HomeMy WebLinkAboutWPO201400028 Plan - As-built 2023-06-07VSMP AS -BUILT PLAN FOR
LEGEND
EXIST
NEW
DESCRIPTION
165 TC
x 125 TC
TOP OF CURB ELEVATION
165
x 125
SPOT ELEVATION
165 TW
x 125 TW
TOP OF WALL ELEVATION
165BW
x 125BW
BOTTOM OF WALL ELEVATION
®
BENCHMARK
m
STORM SEWER
--- _: -
RG
ROOF DRAIN
SEWER LINE
- 6"w --
6..w
WATER LINE
GAS
GAS
GAS LINE
-- OHE
OHE
OVERHEAD ELECTRIC WIRE
--- UGE --
UGE
UNDERGROUND ELECTRIC
OHT
GHT
OVERHEAD TELEPHONE LINE
UGT
UGT
UNDERGROUND TELEPHONE LINE
PROPERTY LINE
- --
ADJACENT PROPERTY LINE
-----
VACATED PROPERTY LINE
BUILDING SETBACK
PARKING SETBACK
A I-
DRAIN INLET (DI)
OO
QA O
STORM/SANITARY MANHOLE
E
[
PLUG
WATER VALVE & BOX
FIRE HYDRANT
co
®
WATER METER
�.�
LIGHT POLE
UTILITY POLE
--
SANITARY EASEMENT
----
--
GRADING EASEMENT
--
DRAINAGE EASEMENT
-
UTILITY EASEMENT
- --
---- - ----
WATER EASEMENT
ACCESS EASEMENT
-- -----
-
-
STORM DRAINAGE EASEMENT
TREE LINE
FENCE
-
STREAM
312-
12
INTERVAL CONTOUR
30D
00
INDEX CONTOUR
CG-2
CG-2
STANDARD 6" CURB
CG-6
- =
CG-6
COMBINATION 6"
CURB & GUTTER
CONCRETE PAVEMENT /
SIDEWALK
RIPRAP
ASPHALT
GRASS
EC-2 MATTING
EC-3 MATTING
WETLAND
10
o
PARKING COUNT
CROSSWALK
HANDICAP ACCESSIBLE AISLE
A_N
A_N
CG-12
&
&
HANDICAP PARKING
NOTE: THE SIZE
OF THE SYMBOLS
MAY VARY FROM WHAT IS SHOWN.
FAN OF5 CORNER
WPO 201800088
TMP 07800-00-00-005AO, TMP 07800-00-00-0051505
TMP 07600-00-00-005EO, * TMP 07800-00-00-056G I
RIVANNA DISTRICT, ALBEMARLE COUNTY, VIRGINIA
VICINITY MAP SCALE: 79V=1,000'
n
E50 ,�-� •`�yti
Oardeo f o we ;',fe;Ct
SITE
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IMAUL PKUVIULU BY UUUGLL MAPS
SHEET INDEX
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25t)
C I
- A5-BUILT
COVER 511EET
C2
- A5-BUILT
VSMP PLAN
C3
- A5-BUILT
DETENTION 5Y5TEM DETAI L5
C4
- AS -BUILT
STORM SEWER PROFI LE5
C5
- A5-15UILT
5WM DETAI L5 AND DRAINAGE MAPS
µ a 7 COUNTY OF ALBEMARLE
`r
Department of community F)evetoprnent
.r
Construction Record Drawings (As -built) for VSMP
The following is a list of information required on construction record drawings for
stormwater facilities (reference: Water Protection Ordinance 17-422). It is preferable that the
construction record drawing be prepared by someone ether than the designer. Please do not
provide design drawings as construction record drawings.
A. A signed and dated professional sea] of the preparing engineer or surveyor.
B. The name and address of the firm and individual preparing the drawings on the title sheet.
C. The constructed location of all items associated with each facility, and the inspection records to verify
proper dimensions, materials and installation. The items include, but are not limited to the following:
t, 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 he required
for altcratims 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, culverVpipe 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 scaled computations verifying that
the as -built condition is equivalent or better than design.
9. Ditch Lines - Display the Instructed location of all ditch lines and channels, including typical
sections and linings.
10. Easements - Show all platted easements with dead book references labeled. Facilities and drainage
must be within platted casements. Provide copies of recorded documents.
11. Guardrail, fences or other safety provisions - Msplay the constructed location of all safety
provisions; fences, guardrail, including the type, length and applied end treatments, compared to
design.
12. Material layers - biofiller media, stone layers, sand layers, keyways and cores must be verified as to
material types and depths. Include inspection reports, N-Hing 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 nNuire:d to verify fill compaction in dams.
15. Manufacturers certifications for proprietary BMP's certifying proper installation and functioning.
��.-, Htltorj
OWNER / DEVELOPER
Pantops Corner, LC. Pantops, LC.
12704 Crimson Ct Ste. 101 12704 Crimson Ct Ste. 101
Henrico VA, 23233 Henrico VA, 23233
WiDROVED
Ly aba Albemarle County
'O> l De Vment Djeparment
DM
C1a a/ z 3
Fie �
ZONING
TMP 78-5A, 5B, 5C, 5E
HC - Highway Commercial, EC - Entrance Corridor
-Potions are within Managed Steep Slopes Overlay District
TMP 78-58G1
HC - Highway Commercial, EC - Entrance Corridor
Per Approved ZMA 2013-00002. Proffers dated November 26, 2013. ZMA
approval date by Board of Supervisors, December 11, 2013.
-Within the FH Flood Hazard Overlay District
-Portions are within Managed and Preserved Steep Slopes Overlay District
SOURCE OF TITLE
Tax Map 78, Parcel 5A, 5B & 58G1: D1B 4358 PG 684
D113 5147 PG 228-229 PLAT
Tax Map 78 Parcel 5E: D1B 2976 PG 576
DB 5147 PG 228-229 PLAT
Tax Map 78 Parcel 5C: DB 4873 PG 577
DB 5147 PG 228-229 PLAT
MAGISTERIAL DISTRICT
Rivanno
BENCHMARK
Datum for topography is NAVD88.
SOURCE OF BOUNDARY & TOPO
Boundary & topographic survey information provided by:
Field survey provided by Roger W. Ray & Associates, Inc. on March 23,
2018. Updated XY data on October 16, 2018.
Datum for topography NAVD88.
As -Built Road Survey provided Iby:
Shimp Engineering, P.0
Date Completed: 3/23/2021
As -built Detention Survey provided by Roudabush, Gale & Associates. on October 30, 2019.
Detention pipe inspection & wallkthru by Shimp engineering, p.c. on October 03, 2019.
system reinspected by shimp engineering, p.c. on December 1, 2022
STORMWATER MANAGEMENT NARRATIVE
1. ALL CONCENTRATED ONSITE RUNOFF SHALL BE ROUTED INTO CHANNELS AT RATES THAT COMPLY WITH
VA TYPE 11C SWM REULATIONS AS THE SITE IS GRANDFATHERED INTO A TYPE IIC SWM PERMIT.
2. WATER QUANTITY IS ADDRESSED PER 9VAC25-870-97&98 (TYPE IIC REGS). AT EACH POINT OF
ANALYSIS, THE POSTDEVELOPMENT 2-YR AND 10-YR PEAK RUNOFF IS LESS THAN THE PREDEV PEAK
RUNOFF.
3. WATER QUALITY WILL BE ADDRESSED PER 9VAC25-870-96 (TYPE IIC REGS) WITH THE PURCHASE OF
8.49 LBS OF PHOSPHOROUS NUTRIENT CREDITS TO SATISFY THE NUTRIENT LOAD REDUCTION AS SET
FORTH BY THE DEQ IN THE VIRGINIA STORMWATER MANAGEMENT PROGRAM.
4. STORM SEWER ON TM 78-5A TO BE DESIGNED UNDER WAWA SITE PLAN. THIS VSMP PLAN COVERS
THE CONVEYANCE AND TREATMENT OF RUNOFF FROM PARCEL TM 78-5A BUT NOT THE STORM SEWER
DESIGN WITHIN THIS PARCEL.
UNDERGROUND DETENTION MAINTENANCE NOTES
1. INSPECT THE 3 TRASH SCREENS AT DETENTION INLET AREAS TWICE PER YEAR, IN THE
SUMMER AND IN THE WINTER. CLEAN OUT DEBRIS WITH VAC -TRUCK DURING
INSPECTION. REPAIR SCREENS IF NEEDED.
2. INSPECT WEIR PLATE ORIFICES, TRASH RACKS, AND WELDS ANNUALLY. REMEDY ANY
CLOGS OR FAILURES, AND REPLACE ORIFICE TRASH RACKS IF NEEDED.
3. INSPECT GENERAL SYSTEM DEBRIS ACCUMULATION ONCE EVERY 2 YEARS. IF DEBRIS OR
SEDIMENT IS NOTICED, CLEAN OUT SYSTEM WITH A VAC -TRUCK USING ACCESS RISERS.
DETENTION SYSTEM MAIN ACCESS: 38.036166',-78.452745°
AS -BUILT NARRATIVE
THIS AS -BUILT SHOWS COMPLETION OF THE PANTOPS CORNER VSMP PLAN.
THE DETENTION SYSTEM AND STORM SEWER WAS BUILT IN ACCORDANCE WITH
APPROVED PLANS. THE DETENTION SYSTEM WAS OBSERVED TO HAVE ADEQUATE
STONE BEDDING, ADEQUATE STONE BACKFILL, ADEQUATE FILTER FABRIC WRAPPING,
AND ADEQUATE PIPE INSTALLATION. SHIMP COMPLETED A WALKTHROUGH OF THE
INSTALLED DETENTION SYSTEM TO CONFIRM THAT THE SYSTEM WAS SOILTIGHT AND IN
GOOD CONDITION. STORM SEWERS HAVE BEEN INSPECTED WITH PIPE CAMERA AND
APPEAR TO BE IN GOOD CONDITION.
PERMIT COMPLIANCE
THIS PROJECT ACHIEVES COMPLIANCE WITH THE REQUIREMENTS OF THE WPO AND
LAND DISTURBANCE PERMIT. RUNOFF COMPLIES WITH REQUIRED PEAK FLOW RATES:
Pre-Dev
POA 1
Post-Dev
POA 1
Asx-Built
POA 1
Pre-Dev
POA 2
Post-Dev
POA 2
As -Built
POA 2
Year
4.09 cfs
4.03 cfs
4.102 cfs
1.20
1.01 cfs
1.14 cfs
10-Year
12.32 cfs
12.18 cfs
12.18 cfs
3.44
2.37 cfs
2.55 cfs
Pre-Dev to Rte 250
Post-Dev to Rte 250
As -Built to Rte 250
10-Year*
11.21 cfs
11.80 cfs
11.42 cfs
AS -BUILT NUTRIENT TREATMENT COWPLIES WITH REQUIRED REMOVAL RATES:
APPROVED AREA TOTALS: AS -BUILT AREA TOTALS:
5.23 AC IMP 5.21 AC IMP
1.59 AC PERV 11.61 AC PERV
APPROVED NUTRIENT CREDIT AMOUNT: 8.49 LBS
PURCHASED NUTRIENT CREDIT AMOUNT: 8.49 LBS
SEE BILL OF SALE ON SHEET C5.
SAM
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(�16,805 SF`j -FLOOR \ _
37 43- FLOORS ABOVE GRADE
OVER 2 BASEMENT LEVELS) _
-
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INV oc,fi
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EXISTING
EXISTING =
— o
/ -.. 380 SF I y-- LOADING DOCK D G B
P6 CG-6 i OFFICE -- — --,_` u cJ t >
. B
o , 0 SPACES)
+3
BSMT ELEV=369.10 148' i FFE = 387.88 i I J _
J. APPROX. LOCATION �_.. _.... _.
_ EXISTING ROOF
AND CURB I
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Date
18 2019
Scale
NSA
30 0 30 60 90 Sheet No.
Scale: 1 "=30' C2 OF 5
File No.
1 ? nr)r-;
Y
A (6j6 S�S
i - ---- -
1
�.:
EMBEDq:. 4
- _ _.._..._____ _ . -_-__ _._ _-___._._..___ _ ..__ _ -..
I M 3 7 7 0 -A� ---
��
I 1 olkA_ �� INV.=354.3 1
(]�PANTOPS CORNER WAY BMP PLAN 10 ° 10 20 30
C3 SCALE: 1 "=30' Scale: 1 "=10'
AS -BUILT CMP DETENTION NOTES:
1. SYSTEM WAS OBSERVED TO BE INSTALLED IN TRENCH WHICH HAD 48" SPACING BETWEEN PIPES; AND MINIMUM 36" WIDE ENVELOPE AROUND
ENTIRE SYSTEM.
2. SYSTEM INVERT WAS OBSERVED TO BE FLAT. IT WAS OBSERVED THAT THE CONTRACTOR WAS UISING A LASER LEVEL TO INSTALL STONE AND
PIPES.
3. AS -BUILT BEDDING MATERIAL: #57 STONE PLACED IN 6"-12" LIFTS
4. PIPE MATERIAL: 14 GAGE ALUMINIZED PERFORATED CORRUGATED STEEL PIPE, 5%1" CORRUGATIONS.
5. TRASH SCREENS WERE FIELD OBSERVED TO BE INSTALLED BY MANUFACTURER PER PLAN.
6. HAUNCH ZONE MATERIAL WAS OBSERVED TO BE HAND SHOVELED INTO PLACE.
7. THE BACKFILL MATERIAL WAS OBSERVED TO BE #57 STONE WHICH IS A FREE -DRAINING, ANGULAR, WASHED -STONE PER AASHTO M 43.
MATERIAL WAS PLACED IN 12" MAXIMUM LIFTS AND WAS WORKED INTO THE PIPE HAUNCHES BY MEANS OF SHOVEL -SLICING, RODDING, AND
VIBRATORY PLATE TAMPER.
8. CMP RISERS WERE OBSERVED TO BE INSTALLED PER PLAN.
9. MIRAFI 14ON GEOTEXTILE WAS USED AROUND TOP AND SIDES OF STONE BEDDING TO PREVENT SOIL MIGRATION.
10.DETENTION PIPES WERE INSTALLED SOILTIGHT AT JOINTS BY USE OF GASKET AND HUGGER BANDS. THIS WAS CONFIRMED WITH A FIELD
INSPECTION AND SYSTEM WALKTHROUGH.
11. DETENTION PIPES WERE FIELD VERIFIED TO CONFIRM APPROPRIATE SECTIONS WERE SOLID WALLED OR PERFORATED PER PLAN.
NOTE: WEIR PLAIFE IS 12 GAGE
PREMANUFACTURIED ALUMINIZED
STEEL REINFORCED & WELDED TO
TOP ELE=363.10
CMP DETENTION (PIPE
f6p FEE— 9g
LADDER ON
16 GAGE ALUMINIZED STEEL
UPSTREAM SIDE
WIRE TRASH SCREEN. WELD
2.28
ELE=360.82
TO INSIDE OF CMP PIPES.
� E'
12' WEIR
6.72' /
00'
_
EL{art ELE=358.30
3'x8' ORIFICE
(B) NO TRASH RACK
4. 04.?Ei'
INSTALLED BECAUSE
4.0 (A) BOTTOM
4.20'
REINFORCING BARS
TRASH RACK
PREVENT INSTALLATION
7 0
}'
INV ELE=354.10
ORIFICE
4 TRASH SCREEN DETA L (3::) DETENT ON WEIR PLATE DETAIL
C 3 SCALE: 1 =5
5;UALL: 1 =5
THIS ACCESS RISER REMOVED PER
MANUFACTURER REQUIREMENT. UPSTREAM
30" CMP
SIDE OF WEIR PLATE CAN BE ACCESSED
ACCESS RISER
BY OTHER SYSTEM RISERS
W. LADDER
100-YR ELEV=364.70
C
P ELE=366.00
10-YR ELEV=362.95 —
18 YR EL E-_62.85
— —
TEE JOINT
UPTURNED 8'
CMP W. CAP
TOP ELE=362.10
2-YR ELEV=359.34
TeP-FL E- 362„6-
9' WEIR PLATE
INV ELE=354.10
iwd _EL r—T,;,;{,
K3O'ADS
STORM
OUTLET CMP PIPE PORTION EXTENDED PER MANUFACTURER RECOMMENDATION.
THIS PROVIDES A TEE CONFIGURATION (INSTEAD OF AN ELBOW. MANUFACTURER
RECOMMENDED THIS REVISION. INCREASED TOTAL LENGTH BY 4 FEET.
6 DETENTON BARREL 1 DETAIL
C3 SCALE:
1 "=5'
MH-1 FRAME dICOVER
�- FOR THE 5 RISERS IN ASPHALI PARKING
/ LOT, PROVIDE 5' DIAMETER CONCRETE
SUPPORT SLAB 4" THICK, 3000 PS.
PROVIDE MIN 4" GAP FROM TOP OF CONC.
TO RISER RIM ELEV. TO ALLOWASPHALT
PAVEMENT COVER. PROVIDE 6" VDOT #21A
GRAVEL BASE: UNDER CONC, RING.
j- WELD LADDER 70 ACCESS
RISER. CONTINUE LADDER
DOWN TO 8' CMP DETENTION
INVERT
PREMANUFACTURED
RISER STUB
30• CMP RISER
Z� ACCESS RISER DETAIL
C 3 SCALE: 1 "=5'
z
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Date
11 18 2019
Scol e
N/A
Sheet No.
C3 OF 5
File No.
1 1-) nr)1:1
385
380
375
370
365
360
v55
350
3 4
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10+50 11+00 11+`,;0
STORM SEWER PROFILE: Al—A4
C4 HORIZ: 1"=30' VERT: 1'=10'
HORIZ: 1 "=30' VERT: 1'=10'
355
350
345
340
335
330
385
380
405 -
400
- —1
395
390
385 f_
380 T�
375
370
365
360
..............
355
350
345
1n..
375
370
355
10+O,: 0
STORM SEWER PROF LE: A9—A9Z
HORIZ: 1"=30' VERT: 1'=10'
STORM SEWER PROF LE: D 1—D2
HORIZ: 1 "=30' VERT: 1'=10'
11 + 00
11+50
12+00
awl
HORIZ: 1 "=30" VERT: 1 "=10"
0+00
STORM SEWER PROFILE: A5—Al3
HORIZ: 1 "=30' VERT: 1'=10
14+00
15+0
_ 400
5904
F/l
7Iu
385
1
- 380
I
375
I
570
365
i
I
1
t1TJ'
16+00
385
380
375
3-70
365
360
355
350
16+50
385
380
375
370
365
360
355
6300
405 0
0
90
0
--
390 w
w�
385
- 380
375 w
370
_ � w
365
w
N
360 w rn
355
- 350 NL
17+04J p
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STORM SEWER PROFILE: B 1— B 1 A
HORIZ: 1"=30' VERT: 1'=10'
IJTVV
1.5+
405
400
395
390
385
380
375
J70
8 STORM SEWER PROFILE: C3—C4
C4 HORIZ: 1
STORM SEWER PROFILE: All—A11c
HORIZ: 1 "=30' VERT: 1'=10'
IL--____ _._.
BILL OF SALE
Nonpoint Nutrient Offset Credits
BILL OF SALE, made as of J 4-,Q- 1b 2019, by HOTEL STREET CAPITAL,
L.L.C., a Virginia limited liability company ("Seller"), to PANTOPS CORNER, LLC, a Virginia
limited liability company, ("Purchaser").
WHEREAS, Seller and Purchaser have entered into that certain Agreement for Purchase
and Sale of Nutrients Mitigation Credits, dated as of June 20, 2019, (the "Purchase Agreement",
the terms of which are incorporated herein by reference and made part hereof), with respect to the
sale by Seller and purchase by Purchaser of Compensatory Nutrients Mitigation Credits held in
Seller's Nonpoint Offset Bank in Fluvanna County, Virginia (HUC 02080204).
NOW THEREFORE, for and in consideration of the payment of the Purchase Price (as
defined in the Purchase Agreement) and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, Seller hereby sells, transfers, assigns, conveys,
delivers and sets over to Purchaser, its successors and assigns, 8.49 Nutrient Credits ("Credits") as
such are described in the Purchase Agreement.
TO HAVE AND TO HOLD all such Nutrient Credits hereby sold and transferred to
Purchaser and its successors and assigns forever.
IN WITNESS WHEREOF, Seller has caused this Bill of Sale to be executed by its duly
authorized representative as of the date first above written.
HOTEL STREET CAPITAL, L.L.C.
a Virginia limited 1' biW company
by Grayson e &,eompany, LLC, its
By:
Name: " ho as James
Its: aRer
Project Name: Pantops Corner
Location: Albemarle County, Tax Map 78 Parcels �/5B, 5E, & 58G1
Owner: Pantops Corner LC
12704 Crimson Ct Ste. 101
Henrico Va, 23233
Credit Amount Desired: 8.49 Ibs
Project HUC: 020802040401 Rivanna River -Meadow Creek
Application: WP0201800088
OFFSITE AREA
(RTE 20 ROW
IMPROVEMENTS)
AFFIDAVIT OF PHOSPHOROUS OFFSET SALE
HOTEL STREET CAPITAL, L.L.C., a Virginia limited liability company ("Seller"), hereby
certifies the following:
1. Pursuant to that certain Agreement for Purchase and Sale of Nutrients Mitigation Credits,
dated a of May 23, 2019 (the "Purchase Agreement"), the Terms of which are incorporated
herein by reference and made a part hereof) between Seller and the PANTOPS CORNER,
LLC, ("Purchaser"), for the benefit of the Purchaser, Seller agreed to sell 2.82 pounds of
nonpoint source phosphorus offsets (the Nutrient Credits) to Purchaser and retire the associated
ratio of nonpoint source nitrogen offsets at the offset generating facility in the amount of 12.91
pounds of nitrogen offsets relating to the Project known as VSMP Plan for Timberwood
Square in the Forest Lakes Community off of Rt. 29 in the northern portion of Albemarle
County. Virginia having Albemarle County Tax ID Numbers of TMP's: 046134-00-00-007130,
046134-00-00-00700
2 Seller and Purchaser, as of the date hereof, have closed the transaction contemplated by the
Agreement and the Seller has sold to Purchaser the phosphorous offsets.
WITNESS the following signature:
HOTEL STREET C AL, L.L.C.
a Virginia limit 1 11ity company
By: GRAYSO OV & COMPANY, LLC, Manager
Date: l0 q By:
homasJ mes Ross II, Managing Member
STATE OF VIRGINIA
COUNTY OF FAUQUIER:
Sworn and subscribed before me this day of J u,A, , 2019, by Thomas James
Ross II, Managing Member of Grayson Love & Company, LLC, Manager of HOTEL STREET
CAPITAL, L.L.C., a Virginia limited liability company.
Notary P 1c KELLY LYNN ESTEPPE
My Commission expires: I a 3 _ ' NOTARY PUB! _iC
REG. #7�11805
,- COMMON+NEALTH OF VMC-11A
Project Name: Pantops Corner MY COTSSI N EXPIRE,;
Location: Albemarle County, Tax Map 78 Parcels , B, 5E, `I
Owner: Pantops Corner LC
12704 Crimson Ct Ste. 101
Henrico Va, 23233
Credit Amount Desired: Phosphorous 8.49 lbs/Nitrogen 36.69
Project HUC: 02080204
Application: WP0201800088
PANTOPS CORNTER
AS -BUILT LAND COVER MAP
OFFSITE AREA
(RTE 250 ROW
IMPROVEMENTS)
APPLICABLE AREA:
6.67 AC ONSITE +
0.15 AC OFFSITE -
6.82 AC TOTAL
ONSITE AREA,:
D. 09 AC I M P
1.58 AC PER v1/
OFFSITE AREA:
0.12 AC IMP
0.03 AC DERV
TOTAL AREA:
I I I-
13
_ _J
1
!I 4\
IT\71STIR
--------j� �" fi
li 8 20P 0.33 ACRES
I 0.27 AC IMP /
i
I I
\ I
\ I
l
- I ,
1 ,
,
1
li
:1 1 :1 160 240
� -. ■
:0
0 L
m°0
w �
PANTOPS CORNTER o Z
OK
POST-DEV DRAINAGE MAP Q ,, W
RTE 250 INLETS Z
W
w-------- --- Z 2
w OI
_ w� Z
V)
n - ------- - >
1 1 n-- -
` V)
J
1
i ` I
� P6S�ETEG TO D J 1 ) I
1.42 ACRES
/ O
---- v
a -----------
_ _ - �� � � ►mow
W
} Q
}
--------------
1 �
ir
POA I
POSTDEV DRAINAGE INFO
TO POSTEV
D2 &
D1:
TURF HSG B:
0.52
AC
IMPERVIOUS:
0.90
AC
TOTAL:
1.42
AC
TO POSTEV
8 20P:
TURF HSG B:.06AC
IMPERVIOUS:
0.27
AC,'.
TOTAL:
0.33-:
AC `.
HYDROLOGIC DATA
TO POSTEV
D2 &
D1:
Assumed ToC =
5.0
min
02_YR=
5.01
Cfs
Q10-YR=
6.60
cfs
TOTAL TO POSTEV
8-20P:
Q2-YRI 1u
Q10-YR,.,,:
-
yy
1
\; �� `. �'/��,� , - � - �� ---" I I - � �.�.�..� C3 .: : • t5 .
,
\ 4'
14/
,
0
♦♦ \ \\\ ♦
` \ ♦
,ems
v JUS MP a
I
ic. a.1l45183
O
sSfONAL �G
ONSITE AREA TO RTE 250 INLETS
REDUCED FROM APPROVED PLAN.
PEAK FLOW RATE REDUCED. NO
FURTHER ANALYSIS REQUIRED.
PANTOPS CORNTER
AS -BUILT POA DRAINAGE MAP
-''lll '11�?III
I illI ONSITE POSTDEV
t'"" T"-,ri . 4 /�/7oltlS}r'91iWitL:d r, "t a �'e r • . r, i • e ��
}yy r
1
ale
��- --�
I
Ivvic. , c as scca>, r,uc ,�Iw /'11 c� wnli,n Ilvwa w
Rte 250 inlets discharges into the Rivanna
I
River and meets the limits of analysis per
9VAC25-840-40, 19-b(1) & 19-b(2)(c). See
1-" I Rte 250 Inlet Analysis which shows the
I_i I adequacy of the storm drains to the point
of discharge into the Rivanno River.
I I
HYDROLOGIC DATA
POA 1
Assumed ToC to Detention = 6.0 min
Assumed Bypass ToC = 6.0 min
It
--_------_--_ I' Q2-YR 04
Q10-YR= 1 t 7 "
Q - '
! 100-YR-
1 1 y I I' ; , \I \ ''
I \ r Assumed ToC 5.0 min
\1 I �' r yY
Q 2- YR rR
Q10-YRff"',
---}0t5.- �\ 1 ��•'` - -- --- ,' I I' I Q100-YR""
.,, i . ,
Date
11 Z18 2019
Scale
N /A
Sheet No.
C5 OF 5
File No.
12.025