HomeMy WebLinkAboutWPO202100012 Plan - E&S 2021-03-15m
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SHEET INDEX
7MP41-9F \ PRE -CONSTRUCTION CONDITIONS
EROSION & SEDIMENT CONTROL PLAN
M/LEER, DAV/L�R , / / I 'Ac,\ TMP41-9C I \ EROSION & SEDIMENT CONTROL DETAILS
/ \ CARTER, W/LLIAMLEE& \ STORMWATER RUNOFF CALCULATIONS
CARRIE CARTER I \
BEAVER 04s Qa�r�, / \ 1 APPROVED
CREEK C'd.0 T C-41 / \
RESERVOIR / by the Albemarle County
Ceeekr / 1 1 Community Development DeRartment
Park Do. — '03/1512G2_1
�SO�SD�V\/DE, �p 1 I I\ \ 'File WP0202100012
I / / /\1 /
Three NO[Ch'D Rd SOILS
/ 1 � � / d�
/ dC
GROUP802 �
\ / da I DRAINAGE DIVIDE, TYPS / \ '
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/ P
/ T P41-9H
/ __-CAA ELL, CLEVELAND C
\ & FERN G. CAMPBELL
/ .
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752 a_ \ GROUP SOILS / TMP 41-9C1
\ \\
LICKING14OLE Lelu.� .ate 81B TERHAAR,KEVIN& \ \�� `_—_—_� ��/ / •` —\\J� 1
\ SUSAN D MART/N
TMGROUP/
P41-9F /y SOILS \ — —
/ 1 / MILDER, DAVID R 1 �O \ \ BI \ \ \
CUL VNGERT /
UL
— / I
\ SOILS % / 1 \ �O \ \ — — —i-� \ CONCENTRATION PATH / m
\ GROUP / \ — — — SO/LS
SHEET 1
SHEET 2
SHEET 3
SHEET 4
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i< • I I O�I / \ — — l // . / — I — TMP41-16
PRE/POST DRAINAGE /
/ I I / I / WETAREA I I / / / PATTERSON,
\ � I ANALYSIS POINT / �c TMP41-9B2 / ° TMP41-9B4 CAROLYND I / //
\ D.A. = 8.33 Ac / \
\ / --- \ \ BROWNS GAP FARM LLC / COL VIN, STEPHEN C & /
\ (SEE SHEET 2) / / / / — — �— 5.670ACRES CATHERINEP COL VIN
D.B. 52091597
/ l I EXIST/NG
\ / I CUL VERT
TIME OF
• / / / � — — � \ / CONCENTRATION PATH
TMP 41-9F p SOILS
MILLER, DAVID R 9 GROUP
SOIL.5 DA — DA 816DA — DA DA
GROUP SO/LSD/VIDE,
TYP. O
/ q
v\ � -- /
DRAINAGE DIVIDE, TYP.
TMP 41-9A2 / I
MCQUADE, JOHN JOSEPH /
TMP 41-9A 1 / , &SHE/LA MARY MCQUADE /
SOILS
\ I' • I \ \ I I \ \ / I Oq / JEHAI YWOOD MAS
GROUP — —
/ \
7B %� Oq SOILS /
\II G BOB P
\�..—. Oq � /
�I \ � \\ \lip / l /•\ // q� � I i
J
/ / %•// /// / / JOKES M/LL RD PU DA
TMP 41-10EI SOILS INFO.
HIS LAN PARTNERH/P SOILS GROUP 7B BRADDOCK LOAM, 2 TO 7% SLOPES
\ SOILS GROUP 14B CHESTER LOAM, 2 TO 7% SLOPES
LLLP SOILS GROUP 14C CHESTER LOAM, 7 TO 15% SLOPES ORT 0 25' 50' 100,
SOILS GROUP 81C THURMONT LOAM 7 TO 15% SLOPES
SOILS GROUP 96B DELILA LOAM, 2 T6 7% SLOPES \ \
�w RE/POST DRAINAGE
ANALYSIS POINT / \ \
D.A. = 14.33 Ac \ / l WETA�E/
(SEE SHEET 2) / /' / \ II
TMP 41-9B3
(�H/TWOANNERZANNE / I
Sco
SOILS h = 1
I / GROUP
DA �\ O A I /
TMP41-9G r / / / / / ON / / \ 81B r
DAV/S, ROBERT G I Oq / \ \ O r I I m
/
TRUSTEE, ROBERT G \// I i / n� \ Oq / DRAINAGE DIVIDe, TYP. / / DP / \ q / — — —
DAVIS REVOC TRUST & DA DA A I — — DA — DA — DA — DA DPc
\ — — -DA
BARBARA DAV/S TRUSTEE \ I I — — — r— O D
/ \ 9
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►Ian Franklin PE, LLC
Civil and Site Plan Engineering
427 Cranberry Lane Crozet, VA 22932
434-531-5544
alan@alanfranklinpe.com
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Alan G. Franklin
Lic. No. 35326 w
03-11-21 =
ASS/ONAL
ISSUED: 02-26-2021
SCALE: 1" = 50'
REVISIONS:
1. 3-11-21 - RESPONSE TO REVIEW
SHEET
OF 4
E&SC MEASURES
OCE CONSTRUCTION ENTRANCE E&SC STD. 3.02
MILLMP ER, DAV/dR 1 / / I a0 \ \ TMP4119C I \ SF SILT FENCE E&SC STD. 3.06
CARTER, W/L lAM LEE & \
CARR/ECfIRTER I \ TO TOPSOILING E&SC STD.3.30
TEMPORARY SEEDING E&SC STD. 3.31
l o /
PERMANENT SEEDING E&SC STD. 3.32
\♦ \ / \ \ \ \ / / I / / / ` \ \ \ / / S� SOD E&SC STD. 3.33
/� ♦ / / / / / D / \ / - - - - MULCHING E&SC STD. 3.35
�,
/' I / \ ♦ \� ♦ // I \\ \\\ _ J / / I / SOILSD�VIDE,
/I I / ♦ F� �\ \ \ TYP. I
\,40 TMP41-9c1
d0 / TERHAAR, KEN& I 1 SOILS /
\ 1 11 \'40 / \ \ SUSANDMA TIN \ l^ (\ II GROUP j
\ \ l 1 \ I \ I \ DRAINAGE DIVIDE, TYP.
EXISTING SWALE HAS DRAINAGE AREA TO �\ /
"CLEANWATER" DIVERSION _
BEEN LINED WITH FILTER \ \ 2 \
(5.10 ACRES) \ \ \ - - - - - �l
FABRIC & RIVERSTONE
SOILSs� RIP RAP
-- ' \- \ - / a0 \ B�BP \ APPROXIMATE LIM / #57 STONE DRY WELL #2 FOR / _
\ \ \ � l / 1 SOILS \ OF DISTURBANCE GARAGE DOWNSPOUTS
TMP 41-9F / I \ (4 ACRES) W/ 4" OVERFLOW TO SWALE -
\ \ \ EX/STING / 1 / M)4ER, DAVID R 1 �O GROUP \ / (9' X 9' X 4')-
\ CULVERT / CD \ "CLEANWATER" -
\\ J DIVERSION FRENCH DRAIN
ROCK CHECK DAYLIGHTS TO SWALE
\ PRE/POST DRAINAGE SOILS % \ �� DAM #1 \ �__�-� - - TIM OF / \
ANALYSIS \ GROUP 1 - - - - 0 �/ CONCENTRATION PATH m
\ \ / (D.A. = 9.23 AC J \ _ - /0 SOILS I -
D.A. = 14.33 Ac \ 14C / I - - - ���� I FRENCH DRAIN W/ #57 / \ / ♦� _ = -
% Time of Conc. Tc = 18.8 Min /7 \ �O I GRAVEL AND UNDERDRAIN GROUP I Al I _
/ (same for Pre & Post) \ - I _ ttT-- 70 � - - / Z7 l- - a T- - - - I / \ 96B / '
CN(PRE)=64* \ 0 sr - /
/ s /
/ CN(PosT)= 64* / \� /• \ 57� � I � \ 1 / \ i /
*Adjusted for Unconnected / / / �� ss� S l�0 PSI MU I 114,
/ Impervious Areas \ \
/ QPm(,-yr,24Hr) = 5.55 CFS / / /( S / \ F/ \ I WETAR
Rv1(Pra) = 20,958 CF /
QPm(to-yr, 24Hr) = 30.26 CFS / / / \ SF igF-
QPost(1-yr,24Hr) =5.55 CFS \ / / __SF
SF/ SOD.. : ' ��' Y \CONSTRUCTION I
/ �SF� / v' `ENTRANCE CE \ CHITWOOD, SU2ANNE
Rv1(Post) = 20,958 CF �S��SF SF \
QPost(10-yr,24 Hr) = 30.26 CFS 'S.O' .. ' 1
I T.O.' f I TANNER SOILS N
/ TMP41-9H I SILT F NCE / /�::. GARAGE ...� \ I GROUP /
7 / /w ° I
AMPBELL, CLEVE LAND C I I / LIMITS OF / / / \\ q \ 81B
�` TMP41-9G / I SF /.. \ 1 1 ACRE LIMITS WHERE
&FERNG. CAMPBELL I I / GRADING %^ / � \
DAV/S, ROBERT G I °q f BARN \' �RADING HAS OCCURRED I C
\ TRUSTEE, ROBERT G \ / I I / \ ° DRAINAGE DIVIDe, TYP. �� HOUSE f .� ;\ \ (NO GRADING OPERATXONS -
\ DAV/SREVOC TRUST& I CD 11 / FFE 64 HAVE OCCURRED OUTSIDE _ _
cn �` DA �DA A DA DA DA - A'. _ OF THI Z - -0A
\ BARBARA DAV/S TRUSTEE \ I � ,(� � ' . " ' ! '. /•� \ � � �� � D+4
I I ROCK CHECK SILT FENC r. S.V 09 D
\ I DAM #2 TS'.. , DA DA
PRE/POST DRAINAGE I \(D.A. = 2.33 AC.) SF EXISTING 80D :::," SO() ' DA � DA
ANALYSIS I / SILT FENC
..
\ I I \ /
D.A. = 8.33 Ac \ .. TO.
Time of Conc. (Tc) = 15.3 Min - -
/ - -
(same for Pre & Post) / / AREAS DENUDED TO REMOVE INVASIVE TAREA
VAR 6� '
\ CN(PRE)= 62* / \ \ GROUND CO TO BE RE -SEEDED AND 6v /', WE
a
\ CN(PosT)=62* / S,F_ COVERED WITH-ST.1,2AW FOR PASTURE \ I' ''. ! / / I \ / TMP41-9B4
* \ / - NSF a /` ' ROOF DRAINS TIED \ / I COLV/N, STEPHENC&
Adjusted for Unconnected / - SF
Impervious Areas EX/STING / SF SF F:__SF SF� INTO UN ERDRAIN / - _ I / I
P SF tSF - CA THERINE P COL VIN /
/ QPre(1-N.24 Hr)= 2.$2 CFS \ CULVERT l l /5F SF�`SF�SF \ - -� - _ _ _ _ - - _ Rv7(Pre) = 10,260 17.8 CF / / / �S I\ /
/ QPre(10-yr,24Hr) = 17.$0 CFS I / A f \ / I \ /
QPost(1-yr.24Hr)= 2.82 CFS / / \ ° / ENDYAROF
BOX INSTALLED AT \ FRENCH DRAIN W/ #5 /
\\ / RV1(Post) = 10,260 CF I / // ��° O OF FRENCH DRAIN FOR �/ \ GRAVEL AND UND RDRAIN I TIME OF
QPosl(10-yr,24 Hr) = 17.80 CFS / / //°\� O_ VERFLOW RELIEF SILT FENCE �SF \ / �` O•
CONCENTRATION PATH
- "CLEANWATER"
S\SF� �S DIVERSION DD
TMP41-9F / SOILS �L \ SF
MILLER, DAV/DR 9 GROUP
/� �\ / /-/�O / TMP41-962
\ 0 (BROWNS GAP FARM LLC I
(APPROXIMATE LIMITS SOILS ` DA DA DA DA DA `- lam/
("F DISTURBANCE GROUP \ O #57 STONE DRY WELL #1 5.670ACRES _
�S) 1 f4B I/ TOP. SD/V/DE, 9 W/ 6" UNDERDRAIN AND (3) YARD / D.B. 5209/597-
I/I 4q DRAINS FOR OVERFLOW RELIEF
\\ \ (80'X20'X2') - -
\ \ DRAINAGE DIVIDE, TYP.
: \ "CLDRAEANWATER" AREA
DIVERSION l TMP41-9A2 / I
\ (6.00 ACRES) / MCOUADE, ✓OHN✓OSEPH /
� I I
�I\ \ I I \ • ' SOILS °q TMP 41-9A 1 / I &SHE/LA MARYMCOUADEx /
\ I' • I \ \ I I \ \ �/ GROUP I 01 ✓EHA/YWOOD THO/MAS
7B ° / SOILS / \
GROUP
\4\ \ T
CONSTRUCTION SEQUENCE
1. NOTIFY THE EROSION CONTROL INSPECTOR 48 HOURS PRIOR TO BEGINNING CONSTRUCTION.
2. INSTALL CONSTRUCTION ENTRANCE AT LOCATIONS SHOWN ON PLAN AND CLEARLY DEMARCATE THE
\ LIMITS OF WORK.
I / J 3. INSTALL ALL PERIMETER EROSION CONTROL MEASURES SUCH AS SILT FENCE AND INLET PROTECTION ON EXISTING DRAIN INLETS.
r/ f 4. ESTABLISH LAY -DOWN, CONSTRUCTION PARKING/STAGING, AND MATERIAL STOCKPILE AREAS IN
LOCATION SHOWN ON PLANS.
5. PERFORM ANY DEMOLITION ACTIVITIES REQUIRED TO EXECUTE THE APPROVED EROSION CONTROL
PLAN.
6. STRIP TOPSOIL AND STORE IN STOCKPILE AREA, 8' HEIGHT MAX. DISPOSE OF DEBRIS AND ADDITIONAL - - - \L�l� QA 656DA \ - - 1 DA
SOILS APPROPRIATELY. -
/ DA
7. ESTABLISH NEW SITE GRADES AND STORM DRAIN INFRASTRUCTURE WITH INLET PROTECTION. J JONES MILL RD PU - - - -°
8. APPLY EROSION CONTROL MATTING ON ALL SLOPES GREATER THAN 3:1. _
9. STABILIZE PARKING LOT AREAS, BUILDING PADS, AND SIDEWALK AREAS WITH GRAVEL OR PAVEMENT / / f - J J
AND ESTABLISH TURF VEGETATION ON ALL NON -PAVED AREAS THAT HAVE BEEN DISTURBED. _ / TMPI41-10E I SOILS INFO.
10. ONCE PERMANENT VEGETATION IS ESTABLISHED AND UPON APPROVAL OF THE ENGINEER OR / H/ LAND
HIS
SOILS GROUP 7B BRADDOCK LOAM, 2 TO 7% SLOPES
11. LANDSCAPE ARCHITECT, SCHEDULE A FINAL INSPECTION BY THE COUNTY EROSION CONTROL OFFICER. PARTNONCE SITE IS DEEMED STABILIZED BY THE COUNTY EROSION CONTROL INSPECTOR AND ALL SOILS GROUP 14B CHESTER LOAM, 2 TO 7% SLOPES ORT 0 25' 50'
CONSTRUCTION ACTIVITIES ARE COMPLETED, RESTORE STAGING AND ACCESS AREAS TO ACCEPTABLE SOILS GROUP 14C CHESTER LOAM, 7 TO 15% SLOPES / SOILS GROUP 81C THURMONT LOAM 7 TO 15% SLOPES
(PRE -CONSTRUCTION) CONDITIONS AND REMOVE ALL EROSION CONTROL MEASURES. / I SOILS GROUP 96B DELILA LOAM, 2 T6 7% SLOPES
100,
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TMP 41} 16
PATTERSION,
CAROL Y/ D
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Alan Franklin PE, LLC
Civil and Site Plan Engineering
427 Cranberry Lane Crozet, VA 22932
434-531-5544
alan@alanfranklinpe.com
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Alan G. Franklin
Lic. No. 35326 w
03-11-21 =
ISSUED: 02-26-2021
SCALE: 1" = 50'
REVISIONS:
1. 3-11-21 - RESPONSE TO REVIEW
SHEET
STONE 70' MIN.
CONSTRUCTION
ACCESS //�- 3" SM-2A ASPHALT TOP
/ COURSE
2% f 29,
STONE
CONSTRUCTION
ACCESS
`6" M:N. 21A AGGREGATE BASE
PROFILE
70'
2%
�2%
ASPHALT PAVED
WASHRACK
1 2%
12' MIN.* ~-
I
*MUST EXTEND FULL WIDTH `--Q t POSITIVE DRAINAGE
I TO SEDIMENT
OF INGRESS AND EGRESS + OPERATION TRAPPING DEVICE
PLAN
2'
EXISTING
PAVEMENT
EXISTING
PAVEMENT--'
SITIVE DRAINAGE
SEDIMENT
4PPING DEVICE
FILTER CLOTH)
SECTION A -A
A mninvnmunn water tap of 1 inch must be installed with a ntavtmun 1 inch ballcock
shutoff valve supplying a wash hose with a diameter of 1.5 itches for adequate
constant pressure. Wash water must be caned away from the entrance to an
approved settlitng area to remove sediment. All sediment shall be prevented from
entering stonn drains, ditches or watercourses.
PAVED WASH RACK
NO SCALL
ALBEMARLE COUNTY CONSTRUCTION ENTRANCE
SECTION
SOURCE: VA. DSWC
FILTI
CLASS 1 RIP RAP
FLOW
VDOT#1
COARSE AGGF
FLOW
10,
ROCK CHECK DAM #1
(DOWNSTREAM VIEW)
?'7
CLASS I RIPRAP
ROCK CHECK DAM #2
15
(DOWNSTREAM VIEW)
CLASS I RIPRAP
3'
E-001
N.T.S.
PLATE. 3.20-1
SOURCE: Adapted from Installation of Straw and Fabric Filter Barriers for Sediment Control,VA. DSWC PLATE. 3.05-2
Sherwood and Wyant
1. SET THE STAKES. 2. EXCAVATE A 4"X 4" TRENCH
UPSLOPE ALONG THE LINE OF
STAKES.
J
FLO��
3. STAPLE FILTER MATERIAL
TO STAKES AND EXTEND
IT INTO THE TRENCH.
55Y
4. BACKFILL AND COMPACT
THE EXCAVATED SOIL.
FLOW
SHEET FLOW INSTALLATION
(PERSPECTIVE VIEW)
POINTS A SHOULD BE HIGHER THAN POINT B.
DRAINAGEWAY INSTALLATION
(FRONT ELEVATION)
CONSTRUCTION OF A SILT FENCE
(WITHOUT WIRE SUPPORT)
DETAIL
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
TEMPORARY SEEDING
SPECIFICATION
SOURCE: VA. DSWC
Soil
E-028
N.T.S.
ID-000
N.T.S.
PLATE 3.09-1
18" min. Line Uphill Toe with 6' Wide EC-2 Erosion Control Matting
Stabilize Outlet with Rip Rap
-Flow
4.5' min.
TEMPORARY DIVERSION DIKE
1. UNLESS OTHERWISE INDICATED, ALL VEGETATIVE AND STRUCTURAL EROSION AND SEDIMENT CONTROL PRACTICES
WILL BE CONSTRUCTED AND MAINTAINED ACCORDING TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE
VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK AND VIRGINIA REGULATIONS VR 625-02-00 EROSION AND
SEDIMENT CONTROL REGULATIONS.
2. THE PLAN APPROVING AUTHORITY MUST BE NOTIFIED ONE WEEK PRIOR TO THE PRE -CONSTRUCTION CONFERENCE,
ONE WEEK PRIOR TO THE COMMENCEMENT OF LAND DISTURBING ACTIVITY, AND ONE WEEK PRIOR TO THE FINAL
INSPECTION.
3. ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR TO OR AS THE FIRST STEP IN
CONSTRUCTION.
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 SHALL 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, 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 OF SLIDES, SINKING, OR COLLAPSE.
13. 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 RYEGRASS AND CEREAL WINTER
RYE, OR IN MARCH AND APRIL TO CONSIST OF ANNUAL RYE, OR MAY THROUGH AUGUST TO CONSIST OF GERMAN
MILLET. STRAW MULCH IS TO BE APPLIED AT 80LBS/10OSF. ALTERNATIVES ARE SUBJECT TO APPROVED BY THE
EROSION CONTROL INSPECTOR.
14. PERMANENT SEEDING, LIME, FERTILIZATION, AND MULCHING IS TO BE APPLIED TO ALL AREAS NOT PROPOSED FOR
HARDSCAPE OR BUILDING IMPROVEMENTS AS SOON AS POSSIBLE. 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 TURF -TALL FESCUE APPLIED AT 200-250
LBS/ACRE, UNLESS OTHERWISE SPECIFIED BY THE ARCHITECT. STRAW MULCH IS TO BE APPLIED AT 80LBS/100SF.
ALTERNATIVES ARE SUBJECT TO APPROVED BY THE EROSION CONTROL INSPECTOR.
15. MAINTENANCE: ALL MEASURES ARE TO BE INSPECTED WEEKLY AND AFTER EACH RAINFALL. ANY DAMAGE OR
CLOGGING TO STRUCTURAL MEASURES IS TO BE REPAIR IMMEDIATELY. SILT TRAPS ARE TO BE CLEANED WHEN 50%
OF THE WET STORAGE VOLUME IS FILLED WITH SEDIMENT. ALL SEEDED AREAS ARE TO BE RESEEDED WHEN
NECESSARY TO ACHIEVE A GOOD STAND OF GRASS. SILT FENCE AND DIVERSION DIKES WHICH ARE COLLECTING
SEDIMENT TO HALF THEIR HEIGHT MUST BE CLEANED AND REPAIRED IMMEDIATELY.
16. 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 EROSION CONTROL
INSPECTOR.
1992 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 lbs.
- Kentucky 31 or Turf -Type Tall Fescue
95-100%
- Improved Perennial Ryegrass
0-5%
- Kentucky Bluegrass
0-5%
High -Maintenance Lawn
200-250 lbs.
Kentucky 31 or Turf -Type Tall Fescue
100%
General Slope (3:1 or less)
- Kentucky 31 Fescue
128 lbs.
- Red Top Grass
2 lbs.
- Seasonal Nurse Crop '
20 lbs.
1501bs.
Low -Maintenance Slope Steeper than 3:1)
- Kentucky 31 Fescue 108 lbs.
- Red Top Grass 2 lbs.
- Seasonal Nurse Crop * 20 lbs.
- Crownvetch ** 20 lbs.
150 lbs.
* Use seasonal nurse crop in accordance with seeding dates as stated below:
February 16th through April ...................... Annual Rye
May 1st through August 15th ..................... Foxtail Millet
August 16th through October ...................... Annual Rye
November through February 15th ................... Winter Rye
" Substitute Sericea lespedeza for Crownvetch east of Farmville, Va. (May
through September use hulled Sericea, all other periods, use unhulled Sericea).
If Flatpea is used in lieu of Crownvetch, increase rate to 30 lbs./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.
III - 303
PERMANENT SEEDING
Alan Franklin PE, LLC
Civil and Site Plan Engineering
427 Cranberry Lane Crozet, VA 22932
434-531-5544
alan@alanfranklinpe.com
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Alan G. Franklin
_0 Lic. No. 35326 w
03-11-21 =
NAL
ISSUED: 02-26-2021
SCALE: AS SHOWN
REVISIONS:
1. 3-11-21 - RESPONSE TO REVIEW
SHEET
SECTION
E-047
N.T.S.
SECTION
E-005
N.T.S.
SPECIFICATION
ID-000
N.T.S.
OF 4
X//
) YARD INLETS @ 25' O.C.
DRY WELL #1
SECTION
DOWNSPOUT
OVERFLOW SOD
4" PVC DRY I
WELL INLET PIPE
#57 STONE WRAPPED IN FILTER FABRIC
2' MIN_ DEPTH
PERFORATED
SPLASH BLOCK PVC PIPE, TYP.
CAP END OF
PIPE, TYP.
12' TO
PERFORATIONS,
TYP.
10, MIN. SETBACK /. /j /i / /, /j
TO FOUNDATION REBAR
ANCHOR
WASHED #57 STEEL FOOT
STONE PLATE
WRAPPED IN
FILTER FABRIC
DRY WELL #2
SECTION
DRAIN W/ 6" PIPE
NTO STONE
INSPECTION
PORT W/CAP
BELOW SOD
N.T.S.
N.T.S.
4" PVC OVERFLOW
TO SWALE
Pre -Development
Barnhouse Type/1 24-hr lyrAlb. Rainfall=3.00"
Prepared by Microsoft Printed 3/11/2021
HydroCAD@ 10.00-20 s/n 02893 @ 2017 HydroCAD Software Solutions LLC Page 1
Summary for Subcatchment 1S: Pre-Dev. North
Runoff = 5.55 cfs @ 12.16 hrs, Volume= 20,958 cf, Depth> 0.40"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yr Alb. Rainfall=3.00"
Area (ac) CN Adi Description
12.350 61 >75% Grass cover, Good, HSG B
0.760 98 Unconnected pavement, HSG B
0.090 98 Unconnected pavement, HSG D
1.130 80 >75% Grass cover, Good, HSG D
14.330 65 64 Weighted Average, UI Adjusted
13.480 94.07% Pervious Area
0.850 5.93% Impervious Area
0.850 100.00% Unconnected
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.6 50 0.0250 1.39 Sheet Flow, Sheet Flow pavement
Smooth surfaces n= 0.011 P2= 3.60"
8.4 100 0.0250 0.20 Sheet Flow, Sheet flow grass
Grass: Short n= 0.150 P2= 3.60"
9.8 1,500 0.0250 2.55 Shallow Concentrated Flow, Shallow Concentrated
Unpaved Kv= 16.1 fps
18.8 1,650 Total
Summary for Subcatchment 2S: Pre-Dev. South
Runoff = 2.82 cfs @ 12.12 hrs, Volume= 10,260 cf, Depth> 0.34"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yrAlb. Rainfall=3.00"
Area (ac) CN Add Description
7.850 61 >75% Grass cover, Good, HSG B
0.480 98 Unconnected pavement, HSG B
8.330 63 62 Weighted Average, UI Adjusted
7.850 94.24% Pervious Area
0.480 5.76% Impervious Area
0.480 100.00% Unconnected
Pre -Development
Barnhouse Type // 24-hr lyrAlb. Rainfall=3.00"
Prepared by Microsoft Printed 3/11/2021
HydroCAD@ 10.00-20 s/n 02893 @ 2017 HydroCAD Software Solutions LLC Page 2
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
0.3
25
0.0350
1.38
Sheet Flow, Sheet Flow pavement
Smooth surfaces n= 0.011 P2= 3.60"
8.8
125
0.0350
0.24
Sheet Flow, Sheet flow grass
Grass: Short n= 0.150 P2= 3.60"
6.2
954
0.0250
2.55
Shallow Concentrated Flow, Shallow Concentrated
Unpaved Kv= 16.1 fos
15.3 1,104 Total
Pre -Development
Barnhouse Type/1 24-hr 10yrAlb. Rainfall=5.50"
Prepared by Microsoft Printed 3/11/2021
HydroCAD@ 10.00-20 s/n 02893 @ 2017 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment 1S: Pre-Dev. North
Runoff = 30.26 cfs @ 12.12 hrs, Volume= 89,617 cf, Depth> 1.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr Alb. Rainfall=5.50"
Area (ac) CN Add Description
12.350 61 >75% Grass cover, Good, HSG B
0.760 98 Unconnected pavement, HSG B
0.090 98 Unconnected pavement, HSG D
1.130 80 >75% Grass cover, Good, HSG D
14.330 65 64 Weighted Average, UI Adjusted
13.480 94.07% Pervious Area
0.850 5.93% Impervious Area
0.850 100.00% Unconnected
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.6 50 0.0250 1.39 Sheet Flow, Sheet Flow pavement
Smooth surfaces n= 0.011 P2= 3.60"
8.4 100 0.0250 0.20 Sheet Flow, Sheet flow grass
Grass: Short n= 0.150 P2= 3.60"
9.8 1,500 0.0250 2.55 Shallow Concentrated Flow, Shallow Concentrated
Unpaved Kv= 16.1 fps
18.8 1,650 Total
Summary for Subcatchment 2S: Pre-Dev. South
Runoff = 17.80 cfs @ 12.09 hrs, Volume= 47,662 cf, Depth> 1.58"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 1 Oyr Alb. Rainfall=5.50"
Area (ac) CN Add Description
7.850 61 >75% Grass cover, Good, HSG B
0.480 98 Unconnected pavement, HSG B
8.330 63 62 Weighted Average, UI Adjusted
7.850 94.24% Pervious Area
0.480 5.76% Impervious Area
0.480 100.00% Unconnected
Pre -Development
Barnhouse
Type 11 24-hr 10yrAlb. Rainfall=5.50"
Prepared by Microsoft
Printed 3/11/2021
HydroCAD@ 10.00-20 s/n 02893
@ 2017 HydroCAD Software Solutions LLC Page 4
Tc Length
Slope
Velocity
Capacity Description
(min) (feet)
(f /ft)
(f 1sec)
(cfs)
0.3 25
0.0350
1.38
Sheet Flow, Sheet Flow pavement
Smooth surfaces n= 0.011 P2= 3.60"
8.8 125
0.0350
0.24
Sheet Flow, Sheet flow grass
Grass: Short n= 0.150 P2= 3.60"
6.2 954
0.0250
2.55
Shallow Concentrated Flow, Shallow Concentrated
Unpaved Kv= 16.1 fps
15.3 1,104
Total
Post -Development
Barnhouse Type 1124-hr lyrAlb. Rainfall=3.00"
Prepared by Microsoft Printed 3/11/2021
HydroCAD@ 10.00-20 s/n 02893 @ 2017 HydroCAD Software Solutions LLC Page 1
Summary for Subcatchment 3S: Post-Dev. North
Runoff = 5.55 cfs @ 12.16 hrs, Volume= 20,958 cf, Depth> 0.40"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yrAlb. Rainfall=3.00"
Area (ac) CN Add Description
12.280 61 >75% Grass cover, Good, HSG B
0.830 98 Unconnected pavement, HSG B
0.090 98 Unconnected pavement, HSG D
1.130 80 >75% Grass cover, Good, HSG D
14.330 65 64 Weighted Average, UI Adjusted
13.410 93.58% Pervious Area
0.920 6.42% Impervious Area
0.920 100.00% Unconnected
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.6 50 0.0250 1.39 Sheet Flow, Sheet Flow pavement
Smooth surfaces n= 0.011 P2= 3.60"
8.4 100 0.0250 0.20 Sheet Flow, Sheet flow grass
Grass: Short n= 0.150 P2= 3.60"
9.8 1,500 0.0250 2.55 Shallow Concentrated Flow, Shallow Concentrated
Unpaved Kv= 16.1 fps
18.8 1,650 Total
Summary for Subcatchment 4S: Post-Dev. South
Runoff = 2.82 cfs @ 12.12 hrs, Volume= 10,260 cf, Depth> 0.34"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 1yrAlb. Rainfall=3.00"
Area (ac) CN Add Description
7.690 61 >75% Grass cover, Good, HSG B
0.640 98 Unconnected pavement, HSG B
8.330 64 62 Weighted Average, UI Adjusted
7.690 92.32% Pervious Area
0.640 7.68% Impervious Area
0.640 100.00% Unconnected
Post -Development
Barnhouse Type 1124-hr lyrAlb. Rainfall=3.00"
Prepared by Microsoft Printed 3/11/2021
HydroCAD@ 10.00-20 s/n 02893 @ 2017 HydroCAD Software Solutions LLC Paae 2
Tc Length Slope Velocity Capacity Description
(min) (feet) (f /ft) (ft/sec) (cfs)
0.3 25 0.0350 1.38 Sheet Flow, Sheet Flow pavement
Smooth surfaces n= 0.011 P2= 3.60"
8.8 125 0.0350 0.24 Sheet Flow, Sheet flow grass
Grass: Short n= 0.150 P2= 3.60"
6.2 954 0.0250 2.55 Shallow Concentrated Flow, Shallow Concentrated
Unpaved Kv= 16.1 fps
15.3 1,104 Total
Post -Development
Barnhouse Type/1 24-hr 10yrAlb. Rainfall=5.50"
Prepared by Microsoft Printed 3/11/2021
HydroCAD@ 10.00-20 s/n 02893 @ 2017 HydroCAD Software Solutions LLC Paoe 3
Summary for Subcatchment 3S: Post-Dev. North
Runoff = 30.26 cfs @ 12.12 hrs, Volume= 89,617 cf, Depth> 1.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr Alb. Rainfall=5.50"
Area (ac) CN Add Description
12.280 61 >75% Grass cover, Good, HSG B
0.830 98 Unconnected pavement, HSG B
0.090 98 Unconnected pavement, HSG D
1.130 80 >75% Grass cover, Good, HSG D
14.330 65 64 Weighted Average, UI Adjusted
13.410 93.58% Pervious Area
0.920 6.42% Impervious Area
0.920 100.00% Unconnected
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.6 50 0.0250 1.39 Sheet Flow, Sheet Flow pavement
Smooth surfaces n= 0.011 P2= 3.60"
8.4 100 0.0250 0.20 Sheet Flow, Sheet flow grass
Grass: Short n= 0.150 P2= 3.60"
9.8 1,500 0.0250 2.55 Shallow Concentrated Flow, Shallow Concentrated
Unpaved Kv= 16.1 fps
18.8 1,650 Total
Summary for Subcatchment 4S: Post-Dev. South
Runoff = 17.80 cfs @ 12.09 hrs, Volume= 47,662 cf, Depth> 1.58"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 10yr Alb. Rainfall=5.50"
Area (ac) CN Add Description
7.690 61 >75% Grass cover, Good, HSG B
0.640 98 Unconnected pavement, HSG B
8.330 64 62 Weighted Average, UI Adjusted
7.690 92.32% Pervious Area
0.640 7.68% Impervious Area
0.640 100.00% Unconnected
Post -Development
Barnhouse Type 1124-hr 10yrAlb. Rainfall=5.50"
Prepared by Microsoft Printed 3/11/2021
HydroCAD@ 10.00-20 s/n 02893 @ 2017 HydroCAD Software Solutions LLC Page 4
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.3 25 0.0350 1.38 Sheet Flow, Sheet Flow pavement
Smooth surfaces n= 0.011 P2= 3.60"
8.8 125 0.0350 0.24 Sheet Flow, Sheet flow grass
Grass: Short n= 0.150 P2= 3.60"
6.2 954 0.0250 2.55 Shallow Concentrated Flow, Shallow Concentrated
Unpaved Kv= 16.1 fps
15.3 1,104 Total
Jan Franklin PE, LL(
Civil and Site Plan Engineering
427 Cranberry Lane Crozet, VA 22932
434-531-5544
alan@alanfranklinpe.com
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Alan G. Franklin
Lic. No. 35326 w
03-11-21 =
�SS'ONAL
ISSUED: 02-26-2021
SCALE: AS SHOWN
REVISIONS:
1. 3-11-21 - RESPONSE TO REVIEW
SHEET
4
OF 4