HomeMy WebLinkAboutWPO201800077 Plan - VSMP 2021-06-03SITE DATA
OWNER / DEVELOPER:
PLAN PREPARER:
TAX MAP PARCEL No:
PARCEL AREA:
ZONING:
USE:
MARCH MOUNTAIN PROPERTIES LLC CONTACT: DAVE BROCKMAN
1005 HEATHERCROFT CIRCLE, SUITE 400 CELL: (702)-985-9088
CROZET, VA 22932 dove@oldtroilvilloge.com
ROUDABUSH, GALE, & ASSOCIATES
172 SOUTH PANTOPS DRIVE, SUITE A
CHARLOTTESVILLE, VA. 22902
(434)-979-8121
�;V�yXiII�71Q�Z�II�I�IHy�
23.27 AC
NEIGHBORHOOD MODEL DISTRICT IN ACCORDANCE WITH PROFFERS
OF ZMA 2015-00001 APPROVED FEBRUARY 1, 2016
ENTRANCE CORRIDOR OVERLAY DISTRICT
STEEP SLOPES (MANAGED & PRESERVED) OVERLAY DISTRICT
92 SINGLE FAMILY LOTS (73 SFD, 19 SFA)
GROSS RESIDENTIAL DENSITY: 3.95 UNITS/AC.
OLD TRAIL VILLAGE
BLOCK 32
STORMWATER MANAGEMENT
& EROSION CONTROL PLAN
MAGISTERIAL DISTRICT: WHITE HALL MAGISTERIAL DISTRICT
STORMWATER MANAGEMENT- AS DEFINED BY THE OVERALL STORMWATER MASTER PLAN (WPO20160009), APPROVED
412512016
WATERSHED: LICKINGHOLE CREEK
TOPOGRAPHY:
LOUISA AERIAL SURVEYS, AUGUST 2012. ROUDABUSH, GALE & ASSOCIATES AUGUST 2018
(ASB)
BENCHMARK.-
INLET TOP ON OLD TRAIL DRIVE = 653.0
DATUM.
VERTICAL - NAVD 88, HORIZONTAL - NAD 83
CRITICAL SLOPES:
CRITICAL SLOPES EXIST WITHIN THE PROJECT LIMITS. GRADING ACTIVITY IS
PLANNED WITH THIS PROJECT IN ACCORDANCE WITH APPROVED ZMA. THE LIMITS OF THE
CRITICAL SLOPES WERE DETERMINED BY THE ANALYSIS OF THE EXISTING
TOPOGRAPHY FROM THE AERIAL SURVEY AND GIS CONTOUR DATA. A PORTION OF
CRITICAL SLOPES HAS BEEN FIELD VERIFIED TO BE LESS THAN 25% AND EXHIBIT HAS
BEEN SUBMITTED UNDER SEPARATE COVER: CRITICAL SLOPE EXHIBIT OLD TRAIL VILLAGE
BLOCK 32, APPROVED 08-30-2018.
FLOODPLAIN:
PORTIONS OF THIS PROJECT ARE LOCATED WITHIN THE FEMA FLOODPLAIN LIMITS AS
SHOWN ON FLOOD INSURANCE RATE MAP COMMUNITY PANEL NUMBER 510006 0237 D.
EFFECTIVE DATE: FEBRUARY 4, 2005.
THERE WILL BE ENTRANCE GRADING OPERATIONS ASSOCIATED WITH THIS PROJECT WITHIN
THE FEMA FLOODPLAIN LIMITS. HEC-RAS STUDY HAS BEEN COMPLETED AND SUBMITTED
TO THE COUNTY ENGINEER FOR DETERMINATION. FLOODPLAIN DEVELOPMENT PERMIT,
FDP201800018, APPROVED 11-06-2018.
LANDSCAPING:
SEE LANDSCAPING PLAN FOR PLANTINGS, SCHEDULE AND SPECIFICATIONS, NOTES AND
DETAILS
NO EVIDENCE OF A BURIAL
SITE WAS FOUND ON THIS PORTION OF PARCEL Al.
THE STREAM BUFFER(S) SHOWN HEREON SHALL BE MANAGED IN ACCORDANCE WITH THE THE ALBEMARLE COUNTY
WATER PROTECTION ORDINANCE.
THIS SITE IS NOT LOCATED
WITHIN AN AGRICULTURAL -FORESTAL DISTRICT.
THIS SITE IS LOCATED WITHIN THE SOUTH FORK RIVANNA RESERVOIR WATERSHED OF A PUBLIC WATER SUPPLY
RESERVOIR.
GENERAL CONSTRUCTION NOTES FOR EROSION
AND SEDIMENT CONTROL PLANS
1. THE PLAN APPROVING AUTHORITY MUST BE NOTIFIED ONE WEEK PRIOR TO THE
PRE -CONSTRUCTION CONFERENCE, ONE WEEK PRIOR TO THE COMMENCEMENT OF
LAND DISTURBING ACTIVITY, AND ONE WEEK PRIOR TO THE FINAL
INSPECTION.
2. ALL EROSION AND SEDIMENT CONTROL MEASURES WILL BE CONSTRUCTED AND
MAINTAINED ACCORDING TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE
VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK AND VIRGINIA REGULATIONS
VR 625-02-00 EROSION AND SEDIMENT CONTROL REGULATIONS.
3. ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR TO
OR AS THE FIRST STEP IN CLEARING.
4. A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL PLAN SHALL BE
MAINTAINED ON THE SITE AT ALL TIMES.
5. PRIOR TO COMMENCING LAND DISTURBING ACTIVITIES IN AREAS OTHER THAN
INDICATED ON THESE PLANS (INCLUDING, BUT NOT LIMITED TO, OFF -SITE
BORROW OR WASTE AREAS),THE CONTRACTOR SHALL SUBMIT A SUPPLEMENTARY
EROSION CONTROL PLAN TO THE OWNER FOR REVIEW AND APPROVAL BY THE
PLAN APPROVING AUTHORITY.
6. THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY ADDITIONAL
EROSION CONTROL MEASURES NECESSARY TO PREVENT EROSION AND
SEDIMENTATION AS DETERMINED BY THE PLAN APPROVING AUTHORITY.
7. ALL DISTURBED AREAS ARE TO DRAIN TO APPROVED SEDIMENT CONTROL
MEASURES AT ALL TIMES DURING LAND DISTURBING ACTIVITIES AND DURING SITE
DEVELOPMENT UNTIL FINAL STABILIZATION IS ACHIEVED.
8. DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN APPROVED
FILTERING DEVICE.
9. THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES
PERIODICALLY AND AFTER EACH RUNOFF PRODUCING RAINFALL EVENT. ANY
NECESSARY REPAIRS OR CLEANUP TO MAINTAIN THE EFFECTIVENESS OF THE
EROSION CONTROL DEVICES SHALL BE MADE IMMEDIATELY.
10. ALL FILL MATERIAL TO BE TAKEN FROM AN APPROVED, DESIGNATED BORROW
AREA.
11. ALL WASTE MATERIALS SHALL BE TAKEN TO AN APPROVED WASTE AREA. EARTH
FILL SHALL BE INERT MATERIALS ONLY, FREE OF ROOTS, STUMPS, WOOD,
RUBBISH, AND OTHER DEBRIS.
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
THAT 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.
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.
hL
WP02018iiiiiiiiiiiI00077
VICINITY MAP SCALE 111=1000 FEET
EROSION & SEDIMENT CONTROL LEGEND
SAF F3011
SAFETY FENCE
CE F3O o CONSTRUCTION ENTRANCE
CONSTRUCTION
C R S 3.03 C R S STABILIZATION ROAD
SF 3.05 v SILT FENCE
F31 DIVERSION
DF31 ST SEDIMENT TRAP
SB 3.14 SB SEDIMENT BASIN
OP 3.18
SR 329 SR
T 3.31 TS
PS 3.32 PS PERMANENT SEEDING
TP 3.38 +P TT TREE PROTECTION
&F3 39 DC DUST CONTROL
TOTAL DISTURBED AREA = 20.80 ACRES
OUTLET PROTECTION
SURFACE ROUGHENING
TEMPORARY SEEDING
APPROVALS DATE
DEPARTMENT OF COMMUNITY DEVELOPMENT
PLANNING / ZONNING
ENGINEERING
SHEET INDEX
SHEET 1----------
COVER SHEET
SHEET 2----------
EXISTING CONDITIONS & SOILS/ESC PHASE 1
SHEET 3----------
EROSION CONTROL PHASE 2
SHEET 4----------
EROSION CONTROL PHASE 2
SHEET 5----------
DRAINAGE MAP TO S-1 FACILITY
SHEET 6----------
DRAINAGE MAP TO S-13 FACILITY
SHEET 7----------
EROSION CONTROL NARRATIVE & DETAILS
SHEET 8----------
EROSION CONTROL NOTES & DETAILS/NYLOPLAST DETAIL FOR SWM
SHEET 9----------
BMP CONVERSION NOTES & DETAILS
SHEET 10---------
BMP CONVERSION NOTES/DETAILS & PROFILE
SHEET 11---------
MITIGATION DETAILS
SHEET 12---------
MITIGATION PLAN
SHEET 13---------
MITIGATION PLAN
SHEET 14---------
LANDSCAPE PLAN & CONSTRUCTION RECORD DRAWING
REQUIREMENTS
GENERAL CONSTRUCTION NOTES FOR EROSION AND
SEDIMENT CONTROL PLANS (CONT.)
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 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 80 LBS/100SF. ALTERNATIVES
ARE SUBJECT TO BE 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 90 LBS/1000SF.
INCORPORATED INTO THE TOP 4-6 INCHES OF SOIL. FERTILIZER SHALL BE APPLIED AT
1000 LBS/ACRE AND CONSIST OF A 10-20-10 NUTRIENT MIX. PERMANENT SEEDING
SHALL BE APPLIED AT 180 LBS/ACRE AND CONSIST OF 95% KENTUCKY 31 OR TALL
FESCUE AND 0-5% PERENNIAL RYEGRASS OR KENTUCKY BLUEGRASS. STRAW MULCH IS
TO BE APPLIED AT 80 LBS/100SF. ALTERNATIVES ARE SUBJECT TO BE 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 DYKES WHICH ARE COLLECTING SEDIMENT TO HALF THEIR HEIGHT MUST BE
CLEANED AND REPAIRED IMMEDIATELY.
20. ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE REMOVED
WITHIN 30 DAYS OF FINAL SITE STABILIZATION, WHEN MEASURES ARE NO LONGER
NEEDED, SUBJECT TO APPROVAL BY THE COUNTY EROSION CONTROL INSPECTOR.
21. THIS PLAN SHALL BE VOID IF THE OWNER DOES NOT OBTAIN A PERMIT WITHIN 1 YEAR
OF THE DATE OF APPROVAL. (WATER PROTECTION ORDINANCE SECTION 17-204G).
22.PERMANENT VEGETATION SHALL BE INSTALLED ON ALL DENUDED AREAS WITHIN NINE (9)
MONTHS AFTER THE DATE THE LAND DISTURBING ACTIVITY COMMENCED. (WATER
PROTECTION ORDINANCE SECTION 17-207B).
23.THESE PLANS DO NOT GUARANTEE THE EXISTENCE, NON-EXISTENCE OR LOCATION OF
UTILITIES. CONTRACTOR SHALL VERIFY THE EXISTENCE AND LOCATION OR THE
NON-EXISTENCE OF UTILITIES. AT LEAST 48 HOURS PRIOR TO ANY EXCAVATION OR
CONSTRUCTION, CONTRACTOR SHALL NOTIFY MISS UTILITY (1-800-552-7001) AND/OR
THE RESPECTIVE UTILITY COMPANIES FOR GAS, WATER, SEWER, POWER, PHONE AND
CABLE. CONTRACTOR SHALL TIMELY ARRANGE TO HAVE THE VARIOUS UTILITIES LOCATED,
AND TO HAVE THEM REMOVED OR RELOCATED, OR TO DETERMINE THE METHOD OF
PROTECTION ACCEPTABLE TO THE RESPECTIVE OWNER, IF THE METHOD OF PROTECTION
IS NOT OTHERWISE SPECIFIED. CONTRACTOR SHALL CONDUCT ITS WORK IN THE VICINITY
OF EXISTING UTILITIES IN ACCORDANCE WITH THE RESPECTIVE UTILITY'S RULES AND
REGULATIONS. ANY COST INCURRED FOR REMOVING, RELOCATING OR PROTECTING
UTILITIES SHALL BE BORNE BY CONTRACTOR UNLESS INDICATED OTHERWISE.
CONTRACTOR SHALL EXCAVATE TO LOCATE BURIED UTILITIES FAR ENOUGH IN ADVANCE
OF ITS WORK TO ALLOW FOR HORIZONTAL AND /OR VERTICAL ADJUSTMENTS TO ITS
WORK AND/OR THE UTILITIES. NO ADJUSTMENT IN COMPENSATION OR SCHEDULE WILL
BE ALLOWED FOR DELAYS RESULTING FROM CONTRACTOR'S FAILURE TO CONTACT AND
COORDINATE WITH UTILITIES.
GENERAL EROSION AND SEDIMENT CONTROL N
ES-1: UNLESS OTHERWISE INDICATED, AL_ VEGETATiV- AND STRUCTURAL EROSION AND
SEDIMENT CONTROL PRACTICES WILL BE CONSTRUCTED AND MAINTAINED
ACCORDING TO MINIMUM STANDARDS AND SPECIFICATIONS OF THE VIRGINIA
EROSION AND SEDIMENT CONTROL HANDBOOK AND VIRGINIA REGULATIONS VR
625-02-00 EROSION AND SEDIMENT CONTROL REGULATIONS.
ES-2: THE PLAN APPROVING AUTHORITY MUST BE NOTIFIED ONE WEEK PRIOR TO THE
PRE -CONSTRUCTION CONFERENCE, ONE WEEK PRIOR TO THE COMMENCEMENT OF
LAND DISTURBING ACTIVITY, AND ONE WEEK PRIOR TO THE FINAL INSPECTION.
ES-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
REVIEWING AUTHORITY.
ES-6: THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATION OF ANY ADDITIONAL EROSION
CONTROL MEASURES NECESSARY TO PREVENT EROSION AND SEDIMENTATION AS
DETERMINED BY THE PLAN REVIEWING AUTHORITY.
ES-7: ALL DISTURBED ARES ARE TO DRAIN TO APPROVED SEDIMENT CONTROL MEASURES
AT ALL TIMES DURING LAND DISTURBING ACTIVITIES AND DURING SITE
DEVELOPMENT UNTIL FINAL STABILIZATION HAS BEEN ACHIEVED.
ES-8: DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN APPROVED
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.
A
m
r
U
7
w
p
w
5
�o
U
°
O
Z zaN
C•gg �Y� C
J
f-dt maw U
Q
T
J =
OU aC m
aZ =w a
W
O wo 0
UQ M,Q 0
25
J Z v U
Qy'
Z
CE_
W', N
w (7
En
O Z
�
o�
a w
N w
Q z
> O
va w a
J
} V >
=mow
Oaz
o)
•,/
Fil
w o
aIr
m=
rn U
REVISIONS
COUNTY COMMENTS
Feb 15, 2019
COUNTY COMMENTS
April 15, 2019
FOR APPROVAL
May 21, 2019
REV.
MITIGATION
PLANTING AREAS
May 21, 2021
CONTOURS
2 FOOT
DATE
October 22, 20111
SCALE
AS SHOWN
Op
pr��
�o{��AyTH
�
o
U
y
Jimmy L. Taggart
Po
Uc. No.
2 4
05Z 214121 4��
��ss�ONAL 061
r
O
O
O
1
00
zo
W
a_ z
w
r�
Q u-
w
Q
J N>
E-
z
z
_j c� ;
w
Y'
�I>
JUO
w0QO°
w
w
3:z�m�
�OC)
w
�OJ
111
a
oz0
U)
O
Ir
W
06
FILE
NUMBER
8053
SHEET
01 OF 14
WRGA\TMPROA8053-OLD TRAIL\Block 32\ENGINEERING 13WG\8053-OLD TRAIL- Block 32 - WPO.dwa
CONTRACTOR SEQUENCE OF CONSTRUCTION NOTES: 60 0 60 120 180
1. CONTRACTOR SHALL VERIFY ROUGH GRADES FROM MASS GRADING PLAN AND VERIFY ALL EROSION CONTROL EXISTING CONDITIONS SHOWN HEREON
MEASURES ARE INSTALLED PROPERLY AND FUNCTIONING PRIOR TO INSTALLATION OF UTILITIES. SCALE: 1"=60' LEGEND
2. BUILDER LOT PADS ARE PROJECTED TO START ON THE SOUTHEASTERN MOST PART OF THE SITE AND DRAINAGE WILL B E USED A S PHASE 1 EROSION
SHALL BE DIVERTED TO EXISTING SEDIMENT TRAP #1 AND SEDIMENT BASIN AS DEEMED NECESSARY. STEEP SLOPES (PRESERVED)
3. DRAINAGE MAY DIFFER ONSITE FROM PROJECTED CONSTRUCTION AREAS AND CONTRACTOR SHALL NOTIFY ENGINEER o
\IOR TO TAKG ACT.
4. NO MOREOF THAN 3 AC ESCOF ONSI EL DRAINAGE SHALL GO TO PANOY SDEDIMENTPLANPTRAP DU INGINPHASE 01NOF CONTROL PLAN AND IS TAKEN FROM
CONSTRUCTION AND DIVERGENCE TO SEDIMENT BASIN SHALL BE USED TO RELIEVE TRAPS IF NECESSARY. 3;`!:. 100YR FLOODPLAIN
�. 5. CONTRACTOR SHALL WORK WITH EROSION CONTROL INSPECTOR ONSIE FOR ACCEPTABLE METHODS OF ADDRESSING APPROVED AMENDMENT TO BORROW
SITE RUNOFF AND CLOSURE/MODIFICATIONS OF LOCATIONS TO SEDIMENT TRAPS WHILE LOT PADS ARE BEING GRADED. �+
6. SEDIMENT TRAPS AND DIVERSIONS SHALL REMAIN ACTIVE THROUGHOUT ALL PHASES OF CONSTRUCTION (REGARDLESS AREA E S C PLAN (WP 0 2 018 0 010)
\ \ OF LOCATION AND MODIFICATIONS) UNTIL FULL STABILIZATION AND BUILDOUT IS COMPLETED ONSIE.
♦ 7. THE LOCATION OF THE FUTURE BIOFILTER SWM FACILITY SHALL BE ROUGH GRADED SO THAT ONCE STABILIZATION IS �
g -S— S S S S
♦ COMPLETE, THE NECESSARY BIOFILTER PARAMETERS CAN BE CUT IN ACCORDING TO THE APPROVED SWM PLAN. - e. '�
8. THE BIOFILTER SHALL COINCIDE WITH THE EXISTING SEDIMENT BASIN SO THAT IT CAN FUNCTION AS AN EXTENDED PARCEL A
♦ N ~ SoR ze ° tzsx ` MARCH MOUNTAIN PROPERTIES, LLC o
DETENTION FACILITY AS SHOWN ON THE APPROVED SWM PLAN. ♦ \ \ AeccD Pie CCNet i3o DB 4945 PG 413-414 PLAT ep
9. THE PROPOSED ORIFICES SHALL BE CORED INTO SEDIMENT BASIN RISER AND DEWAERING ORIFICE REMOVED SO THAT � . '� � � 6 —6 6
a— a— a— s— s �
THE SEDIMENT BASIN CAN FUNCTION AS AN EXTENDED DETENTION FACILITY WITH THE BIOFILTER.
♦ 10. UPON COMPLETION OF SWM CONVERSION, THE SITE SHALL BE SEEDED AND STABILIZED FOR A FULLY FUNCTIONING ow
SWM FACILITY. ♦, ` m ♦,.►- ►,_ ` \ NSPpck \
♦ _ ' \ �DEM STREAM
_ \\�\ ////STABILIZATION AND
RIPRARIAN BUFFER
}p \
\ _— RDBT3665 PG 606RATION E 6E ST \ •tS ; P \\ \ ' 7Y +\\ 0.0'N`SR\
UACOE TT
B
\ui
ACOE \ WETLANDS—
WETLANDS \\
REMAINING DRAINAGE AREA—Z
TO SF SECTION=
1.13AC TREgM BUFF m �`F*A 1P
LF OF SF=1375 1 REING BI2AINAGE AREA
(DOES NOT EXCEED ALLOWAB SF T 1 1
TO SF SECTION= d 1 1
0.25 ACRES PER 100 IF' ♦ 1/ � � 1 1.13AC I m n�� 1 1 0
Oj �NO�p1nt ,. ._ oExoTEs $%6_ 1°
" \ ♦ - � — R- � LF OF SF=1375
F�MOUN PPRpJP / , / ( ,uewnxSTcou9Tr Pi e A ccNe wo + 1 1
eR * DOES NOT EXCEED ALLOWABLE P6E6E6wo STEEP s �Es s �f s s s s s s
�5s TPS\O m'wpOs` E �'%� 0.25 ACRES PER 100 LF) \ TIOpN APPRL(7T EN /2019 J S 1 1 ny M BUF E LOT EN ROACHMENT s s s —� s 1
.SF / I 1p �\y o I
TP
` 694 oEx ET N `B•,i`,
69a SEB DRST CIXIN
%tE4R4E0 STEEP SL s
wl .n M►,
�AIN +
®sJs;
LIMITS
AND DISTURBANCE (20.80 ��� / s
OF N9om
c 0AOTnT .n5 jp4 �t — �'�-a_� S� - i.�'�./�e✓% \ DI r-- 1 `r
NT
TMP055E0-01-22-00000 �°'/ / /� oor / v ���A� / �� , _gP=gig=, "" � eccuo 1 e worclo � l s s 'L\ /L� / ry _ .p,� D' PUBLIC STORM "'�•
BLOCK 22 \ / / / / no O� \ -- �� DRAT A A \,, DBR2886GPG154ME55 Sg.1 Y Wo `'Ii
MARCH MOUNTAIN / / \ - ♦ m ♦ ,
PROPERTIES, LLC / m / $ \ C9 m m n a \ / ¢ TO ST#2= / \ —
DB 4954 PG 15 24 I / c10 $ \ \ \\ g I e N I I (FAA Tc=16.lmin 6fi �sy m Y I 1=
v
a m . II
y So o
96
P qe
e c
rv
C>
IL I
VIP\ \� / N � \ \ \ N\`\ ,♦ �'" . . I
m\ 'm )III a
TMPO 5E0-K12000
LOC
°
../
M R H OUN AIN P PE IES, LLC /
TI k 2 .267 I DRAINAGE AREA
/RAIiY / �1 / / PS / / / / / I I <¢ € ¢ 10.34A
TO EIIISTI SB=
s ¢
STOOCKKPAILE / / _� � j � DC � DC ' � � I i 1 � 1 (FAA)Tc=1 7minARE
� \ n
\/---� �
a.
,
Q,
]oa — //.og a�-� // / / � � `\ �/ / sab � / / \� a, � ♦, U sr#� �I/ ........::::: I �' `�., f�
D NAGE AREA / z
TO ST#3=
(FAAM=5.9min \ cT J / / / I IF-
\VV/ � � � WASH RACK "VJR" SHALL BE
UACOE----'.'
WETLANDS
vo,3Y / I\ m L �� > / / //, '•/ ", INSTALLED IN ACCORDANCE WITH
,' U z / C16 $� U \ \\ ?e / / / , $F / ATEMPORARV DRAIN PIT AS DEEMED NECESSARY /'
s° J / � / BY ALBEMARLE COUNTY EROSION INSPECTOR
.. ....... �... ............ 1 /'
/\os m\
r
s
/�/G15\v/'\mot 6 //11 mm� �/ pp /\A1// f�.P'(10TpHi.
PIV'�pd P� I �pc tNp. I / A
P0X1
\ o
I"r L / / i' / / , � — 6sz '6%G ' 0 0\5� / � �j
DRAINA E�AREA anti boo 6ae oe€�66 as - \q5 O / / /,
TO ST#1= / / / \\M / / �' fa. r .
D'V \ 2.85AC / / / / t► ♦ • ! i' ... S
' ' jAA)T6=16.1min , ,♦ AN ►/ _ p cvi' ' .�Pr ~ .e l 7 c
OP\-�I 'Vpoy , ... ... . . �..
/ / O
—REMAINING DRAINAGE AREA s — — m / / / / / / _ �i s...... i. i. r....... .
TO SF SECTION= ,� a\ — - -- / �i' / M f ff'.'.'.'.'.'.
- \� /// S / ' , �` far/ L' \ p / 0v
0.65AC TMP 005500-00-00-103F0 ♦ a? _ / r.
LF OF SF=540 MARCH MOUNTAIN \ — _ — - / ! +• . '
DOES NOT EXCEED ALLOWABLE , `�` \ — — — /, / /, bP A / . �. ; ! we �f; s► ^ ^ .. / oa
( PROPERTIES, LLC _
GOLF COURSE � \. _ �-6eoaje' F. �/ �� i �♦ ; F�po/ s>Y'' - y ♦` �.. ', i I
0.25 ACRES PER 100 LF ,IVs� �_ � �- 6� 6iA eTz- 6]0 fibs b6a 66z ♦ � A �= loiC! � 100� � • pob`NPy ,!! � � '
DB 4964 PG 19 (PLAT) , s 6fifi fi6o / pXIM HA / / o .. .
DB 4556 PG 602-609 (PLAT) 2:1 .\\ s''---,1L�� 10 i' F`po�u IN ZE-�' ..✓ .....
DB 4104 PG 701-707 (PLAT) I
I 1
,\ 6]2 s6o — r ■ REMAINING DRAINAGE . '.' '.
DB 3628 PG 308-320 (PLAT) sn6 r 75STREAMBUFFERLOT ENCROACHME TO SF SECTION= """" """' $� TMP
DB 2886 PG 134-155 (PLAT) � 66 1 /yam: *0 R VARIATION APPROVAL (03/06/2019 0.74AC s ► Nv-in Nor 1
" 1 I.F OF SF=1465 ... ..... ... -' 055EO-01-00-000A5 ! 1 1
2:1 ���1aX�♦
(DOES NOT EXCEED ALLOWABLE '..'. �' ♦ i ' e BLOCK DB 3971PG 300-305 1 1
/� ^ / / P\pCo 0.25 ACRES PER 100 LF)
ALL SLOPES GREATER / cP tclf/' .......
�........ i
THAN 3:1 MUST BE....... .N _ —
STABILIZED WITH LOW PtELOPE N?....'...!.......... ...... ,r,� ..... `f,
MAINTENANCE VEGETATIVE i pPPR°�Mi°N
GROUND COVER OTHER i�' EI...Vol
THAN GRASS / . '. '. '. '... : :
/ �♦ —
100-Y_FL�OD�IJ.�,� �. ,�— - ►. . -...................................,'
... ... ... .............................., >�,!� _ —
.1
_
i ........................y...............y . 1 I \ 1 \1
.............................
r;'t....................................... z: i-- TMP 055E0-01-00 000A3
1 \1
r..... .. 00 1\ \
. r•.
♦ ... BLOCKS 24, 33, AND 34040 7
i! f MARCH MOUNTAIN cST `\
/ / I A....
,.. _... "�✓ ' %�- — — — — —� . — ii. DB 30973 PG 34-139
00,
yam. �,� ''0010\ \It
1\
L�
m
r
U
7
w
p
w
U
-°
O
Z zaN
Ol0 02
J
I-m <aw U
Q
T J =
OU ¢U m
dZ =w a
o
Ow � 0
O
OQ 2a
J Z v IE
ZCE
n
�rwl
w, N
W C'3
n
> No
v
d W N V
N W
Q Z
J > O
a w w =
U v J o
J
} rn >
=Zw
Oaz
o)
•,
04
o
w
Ua
m=
rn U
REVISIONS
COUNTY COMMENTS
Feb 15, 2019
COUNTY COMMENTS
April 15, 2019
FOR APPROVAL
May 21, 2019
REV. MITIGATION
PLANTING AREAS
May 21, 2021
CONTOURS
2 FOOT
DATE
October 22, 2018
SCALE
1'=60'
AyTH Op
pr��
U 9-7
Jimmy L. Taggart
Lic2. No. 4
A'Ao OSZ 214121
'Cs'810NAL B�Gl
O
O
O
L ry1
r 00
zo
W
LU
z
w
w d-
q Q
Qz_j()>
W
z
� a-D
JUo
WQQOO
-
W
(�
�z�m�
w
w �J m
z
oz0
�0
w
Ir
06
FILE NUMBER
8053
SHEET
02 OF 14
_j
Q:\RGA\TMPROJ\8053-OLD TRAIL\Block 32\ENGINEERING\DWG\8053-OLD TRAIL- Block 32 - WPO.dwa
r
UACOE
WETLANDS
_ J rREAM BU F
1-ViIATIpNgp RLOTEny.
FR `1 (03= 9ME-ALL SLOPES GREATER
THAN 3:1 MUST BE eno
STABILIZED WITH LOW
DENOTES
MAINTENANCE VEGETATIVE - ALBEMARLE COUNTY
1 •♦. n -` GROUND COVER OTHER PRESERVED STEEP SLOPES
THAN GRASS
(TYP) PROPOSED FENCE
♦` �p ��'_
TIP
00
1 -,MOWN OF LAND DISTURBANCE
I ,
" 40 0 40 80
USING 116 VA DEQ DESIGN SPECIFICATION NO.9: /
BIORETENTION LEVEL 2 DESIGN STORAGE DEPTH = 1.65 FT SCALE: 1"=40' LEGEND
SITE AREA TO BIOFILTER = 156,380 SF = 3.59 ACRES
MANAGED TURF = 1.57 ACRES STEEP SLOPES (PRESERVED)
" IMPERVIOUS COVER = 2.02 ACRES
Rv (FROM VRRM SPREADSHEET) = 0.6
Tv = 1.Oin Rv AREA 12 = 7,819.02 CF
---- BIOFILTER SURFACE AREA REQUIRED = (1.25*Tv)/1.65 FT = 5,923.50 SQ.FT 100YR FLOODPLAIN
BIOFILTER SURFACE AREA PROVIDED = 6,465 SQ.-FT
"
\ pc
�o2 1
\ n o µ p9
" v D
^�� �h Pippe AeccNetwor RIPRAP FOR ENERGY 75' STFFEgM BUFFER LOT s s s s s—DISSIPATION s s s w, p
VARIATION ENCROACHMENT \ \ p
_ 1L (03/06/2019) BIOFILTER PRE-TREATMENT CELL:
TIP�-r 16' x 24'x 3' STONE CHECK
\ DAM
c3UFFER BIOFILTER GRAVEL DIAPHRAGM \ �� o _ a o
\ Boa �JI /
120 \
ao Pry _ 0.80 ACRES / rv' \ D, "/ '� PI
1 n�_ 00 M�_j5[ /� /� bPipe (AeccNetwork S�bPi N ork13=N
a0 7r/ 00 / aQ ` r ■ L 27' PUBLIC STORM d" m 0�,
- _ _ _ ='_!PL X D Lf X / r / �'� UNDERDRAIN C ANOU DRAINAGE EASEMENT
E / tl
X I \ \ DB 2886 PG 134-155 sO mw�
• BIOFILTER
_ DU LE � � " � LE TS
a I I \ „\ I� ` , BIOFILTER: 6,465 SF
a' I - 20' ON CENTER _
\ i GARAGE GARAGE GARAGE GARAGE ' r ' I / / �� \ \ \\\ — — PROVIDED AT ELEVATION p O-
- " I GAR,�GE GAGE I D "'"�-' — ���• 656. FILTER MEDIA 36" ^ 0) U
PROPOSED
y y y BIOFILTER I
I
1 "� "• •��'� OUTLET FOR e _.c 5 —Js s s
\ �-�� _ ' + J �-'` I / `•� •\ �� \ UNDERDRAINS a
II , ---- --- — --- ---- - --- --------- 1 I ' /� �% •� \ w
z 4f
gl �0. .
vq l O IP
II I I \ '7\ 1
W
� I I v
/ I
WCN
1/ chi-
= a \\ I
I
LL
-
C / I
L y
d I
OD
I
. I
J "
�.
P. -
1
NEW V/W SWM I
EASEMENT Of M +, N.
EXTENDED DETENTION
,.
\ \ \ \ I\ BUFFER ZONE (HATCHED)' �� ♦� �' Qw'�".. p'..'.'.'..'.'.'. .
PRACTICES TO BE
USED IN GENERAL \\- L'W \ r U ^ I \ •I•�• �.a� o.P k'.'...'.'...'.'.'.
T HOVER THE PROJECT j 1 \ 1 H �_ �q \ 1 �\� I ma N
CID
vm
Ps
....
�. + \� ,r h ........ .
�s. .. ..........
I-
Di
I � I
\\
,
EMERGENCY SPILLWAY
C, +
/
l
• r
••� AWASH RACK ("WR") SHALL BE
��• I INSTALLED IN ACCORDANCE WITH
/ / THE CONSTRUCTION ENTRANCE AND SLOPE TO
A TEMPORARY DRAIN PIT AS DEEMED NECESSARY 00
BY ALBEMARLE COUNTY EROSION INSPECTOR f
I '
Go
000
00,
00,
I —
00
000 '00 00
1100000
1 --- /
f/
1 \ — i / ' / / / // / /-��'-r-�—�i/ • • I �.......................................
A
' ' ♦ / A N J
�p�\
i / I
.. .. .. .. ....ati... .. .. ... ....•..
.. ... ... ... ... ... .'��` l P��J 1 w .
pp
1 — / / / / / ♦ �� ........ ............................................ .�............................. / .00,- CX
• O s ♦ /
i _ • _ .
�•• _ _,,, k tl p
1 -- - ice/ %"n��.. •��•• . _�,I� .. / C1>p
y I
/ (j _ w ������• NI BUFFER LOT EN / / yo` ��'. / ww� T k
o f _ 000l �.._. .. (3/06/ OHMENT' _ t , Q a� 1 x
�X: / �• 1 ALL SLOPES GREATER- CROA
_ / TMP p
i5'SAREA >o — p
9
0 19 .= /
•• �..�,�.�.',. ... .' '... ....' ... / l 055E0-01-00-000A5 o
M -�:-�L �^ • I THAN 3:1 MUST BE / �- i ✓ - - BLOCK 25 1 N I
■■ STABILIZED WITH LOW c\ •/
GROUND COVER OTHERIVE �VOOp'�i� �� �� DB 3971 PG 300-305MAINTENANCE 1
/ SLABTOWN BRANCH �f'
THAN GRASS NOD.i�• ,-�- I
I00
IIP
CL
a
N\ N
N Q
M
N
I
I
LO
N
N
r
/ /
/
/ N
m
r
U
7
w
p
w
U
d-°
O
Z z U)
O(0 2
tf)J
I —a) Maw U
a
T J =
OU m
¢�
D_ Z = w a
0
O� wo
0
Ma o
IE
J v U
2
ZO
n
w, N
w O
Ir�,,yl
n
0 i No
v
D_ w
N W
a z
> 0
va w a
J
} V >
_ ❑
Oaz
W
.,
04
° o
w
U a
rn=
rn U
REVISIONS
COUNTY COMMENTS
Feb 15, 2019
COUNTY COMMENTS
April 15, 2019
FOR APPROVAL
May 21, 2019
REV. MITIGATION
PLANTING AREAS
May 21, 2021
CONTOURS
2 FOOT
DATE
October 22, 2018
SCALE
1'=40'
TH Op
pr��
Jimmy L. Taggart
Lic2. No. ar
A'16 0 214121
��rs'4IONAL Sl of
r
r
O
O
O
00
z T
wrN W a
C\2
2O� z
o Q i
Q J N >
a.
z
� a-J U o
E-
Lu
LuOQ0WO
m�
o
0
O
fr m
(2)
O z 0 a
w
O
U)
Ir
06
FILE NUMBER
8053
SHEET
03 OF 14
__j
Q:\RGA\TMPROJ\8053-OLD TRAIL\Block 32\ENGINEERING\DWG\8053-OLD TRAIL- Block 32 - \NPO.dwa
Q:\RGA\TMPROJ\8053-OLD TRAIL\Block 32XENGINEERINGDWGN8053-OLD TRAIL- Block 32 - WPO.dwa
Q:\RGA\TMPROJ\8053-OLD TRAIL\Block 32\ENGINEERINGDWG\8053-OLD TRAIL- Block 32 - WPO.dwa
rr
- ♦ r
100 0 100 200 30 ,
SCALE: 1 `100' LEGEND
1II'll'll'llI J DRAINAGE AREA FROM APPROVED
SWM MASTER PLAN
(WP0201600009)
■ENLjmmmLjm PROPOSED DRAINAGEAREA
STEEP SLOPES (PRESERVED)
JII " 1 � ♦ `, �� r2;> 100YR-FLOODPLAIN
1
e "
J 1100' WPO
F y'\
pew • h..:: . �
/
\ 1 �
` PO -DEVELOPMENT 'A\ N w\
DRAINAGE AREA TO
BIOFILTER S-13: 3.61 ACRES \I p
IMPERVIOUS AREA: 2.02 ACRES'N \1 u
(FAA)Tc = 14.5min p u'
- CN = 8
I—\ II JI
IN I
'oil q
D GEBLOC 4,
-e
� 4t � lu I I I I l l'� 1. � •may �� �i ■
/i I j ,/� I �� PI / / TI - ■
/ I
I I ,
\ .� \ ` i /
i
\ • _ i '
PO T-DEVELOPMENT !,I.
/
I
I
\ JI
I
J
\J ,
\J\
I�
\ IJ
1/
/
J / i
� _� �,�� � ,♦ DRAINAGE AREA TO I
EXTENDED DETENTION: 6.77 ACRES / =I
FROM MASTER SWM PLAN MM201600009) — - - - - ' - -� IMPERVIOUS AREA: 2.98 ACRES
LIMITS OF APPROVED DRAINAGE FOR 13MP S 13 �— PPaox;o ``" (FAA)Tc = 14.3 min
i �aoPla"z" I I
W
F�o ,
FROM APPROVED MASTER SWM PLAN (WPO 201600009)
DRAINAGE NARRATIVE:
THE PROPOSED POST -DEVELOPMENT DRAINAGE AREA TO S-13 IS 3.61 ACRES AND
THE POST -DEVELOPMENT DRAINAGE AREA TO EXTENDED DETENTION POND IS 6.77
ACRES. THE APPROVED POST -DEVELOPMENT DRAINAGE AREA TO S-13 FROM THE
MASTER SWM PLAN WP0201600009 IS 9.68 ACRES. THE DIFFERENCE IS ATTRIBUTED
TO THE CHANGE OF THE LOT LAYOUT AND THE FEASIBILITY OF CONSTRUCTING A
STORM NETWORK THAT WORKS WITH THE PROPOSED SITE AND ROAD GRADING. THE
LAYOUT ALLOWS FOR MORE DRAINAGE TO BE ALLOCATED TO THE S-13 FACILITY AND
LESS TO THE S-1 FACILITY, WHICH DIFFERS FROM THE PRELIMINARY DESIGN FROM
THE SWM MASTER PLAN.
S-13 SUMMARY:
PRE -DEVELOPMENT:
TOTAL DRAINAGE AREA = 11.86 ACRES
APPROXIMATE IMPERVIOUS AREA = 0.00 ACRES
POST -DEVELOPMENT:
TOTAL DRAINAGE AREA = 9.68 ACRES
APPROXIMATE IMPERVIOUS AREA = 6.29 ACRES
BMP SIZING:
REQUIRED AREA = 6,852 S.F.
PROVIDED AREA = 6,854 S.F.
WATER QUALITY TREATMENT:
POST -DEVELOPMENT POLLUTANT LOAD = 14.01 (LBS-TPNR)
POLLUTANT REMOVAL EFFICIENCY = 50%
TOTAL ESTIMATED POLLUTANT REMOVAL = 7.01
(LBS-TP/YR)
HYDROLOGIC SUMMARY: 2-YEAR
10-YEAR 100-YEAR
CFS
CFS CFS
PRE -DEVELOPMENT 9.28
27.36 71.94
POST-DEVELOPMENT(UNROUTED) 13.79
28.48 58.47
POST-DEVELOPMENT(ROUTED) 1.75
26.15 58.86
ROUTED PEAK ELEVATIONS: 2-YEAR
10-YEAR 100-YEAR
FT
FT FT
POST -DEVELOPMENT 641.77
642.75 644.03
�I
r
U
7
w
p
w
^
�o
U
-°
O N
O
Z Z
Oro �Y� �
J
Ha) maw U
Q
T J =
ILL
m
aU =W
Ir
IM o D
0 55 w J 0
OQ 2,
J Z v U
z� �
¢_
,
a)
N
W(5
x
cn
n
a_ o
o w
N w
Q Z
>
O
va w a
J
>- V >
=Zw
OaZ
.,
04
S 0
w
�Q
rn U
REVISIONS
COUNTY COMMENTS
Feb 15, 2019
COUNTY COMMENTS
April 15, 2019
FOR APPROVAL
May 21, 2019
REV. MITIGATION
PLANTING AREAS
May 21, 2021
CONTOURS
2 FOOT
DATE
October 22, 2018
SCALE
AyTH Op
pr��
Jimmy L. Taggart
Lic. No. 4
Ado ToOS4121
��"`s'470NAL B�Gl
o
o
a
o
00
zo
z
�Ow z
(5
(3 Q
Q
Q J N>
z z J c� ;
z
_j>yz
JUOo
a
Ir LuJ 0°
W
Q��mQ
Q
�00 m
OC (� J J
a
Oz0 Q
O
O
Ir
o
w
06
FILE NUMBER
8053
SHEET
06 OF 14
__j
Q:\RGA\TM PROJ\8053-OI
IL\BIock 32\ENGINEERINGIDWG\8053-OLD TRAIL- Block 32 - WPO.dwa
FA
PRIOR TO CONSTRUCTION
1. OWNER SHALL POST SURETY BONDS FOR CONSTRUCTION, EROSION &
SEDIMENT CONTROL.
2. CONTRACTOR SHALL OBTAIN PERMITS TO WORK WITHIN STATE
RIGHT-OF-WAY VDOT LAND -USE PERMIT). BONDING FOR WORK WITHIN THE
VDOT RIGHT-OF-WAY MAY BE REQUIRED TO OBTAIN THE PERMIT.
3. CONTRACTOR SHALL COORDINATE WITH OWNER TO OBTAIN VSMP PERMITS, AS
REQUIRED BY THE STATE DEPARTMENT OF ENVIRONMENTAL QUALITY (DEQ).
4. CONTRACTOR SHALL OBTAIN LAND DISTURBANCE PERMIT FROM THE COUNTY
OF ALBEMARLE PRIOR TO BEGINNING CONSTRUCTION.
5. A PRE -CONSTRUCTION MEETING WITH THE ENGINEER, THE CERTIFIED LAND
DISTURBER AND THE ENVIRONMENTAL INSPECTOR MAY ALSO BE REQUIRED.
ALLOW 72 HOURS FOR COORDINATION AND SCHEDULING OF
PRE -CONSTRUCTION MEETING.
PROJECT DESCRIPTION
THIS PROJECT PROPOSES TO PROVIDE SWIM FOR THE DEVELOPEMENT OF BLOCK
32 IN OLD TRAIL VILLAGE. THE EXCESS DIRT WILL BE STOCKPILED ON THE WEST
SECTION OF THE DEVELOPMENT. GRADING INVOLVED WITH THIS PLAN WILL
COINCIDE WITH FINAL SITE PLAN GRADES. LIMITS OF DISTURBANCE WILL INCLUDE
APPROX. 20.80 ACRES.
EXISTING SITE CONDITIONS
THE CURRENT CONDITONS OF BLOCK 32 CONSISTS OF MODERATE TREE COVER
WITH VIRGIN SOL TERRAIN WHICH IS BOUNDED BY STREAMS TO THE NORTH AND
SOUTH OF THE PROPERTY.
ADJACENT AREAS
THE SOUTHERN ADJACENT AREAS CONSISTS OF MULTI -FAMILY DEVELOPMENTS OF
BLOCKS 19, 24, 25, AND 33 OF OLD TRAIL VILLAGE. TO THE NORTH OF THE
PROJECT CONSISTS OF BLOCK 22 AND DENSTOCK APARTMENTS. OLD TRAIL DRIVE
RUNS ALONG THE EASTERN SIDE OF THE DEVELOPMENT.
OFF -SITE AREAS
ALL EXCESS MATERIAL GENERATED AS PART OF THIS PROJECT SHALL BE HAULED
TO A LOCATION WITHIN THE OLD TRAIL DEVELOPMENT THAT HAS BEEN APPROVED
BY THE COUNTY OF ALBEMARLE COMMUNITY DEVELOPMENT DEPARTMENT.
SOILS
36C--HAYESVILLE LOAM. (7% TO 15% SLOPES)
DEEP, MODERATELY SLOPING AND WELL DRAINED. STARTING AT SURFACE LAYER
TO SUBSTRATUM, SOIL LAYERS CONSIST OF LOAM, CLAY, SANDY CLAY LOAM, AND
FINE SANDY LOAM.PERMEABILITY IS MODERATE WHILE AVAILABLE WATER CAPACITY
IS MODERATELY HIGH. SURFACE RUNOFF IS MEDIUM. HAZARD OF EROSION IS
SLIGHT.
26C3 -DYKE CLAY LOAM. SEVERELY ERODED. (7% TO 15% SLOPE)
DEEP, MODERATELY SLOPING AND WELL DRAINED. STARTING AT SURFACE LAYER
TO SUBSTRATUM, SOIL LAYERS CONSIST OF CLAY LOAM, CLAY, AND GRAVELLY
CLAY. PERMEABILITY IS MODERATE WHILE AVAILABLE WATER CAPACITY IS
MODERATELY HIGH TO HIGH. SURFACE RUNOFF IS MEDIUM. HAZARD OF EROSION IS
SLIGHT.
37D3 - HAYESVILLE CLAY LOAM, SEVERELY ERODED. (15% TO 25% SLOPES)
SOIL IS DEEP, STRONGLY SLOPING AND WELL DRAINED. STARTING AT SURFACE
LAYER TO SUBSTRATUM, SOIL LAYERS CONSIST OF CLAY LOAM, CLAY, SANDY
CLAY LOAM, AND FINE SANDY LOAM. PERMEABILITY IS MODERATE WHILE
AVAILABLE WATER CAPACITY IS MODERATELY HIGH. SURFACE RUNOFF IS HIGH.
HAZARD OF EROSION IS MODERATE.
4E - ASHE LOAM. (25% TO 45% SLOPES)
DEEP, STRONGLY SLOPING AND SOMEWHAT EXCESSIVELY DRAINED. STARTING AT
SURFACE LAYER TO SUBSTRATUM SOIL LAYERS CONSIST OF LOAM SANDY LOAM
AND BEDROCK PERMEABILITY IS MODERATE WHILE AVAILABLE WATER CAPACITY IS
LOW. SURFACE RUNOFF IS MEDIUM. HAZARD OF EROSION IS MODERATE
25B - DYKE SILT LOAM, 2% TO 7% SLOPES
DEEP, NEARLY LEVEL AND WELL DRAINED. STARTING AT SURFACE LAYER TO
SUBSTRATUM, SOIL LAYERS CONSIST OF SILT LOAM, CLAY, AND GRAVELLY CLAY.
PERMEABILITY IS MODERATE WHILE AVAILABLE WATER CAPACITY IS MODERATELY
HIGH TO HIGH. HAZARD OF EROSION IS SLIGHT.
7B - BRADDOCK LOAM, (2% TO 7% SLOPES)
DEEP NEARLY LEVEL AND WELL DRAINED. STARTING AT SURFACE LAYER TO
SUBSTRATUM SOIL LAYERS CONSIST OF LOAM AND CLAY. PERMEABILITY IS
MODERATE WHILE AVAILABLE WATER CAPACITY IS MODERATELY HIGH. HAZARD OF
EROSION IS SLIGHT.
77 - RIVERVIEW-CHEWACLA COMPLEX, I TO 2% SLOPES)
DEEP, NEARLY LEVEL WELL DRAINED SOILS ON FLOODPLAINS. STARTING AT
SURFACE LAYER TO SUBSTRATUM, SOIL LAYERS CONSIST OF LOAM AND SILT
LOAM OR SILT CLAY LOAM. PERMEABILITY IS HIGH WHILE AVAILABLE WATER
CAPACITY IS MODERATELY HIGH. OCCASIONAL FREQUENCY OF FLOODING. HAZARD
OF EROSION IS SLIGHT.
CRITICAL AREAS
A. WETLANDS AND STREAM CROSSINGS
B. STEEP SLOPES
THE CONSTRUCTION OF THE MASS GRADE AREAS WILL DISTURB CRITICAL
SLOPE AREAS, WHICH IS SHOWN ON THE OLD TRAIL ZMA. PERMANENT
SEEDING AND MATTING SHALL BE USED STABILIZE ALL SLOPES STEEPER
THAN 3H:1 V
STRUCTURAL PRACTICES
1. SAFETY FENCE 3.01) - A TEMPORARY SAFETY FENCE SHALL BE
CONSTRUCTED WHERE DEEMED NECESSARY DURING CONSTRUCTION TO
PROTECT THE MANHOLES AND SANITARY LINE FROM CONSTRUCTION TRAFFIC.
2. TEMPORARY CONSTRUCTION ENTRANCE 3.02 - A TEMPORARY
CONSTRUCTION ENTRANCE SHALL BE INSTALLED AT SITE ENTRANCE OFF OF
OLD TRAIL DRIVE.
3. ROAD STABILIZATION (3.03) - ACCESS ROADS, PARKING AREAS, AND OTHER
ON -SITE VEHICLE TRANSPORTATION ROUTES SHALL BE STABILIZED WITH
STONE IMMEDIATELY AFTER GRADING.
4. SILT FENCE BARRIER (3.051 - SILT FENCE BARRIERS WILL BE INSTALLED TO
FILTER RUNOFF FROM SHEET FLOW AS INDICATED ON THE EROSION AND
SEDIMENT CONTROL PLAN.
5. SUPER SILT FENCE BARRIER - WIRE -REINFORCED SILT FENCE BARRIER WILL
BE INSTALLED TO FILTER RUNOFF FROM SHEET FLOW AS INDICATED ON THE
EROSION AND SEDIMENT CONTROL PLAN.
VEGETATIVE PRACTICES
1. SURFACE ROUGHENING (3.29) - ALL AREAS WITH A GRADE STEEPER THAN
3:1 SHALL BE STAIR -STEP GRADED OR GROOVED PLATE 3 29-4 TO AID IN
GRASS ESTABLISHMENT, INCREASE INFILTRATION, AND TO SLOW RUNOFF
VELOCITIES.
2. TOPSOILING & STOCKPILING (3.30Z - TOPSOIL WILL BE STRIPPED FROM
AREAS TO BE GRADED AND STOCKPILED FOR LATER USE. STOCKPILES ARE
TO BE STABILIZED WITH TEMPORARY VEGETATION OR TO HAVE SILT FENCE
INSTALLED ALONG THE LOWER PERIMETER TO PROTECT DOWNSTREAM AREAS.
3. TEMPORARY SEEDING (3.31) - AREAS NOT BROUGHT TO FINAL GRADE FOR A
PERIOD OF MORE THAN 14 DAYS SHALL BE STABILIZED WITH A TEMPORARY
SEED MIXTURE ACCEPTABLE FOR THAT TIME OF YEAR. CRIMPING, PUNCH
ROLLER -TYPE ROLLERS, OR TRACK WALKING MAY BE USED TO
INCORPORATE STRAW MULCH INTO THE SOIL ON SLOPES IF STRAW IS TO BE
USED.
4. PERMANENT SEEDING (3.= - AREAS BROUGHT TO FINAL GRADE OR THOSE
CONSTRUCTION AREAS THAT WILL REMAIN DORMANT FOR YEAR OR MORE
SHALL BE STABILIZED WITH A PERMANENT SEED MIXTURE ACCEPTABLE TO
THAT TIME OF YEAR. PREPARE SURFACE WITH APPROVED TREATMENT AND
ADDITIVES PRIOR TO APPLYING SEED.
5. MULCH {3.35Z - PLANT RESIDUES OR OTHER SUITABLE MATERIALS SHALL BE
APPLIED TO DISTURBED SURFACES TO PREVENT EROSION AND REDUCE
OVERLAND FLOW VELOCITIES. THIS PRACTICE SHOULD BE APPLIED TO ALL
SEEDING OPERATIONS, OTHER PLANTER MATERIALS WHICH DO NOT PROVIDE
ADEQUATE SOIL PROTECTION BY THEMSELVES, AND BARE AREAS WHICH
hL
CANNOT BE SEEDED DUE TO THE SEASON BUT WHICH STILL NEED
PROTECTION TO PREVENT SOIL LOSS. CRIMPING, PUNCH ROLLER -TYPE
ROLLERS, OR TRACK WALKING MAY BE USED TO INCORPORATE STRAW MULCH
INTO THE SOIL ON SLOPES IF STRAW IS TO BE USED.
6. EROSION CONTROL BLANKETS (3.36) - EROSION CONTROL BLANKETS IN
CONJUNCTION WITH PERMANENT SEEDING WILL BE INSTALLED ON ALL SLOPES
STEEPER THAN 3:1 FOLLOWING GRADING. EROSION CONTROL BLANKETS WILL
ALSO BE INSTALLED IN DITCHES WHERE POTENTIAL EROSIVE VELOCITIES MAY
EXIST AS DETERMINED BY ENGINEERING CALCULATIONS. THIS WILL PROTECT
FROM RILL AND GULLY EROSION.
7. TREE PROTECTION 3.38)- THE TREE FENCE BARRIER WILL BE INSTALLED
TO PROTECT THE TREES OUTSIDE OF THE LIMITS OF DISTURBANCE AS
INDICATED ON THE EROSION AND SEDIMENT CONTROL PLAN.
8. DUST CONTROL (3.39) - DUST CONTROL METHODS MUST BE USED TO
REDUCE THE AMOUNT OF AIRBORNE DUST DURING ALL PHASES OF
CONSTRUCTION WHERE SOIL IS EXPOSED OR DISTURBED.
MANAGEMENT STRATEGIES
1. CONSTRUCTION WILL BE SEQUENCED SO THAT GRADING OPERATIONS CAN BE
SEQUENCED, AND ALSO BEGIN AND END AS QUICKLY AS POSSIBLE.
2. THE CONSTRUCTION ENTRANCE AND PERIMETER EROSION CONTROL MEASURES
SUCH AS TREE PROTECTION AND SILT FENCE SHALL BE INSTALLED AS THE
FIRST STEP OF DISTURBANCE.
3. SEDIMENT BASIN MEASURES SHALL BE INSTALLED WITH PERIMETER SILT
FENCE PRIOR TO ANY GRADING AND SHALL BE SEEDED AND MULCHED
IMMEDIATELY FOLLOWING INSTALLATION.
4. THE SEDIMENT BASIN SHALL BE CHECKED FOR SEDIMENT ACCUMULATION
AFTER EVERY RUNOFF PRODUCING STORM EVENT. SEDIMENT SHOULD BE
REMOVED WHEN IT REACHES ONE-HALF OF THE DESIGN VOLUME OF THE WET
STORAGE.
5. TEMPORARY SEEDING OR OTHER STABILIZATION METHODS, SUCH AS BASE
AGGREGATE WILL FOLLOW IMMEDIATELY AFTER REACHING FINAL GRADES.
6. ALL SEEDED AREAS WILL BE CHECKED REGULARLY TO ENSURE THAT A GOOD
STAND IS MAINTAINED. AREAS SHOULD BE FERTILIZED AND RE -SEEDED AS
NEEDED TO ESTABLISH GROWTH..
7. THE JOB SUPERINTENDENT SHALL BE RESPONSIBLE FOR THE INSTALLATION
AND MAINTENANCE OF ALL EROSION AND SEDIMENT CONTROL PRACTICES.
8. DURING FINE GRADING OPERATIONS, MAINTAIN ALL DIVERSION DITCHES TO
THE SEDIMENT TRAPS. THE SEDIMENT TRAPS SHALL REMAIN FUNCTIONAL
THROUGHOUT INSTALLATION OF THE STORM SEWER INLETS, PIPES,OUTFALLS.
9. INSTALL SILT FENCE INLET PROTECTION TRAPPING MEASURES AT EACH INLET
LOCATION WITHIN THE DITCH WHERE APPLICABLE.
10. WHILE THE SEDIMENT BASIN REMAINS FUNCTIONAL FOR THE DISTURBED AREA,
INSTALL THE PERMANENT EXTENDED DETENTION PONDS AND OUTLET
PROTECTION MEASURES PER THE SPECIFICATIONS.
11. AFTER BEING NOTIFIED BY THE EROSION AND SEDIMENT CONTROL
ADMINISTRATOR, THE TEMPORARY EROSION AND SEDIMENT CONTROLS CAN BE
CLEANED UP OR REMOVED, AND THE SEDIMENT TRAPS CAN BE FILLED IN
AND SEEDED, THEREBY REDIRECTING DRAINAGE TO THE PERMANENT
FACILITIES.
12. THE STORMWATER MANAGEMENT FACILITIES SHOULD BE CHECKED REGULARLY
BY THE HOMEOWNERS ASSOCIATIONS TO ENSURE THAT THEY ARE
STRUCTURALLY SOUND AND HAVE NOT BEEN DAMAGED BY EROSION. THE
EMERGENCY SPILLWAY SHALL BE CHECKED REGULARLY TO ENSURE THAT ITS
LINING IS WELL ESTABLISHED AND EROSION RESISTANT. GRASS SHALL BE
KEPT MOWN BELOW A HEIGHT OF 15" AND THE OUTLET SHOULD BE CHECKED
FOR CLOGGING. THE DAM SECTION SHALL BE KEPT FREE OF SAPLINGS OR
TREES.(REFER TO THE ADDITIONAL MAINTENANCE SPECIFICATIONS)
PERMANENT STABILIZATION
ALL AREAS DISTURBED BY CONSTRUCTION SHALL BE STABILIZED WITH STRAW &
SEED IMMEDIATELY FOLLOWING FINISHED GRADE. SEEDING SHALL BE DONE WITH
KENTUCKY 31 TALL FESCUE IN ACCORDANCE TO STANDARD AND SPECIFICATION
3.32, PERMANENT SEEDING, OF THE VIRGINIA EROSION AND SEDIMENT CONTROL
HANDBOOK. ANY FERTILIZER AND LIME APPLICATIONS SHALL BE IN ACCORDANCE
WITH SOIL TEST RESULTS. ALL SEEDED AREAS WILL BE STRAW MULCHED TO
PROTECT AGAINST RILL EROSION AND TO PRESERVE SOIL MOISTURE THAT WILL
ENHANCE SEED GERMINATION. CRIMPING, PUNCH ROLLER -TYPE ROLLERS, OR
TRACK WALKING MAY BE USED TO INCORPORATE STRAW MULCH INTO THE SOIL ON
SLOPES IF STRAW IS TO BE USED.
EROSION CONTROL MAINTENANCE
1. IN GENERAL ALL EROSION AND SEDIMENT CONTROL MEASURES SHALL BE
CHECKED DAILY AND AFTER EACH SIGNIFICANT RAINFALL. THE FOLLOWING
ITEMS WILL BE CHECKED IN PARTICULAR:
2. THE CONSTRUCTION ENTRANCE SHALL BE CHECKED DAILY FOR SOIL BUILDUP.
IF THE ENTRANCE BECOMES CLOGGED WITH SOIL AND FAILS TO PREVENT THE
TRANSPORTATION OF SOIL ONTO THE ROADWAY, ADDITIONAL STONE,
REPLACEMENT OF STONE, OR A WASH -RACK MAY BE REQUIRED.
3. SILT FENCE SHALL BE INSPECTED IMMEDIATELY AFTER EACH RAINFALL AND
AT LEAST DAILY DURING PROLONGED RAINFALL. CLOSE ATTENTION SHALL BE
PAID TO THE REPAIR OF DAMAGED SILT FENCE RESULTING FROM END RUNS
AND UNDERCUTTING. SHOULD THE FABRIC ON A SILT FENCE DECOMPOSE OR
BECOME INEFFECTIVE PRIOR TO THE END OF THE EXPECTED USABLE LIFE
AND THE BARRIER STILL BE NECESSARY, THE FABRIC SHALL BE REPLACED
PROMPTLY. SEDIMENT DEPOSITS SHOULD BE REMOVED AFTER EACH STORM
EVENT. THEY MUST BE REMOVED WHEN DEPOSITS REACH APPROXIMATELY
ONE-HALF THE HEIGHT OF THE BARRIER. ANY SEDIMENT DEPOSITS
REMAINING IN PLACE AFTER THE SILT FENCE IS NO LONGER REQUIRED SHALL
BE DRESSED TO CONFORM WITH THE EXISTING GRADE, PREPARED, AND
SEEDED.
4. DIVERSION DIKES SHALL BE INSPECTED AFTER EVERY STORM AND REPAIRS
MADE TO THE DIKE, FLOW CHANNEL, OUTLET, OR SEDIMENT TRAPPING
FACILITY AS NECESSARY. ONCE EVERY TWO WEEKS, WHETHER A STORM
EVENT HAS OCCURRED OR NOT, THE MEASURE SHALL BE INSPECTED AND
REPAIRS MADE IF NEEDED. DAMAGES CAUSED BY CONSTRUCTION TRAFFIC OR
OTHER ACTIVITY MUST BE REPAIRED BEFORE THE END OF EACH WORKING
DAY.
5. STORMWATER CONVEYANCE CHANNELS (WHERE APPLICABLE):
5.1. GRASS LINED CHANNELS - DURING THE INITIAL ESTABLISHMENT, GRASS
LINED CHANNELS SHOULD BE REPAIRED IMMEDIATELY AND
RE-ESTABLISHED IF NECESSARY. AFTER GRASS HAS BECOME
ESTABLISHED, THE CHANNEL SHOULD BE CHECKED PERIODICALLY TO
DETERMINE IF THE GRASS IS WITHSTANDING FLOW VELOCITIES WITHOUT
DAMAGE. IF THE CHANNEL IS TO BE MOWED, IT SHOULD BE DONE IN A
MANNER THAT IT WILL NOT DAMAGE THE GRASS.
5.2. RIPRAP-LINED CHANNELS - RIPRAP LINED CHANNELS SHOULD BE
CHECKED PERIODICALLY TO ENSURE THE SCOUR IS NOT OCCURRING
BENEATH FABRIC UNDERLINING OF THE RIPRAP LAYER. THE CHANNEL
SHOULD ALSO BE CHECKED TO DETERMINE THE STONES ARE NOT
DISLODGED BY LARGE
FLOWS.
5.3. IF SEDIMENT IS DEPOSITED IN A GRASS -LINED CHANNEL, IT SHOULD BE
REMOVED PROMPTLY TO PREVENT DAMAGE TO THE GRASS. SEDIMENT
DEPOSITED IN A RIPRAP CHANNEL SHOULD BE REMOVED WHEN IT
REDUCES THE CAPACITY OF THE CHANNEL.
6. CHECK DAMS SHALL BE CHECKED FOR SEDIMENT ACCUMULATION AFTER
EVERY RUNOFF PRODUCING STORM EVENT. SEDIMENT SHOULD BE REMOVED
WHEN IT REACHES ONE-HALF OF THE ORIGINAL HEIGHT OF THE MEASURE.
REGULAR INSPECTIONS SHALL BE MADE TO INSURE THE CENTER OF EACH
DAM IS LOWER THAN THE EDGES. EROSION CAUSED BY HIGH FLOWS AROUND
THE EDGES OF THE DAM SHOULD BE CORRECTED IMMEDIATELY.
7. THE EARTHEN EMBANKMENTS SHALL BE CHECKED REGULARLY TO ENSURE
THAT IT IS STRUCTURALLY SOUND AND HAS NOT BEEN DAMAGED BY
EROSION OR CONSTRUCTION EQUIPMENT.
8. THE STORMWATER MANAGEMENT FACILITIES SHOULD BE CHECKED REGULARLY
BY THE HOMEOWNERS ASSOCIATIONS TO ENSURE THAT THEY ARE
STRUCTURALLY SOUND AND HAVE NOT BEEN DAMAGED BY EROSION.
9. THE EMERGENCY SPILLWAY SHALL BE CHECKED REGULARLY TO ENSURE THAT
ITS LINING IS WELL ESTABLISHED AND EROSION RESISTANT. GRASS SHALL BE
KEPT MOWN BELOW A HEIGHT OF 15" AND THE OUTLET SHOULD BE CHECKED
FOR CLOGGING.
10. THE DAM SECTION SHALL BE KEPT FREE OF SAPLINGS OR TREES.(REFER TO
THE ADDITIONAL MAINTENANCE SPECIFICATIONS)
11. ALL SEEDED AREAS WILL BE CHECKED REGULARLY TO ENSURE THAT A GOOD
STAND IS MAINTAINED. AREAS SHOULD BE FERTILIZED AND RE -SEEDED AS
NEEDED. IN THE EVENT THAT THE APPLIED SEEDING FAILS TO TAKE HOLD,
BLANKET MATTING SHALL BE PLACED IN APPROPRIATE AREAS DEEMED
NECESSARY BY THE ENGINEER OR EROSION CONTROL INSPECTOR.
SEQUENCE OF CONSTRUCTION
1. EXISTING CONDITIONS SHOWN ON SHEET 2 WILL BE USED AS PHASE 1
EROSION CONTROL PLAN AND IS TAKEN FROM APPROVED AMENDMENT TO
BORROW AREA ESC PLAN (WPO20180010). FOR EXECUTION OF PHASE 2 OF
ESC SHOWN ON SHEET 3, CONTRACTOR SHALL COORDINATE A
PRE -CONSTRUCTION MEETING AFTER OBTAINING ALL PERMITS, ALLOWING 72
HOURS FOR ITS COORDINATION.
2. CONTRACTOR SHALL VERIFY ROUGH GRADES FROM MASS GRADING PLAN AND
VERIFY ALL EROSION CONTROL MEASURES ARE INSTALLED PROPERLY AND
FUNCTIONING PRIOR TO INSTALLATION OF UTILITIES.
3. BUILDER LOT PADS ARE PROJECTED TO START ON THE SOUTHEASTERN MOST
PART OF THE SITE AND DRAINAGE SHALL BE DIVERTED TO EXISTING
SEDIMENT TRAP #1 AND SEDIMENT BASIN AS DEEMED NECESSARY.
4. DRAINAGE MAY DIFFER ONSITE FROM PROJECTED CONSTRUCTION AREAS AND
CONTRACTOR SHALL NOTIFY ENGINEER OF RECORD FOR ANY NECESSARY
ALTERATIONS FROM THE APPROVED PLAN PRIOR TO TAKING ACTION.
5. NO MORE THAN 3 ACRES OF ONSITE DRAINAGE SHALL GO TO ANY SEDIMENT
TRAP DURING PHASE 1 OF CONSTRUCTION AND DIVERGENCE TO SEDIMENT
BASIN SHALL BE USED TO RELIEVE TRAPS IF NECESSARY.
6. CONTRACTOR SHALL WORK WITH EROSION CONTROL INSPECTOR ONSITE FOR
ACCEPTABLE METHODS OF ADDRESSING SITE RUNOFF AND
CLOSURE/MODIFICATIONS OF LOCATIONS TO SEDIMENT TRAPS WHILE LOT
PADS ARE BEING GRADED.
7. SEDIMENT TRAPS AND DIVERSIONS SHALL REMAIN ACTIVE THROUGHOUT ALL
PHASES OF CONSTRUCTION (REGARDLESS OF LOCATION AND MODIFICATIONS)
UNTIL FULL STABILIZATION AND BUILDOUT IS COMPLETED ONSITE.
8. THE LOCATION OF THE FUTURE BIOFILTER SWIM FACILITY SHALL BE ROUGH
GRADED SO THAT ONCE STABILIZATION IS COMPLETE, THE NECESSARY
BIOFILTER PARAMETERS CAN BE CUT IN ACCORDING TO THE APPROVED SWIM
PLAN.
9. THE BIOFILTER SHALL COINCIDE WITH THE EXISTING SEDIMENT BASIN SO THAT
IT CAN FUNCTION AS AN EXTENDED DETENTION FACILITY AS SHOWN ON THE
APPROVED SWM PLAN.
10. THE PROPOSED ORIFICES SHALL BE CORED INTO SEDIMENT BASIN RISER AND
DEWATERING ORIFICE REMOVED SO THAT THE SEDIMENT BASIN CAN FUNCTION
AS AN EXTENDED DETENTION FACILITY WITH THE BIOFILTER.
10. UPON COMPLETION OF SWIM CONVERSION, THE SITE SHALL BE SEEDED AND
STABILIZED FOR A FULLY FUNCTIONING SWM FACILITY.
11. SHOULD THE TEMPORARY CONSTRUCTION ENTRANCE OFF OF OLD TRAIL DRIVE
NOT BE MAINTAINED PROPERLY OR AN EXCESSIVE AMOUNT OF SOIL FOUND
TRACKED ONTO THE PUBLIC ROADWAY THEN A PAVED CONSTRUCTION
ENTRANCE, WATER TANKER TRUCK WITH TWO (2) PRESSURE WASHERS AND A
SETTLING AREA MAY BE REQUIRED BY THE EROSION AND SEDIMENT CONTROL
PROGRAM ADMINISTRATOR.
12. STOCKPILE TOPSOIL WITHIN AN AREA ON THE PROPERTY OWNED BY OLD
TRAIL AT A LOCATION APPROVED BY ALBEMARLE COUNTY COMMUNITY
DEVELOPMENT. INSTALL SILT FENCE AT THE PERIMETER OF STOCKPILES .
13. DENUDED AREAS SHALL DRAIN TO AN APPROVED EROSION CONTROL
MEASURE AT ALL TIMES DURING CONSTRUCTION.
14. CONTRACTOR SHALL COORDINATE INSPECTIONS, AS REQUIRED BY THE
ABLEMARLE COUNTY SERVICE AUTHORITY, PRIOR TO MAKING THE SEWER
SYSTEM OPERATIONAL.
15. PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO ALL
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 FOR LONGER THAN 30 DAYS.
PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS THAT ARE TO BE
LEFT DORMANT FOR MORE THAN ONE YEAR.
16. LIME, FERTILIZE AND APPLY TEMPORARY OR PERMANENT SEEDING TO ALL
DENUDED AREAS IMMEDIATELY AFTER ACHIEVING FINAL GRADES.
17. ALL PERMANENT SLOPES STEEPER THAN 3:1 SHALL RECEIVE STABILIZATION
WITH LANDSCAPING VEGETATION HARDIER THAN GRASS, WHICH WILL NOT
REQUIRE MOWING.
18. AFTER SITE IS STABILIZED AND PERMISSION IS OBTAINED FROM THE EROSION
CONTROL INSPECTOR, REMOVE SILT FENCING AND OTHER REMAINING EROSION
CONTROL MEASURES.
EROSION AND SEDIMENT CONTROL MINIMUM STANDARDS
1. 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 FOR LONGER THAN 14 DAYS.
PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS THAT ARE TO BE
LEFT DORMANT FOR MORE THAN ONE YEAR.
CONTRACTOR SHALL ESTABLISH A STABILIZED SITE, AND NOT ALLOW ANY
SEDIMENT TO EXIT THE PROJECT LIMITS.
2. DURING CONSTRUCTION OF THE PROJECT, SOIL STOCKPILES AND BORROW
AREAS SHALL BE STABILIZED OR PROTECTED WITH SEDIMENT TRAPPING
MEASURES. THE APPLICANT IS RESPONSIBLE FOR THE TEMPORARY
PROTECTION AND PERMANENT STABILIZATION OF ALL SOIL STOCKPILES ON
SITE AS WELL AS BORROW AREAS AND SOIL INTENTIONALLY TRANSPORTED
FROM THE PROJECT SITE.
CONTRACTOR TO PROTECT STOCKPILE AREAS WITH SILT FENCE.
3. A PERMANENT VEGETATIVE COVER SHALL BE ESTABLISHED ON DENUDED
AREAS NOT OTHERWISE PERMANENTLY STABILIZED. PERMANENT VEGETATION
SHALL NOT BE CONSIDERED ESTABLISHED UNTIL A GROUND COVER IS
ACHIEVED THAT IS UNIFORM, MATURE ENOUGH TO SURVIVE AND WILL INHIBIT
EROSION.
CONTRACTOR SHALL ESTABLISH A VEGETATIVE COVER ON ALL DENUDED AREAS.
4. SEDIMENT BASINS AND TRAPS, PERIMETER DIKES, SEDIMENT BARRIERS AND
OTHER MEASURES INTENDED TO TRAP SEDIMENT SHALL BE CONSTRUCTED AS
A FIRST STEP IN ANY LAND -DISTURBING ACTIVITY AND SHALL BE MADE
FUNCTIONAL BEFORE UPSLOPE LAND DISTURBANCE TAKES PLACE.
CONTRACTOR SHALL ESTABLISH THE PERIMETER CONTROLS OF SUPER SILT FENCE
AS THE FIRST STEP OF THE LANDS DISTURBANCE FOR THIS PROJECT.
5. STABILIZATION MEASURES SHALL BE APPLIED TO EARTHEN STRUCTURES
SUCH AS DAMS, DIKES AND DIVERSIONS IMMEDIATELY AFTER INSTALLATION.
CONTRACTOR SHALL INSPECT EROSION CONTROL MEASURES AFTER EACH
RAINFALL EVENT.
6. SEDIMENT TRAPS AND SEDIMENT BASINS SHALL BE DESIGNED AND
CONSTRUCTED BASED UPON THE TOTAL DRAINAGE AREA TO BE SERVED BY
THE TRAP OR BASIN.
THERE ARE NO SEDIMENT TRAPS OR BASINS PROPOSED.
A. THE MINIMUM STORAGE CAPACITY OF A SEDIMENT TRAP SHALL BE 134 CUBIC
YARDS PER ACRE OF DRAINAGE AREA AND THE TRAP SHALL ONLY CONTROL
DRAINAGE AREAS LESS THAN THREE ACRES.
B. SURFACE RUNOFF FROM DISTURBED AREAS THAT IS COMPRISED OF FLOW
FROM DRAINAGE AREAS GREATER THAN OR EQUAL TO THREE ACRES SHALL
BE CONTROLLED BY A SEDIMENT BASIN. THE MINIMUM STORAGE CAPACITY OF
A SEDIMENT BASIN SHALL BE 134 CUBIC YARDS PER ACRE OF DRAINAGE
AREA. THE OUTFALL SYSTEM SHALL AT A MINIMUM MAINTAIN THE
STRUCTURAL INTEGRITY OF THE BASIN DURING A 25-YEAR STORM OF
24-HOUR DURATION. RUNOFF COEFFICIENTS USED IN RUNOFF CALCULATIONS
SHALL CORRESPOND TO A BARE EARTH CONDITION OR THOSE CONDITIONS
EXPECTED TO EXIST WHILE THE SEDIMENT BASIN IS UTILIZED.
7. CUT AND FILL SLOPES SHALL BE DESIGNED AND CONSTRUCTED IN A MANNER
THAT WILL MINIMIZE EROSION. SLOPES THAT ARE FOUND TO BE ERODING
EXCESSIVELY WITHIN ONE YEAR OF PERMANENT STABILIZATION SHALL BE
PROVIDED WITH ADDITIONAL SLOPE STABILIZING MEASURES UNTIL THE
PROBLEM IS CORRECTED.THERE ARE NO PROPOSED CUT OR FILL SLOPES.
HOWEVER, THE CONTRACTOR IS TO RESTORE THE PROJECT AREA TO
EXISTING GRADE. IF THE AREAS WITH NATURALLY STEEP SLOPES ARE FOUND
TO BE ERODING EXCESSIVELY AFTER ONE YEAR, CONTRACTOR IS TO PROVIDE
ADDITIONAL SLOPE STABILIZING MEASURES UNTIL THE PROBLEM IS
CORRECTED.
8. CONCENTRATED RUNOFF SHALL NOT FLOW DOWN CUT OR FILL SLOPES
UNLESS CONTAINED WITHIN AN ADEQUATE TEMPORARY OR PERMANENT
CHANNEL, FLUME OR SLOPE DRAIN STRUCTURE.MAXIMIZE SHEETFLOW AND
GROUNDWATER INFILTRATION
9. WHENEVER WATER SEEPS FROM A SLOPE FACE ADEQUATE DRAINAGE OR
OTHER PROTECTION SHALL BE PROVIDED.CONTRACTOR TO NOTIFY ENGINEER
AND COUNTY EROSION CONTROL INSPECTOR.
10. ALL STORM SEWER INLETS THAT ARE MADE OPERABLE DURING
CONSTRUCTION SHALL BE PROTECTED SO THAT SEDIMENT -LADEN WATER
CANNOT ENTER THE CONVEYANCE SYSTEM WITHOUT FIRST BEING FILTERED
OR OTHERWISE TREATED TO REMOVE SEDIMENT.THERE ARE NO STORM SEWER
INLETS PROPOSED.
11. BEFORE NEWLY CONSTRUCTED STORMWATER CONVEYANCE CHANNELS OR
PIPES ARE MADE OPERATIONAL, ADEQUATE OUTLET PROTECTION AND ANY
REQUIRED TEMPORARY OR PERMANENT CHANNEL LINING SHALL BE INSTALLED
IN BOTH THE CONVEYANCE CHANNEL AND RECEIVING CHANNEL.THERE ARE
NO STORMWATER CONVEYANCE CHANNELS OR PIPES PROPOSED.
12. WHEN WORK IN A LIVE WATERCOURSE IS PERFORMED, PRECAUTIONS SHALL
BE TAKEN TO MINIMIZE ENCROACHMENT, CONTROL SEDIMENT TRANSPORT AND
STABILIZE THE WORK AREA TO THE GREATEST EXTENT POSSIBLE DURING
CONSTRUCTION. NON -ERODIBLE MATERIAL SHALL BE USED FOR THE
CONSTRUCTION OF CAUSEWAYS AND COFFERDAMS. EARTHEN FILL MAY BE
USED FOR THESE STRUCTURES IF ARMORED BY NON -ERODIBLE COVER
MATERIALS.CONTRACTOR SHALL FOLLOW THE VESCH CHAPTER 3.25 UTILITY
STREAM CROSSING REQUIREMENTS FOR THE TWO INTERMITTENT STREAM
CROSSINGS.
13. WHEN A LIVE WATERCOURSE MUST BE CROSSED BY CONSTRUCTION VEHICLES
MORE THAN TWICE IN ANY SIX-MONTH PERIOD, A TEMPORARY VEHICULAR
STREAM CROSSING CONSTRUCTED OF NON -ERODIBLE MATERIAL SHALL BE
PROVIDED. CONTRACTOR SHALL FOLLOW THE VESCH CHAPTER 3.25 UTILITY
STREAM CROSSING REQUIREMENTS FOR THE TWO INTERMITTENT STREAM
CROSSINGS.
14. ALL APPLICABLE FEDERAL, STATE AND LOCAL REQUIREMENTS PERTAINING TO
WORKING IN OR CROSSING LIVE WATERCOURSES SHALL BE MET.CONTRACTOR
SHALL FOLLOW FOLLOW ALL APPLICABLE FEDERAL, STATE AND LOCAL
REQUIREMENTS FOR THE TWO INTERMITTENT STREAM CROSSINGS.
15. THE BED AND BANKS OF A WATERCOURSE SHALL BE STABILIZED
IMMEDIATELY AFTER WORK IN THE WATERCOURSE IS COMPLETED. CON TRACTOR
SHALL FOLLOW THE VESCH CHAPTER 3.25 UTILITY STREAM CROSSING
REQUIREMENTS FOR THE TWO INTERMITTENT STREAM CROSSINGS.
16. UNDERGROUND UTILITY LINES SHALL BE INSTALLED IN ACCORDANCE WITH
THE FOLLOWING STANDARDS IN ADDITION TO OTHER APPLICABLE CRITERIA:
A. NO MORE THAN 500 LINEAR FEET OF TRENCH MAY BE OPENED AT ONE TIME.
B. EXCAVATED MATERIAL SHALL BE PLACED ON THE UPHILL SIDE OF TRENCHES.
C. EFFLUENT FROM DEWATERING OPERATIONS SHALL BE FILTERED OR PASSED
THROUGH AN APPROVED SEDIMENT TRAPPING DEVICE, OR BOTH, AND
DISCHARGED IN A MANNER THAT DOES NOT ADVERSELY AFFECT FLOWING
STREAMS OR OFF -SITE PROPERTY.
D. MATERIAL USED FOR BACKFILLING TRENCHES SHALL BE PROPERLY COMPACTED
IN ORDER TO MINIMIZE EROSION AND PROMOTE STABILIZATION.
E. RE -STABILIZATION SHALL BE ACCOMPLISHED IN ACCORDANCE WITH THIS
CHAPTER.
F. APPLICABLE SAFETY REQUIREMENTS SHALL BE COMPLIED WITH.CONTRACTOR TO
ADHERE TO THE APPLICABLE STANDARD FOR PRIVATE AND PUBLIC UTILITY
INSTALLATION.
17. WHERE CONSTRUCTION VEHICLE ACCESS ROUTES INTERSECT PAVED OR
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 PAVED OR PUBLIC ROAD SURFACE, THE
ROAD SURFACE SHALL BE CLEANED THOROUGHLY AT THE END OF EACH
DAY. SEDIMENT SHALL BE REMOVED FROM THE ROADS BY SHOVELING OR
SWEEPING AND TRANSPORTED TO A SEDIMENT CONTROL DISPOSAL AREA.
STREET WASHING SHALL BE ALLOWED ONLY AFTER SEDIMENT IS REMOVED IN
THIS MANNER. THIS PROVISION SHALL APPLY TO INDIVIDUAL DEVELOPMENT
LOTS AS WELL AS TO LARGER LAND -DISTURBING ACTIVITIES.CONTRACTOR
SHALL MAKE PROVISIONS TO KEEP ADJACENT ROADS CLEAN FROM SOIL
BUILD-UP.
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 VESCP AUTHORITY. TRAPPED SEDIMENT AND THE
DISTURBED SOIL AREAS RESULTING FROM THE DISPOSITION OF TEMPORARY
MEASURES SHALL BE PERMANENTLY STABILIZED TO PREVENT FURTHER
EROSION AND SEDI MEN TATION.CONTRACTOR SHALL STABILIZE SITE AND
OBTAIN INSPECTOR APPROVAL PRIOR TO REMOVING EC MEASURES. UPON
APPROVAL OF THE ENVIRONMENTAL INSPECTOR, INSTALL INFILTRATION AREAS
AND CONNECT ROOF DRAINS.
19. PROPERTIES AND WATERWAYS DOWNSTREAM FROM DEVELOPMENT SITES
SHALL BE PROTECTED FROM SEDIMENT DEPOSITION, EROSION AND DAMAGE
DUE TO INCREASES IN VOLUME, VELOCITY AND PEAK FLOW RATE OF
STORMWATER RUNOFF FOR THE STATED FREQUENCY STORM OF 24-HOUR
DURATION IN ACCORDANCE WITH THE FOLLOWING STANDARDS AND CRITERIA.
STREAM RESTORATION AND RELOCATION PROJECTS THAT INCORPORATE
NATURAL CHANNEL DESIGN CONCEPTS ARE NOT MAN-MADE CHANNELS AND
SHALL BE EXEMPT FROM ANY FLOW RATE CAPACITY AND VELOCITY
REQUIREMENTS FOR NATURAL OR MAN-MADE CHANNELS:THIS PROJECT DOES
NOT INCLUDE ANY ADDITIONAL IMPERVIOUS SURFACES AND THE PROJECT
AREA WILL BE RESTORED TO ITS EXISTING CONIDTIONS. THEREFORE WILL NOT
PRODUCE ANY ADDITIONAL STORMWATER RUNOFF.
A. CONCENTRATED STORMWATER RUNOFF LEAVING A DEVELOPMENT SITE SHALL
BE DISCHARGED DIRECTLY INTO AN ADEQUATE NATURAL OR MAN-MADE
RECEIVING CHANNEL, PIPE OR STORM SEWER SYSTEM. FOR THOSE SITES
WHERE RUNOFF IS DISCHARGED INTO A PIPE OR PIPE SYSTEM, DOWNSTREAM
STABILITY ANALYSES AT THE OUTFALL OF THE PIPE OR PIPE SYSTEM SHALL
BE PERFORMED.
B. ADEQUACY OF ALL CHANNELS AND PIPES SHALL BE VERIFIED USING THE
VSMP CHANNEL PROTECTION CRITERIA. STORMWATER DISCHARGES ARE
CLASSIFIED INTO ONE OF THREE TYPES OF CHANNEL.
(1) "MANMADE STORMWATER CONVEYANCE SYSTEM" MEANS A PIPE,
DITCH, VEGETATED SWALE, OR OTHER STORMWATER CONVEYANCE
SYSTEM CONSTRUCTED BY MAN EXCEPT FOR RESTORED STORMWATER
CONVEYANCE SYSTEMS OR,
(A)THE MANMADE STORMWATER CONVEYANCE SYSTEM SHALL CONVEY
THE POST -DEVELOPMENT PEAK FLOW RATE FROM THE TWO-YEAR
EVENT WITHOUT CAUSING EROSION OF THE SYSTEM DETENTION OF
THE STORMWATER OR DOWNSTREAM IMPROVEMENTS MAY BE
INCORPORATED INTO THE APPROVED LAND -DISTURBING ACTIVITY TO
MEET THIS CRITERIA AT THE DISCRETION OF THE STORMWATER
PROGRAM ADMINISTRATIVE AUTHORITY.
(B) THE PEAK DISCHARGE REQUIREMENTS FOR CONCENTRATED
STORMWATER FLOW TO NATURAL STORMWATER CONVEYANCE
SYSTEMS SHALL BE MET.
QDEVELOPED <= I.F. * (QPRE-DEV. * RVPRE-DEV.) /
RVDEVELOPED
UNDER NO CONDITION SHALL QDEVELOPED > Q PRE-DEV.
NOR SHALL QDEVELOPED BE REQUIRED TO BE LESS THAN THAT
QFOREST * RVPRE-DEV.)/RVDEVELOPED
OR IN ACCORDANCE WITH ANOTHER METHODOLOGY THAT IS
DEMONSTRATED BY THE VSMP AUTHORITY TO ACHIEVE EQUIVALENT
RESULTS AND IS APPROVED BY THE BOARD.
(2) "NATURAL STORMWATER CONVEYANCE SYSTEM" MEANS THE MAIN
CHANNEL OF A NATURAL STREAM AND THE FLOOD -PRONE AREA
ADJACENT TO THE MAIN CHANNEL OR,
(3) "RESTORED STORMWATER CONVEYANCE SYSTEM" MEANS A
STORMWATER CONVEYANCE SYSTEM THAT HAS BEEN DESIGNED AND
CONSTRUCTED USING NATURAL CHANNEL DESIGN CONCEPTS. RESTORED
STORMWATER CONVEYANCE SYSTEMS INCLUDE THE MAIN CHANNEL AND
THE FLOOD -PRONE AREA ADJACENT TO THE MAIN CHANNEL.
(A) THE DEVELOPMENT SHALL BE CONSISTENT, IN COMBINATION WITH
OTHER STORMWATER RUNOFF, WITH THE DESIGN PARAMETERS OF
THE RESTORED STORMWATER CONVEYANCE SYSTEM THAT IS
FUNCTIONING IN ACCORDANCE WITH THE DESIGN OBJECTIVES.
(B) THE PEAK DISCHARGE REQUIREMENTS FOR CONCENTRATED I
STORMWATER FLOW TO NATURAL STORMWATER CONVEYANCE
SYSTEMS SHALL BE MET. SEE 19 B 1 B .
GENERAL EROSION CONTROL NOTES
WORK AREA PROTECTION 8 MAINTENANCE
1. ALL FENCES REQUIRED TO BE REMOVED OR DISTURBED BY CONSTRUCTION SHALL BE SALVAGED,
STORED, PROTECTED AND RE -INSTALLED BY CONTRACTOR AT THE DIRECTION OF AND LOCATION
DESIGNATED BY THE PROJECT MANAGER. IF SUCH FENCE MATERIAL CANNOT BE REUSED DUE TO
DAMAGE CAUSED BY CONTRACTOR, CONTRACTOR SHALL INSTALL NEW FENCE OF THE SAME TYPE OF
MATERIAL. TEMPORARY FENCING REQUIRED BY PRIVATE PROPERTY OWNERS SHALL BE PROVIDED BY
CONTRACTOR. CONTRACTOR IS ADVISED TO CONTACT PROPERTY OWNERS AT LEAST FORTY-EIGHT
(48) HOURS IN ADVANCE OF REMOVING ANY FENCE IN ORDER TO COORDINATE RELOCATION AND/OR
PROTECTION OF ANY ANIMALS, AND TO ESTABLISH AND CONFIRM WITH THE OWNER THE
PRE -CONSTRUCTION CONDITION OF ANY FENCE TO BE REMOVED, DISTURBED OR REPLACED.
2. CONTRACTOR IS PERMITTED TO WORK IN THE PUBLIC RIGHT-OF-WAY (FOLLOWING ISSUANCE OF
VDOT APPROVAL) AND ANY TEMPORARY OR PERMANENT EASEMENT (FOLLOWING VERIFICATION OF
EXISTENCE OF EASEMENT) SHOWN ON THE PLANS. HOWEVER CONTRACTOR SHALL NOTIFY PROPERTY
OWNER(S) FORTY-EIGHT (48) HOURS PRIOR TO WORKING ON ANY PRIVATE PROPERTY TO GAIN AND
COORDINATE ACCESS AND TO DETERMINE A STORAGE AREA FOR MATERIALS IF NEEDED.
COORDINATION OF ACCESS TO PUBLIC RIGHT-OF-WAY AND STORAGE OF MATERIALS THEREON SHALL
BE COORDINATED WITH VDOT AND THE PROJECT MANAGER. CONTRACTORS FAILURE TO SO NOTIFY
AND COORDINATE WITH PROPERTY OWNERS AND/OR THE PROJECT MANAGER MAY RESULT IN
DELAYS.
3.CONTRACTOR SHALL, AT HIS EXPENSE, MAINTAIN THE WORK SITE IN A CLEAN AND ORDERLY
APPEARANCE AT ALL TIMES. ALL DEBRIS AND SURPLUS MATERIAL COLLECTED SHALL BE DISPOSED
OF OFF THE WORK SITE BY CONTRACTOR, AT HIS EXPENSE.
4.EXISTING LAWNS, TREES, SHRUBS, FENCES, UTILITIES, CULVERTS, WALLS, WALKS, DRIVEWAYS, POLES,
SIGNS, RIGHT-OF-WAY MONUMENTS, MAILBOXES AND THE LIKE SHALL BE PROTECTED FROM DAMAGE
DURING THE WORK. ANY DAMAGE CAUSED TO SUCH ITEMS SHALL BE REPAIRED OR REPLACED BY
CONTRACTOR AT NO ADDITIONAL COST. PROPERTY PINS DISTURBED BY CONTRACTOR THAT ARE NOT
SHOWN ON THE PLANS TO BE DISTURBED SHALL BE RESTORED BY A LICENSED SURVEYOR AT
CONTRACTORS EXPENSE.
& CONTRACTOR SHALL EMPLOY EROSION CONTROL DEVICES AND METHODS AS REQUIRED TO MEET THE
REQUIREMENTS AND INTENT OF THE LOCAL EROSION CONTROL ORDINANCE. CONTRACTOR SHALL
PROVIDE THE NECESSARY DIVERSION DITCHES, DIKES OR TEMPORARY CULVERTS REQUIRED TO
PREVENT MUD AND DEBRIS FROM BEING WASHED ONTO THE STREETS OR PROPERTY. CONTRACTORS
VEHICLES SHALL BE KEPT CLEAN TO PREVENT MUD OR DUST FROM BEING DEPOSITED ON STREETS.
NO AREA SHALL BE LEFT DENUDED FOR MORE THAN SEVEN (7) CALENDAR DAYS.
VEGETATION
1. PRIOR TO REMOVING ANY VEGETATION, CONTRACTOR SHALL MEET WITH THE PROPERTY OWNERS AND
THE PROJECT MANAGER TO REVIEW THE LIMITS OF CONSTRUCTION AND OBTAIN PERMISSION TO
REMOVE VEGETATION REQUIRED TO DO THE WORK.
2.TREE AND PLANT ROOTS OR BRANCHES THAT MAY INTERFERE WITH THE WORK SHALL BE TRIMMED
OR CUT ONLY WITH THE APPROVAL OF THE PROJECT MANAGER. ANY TREES OR PLANTS WHICH ARE
SHOWN TO REMAIN THAT DO NOT INTERFERE WITH THE WORK, BUT ARE DAMAGED BY CONTRACTOR
OR HIS SUBCONTRACTORS, SHALL BE REPAIRED OR REPLACED BY CONTRACTOR AT NO ADDITIONAL
COST.
3. CONTRACTOR SHALL CLEAN UP, RESTORE, SEED AND MAINTAIN ALL DISTURBED AREAS IMMEDIATELY
UPON COMPLETION OF WORK ON EACH SITE. TOPSOIL, SEED, FERTILIZER AND MULCH SHALL BE
PLACED IN ACCORDANCE WITH ESC AUTHORITY STANDARDS ON ALL DISTURBED AREAS. A
PERMANENT STAND OF GRASS ADEQUATE TO PREVENT EROSION SHALL BE ESTABLISHED PRIOR TO
FINAL ACCEPTANCE.
4. THE ACT OF RESEEDING SHALL NOT QUALIFY AS "STABILIZED". THE CONTRACTOR SHALL BE
RESPONSIBLE TO ESTABLISH VEGETATION, NOT SIMPLY APPLY SEED AND MATERIALS.
EROSION & SEDIMENT CONTROL LEGEND
S qF❑
�� SAFETY FENCL
O❑3.U1
OCE H
p CONSTRUCTION ENTRANCE
CONSTRUCTION ROAD
@AE PS
STABILIZATION
D3.05 )/� SILT FENCE
�/ FDIVERSION
O
SB 3.14 SB SEDIMENT BASIN
O❑ O
OQP H
o OUTLET PROTECTION
OSR 3.29 SR O SURFACE ROUGHENING
❑
OTS El
TSTEMPORARY SEEDING
E3.32PS PERMANENT SEEDING
❑
OTP F
TIP +P TREE PROTECTION
DC DUST CONTROL
O❑3.3g DC
A
.
M
r
U
a
7
m
p
w
r
U o
U
°'o
OZ
z c0(0 :::iY!� 2
-
rr^
-10 J
I-- 0) w 0) tU
<
vj
T
J =
OIr U ¢U) m
aZ =`)) <
0 ❑
W
O U) w
O
°< naIr
IE
JZ vU I
< 3:Z 0
0
>
() o
W o
=j
Cn
Z �
O Z 9
>
I�
Ir o v
o ¢ N
W
MM
N W
<� z
> O
J
U U W o_
u) � J
r V) >
V
O
a Z w
M
So
W J
14
U)Ir
c,=
rn U
REVISIONS
COUNTY COMMENTS
Feb 15, 2019
COUNTY COMMENTS
April 15, 2019
FOR APPROVAL
May 21, 2019
REV. MITIGATION
PLANTING AREAS
May 21, 2021
CONTOURS
2 FOOT
DATE
October 22, 2018
SCALE
NA
0p
pr*.
o{��AyTH
0 0�
U 97 /!/� y
Jimmy L. Taggart
Lic2. No. 4
t 05Z 214121 4�'
��&'4ZONAL 0�
O
O
O
1
I- 00
zo
WNW <
z
W a_
(D 3:J
04
Q N>
z z _j (Y) ;
z
o
2_j>Yz
JUO
E
OzWOQ
� fr fr J _1
ou
� z~m�
W
CD
CE�❑
0 J D_D
o
0 z 0 <
w
U)
O
Ir
06
FILE NUMBER
8053
SHEET
07 OF 14
__j
QARGA\TMPROJ\8053-OLD TRAIL\Block 32\ENGINEERINGIDWG\8053-OLD TRAIL- Block 32 - WPO.dwa
� cE CONSTRUCTION ENTRANCE
STONE
CONSTRUCTION
ACCESS -\
STONE
CONSTRUCTION
ACCESS -
70' MIN.
� 3" SM-2A ASPHALT TOP
COURSE
2%
`6" M:N, 21A AGGREGATE BASE
PROFILE
70' MIN.
--^^ %ASPHALT PAVED
/ WASHRACK
EXISTING
2% 2% PAVEMENT
2% 12' MIN.*
+ I
� t�POSITIVE DRAINAGE
-V
"MUST EXTEND FULL WIDTH TO SEDIMENT
OF INGRESS AND EGRESS + TRAPPING DEVICE
OPERATION
ELAN
12' MIN, POSITIVE DRAINAGE
29 TO SEDIMENT
TRAPPING DEVICE
FILTER CLOTH) _
SECTION A -A
A nvtvtumu water tap of 1 inch rnust be installed with a utininnmt 1 itch ballcock
shutoff vahre supplying a wash hose with a diameter of 1,5 itches for adequate
constant pressure. Wash water must be carried away from the entrance to an
approved settling area to remove sediment. All sediment shall be prevented fi-om
enterits storm drains, ditches or watercourses.
PAVED WASH RACK
NO SCA_F
sAF SAFETY FENCE
,SAFETY FENCE
PERSPECTIVE VIEW
PERSPECTIVE VIEW
PLASTIC FENCE
SOURCE: CONWED PLASTICS
VDOT ROAD AND BRIDGE STANDARDS
VA. DSWC
�v DIVERSION
PERSPECTIVE VIEW
METAL FENCE
DIVERSION
10% SETTLEMENT �.
0.3' FREE BOARD���'.��'
TYPICAL VEE-SHAPED DIVERSION
Source: Va. DSWC
PLATE. 3.1-1
Plate 3.12-1
TP TREE PROTECTION
FENCING AND ARMORING
DRIP LINE
SNOW FEN
BOARD FEI
CORRECT METHODS OF TREE FENCING
sF SILT FENCE
CONSTRUCTION OF A SILT FENCE
(WITHOUT WIRE SUPPORT)
1. SET THE STAKES. 2. EXCAVATE A 4"X 4" TRENCH
UPSLOPE ALONG THE LINE OF
STAKES.
6'MAX. /
I
FLOW r ®
3. STAPLE FILTER MATERIAL
TO STAKES AND EXTEND
IT INTO THE TRENCH.
ENCE
.a
CORRECT TRUNK ARMORING
TRIANGULAR BOARD FENCE
Source: Va. DSCW Plate 3.38-:
TEMPORARY SEEDING MIXTURES FOR
Ts THE PIEDMONT AREA
TABLE 26
TEMPORARY SEEDINGS BY RATES, DEPTHS, AND DATES
Seeding Rate
Planting
depth In
Seeding zones (Q and Seeding Date Q
Species (1)
Per
Lbs/1000
7a and 7b
6b
6a and 5b
acre
Sq.It
(Inches)
2/1-
5/1-
8/15-
3/1-
5/1-
8/15-
3/15-
6/1-
8/1-
4/30
8/14
11/30
4/30
8/14
11/15
5131
7/31
10/31
Choose one:
BY
BY
BY
Barley
2.5 bu.
2.80
1-2
X
-
10115
X
-
10/15
X
-
10/1
Oats
3 bu.
2.21
1-2
X
-
-
X
-
-
X
-
-
Rye (4)
2.5 bu.
3.22
1-2
X
-
X
X
-
X
X
-
X
a5'or
Rye lus
150 lbs.
3.45
1
X
X
10/15
X
X
10/15
X
X
10/1
Foxtail
X
X
X
X
X
X
X
X
X
millet 5
Weeping
4lbs.
0.09
1/4-1/2
-
X
-
-
X
-
-
X
-
lovegrass
Annual
ryegrasS
50 lbs.
1.15
1/4-1/2
X
-
11/1
X
-
11/1
X
-
8/15
Millet(7)
50 lbs.
1.15
1/2
-
X
-
-
X
-
-
X
-
(1) Applicable on slopes of 3:1 or flatter
(2) Refer to figure A - Adopted from USDA, ARS Miscellaneous Publication #1475, January 1990
(3) Between fall and spring seeding dates, use mulch only if ground is frozen and reseed when thawed
(4) May be used as a nurse crop for late fall/early winter permanent seedings, add 56 Ibs/ac. to the permanent
seeding mixture
(4) Maryland State Highway Administration Temporary Seed Mix
(5) May be used as a nurse crop for mid -summer permanent seedings. Add 2 Ibs/ac to permanent seed mix.
(6) May be used as a nurse crop for mid -summer permanent seedings. Add 10 Ibs/ac. to the permanent seeding
mix.
DOZER TREADS CREATE
GROOVES PERPENDICULAR
TO THE SLOPE.
q
5
. 9
4-
4. BACKFILL AND COMPACT
THE EXCAVATED SOIL.
SHEET FLOW INSTALLATION
(PERSPECTIVE VIEW)
SF/STONE NOT REQUIRED AFTER SLOPES ARE STABILIZED DOWNSLOPE OF OUTFALL
POINTS A SHOULD BE HIGHER THAN POINT B.
DRAINAGEWAY INSTALLATION
(FRONT ELEVATION)
SUGGESTED TEMPORARY SEEDING MIXTURE
FERTILIZER: 10-20-10: 1,000 LBS/ACRE
SEPTEMBER-FEBRUARY 15: 50% ANNUAL RYE & 50% WINTER RYE 100 LBS/ACRE
FEBRUARY 16-APRIL 30: ANNUAL RYE 100 LBS/ACRE MAY -AUGUST: GERMAN MILLET 50
LBS/ACRE OTHER OPTIONS EXIST, SEE VA EROSION AND SEDIMENT CONTROL HANDBOOK.
SUGGESTED PERMANENT SEEDING MIXTURE
LIME: 2 TONS/ACRE FERTILIZER: 10-20-10 1,000 LBS/ACRE
MARCH -MAY 15: KENTUCKY 31 FESCUE 200 LBS/ACRE, ANNUAL RYE 20 LBS/ACRE MAY
16-AUGUST 15: KENTUCKY 31 FESCUE 200 LBS/ACRE, FOXTAIL MILLET 20 LBS/ACRE
AUGUST 16-OCTOBER: KENTUCKY 31 FESCUE 200 LBS/ACRE, ANNUAL RYE 20 LBS/ACRE
NOVEMBER-FEBRUARY. KENTUCKY 31 FESCUE 200 LBS/ACRE, WINTER RYE 20 LBS/ACRE
EACH LIFT OF THE FILL IS COMPACTED, BUT THE OUTER FACE
OF THE SLOPE IS ALLOWED TO REMAIN LOOSE SO THAT THE
ROCKS, CLODS, ETC. REACH THE NATURAL ANGLE OF REPOSE.
FILL SLOPE TREA TMENT
SOURCE: MICHIGAN SOIL EROSION
AND SEDIMENTATION GUIDE
PLATE. 3.29-4 SOURCE: VA. DSWC
oP
OUTLET
PROTECTION
SPECIFICATIONS
PLATE. 3.29-3
OP: INTO EOFILTER
OP: INTO S1 POND
OP: INTO EX.POND
0 C. . L I RAP
24" MIN. DEPTH F24" PIPE
.0 C. . L I RAP
o 24" MIN. DEPTH F24" PIPE
3.0 .Y. C I R RAP
in 24" MIN. DEPTH F36" PIPE
UNDERLYING F.F cO 17 CFS
/UNDERLYING F.F 15 CFS
UNDERLYING F.F 25 CFS
APRON LENGTH = 10'
APRON LENGTH = 10'
APRON LENGTH = 15'
PERMANENT SEEDING MIXTURES FOR
DPS THE PIEDMONT AREA
TABLE 25 TOTAL LBS. PER ACRE
MINIMUM CARE LAWN - COMMERCIAL OR RESIDENTIAL 175-200 LBS.
- KENTUCKY 31 OR TURF -TYPE TALL FESCUE 95-100%
- IMPROVED PERENNIAL RYE GRASS 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.
LOW -MAINTENANCE SLOPE (STEEPER THAN 3:1)
- KENTUCKY 31 FESCUE 108 LBS.
- RED TOP GRASS 2 LBS.
SEASONAL NURSE CROP* 20 LBS.
CROWN VETCH** 20 LBS.
TOTAL 150 LBS.
*USE SEASONAL NURSE CROP IN ACCORDANCE WITH SEEDING DATES AS STATED
BELOW:
FEBRUARY 16TH THROUGH APRIL 30TH............ ANNUAL RYE
MAY 1ST THROUGH AUGUST 15TH ................ FOXTAIL MILLET
AUGUST 16TH THROUGH OCTOBER 31ST........... ANNUAL RYE
NOVEMBER 1ST THROUGH FEBRUARY 15TH ........ANNUAL 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 INNOCULATED.
WEEPING LOVEGRASS MAY BE ADDED TO ANY SLOPE OR LOW MAINTENANCE MIX
DURING WARMER SEEDING PERIODS; ADD 10- 20 LBS./ACRE IN MIXES.
OPs PERMANENT SEEDING FERTILIZATION
AND MAINTENANCE
TABLE 24
Maintenance Fertilization for Permanent Seedlings
Use Soil Test Recommendation or Rates Shown Below
Seeding Mixture
Formulation
Lbs. per
Lbs. per
Time
Mowing
Acre
1000 sf
Tall fescue makes
10-10-10
500
11.5
Yearly, or as
*Not closer than 3" if
up 70% or more
or
400
9.2
needed fall
occasional mowing is
of cover.
30-10-10
desired.
Crownvetch
Spring the year
Do not mow crownvetch
Service lespedeza
0-20-0
400
9.2
following
g
establishment
Birdsfoot trefoil
and every 4-5
years thereafter.
Fairly uniform
Fall the year
Not required. not closer
stand of Tall
following
than 4" if occasional
Tescue & Service
5-10-10
500
11.5
establish- ment
mowing is desired, and
lespedeza, or
and every 4-5
then in fall after seed
Birdsfoot Trefoil.
years thereafter.
has matured.
Weeping
Spring the year
Not required. not closer
Lovegrass &
following
than 4" if occasional
Service lespedeza
5-10-10
500
11.5
establishment
mowing is desired, and
fairly uniform plant
and every 3-4
fall after sericea has
distribution
years thereafter.
matured.
Red & chewin s
g
20-10-10
250
5.8
September, 30
Mow no closer than 2"
for red fescue and Ky
fescue, Kentucky
days later
December, May
bluegrass; and closer
bluegrass, hard
20-10-10
100
2.3
20-June-30, if
than 3" for fescue.
fescue mixture:
needed.
NYLOPLAST 18" DRAIN BASIN: 2818AG X
(1, 2) INTEGRATED DUCTILE IRON
FRAME & GRATE TO MATCH BASIN O.D.
MINIMUM PIPE BURIAL
DEPTH PER PIPE
(3) VARIABLE INVERT HEIGHTS
MANUFACTURER
AVAILABLE (ACCORDING TO
RECOMMENDATION
PLANSITAKE OFF)
(MIN. MANUFACTURING
REQ. SAME AS MIN. SUMP)
(4) VARIOUS TYPES OF INLET & OUTLET ADAPTERS AVAILABLE:
4" -18" FOR CORRUGATED HDPE (ADS N-12IHANCOR DUAL WALL,
ADSMANCOR SINGLE WALL), N-12 HP, PVC SEWER (EX: SDR 35),
PVC DWV (EX SCH 40), PVC C900/C905, CORRUGATED & RIBBED PVC
WATERTIGHT JOINT
(CORRUGATED HDPE SHOWN)
\�a
18" MIN WIDTH GUIDELINE
8" MIN THICKNESS GUIDELINE
(5) ADAPTER
ANGLES
TRAFFIC LOADS: CONCRETE SLAB DIMENSIONS ARE FOR
ARIABLE 0° -360°
GUIDELINE PURPOSES ONLY. ACTUAL CONCRETE SLAB MUST BE
ACCORDING TO
DESIGNED TAKING INTO CONSIDERATION LOCAL SOIL CONDITIONS,
L��,
PLANS
TRAFFIC LOADING, & OTHER APPLICABLE DESIGN FACTORS.
\N
SEE DRAWING NO.7001-110-111 FOR NON TRAFFIC INSTALLATION.
(3) VARIABLE SUMP DEPTH
ACCORDING TO PLANS
(6"MIN. BASED ON
MANUFACTURING REQ.)
4 MIN
THE BACKFILL MATERIAL SHALL BE CRUSHED STONE OR OTHER
GRANULAR MATERIAL MEETING THE REQUIREMENTS OF CLASS I,
CLASS II, OR CLASS III MATERIAL AS DEFINED IN ASTM D2321.
BEDDING & BACKFILL FOR SURFACE DRAINAGE INLETS SHALL BE
PLACED & COMPACTED UNIFORMLY IN ACCORDANCE WITH ASTM D2321.
GRATESISOLID COVER SHALL BE DUCTILE IRON PER ASTM A536 GRADE 7050-05.
THIS PRINT DISCLOSES SUBJECT MATTER IN WHICH
DRAWN BY EBC
MATERIAL
3130 VERONA AVE
FRAMES SHALL BE DUCTILE IRON PER ASTM A536 GRADE 70-50-05.
NYLOPLAST HAS PROPRIETARY RIGHTS. THE RECEIPT
BUFORD, GA 30518
DRAIN BASIN TO BE CUSTOM MANUFACTURED ACCORDING TO PLAN DETAILS.
OR POSSESSION OF THIS PRINT DOES NOT CONFER,
DATE 04.03.06
PHN (770) 932.2443
RISERS ARE NEEDED FOR BASINS OVER 84' DUE TO SHIPPING RESTRICTIONS.
SEE DRAWING NO.
TRANSFER, OR LICENSE THE USE OF THE DESIGN OR
; y last° FAX (770) 932-2490
REVISED BY NMH
PROJECT NO.MAME
STU65.
DRAINAGE CONNECTION STUB JOINT TIGHTNESS SHALL CONFORM TO
CONNECTION
TECHNICAL INFORMATION SHOWN HEREIN
,J w .n Ioplast-us.00n
y
TRUE
ASTM D3212 FOR CORRUGATED HOPE (ADS N-121HANCOR DUAL WALL),
REPRODUCTION OF THIS PRINT OR ANY INFORMATION
N-12 HP, & PVC SEWER.
CONTAINED HEREIN, OR MANUFACTURE OF ANY
DATE 0344.16
is IN DRAIN BASIN QUICK SPEC INSTALLATION DETAIL
ADAPTERS CAN BE MOUNTED ON ANY ANGLE 0° TO 360°. TO DETERMINE MINIMUM
ARTICLE HEREFROM, FOR THE DISCLOSURE TO OTHERS
ANGLE BETWEEN ADAPTERS SEE DRAWING NO. 7001-110-012.
IS FORBIDDEN, EXCEPT BY SPECIFIC WRITTEN
DWG SIZE A
SCALE 1:30 SHEET 1 OF 1
DWG N0. 7001-110.191 REV E
PERMISSION FROM NYLOPLAST. ®zoia uvmrusr
�I
J
r
U
7
m
p
w
U
°
O
Z Z U)
0ID �Y� 2
11
- toJ
HO) maw 0
Q
�t
T
J =
O U ¢ m
(L Z =w a
¢o
W
Ow 0
Ir °
°a �aIE
J Z v U
ZIr 3:¢_
i
�j
0) o
W o
D) ('3
Fil
n
r o v
I
D- Lu N v
N W
Q z
> O
IE
va w a
J
} V >
=Zw
Oaz
•,/
Fit
C) o
w
Ua
rn U
REVISIONS
COUNTY COMMENTS
Feb 15, 2019
COUNTY COMMENTS
April 15, 2019
FOR APPROVAL
May 21, 2019
REV. MITIGATION
PLANTING AREAS
May 21, 2021
CONTOURS
2 FOOT
DATE
October 22, 2018
SCALE
NA
0p
pr��
�o{��AyTH
Jimmy L. Taggart
Lic. No.
2 4
AAo 05Z 214121 4��
��ssrONAL B�Gl
O
o
O
O
00
zo
Q
W N W Q
Q
a
O
r-
o
Q J N>
a
Z z J (y) ;
H
JUo
E
� J -
0
Q
W W
m
> Z
W
O W
E
0 J Q
z
0 Z 0
a
�0
x
Wco
z
0
0
W
o
0
O
W
FILE NUMBER
8053
SHEET
08 OF 14
CIARGA\TMPROA8053-OLD TRAIL\Block 32\ENGINEERINGIDWG\8053-OLD TRAIL- Block 32 - WPO.dwa
8-1
EXISTING RETENTION FACILITY
VA DCR
SWPP
EFF = ( RR+L ca ) x 100 (Equation5-22)
Performance
Based Water Quality Calculation Procedure
where: EFF = required pollutant removal efficiency
Project:
OTV-Block 32 WP0201800010 (Biofilter & Extended Detention)
RR = pollutant removal requirement (pounds per year)
Locality
Albemarle Co.
_
I'm - relative post -development total phosphorous load, Equation 5-21 (pounds per year)
Date:
212212019 9:33
Worksheet No. 1
EFF = 1.60 / 5.08 x 100-- 32%
Step t
Determine the applicable area A and the ostdevelo� impervious cover ([post).
Applicable area (A) = 342381.E s.f. or 7.880 acres
_2. Select 13111 from Table 5-14 and locate on the site:
Drainage Impervious
Post -development impervious cover.
T Efficient Area (s.f.) Area (s.f.) Descriodom
structures = 41579.2869 s.f. or 0.955 acres
_
B1: Reterlfion 65 342381.6 88786.96 BNP A
MP
parking lot = _ s.f. or 0.000 acres
roadway = 2B524.1542 s.f. or 0.655 acres
3. Determine the pollutant load entering the proposed BMP)
driveways & swlk = 1OW3.5231 s.f. or 0.429 acres
s.f. or 0.000 acres
]I = [0.05 + 0.009 x x AP wPBMx 2.28 (Equation 5-23 )
s.f. or 0.000 acres
T
where: Lamp = relative post -development total phosphorous load entering proposed BMP (pounds per yam)
Total = 88786.9642 s.f. or 2.038 acres
_
IBMP = post -development percent impervious cover to proposed BMP (percent expressed in whole numbers)
409 - (total post -development impervious cover =A) x 100 = 26%a
Ap cp6MP = drainage area to proposed BMP (acres)
Step 2
Determine the average land cover condition (I„7ternw) or the existing impervious rover (Iomoeg•
Lras i = [0.05 + (0.009 x 26% )] x 7.86 x 2.28
= 5.08 pounds per year
Average land cover condition (I.-h.a):
If the locality has determined land cover conditions for individual watersheds within its
4. Calculate the pollutant load removed by the proposed BNIP(s):
jurisdiction, use the watershed specific value determined by the locality as Iwatershed.
Iaatershm 0%
Lreawwd = Elf9MP x L11Mp (Equation 5-24)
Otherwise, use the Chesapeake Bay default value:
Iaatarshm 16%
where: L..mor.a kpost-developmem total phosphorous load removed by proposed BMP (pounds per year)
EABMP - pollutant removal efficiency of BMP (expressed in decimal form)
Iwteri 16%
Law - relative post -development total phosphorous load entering proposed BMP, Equation 5-23 (pounds per year)
Existing ittiperviors cover (I.- .,): Lrasea,,,i 3.30 Pounds per year removed
Determine the existing impervious cover of the development site if present
_ 5. Calculate the total pollutant load removed by the BMP(s):
Pre -development impervious cover:
structures = s.f. or 0.000 acres L,ema.uvwtar = LawovedlEri + L„n,ev,yBMP2+ Lswrxvi l aMPa ... (Equation 5-25)
parking lot = _ s.f. or 0.000 acres
roadway = s.f. or 0.000 acres where: L--- _..a =total pollutant load removed by proposed BMPs (pounds per year)
other s.f. or 0.000 acres
Concrete s.f. or 0.000 acres hmnvaaamiq = pollutant load removed by proposed BMP No. 1, Equation 5-24
s.f. or 0.000 acres
LnemovedBMPz = pollutant load removed by proposed BMP No. 2, Equation 5-24
Total 0 s.f. or 0.000 acres Lreenvea/sMr3 = 'pollutant load removed by proposed BMP No. 3, Equation 5-24
=
Lremmmtaral
Ie,;,tms = (total existing impervious cover + A) x 100 = 0% - 3.30 Total Pounds per year removed
_ • The area should be the same as used in STEP 1. 6. Verify compliance: I.rea,aeataml >_ RR
Lsc.vm/wt9 = 3.30 Total Pounds per year removed
Step 3 Determineati _ the appropriate development situon _ Req'd Removal- 1.60 Total Pounds per year removed
OK, Removal Rate Exceeded
The site information determined in STEP 1 and STEP 2 provide enough information to determine the appropriate
development situation under which the performance criteria will apply. Check ( ) the appropriate development situation as follows:
Nn Situation 1: This consists of land development where the existing percent impervvious cover (Ted,t.i is less than or S-13 BIOFILTER & EXTENDED DETENTION FACILTY
equal to the average land cover coalition (Iwatershed) and the proposed improvements will create a total percent VA DCR SWPP
impervious cover Tpost) which is less than or equal to the avera a land cover condition (Iwatershed).
False 1poat 26% <Iaaw„nee 1s% Performance Based Water Quality Calculation Procedure
Project OTV-Block 32 WP0201800010 (Biofilter & Extended Detention)
Yes Situation 2: This consists of land development where the existing percent impervious cover (Ie,a,rv,8) is less than or equal Locality Albemarle Co.
to the average land cover condition (Iwatershed) and the proposed improvements will create a total percent Date. 2/22/2019 9:28
_ impervious cover Tpost) which is eater than the aveT
over condition ([watershed). Worksheet No. 1
True Ieahang 0°6 <- Imawr,nea Sten 1 Determine the applicable area and the post-develoed im ervious cover (Ipost).
and Applicable area (A) = 4521521 s.f. or I 10.380 [acres
True Ipaw 26e/6 lama„hea
Post -development impervious cover:
No Situation 3: This consists of land development where the existing percent impervious cover (lm ir.) is greater than structures = s.f. or 0.000 acres
the average land cover condition Iwatershed). parking lot = 239580 s.f. or 5.500 acres
False Ia,asenq 0% > laater,haa 16% roadway = s.f. or 0.000 acres
other s.f. or 0.000 acres
[Sp Situation 4: This consists of lam development where the existing percent impervious cover (lass") is served by an s.f. or 0.000 acress.f. or 0.000 acres
existing stormwater management BMP(s) that addresses water quality.
If the proposed development meets the criteria for development Situation 1, Total = 239580 s.f. or 5.500 acres
than the low density development is considered to be the BMP and no pollutant removal is required.
The calculation procedure for Situation 1 stops here. If the proposed development meets the criteria for development Ipn,t = (toil post -development impervious cover =A) x I00 =
Situations 2, 3, or 4, then proceed to STEP 4 on the appropriate worksheet. St 2 Determine the averse land cover condition lna r or the existing impervious cover
� g ( ea) ting � P (1al,dag)•
VA DCR SWPP Average land cover condition (I-s-h.d):
Performance Based Water Quality Calculation Procedure SITUATION2
True I-mus, 1 n% s I,,,p„sea 19% If the locality has determined land cover conditions for individual watersheds within its
Project: ON-BlockM WPO201800010(61o0Ker&Extended Daemon) am jurisdiction, use the watershed specific value determined bythe locality as [watershed.
Locality: abemarle Co. True Ir .. 7 26% >I..re,.e,a 16% lastcri 0%
Date: 22-Feb-19
StuapenWarkahead Ni•n Wt rk•h LWyhS v5ii •nwvvkek W 2uY ��2 Otherwise, use the Chesapeake Bay default value:
SnnATION3 Iwatenhed 16%
Swwnwy cl Silumtion 2 criteria: from calculation procedue STEP l it. STEP 3 Workaheet 1: False La.ars 0% > I„,a,m„a 18% I
Area= 7.88 ac.
I,a, 26% I - 16%
1,effiasred= 1@b
I exietvg= OeA
ova eanaa-
Existing impervious cover
Determine the existing impervious cover of the deveIopmeite if present.
Ste" Determine the relative pro-developmert pollutant load au).
Based on Existing Impervious C°+ar Pre -development impervious cover:
SnnATION 4
False L..a,s
BMP
CURRENTLY IN
PLACE
NO
VA DCR SWPP
Performance Based Water Quality Calculation Procedure
Project ON -Block 32 W PO201900010 (Bioriaer & Extended Detention)
Locality. Alhemarle Co.
Date: 22-Feb-19
Situation WorksEaat No.2
Sunarmry of Situation 2 criteria: f era calculation procedure STEP 1 Lau STEP 3 Worle beet 1:
Ares 1038 ac.
[post- 53%
I ws[eai 16%
I eeawni, 0%
SITUAn0N 2
True 1-., 0% Lars... 16%
and
True I,m, m >I..Qa„a 16%
s UrIa
False lla,ass as; > 1.. a, , I16%
SDUADON4
False lea a,e
BMP
CURRENTLVIN
PLACE?
NO
Ste. 4 ➢et ursine the relative pre-develvpmert p°ll°tard lead (1i
Based on Existing In senlc,s Cower
ILega,ma [005+(0009xIa•,„,)]xAx2.28 (Equation9-16)
where: Lvaas.mil relative pre-develepmer¢ towl phosphorous load (pounds per year)
Iasi E,wtiag At mpervm,s cover nerrm, or,anea h mirA am,hem)
A - applicable area (acres)
LPK®motl=[0.05+(0,009x 0% )I x 10.38 x2.28
1.18 pounds per year
2 LFK m - [0.05+(0.009 x I„.,,,i„a)] x Ax 2.28 (Equation sl6)
where: Lv„t ,k,d) relative pre-developrrerk wtal phosphorous load (pounds per year)
I.du.hed = av,rexa hid owe orndtiou fwsce wahrehedahrwae Cheaew' Eay d� avab,. c£ld%(p,umecpesaadn vbak mmbem)
A = applicable area(aaes)
1,rgr,a.."-[0.05+((I 16% )I x 10.38 x2.28
4.59 pounds per year
Step 5 Determine the relattva pent-developmerd poll°tard load O,m,J.
Ls,=[0.05+(0.009xi, )]sA,229 (Equation 5-21)
relative post -development total phosphorous load (pow ds per year)
1P� post -development impervious cover (percent expressed in whole rnwibers)
A = eppboablc won (wres)
Lrs,=[0.05+(0.009x 53% )l x 10,38 x2.28
= 12.47 ponds per year
Stan 6 Determine the relative pollutant revava] regvnenreat (RR).
RR= Lsa-(o 9 xlvafsausa
RR = 12,5 - 1.1
RII itpounds per year
or
RR = L,,, -L,a,k.a,or,m
RR = 12.5 - 4.6
RR= 7.88 pounds per year
Use RR-7.89 (lesser vane)
stem [ Iderdtfy beat manageme st practice (BMP) forthe site.
1. Defermire tics requrired poBudant removal efficiency for fine site:
EFF = (RR= Ln,„ ) x 100 (Equation 5-22)
where: fEFF = required polhdantremoval efficiency
RR = pollatart removal requirement (pounds par year)
I,,,, relative post-developmertnetalphospborom load, Equation5-2I(pounds payear)
EFF = T 88 / 72.47 x 100= 63%
2. 9e]eotBMP(s) from Table 5-14 and lacetc on Hue site:
Drainage Impermous
Type Efficiency Area(a.f) Arar(af.)De.npfien:
BMP 1:
BMP 2:
BMP 3:
BMP 4:
BMP 5:
BMP A
BMP B
BMP C
BMP D
BMP E
3. Determine this pollute[ load entering the proposed BMP(s):
Lear _ [0.05+(01009 x Iay,E)] x A. x 2.28 (Equation 5-23)
wlere: L. ' relative post -development total phosphorous load entering proposed BMP (pounds per year)
Iase, = post -development percent impervious ewer to proposed BMP (percent expressed in whole rumbas)
A,wap - drainage area to proposed BMP (acres)
Lasser - [0.05 + (0.009 x 70% )l x 3.61 x2.28
&M ponds per year
Lear, =[0.05+(OAO9x 81% )l x 6.77 x2.28
12 O6 pounds per year
]Lawe,=[0.05+OMs)X 0% )l x 0.00 x2.28
OAO ponds per year
Lassos =[0.05+(0.009x 0% )l x am x2,28
am, ponds per year
Losses =[0.05+(0.009x 0% )l x 0DO x228
aw ponds per year
4. Calculate fine pollutant load removed bytke proposed Bled ):
4- Effwav x L. (Equation 5-24)
where Leman= post-developnead total phosphorous load removed by proposed BMP pounds par year)
Efli- pollutant remrval e➢icierey o£BMP(expressed in deccimalf )
Lase = relative post-developoeut fowl phosphorous load entering proposed BMP, Equaticri (pounds per }car)
Lr,m ,sn 5.02 Pounds per year recrossed
L ss ass we 3.01 Pounds per year retuned
L,_sa. 0.00 Pounds per year remosed
Lrmween 0.00 Pounds per year remo ed
11 000 Pountls per year retuned
11.a,,,mn,mw-[005+(0.009xlw,.,)]x Ax228 (Equation Sl6)
structures = s.f. or 0.000 acres
wire: iq,e,soon,r=reinvepre-developme 1phosplomlmd(potadsperyear)
parking lot- s.f. or 0.000 acres
S.Calculate thetotal pollWaid load removed by the BMP(s):
roadway - s.f. or 0.000 acres
Ev,taera lmprsviomrova(pmrem exmemed n w* ash.)
other s.f. or 0.000 acres
L.�uaae.M = L..,uerwr+L,•m,.,aarrer+7.,®„yn„�+... (Egvatiov 5-25)
A = applicable area (acres)
Coni s.f. or 0.000 acres
where: L„mo..ao,e• total pollutant loodremoved by proposed BMPs(pounds per yew)
Le,Crs o,c=[0.05+(0.009x as )l x 7.86 x2.28
s.f. or 0.000 acres
= 0.90 ponds per year
_
I,®namws = pollutant load removed by proposed BMP No. 1, Equation 5-24
2 Lr,.,,.a,.n,m = [0.05+(0.009 x I..-,, e)] x A x 2.28 (Eguatiov 5-16)
Total = 0 s.f. or 0.000 acres
L.,,,,cravr = pollute m lead re ved by prWosed BMP No. 2, Equation 5-24
L--..- pollutm load removed by proposed BMP No. 3, Equation 5-24
where: Iy„ ,,.,,„n.e) relative pre-developn snt total phosphor. load (ponds per year)
lade, - (total existing impervious cover - A) x 100 = 0%
L,ss_4,.,, 8.04 7Total Pounds
l.uersnea - mxmge ima cover covewm re spec'ecw.meseaor breay ormecae.aa.ke Eev eermmvom otre.s (pereea e,ae.aeehwwe m,wnsl
par year removatl
applicable ea(arrea)
* The area should be the same as used in STEP 1.
6. Verify compliance: L,a•„.>- tut
Lr,p,,,,,,,km=[0.05+(0.009x 116% )I x 7.86 x2.28
Lmm„eroei= 8.D4 Total Pounds per year removed
ponds per year
Step 3
Determine the appropriate development situation
Read RwroI 7.88 Total Pounds per year removed
OK, Removal Rate Exceeded
Step-5 Determine the relative post-aevelopa,ent pollutant load (L, I).
The site information determined in STEP 1 and STEP 2 provide enough information to determine the appropriate
L,.,t-[0.05[0.05+(O.o09 (Equation5-21)development
situation under which the performance criteria will apply. Check(_) the appropriate development situation asfollows:
EXTENDED DETENTION
where: I,o.t - relative poet-developmentrowl phosphorous load (pounds Per year)
No
Situation 1: This consists of land development where the existing percent impervious cover (Iersting) is less than or
•
MEASURE SEDIMENT ACCUMULATION LEVELS IN FOREBAY.
;.a = post-developne nTgm rvious cmu (p.c. expressed inwholemubas)
A = applicablearea(acres)
equal to the avenge land cover condition ([watershed) and the proposed improvements will create a total percent
MONITOR THE GROWTH OF WETLANDS, TREES AND SHRUBS PLANTED.
impervious cover ([post) which is less than or equal to the avers, a ]and cover condition (Iwatershed).
RECORD THE SPECIES AND THEIR APPROXIMATE COVERAGE, AND NOTE
Lvwt [0.05+(0.009x 26% )1 x 7.86 x2.28
I
False Ipos1 53% `clvwershetl 16%
THE PRESENCE OF ANY INVASIVE PLANT SPECIES.
poach p.year,
•
INSPECT THE CONDITION OF STORMWATER INLETS TO THE POND FOR
Si Determine use relative pollsters: remained requirement (RR).
Yes
Situation 2: This consists of land development where the existing percent impervious cover (Isciatirg) is less than or equal
MATERIAL DAMAGE, EROSION OR UNDERCUTTING.
to the average land cover condition (Iwaterslwd) and the proposed improvements will create a total percent
•
INSPECT THE BANKS OF UPSTREAM AND DOWNSTREAM CHANNELS FOR
RR = L„„- (o.9 L,-(seeose
RR 5.1 08
impervious cover (Trost) which is eater than the avers a land cover condition (Iwatershed).
EVIDENCE OF SLOUGHING, ANIMAL BURROWS, BOGGY AREAS, WOODY
RR- 4.27 pounds
True Ieds6as 0% <_ Iaatersnea 16%
GROWTH, OR GULLY EROSION THAT MAY UNDERMINE EMBANKMENT
or
_ -
and
INTEGRITY.
�= Isom- Ivace,rs,n.at
RR = 5.1 - 3.5
-
True Ipa,t 53% > Iaater,hea 16%
•
INSPECT POND OUTFACE CHANNEL FOR EROSION, UNDERCUTTING,
RR= 1.60 powdsper,ai
I
RIP -RAP DISPLACEMENT, WOODY GROWTH, ETC.
No
Situation 3: This consists of land development where the existing percent impervious cover II is greater than
•
INSPECT CONDITION OF PRINCIPAL SPILLWAY AND RISER FOR
Uae RR= 1.60 less. value)
the average land cover condition Iwatershed).
EVIDENCE OF SPALLING, JOINT FAILURE, LEAKAGE, CORROSION, ETC.
Sims Identify best waraesm ad practice (BMP) forthe site.
False lemd. 0% > lesawsh st 16%
•
INSPECT CONDITION OF ALL 'TRASH RACKS, REVERSE SLOPED PIPES OR
I. Determim the ream d polntant removal of icienoyfor tho site
FLASHBOARD RISERS FOR EVIDENCE OF CLOGGING, LEAKAGE, DEBRIS
Situation 4: This consists of land development where the existing percent im,tms) pervious cover (Iedis served by an
ACCUMULATION, ETC.
EFF - (RR +Lp,,,) x too (Bgmtiems-zz)
existing stormwater management BMP(s) that addresses water quality.
•
INSPECT MAINTENANCE ACCESS TO ENSURE IT IS FREE OF WOODY
where: EFF requiredpolluCarkrerrxrval efficieroy
VEGETATION, AND CHECK TO SEE WHETHER VALVES, MANHOLES AND
RR = pollumatremwal owurca'ent(pounds par year)
If the proposed development meets the criteria for development Situation 1,
LOCKS CAN BE OPENED AND OPERATED.
Leo„ = relative post-developoentrotal phosphorous lead, Egmtion5-21 (ppinde paryrer)
than the low density develo ment is considered to be the BMP and no ollutant removal is re4 uired
•
INSPECT INTERNAL AND EXTERNAL SIDE SLOPES OF THE POND FOR
P P
The calculation procedure for Situation 1 stops here. If the proposed development meets the criteria for development EVIDENCE OF SPARSE VEGETATIVE COVER, EROSION, OR SLUMPING,
Situations 2, 3, or 4, then proceed to STEP 4 on the appropriate worksheet. AND MAKE NEEDED REPAIRS IMMEDIATELY.
aul.r +Doer.
k s
1
1 a,_J
4L
y
- �
- - aIL4r iifYF
iW[Itr
illtl4 •'r•" - -
ic
z 3
a
ffi as .w
.11111. AL
- aftiller. yIl✓-Illaiiii-,.
.:
_ sera
1 J
i
1
t
iYL m
=,-
4,lilha
_ ;ram
_ allYlk
ass Jlla
JL
Jil.
r.96
ININFED INORIETUMON Il3A%N
TLWOOVM
CCMENMTM
rADDITUCOM
1IlI...
r5rirsiI A E Td
_
ADDITIONAL
POT11DI -
WNCENMTED Ai
INFLOWANIM - ' EETENT1i:. P. GC
PRE[IREATME[1' T _
-STAEIWZM LINIFLIf r
_.... ( -
DEATAL FOR OPTION&)
FNL;INU
AF1EA
gg;ACE Ai
`AU1LQP1LAYER
-. 1-III .•; d
1 111 � f -- -
�-ICI-I I-11 11 1 I
31 I 1 I -I I -I I1� � }
�Rl -I I -
ALL UNDERDFLAINS T() BE
IDATLIIfiIFITELI
SEC IION VIEW
LEVEL 1 NIIN. = 24'
1_FVFIL _ .11'I -itl
Ili I �
]TILii1�1_-
STONE SUMP
(OPEN GRADED)
Figure 9.5. Typical Detail of Bioretention with Additional Surface Ponding
GRASSED
PRETREATMENT
FILTER STRIP
SHEET FLOW OR
PRETREATMENT
FILTRATION
-------- 4►
BIORETENTION CE'_L
CONCENTRATED
FLOW WITH FOREBAY
2
PLAN VIEW
LEVEL 1
OR LEVEL 2 CONTROLLED
OVERFLOW
SECTION VIEW
BIORETENTION IN SHELF OF EXTENDE
EXTENDED
DETENTION
STORAGE
"'L
STONE SLOPE PROTECTION OR EQUAL
FULL EXTENDED
DETENTION STORAGE
1•I
Figure 9.6. Typical Detail of a Bioretention Basin within the Upper Shelf of an ED Pond
ANNUAL BMP MAINTENANCE REOUIREMENTS
BIORETENTION
• MOWING OF GRASS FILTER STRIPS AND BIORETENTION TURF COVER AT LEAST 4 TIMES A YEAR
• SPOT WEEDING, EROSION REPAIR, TRASH REMOVAL, AND MULCH RAKING TWICE DURING GROWING SEASON
• ADD REINFORCEMENT PLANTING TO MAINTAIN DESIRED THE VEGETATION DENSITY AS NEEDED
• REMOVE INVASIVE PLANTS USING RECOMMENDED CONTROL METHODS AS NEEDED
• STABILIZE THE CONTRIBUTING DRAINAGE AREA TO PREVENT EROSION AS NEEDED
• SPRING INSPECTION AND CLEANUP
• SUPPLEMENT MULCH TO MAINTAIN A 3 INCH LAYER
• PRUNE TREES AND SHRUBS
• REMOVE SEDIMENT IN PRE-TREATMENT CELLS AND INFLOW POINTSONCE EVERY 2 TO 3 YEARS
• REPLACE THE MULCH LAYER EVERY 3 YEARS
A
•
rn
r
U
7
m
p
w
Go
n O
Uon
Ny
OZ
z co
Oto �Y< 2
J
H0) Maui C)
(L
T J =
OU GU) m
aZ =w Q
W
O� wo 0
0
OQ �IE Er
IE
U
IL
i
to O
W o
Fit
En0
Z
Z rn
i p V
d W N V
/
"Ix`rl`.r'y4'
N w
Q > Z
O
vain a
Co J
rn >
=Zw
0
az
j L(
C) 0
w
Q
eo a
C)
=
rn U
REVISIONS
COUNTY COMMENTS
Feb 15, 2019
COUNTY COMMENTS
April 15, 2019
FOR APPROVAL
May 21, 2019
REV. MITIGATION
PLANTING AREAS
May 21, 2021
CONTOURS
2 FOOT
DATE
October 22, 2018
SCALE
N/A
AyTH 0p
pr��
L)7
Jimmy L. Taggart
Lic. No.
2 4
OP. OSZ 14121 44"
,�P&810NAL B�Gl
O
0xxr�
00
E-
W O
Q
2O�
z
Wa_Q (7
Q J CV >
O
z z J c7 ;
E
_J>Yz
�
JUoa
Ir J - O
WUQ
U
W
�z�m�
c)
U 0 W
04
U J Q
w
0 z 0
z
�U
o
O
W
06
FILE NUMBER
8053
SHEET
09 OF 14
CIARGA\TMPROA8053-01-1) TRAIL\Block 32\ENGINEERINGiDWG\8053-OLD TRAIL- Block 32 - WPO.dwo
II
POST BMP CONVERSION STAGE -STORAGE
Elev(Ft) Storage(CF) Storage(CY) Storage(Acre-Ft) Area(SF) Area(Acre)
642.000 0.000 0.000 0.000 195.840 0.004
644.000 831.004 30.778 0.019 661.054 0.015
646.000 2823.802 104.585 0.065 1361.270 0.031
648.000 6453.083 239.003 0.148 2296.149 0.053
650.000 12157.308 450.271 0.279 3438.624 0.079
652.000 20376.829 754.697 0.468 4818.813 0.111
654.000 31584.229 1169.786 0.725 6426.504 0.148
656.000 46234.511 1712.389 1.061 8261.695 0.190
BASIN STORAGE PROVIDED = 1441 CY ® 655.00 (TOP OF DAM)
STORM EVENTS FOR BIORETENTION FACILTY
EVENT INFLOW (CFS) ROUTED ,CFS)
2-YR 10.95 6.60
10-YR 20.62 8.87
100-YR 39.86 40.63
STORM EVENTS FOR EXTENDED DETENTION FACILITf
EVENT INFLOW (CFS) ROUTED (CFS) ELEVATION (ET) STORAGE (CF)
2-YR 14.02 8.83 650.25 13,172
10-YR 26.08 19.49 651.27 17,380
100-YR 89.43 90.60 652.32 22,180
DAM CONSTRUCTION NOTES:
1. GEOTECHNICAL CONSULTANT TO SPECIFY DAM EMBANKMENT MATERIAL, SEEPAGE CONTROL DEVICES,
CUT-OFF TRENCH DESIGN, CULVERT BEDDING REQUIREMENTS, AND OTHER APPROPRIATE GEOTECHNICAL
DESIGN REQUIREMENTS.
2. IMPERVIOUS CORE SHALL EXTEND TO THE 10-YR WATER SURFACE ELEVATION UNLESS OTHERWISE
NOTED.
3. FOUNDATION AND ABUTMENT AREA EXTENDING 10' BEYOND DAM FOOTPRINT SHALL BE CLEARED,
GRUBBED AND STRIPPED OF ALL VEGETATION TOPSOIL AND/OR ORGANIC SOIL AND OTHER UNSUITABLE
MATERIALS.
4. AFTER CLEARING, GRUBBING, STRIPPING, AND REMOVING ANY OTHER UNSUITABLE MATERIALS, THE
SUBGRADE SHALL BE PROOF -ROLLED WITH COMPACTION EQUIPMENT UNDER THE OBSERVATION OF A
QUALIFIED ENGINEER. THE COMPACTION EQUIPMENT SHALL CONSIST OF THE HEAVIEST POSSIBLE
EQUIPMENT THAT WILL NOT CAUSE DISTURBANCE OF SUITABLE SUBGRADE SOILS. EXCESSIVELY SOFT OR
UNSUITABLE MATERIALS SHALL BE REMOVED AND REPLACED WITH COMPACTED FILL. WHERE ROCK IS
EXPOSED AFTER STRIPPING OR UNDERCUTTING, ALL LOOSE ROCK MATERIAL SHALL BE REMOVED PRIOR
TO PLACING COMPACTED FILL. ROCK SUBGRADES SHALL BE INSPECTED AND APPROVED BY INSPECTOR
OR ENGINEER PRIOR TO PLACEMENT OF FILL.
5. COMPACTED FILL SHALL NOT BE PLACED PRIOR TO PERFORMING THE REQUIRED FOUNDATION AND
ABUTMENT PREPARATION, OR ON ANY FROZEN SURFACE. COMPACTED FILL SHALL EXTEND TO THE FILL
LIMIT LINES AND GRADES INDICATED ON THE APPROVED CONSTRUCTION PLAN. COMPACTED FILL
MATERIAL SHALL BE OF THE TYPE CLASSIFICATION SYMBOL SPECIFIED BY THE GEOTECHNICAL
CONSULTANT, OR OF A BETTER QUALITY MATERIAL AS DEFINED BY THE UNIFIED SOIL CLASSIFICATION
SYSTEM (USCS). RESTRICTIONS ON LIQUID LIMIT AND PLASTICITY INDEX OF MATERIAL MAY BE INCLUDED
WHERE APPLICABLE. COMPACTED FILL SHALL CONSIST OF MATERIAL FREE OF ORGANIC MATTER,
RUBBISH, FROZEN SOIL, SNOW, ICE, AND PARTICLES WITH SIZES LARGER THAN 3" OR ANY OTHER
DELETERIOUS MATERIAL.
6. COMPACTED FILL SHALL BE PLACED IN HORIZONTAL LAYER of 10"-12" IN LOOSE THICKNESS. ACTUAL
LIFT THICKNESS SHALL BE SPECIFIED BY THE GEOTECHNICAL CONSULTANT. THE MOISTURE CONTENT
SHALL BE CONTROLLED SUCH THAT COMPACTION IS ACHIEVED WITHOUT YEILDING OF THE SURFACE.
EACH LAYER SHALL BE UNIFORMLY COMPACTED WITH SUITABLE COMPACTION EQUIPMENT TO AT LEAST
95% OF STANDARD PROCTOR MAXIMUM DENSITY IN ACCORDANCE WITH ASTM D-698, AASHTO T-99,
OR VDOT SPECIFICATIONS. ANY LAYER OF FINE GRAINED FILL WHICH BECOMES SMOOTH SHALL BE
SACRIFICED TO A DEPTH OF 2" TO ALLOW ADEQUATE BONDING BETWEEN LAYERS.
7. COMPACTED FILL WITH A MOISTURE CONTENT WHICH WILL NOT PERMIT COMPACTION TO THE SPECIFIES
DENSITY STANDARD SHALL BE SACRIFICED, DRIED, OR WETTED AS NECESSARY TO PERMIT PROPER
COMPACTION.
GENERAL BIORETENTION NOTES:
1. ALL DRAINAGE AREAS TO A BIORETENTION FACILITY ARE TO BE STABILIZED PRIOR TO INSTALLATION
OF AMENDED SOILS, MULCH OR PLANTINGS.
2. AMENDED SOIL WILL ONLY BE PERMITTED WITH A VALID SOIL ANALYSIS REPORT. NO AMENDED SOIL
SHALL BE ALLOWED ON THE SIDE SLOPES.
3. UNDERDRAIN PIPE SHOULD BE MIN. 6" PERFORATED SCHEDULE 40 PVC (PER AASHTO M278) OR
DOUBLE WALL HDPE (PER AASHTO M252). PERFORATIONS SHOULD BE 3/8" SPACED 6" ON
CENTER ALONG 4 LONGITUDINAL ROWS SPACED 90' APART.
4. UNDERDRAIN CLEANOUTS SHOULD EXTEND A MIN. OF 6" ABOVE MAXIMUM PONDING ELEVATION. ONE
CLEANOUT MAY BE FLUSH WITH TOP OF SURFACE TO ALLOW DRAWDOWN.
5. ONLY SMALL MATURING TREES ARE ALLOWED TO BE PLANTED IN THE AMENDED SOILS.
6. A PERMANENT MAINTENANCE ACCESS EASEMENT MUST BE PROVIDED AROUND THE PERIMETER OF
ALL BMPS TO ALLOW FOR ADEQUATE MAINTENANCE AND REPAIR.
7. AMENDED SOIL WILL ONLY BE PERMITTED WITH A VALID SOIL ANALYSIS REPORT.
8. INSTALL WIRE SCREENING AS NECESSARY AROUND ALL OUTLET OPENINGS TO PREVENT LOSS OF
MULCH.
BIORETENTION WITH EXTENDED DETENTIONI
9VAM"ZI0-®7 STREAM CHANNEL EROSION.
b. Adequacy of all channels and pipes shall be verified in the
following manner:
(2) (a) Natural channels shall be analyzed by the use of a
two-year storm to verify that stormwater will not overtop channel
banks nor cause erosion of channel bed or banks.
Q2YR PRE -DEVELOPMENT = 9.28 CFS
Q2YR POST -DEVELOPMENT = 8.83 CFS
Q2YR POST -DEVELOPMENT - 8.83 CFS S Q2YR PRE -DEVELOPMENT - 9.28 CFS
9VAC25-870-8 FLOODING.
A. Downstream properties and waterways shall be protected from damages from localized flooding due to changes in runoff rate of flow and hydrologic characteristics,
including, but not limited to, changes in volume, velocity, frequency, duration, and peak flow rate of stormwater runoff in accordance with the minimum design standards set
out in this section.
B. The 10-year postdeveloped peak rate of runoff from the development site shall not exceed the 10-year predeveloped peak rate of runoff.
Q10YR PRE -DEVELOPMENT = 27.36 CFS
Q10YR POST -DEVELOPMENT = 19.49 CFS
Q10YR POST -DEVELOPMENT = 19.49 CFS S Q10YR PRE -DEVELOPMENT = 27.36 CFS
STREAM CHANNEL EROSION & FLOODING ANALYSIS
A portion of the exisitng creek that will receive site runoff was visually inspected by Roudabush, Gale & Assoc. in order to obtain design information to
evaluate existing conditions, as well as post -development conditions. The following observations/evaluations were made:
1. The creek appeared to be a rectangular channel with moderate to steep side slope banks. The banks varied in height but showed consistency of 2
feet or more. Water was present in the channel with a gentle flowing depth of 3-3.5 inches. The width of the creek channel varied between 4-5
feet. The creek appeared in good health and lined with natural earthen cover with some tall grass and weeds present. Soils appeared to be clay
loam with natural erosion.
2. Calculations were run using the pre -development and post development conditions for the two and ten year storm events and were evaluated as
such.
3. The bmp measures put forth for the proposed development provide a reduction in the runoff velocity exiting the site for both the two and ten
year storm events. Projected values for the flow depth in the channel were obtained by forecasted linear trend methods and appear to show no
threat of overtopping the banks of the existing channel. By reducing the velocity exiting the site, the measures will be providing additional relief of
natural erosion of the exisiting channel banks, thus satisfying 9VAC25-870-97.
4. While the volume of flow will increase naturallty due to the project development, the rounoff from the site will be routed through multiple, complex
design measures that will react to the increased volume and account for the peak intensity the hydrograph produces from the two and ten year
storm events. No localized flooding is visually present at this time in the existing channel. The bmp measures will decrease the rate of flow that
is exiting the site, reduce the velocity, and spread the peak intensity over a longer duration during a storm event, thus decreasing localized
flooding satisfying 9VAC25-870-98.
/s
s
N\ \ i
BIOFILTER: 6,465 SF
\gl PROVIDED AT ELEVATION
•� PRETREATMENT CELL: 656. FILTER MEDIA 36"
16'x24'x3' STONE
STORAGE TANK BIOFILTER
UNDERDRAIN. CLEANOUTS
20' ON CENTER
BIOFILTEROUTFALL
-
y
// y � y y % � J +' y '1 ~' a �-yT ++�� v, y y y y : •y` ••
\y yy\1 y y y y y \a y � � y_ � y :: " • :. " • ••.� •:.
� �' y�"��.� y y y a y "L-a� y y y y• y y "••:•'•::
p� y y y l y y y yy y yy y y� Y/ .vy`,1, y n ..r• � -1
� -�-
PRE-TREATMENT CELL:~
STONE DIAPHRAGM,
CLASS 1 RIPRAP
PROPOSED CLEANOUTS
I 1
VEGETATIVE BUFFER
t i `` ZONE FOR EXTENDED y y
DETENTION
PROPOSED V/W SWM
EASEMENT
r-,�
k!_tunnowsmMims*
o
BIORETENTION AND EXTENDED DETENTION PLAN VIEW
.'k
0
I
yky
\ 45Z'4
9>
m
r
U
7
m
p
w
CO
U o
U
°
0
Z ZON
Q Y !� 02
Cn
J
H 01 Q w U
Q
T J =
O¢ U � m
D_ Z C) w Q
o
co 0
Ow 0
M, a
_J
J Z v U
Z�
¢_
i
�j
U) o
WW o
Fil
EFn--�
UL Z
O Z rn
5;aNo
I�
v
_
W
CIDN w
Q Z
> O
J
va w a
J
=Zw
0
az
o)
•,
04
w o
U Q
rn =
rn U
REVISIONS
COUNTY COMMENTS
Feb 15, 2019
COUNTY COMMENTS
April 15, 2019
FOR APPROVAL
May 21, 2019
REV. MITIGATION
PLANTING AREAS
May 21, 2021
CONTOURS
2 FOOT
DATE
October 22, 2018
SCALE
AS SHOWN
Op
pr��
�o{4$AyTH
U
7
9
Jimmy L. Taggart
Lic. No.
2 4
Ado OSZ 214121
��&s'470NAL B�Gl
r
r
O
O
W
O
o
z0
O
a
2Ow
Z
W
a 0
�
a
Q
J N>
E-
zzJ(y)>
W
\
_J>YZ
JUo
Ir
LL]
_J - O
O Q
E-
E-
W
z
�z�m<
O❑ W
U J __JJ
w
oz0
o
o
U)
O
0.
W
06
FILE NUMBER
8053
SHEET
10 OF 14
WRGA\TMPROA8053-OLD TRAIL\Block 32\ENGINEERINGIDWG\8053-0LD TRAIL- Block 32 - WPO.dwa
STREAM BUFFER MITIGATION
RESTORATION
REQUIREMENTS
STREAM BUFFER AREA
DISTURBED
AREA
A
2,195 SF (0.05
AC)
AREA
B
11,774 SF (0.27 AC)
AREA
C
381 SF (0.009
AC)
AREA
D
195 SF (0.004
AC)
AREA
E
128 SF (0.003
AC)
AREA
F
292 SF (0.007
AC)
AREA
G
2,002 SF (0.05
AC)
AREA
H
3,293 SF (0.08
AC)
TOTAL
AREA
.4
A
STREAM BUFFER
MITIGATION/REPLACEMENT
RATIO
— 2:1
MITIGATION AREA
REQUIRED = 40,520 SF
(0.93
AC)
MITIGATION AREA
PROVIDED = 40,537 SF
(0.93
AC)
STREAM —BUFFER MITIGATION GENERAL PLANTING NOTES
SITE PREPARATION SHOULD BEGIN IN THE FALL PRIOR TO THE TREE PLANTING AND SEEDING IF
IT IS NECESSARY TO KILL OFF ANY INVASIVE UNDESIRED SPECIES WITH HERBICIDES. UNDESIRED
SPECIES MAY INCLUDE MULTIFLORA ROSE, HONEYSUCKLE AND OTHER SPECIES DEEMED TO BE
INVASIVE BY THE VIRGINIA DEPARTMENT OF CONSERVATION AND RECREATION. THE HERBICIDE
SHOULD BE APPLIED BY A LICENSED SPRAY TECHNICIAN USING A NON —TOXIC, BIODEGRADABLE
HERBICIDE TO CONTROL UNDESIRABLE VEGETATION.
PRIOR TO TREE PLANTING AND SEEDING AT THE BEGINNING OF THE NEXT GROWING SEASON,
THE GROUND SURFACE SHALL BE PREPARED AND ORDERED BY TILLING OR SCARIFYING TO A
MINIMUM DEPTH OF 2". TEST SOIL PH; THE PH LEVEL WITHIN THE GENERALIZED ROOT ZONE OF
STREAM BUFFER MITIGATION PLANTINGS SHOULD BE TESTED AND BROUGHT TO WITHIN A RANGE
OF 6.0 TO 7.0. THE PH ADJUSTMENTS CAN BE MADE USING POWDERED LIME.
ALL TREE SEEDLINGS SHALL BE BARE —ROOT, ONE YEAR OF AGE AND GROWN UNDER WET
CULTIVATION CONDITION, WHERE PRACTICAL. PLANTING PATTERNS SHALL BE RANDOM AND MIXED
FOR THE DIFFERENT TREE SPECIES WITH THE SPACING OF 5-7'. TREES SHALL BE PLANTED NO
CLOSER THAN 5 FEET AND NO FURTHER THAN 100 FEET FROM THE TOP OF THE STREAM BANK
ON BOTH SIDES OF THE CHANNEL.
TREE SEEDLINGS SHOULD BE PLANTED AS SOON AS THE AMBIENT SOIL TEMPERATURE IS ABOVE
41' F THROUGH MAY.
PLANTS SHALL REMAIN UPRIGHT DURING TRANSPORT/STORAGE. PLANTS STORED ONSITE MUST BE
PLANTED WITHIN THREE DAYS OF DELIVERY. IN ADDITION, THE PLANTS SHOULD BE STORED IN A
PROTECTED AREA UPON ARRIVAL IN ORDER TO SHADE THEM FROM EXPOSURE TO THE SUN AND
DRYING WIND. PLANTS THAT CANNOT BE PLANTED IMMEDIATELY UPON DELIVERY SHALL BE KEPT
WELL SHADED, PROTECTED, AND WATERED. ALL DAMAGED PLANTS SHALL BE REMOVED FROM
STORAGE WHEREUPON THEY MAY BE USED AS MULCH UNLESS THEY ARE DISEASED.
HOLES EXCAVATED FOR THE TREES SHALL BE 3—TIMES THE CONTAINER DIAMETER OR AT LEAST
6" WIDER THAN THE BARE ROOT DIAMETER. THE HOLES MAY BE EXCAVATED EITHER BY HAND
SHOVEL OR BY POWER AUGER. EXCESS SOIL GENERATED FROM THE EXCAVATIONS SHALL BE
DISPOSED OF RANDOMLY OVER THE SITE. THE PLANTS SHALL BE SET AT THE SAME DEPTH
THAT THEY WERE GROWN IN AND THE TRUNK SHOULD BE SITUATED NEARLY PLUMB. AVOID
PLANTING SEEDLINGS IN EXTREMELY DRY, HOT OR WINDING CONDITIONS. HEAT AND WIND CAN
QUICKLY DRY OUT LEAVES AND ROOTS. WATER THE SOIL AROUND THE SEEDLINGS IMMEDIATELY
AFTER PLANTING.
AREAS COMPACTED BY FOOT OR VEHICLE TRAFFIC SHALL BE TILLED OR AERATED PRIOR TO
RESEEDING AREA AFTER TREES HAVE BEEN PLANTED.
BROADCAST THE SUGGESTED SEED MIX BY HAND OR MACHINE EVENLY OVER THE PLANTING
AREA AND COVER THE SEEDS WITH APPROXIMATELY 1/4—INCH OF SOIL USING A DISK OR
OTHER IMPLEMENT. AFTER SEEDS ARE COVERED, THE SOIL SHOULD BE LIGHTLY ROLLED TO
ENSURE A GOOD SEED TO SOIL CONTACT FOLLOWED BY APPLICATION OF CHOPPED AND BLOWN
WHEAT STRAW MULCH.
NO STORAGE OF HERBICIDES OR OTHER AGRICULTURAL CHEMICALS SHALL BE PERMITTED NEAR
THE PLANT STORAGE OR MITIGATION AREAS.
IIL
NOTE:
FOR BLOCK 32, A PORTION OF THE REQUIRED
MITIGATION AREA IS ADDRESSED BY PLANTING AREAS
1 AND 5 IN THE "STREAM BUFFER MITIGATION
MASTER PLAN" (WP0201900007). COMBINED THESE
AREAS ACCOUNT FOR 40,537 SF OF THE MITIGATION.
PLANING AREA #3 FROM WP0201900007 WILL BE
HELD IN RESERVE AND WILL NOT BE PLANTED AT
THIS TIME
A
U
o
m
w
H
^
s
�o
U
ON
Q0',O
z zco
�Y* 0
Cn
Q 0) < J O
�
Ir 00 a( m
0-z =W
pin 0_o D
W J O
O2 �Q
Q v U
ZO
001
>
o
Cf) o
w (7
V1
0 z r
N �
Y-�
O
a W N
N W
Q Z
O
U J a
J
} 7 >
O
= 0 W
a
00
Fil
W O
U)
o
=
oO O
REVISIONS
COUNTY COMMENTS
Feb 15, 2019
COUNTY COMMENTS
April 15, 2019
FOR APPROVAL
May 21, 2019
REV. MITIGATION
PLANTING AREAS
May 21, 2021
CONTOURS
2 FOOT
DATE
October 22, 2018
SCALE
V=30'
Op
pr��
�o{��AyTH
U 97
Jimmy L. Taggart
Lic. No. 4
Ado 052je4121 }�w
F�&SIONAL E�Gl
r
r
O
O
O
i
00
ZT
O
z
LU a_
�
(� Q O
Ems—
W
Q J N>
Q
z z _j (y) ;
w
_j>Yz
�JUO
o
10QO°
z
l J _
z
O W
OTC U J m
F
Oz0
U
O
Ir
W
06
FILE NUMBER
8053
SHEET
11 OF 14
Q:\RGA\TMPROJ\8053-OLD TRAIL\Block 32\ENGINEERING\DWG\8053-OLD TRAIL- Block 32 - WPO.dwo
Q:\RGA\TMPROJ\8053-OLD TRAIL\Block 32\ENGINEERINGDWG\8053-OLD TRAIL- Block 32 - WPO.dwa
Q:\RGA\TMPROJ\8053-OLD TRAIL\Block 32\ENGINEERINGDWG\8053-OLD TRAIL- Block 32 - WPO.dwa
I,
ALBEMARLE COUNTY RECORD DRAWING
REQUIREMENTS (AS -BUILT) FOR VSMP
• A SIGNED AND DATED PROFESSIONAL SEAL OF THE PREPARING ENGINEER OR SURVEYOR.
• THE NAME AND ADDRESS OF THE FIRM AND INDIVIDUAL PREPARING THE DRAWINGS ON THE TITLE SHEET.
• 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 SURVEY FOR ALL EARTHEN STRUCTURES. PONDS SHOULD INCLUDE A
SURVEY 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.
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 DEED BOOK REFERENCES LABELED. FACILITIES AND
DRAINAGE MUST BE WITHIN PLATTED EASEMENTS. PROVIDE COPIES OF RECORDED DOCUMENTS. (INCLUDED)
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.
L71 A TIi . . - _- • v. %via .
BIOFILTER LANDSCAPE PLAN
PLANT LIST
SYMBOL
QUANTITY BOTANICAL NAME COMMON NAME SUE
COMMENT
BIN
2
Betula nigra "Heritage'
Heritage River Birch
6' Ht.
25' O.C. SPACING
CO
12
Cephalanthus occidentalis
Buttonbush
18-24" Ht.
10' O.C. SPACING
CS
12
Cornus sericea'Baileyi'
Bailey Red Twig Dogwood
18-24" Ht.
8' O.C. SPACING
HV
12
Hamamelis virginiana
Common Witchhazel
24-36" Ht.
15' O.C. SPACING
HM
30
Hibiscus moscheutos
Crimson -Eyed Rose -Mallow
1 Gal. Cont.
3' O.C. SPACING
RSW
38
Ilex verticillata "Red Sprite"
Red Sprite Winterberry
18-24" Ht.
T O.C. SPACING
JDW
6
Ilex verticillata "Jim Dandy"
Jim Dandy Winterberry
18-24" Ht.
5' O.C. SPACING
VD
15
Viburnum dentatum
Arrowwood Viburnum
24-36" Ht.
10' O.C. SPACING
MIX 1
0.5 LBS
Ernst Conservation Seeds, Inc. ERNMX-180-2 -- Southeast Rain Garden Mix or Equivalent
20
SCALE: 1
0 20 40 60
GENERAL NOTES & MINIMUM STANDARDS
1. PLANT LIST TOTALS ARE FOR CONVENIENCE ONLY AND SHALL BE VERIFIED PRIOR TO
BIDDING.
2. TIMING OF INSTALLATION: LANDSCAPING IN BIO—FILTER SHALL BE THE FINAL STEP IN
CONVERSION OR CONSTRUCTION AFTER ALL OF THE UPSLOPE AREAS HAVE BEEN
STABILIZED.
3. MIX 1 SHALL BE BROADCAST BY HAND OVER THE ENTIRE SURFACE AREA OF THE
BIOFILTER AFTER THE MULCH HAS BEEN PLACED, RAKE SEED MIX INTO MULCH TO
ENSURE GOOD CONTACT FOR GERMINATION. THE SEED MIX IS TO BE APPLIED
WITHOUT THE SUGGESTED COVER CROP.
4. ALL SHRUBS TO BE PLANTED SHALL MEET THE SPECIFICATION OF THE AMERICAN
ASSOCIATION OF NURSERYMEN. PLANTING SHALL BE DONE IN ACCORDANCE WITH
EITHER THE STANDARDIZED LANDSCAPE SPECIFICATIONS JOINTLY ADOPTED BY THE
VIRGINIA NURSERYMEN'S ASSOCIATION, THE VIRGINIA SOCIETY OF LANDSCAPE
DESIGNERS OR THE VIRGINIA CHAPTER OF THE AMERICAN SOCIETY OF LANDSCAPE
ARCHITECTS, OR THE ROAD AND BRIDGE SPECIFICATIONS OF THE VIRGINIA
DEPARTMENT OF TRANSPORTATION.
5. CONTRACTOR SHALL ASCERTAIN LOCATION OF ALL UTILITIES PRIOR TO EXCAVATION.
PRIOR TO COMMENCING ANY WORK, CONTACT "MISS UTILITY" AT 1-800-552-7001.
6. ALL PLANT MATERIAL TO BE GUARANTEED DURING INSTALLATION AND UNTIL FINAL
PROJECT ACCEPTANCE. ANY PLANT MATERIAL WHICH DIES, IS DAMAGED OR DISEASED,
OR IS UNHEALTHY AND IN UNSIGHTLY CONDITION, OR OTHER CAUSES DUE TO
CONTRACTOR'S NEGLIGENCE SHALL BE REPLACED IMMEDIATELY AT THE CONTRACTOR'S
EXPENSE.
7. ALL SITE PLANTINGS OF TREES AND SHRUBS SHALL BE ALLOWED TO REACH, AND
BE MAINTAINED AT MATURE HEIGHT. THE TOPPING OF TREES IS PROHIBITED. SHRUBS
AND TREES SHALL BE PRUNED MINIMALLY AND ONLY TO SUPPORT THE OVERALL
HEALTH OF THE PLANT.
J
r
U
7
m
p
w
^
�o
U
°
O
Z z U)
0ID �Y� 02
to J
1- 0) taw U
Q
T
Ir J =
OU ¢� m
o Z =w Q
ow wo 0
0
OQ �a
12 v IE
z�
�¢_
>
o
W o
W
En
Z
O
aW
N w
Q Z
J > O
vaiw a
J
>- V >
=Zw
OaZ
o)
•,/
Fil
w o
UQ
m=
rn U
REVISIONS
COUNTY COMMENTS
Feb 15, 2019
COUNTY COMMENTS
April 15, 2019
FOR APPROVAL
May 21, 2019
REV. MITIGATION
PLANTING AREAS
May 21, 2021
CONTOURS
2 FOOT
DATE
October 22, 2018
SCALE
AS SHOWN
AyTH Op
pr��
97
Jimmy L. Taggart
Lic. No.
2 4
A'Po 05Z 214121
�V910NAL B�Gl
r`
0
O
O
w
T
z
W
o LLI Q
�:D
W
W z
Q4
C7
Q�
J N>
zzJ(Y)>
_j>Yz
J 0
Q
WQQO°
_
1221
w
O
w
P4
2
0 C) W
�U
J
oz0
<W
0
a
U)
O
Q
W
z
06
FILE NUMBER
8053
SHEET
14 OF 14
WRGA\TMPROA8053-01-13 TRAIL\Block 32\ENGINEERINGOWG\8053-01-13 TRAIL- Block 32 - WPO.dwa