HomeMy WebLinkAboutWPO201600060 Plan - E&S WPO VSMP 2017-03-03VICINITY MAP: 1" = 500' GENERAL EROSION & SEDIMENT CONTROL NOTES SHEET INDEX
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MAINTENANCE NOTES
IN GENERAL, ALL EROSION AND SEDIMENT CONTROL MEASURES WILL BE CHECKED DAILY AND AFTER EACH SIGNIFICANT
RAINFALL. THE FOLLOWING ITEMS WILL BE CHECKED IN PARTICULAR.
1. THE INLET PROTECTION WILL BE CHECKED REGULARLY FOR SEDIMENT CLEANOUT.
2. THE GRAVEL OUTLETS WILL BE CHECKED REGULARLY FOR SEDIMENT BUILDUP WHICH WOULD PREVENT DRAINAGE. IF THE
GRAVEL IS CLOGGED BY SEDIMENT, IT SHALL BE REMOVED AND CLEANED OR REPLACED.
3. THE SILT FENCE BARRIER WILL BE CHECKED REGULARLY FOR UNDERMINING OR DETERIORATION OF THE FABRIC. SEDIMENT
SHALL BE REMOVED WHEN THE LEVEL OF SEDIMENT DEPOSITION REACHES HALF WAY TO THE TOP OF THE BARRIER.
4. THE SEEDED AREAS WILL BE CHECKED REGULARLY TO ENSURE THAT A GOOD STAND IS MAINTAINED. AREAS SHALL BE
FERTILIZED AND RESEEDED AS DETERMINED NECESSARY BY VIRGINIA TECH SITE DEVELOPMENT DEPARTMENT.
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 AS U PPLEMENTARY EROSION CONTROL PLAN TO THE OWNER FOR
REVIEW AND APPROVAL BY THE PLAN APPROVING AUTHORITY.
6. THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY ADDITIONAL EROSION CONTROL MEASURES NECESSARY TO PREVENT EROSION AND SEDIMENTATION AS DETERMINED BY THE PLAN APPROVING AUTHORITY.
7. ALL DISTURBED AREAS ARE TO DRAIN TO APPROVED SEDIMENT CONTROL MEASURES AT ALL TIMES DURING LAND DISTURBING ACTIVITIES AND DURING SITE DEVELOPMENT UNTIL FINAL STABILIZATION IS ACHIEVED.
8. DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN APPROVED FILTERING DEVICE.
9. THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES PERIODICALLY AND AFTER EACH RUNOFF -PRODUCING RAINFALL EVENT. ANY NECESSARY REPAIRS OR CLEANUP TO MAINTAIN THE EFFECTIVENESS OF THE EROSION CONTROL DEVICES SHALL BE MADE
IMMEDIATELY.
10. ALL FILL MATERIAL TO BE TAKEN FROM AN APPROVED, DESIGNATED BORROW AREA.
11. ALL WASTE MATERIALS SHALL BE TAKEN TO AN APPROVED WASTE AREA. EARTH FILL SHALL BE INERT MATERIALS ONLY, FREE OF ROOTS, STUMPS, WOOD, RUBBISH, AND OTHER DEBRIS.
12. BORROW OR WASTE AREAS ARE TO BE RECLAIMED WITHIN 7 DAYS OF COMPLETION PER ZONING ORDINANCE SECTION 5.1.28.
13. ALL INERT MATERIALS SHALL BE TRANSPORTED IN COMPLIANCE WITH SECTION 13-301 OF THE CODE OF ALBEMARLE.
14. BORROW, FILL OR WASTE ACTIVITY INVOLVING INDUSTRIAL -TYPE POWER EQUIPMENT SHALL BE LIMITED TO THE HOURS OF 7:00 AM TO 9:00 PM.
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 50/50 MIX OF ANNUAL RYE GRASS AND CEREAL WINTER RYE, OR IN MARCH AND APRIL TO CONSIST
OF ANNUAL RYE, OR MAY THROUGH AUGUST TO CONSIST OF GERMAN MILLET. STRAW MULCH IS TO BE APPLIED AT 80LBS/100SF. ALTERNATIVES ARE SUBJECT TO APPROVED BY THE COUNTY EROSION CONTROL INSPECTOR.
18. PERMANENT STABILIZATION SHALL BE LIME AND FERTILIZER, PERMANENT SEEDING, AND MULCH. AGRICULTURAL GRADE LIMESTONE SHALL BE APPLIED AT 90LBS/1000SF, INCORPORATED INTO THE TOP 4-6 INCHES OF SOIL. FERTILIZER SHALL BE APPLIED AT 1000LBS/ACRE AND CONSIST
OF A 10-20-10 NUTRIENT MIX. PERMANENT SEEDING SHALL BE APPLIED AT 180LBS/ACRE AND CONSIST OF 957o KENTUCKY 31 OR TALI_ FESCUE AND 0-5% PERENNIAL RYE GRASS OR KENTUCKY BLUEGRASS. STRAW MULCH IS TO BE APPLIED AT 80LBS/100SF. ALTERNATIVES ARE SUBJECT
TO APPROVED BY THE COUNTY EROSION CONTROL INSPECTOR.
19. MAINTENANCE: ALL MEASURES ARE TO BE INSPECTED WEEKLY AND, AFTER EACH RAINFALL. ANY DAMAGE OR CLOGGING TO STRUCTURAL MEASURES IS TO BE REPAIRED IMMEDIATELY. SILT TRAPS ARE TO BE CLEANED WHEN 50% OF THE WET STORAGE VOLUME IS FILLED WITH
SEDIMENT. ALL SEEDED AREAS ARE TO BE RESEEDED WHEN NECESSARY TO ACHIEVE A GOOD STAND OF GRASS. SILT FENCE AND DIVERSION DIKES 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 ORDINANC E SECTION 17-207B.
CONSTRUCTION SEQUENCE
STAGE 'A'
1. CLEARLY MARK LIMITS OF WORK.
2. INSTALL CONSTRUCTION ENTRANCE, CONSTRUCTION ACCESS ROAD, AND INLET PROTECTION ON EXISTING DROP INLET ADJACENT TO CONSTRUCTION ENTRANCE AS SHOWN ON THE PLAN. UTILIZE NEARBY FIRE HYDRANT FOR TIRE WASHING.
3. INSTALL PERIMETER SILT FENCING AND TEMPORARY DIVERSION DIKE: ADJACENT TO CONSTRUCTION ENTRANCE, AND ALL OTHER PERIMETER MEASURES AS SHOWN ON THE PLAN.
4. ESTABLISH STAGING AREA AND STOCKPILE AREA AS SHOWN ON PLAN.
5. INSTALL EXTENSION OF EXISTING 54" CONCRETE CULVERT PIPE, PROPOSED STORM STRUCTURES A3, A4, A5, AND A6 AS SHOWN ON THE APPROVED SITE PLAN, AND RE-ROUTE THE EXISTING DRAINAGE WAY TO STRUCTURE A6 AS SHOWN ON THE PLANS. PROVIDE RIP RAP
STABILIZATION AT THE ENTRANCE TO STRUCTURE A6. CLEAR ONLY THE AREA REQUIRED FOR INSTALLATION OF THE 54" RCP. ALSO INSTALL STORMDRAIN SYSTEM 'C'.
6. BACK FILL 54" RCP, FORM BIO-FILTER # 1 BASIN SHAPE AND INSTALL INLET PROTECTION ON NEWLY INSTALLED STORM DRAIN STRUCTURES. DO NOT INSTALL BIO-FILTER COMPONENTS!
7. CLEAR REMAINING BUILDING PAD AREA, INSTALL RETAINING WALL ADJACENT TO NEW 54" RCP, AND BEGIN FILLING BUILDING PAD ZONE,
8. INSTALL SILT FENCE AT TOP OF RETAINING WALL AND SPILT BUILDING PAD RUNOFF EVENLY TO THE FRONT AND REAR SILT FENCE.
9. COMPLETE BUILDING PAD CONSTRUCTION AND BEGIN BUILDING CONSTRUCTION. PROCEED TO STAGE 'B' OF THE E&SC PLAN.
STAGE 'B'
10, INSTALL REMAINING STORM DRAIN STRUCTURES AND P!P!NG AND ESTABLISH ROUGH FINISH GRADES OF FRONT PARKING LOT INCLUDING BIO-FILTER #2 AND DRY-SWAL SHAPES. DO NOT INSTALL BICO-FILTER COMPONENTS!
11. INSTALL INLET PROTECTION ON ALL NEW STORM STRUCTURES.
12. INSTALL ALL OTHER SITE PLAN UTILITIES.
L B SE GRAVEL AND CURB NG IN AREAS TO BE PAVED AND BEGIN ESTABLISHMENT OF VEC'ETATION ON ALL DISTURBED TURF AREAS WITH PERMANENT SEEDING OR SODDING MULCHING FERTILIZATION AND LIMING AMEND
EROSION & SEDIMENT CONTROL PLAN - STAGE 'A'
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EROSION & SEDIMENT CONTROL PLAN -STAGE'B'
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STORMWATER MANAGEMENT PLAN
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STORMWATER MANAGEMENT DETAILS
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ALTH OF
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Alan ranklin
Lie. No. 35326 W
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sIONAL
E&SC MEASURES
CE
CONSTRUCTION ENTRANCE:
E&SC STD. 3.02
professional seal
CONSTRUCTION ROAD STABILIZATION
E&SC STD. 3.03
ALAI`J FRANKLIN, PE
SF
SILT FENCE
E&SC STD. 3.05
project manager
IP
STORM DRAIN INLET PROTECTION
E&SC STD. 3.07
JESSE CALDER
DD
TEMPORARY DIVERSION DIKE
E&SC STD. 3.09
project team
OP
OUTLET PROTECTION
E&SC STD. 3.18
SD
SUBSURFACE DRAIN
E&SC STD. 3.28
TO
TOPSOILING
E&SC STD. 3.30
TS
TEMPORARY SEEDING:
E&SC STD. 3.31
PS
PERMANENT SEEDING:
E&SC STD. 3.32
MULCHING
E&SC STD. 3.35
B/M
SOIL STABILZATION BLANKETS & MATTING
E&SC STD. 3.36
DC
DUST CONTROL
E&SC STD. 3.39
13. AS FINAL GRADES ARE REACHED, INSTAL A I
SOILS WHERE NEEDED. CONSULT WITH LANDSCAPE ARCHITECT BEFORE ESTABLISHING VEGETATION. SOILS GROUP 27B - ELIOAK LOAM, 2 TO 7 % SLOPES, HSG B
SOILS GROUP 27D - ELIOAK LOAM, 15 TO 25 % SLOPES, HSG B
14. ONCE REMAINDER OF SITE HAS BEEN DEEMED STABILIZED BY THE COUNTY INSPECTOR AND ALL CONSTRUCTION ACTIVITIES ARE COMPLETED, RESTORE STAGING AND ACCESS AREAS TO ACCEPTABLE (PRE -CONSTRUCTION) CONDITIONS, INSTALL BIO-FILTER MEDIA, SOILS GROUP 34B - GLENELG LOAM, 2 TO 7% SLOPES, HSG B
GRAVEL, UNDERDRAINS, AND PLANTINGS, AND REMOVE ALL OTHER EROSION CONTROL MEASURES. SOILS GROUP 34C - GLENELG LOAM, 7 TO 15% SLOPES, HSG B
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REGION TEN
W0MEN'S SHELTE
project name
REGION 10 COMMUNITY
SERVICES BD, INC.
client
502 OLD LYNCHBURG ROAD
CHARLOTTESVILLE, VIRGINIA 22903
project address
NA
project number
VSMP: E&SC/SWM PLAN
project phase
SEPTEMBER, 19, 2016
issue date
1 12/07/16 CO. COMMENTS
revisions
EROSION &
SEDIMENT CONTROL
PLAN - STAGE W
sheet title
EC001
sheet number
Ni
21,
a
NOTES
A ANCHOR SLOT
APPROXIMATELY 200 STAPLES REQUIRED
"10 PER 100 SQ. YDS. OF MATERIAL ROLL.
ANCHOR SLOTS, JUNCTION SLOTS &
CHECK SLOTS TO BE BURIED 6" TO 12".
K.
Ai -I 12" MAX. 4:1 OR FLATTER
6" MAX. STEEPER THAN 4.
EDGE AND END JOII
z 474
TO BE SNUGLY ABU
JUNCTION SLOT
(JUTE MESH WILL H
CHECK SLOT*
STAPLED LAP JOINT
LIEU OF EDGE JOIN
TERMINAL FOLD
LAP JOINT 2" MIN.
5'MAX. 4:1 OR Ft
(JUTE MESH ONLY)
TMAX. STEEPEF
-TAMP FIRMLY
ANCHOR SLOT
0
*CHECK SLOT
V' TO 2"
olr��
-TAMP
FIRMLY CHECK SLOT z VAR. VAR.
0 PLAN VIEW
0 STAPLING DIAGRAM
-R
Qz�
*CHECK SLOTS AT MIN.
STAPLE FORMED FROM NO. 11 STEEL WIRE. 50'C-C INTERVALS;
8" STAPLE MIN. LENGTH FOR SANDY SOIL. NOT IREWD WITH ALL
JUNCTION SLOT 6" STAPLE MIN. LENGTH FOR OTHER SOIL. "COMBINATION" BLANKETS
V 12" TAMP TERMINAL FOLD
FIRMLY
4" -TAMP FIRMLY
iV
.... .... ... 2"
6TMi MWAI I I M Ll to] SWA
, INQ
OHE
OHE
?2
WT
O
rDRAINAGE SWALE DIRECTS FLOW
TO SEDIMENT BASIN
70'MIN.
3" SM-2A ASPHALT TOP COURSE
AEXISTING
2% PAVEMENT
. .... -77
DIVERSION DITCH A)T #21 A
AGGREGATE BASE
SIDE ELEVATION
EXISTING GROUND
70'MIN.
10' MIN.
ASPHALT PAVED WASHRACK
12%
12 MIN. EXISTING
PAVEMENT
20% 2%
DIVERSION DITCH MIN.--/ ��POSITIVE DRAINAGE 10'MIN
WIDTH AT DESIGN WATER TO SEDIMENT
ELEVATION IS 4.0' TRAPPING DEVICE
MUST EXTEND FULL WIDTH SET 1Y2" WATER HYDRANT WITH
OF INGRESS AND EGRESS FROST PROOF HYDRANT 3'
OPERATION 70'MIN. ABOVE GRADE AND 4' OFF
2% EDGE OF PAVEMENT
11. 7 i 71-,77
_i_7 7- . ....
4, . .. .... . .....
NOTE: A MINIMUM WATER TRAP OF 1" IS REQUIRED
WITH A MINIMUM WASH HOSE DIA. OF 1.5"
SECTION A -A
PAVED CONSTRUCTION ENTRANCE
SOURCE: Adapted from Installation of Straw and Fabric Filter Barriers for Sediment Control
Sherwood & Wyant PLATE. 3.05-1
1. SET POSTS AND EXCAVATE A 4"X4" 2. STAPLE WIRE FENCING TO THE POSTS.
TRENCH UPSLOPE ALONG THE LINE
OF POSTS.
Jill
FLOW
4
3. ATTACH THE FILTER FABRIC TO THE WIRE 4. BACKFILL AND COMPACT THE
FENCE AND EXTEND IT INTO THE TRENCH, EXCAVATED SOIL,
FLOW
EXTENSION OF FABRIC AND WIRE INTO THE FRENCH,
CONSTRUCTION OF A SILT FENCE
(WITH WIRE SUPPORT)
STA 7E ROUTE 780
OLD L YNCHBURG ROAD
RUNOFF
WATER
WITH
SEDIMENT
SEDIMENT
WIRE SCREEN
r- FILTERED WATER
OVERFLO1�
-T-dil - -1
SPECIFIC APPLICATION
DROP INLET
WITH GATE
THIS METHOD OF INLET PROTECTION IS APPLICABLE WHERE
HEAVY FLOWS ARE EXPECTED AND WHERE AN OVERFLOW
CAPACITY IS NECESSARY TO PREVENT EXCESSIVE PONDING
AROUND THE STRUCTURE.
GRAVEL SHALL BE VIDOT #3, #357 OR #5 COARSE AGGREGATE.
DROP INLET PROTECTION
ACCEPTABLE TEMPORARY SEEDING PLANT MATERIALS
QUICK REFERENCE FOR ALL REGIONS
RATE
PLANTING DATES SPECIES (LBS/ACRE)
SEPT. 1- FEB. 15 50/50 MIX OF ANNUAL
RYEGRASS & CEREAL
WINTER RYE 50-100
FEB. 16 - APR. 30 ANNUAL RYEGRASS 60-100
MAY 1 -AUG. 31 GERMAN MILLET 50
91111MIM
SITE SPECIFIC SEEDING MIXTURES FOR COASTAL PLAIN AREA
Total Lbs.
Per Acre
Minimum Care Lawn
- Commercial or Residential
- Kentucky 31 or Turf -Type Tall Fescue
175-200 tbs.
or
- Common Bermudagrass
75 tbs.
High -Maintenance Lawn
Kentucky 31 or Turf -Type Tall Fescue
200-250 tbs.
or
Hybrid Bermudagrass (seed)
40 tbs. (unhulled)
or
30 lbs.,(hulled)
Hybrid Bermudagrass (by other vegetative
establishment method, see Std. & Spec. 3.34)
General Slope (3:1 or less)
- Kentucky 31 Fescue
128 tbs.
- Red Top Grass
2 tbs.
- Seasonal Nurse Crop
20 tbs.
150 tbs.
Low Maintenance Slope (Steeper than LJ1
- Kentucky 31 Tall Fescue
93-108 tbs.
- Common Bermudagrass
0-15 tbs.
- Red Top Grass
2 tbs.
- Seasonal Nurse Crop
20 tbs.
- Sericea Lespedeza
20 tbs.
150 tbs.
Use seasonal nurse crop in accordance with seeding dates as stated below:
February, March through April ...............
Annual Rye
May 1st through August ....................
Foxtail Millet
September, October through November 15th
..... Annual Rye
November 16tb through January ..............
Winter Rye
May through October, use hulled seed. All other seeding
periods, use
unhulled seed. Weeping Lovegrass may be added to
any slope or low -
maintenance mix during warmer seeding periods; add 10-20 lbs./acre in mixes.
PERMANENT SEEDINIO_
SOURCE: \01\. DSWC
PLATE 3.09-1
r'nmnf4 CZn;l
J
�4.5' min.{
TEMPORARDIVERSION DIKE
SOILS INFO:
I LIMHUNAKY ti L L U I N U SOILS GROUP 27B - ELIOAK LOAM, 2 TO 7 % SLOPES, HSG B
SOILS GROUP 27D - ELIOAK LOAM, 15 TO 25 % SLOPES, HSG B
SOILS GROUP 34B - GLENELG LOAM, 2 TO 7% SLOPES, HSG B
SOILS GROUP 34C - GLENELG LOAM, 7 TO 15% SLOPES, HSG B
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8"PVC OUT 413.67
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TOP 416.35 8"
D110 IN 413.39 8
PVC OUT 41323
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.. ......;_�CONSTRUCTION ENTRANCE: E&SC STD. 3.02
.... . 3 rLO"qP_90 0
. . . . . . . . CONSTRUCTION ROAD STABILIZATION E&SC STD. 3.03
SILT FENCE E&SC STD. 3.05
X
STORM DRAIN INLET PROTECTION E&SC STD. 3.07
>T P ROJT' LIMITS OF�,,- @ TEMPORARY DIVERSION DIKE E&SC STD. 3.09
tm x1i I ECI (
DiSTORBANCE,
"JYP.
1,,S AC.} OUTLET PROTECTION E&SC STD. 3.18
SUBSURFACE DRAIN E&SC STD. 3.28
L
r)
if TO TOPSOILING E&SC STD. 3.30
z TEMPORARY SEEDING: E&SC STD. 3.31
OUT
3R, . (q PS PERMANENT SEEDING: E&SC STD. 3.32
X
SOIL 34B
$ MULCHING E&SC STD. 3.35
SILT F NCE
SOIL STABILZATION BLANKETS & MATTING E&SC STD. 3.36
2V,DRA, DRAINAGE 1iEMSNT
OR. 70, 87)9'ZAT
TA TE 64 DUST CONTROL E&SC STD. 3.39
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Alan G. Franklin
Lie. No. 35326
0 ?V A L
professional seal
ALAN FRANKLIN, PE
project manager
JESSE CALDER
project team
I- �
project name
REGION 10 COMMUNITY
SERVICES BD, INC.
client
502 OLD LYNCHBURG ROAD
CHARLOTTESVILLE, VIRGINIA 22903
project address _:/
NA
project number
VSMP: E&SC/SWM PLAN
project phase
SEPTEMBER, 19, 2016
issue date
1 12/07/16 CO. COMMENTS
revisions
EROSION &
SEDIMENT CONTROL
PLAN - STAGE"B"
sheet title
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sheet number
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EASEMENT, TYP.*
SUB-DA TO BIO-FILTER # 1 (D.A. "A")
(6S in the storm model)
D.A. = 1.06 Ac.
0.16 Ac. CN 61 (Managed Turf, HSG B)
0.66 Ac. CN 55 (Forest/Open Space, HSG B)
0.24 Ac. CN 98 (Impervious Area, HSG B)
Weighted CN = 66
Weighted CN Adjusted for RR = 63 (Iyr)
Weighted CN Adjusted for RR = 64 (2yr)
Weighted CN Adjusted for RR = 65 (IOyr)
POST -DEVELOPMENT TOTAL
D.A. = 1.88 Ac.
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} . THE GUIDANCE SET FORTH BY DEQ IN THE VIRGINIA
} NOUT
', 4 393.88 w STORMWATER MANAGEMENT PROGRAM. THE AREAS WILL
\ -�11, `` ' REMAIN UNDISTURBED IN A NATURAL, VEGETATED STATE,
ST j `/POINT OF ANALYSIS = EXCEPT FOR ACTIVITIES AS APPROVED BY THE LOCAL
I" / EX. 54" RCP
t, � ', �/ PROGRAM AUTHORITY, SUCH AS FOREST MANAGEMENT,
/ O'DRA/h-Q(1)PostDev= 0.05 cfs
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`� !7.B'21oaT Q(2)Postoev = 0.40 cfs TATE64 REVEGETATWG, PASSIVE RECREATION (E.G. ,TRAILS), AND
�`; \ Q(10)PostDev = 3.06 cfs
g� i , , LIMITED BUSH HOGGING TO MAINTAIN DESIRED VEGETATIVE
r� C �%, COMMUNITY (BUT NO MORE THAN FOUR TIMES A YEAR).
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4r3 (8S in the storm model)
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t _ \`< ,0.13 Ac. CN 55 (Forest/Open Space, HSG B)
T. ..""„.
's Weighted CN = 57
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' R-75 RESIDENTIAL
POST -DEVELOPMENT
WATERSHED LIMIT, TYP.
0 15' 30' 45'
(SEE SUPPORTING DOCUMENTS SUBMITTED SEPARATELY)
PRE -DEVELOPMENT RUNOFF
D.A. =1.88 Acres
tc - 13.30 Minutes
CN=56
Q (1) Pre -Developed = 0.20 Cfs
RV(1)Pre-Developed = 1,500 cf
Q(2)Pre-Developed - 0.65 Cfs
Q(10)Pre-Developed = 3.02 cfs
POST -DEVELOPMENT RUNOFF
D.A. = 1.88 Acres
tc - 13.30 Minutes
CNAd•usted for RR = 64
1
Q(] )Developed w/ Adjusted CN Prior to SWM Routing = 0.90 CfS
RV(1)Developed w/ Adjusted CN = 3,199 cf
Proposed Post -Development BMPs
BioFilter # 1 (Level 1)
BioFilter #2 Level 1
Dr wal Lev I 1
S e e
Y ( )
Post Development Runoff after BMP Routing
F + +
BioFilter # 1 Biofilter #2 Dr w l n t r r n
( Y
S a e U ca u ed u off
p )
Q(1)POStDev= 0.05 cfs
Q(2)POStDev - 0.40 Cfs
Q (10) PostDev = 3.06 cfs
VSMP CHANNEL PROTECTION CRITERIA
Q(1)Allowable - I.F. X [Q(1)Pre-Developed X RV(1)Pre-Developed]/RV(1)Developed Adjusted
Where:
I.F. = 0.9
Q(1)Pre-Developed = 0.20 cfs
RV(1)Pre-Developed = 1,500 cf
RV (1) Developed Adjusted = 3,199 cf
Q(1)Allowable = 0.9. X [0.20 X 1 ,500]/3,199 = 0.08 cfs
Q (1) PostDev - 0.05 Cfs < Q (1)Allowable = 0.08 cfs
(CRITERIA MET)
NO FURTHER ANALYSIS REQUIRED
FLOOD PROTECTION CRITERIA
Q(2)PostDev = 0.40 CfS < Q(2)Pre-Developed = 0.65 cfs
Q(10)PostDev = 3.06 CfS > Q(10)Pre-Developed = 3.02 Cfs*
*NO KNOW HISTORY OF LOCALIZED FLOODING
(CRITERIA MET)
NO FURTHER ANALYSIS REQUIRED
SWM PLAN NARRATIVE
The Point of Analysis for the pre/post stormwater runoff comparison is an existing 54" RCP culvert under Old Lynchburg Place at the downstream
property boundary. The stormwater management plan for this project consists of a combination of two Level 1 bio-filters, and one Level 1 dry
swaile facility to capture, treat, and manage developed/undeveloped project site runoff and an extension of the the existing 54" pipe system to
conivey/bypass existing runoff through/under the site development. Site runoff will be directed via roofdrains, sheet flow from existing slopes, and
surface flow curb cuts to the proposed BMPs which have been designed and sized to provide adequate phosphorous removal and adequate
reduction of post -development storm runoff rates to below pre -development rates as indicated above.
WATER QUALITY CONTROL
The Water Quality Control Plan is to capture and treat a majority of the developed site runoff in two Level 1 bio-filters, and one Level 1 dry
swale, via sheet flow, with gravel diaphragms, filter strips, and two grass swales wtih gravel pre-treatment cells that convey developed site
runoff to a 4,066 square foot Bio-fiter (Level 2).
D.A. "A" - Bio-Filter #1 Water Quality Volume
Tv = 944 cf from s readsheet
( p )
Bio-filter Surface Area Required (Level 1)
SARequired = (Tv - RR from upstream practice)/Storage Depth = (944/1.40)= 674 sf
where:
Storage Depth = 0.25 x biomedia depth (2.0') + 0.40 x gravel depth (1') + 1.0 x ponding depth (0.5') = 1.40
SAProvided = 1,785 sf > SARequired = 674 sf
D.A. "B" - Bio-Filter #2 Water Quality Volume
Tv = 721 cf (from spreadsheet)
Bio-filter Surface Area Required (Level 1)
SARequired = (Tv - RR from upstream practice)/Storage Depth = (721/1.40) = 515 sf
where:
Storage Depth = 0.25 x biomedia depth (2.0') + 0.40 x gravel depth (1') + 1.0 x ponding depth (0.5') = 1.40
SAProvided = 868 sf > SARequired = 515 sf
D.A. "C" - Dry Swale Water Quality Volume
Tv = 36 cf (from spreadsheet)
Dry Swale Surface Area Required (Level 1)
SARequired = (Tv - RR from upstream practice)/Storage Depth = (36/1.40) = 25 sf
where:
Storage Depth = 0.25 x biomedia depth (2.0') + 0.40 x gravel depth (1') + 1.0 x ponding depth (0.5') = 1.40
SAProvided = 138 sf > SARequired = 25 sf
TP Load Reduction Required = 0.43 Ibs/yr
SWM Plan Exceeds Target Phosphorous Reduction by 0.15 Ibs/yr
(CRITERIA MET)
Land that will remain undisturbed OR that will be restored to a hydrologically functional state:
Portions of residential yards that will NOT be disturbed during construction
Portions of roadway rights -of -way that, following construction, will be used as filter strips, grass
channels, nor stormwater treatment areas; MUST include soil restoration or placement of engineered
soil mix as per the design specifications
• Community open space areas that will not be mowed routinely, but left in a natural vegetated state
(can include areas that will be bush hogged no more than four times per year)
• Utility rights -of -way that will be left in a natural vegetated state (can include areas that will be bush
hogged na more than four times per year)
Surface area of stormwater BMPs that are NOT wet ponds, have some type of vegetative cover, and
that do not replace an otherwise impervious surface. BMPs in this category include bioretention, dry
swale, grass channel, ED pond that is not mowed routinely. stormwater wetland, soil amended areas
that are vegetated, and infiltration practices that have a vegetated cover.
• Other areas of existing forest and/or open space that will be protected during construction and that will
remain undisturbed. These include wetlands.
Operational & Management Conditions for Land Cover in Forest & Open Space Category:
. Undisturbed portions of yards, community open space, and other areas that will be considered as
forest/opeon space must be shown outside the LOD on approved E&S plans AND demarcated in the
field (e.g., fencing) prior to commencement of construction.
• Portions oif roadway rights -of -way that will count as forest/open space are assumed to be disturbed
during conlstruction, and must follow the most recent design specifications for soil restoration and, if
applicable, site reforestation, as well as other relevant specifications if the area will be used as a filter
strip, grass channel, bioretention, or other BMP
All areas tlhat will be considered forest/open space for stormwater purposes must have documentation
that prescribes that the area will remain in a natural, vegetated state. Appropriate documentation
includes: subdivision covenants and restrictions, deeded operation and maintenance agreements and
plans, paricel of common ownership with maintenance plan, third -party protective easement, within
public right-of-way or easement with maintenance plan, or other documentation approved by the local
program authority
While the agoal is to have forest/open space areas remain undisturbed, some activities may be
prescribed in the appropriate documentation, as approved by the local program authority: forest
management, control of invasive species, replanting and revegetation, passive recreation (e.g,, trails),
limited bush hogging to maintain desired vegetative community, etc.
I+.r��!��.ap- ardiii erctlure I C_:vil ,-',;girlie. r g
r � E I:!�';€! ',tre, v ' S � ':'.�':; I }lv.l'IGt F S`s,i':, <-
�0Hop�
o t ��
o ,tee
U y
Alan G. Franklin
''t7 N�
Lic. No. 35326
7 114
W,
�
sY-ONAL �
rofessional seal
p
ALAN FRANKLIN PE
project manager
JESSE CALDER
project team
REGION TEN
WOMEN'S SHELT
project name
REGION 10 COMMUNITY
SERVICES BD, INC.
client
502 OLD LYNCHBURG ROAD
CHARLOTTESVILLE, VIRGINIA 22903
project address
NA
project number
COUNTY VSMP SET
project phase
SEPTEMBER 19, 2016
issue date
1 12/07/16 CO. COMMENTS
revisions
STORMWATER
MANAGEMENT L
sheet title
POST DEVELOPMENT DRAINAGE AREA MAP
FOREST/OPEN SPACE MAINTENANCE REQUIREMENTS
SCALE : NTS
•
sheet number
RETAINING WALL W/ RAIL
Table 9.6. Bioretention Material Specifications
6" PERFORATED SCHEDULE 40 PVC PIPE OR EQUIVALENT WITH CLEANOUTS
EVERY 50'(MIN), TYP.
1. 3/8" PERFORATIONS @ 6" O.C.
2. PLACE TWIDE STRIP OF FILTER FABRIC AT BOTTOM OF PEA GRAVEL
OVER UNDERDRAIN, TYP.
1 SEE PLAN VIEW.
4. SUB -SOIL TESTING, ONE PER 1,000 SF OF FILTER SURFACE, REQUIRED
TO REMOVE UNDERDRAINS.
PARKING LOT
72"O DOGHOUSE MANHOLE
W/ VDOT STD. MH RISER
CONE & 24" TRASH RACK FOR
BIO-FILTER OVERFLOW
RIM 411.50
INV. IN 407.50 (6")
INV. IN 406.00 (15")
INV. 401.10 (EX.54")
BIO-MIEDIA MIX SPECIFICATION
* 85% - 88% SAND
0 8% -12% SOIL FINES
* 3% - 5% ORGANIC MATTER IN THE FORM OF
LEAF COMPOST
* THE VOLUME OF FILTER MEDIA BASED ON
1 1 0% OF THE PLAN VOLUME, TO ACCOUNT FOR
SETTLING OR COMPACTION
EX. 54" RCP
REPLACE EX. STORM GRATE TOP
W/ VDOT STD. MH-1 RISER CONE
& 24" TRASH RACK
RIM 412.50 -------"\
INV. IN 408.35 (15")
SEE LANDSCAPE PLAN FOR PLANTING SCHEDULE INV. IN 403.35 (54")
BIO-MIEDIA MIX SPECIFICATION PLANTING TEMPLATE TO INCLUDE TURF, HERBACEOUS INV. OUT 403.25 (54")
:85% - 88% SAND VEGETATION, SHRUBS, AND/OR TREES TO ACHIEVE
8% -12% SOIL FINES SURFACE AREA COVERAGE OF AT LEAST 90% WITHIN 2 \
0 3% - 5% ORGANIC MATTER IN THE FORM OF YEARS. IF USING TURF, MUST COMBINE WITH OTHER TYPES RAMP GROUND TO
LEAF COMPOST OF VEGETATION. RISER CREST
0 THE VOLUME OF FILTER MEDIA BASED ON
1 1 0% OF THE PLAN VOLUME, TO ACCOUNT FOR 6" SOLID PVC RISER AND
SETTLING OR COMPACTION
K I
%.,
CLEANOUT WITH VENTED
LID, TYP. _2-_YFaTQRM ELF-\/- 41Z53_V_
BOTTOM ELEV. 412.00
I "I � ,:�, 1, I . I'll .. 1. I -�, ,� " �\ � I � .1.11 I .
- I � 1�', I '. � _ � W,��,\
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.1
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_ - 1, I -_ I 'i .
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� .11 . ., I . . - � I . ..,.'', . I .1 q . .. I .. . . . I
..I ..
I 24"
4" B. 0I1O. . -. M� 1. ED�� IA. .. � . MIX
. . (ALLOW FOR SETTLING)
.-.I.
.
II .
�
1. 1
1.. I1 1
"-12" #5 STONE DOUBLE WASHED
Tb [".'�
-� ,-
,3 PEA n" � �.i II ���,����.\,%,,,� ,�.,'_"-_t _V�
I
I,
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'
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,
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.
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RAMP GROUND TO
RISER CREST
r=4�z -�,sue_-_In�1--�---M�ll-A-Z�:�,y�--L .&lrl._-�-1-` l-RIV�,-�-,--
TRANSITION TO SOLID PVC
PIPE WITHIN 3' OF RISER
EX. 54" RCP
.
(7B10-FILTER #1_
SW.02 SCALE: NTS
11�
SEE LANDSCAPE PLAN FOR PLANTING SCHEDULE
PLANTING TEMPLATE TO INCLUDE TURF, HERBACEOUS
VEGETATION, SHRUBS, AND/OR TREES TO ACHIEVE
SURFACE AREA COVERAGE OF AT LEAST 90% WITHIN 2
YEARS. IF USING TURF, MUST COMBINE WITH OTHER TYPES
OF VEGETATION.
_-I _.
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,
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_
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- -7 2-1RU43L ELF-41 L56-
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: . : B: O� � I T� TI O� MI � � �E1. L� . EV�.� . I 4� . 1 . 1I.0.0 I . . .. I I �. . I MULCH LAYER P .I . �
a.
.
I � � .I �
I � .
.�
I
.I
.� I.
. .24" BIO-MEDIA MIX . .
(ALLOW FOR SETTLING) .
�,
m 1. - ,
,
. .. -
.
,
.
�
.
t- - E" � -,,, a,
1._ #57 STONE DOUBLE WASHED
-.".,% -111
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-_
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_�
.
TRANSITION TO SOLID PVC
PIPE WITHIN 3' OF RISER
EX. 54" RCP
�
2 B10-FILTER #2_
� SW.02 / SCALE: NTS
EX. 54" RCP
a
6" SOLID PVC FISER AND
CLEANOUT WI'IH VENTED
LID, TYP.
- - - - \- 6" PERFORATED SCHEDULE 40 PVC PIPE OR EQUIVALENT WITH CLEANOUTS
EVERY 50- (MIN), TYP.
1. 3/8" PERFORATIONS @ 6" O.C.
2. PLACE TWIDE STRIP OF FILTER FABRIC AT BOTTOM OF PEA GRAVEL
OVER UNDERDRAIN, TYP.
3. SEE PLAN VIEW,
4. SUB -SOIL TESTING, ONE PER 1,000 SF OF FILTER SURFACE, REQUIRED
TO REMOVE UNDERDRAINS.
VDOT STD. DI-1
RAMP GROUND TO
RISER CREST
r=4�z -�,sue_-_In�1--�---M�ll-A-Z�:�,y�--L .&lrl._-�-1-` l-RIV�,-�-,--
TRANSITION TO SOLID PVC
PIPE WITHIN 3' OF RISER
EX. 54" RCP
.
(7B10-FILTER #1_
SW.02 SCALE: NTS
11�
SEE LANDSCAPE PLAN FOR PLANTING SCHEDULE
PLANTING TEMPLATE TO INCLUDE TURF, HERBACEOUS
VEGETATION, SHRUBS, AND/OR TREES TO ACHIEVE
SURFACE AREA COVERAGE OF AT LEAST 90% WITHIN 2
YEARS. IF USING TURF, MUST COMBINE WITH OTHER TYPES
OF VEGETATION.
_-I _.
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,
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a.
.
I � � .I �
I � .
.�
I
.I
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. .24" BIO-MEDIA MIX . .
(ALLOW FOR SETTLING) .
�,
m 1. - ,
,
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.
,
.
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.
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1._ #57 STONE DOUBLE WASHED
-.".,% -111
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.
TRANSITION TO SOLID PVC
PIPE WITHIN 3' OF RISER
EX. 54" RCP
�
2 B10-FILTER #2_
� SW.02 / SCALE: NTS
EX. 54" RCP
a
6" SOLID PVC FISER AND
CLEANOUT WI'IH VENTED
LID, TYP.
- - - - \- 6" PERFORATED SCHEDULE 40 PVC PIPE OR EQUIVALENT WITH CLEANOUTS
EVERY 50- (MIN), TYP.
1. 3/8" PERFORATIONS @ 6" O.C.
2. PLACE TWIDE STRIP OF FILTER FABRIC AT BOTTOM OF PEA GRAVEL
OVER UNDERDRAIN, TYP.
3. SEE PLAN VIEW,
4. SUB -SOIL TESTING, ONE PER 1,000 SF OF FILTER SURFACE, REQUIRED
TO REMOVE UNDERDRAINS.
VDOT STD. DI-1
RIM 413.50
INV. IN 409.75 (6")
INV, OUT 409.50 (15")
SEE LANDSCAPE PLAN FOR PLANTING SCHEDULE
PLANTING TEMPLATE TO INCLUDE TURF,
RAMP GROUND TO HERBACEOUS VEGETATION, SHRUBS, AND/OR
RISER CREST TREES TO ACHIEVE SURFACE AREA COVERAGE
OF AT LEAST 90% WITHIN 2 YEARS. IF USING TURF,
MUST COMBINE WITH OTHER TYPES OF
-
-- 1�7io__ 11 3-57-
y R 5 T_Q RILA -a EY .-- VEGETATION.
_ _ _ __S;7 -Y ,� - 413-d 1- -
2 3=3t_ _EL�V
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-
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I I BOTTOM ELEV. 413.00
- -.-. -�,-
---\-I'��
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� . - I . I I . .
: - : . I I � . I . . � � . I.. . . I I I .. �.: 24" BIO-MEDIA MIX , '... . . . . . � .. ... 1, 1. I ,
I I I... . I 1, .1. I . � I . I 1, .. � .."'.. I � � . � . -
.
. . I .
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I . 1� I
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.1 ., .- .. .
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1 . -PEAGRAVEL, �;" �I� "..�3 '
1< .� .
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1112" #57 STONE DOUBLE WASHE
11�1'��W"NMM
"
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"
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TRANSITION TO SOLID PVC
PIPE WITHIN 3' OF RISER
BIO-MIEDIA MIX SPECIFICATION
a 85% - 88% SAND
0 8% -12% SOIL FINES
0 3% - 5% ORGANIC MATTER IN THE FORM OF
LEAF COMPOST
0 THE VOLUME OF FILTER MEDIA BASED ON
1 1 0% OF THE PLAN VOLUME, TO ACCOUNT FOR
SETTLING OR COMPACTION
N 6" PERFORATED SCHEDULE 40 PVC PIPE OR EQUIVALENT WITH CLEANOUTS
EVERY 50'(MIN), TYP.
1. 3/8" PERFORATIONS @ 6" O.C.
2. PLACE 3' WIDE STRIP OF FILTER FABRIC AT BOTTOM OF PEA GRAVEL
OVER UNDERDRAIN, TYP.
3. SEE PLAN VIEW.
4. SUB -SOIL TESTING, ONE PER 1,000 SF OF FILTER SURFACE, REQUIRED
TO REMOVE UNDERDRAINS.
(TDRY SWALE
k--SW.02 J SCALE: NTS
6" SOLID PVC RISER AND
CLEANOUT WITH VENTED
LID, TYP.
StormRaXTin
ROUND SERIES TRASH RACK
VARIOUS RISER PIPE
(CMP, HDPE, PVC, DIP, RCP)
STANDARD 48 INCH RACK SHOWN
DIMENSIONS IN INCHES
/;/\,I,\/'<-*:�/XN\--�-�",\�/�x\111
X�*-O,/-\" ,<>'
-FINAL
:!X�4/<<"`,K;>�\_,1 \,BACKFBACKFILL
�/
,f ....... �,�
MINI. COVER TO I " _ X �,�,\, � MIN. COVER TO
11 . . I
RIGID PAVEMENT, H I � I ., k<\� /\ FLEXIBLE PAVEMENT, H
, I . �� �',
ii
, X , .
I I ::
. I , , I .
� I 11,
i_ - , 11. " � .
- 'I,'
6" 1
I I,? i lyy . ' ,,�W"- INITIAL
I ..
SPRINGLIKE -��. - - - BACKFILL
,
" I
I
-t
-
I ,4�, I - I- , 11 T n I .., �- HAUNCH
I , I I BEDDING
i:t
�
4" FOR 4"-24" PIPE I , �
�' ,
6" FOR 30"-60" PIPE MIN. TRENCH WIDTH � ---�_ SUITABLE (SEE TABLE) FOUNDATION
NOTES:
RECOMMENDED MINIMUM
TRENCH WIDTHS
PIPE DIAM.MIN,
TRENCH WIDTH
4"
21 "
6"
23"
81,
26"
10"
28"
12"
301,
15 11
34 11
18"
39"
24"
48"
30"
56"
,35"
64"
42"
72 11
48"
80"
-
60"
96"
-
1. ALL PIPE SYSTEMS SHALL BE INSTALLED IN ACCORDANCE WITH ASTM D2321, "STANDARD
PRACTICE FOR
UNDERGROUND INSTALLATION OF THERMOPLASTIC PIPE FOR SEWERS AND OTHER GRAVITY FLOW
APPLICATIONS", LATEST ADDITION
2. MEASURES SHOULD SE TAKEN TO PREVENT MIGRATION OF NATIVE FINES INTO BACKFILL
MATERIAL, WHEN REQUIRED.
3. FOUNDATION: WHERE THE TRENCH BOTTOM IS UNSTABLE, THE CONTRACTOR SHALL
EXCAVATE TO A DEPTH REQUIRED By THE ENGINEER AND REPLACE WITH SUITABLE MATERIAL
AS SPECIFIED BY THE ENGINEER. AS AN M-TERNATIVE AND AT THE DISCRETION OF THE DESIGN
ENGINEER, THE TRENCH BOTTOM MAY BE S-TkWILIZED USING A GEOTEXTILE MATERIAL.
4. BEDDING: SUITABLE MATERIAL SHALL BE CLASS ,,, 11 OR 111. THE CONTRACTOR SHALL
PROVIDE DOCUMENTATION FOR MATERIAL SPECIFICATION _'A ENGINEER. UNLESS OTHERWISE
NOTED BY THE ENGINEER, MINIMUM BEDDING THICKNESS Shm-i - BE 4" (100mm) FOR 4"-24"
(100)mm-600mm); 6" (150mm) FOR 30"-60" (750mrn-900mr"�,
5. JiNITIAL BACKFILL: SUITABLE MATERIAL SHALL BE CLASS 1, 11 OR III IN THE PIPE ZONE
EXTENDING NOT LESS THAN 6" ABOVE CROWN OF PIPE. THE CONTRACTOR SHALL PROVIDE
DOCWMENTATION FOR MATERIAL SPECIFICATION TO ENGINEER. MATERIAL SHALL BF INSTALLED
AS FREQUIRED IN ASTM D2321, LATEST EDITION.
6. MIINIMUM COVER: MINIMUM COVER, H, IN NON -TRAFFIC APPLICATIONS (GRASS OR
LAND)SCAPE AREAS) IS 12" FROM THE TOP OF PIPE TO GROUND SURFACE. ADDITIONAL
COVER MAY BE REQUIRED TO PREVENT FLOATION. FOR TRAFFIC APPLICATIONS, MINIMUM
COVER, H, IS 12" UP TO 48" DIAMETER PIPE AND 24" OF COVER FOR 54"-60" DIAMETER
PIPE,, MEASURED FROM TOP OF PIPE TO BOTTOM OF FLEXIBLE PAVEMENT OR TO TOP OF
RIGID PAVEMENT.
Z
PIPE BEDDING
C2.01 I SCALE: NTS
HDPE STRUCTURAL PLASTIC BY
PLASTIC SOLUTIONS, IONS, INC.
-
----------- CROSS BRACE LOCATION
11 (REQUIRED TOP OF RISER`
- ---i I - -1 - r,...'�,�. I ri. .."
,
1%
11 �;.�::atiy »\\:�E\3=: \ /' MOUNTING KIT INCLUDED '
Plastic Solutions, Inc. CUSTOMER
, 110 Box 4386, Winchester, VA 22604
1'�11� � 238 JVIcGhee Rd, Winchester, VA 22603
111(877) 877-5727 phone PROJECT:
(540) 722-2219 fax
http;//www.plastic-solution.corn
,
ISOMETRIC
RISER PIPE STRUCTURE DIMENSIONS
----- -1 --- - ------ - -- - -- I --------- I - - ---- ----- ------ - - - - ----- --- - --- � - --- --- ---
!
:
INSIDE STRUCTURE DIMENSION �
�
---- -- ____ __ ------------------- - ----- - ------------------------------
OUTSIDE STRUCTURE DIMENSION �
AVAILABLE OPTION
HDPE ANTI -VORTEX PLATE
_ - __ - -- - ------------------ ----------------------------- - �
DATE:
11
DRAWN BY:
APP'D BY:
__ ------ -
DETAIL:
""-,-te "I -iI a. ._.."., .....,._ ..... . I-_...,.--..,.,
_....,.. ..e....c i1"f11.
�
I...,:0Voe-sl-- .11......,1 ...11............11,.....-..............1-. 1.. .1�1.-..1 1, -
'
Filter Media to contain:
Filter Media
0 85%-88% sand
The volume of filter media based on 1 1 0%
Composition
* 8%-12% soil fines
of the plan volume, to account for settling
* 3%-5% organic matter in the form
or compaction.
of leaf compost
P-Index range = 10-30, OR
Filter Media
Between 7 and 21 mg/kg of P in the
The media must be procured from
Testing
soil media.
approved filter media vendors.
CECs greater than 10
Mulch Layer
Use aged, shredded hardwood bark
-
Lay a 2 to 3 inch layer on the surface of the
mulch
filter bed.
Alternative
Use river stone or pea gravel, coir and
Lay a 2 to 3 inch layer of to suppress weed
Surface Cover
jute matting, or turf cover.
growth.
-
sandyLoamy sand or loam texture,
Top Soil
with less than 5% clay content, pH
3 inch surface depth.
For Turf Cover
corrected to between 6 and 7, and an
organic matter content of at least 2%.
Use a non -woven geotextile fabric with
Apply only to the sides and above the
Geotextile/Liner
a flow rate of > 110 gal./min./sq. ft.
underdrain. For hotspots and certain karst
(e.g., Geotex 351 or equivalent)
sites only, use an appropriate liner on
bottom.
Choking Layer
Lay a 2 to 4 inch layer of sand over a 2 inch layer of choker stone (typically #8 or
#89 washed gravel), which is laid over the underdrain stone,
Stone Jacket for
Underdrain
1 inch stone should be double -washed
12 inches for the underdrain;
and/or Storage
and clean and free of all fines (e.g.,
12 to 18 inches for the stone storage layer,
Layer
VDOT #57 stone).
if needed
-
Use 6 inch rigid schedule 40 PVC pipe
Lay the perforated pipe under the -length of
Underdrains,
(or equivalent corrugated HDPE for
the bioretention cell, and install non-
Cleanouts, and
1111GIO-bioretention), with 3/8-inch
perforated pipe as needed to connect with
Observation i
perforations at 6 inches on center;
the storm drain system. Install T's and Y's
Wells
position each underdrain on a 1% or
as needed, depending on the underdrain
2% slope located nor more than 20
configuration. Extend cleanout pipes to the
feet from the next pipe,
surface with vented caps at the Ts and Ys.
Establish plant materials as specified in the
Plant one tree per 250 square feet (15
landscaping plan and the recommended
feet on -center, minimum 1 inch
plant list.
caliper).
In general, plant spacing must be sufficient
Shrubs a minimum of 30 inches high
to ensure the plant material achieves 80%
planted a minimum of 10 feet on-
cover in the proposed planting areas within
Plant Materials
center.
a 3-year period.
Plant ground cover plugs at 12 to 18
If seed mixes are used, they should be
inches on -center; Plant container-
from a qualified supplier, should be
grown plants at 18 to 24 inches on-
appropriate for stormwater basin
center, depending on the initial plant
applications, and should consist of native
size and how large it will grow,
species (unless the seeding is to establish
-
maintained turf).
Tahip 1111.4 f7rv.qwah3 M;4toprh-41 .1inPi-ifh-nfinncz
M,10."W..be-6 18I -, 11
, bcifl1i -t,I o
, _ - II I
�I I
N ,,b, 6 " , . .
Filter Media to contain:
The volume of filter media is based
Filter Media
0 85-88% sand
on I I 0% of the product of the
Composition
0 8-12% soil fines
surface area and the media depth, to
* 3-5% organic matter in form of
account for settling.
-
leaf compost
'
P-Index range = 10-30; Cation Exchange Capacity (CEC) greater than 10.
Filter Media Testing
Mix on -site or procure from an approved media vendor (refer to Stormwater
Design Spec No. 9: Bioretention, for additional soil media information.
Surface Cover
Turf or river stone.
Top Soil
4 inch surface depth of loamy sand or sandy loam texture, with less than 56/o-
clay content, a corrected pH of 6 to 7, and at least 2% organic matter.
A non -woven polyprene geotextile with a flow rate of > 110 gal./min./sq. ft,
Filter Fabric
(e.g., Geotex 351 or equivalent); Apply immediately above the underdrain
only.], For hotspots and certain karst sites only, use an appropriate liner on
the bottom.
Choking Layer
A 2 to 4 inch layer of sand over a 2 inch layer of choker stone (typically _#8 or
# 89 washed gravel) laid above the underdrain stone.
Stone and/or Storage
A 9 to 18 inch layer (depending on the desired depth of the storage layer) of
Layer
# 57 stone should be double -washed and clean and free of all soil and fines.
6-inch rigid schedule 40 PVC pipe,
Install perforated pipe for the full
Underdrains,
with 3/8-inch perforations.
length of the Dry Swale cell.
Cleanouts, and
Use non -perforated pipe, as needed,
Observation Wells
Use Corrugated HDPE for Rain
to connect with the storm drain
Gardens.
system.
Vegetation
...
Plant species as as specified on the landscaping plan
-
Use non -erosive material such as wood, gabions, riprap, or concrete. All
check dams should be underlain with filter fabric, and i• nclude weep holes.
Check Dams
Wood used for check dams should consist of pressure -treated logs or
timbers, or water-resiistant tree species such as cedar, hemlock, swamp oak
or locust.
Where flow velocities dictate, use woven biodegradable erosion control -
Erosion Control Fabric
fabric or mats (EC2) that are durable enough to last at least 2 growing
-
seasons.
It is highly recommended that a spring maintenance inspection and cleanup be conducted at each
I
bioretention area. The following is a list of some of the key maintenance problems to look for:
* Check o see if 75% to 90% cover (' mulch plus vegetative cover) has been achieved in the
bed, and measure the depth of the remaining mulch.
* Check libr sediment buildup at curb cuts, gravel diaphragms or pavement edges that prevents
flow from getting into the bed, and check for other signs of bypassing.
0 Check for any winter- or salt -killed vegetation, and replace it with hardier species.
* Note presence of accumulated sand, sediment and trash in the pre-treatment cell or filter
beds,
and rernk-,-,,e it,
* Inspect bioretention side slopes and grass filter strips for evidence of any rill or gully erosion,
and lepair it.
0 Check khe bioretention bed for evidence of mulch flotation, excessive ponding, dead plants or
'
concentrated flows, and take appropriate iremed'al action.
0 Check inflow points for clogging, and rernove any sediment.
* Look for any bare soil or sediment sources in the contributing drainage area, arid stabilize
them immediately.
C, 4n
0 Check for clogged or slow -draining soil miedia, a crust formed on the top layer, inappropriate
soil media, or other causes of insufficient filtering time, and restore proper filtration
characteristics.
I
. ..
p �
V_ � .
; .a n d's c a. p -_ a � C li �,,� -_ c t u le I rV I
_ I I till �,Y:, I r 1 e !,-` r i r1 g
- i,? I 'r '11 7- _�fle' . t
- I : ;
, jEMairiS';ee� Az ' Clladl�� ,',,; i 1: C. `,,� 22902
I _ [ I -
eINLTH
Op'�11N�,,
�, 7
Alan G. Franklin
11:� P4
�O Lie. No. 35326 rP
'O 'W ,
1� S�OIVAL �J�
professional seal
ALAN FRANKLIN, PE
project manager
JESSE CALDER
project team
Suggested Annual Maintenance Activities for Bioretention and Dry Swale
REGION TEN
WOMEN'S SHELTER
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* Mowing of grass filter strips and Bioretention tuirf cover
< 4 times a year
project name
* Spot erosion repair, trash
weeding, removal, __ mulch raking
Twice during growing season
REGION 10 COMMUNITY
s Add reinforcement planting to maintain dezired the vegetation
density
* Remove invasive plants using recommended control methods
As needed
SERVICES BD, INC.
o Stabilize the contributing drainage area to prevernc,rosion
client
502 OLD LYNCHBURG ROAD
e Spring inspection and cleanup
* Supplement mulch to maintain a 3 inch layer
e Prune trees and shrubs
Annually
CHARLOTTESVILLE, VIRGINIA 22903
project address
* Remove sediment in pre-treatment cells and inflow points -
Once every 2 to 3 years
I * Replace the mulch layer
I Every 3
- years
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Land that will remain undisturbed OR that will be restored to a hydrologically func , tlu'qlstate:::
project number
& Portions of residential yards that will NOT be disturbed during construction
* Portions of roadway rights -of -way that, following construction, will be used as filter strips, �,,,ss
channels, or stormwater treatment areas; MUST include soil restoration or placement of engineered
COUNTY VSMP SET
soil mix as per the design specifications
9 Community open space areas that will not be mowed routinely, but left in a natural vegetated state
project phase
(can include areas that will be bush hogged nomore than four times per year)
* Utility rights -of -way that will be left in a natural vegetated state (can include areas that will be bush
hogged no more than four times per year)
SEPTEMBER 19, 2016
9 Surface area of stormwater BMPs that are NOT wet ponds, have some type of vegetative cover, and
issue date
that do not replace an otherwise impervious surface. BMPs in this category include bioretention, dry
Swale, grass channel, ED pond that is not mowed routinely. stormwater wetland, soil amended areas
that are vegetated, and infiltration practices that have a vegetated cover.
• Other areas of existin forest and/or o ens ace th '
at will be rotected durin construction and that w'
remain undisturbed. These include wetlands.
Operational & Management Conditions for Land Cover in Forest & Open Space Category:
a Undisturbed portions of yards, community open space, and other areas that will be considered as
forest/open space must be shown outside the LOD on approved E&S plans AND demarcated in the
field (e.g., fencing) prior to commencement of construction.
* Portions of roadway rights -of -way that will count as forest/open space are assumed to be disturbed
1 12/07/16 CO. COMMENTS
during construction, and must follow the most recent design specifications for soil restoration and, if
applicable, site reforestation, as well as other relevant specifications if the area will be used as a filter
revisions
strip, grass channel, bioretention, or other BMP
* All areas that will be considered forest/open space for stormwater purposes must have documentation
that prescribes that the area will remain in a natural, vegetated state. Appropriate documentation
includes: subdivision covenants and restrictions, deeded operation and maintenance agreements and
plans, parcel of common ownership with maintenance plan, third -party protective easement, within
STORMWATER
public right-of-way or easement with maintenance plan, or other documentation approved by the local
program authority
MANAGEMENT
* While the goal is to have forest/open space areas remain undisturbed, some activities may be
prescribed in the appropriate documentation, as approved by the local program authority: forest
management, control of invasive species, replanting and revegetation, passive recreation (e.g., trails),
DETAILS
limited bush hogging to maintain desired vegetative community, etc.
sheet title
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SH ASH RACK 1 %
V_S_W_._02_J SCALE : NTS -
6 BMP SPECS & MAINTENANCE REQUIREMENTS
SW.02 SCALE: NTS I
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1 sheet number