��1 �� 1 �� v \ ,\ Z F- Koo
TS TS TEMPORARY SEEDING 3.31 i I 1 _ \ m w w
C
LU U) J J
PS PS PERMANENT SEEDING 3.32 z
o r m m
MU MU MULCHING 3.35 I I I 1 AA \ X� WASH RACI \ m z
i W Of
w w w
TREE PROTECTON 3.38 _ A �� DD A NO E: T IS CONStRUC IO'N ENTR�NCE 5 ALL BE \
kD INSTALLED, OPERATED, AND MAINTAINED BY THE Ln �
\ EXISTING GRAVEL ROAD Aiz'x o' MIN. �.
TOR. ALL CONSTRUCTION TRAFFIC IN THIS > >
\ CE 7 CONTRAC I
DC DC DUST CONTROL 3.39 I I I \ TO SERVE AS CONSTRUCTION AREA SHALL UTILIZE THIS C NSTR CTION ENTRANCE. I I awc awc
SITE ACCESS ROAD \ \ \ \ \ � \ 1 I I
BM SOIL STABILIZATION BLANKET 3.36 00
PROPOSED SAFETY FENCE
FINAL PLANTED AS SOON AS CLEARING TO BE I I \ \ + PROPOSED
SEDIMENT
0 0 I
* * * * * GRADING OF 7HE AREA IS COMPLETE LOCATION OF SC IM FENCE 0D I 100 / STAGING ^
Q \ 1 �
\ INSTALLED PER PROFFER 201N �� ��
A CONTRACTORGINGAREA \
\ I I WITH FUELING TANK, DUMPSTER,O Dom, 01 ^ I \ 1 I I 1
\ �CS AND PORTA-POTTIESID ID
1
rn 00 NOTE: POST SPACING SHALL BE A
�13w/WIRE MAXIMUM OF 8 FEET. HEIGHT
I v I SUPPORT SHALL BE AT LEAST 241NCHE5 / I 1 J o o
\ BUT NO GREATER THAN 34 / ¢ � o
VDOTS DBARR — /
N
�\ ICADE I�\ INCHES. o
-e9z, 00 "
x� x
4 �ILOCA ON OF SCRIM
9 I� � 1 (FENCE I STALLED PER L9 � I
X PROFFE io IN PHASE I
\ / \ 66 o M
0 0 0 O� o o M
y6"hD' h CA
1 N 9 lI TP 662 3o FOOT LONG AND 00 N
I \ D .°'o 6 \ 1 - C7
1Iron 1 \ S „ 1 6gk 6Ba / 6 FOOT HIGH BAFFLES 1 1 \ I a� \ \ �� / DD / SA M Z
1
310 03 3.Q0' - = Q
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5.262 AC
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6' WIDE TOP 0 \ I U M I P i DAM z
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W
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NOTE. O
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PROPOSED SAFETY FENCE
AROUND SEDIMENT BASIN
o X X�iV40FOOTLONGAND I�c V Q
W
I sLJL
IP 6 FOOT HIGH BAFFLES
�� 1 \ IP - GRAVELCONSTRUCTION \ \
SITE
E� ACCESS
CCE_SS- ROAD EXISTING GRAVEL ROAD
� %\ i
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TO SERVE AS CONSTRUCTION - O W
I
SITE ACCESS ROAD
TS W > i
0 Z Lu Q u
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MU A MU Ix �. ', - L DA�TO S�= 0. S AC
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X i + i i �i 7i �i
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1 I I \ Q
1 W
PRO OSED TEM ORARY � 0 0
N O
Mu I o
1 \ � � � STOCK ILE SURR UNDE `�
BYSIL FENCE ��II� ����'- 1 wWI L
686 1/
i �� ♦ /SFj SUPP` C7
1 NOTE: DRIVEWAY ACCESI S TO
I
O
I
i AVON ST EXT SHALL BE
O
V �8 fr MAINTAINED AT ALL TIMES FOR i N
o b 0 0 6 ro N o Co w N o w w .t ry o co EXISTING SINGLE FAMILY HOME. y(0 a a ry o 00 w
I \ 'D 'D iD �n in m n ry N N H
G �\ 69 �� `b� W 00 / ^ ^ O `D ,D w w w w w DURING CONSTRUCTION OF o w w w
I 1 \ SAF / / / PROPOSED ANCE (TYP) I I NOTE: CONTRACTOR 1 DISTURBANCE E DRAINAGE ASPHALT DRIVEWAY,
� RAINAGE DIVIDE (TYP.) � \ � � DD TOR TO ENSURE CONTRACTOR
TOEMPORARY ACCESS
S;� w/WIRE y DIVERSION DIKE
V A / OF DISTUR POSTIV E ALONG
SUPPORTFOR
1 / RESIDENT G
W w
NOTE: POST SPACING SHALL BE A _ J /LU
/ NOTE: SILT FENCE, SAFETY FENCE, AND
MAXIMUM OF 8 FEET. HEIGHT � \ / TREE PROTECTION SHALL BE INSTALLED j
SHALL BE AT LEAST 24INCHE5 / JOB No.
BUT NO GREATER THAN 34 i OF LIMITS R DISTURBANCE. POSES ARE I I ' G API IC S ALE /
�V / � , � OFFSET FOR GRAPHICAL PURPOSES. � I I / � 112066
INCHES. _� - ! DRAINAG E DIVI DES ARE M EASURED AT THE I �30 0 �5 30 eo 120
/ LIMITS OF DISTURBANCE OR DIVERSION SCALE
1„ _ 30,
DIKE.
IN FEE ) SHEET NO.
1 �nch - ft. 8
RGINIA
EROSION CONTROL * HANDBOOK O ION ICI SEDIMENT
NUMBER 1ROL WITH NAT ES GREATER THAN 3:1 SHALL
STEEP SLOPE MIX WITH ANBE PLAN ED I /
/ SF w/WIRE ,,��� `TH
SA SAFETY FENCE 3.01 RYOEGRASS BY ERNST CONSERVATION SEEDS AT A RATE I l I / I I / SUPPORT / \ I I / / / / / / / ` OF��
OF 60 LBS. PER ACRE, OR 1 LB PER 1,000 SF, UNLESS oo N/
CE CONSTRUCTION ENTRANCE 3.02 SPECIFIED OTHERWISE. j I l I ° y\ o ° h� h SCOTT R. LINSX
CR CR CONSTRUCTION ROAD STABILIZATION 3.03 / / / I I I I I I I I \ \ \ \ / T / SAF TP CD Lic. No. 035791,E
RIP RAP CHANNEL / / F dT 12/3/20 c�4
Z SEE CALCULATIONS PACKET / / 0
SF �� SILT FENCE 3.05 /, � I / � I I I I I ,c�SSI
lP STORM DRAIN INLET PROTECTION 3.07 \ I / I I I I I 1 -x-x / ONAL E
I I 0
DD �� TEMPORARY DIVERSION DIKE 3.09
I
TEMPORARY ROW DIVERSION 3.11 24" CVP 1
ST SEDIMENT TRAP 3.13
4)11
r90 \ \ o
SB cip
SEDIMENT BASIN 3.14 / / _ I I I \ 1 \ \ IP 8 I I N
OP OUTLET PROTECT70N 3.18 7,/,/
z z
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CD �_ UTILITY STREAM CROSING 3.25 i I I OUTAREA\, v z
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TS TS TEMPORARY SEEDING 3.31 i I \ U m w w
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0 Q Q
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MU MU MULCHING 3.35 w w w
7P TREE PROTEC770N 3.38 I \ \ V\ NO E: T IS CONStRUC I6`N ENTRANCE S ALL BE W
C 1
\ I I D \ \ INSTALLED, OPERATED, AND MAINTAINED BY THE
DC DC DUST CONTROL 3.39 \ I I _ \ \ \ \ \ \ CE 1zk70' MIN. CONTRACTOR. ALL CONSTRUCTION TRAFFIC IN THIS I I > >
AREA SHALL UTILIZE THIS C NS,TR CTION ENTRANCE. I I awc awc
BM SOIL STABILIZA77ON BLANKET 3.36 I \ \ \ \ \ \ \ \ \ \ I
FINAL LANDSCAPE BUFFER AREA TO BE
0
PLANTED AS SOON AS CLEARING AND \ \ \ ��
GRADING OF THE AREA IS COMPLETE LOCATION OF SC IM FENCE 00 I 140 � 0 co
\ y
I
INSTALL PER PROFFER zo IN
CONTRACTOR STAGING AREA �. 0 �
WITH FUELING TANK, DUMPSTER,� ar ^ I
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ID
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SUPPORT SHALL BEAT EATTLEASTz4UM OF8 FEET. FEIGHT INCHES LOCI ON A SCRIM
NO E: OST SPACING�HALL BE A
w/WIRE
I I 94 FENCE I STALLED PER
BUT NO GREATER THAN 34 PROFFE to IN PHASE I
` INCHE PROPOSED LIMITS OF
I I I 1 I \
� \ � � \ DISTURBANCE = 4.25 ACRES M
N 6or
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MAXIMUM OF 8 FEET. HEIGHT 620 VA T v Y
I � SHALL BEAT LEAST zy INCHES � � W
IF O THAN _ 4 IP IP o BUT NO GREATER 3y
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\ I 86 TP SAF �� -!� 1O N o co 0 ° CO4' AVON ST EXT SHALL BE 0 b " ° 00 ° N
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PROPOSED LIMITS I I MAINTAINED AT ALL TIMES FOR --
69 / ^ OF DISTURBANCE EXISTING SINGLE FAMILY HOME. l' w/WIRE
I I /
E (TYP.) DURING CONSTRUCTION OF SF SUPPORT
I \ - _ _ - / I ASPHALT DRIVEWAY, NOTE: PO S S ACING SHALL BE A� /
Z i CONTRACTOR SHALL PROVIDE F MAXIMUM OF 8 FEET. HEIGHT / /
NOTE: SILT FENCE SAFETY FENCE AND I ALTERNATE TEMPORARY ACCESS / ce w
TREE PROTECTION SHALL BE INSTALLED FOR RESIDENT
SHALL BEAT LEAST zy INCHES a
BUT NO GREATER THAN 34
12 NO.
� � I I I CHES, � G AP�Ic s ALE/ JOB"TREE
LIMITS OF DISTURBANCE. THESE ARE
I I / FFSET FOR GRAPHICAL PURPOSES. I IIZOSG
DRAINAGE DIVIDES ARE MEASURED AT THE 30 0 e ao eo 20
I I SCALE
LIMITS OF DISTURBANCE OR DIVERSION I
I I I DIKE. i 1�� = '10 / �I IN FEE ) � SHEET NO.
/ / /I I I tch = C ft. / / 9
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/ N O D� N Table 16: Sediment Trap design (spec 3.13)
I
I
Lo
ID
I - s
LDS - 1 10' WIDE
- i
Sediment Trap design #1
drainage area (acres) (< 2 ac)
1.96
'
YARM9E'
trap volumes:
aNDEta CREST OF STONE WEIR
yMNABLE*
elevation (ft) area (so volume(cf)
wlume(cy)
CROIIND
632.00 1328.0 0
0.0
ELEV.
°
634.00 1944.0 3,252
120.5
DRYSTORAGE -
VARMBLE
636.00 2661.0 7,839
290.3
638.00 3478.0 13,960
517.0
0 0 0
0.0
WET STORAGE
WCAvuEO)
4
FLTER CLOTI CRIGNAL
DICwxO
am.
wet storage:
•5EE PLATE 113-1
COARSE AaR1ECAlE� CLASS I R~
wet storage required (cy) (67*DA*1.2)
157.6
bottom of stone weir (ft)
634.44
wet storage provided at this elevation (cy)
157.6
slope of wet storage sides
2:1
weir length (ft) (6xDA)
11.8
dry storage:
bottom of trap elevation (ft)
632
dry storage required (cy) (67*DA*1.2)
157.6
bottom trap dimensions:
30'X45'
crest of stone weir
636.2
top of dam elevation (ft)
638
dry storage provided at this elevation (cy)
157.6
top width of dam (ft)
10,
slope of dry storage sides
2:1
top trap dimensions
5411
Sediment Trap design #2
drainage area (acres) (< 2 ac)
0.71
1'
VARIABLE
trap volumes:
ORDINAL CREST OF STONE WEIR YARRAiILE*
elevation (ft) area (so volume(cf)
volume(cy) GROUND
588.5 822
0
¢w.
0.0
590 1200
1,508
55.8 DRY STORAGE - N
VAADELE
592 2006
4,679
173.3
0 0
0
0.0
0 0
0
0.0 WET STORAGE
V MAY
(EX"TED)
FILTER CLOTH ORIGINAL
dry storage provided at this elevation (cy) 57.1 top width of dam (ft) 6'
slope of dry storage sides 2:1 top trap dimensions 41'1 I ❑❑ /
x .
iLROAD �'X _
Sediment Basin Design #1 SEDIMENT TRAP #2 DETAIL
SCALE: 1"=20'
MIN.1'WIVLLWAY CREST OF EMERGENCY
drainage area (acres) 2.75 rIMTNOUT SPILLWAY
basin volumes: (using 2' contour intervals) DESIGN XIGX WATER
elevation (ft) contour area (so volume(cy) (25-' STORM ELEV)
632.00 1328.0 0 °s'
--------------
PROPOSED TEMPORARY 634.00 1944.0 120 MIN , D� CRMT
63 RI ON �ry 636.00 2661.0 290 °R STOKE oEWATLRNc I AT TIME OF TEMPORARY SEDIMENT TRAP#i'S -
c °' PORARY z ' CMP RISER RIM ELEV- �vCE
rn 4' - / ti / REMOVAL, THE CONTRACTOR SHALL REMOVE THE
° 7.79'. RISER TO INCLUDE A 6" DEWATERING N �y 638.00 3478.0 517 wET . RAGE TEMPORARY BARREL CONNECTIONS INTO
ORIFICE (INV ELEV.=635.i8) & A TEMPORARY AT TIME OF TEMPORARY SEDIMENT BASIN #>'S 0.00 0.0 0 PERMANENT STIR. i AND OUT OF
t TRASHRACK. RISER SHALL BE FIRMLY ANCHORED REMOVAL, THE CONTRACTOR SHALL REMOVE THE 0.00 0.0 0 PERMANENT STR.& PLUG ITS OPENING
SEDIMENT CLEANCUT POINT
Z Lo I TO PREVENT FLOATING. RISER TO BE SET IN A TEMPORARY BARREL CONNECTION INTO (' WET' STORAGE RERDUCED / WATERTIGHT
Z / / I � I MINIMUM OF 30" OF COMPACTED SOIL OR PERMANENT STIR. 0.0 0 TO G.Y./ ACR
. 3A &PLUG ITS OPENING \ \
61A / / I o I I AGGREGATE VASE OVER A 8'X8'XY4" THICK WATERTIGHT TEMPORARY CONNECTION FROM PERMANENT
6h o FOOT LONG AND m GALVANIZED STEEL BASE PLATE OR SET 6" STR-2 TO PERMANENT STR-i.
o � �
° 66� 6 4f � % �
3 o a INTO AN 8'X8'Xi8" THICK REINFORCED wet storage: % i z TEMPORARY CMP INV OUT= 8 6z FROM STR-2;/
�G 6 FOOT HIGH BAFFLES n / 5" 5 7
1 CONCRETE FOUNDATION. NOTE, IF STEEL BASE / wet storage required (cy) (67*DA*1.2) 221 design high water 638.79 INV IN-587.iiTO TEMPORARY STR-A; SLOPE=i.33%
IS USED SPECIAL ATTENUATION SHALL BE GIVEN \ / dewatering orifice elevation (ft) 635.18 top of dam (ft) 639.79 / 15" TEMPORARY CMP INV OUT=S87.oi FROM STR-A;
NO COMPACTION SO THAT 95%COMPACTIO 1 IS wet storage provided at this elevation (cy) 221 top width of dam (ft) 6.0 0 o INV IN=586.24 TO PERMANENT STR-1; SLOPE=i.33%
available volume before cleanout (cy) (34*DA) 94 bottom of basin (ft) 632.0 Lo �o (0 AF m ry
S rn
x cleanout elevation (ft) 633.53 approx. bottom dimensions. 45k30' ( DID / h 4 TP 0 /
.. �. P
-x-x-x-x-k-x distance from cleanout to orifice (ft) (> 1') 1.66 upstream face slope: 2:1
Mm-WMM- downstream face slope: 2:1
dry storage:
PROPOSED i2' CLASS I DA TO ST 3 = 0.73. AC dry storage required (cy) (67*DA*1.2) 221 baffles: YES
RIPRAP EMERGENCY principle spillway crest (ft) 637.79 length of flow, L (ft) 90
B ♦ SPILLWAY W
1 I dry storage provided at this elevation (cy) 221 effective width, We (ft) 43
FILTER FABRIC diameter ofdewaterin orifice in 4.0 L/We baffles required 2.1 f
9 ( ) ( req )
UNDERLAYMENT x
I
diameter of flexible tubingin orifice+2 6.0 , DEPTH = 2) collars: YES �
4:! SIDE SLOPS & runoff. depth of water at spillway crest (ft) 5.79
\ CREST ELEV.=638.79 C (use 0.45 for bare earth) 0.45 slope of upstream face (Z' 1) 2 /
. o
� � � � �-� � � � � � � tc (min) 10 slope of barrel (Sb) 4.17 /D /
\ G 12yr 4.1 Q 2yr 5.1 length of barrel in saturated zone (Ls) 41.7
_ f
30
1 � � \\ 125yr 6.0 Q 25yr 8.2 number collars required 2 � \
dimension of permanent collars 4. VI V
D
principle spillway:
■ PROPOSED TEMPORARY 15" CMP 90-31 \ available head (ft) 1.00 emergency spillway: YES
\ BARREL. THE CONNECTION BETWEEN 62 AC \
I \ diameter riser m 24 required capacity Q25-Q
_ ■ THE RISER AND THE BARREL SHALL BE 2 .
■ I WATERTIGHT. LENGTH=64', 11 SF \ spillway capacity, Qp (cis) 13.0 bottom width (ft) 12 .
BZ 1 ■ INVERT IN=632.00, INVERT OUT=629.33, diameter trash rack (in) 36 slope of exist channel (ft/ft) 16%
■ ■ \SLOPE=4.37% barrel length (ft) 64 minimun length of exit channel (ft) 33 \
6 .7 -' head on barrel through embankment (ft) 9.46 crest of spillway (ft) 638.79 \ \
1- ri diameter of barrel (in) 15
NOTE: POST SPACING SHALL \ `
w/WIRE \
SF � MAXIMUM OF 8 FEET. HEIG ' TO
SUPPORT SHALL BE AT LEAST 24 INC[Sediment Trap design #3 \ F D M
i' YARDBLE
drainage area acres 2 ac 1.00 I
- _ - BUT NO GREATER THAN s (acres) )
6' WIDE TOP OF DAM trap volumes: ORIGINAL CREST OF STONE WEIR A�*
I
\ INCHES. elevation (ft) area (so wlume(cf) volume(cy)¢ ND �
588.5 1203 0 0.0 ° CONCRETE WASH
PROPOSED SAFETY FENCE 590 1692 2,.0
161 80DRY STORAGE - Ya VIRVRIE OUTAREA
AROUND SEDIMENT BASIN 592 2645 6,463 239.4 +�
0 0 0 0.0
/ \ I D 0 0 0.0 WET STORAGE
4o FOOT LONG AND (°p°ATED) FLreR cLorx a«NNu - - - _
H(-a)HHHEy'(
6 FOOT HIGH BAFFLES
wet stora e:
I Ili I \ g * * .SEE PLATE ].13 1 CON6E AIXIiEGAIE� CLASS I RPRAP \ \ , 1
wet storage required (cy) (67 DA 1.2) 80.4 ❑❑
I 1
bottom of stone weir (ft) 590.00
I
wet storage provided at this elevation (cy) 80.4
ROAD slope of wet storage sides 2:1 SEDIMENT TRAP #3 DETAIL
I
GRAVEL CONSTRUCTION I weir length (ft) (6xDA) 6.0 „ ,
PROPOSED TEMPORARY iS"CMPOUTFALLTOSBi II I SCALE: 1 =20GRAPHIC SCALE
- SITE ACCESSROADENGTH= INV IN=6 0. INV OUT= 6 dry storage: bottom of trap elevation (ft) 588.5
353', 4 73, 37 79
Ic SLOPE=8.33% dry storage required (cy) (67*DA*1.2) 8D.4 bottom trap dimensions: 32X53' 20 0 10 20 40
/ crest of stone weir 591.0 top of dam elevation (ft) 592
dry storage provided at this elevation (cy) 80.4 top width of dam (ft) 6'
SEDIMENT BASIN #1 DETAIL slope of dry storage sides 2:1 top trap dimensions 47)G2'
( IN FEET )
SCALE: 1"=20'
1 inch = 20 ft.
SAF h h TP h/
S L TYPE DID
2
588-.50
I ,
� I
6' OP
OF DAM
GIIOUND 1 \ \
ELLV. �a
e: - wet storage: •SEE PLATE 11�1 COARSE ApNiEGATE_ COATS I RPRAP A
wet storage required (cy) (67*DA*1.2) 57.1
��c�✓ bottom of stone weir (ft) 590.02 CONCRETE WASH
wet storage provided at this elevation c 57.1 OUT AREA
9 P (Y) �
'�+ slope of wet storage sides 2:1
' weir length (ft) (6xDA) 4.3
SEDIMENT TRAP #1DETAIL dry storage: bottom of trap elevation (ft) 588.5
, OUTLET TL E T PROTECTION 0 TE G T 0 N SIZING dry storage required (cy) (67*DA*1.2) 57.1 bottom trap dimensions: 2TI
SCALE: 1„ =2o crest of stone weir 591.0 top of dam elevation (ft) 592
NOTE: SEDIMENT TRAP 1 WILL BE CONVERTED TO A
SEDIMENT BASIN ONCE OUTFALL PIPE HAS BEEN INSTALLED
TYPE
LENGTH
WIDTH
DEPTH
OP1
VDOT CLASS 1 A
8'
9.25'
1.5'
OP2
VDOT CLASS 1 A
10'
9.25'
1.5'
OP3
VDOT CLASS 1 A
16'
9.25'
1.5'
Lic. No. 035791
12/3/204
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JOB NO.
112066
80
SCALE
1" = 20'
SHEET NO.
10
PRE -DEVELOPMENT SWM PLAN: -- - - PROPOSED STORMWATER MANAGEMENT NARRATIVE FOR THE PROJECT:
-Now - _ - - - -� � �- - � , � _ _ POST -DEVELOPMENT SWM PLAN: OVERVIEW:
SCALE 1"=60' - SCALE 3.=6o
MANAGEMENT -
/ -� , ----- ROW S� OU DRAIN INTr}- --- _ _ _ _ _ _ - - --- REQUIREMENTTHE S TO MITIGATERI PACTS FROM THE PROPOSED ROPOSED IMPROVEMENTS. SUMMARIES
DOWNSPOUTS ICH WILL TIE --- - _ -
i i _ -----_ INTO THE C PONDM YARD i _ OF THIS COMPLIANCE CAN BE VIEWED IN THIS VSMP SET AND IN THE ACCOMPANYINGA
LINES- BEHIND THE LOTS - _-- ------ --- STORMWATER MANAGEMENT CALCULATIONS PACKET.
- 68o ,682� �684� '6� -- \ 680 _6I �61 '6_ STORMWATER QUANTITY:
i 6$° IF i' 4d�30'OY`4f°E 22D,1�- i �Rf 68ir - - --- 6$n N36`01'"E \20�-¢ �68 - CURRENTLY ALL OF THE EXISTING IMPERVIOUS AND PERVIOUS AREAS WITHIN THE PROJECT
. - _-• 6$$_ LIMITS EXIT THE PROPERTY UNTREATED. THE PROPOSED PLAN WILL CHANGE THIS AND
� � WILL CAPTURE THE MAJORITY OF THE PROPOSED IMPROVEMENTS. THE CAPTURE AND
690 / \ / / 686 - a Ego DETENTION OF THE MAJORITY OF THESE IMPROVEMENTS IS REPRESENTED BY
,� ■ / 69 ,` G5 5 �� mo - mo (�c�2�-- / POST -DEVELOPMENT SUBAREA A, WHERE AN UNDERGROUND DETENTION SYSTEM
\ / 684 _ / 684 ■ " �,Go +�" o ti �o " �o ATTENUATES THE RUNOFF. THE REST OF THE DEVELOPMENT CONTAINING THE EXISTING
/ % J / ■ \ / / / / J / ■ RESIDENTIAL LOTS AND EMERGENCY ACCESS ROAD THROUGH THESE LOTS IS
Tc / REPRESENTED BY POST DEVELOPMENT SUBAREAS B & C, WHERE A DETENTION BASIN
\ / / \ ■\ / / V` 58' 0 OLF w/ A ELEV.=3' \ / \ _ _ \\ ATTENUATES THE RUNOFF. CHANNEL PROTECTION IS MET VIA 9VAC25-870-66 SECTION
�� / ' X8' 0 0 C. OW w/ ELEV.=6' I 6$(0 ■ B.3.a. FLOOD PROTECTION IS MET VIA 9VAC25-870-66 SECTION C.2.b.
- / ■ ' SUBAREA C -, % ■ 8 \
0.73 BC. PLEASE SEE THE ATTACHED STORMWATER MANAGEMENT CALCULATIONS PACKET FOR
/\ / �� / \ / ■ ADDITIONAL DETAILS PERTAINING TO THE STORMWATER QUANTITY COMPLIANCE.
�N=58 0 I / � - ' - N �6� /
\TC=0.15 hrs. I I - - io�� 6 6` / \ STORMWATER QUALITY:
/ / T E BOUNDARY
N D LIMIT T I 8 I I T E BO THE STORMWATER QUALITY REQUIREMENTS FOR THIS DEVELOPMENT ARE MET
SUBAREA
lac. B / ' D TUR NICE 4.36 ac. IS I \ 1 ROP SED LIMIT -OF THROUGH THE BEST MANAGEMENT PRACTICE OF PURCHASING NUTRIENT CREDITS. A
♦ v ___
' -1 D TUR NICE 4.36 dC. I MINIMUM PHOSPHOROUS REMOVAL RATE OF 3.06 Ibs/yr IS REQUIRED. THE DEVELOPER
( % WILL PURCHASE NUTRIENT CREDITS PRIOR TO THE ISSUANCE OF A LAND
\ I CN$58 0 �� / .� / USED O DEFINE THE \ I �� / SED 70 DEFINE THE \ DISTURBANCE PERMIT.
TC= .79 hrs. 6°� B UND RY FOR THE VRRM 690 �o Wo ro me B UNb RY FOR THE VRRM
\ I " ♦♦ WATER LA QUALITY I \ \ \ / I I WA ER QUALITY PLEASE SEE THE ATTACHED CALCULATIONS PACKET AND THIS SHEET FOR ADDITIONAL
\ ♦ CALCULATIONS, TYP. x o v wo DETAILS.
��� � � � � � � � � � " � " � �CATIONS, TYP:, i
o �19 rs. ♦ / +moo
70' OF OLF w/ A ELEV.=3- _. . '�� b� N \ \ "
\ 49' OF CONIC. FLOW w/ Q ELEV.-2'
\ ♦ ■ _ ��0� 686 --_ a n ��i '90681_ - 69Oy 688 686 -68 - -
♦ - _ --_
688 _ _ - II - -
- - --
\ o ,♦ 682_ 68o ro-o.60rs. \ \ \ 682--68z=68o 4- -
\ • _ Tc- .1 hrs.
\ \ \ \ • I _ i �� 30' OF OLF w/ ELEV.=2` \ \ \ \ 1$ OF OLF w/ ALE =5 9 -- - - - - - - -
\ \ \ • 34' OF 90r! FL011M1 w/ ELEV.=14' \ \400'\'OF
OF C\. FLOW w/ d EV. 3'--Rr
■�, V L FLOW ®6 5 f �89& -. - 68•IF IN MON
CHANNEL \.
\ \\ 68 ON LINE\ _49�
\ \ \ \ \ \\ 684_ t
- - -� a 0.10 c. \ \ \\ \ \ \\�84 o CN=61 \ \ \ \ N io5
MAR
�e Tc=0.1d hrs.
\ \ \ \ \ \ 682 - -- _ s --- \ \ \ \ \ 682 �o �o S AR A A No
SUE4ARE/�A- I^ \ \ \ \ \ \ \ UC� 2.41 ac.
3 6 ac. j \ \ \ \ \ \ \ \ s so
CN=86
CN=74 _ \ \ \ \ \ \ \ >8 678 =0.10 hrs.
\ \ \ \ \ Tc=0.21 hrs. -- - - \ \ \ \ \ so pa
UNDERGROUN
�
\ \ \ \ \ \ 74 - - - -- ■ 6 \ i \ \\ \ \ \ \ DETENTION u O w5 6�6
- \
v v v v V A A A �67■�167� v v v v \ V �swM �� - - 67 h'6jz -
\ e - / \ 6
67
-668 _ �� A V A \ \ A A A V -668 _ - - ■ �g _ i
\ \ \ - \
v v A V -664 ■��' v v v v v V A V 666- a,
- 9
\ \ \\ \ \ \ 664 60' OF OLF w/ A ELEV.3' 6 / \ 6LFI - _ ■
7B6' of coN-FLOW w/ ASV.=1oa' V� V A 6
\\ \ \\ \ \ \ 662 - - - - c u\ / \ \ \ \ \\ - 6621- i]
\ V A� \ A V A VA ��SUBARFAB 4-66z
658 L A /
__65i_
A A - - =81
-654 5 6� _� VA \ - \ \\ \ =0•1-D 654 = o- - - - ■� 1.18 at. 6�a'
652 - - 65z�� _ _ V A V�\ \ \A 652 'a- _ - 66 C =75 6��
\ \ \ -650 % - 650 \- \ \ \ -6$O - -�- " TS= y10 hrs -
\ 648 I i 648\ B Y_ - - f \ \ \ \ \ \ 648 = _ ,65$- 6 B - - - -
\646 _ - -646- \ �� PROPOSED LIMIT OFF \ \ \ \ Tc=o.10 hrs. 6- - - �65- -646- ��E B - _ Y
I
- \ \ \ aa' OF-OLF w/ A €Lev=5' �'�\\` 65z -1544
_ PROPOSED LIM1 flF
\ \ \ 644 / - o4za TSTURBA ICE (4 ac._ \ \ \ \ 123' cHANNELFLON ®o_ss ft/s- 644 \' 650 - vz - - ISTURBANC€(4:
-642 / / �048 \ \ \ \ CHANNEL FLOW 010 ft s% -6[t2 1 k2 - 6 64g �04° SED TH DEF F fHE \
SED TO REF THE-
\ \ \ \ 640 ■ ��� F 3 _ BOUNDARY FOR THE V RF1 \ \ \ \ \ - _ 640 -- �'sk 3A 8 BOUNDARY -FOR THE V M\
\ - - - - 1 - 636- - _ WATER ITALITY \ \ \ --- -- - - 3 0 .I - 64z - i 636- - _ \
- Q \ �- $ WATF�tQUALITY \
638 ■ / I 3163473"W� 3 49LCU __TI0N5,\\ \ \ \ \ \ 6 8 _ 8 60 6 6 -- 31 634)3"W 3-4�TLCU7SQ TY
636 \ I x i - 63z- - - \ \ 636-3 �63z-�J - 6 I // -- � 0- -� _ \ \ \ \ o-_
\ \ - "
_ l
\ 34- I % 26 \ + I \ \ \ _� 634- -I 20� / B $ I
\ 63z- \ 63z_ 3z6 �6z4_ \ - _ \ \ \ _ ■■�6z4_ \
i 6zz \ - \ \ 6 ° r 622 \
V A \ L 6�9 - - -■- 61 \V r V A \ L 6�8 - �/ 6 \ \
\ V v 624 - v 624 -
_62
\ e 4 1�1 _ - /�225 \� 6�s \ J \ \ \ �m 4 �~ _,� 6\2 i(C- _ 6s Tc=0.1 hrs -
\ \ cn n �22 �-�- � A 6� V 2-1� J l / -
2 'L 6 50' w A ELEV -7.5'
\ ti m ��� \ �- ■ T`V A V A ti m _ 2�, \ 'tS,� A 55"OF CONIC. FtONI,w�A ELEV.=88'
620 y A\ /j ���z1 VA A V �A �c>m 620 _ 2z ��s
'�
\ \ ■ °8 \A v A \ V v j
18-
' _ 23 3 8 \A v \
\ V A v 616� � ■ o A V v -63.6 r ■ -0 \
V A \ A i� - A6m \ �\ v VA V A V A \ __614 0
a \ v VA
AN os� A V:6A \
\ \ _6i2 �� �� ■ -V A ✓ V A - \ _612 , �� \ V A
i
\ \ 0 610- ■ �6oz V A \ 0 610- I6oz V A A
\ v / r �- \ ��� �i
\ \ \ \ \ - I�/ / ■ ♦ 6 o� ziI ♦
6O0o\\ \\
\ - -- - - 6o6- / ■ S919 /� _ -6o6- / SWM 2 ♦ S9a
v i
-604� TENTIOJ
0594 062 BASIN -59zLOCATION of -592
S M 2 \
- \ PROPOSED ■ \ \ \ - - - - 8 _ \ /may � _ Pre -Development Impervious Area Summary
-598 - Pon oN Sgo \ \ - \ \ _ 598 \ \ / g r90 E IX STING RO DSIDE LOD for Water Quality
598- - - - _ 59 !_
\ \ 19a /I L \ \ \ - - - - - \ 9a /I / �2. 90 TO BE LINED WITH VDOT DITCH Building 488 sf
���� / \
\ _ EN O lS�� 1 5 0 U O ION 3
\ 9
S Roads/Driveways 19,995 sf
5 y5$8 5 CLASS II STONE RIPRAP
-- - �y - - - - �y4 $ FOR OUTLET R TECT 20 48
592 \ o�� -592 Q 5 OUT /
�- 59° 5 2 \ \ \ / \ - _ ��p (,� -590 h� 24 \ / Post -Development Impervious Area Summary
\ \ \ - - - / _ EXISTING \ \ OD for Water Quality
- v - 0 / �� ROADSIDE V /
-- _ �/ 5 / \ �/ [Sidewalks
uilding 25,801s f
_ A DITCH arking Areas/Roads 46636sf
-5 � \ -� -586 .2 � / / -0UTFALLS TO \ � '
86?��f - - - \ \ 0� - - - & Concrete 7,037 sf
EXISTING 24"
79,474
CMP
General Construction notes for Stormwater
Management Plans
1. All dams and constructed fill to be within 95% of
Post -Development Impervious Area Summary
maximum dry density and 2% of optimum moisture
Subarea A, Water Quantity
content. All fill material to be approved by a
Building
26,169 sf
geotechnical engineer. A geotechnical engineer is to
be present during construction of dams.
Parking Areas/Roads
34,179 sf
2. Pipe and riser joints are to be watertight within
stormwater Management facilities.
Sidewalks &Concrete
6,979 sf
3. For temporary sediment traps or basins which are
67,327 sf
to be converted to permanent stormwater
management facilities; conversion is not to take
Subarea B, Water Quantity
place until the site is stabilized, and permission has
Building/Structure
1,597 sf
been obtained from the erosion control inspector.
Roads/Driveways
7,374 sf
Pre -Development Impervious Area Summary
8,971 sf
Subarea A
Subarea C, Water Quantity
Building/Structure 3,924 sf
Building/Structure
348 sf
Roads/Driveways 18,845 sf
Roads/Driveways
2,869 sf
22,769 sf
3,217 sf
WATERSHED SUMMARY
CN
Area,
ac.
1-year Flow,
cfs
2-year Flow,
cfs
10-year Flow,
cfs
DA A, B, C, & D (Pre-Dev)
70
4.36
3.71
5.85
13.32
CN
Area,
1-year Flow,
2-year Flow,
10-year Flow,
Post
82
4.36
1.31
4.37
13.29
NOTE: Sub-Area'A' is routed through Underground Detention System 'SWIM 1' and Sub -Areas B & C are
routed through Detention Basin'SWM 2'
CHANNEL& FLOOD PROTECTION SUMMARY
Pre-Dev. Post-Dev. Method of 9VAC25-870-66 Method of 9VAC25-870-66 Method of 9VAC25-870-66 Method of 9VAC25-870-66
Subarea Subarea Channel Protection Compliance Limits of Analysis for Channel Flood Protection Compliance Limits of Analysis for Flood Protection
Protection
A, B, C, & D A, B, & C Section B.3.a (Energy Balance) N/A (Energy Balance Satisfied) Section C.2.b (10 yr. Post Flow < Pre Flow) N/A (10-yr. Post Flow < Pre Flow Satisified)
GRAPHIC SCALE
60 0 30 60 120
( IN FEET )
1 inch 60 ft.
240
SCOTT/R. Cb�LLINS'Z
Lic. No. 035791
p 12/3/20 ,rj
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JOB NO.
112066
SCALE
1"=6o'
SHEET NO.
11
190
-0+50 0+00 0+50 1+00 1+50 2+00 2+So 3+00 3+So 4+00 4+50 S+oo S+So 6+oo 6+So 7+00
FSWM 1 TO OUTFACE PROFILE
E AT
iE SYSTEM
iET
ION
ILL
RGROUND DETENTION
NUATE RUNOFF CAUSED
T.
Do'
PROFILE SCALES
i"=5' (VERTICAL)
i"=5o' (HORIZONTAL)
PROPOSED ACCESS MH w/ STAIRS FOR
INSPECTION & MAINTENANCE, TYP.
ACCESS MH TO BE LOCATED UPSTREAM &
DOWNSTREAM FROM RESTRICTIVE WEIR
PLATE AND AT THE MIDPOINTS & HIGH
POINTS OF THE SYSTEM, AS SHOWN.
RESTRICTIVE STEEL WEIR PLATE, AT
LOW POINT, TO DRAIN THE SYSTEM.
SEE DETAIL ON THIS SHEET.
n
11+00
-' +
j 096" INV. 559,48 _ ----- - - -
_ .00 LF O
J V,° J
Ln
CD
0
DI MUM
096" INV. 55 .42' TTF-
0.5% L
CONTRACTOR SHALL CALL THE COUNTY INSPECTOR
& ENGINEERING DEPARTMENT 24-HOURS BEFORE
ANY ANTICIPATED CONSTRUCTION ACTIVITIES FOR
THE BMPs. THIS IS INCLUSIVE OF WHEN THE
UNDERGROUND DETENTION SYSTEM SUBGRADE IS
READY FOR PIPE CONSTRUCTION, BUT BEFORE
STONE BEDDING IS INSTALLED.
UNDERGROUND DETENTION DETAIL: SCALE
FACILITY INSPECTIONS DURING CONSTRUCTION:
CONSTRUCTION INSPECTIONS ARE CRITICAL TO ENSURE THE UNDERGROUND DETENTION SYSTEM IS PROPERLY BUILT. BECAUSE THE
TIMING OF THE INSTALLATION 15 DICTATED BY THE CONTRACTOR, THE CONTRACTOR SHALL BE RESPONSIBLE FOR CONTACTING THE
ENGINEER, COUNTY INSPECTOR AND CONTECH REPRESENTATIVE PRIOR TO INSTALLATION. CONTECH, OR AN EQUIVALENT PIPE
MANUFACTURER, SHALL BE CONTACTED WELL AHEAD OF THE CONSTRUCTION START DATE TO ENSURE ADEQUATE LEAD TIME FOR
MATERIALS AND DELIVERY. MULTIPLE SITE VISITS AND INSPECTIONS ARE REQUIRED TO BE SCHEDULED BY THE CONTRACTOR, WITH
THE ENGINEER, COUNTY INSPECTOR & PIPE MANUFACTURER, DURING THE FOLLOWING STAGES OF THE UNDERGROUND DETENTION
SYSTEM CONSTRUCTION PROCESS:
a. PRE -CONSTRUCTION MEETING
2. INITIAL SITE PREPARATION (INCLUDING INSTALLATION OF PROJECT E&S CONTROLS)
3. EXCAVATIONIGRADING(E.G., INTERIMIFINAL ELEVATIONS).
4. WHEN THE DETENTION PIPE SUBGRADE IS READY FOR PIPE CONSTRUCTION, BUT BEFORE STONE BEDDING 15 INSTALLED.
S. AFTER STONE BEDDING IS PLACED AND COMPACTED, BUT PRIOR TO PIPE INSTALLATION.
6. AT THETIME OF THE PIPE INSTALLATION.
7. AFTER PIPE INSTALLATION, BUT PRIOR TO PLACING FILL OVER THE SYSTEM.
8. FINAL INSPECTION (DEVELOP A PUNCH LIST FOR FACILITY ACCEPTANCE)
PLEASE ALSO SEE BELOW, UNDER FACILITY MAINTENANCE, FOR REQUIRED INSPECTIONS AFTER INSTALLATION IS COMPLETE.
FACILITY INSPECTIONS & MAINTENANCE AFTER CONSTRUCTION:
THE FOLLOWING MAINTENANCE TASKS SHALL BE PERFORMED BYTHE CONTRACTOR IN THE FIRSTYEAR FOLLOWING THE
INSTALLATION OFTHE UNDERGROUND DETENTION SYSTEM.
a. FOR THE FIRSTYEAR FOLLOWING CONSTRUCTION, THE SITE SHALL BE INSPECTED BYTHE CONTRACTOR QUARTERLYAND AFTER
STORM EVENTS THAT EXCEED 2/2 INCH OF RAINFALL.
2. THE CONTRACTOR SHALL LOOK FOR BARE OR ERODING AREAS IN THE CONTRIBUTING DRAINAGE AREA AND AROUNDTHE
UNDERGROUND DETENTION SYSTEM AND MAKE SURE THEY ARE IMMEDIATELY STABILIZED. CONTRACTOR SHALL SPOT RESEED AS
NECESSARY AND ENSURE ADEQUATE SITE COVERAGE IS PROVIDED WITHIN THE FIRSTYEAR. AT THE QUARTERLY INSPECTIONS,
AND AFTER EACH RAINFALL EVENT IN EXCESS OF}", THE CONTRACTOR SHALL PERFORM THE ANNUAL MAINTENANCE TASKS
DESCRIBED BELOW IN#3.
AFTER THE FIRST YEAR THE OWNER SHALL PERFORM FOLLOW-UP INSPECTIONS ANNUALLY, AND AFTER EACH SIGNIFICANT RAINFALL
EVENT:
3. A SPRING MAINTENANCE INSPECTION AND CLEANUP SHALL BE CONDUCTED ANNUALLY. THE MAINTENANCE PROGRAM FOR THE
UNDERGROUND DETENTION SYSTEM SHALL INCLUDE CLEANING IT ANNUALLY OF TRASH, DEBRIS & SEDIMENT AND ENSURING THE
INTEGRITY OF THE WEIR PLATE, TRASH RACK AND OUTFALL & INFLOW PIPES. THE OWNER SHALL ENSURE THE SYSTEM IS
OPERATING AS INTENDED AND IS NOT CLOGGED OR DAMAGED. THE OWNER SHALL IMMEDIATELY CLEAN & REPAIR THE FACILITY
AS NECESSARY AND SHALL PAY SPECIAL ATTENTION TO THE INLET AND OUTLET LOCATIONS. THE ACCESS MANHOLES SHALL BE
USED FOR INSPECTION AND MAINTENANCE.
UNDERGROUND DETENTION SYSTEM GENERAL NOTES:
1. TRASHRACKS SHALL BE INSTALLED ON ALL ORIFICES, INCLUDING THOSE LOCATED ALONG THE WEIR PLATE WITHIN
THE UNDERGROUND DETENTION SYSTEM, IN ACCORDANCE W/ THE DETAIL SHOWN ON ON THIS SHEET (OR
EQUIVALENT).
2. DETENTION SYSTEM's WEIR PLATE TO BE PRE -MANUFACTURED AND DELIVERED TO THE SITE. WEIR PLATE SHALL
BE SECURELY AFFIXED TO THE INSIDE WALLS OF THE MANHOLE STRUCTURE.
3. PRIVATE DESOTO COURT LOCATED WITHIN THE SWM EASEMENT, SHALL SERVE AS ACCESS TO THE PROPOSED
UNDERGROUND DETENTION SYSTEM.
4. CONTACT COLLINS ENGINEERING (434.293.3719) REGARDING ANY QUESTIONS CONCERNING THE UNDERGROUND
DETENTION SYSTEM.
5. ALL FILL EMBANKMENT MATERIAL SHALL CONSIST PREDOMINANTLY OF SOIL AND BE PLACED IN SUCCESSIVE
UNIFORM LAYERS NOT MORE THAN 8 INCHES IN THICKNESS BEFORE COMPACTION OVER THE ENTIRE AREA IN
ACCORDANCE WITH CURRENT VDOT ROAD AND BRIDGE SPECIFICATIONS, OR THE FILL EMBANKMENT MATERIAL
SHALL MEETTHE PIPE MANUFACTURER'S SPECIFICATIONS OUTLINED BELOW (WHICHEVER IS MORE STRINGENT).
6. ALL FILL SHALL BE PLACED AT 95% COMPACTION AND TESTED BY A GEOTECHNICAL ENGINEER TO ENSURE
COMPACTION IS REACHED AND MAINTAINED, OR THE FILL SHALL MEET THE PIPE MANUFACTURER's
SPECIFICATIONS OUTLINED BELOW (WHICHEVER IS MORE STRINGENT).
7. VDOT STD. IS-1 & ST-1 ARE REQUIRED ON ALL PROPOSED PUBLIC STRUCTURES AND THE UNDERGROUND
DETENTION SYSTEM's JUNCTIONS.
8. PRIOR TO CONSTRUCTION THE CONTRACTOR SHALLTEST-DIG ATTHE EXISTING INLET & OUTFALLTO CONFIRM
THE INVERTS AND TO ENSURE THE PROPOSED GRADES CAN BE ACHIEVED. CONTRACTOR SHALL CONTACT COLLINS
ENGINEERING OF ANY DISCREPANCIES IN THE HORIZONTAL OR VERTICAL ALIGNMENT PRIOR TO ORDERING AND
CONSTRUCTION.
9. ALL EXCAVATION FOR UNDERGROUND PIPE INSTALLATION MUST COMPLY WITH OSHA STANDARDS FOR
CONSTRUCTION INDUSTRY (29 CFR PART 1926).
10.PENDING PRIOR APPROVAL BY COLLINS ENGINEERING, THE DRAINAGE PIPE MATERIALS MAY BE SUBSTITUTED. ALL
DRAINAGE PIPE INSTALLATION PRACTICES SHALL BE IN ACCORDANCE WITH CURRENT VDOT STANDARDS AND
REQUIREMENTS. CONTRACTOR SHALL ENSURE MINIMUM COVER REQUIREMENTS ARE MET WITH ANY PIPE
SUBSTITUTION.
OUTLET PROTECTION SUMMARY:
SEE CALCULATIONS PACKET FOR FULL OUTLET PROTECTION CALCULATIONS.
OUTLET PROTECTION INTO SWIM 2:
OUTLET PROTECTION TO INCLUDE A FILTER FABRIC UNDERLAYMENT KEYED INTO THE
EXISTING GROUND A MINIMUM OF 9" AT THE ENDS & ALONG THE PERIMETER. EDGES OF
FABRIC SHALL OVERLAP A MINIMUM OF 9". STONE TO BE VDOT CLASS Al STONE WITH THE
FOLLOWING DIMENSIONS:
La=16FT(TO EXTEND TOWARDS THE BOTTOM OF BASIN)
w1=3.75FT
w2=9.25FT
DEPTH=I.SFT
RIPRAP CHANNEL FOR OUTLET PROTECTION FROM SWIM i AND SWIM 2:
OUTLET PROTECTION TO INCLUDE A FILTER FABRIC UNDERLAYMENT KEYED INTO THE
EXISTING GROUND A MINIMUM OF 9" AT THE ENDS & ALONG THE PERIMETER. EDGES OF
FABRIC SHALL OVERLAP A MINIMUM OF 9". STONE TO BE VDOT CLASS II STONE AT A DEPTH
OF36INCHES
664
ACCESS TO SWIM FACILITY
11.0T LF
@ 5%
" IN
659.00' 18 -
PROPOSED ELEVATED 015" PIPE ALLOWS MORE SIGNIFICANT & LESS FREQUENT \
STORM EVENTS TO SAFELY BYPASS THE
UNDERGROUND DETENTION SYSTEM
PROPOSED LOWER 015"
___-- UNDERGROUND DETENTION
SYSTEM PRIMARY OUTFALL
��- Do iC
096" WEIR PLATE DETAIL
NOTE: SCALE: i"=5'
WEIR PLATE TO BE BOLTED &
SEALED TO DETENTION SYSTEM
WITH WATERTIGHT CONNECTIONS. 3.87'
OVERFLOW WEIR IS HYDRAULICALLY If�ll
EQUIVALENT TO AN ORIFICE WITH AN ELEV.=667.00'
APPROX. DIAMETER OF 013.13" (TOP OF PIPE)
ELEV.=664.30'
MANUFACTURE / INSTALL ONE (1) 06" X 08" MID -FLOW
ORIFICE IN THE STEEL PLATE (INVERT ELEVATION 664.30')
INSTALL TRASH RACKS ON ALL REINFORCED T GA.
ORIFICES, TYP. SEE THIS SHEET STEEL PLATE
FOR DETAIL, OR EQUIVALENT. ELEV.=659.00'
MANUFACTURE / INSTALL ONE (2) 03" LOW -FLOW
ORIFICE IN THE STEEL PLATE AT THE LOW POINT OF THE
DETENTION SYSTEM (INVERT ELEVATION 659.00')
685 685
rl
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Ln�ZZ
STR:4 VDOT MH 675
TP=67o.4i
INV IN: 658.46 TO SWIM 1(2) R
INV IN: 66o.44 TO 4A OPOSED GRADE (TYP.)
INV OUT: 652.46 TO 3
67 70
r-EXIS TING GRADE (TYP.)
iS" RCP
io LF Qa 15.94%
65 55
PROPOSED 96" CMP UNDERGROUND DETENTION
SYSTEM Qa o.5o%TO ATTENUATE RUNOFF CAUSED
FROM THIS DEVELOPMENT.
TOTAL CMP LENGTH=180.00'
SAFETY SLAB_
650 (SL-s) REQ'D )50
00
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PROPOSED ELEVATED iS" PIPE
65 ALLOWS MORE SIGNIFICANT& LESS
REQUENT STORM EVENTS TO
SAFELY BYPASS THE UNDERGROUND
3.5" RCP DETENTION SYSTEM
17.55 LF Qa 3.5.96%
EMERGENCY BYPASS PROFILE
SCOTT/R. 0_4�LLINS'Z
Lic. No. 035791
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SHEET NO.
12
------------
HUGGER
SINGLE BAR, BAND FLAT GASKET
BOLT AND STRAP(SBBS)
FLAT GASKET
CONNECTION DETAIL
(SBBS)
22/3"x1/2" RE -ROLLED END HEL-COR PIPE
GENERAL NOTES:
1. JOINT IS TO BE ASSEMBLED PER AASHTO BRIDGE CONSTRUCTION SPECIFICATION SEC 26A.2.4.
2. BAND MATERIALS AND/OR COATING CAN VARY BY LOCATION. CONTACT YOU R CONTECH REPRESENTATIVE FOR AVAILABILITY.
3. BANDSARE SHAPEDTO MATCHTHE PIPE -ARCH WHEN APPLICABLE.
4. BANDSARE NORMALLY FURNISHED AS FOLLOWS:
• 12" THRU 48' 1-PIECE
• 54"THRU96'2-PIECES
• 102"THRU144'3-PIECES
5. BAND FASTENERS ARE ATTACHED WITH SPOT WELDS, RIVETS OR HAND WELDS.
6. ALL CMP IS REROLLED TO HAVE ANNULAR END CORRUGATIONS OF 22/35t1/2'
7. DIMENSIONS ARE SUBJECT TO MANUFACTURING TOLERANCES.
8. ORDER SHALL DESIGNATE GASKET OPTION, IF REQUIRED (SEE DETAILS ABOVE).
H-12 HUGGER BAND DETAIL
NOT TO SCALE
20 MIL PE
IMPERMEABLE
LINER OVER
TOP OF PIPE
LIMITS OF
(IF REQUIRED)
REQUIRED
_ _ BACKFILL
S5„ TYP 36, TYP 30" SEE TYPICAL
BACKFILL DETAIL
NOTES
TYPICAL SECTION VIEW
►161rNbAMAIIIAN
NOTE: IF SALTINGAGENTS FOR SNOW AND ICE REMOVAL ARE USED ON OR NEAR THE
PROJECT, A GEOMEMBRANE BARRIER IS RECOMMENDED WITH THE SYSTEM. THE
GEOMEMBRANE LINER IS INTENDED TO HELP PROTECT THE SYSTEM FROM THE
POTENTIAL ADVERSE EFFECTS THAT MAY RESU LT FROM A CHANGE IN THE
SURROUNDING ENVIRONMENT OVER A PERIOD OF TIME. PLEASE REFER TO THE
CORRUGATED METAL PIPE DETENTION DESIGN GUIDE FOR ADDITIONAL INFORMATION.
UNDERGROUND DETENTION SYSTEM MINIMUM TRENCH & BACKFILL REQUIREMENTS
1. THE TRENCH CONTAINING THE DOUBLE RUN OF 96" CMP STORM PIPE SHALL HAVE A 288" WIDE TRENCH. THE
TRENCHES CONTAINING THE 15" BYPASS HOPE PIPE AND THE 15" OUTFALL PIPE SHALL HAVE 361, WIDE
TRENCHES. CONTRACTOR SHALL WRAP THE EXCAVATED TRENCHES WITH A 6 OUNCE FILTER FABRIC CLOTH. A
SUITABLE FOUNDATION SHALL BE BENEATH THE TRENCHES' FILTER FABRIC CLOTHS.
2. TRENCHES TO INCLUDE A 6" #57 STONE BED AT 95%COMPACTION BENEATH THE HP STORM PIPES.
3. TRENCHES SHALL BE BACKFILLED WITH #57 STONE AT 95%COMPACTION AND SHALL EXTEND A MINIMUM OF 6"
VERTICALLY ABOVE THE CROWN OF THE STORM PIPES.
4. THE TOP OF THE #57 STONE SHALL BE COVERED WITH A 6 OUNCE FILTER FABRIC CLOTH, OVERLAPPING THE
PREVIOUSLY INSTALLED CLOTH THAT SURROUNDS THE BOTTOM AND SIDES OF THE TRENCHES.
5. SUITABLE FILL REACHING THE FINISHED GRADES SHALL BE APPLIED ABOVE THE TOP LAYER's FILTER CLOTH,
MEETING MINIMUM PIPE MANUFACTURER'S REQUIREMENTS TO PREVENT FLOATATION AND ENSURE PIPE
INTEGRITY IS MAINTAINED.
6. A MINIMUM COVER OF 12" IS REQUIRED ABOVE THE CROWN OF THE STORM PIPES.
7. SEE THE'TYPICAL BACKFILL DETAIL' ON THIS SHEET FOR ADDITIONAL UNDERGROUND DETENTION SYSTEM PIPE
REQUIREMENTS.
TRENCH CONDITION
EMBANKMENT CONDITION
I-
6
INITIAL BACKFILL
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DIAMETER
MIN.
COVER
CORR.
PROFILE
6"-10"
12"
1 1/2" x 1/4"
12"-48"
12"
2 2/3" x 1/2"
54"-96"
12"
3" x 1 5" x 1"
102"-144"
D/8
3" x 1 5" x 1"
INITIAL FILL ENVELOPED is
BACKFILL REQUIREMENTS FOLLOW THE GUIDELINES OF AASHTO LRFD BRIDGE DESIGN (SEC 12) AND CONSTRUCTION (SEC 26)
1 MIN IMU M TRENCH WIDTH MUST ALLOW ROOM FOR PROPER COMPACTION OF HAUNCH MATERIALS UNDER THE PIPE.
THE MINIMUM TRENCH WIDTH (12.6.6.1):
PIPE <_ 12": D+16"
PIPE > 12": 1.5D+ 12"
1a MINIMUM EMBANKMENT WIDTH (IN FEET) FOR INITIAL FILL ENVELOPE (12.6.6.2):
PIPE <24": 3.OD
PIPE 24" - 144": D + 4'0"
PIPE > 144": D + 10'0"
2 THE FOUNDATION UNDER THE PIPE AND SIDE BACKFILL SHALL BE ADEQUATE TO SUPPORT THE LOADS ACTING UPON IT(26.5.2).
3 BEDDING MATERIAL SHALL BE A RELATIVELY LOOSE MATERIAL THAT IS ROUGHLY SHAPED TO FIT THE BOTTOM OF THE PIPE, AND A
MINIMUM OF TWICE THE CORRUGATION DEPTH IN THICKNESS, WITH THE MAXIMUM PARTICLE SIZE OF ONE-HALF OF THE CORRUGATION
DEPTH (26.3.8.1, 26.5.3).
4 CORRUGATED STEEL PIPE (CSP /HEL-COR).
5 HAUNCH ZONE MATERIAL SHALL BE HAND SHOVELED OR SHOVEL SLICED INTO PLACE TO ALLOW FOR PROPER COMPACTION (26.5.4).
5a INITIAL BACKFILL FOR PIPE EMBEDMENT TO MEET AASHTO A-I,A-2 OR A-3 CLASSIFICATION, OR APPROVED EQUAL, COMPACTED TO 90%
STANDARD PROCTOR (T 99). MAXIMUM PARTICLE SIZE NOT TO EXCEED 3" (12.4.1.2). ALL LIFTS PLACED IN A CONTROLLED MANNER. IT IS
RECOMMENDED THAT LIFTS NOT EXCEED AN 8" UNCOMPACTED LIFT HEIGHT TO PREVENT UNEVEN LOADING, AND THE LESSER OF 1/3
THE DIAMETER OR 24" AS THE MAXIMUM DIFFERENTIAL SIDE -TO -SIDE (26.5.4).
6 INITIAL BACKFILL ABOVE PIPE MAY INCLUDE ROAD BASE MATERIAL (AND RIGID PAVEMENT IF APPLICABLE). SEE TABLE ABOVE.
6a TOTAL HEIGHT OF COMPACTED COVER FOR CONVENTIONAL HIGHWAY LOADS IS MEASURED FROM TOP OF PIPE TO BOTTOM OF
FLEXIBLE PAVEMENT OR TOP OF RIGID PAVEMENT (12.6.6.3).
7 FINAL BACKFILL MATERIAL SELECTION AND COMPACTION REQUIREMENTS SHALL FOLLOW THE PROJECT PLANS AND SPECIFICATIONS
PER THE ENGINEER OF RECORD (26.5.4.1).
NOTES:
• GEOTEXTILE SHOULD BE CONSIDERED FOR USE TO PREVENT SOIL MIGRATION INTO VARYING SOIL TYPES (PROJECT ENGINEER).
• FOR MULTIPLE BARREL INSTALLATIONS THE RECOMMENDED STANDARD SPACING BETWEEN PARALLEL PIPE RUNS SHALL BE PIPE DIA./2
BUT NO LESS THAN 12", OR 36" FOR PIPE DIAMETERS 72" AND LARGER.
• CONTACTYOUR CONTECH REPRESENTATIVE FOR NONSTANDARD SPACING (TABLE C12.6.7-1).
TYPICAL BACKFILL DETAIL
NOT TO SCALE
1/2' :m< pml•d neck
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PLAN
FRONT
48"0 to 90"0 FITTING REINFORCEMENT
MAY BE REQUIRED BASED ON HEIGHT OF
COVER AND LIVE LOAD CONDITION
TYPICAL MANWAY DETAIL
NOT TO SCALE
TEMPORARYCOVER FOR
CONSTRUCTION LOADS
HEIGHT OF
COVER
FINISHED
GRADE
FOR TEMPORARY CONSTRUCTION VEHICLE LOADS, AN EXTRA AMOUNT OF COMPACTED COVER MAY BE REQUIRED OVER
THE TOP OFTHE PIPE. THE HEIGHT -OF -COVER SHALL MEET THE MINIMUM REQUIREMENTS SHOWN IN THE TABLE BELOW.
THE USE OF H EAVY CONSTRUCTION EQUIPMENT N ECESSITATES GREATER PROTECTION FOR THE PIPE THAN FINISHED
GRADE COVER MINIMUMS FOR NORMAL HIGHWAYTRAFFIC.
PIPE SPAN,
INCHES
AXLE LOADS
(kips)
18 50 50-75 1 75-110 1 110-150
MINIMUM COVER
(FT)
2.0
2.5
3.0
3.0
1242
48-72
3.0
3.0
3.5
4.0
78-120
3.0
3.5
4.0
4.0
126-144
3.5
4.0
4.5
4.5
`IAINIMUM COVER MAY VARY, DEPENDING ON LOCAL CONDITIONS. THE CONTRACTOR MUST PROVIDE THE ADDITIONAL
COVER REQUIRED TO AVOID DAMAGE TO THE PIPE. MINIMUM COVER IS MEASURED FROM THE TOP OF THE PIPE TO
THE TOP OF THE MAINTAINED CONSTRUCTION ROADWAY SURFACE.
CONSTRUCTION LOADING DIAGRAM
NOT TO SCALE
SPECIFICATION FOR CORRUGATED STEEL PIPE-ALUMIN [ZED TYPE 2 STEEL
SCOPE HANDLING AND ASSEMBLY
A
36"0 MAX., HS-25 ACCESS CASTING
WITH GRADE RINGS AS REQUIRED, TO
BE PROVIDED AND INSTALLED BY
CONTRACTOR. MAYBE TOP MOUNTED
CMP (AS SHOWN) OR RECESSED Of
PROTECTION 0
SLAB RIM/FINISHED ------
GRADE _ -----_ _� VARIES
---- --- N
a
_ G d
a
GASKET MATERIAL 0 CMP RISER
SUFFICIENT TO PREVENT
SLAB FROM BEARING ONw
RISER TO BE PROVIDED BY
CONTRACTOR. 08 11' TYP.
SECTION VIEW {
REINFORCING TABLE
"BEARING
O CMP
A
B O
REINFORCING
PRESSURE
RISER
(PSF)
24"
X0
#5 @ 10- OCEW
2,540
CKT
#5 @ 10- OCEW
1,900
30"
C-6"0
32
#5 @ 10" OCEW
2,260
T-6" x 4'-6"
#5 @ 9" OCEW
1,670
36"
5'0
38
#5 @ 9" OCEW
2,060
Tx 5'
#5 @ 8" OCEW
1,500
42'
5'_610
44
#5 @ 8" OCEW
1,490
S'-6" x 5'-6"
#5 @ 8" OCEW
1,370
48'
6'0
50"
#5 @ 7" OCEW
1,210
6' x 6
#5 @ 7" OCEW
1,270
" ASSUMED SOIL BL >.
ACCESS CASTING NOT SUPPLIED BY CONTECH
d+
/3 00 A
AG B
#4 DIAGONAL TRI I
#4 DIAGONAL TRIM `� BAR (TYP.4 PLACES:
BAR (TYP.4 PLACES), ___� f__��__ _�, SEE NOTE i
SEE
OPENING IN
PROTECTION
SLAB FOR
ACCESS
INTERRUPTED BAR
REPLACEMENT, SEE
NOTE 6.
THIS SPECIFICATION COVERSTHE MANUFACTUREAND
SHALL BE IN ACCORDANCE WITH RECOMMENDATIONS OFTHE
INSTALLATION OF THE CORRUGATED STEEL PIPE (CSP) DETAILED IN
NATIONAL CORRUGATED STEEL PIPE ASSOCIATION (NCSPA)
THE PROJECT PLANS.
INSTALLATION
MATERIAL
SHALL BE IN ACCORDANCE WITH AASHTO STANDARD
THE ALUMINIZED TYPE 2 STEEL COILS SHALL CONFORM TOTHE
SPECIFICATIONS FOR HIGHWAY BRIDGES, SECTION 26, DIVISION II
APPLICABLE REQUIREMENTS OF AASHTO M274 OR ASTM A929.
OR ASTM A798 AND IN CONFORMANCE WITH THE PROJECT PLANS
AND SPECIFICATIONS. IF THERE ARE ANY INCONSISTENCIES OR
PIPE
CONFLICTS THE CONTRACTOR SHOULD DISCUSS AND RESOLVE
WITH THE SITE ENGINEER.
THE CSP SHALL BE MANUFACTURED IN ACCORDANCE WITH THE
APPLICABLE REQUIREMENTS OF AASHTO M36 OR ASTM A760. THE
IT IS ALWAYS THE RESPONSIBILITY OF THE CONTRACTOR TO
PIPE SIZES, GAGES AND CORRUGATIONS SHALL BE AS SHOWN ON
FOLLOW OSHA GUIDELINES FOR SAFE PRACTICES.
THE PROJECT PLANS.
ALL FABRICATION OF THE PRODUCT SHALL OCCUR WITHIN THE
UNITED STATES.
MATERIAL SPECIFICATION
NOT TO SCALE
1,-4., 2Y2"
3/' (#6) REBAR CAN BE CUT FLUSH - e ALL STEEL PER
ASTM A36
TO OUTSIDE OF RAIL
(BAR LENGTH = 163/4") OR BAR CAN o d
EXTEND BEYOND RAIL Y2"t FABRICATION TOLERANCE: tV4"
e FLATBARANDREBAR:MILL
318" TOLERANCE APPLIES
TYP.
12" TYP.
CENTER TO CENTER HOLE wl %" REBAR RUNG,
RUNG SPACING ip WELD REBAR TO RUNG ON
OUTSIDE OF STEEL RAIL
2Y2" x 3/3" FLAT BAR SIDE RAIL
PLAN SIDE
NOTES
1. LADDERS CAN BE MADE IN 20-0' STANDARD LENGTHS AND CUT TO FIT
2. ALL MATERIAL TO MEET ASTM A36
3. LADDER TO BE HOT DIPPED GALVANIZED PER ASTM A-123 AFTER
FABRICATION IS COMPLETE
STANDARD LADDER DETAIL
NOT TO SCALE
PART NO. HALAGVL16
PROVIDE MINIMUM OF 4 ATTACHMENT
ANGLES (2 ON EITHER SIDE OF LADDER RAIL)
TO CONNECT LADDER TO RISER EXTENSION
RISER w/ LADDER AND STEPS
IF EXTENSION IS REQUIRED
RISER w/ LADDER
AND STEPS
MAINLINE CMP
22/3 x Y2, 5 x 1, 3 x 1, ETC.
NOTE:
THIS DRAWING IS INTENDED TOAPPLYTO LADDERS
INSTALLED IN RISERS HAVING A DIAMETER OF 30" OR
LARGER. DUE TO SPACE CONSTRAINTS AND LIMITED
ACCESSIBILITY, THE PRACTICALITY AND SUITABILITY OF
UTILIZING RISERS SMALLER THAN 30" DIAMETER
AND/OR INCORPORATING LADDERS IN THESE SMALLER
DIAMETER RISERS SHOULD BE ADDRESSED BYTHE
OWNER AND PROJECT ENGINEER
-- 2" COVER
(TYR)
I
OPENING I
PROTECTIO
SLAB FO
ACES
STANDARD STANDARD
REINFORCING, REINFORCING,
SEE TABLE SEE TABLE
ROUND OPTION PLAN VIEW
NOTES:
1.
DESIGN IN ACCORDANCE WITH AASHTO, 17th
EDITION AND ACI 350.
2.
DESIGN LOAD HS25.
3.
EARTH COVER = V MAX.
4.
CONCRETE STRENGTH =4,000 psi
5.
REINFORCING STEEL= ASTM A615, GRADE 60.
6.
PROVIDE ADDITIONAL REINFORCING AROUND
OPEN INGS EQUAL TO THE BARS INTERRUPTED,
HALF EACH SIDE. ADDITIONAL BARS TO BE IN THE
SAME PLANE.
`NOTE: WHEN RISER EXTENSIONS
ARE USED, THE PLANT SHOULD
CUT 3" FROM THE SIDE RAILS AS
SHOWN
'3" FROM BOTTOM OF LADDER
RAIL TO RISER JOINT
"3" FROM TOP OF LADDER
RAIL TO RISER JOINT
LADDER RAILS AND RUNGS
(2)Y4' FILLET WELDS V LONG
ATTACH M ENT AN C
ZYx3"xy"x16"LONG ATV-0" MINIMUM OF4ANGLES P
SPACING. LONG LEG TO LADDER SECTION, (2 EACH SIDE
4 PROJECT OUT. WELD TOP LADDER) 6' MAX. SPACI
AND BOTTOM OF 3" LEG TO EACH VERTICAL
MAX. T CORRUGATION CREST
(THESE ANGLES SHOULD BE USED
a FOR LARGER DIAMETER
a MAINLINES WHERE ADDITIONAL
STEPS ARE NEEDED)
6" FROM RUNGTO
RISER JOINT
6" FROM RUNG TO
RISER JOINT
SECTION A -A
RISER LADDER DETAIL
NOT TO SCALE
RISER NORMALLY CMP
WITH 23/3" x Y2"
CORRUGATIONS
(4)Y6" FILLET WELDS
FROM EACH ANGLE TO
CORRUGATION CREST
(2 WELD EACH SIDE)
ZYx3"x3/ts"
5Y2" LONG
SQUARE OPTION PLAN VIEW
7. TRIM OPENING WITH DIAGONAL #4 BARS, EXTEND BARS A
MINIMUM OF 12" BEYOND OPENING, BEND BARS AS REQUIRED
TO MAINTAIN BAR COVER.
8. PROTECTION SLAB AND ALL MATERIALS TO BE PROVIDED AND
INSTALLED BY CONTRACTOR.
9. DETAIL DESIGN BY DELTA ENGINEERS, ARCH ITECTS AND LAND
SURVEYORS, ENDWELL, NY.
MANHOLE CAP DETAIL
(4)%6" FILLET WELDS FROM
EACH ANGLE CORRUGATION
CREST (2 WELDS EACH SIDE)
(4)43"x3"x3/6" _
5Y2" LONG
(2)y4' FILLETWELDS
1" LONG FROM EACH ANGLE
TO LADDER RAIL
NOT TO SCALE
LADDER RAILS
PLAN
- - - -
�'-
(4)%6" FILLET WELDS - - -
FROM EACH ANGLE TO
CORRUGATION CREST -
(2 WELDS EACH SIDE)
ZY x 3" x %e"
5Y2" LONG
II 4 _
ELEVATION
LADDER R)
AND RUNC
SCOTT/R. Cb�LLINS'Z
Lie. No. 035791 �
p 12/3/20
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JOB NO.
112066
SCALE
AS SHOWN
SHEET NO.
23
DETENTION BASIN'SWM T CONSTRUCTION NOTES:
FACILITY PLANTING SPECIFICATIONS:
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 OPTIONALAND
IS NOT REQUIRED.
2. THE PROPOSED INTERIOR SIDE SLOPES OF THE BASIN SHALL BE A MAXIMUM OF 4:1 TO REDUCE THE RISK OF EROSION. THE PROPOSED FLOOR SLOPES SHALL BE GRADED AT A MINIMUM
OF 0.50%TO PROVIDE POSITIVE DRAINAGE AT ALL TIMES TO THE RISER STRUCTURE.
3. WOODY VEGETATION SHALL NOT BE PLANTED OR ALLOWED TO GROW WITHIN 15 FEET OF THE TOE OF THE EMBANKMENT NOR WITHIN 25 FEET OF THE PRINCIPAL SPILLWAY
STRUCTURE.
4. THE SOILS IN THE STORMWATER BUFFER AREA ARE OFTEN SEVERELY COMPACTED DURING THE CONSTRUCTION PROCESS, TO ENSURE STABILITY THE DENSITY OF THESE COMPACTED
SOILS CAN BE SO GREAT THAT IT EFFECTIVELY PREVENTS ROOT PENETRATION AND, THEREFORE, MAY LEAD TO PREMATURE MORTALITY OR LOSS OF VIGOR. AS A RULE OF THUMB,
PLANTING HOLES SHOULD BE THREE TIMES DEEPER AND WIDER THAN THE DIAMETER OF THE ROOTBALL FOR BALL -AND -BURLAP STOCK, AND FIVE TIMES DEEPER AND WIDER FOR
CONTAINER -GROWN STOCK.
5. EXTRA MULCHING AROUND THE BASE OF TREES AND SHRUBS IS STRONGLY RECOMMENDED AS A MEANS OF CONSERVING MOISTURE AND SUPPRESSING WEEDS.
1. THE CONTRACTOR SHALL BE RESPONSIBLE FOR LAYOUT OF ALL WORK COVERED UNDER THESE PLANS.
2. LANDSCAPE CONTRACTOR SHALL REFER TO THE STANDARDIZED LANDSCAPE SPECIFICATIONS FOR THE STATE OF VIRGINIA FOR ADDITIONAL INFORMATION. THE CONTRACTOR SHALL
ABIDE BY ITS CONTENTS; HOWEVER ANY NOTES OR SPECIFICATIONS ON THE PLANS SHALL SUPERSEDE THOSE OUTLINED IN THE SPECIFICATIONS MANUAL (COPIES ARE AVAILABLE FORA
FEE FROM THE VIRGIN IA CHAPTER OF THE AM ERICAN SOCIETY OF LANDSCAPE ARCHITECTS, VIRGINIA NURSERYMEN'S ASSOCIATION, INC. AND THE VIRGINIA SOCIETY OF LANDSCAPE
DESIGNERS). ALL DISCREPANCIES SHALL BE BROUGHT TO THE ATTENTION OF COLLINS ENGINEERING PRIOR TO THE CORRESPONDING CONSTRUCTION ACTIVITY.
3. ALL PLANT MATERIAL SHALL MEET THE MINIMUM SPECIFICATIONS AND STANDARDS DESCRIBED IN THE CURRENT ISSUE OF THE AMERICAN STANDARD FOR NURSERY STOCK, PUBLISHED
BY THE AMERICAN ASSOCIATION OF NURSERYMEN, 1250 STREET, NW, SUITE 500, WASHINGTON, DC 20005.
4. THE CONTRACTOR SHALL VERIFY ALL DIMENSIONS IN THE FIELD AND NOTIFY THE DESIGNER OF ANY VARIANCE FROM THE PLAN.
5. THE LANDSCAPE CONTRACTOR IS RESPONSIBLE FOR VERIFYING THE LOCATION OF ANY ONSITE UTILITIES (CALL MISS UTILITY 1-800-552-7001 BEFORE ANY EXCAVATION).
6. REFER TO THE APPROVED FINAL SITE PLANS FOR ANY DETAILED SITE INFORMATION.
7. ALL WORK SHALL BE COORDINATED WITH OTHER PARTIES.
8. PLANTS WILL BE PREPARED FOR SHIPMENT IN A MANNER THAT WILL NOT CAUSE DAMAGE TO THE BARK, BUDS, BRANCHES, STEMS, OR OVERALL SHAPE OF THE STOCK. CONTAINER
GROWN PLANTS WILL BE TRANSPORTED IN THE CONTAINERS IN WHICH THEY HAVE GROWN.
9. ALL PLANT MATERIAL, UNLESS OTHERWISE SPECIFIED, SHALL BE UNIFORMLY BRANCHED AND HAVE A VIGOROUS ROOT SYSTEM. PLANT MATERIAL SHALL BE HEALTHY, VIGOROUS, AND
FREE FROM DEFECTS, DECAY, DISEASES, INSECT PEST EGGS, AND ALL FORMS OF INFESTATION. ALL PLANT MATERIAL SHALL BE FRESH, FREE FROM TRANSPLANT SHOCK OR VISIBLE WILT.
PLANTS DEEMED UNHEALTHY WILL BE REJECTED.
10. ALL CONTAINER STOCK SHALL HAVE BEEN PROPAGATED IN A CONTAINER LONG ENOUGH FOR THE ROOT SYSTEM TO HAVE DEVELOPED SUFFICIENTLY TO HOLD ITS SOIL. CONTAINER
STOCK WITH POORLY DEVELOPED ROOT SYSTEMS WILL NOT BE ACCEPTED.
11. PLANTS NOT INSTALLED ON THE DAY OF ARRIVAL ON SITE SHALL BE STORED AND PROTECTED BY THE CONTAINER. OUTSIDE STORAGE AREAS WILL BE SHADED AND PROTECTED FROM
THE WIND AND SUN. PLANTS STORED ON SITE SHALL BE PROTECTED FROM ANY DRYING 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
CRAMPING ROOTSTOCK.
16. THE CONTRACTOR SHALL MAINTAIN A ONE 1 CALENDAR YEAR 90%CARE AND REPLACEMENT WARRANTY FOR ALL PLANTINGS. THE PERIOD OF CARE AND REPLACEMENT SHALL BEGIN
AFTER INSPECTION AND APPROVAL OF THE COMPLETE INSTALLATION OF ALL PLANTS AND CONTINUE FOR ONE CALENDAR YEAR.
17. THE CONTRACTOR IS RESPONSIBLE FOR REMOVAL AND DISPOSAL OF TRASH AND DEBRIS WITHIN THE LIMITS OF THE PLANTING ON A DAILY BASIS.
18. THE CONTRACTOR WILL NOT BE RESPONSIBLE FOR PLANT MATERIAL THAT HAS BEEN DAMAGED BY VANDALISM, FIRE, OR OTHER ACTIVITIES BEYOND THE CONTRACTOR's CONTROL.
FACILITY CONSTRUCTION
1. THE DETENTION BASIN MAY SERVE AS A SEDIMENT BASIN AND/OR TRAP DURING PROJECT CONSTRUCTION. IF THIS IS DONE, THE VOLUME SHALL BE BASED ON THE MORE STRINGENT
SIZING RULE (EROSION AND SEDIMENT CONTROL REQUIREMENTS VS. STORMWATER TREATMENT REQUIREMENTS). INSTALLATION OF THE PERMANENT RISER SHALL BE INITIATED
DURING THE CONSTRUCTION PHASE, AND DESIGN ELEVATIONS SHALL BE SET WITH FINAL CLEANOUT OF THE SEDIMENT BASIN AND CONVERSION TO THE POST -CONSTRUCTION FACILITY
IN MIND. APPROPRIATE PROCEDURES SHALL BE IMPLEMENTED TO PREVENT DISCHARGE OF TURBULENT WATERS WHEN THE BASIN IS BEING CONVERTED TO AN DETENTION BASIN.
2. THE DETENTION BASIN SHALL ONLY BE CONSTRUCTED AFTER THE CONTRIBUTING DRAINAGE AREA TO THE FACILITY IS COMPLETELY STABILIZED. IF THE SITE OF THE PROPOSED SWM
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 THAT THEY ARE
CONSISTENT WITH THE FINAL CONSTRUCTION SPECIFICATIONS.
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 PROJECTAREA IF REQUIREDTOTHE 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 INTERNAL BERMS IN 8-TO 12-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:
Table 14.4. Clay Liner specifications
Property
Test Method
Unit
Specification
Permeability
ASTM D-2434
Cm/sec
1 x t0
Plasticity Index of Gay
ASTM D-423/424
%
Not less than 15
Liquid Limit of Clay
ASTM D-2216
%
Not less than 30
Clay Particles Passing
ASTM D-422
%
Not less than 30
Clay compaction
ASTM D-2216
%
95% of standard proctor density
Source: Virginia STorrnwater Management HarlaDOOK (1999)
9. UPON COMPLETION OF THE EMBANKMENT GRADING, THE CONTRACTOR SHALL EXCAVATE/GRADE UNTIL THE APPROPRIATE ELEVATION AND DESIRED CONTOURS ARE ACHIEVED FOR
THE BOTTOM AND SIDE SLOPES OF THE BASIN.
10. CONTRACTOR SHALLTHEN CONSTRUCT THE EMERGENCY SPILLWAY IN CUT OR STRUCTURALLY STABILIZED SOILS.
11. THE CONTRACTOR SHALLTHEN FINISH CONSTRUCTION OF ALL OUTLET STRUCTURES, INCLUDING DOWNSTREAM RIP -RAP APRON PROTECTION.
12. THE CONTRACTOR SHALL NEXT STABILIZE EXPOSED SOILS BY HYDROSEEDING OR SEEDING OVER STRAW.
13. THE CONTRACTOR SHALLTHEN INSTALLTHE APPROPRIATE BASIN LANDSCAPING IN ACCORDANCE WITH THE APPROVED PLANS.
FACILITY MAINTENANCE:
MAINTENANCE OF THE DETENTION BASIN IS DRIVEN BY ANNUAL INSPECTIONS THAT EVALUATE THE CONDITION AND PERFORMANCE OF THE FACILITIES. DURING THESE INSPECTIONS THE
FOLLOWING TASKS SHALL BE PERFORMED BY THE CONTRACTOR IN THE FIRST YEAR FOLLOWING INSTALLATION, AND THE OWNER THEREAFTER:
1. MEASURE SEDIMENT ACCUMULATION LEVELS IN THE BASIN.
2. MONITOR THE GROWTH OF THE GROUNDCOVER AND ANY TREES AND SHRUBS PLANTED, AS APPLICABLE. RECORD THE SPECIES AND THEIR APPROXIMATE COVERAGE, AND NOTE THE
PRESENCE OF ANY INVASIVE PLANT SPECIES, AS APPLICABLE.
3. INSPECT THE CONDITION OF STORMWATER INLETS TO THE BASIN FOR MATERIAL DAMAGE, EROSION OR UNDERCUTTING.
4. INSPECT THE BANKS OF UPSTREAM AND DOWNSTREAM CHANNELS, IF APPLICABLE, FOR EVIDENCE OF SLOUGHING, ANIMAL BURROWS, BOGGY AREAS, WOODY GROWTH, OR GULLY
EROSION THAT MAY UNDERMINE EMBANKMENT INTEGRITY.
5. I NSPECT BAST N 0UTFALL CHANNEL IF APPLICABLE FOR EROSION UNDERCUTTING RIP -RAP DISPLACE M ENT WOODY GROWTH etc.
6. INSPECT CONDITION OF PRINCIPAL SPILLWAY AND RISER FOR EVIDENCE OF SPALLI NG, JOINT FAILURE, LEAKAGE, CORROSION OR OTHER FAILURES.
7. INSPECT CONDITION OF ALL TRASH RACKS, REVERSE SLOPED PIPES OR FLASH BOARD RISERS FOR EVIDENCE OF CLOGGING, LEAKAGE, DEBRIS ACCUMULATION OR OTHER FAILURES.
S. 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
BYTHE 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.. INTERIM FINAL ELEVATIONS
EMBANKMENT NOTES:
/ ( g' / ) AFTER AN INVESTIGATION OF THE SITE'S SOILS, SITE VISITS, AN ANALYSIS OF THE SURVEYED TOPOGRAPHY AND AN
4. DETENTION BASIN INSTALLATION (e.g., INTERIM AND FINAL ELEVATIONS) EXAMINATION OF VA DIED APPENDIX A: EARTHEN EMBANKMENT, THE APPLICANT HAS PROVIDED ACOMPREHENSIVE
5. INSTALLATION OF THE EMBANKMENT THE RISER PRIMARY SPILLWAY AND THE OUTLET STRUCTURE .
/ s () EMBANKMENT DESIGN THAT DOES NOT NEED GEOTECHNICAL STUDY AT THIS TIME. SUCH IS THE CASE DUE TO THE
6. PLANTING PHASE (WITH AN EXPERIENCED LANDSCAPE ARCHITECT PRESENT/DIRECTING IF APPLICABLE) PRECAUTIONARY EMBANKMENT DESIGNS PROPOSED. A SUMMARY OF THE EMBANKMENT DESIGN REQUIREMENTS
7. FINAL INSPECTION(DEVELOPA PUNCH LIST FOR FACILITY ACCEPTANCE) ARE LISTED BELOW, MANDATING THE CONTRACTOR MEET THESE REQUIREMENTS AT A MINIMUM.
1/2" zinc plated hook
attached with 3/8 raetener
die bums
Isometric
I/4- HDPE p'a La (optional)
PuPIe rl •1:wR• /
ve
HOPE atru,1u,.I pleat,c .ii.
2-1/8- hple. and 1/a' PI"lu
:nanufat,L r d by Plastic
Solutlon. Inc. or equal
,h..n slth opO.nal
HDPF. atnrcluml planllr .1th
2-I/B" hole. end 1/4- plate
C OcLion manufactured by P1ssUc
SoluOona Inc or cquel
5/e- tlia halo
0 0
0 0 0
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0 0
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PLA9TIC
DEBRIS CAGE soLlJnoes P.a. Rnx .naB
RineMner 1'd 22ea1
INC. 877-977-5727
en ple�ie-WWaa<am
THE EMBANKMENTS SHALL HAVE A COMPACTED CLAY CORE WITH A CUTOFF TRENCH & BE IN ACCORDANCE WITH T nc
DETAILS SHOWN ON IN TH 15 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.
SECTION A-9: TS-PICAL. GRAPHICAL DET-AILS
J QR off Lench-two w suitable I
... rock L------walks
TYPICAL HOMOGENEOUS
EMBANKMENT
Troasilion fill
0tk M grovel
-Pipe outlet RBnn
Perforated cdlector nr�an sio�s
Foundation drain 4BbnNe1 drain
FOUNDATION DRAIN BLANKET DRAIN
dcaa
ea" mart
Rock or gravel
Rod Io< drllin
."a
�,Tr.n.6. filler TmnsiBon filler
CHIMNEY DRAIN TOE DRAIN
t I$UIT A-Ia. iromogeneen s L Maan"ienr5 M/ seepage (ontrots
6oS 60S
PROPOSED 024" HDPE STANDPIPE (STR. 25) WITH
TRASHRACK TO SERVE AS THE RISER STRUCTURE. SEE
DETAIL ON THIS SHEET, OR EQUIVALENT, FOR
TRASHRACK. RISER RIM ELEV.=590.60. RISER TO HAVE
ONE 4" LOW -FLOW ORIFICE (INV.=587.00). RISER INV
OUT=587.00 (TO EXISTING DITCH). TO PREVENT
FLOTATION THE RISER BASE SHALL BE FIRMLY
EMBEDDED 6" INTO AN is" THICK REINFORCED
CONCRETE FOUNDATION THAT IS 6'x6', AND
BURIED BELOW GROUND.
DETENTION BASIN SECTION PROFILE
Storm Rax TM
ROUND SERIES TRASH RACK
CONCRETE MANHOLE
STANDARD SO INCH RACKSHOWN
DIMENSIONS IN INCHES
PLAN
SIDE VIEW
Storrnl axTM Round Series for Concrete Manhole
PMINa
Mn1A
Dim
01me
Mb ID
MInCD
RS24
II Ya
iri
78 �
24
30
RS-36
21
a
b27
36
5457RSM
27% %
66%
60
1 70
Plastic Solutions, Inc. LTBI!)6ER
PO Eox 4386, Y csccr, VA 22404
i39 McGhee U. WM s, er. VA2ffi!<S
;&n)977-S727ph°^r PROW;
(54M 7Z2.2Z)9Ac
hap://www.Ne*tic-soA111°n.mn
ILA! Rmuanlltu etr7ncm
1wre;soLvrura, wc.
ISOMETRIC
PROFILE SCALES
i"=5' (VERTICAL)
s"=5o' (HORIZONTAL)
CONCRETE STRUCTURE DIMENSIONS
INSIDE STRUCTURE DIMENSION
OUTSIDE STRUCTURE DIMENSION
AVAILABLE OP7IONS
CROSS BRACING FOR OVERHANG
HDPEAMI-VORTEX PLATE
D77E
DRAM BY
NweY:
DETAIL
DRAINAGE DESCRIPTIONS
STR.
PIPE INFORMATION
INLET INFORMATION
NO.
IA
D.
(in.)
LENGTH
I (ft.)
SLOPE
(%)
INVERT
IN
INVERT
OUT
MATERIAL
INLET TYPE
Cub
Type
SLOT
LENGTH
RIM
ELEVATION
COMMENTS
SWM1
15
17.55
15.95%
665.50
662.70
RCP
4A
MHA
-
-
671.44
VDOT STD. IS-1 REQ'D
15
9.10
15.93%
661.89
660.44
RCP
4
MH-1
-
-
670.41
VDOT STD. IS-1 REQ'D
Swill! 1
MHA
-
-
670.95
VDOT STD. IS-1 REQ'D
15
1 11.84
4.56%
659.00
658.46
RCP
4
MH-1
-
-
670.41
VDOT STD. IS-1 REQ'D
15
65.65
8.73%
652.46
646.73
RCP
3
MHA
-
-
658.93
VDOT STD. IS-1 REQ'D
15
67.47
8.00%
640.73
635.33
RCP
3A
MH-1
-
-
644.09
VDOT STD. IS-1 REQ'D
15
61.78
8.00%
629.33
624.39
RCP
3B
MHA
-
-
629.13
VDOT STD. IS-1 REQ'D
15
1 60.87
8.00%
616.43
611.56
RCP
3C
MHA
-
-
615.79
VDOT STD. IS-1 REQ'D
15
63.92
7,99%
602.99
597.88
RCP
3D
MH-1
-
-
602.63
VDOT STD. IS-1 REQ'D
15
87.75
3.35%
592.88
589.94
RCP
2
MHA
-
-
593.69
VDOT STD. IS-1 REQ'D
15
91.28
1.51%
587.62
586.24
RCP
1
MH-1
-
-
591.17
VDOT STD. IS-1 REQ'D
15
23.79
1.01%
586.14
585.90
RCP
OUT
19
18" YARD INLET
-
-
649.50
8
122.09
643.00
631.69
HDPE
20
12" YARD INLET
-
-
635.50
8
112.61
626.34
612.83
HDPE
21
12" YARD INLET
-
-
615.50
8
67.01
610.55
602.83
HDPE
22
1
1
1
1
1 24" YARD INLET
-
-
605.50
8
49.71
602.06
597.27
HDPE
23
24" CLEANOUT
-
-
600.61
8
91.35
595.21
590.59
HDPE
23A
24" CLEANOUT
-
-
593.43
10
11.82
590.59
590.47
HDPE
25
24" HDPE RISER
-
-
SEE DETAIL
-
15
1 53.94
12.78%
1 587.00
1585.50
1 RCP
24
PROPOSED 024" HDPE STANDPIPE (STR. 25) WITH TRASHRACK TO SERVE AS THE RISER
STRUCTURE. SEE DETAIL ON THIS SHEET, OR EQUIVALENT, FOR TRASHRACK. RISER RIM
ELEV =590.60. RISER TO HAVE ONE 4" LOW -FLOW ORIFICE (INV.=587.00). RISER INV
OUT=587.00 (TO EXISTING DITCH). TO PREVENT FLOTATION THE RISER BASE SHALL
BE FIRMLY EMBEDDED 6" INTO AN 2.8" THICK REINFORCED CONCRETE
FOUNDATION THAT IS 6'x6', AND BURIED BELOW GROUND.
iyy W E PROPOSED GRASS LI ED
EMERGENCY SPILLWAY WJ 4:a SIDE SLO ES
AND CREST ELEV.=S i.3 /
8'WIDE TOP. OF DAM ELEV: 592.27
i14/ t592.27+
5 0
DETENTION BASIN DETAIL: SCALE 1"=20'
ALBERMARLE COUNTY AS -BUILT CHECKLIST:
4 COUNTY OF ALBEMARLE
Department of Community Development
0t'/�tP
Construction Record Drawings (As -built) for VSMP
\ s96
S94
OF BASIN = 587.00
59z
The following is a list of information required on construction record drawings for
stormwater facilities (reference Water Protection Ordinance 17-422). It is preferable that the
construction record drawing be prepared by someone other than the designer. Please do not
provide design drawings as construction record drawings.
A. A signed and dated professional seal of the preparing engineer or surveyor.
B. The name and address of the firm and individual preparing the drawings on the title sheet.
C. The constructed location of all items associated with each facility, and the inspection records to verify
proper dimensions, materials and installation. The items include, but are not limited to the following:
1. Inspection Records and photographs for pipe trenches and bedding, including underdrains.
2. Video Pipe Inspection for any pipes which are not accessible or viewable.
3. Updated Location with geo-coordinates of all facilities.
4. Verified Drainage Area maps for the drainage area treated, and for drainage to the facilities.
5. Current physical and topographic surve for all earthen structures. Ponds should include a survey
P YY Y
of the pond bottom. Surveys should verify pond volumes are per design. Corrections may be required
for alterations from the design.
6. Plants location and type.
t YP
7. Plans and profiles for all culverts, Pipes, Risers, Weirs and Drainage Structures - Display the
installed type of drainage structures, culvert/pipe size, weirs, materials, inlets or end treatment(s),
inlet and outlet protection, alignment and invert elevations compared to design.
8. Computations: For significant deviations from design, provide sealed computations verifying that
the as -built condition is equivalent or better than design.
9. Ditch Lines - Display the constructed location of all ditch lines and channels, including typical
sections and linings.
10. Easements - Show all platted easements with dead book references labeled. Facilities and drainage
must be within platted easements. Provide copies of recorded documents.
11. Guardrail, fences or other safety provisions - Display the constructed location of all safety
provisions; fences, guardrail, including the type, length and applied end treatments, compared to
design.
12. Material layers - biofilter media, stone layers, sand layers, keyways and cores must be verified as to
material types and depths. Include inspection reports, boring or test pit reports and materials
certifications. Biofilter media must be an approved state mix.
13. Access roads - show location of access roads, surface treatment, drainage, etc, as applicable.
14. Compaction reports are required to verify fill compaction in dams.
15. Manufacturers certifications for proprietary BMP's certifying proper installation and functioning.
SCOTT/R. Cb�LLINS'Z
Lie. No. 035791 �
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I I 1 R - - { \ PRIVATE DRAINAGE EASEMENT / / / /
8"HDPE ROOF DRAIN SYSTEM 6 w r N / / 319 e I NOTE: ALL TH UNITS SHALL HAVE ROOF
1 ° I o \* i i 6 62 o REAL PROP o / / / ° h Cn
I \ I G� � � � A � I , �_ � b e � 6 i� G � � w I 1 DRAIN SYSTEMS THAT WILL COLLECT THE � / / / / ( `O h°' �
\ 6 1 ^ 6I° 0' / / PROPERTY INC
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GAR 68g.i7 0/ I i I - 7 I FFE=68y.83 I � - - 33 ,., --_
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/N GRAPAIC SCALE JOB NO.
NOTE: ALL PUBLIC WATERLINE /F GARY D OR MYRTLE BROOKS I I I I I I I I I / / / 112066
NOTE: ALL PUBLIC WATER AND SEWER / DB 1191 PC 396
I EASEMENTS SHALL BE PLATTED PRIOR I I I I 30 0 0 30 so izo
- - - - FACILITIES SHALL BE DEDICATED TO / / _ SCALE
/ / � TO FINAL SITE PLAN APPROVAL / I I I I // � I �� 3
THE ALBERMARLE COUNTY SERVICE � / / I 1 = O
1 I 1 AUTHORITY / / / / I I I I I I I I I ( IN FEET ) SHEET NO.
/inch /= 30 /ft. 1�