HomeMy WebLinkAboutWPO202000039 Plan - VSMP 2022-08-24CROZET ELEMENTARY
RENOVATION AND
SITE DATA:
TAX MAP PARCEL: 05600-00-00-064EO
COUNTY OF ALBEMARLE SCHOOL BOARD
DB. 1044, PG. 498
DB. 1098, PG. 703
PARCEL AREA: 21.16 AC
LIMITS OF DISTURBANCE: 7.65 AC
IMPERVIOUS AREA: 2.79 AC
ZONING: RURAL AREAS (RA)
STEEP SLOPES (MANAGED) OVERLAY
MAGISTERIAL DISTRICT: WHITE HALL
SOURCE OF BOUNDARY AND TOPOGRAPHY: TIMMONS GROUP
28 IMPERIAL DRIVE
STAUNTON, VA 24401
TELEPHONE: 540-885-0920
CONTACT:JOE MEDLEY
JOE. MEDLEY@Tl MMONS.COM
SURVEY CONDUCTED: MARCH 2O20
DATUM: HORIZONTAL: NAD83(NA2011) VIRGINIA STATE GRID SOUTH
VERTICAL: NAVD88 VIA GPS RTK OBSERVATIONS
REQUIRED BUILDING SETBACKS: FRONT 75 FT MINIMUM (EXISTING PUBLIC ROAD)
FRONT 25 FT MINIMUM (INTERNAL PUBLIC/PRIVATE ROAD)
SIDE 25 FT MINIMUM
REAR 35 FT MINIMUM
SCHOOL ADDITION,
SITE IMPROVEMENTS
WPO/VSMP AMENDMENT #2 SUBMISSION - WP0202000039
MAXIMUM BUILDING HEIGHT: 35 FT
PROPOSED BUILDING HEIGHT: KITCHEN ADDITION 16 FT
CLASSROOM + MOVEMENT ADDITION 28 FT (AVERAGE)
LOWER LEVEL VESTIBULE 10 FT
PROPOSED BUILDING SQUARE FOOTAGE: KITCHEN ADDITION
2,180 GSF (1 STORY)
CLASSROOM + MOVEMENT ADDITION
31,753 GSF (3 STORIES)
LOWER LEVEL VESTIBULE
982 GSF (1 STORY)
TOTAL
34,915 GSF
EXISTING USE: ELEMENTARY SCHOOL
PROPOSED USE: ELEMENTARY SCHOOL
±34,915 GSF BUILDING ADDITION
±6,175 SF BASKETBALL COURT ADDITION
±33,350 SF PLAYGROUND RENOVATION
±6,250 SF COURTYARD ADDITION
WETLAND IMPACTS: NO WETLANDS ARE IMPACTED AS A PART OF THIS PROJECT
WATER SUPPLY: ACSA PUBLIC WATER
SANITARY SUPPLY: ACSA PUBLIC SEWER
DRAINAGE DISTRICT: RIVANNA
NOTES:
1. THERE ARE MANAGED STEEP SLOPES WITHIN THE PROJECT LIMITS.
2. THERE ARE NO CONSTRUCTION ACTIVITIES PROPOSED WITHIN THE 100-YR FLOODPLAIN.
3. THE SITE IS LOCATED IN A WATER SUPPLY PROTECTION DISTRICT.
4. A WPO STREAM BUFFER IS LOCATED ON THE SUBJECT PROPERTY AND WILL BE MANAGED IN ACCORDANCE
WITH THE ALBEMARLE COUNTY WATER PROTECTION ORDINANCE.
PARKING REQUIRED: THE NUMBER OF REQUIRED SPACES SHALL BE DETERMINED BY ALBEMARLE COUNTY PUBLIC
SCHOOLS, DOCUMENTED IN A PARKING STUDY, AND SUBMITTED TO THE ZONING ADMINISTRATOR FOR APPROVAL
EXISTING PARKING: 86 SPACES
PROPOSED PARKING: 130 STANDARD SPACES
6 ADA SPACES
136 TOTAL EVERYDAY USE SPACES
12 BUS SPACES
41 SPECIAL EVENT SPACES
189 TOTAL SPACES
SPECIAL FLOOD HAZARD AREA INFORMATION:
SPECIAL FLOOD HAZARD AREA (FLOODPLAIN)
YES [ 1 NO [ X 1
TRIP GENERATION
LAND USE: ELEMENTARY SCHOOL
ITE CODE: 520
AMOUNT: 680
UNITS: NUMBER OF STUDENTS
Trio Generation for Crozet Elementary School
LAND USE
ITE CODE
AMOUNT
UNITS
WEEKDAY
AM PEAK HOUR
PM PEAK HOUR
ADT
IN
OUT
TOTAL
IN
OUT
TOTAL
Elementary School
520
680
# of
Students
1285
239
203
442
104
127
231
UTILITY DEMANDS
WATER FLOW (AVERAGE DAILY DEMAND)
AVERAGE FLOW RATES (FROM TABLE A 12VAC5-590-690)
ELEMENTARY SCHOOL = 10 GPD/PERSON
10 GPD/PERSON x 770 PERSONS (90 STAFF + 680 STUDENTS)
TOTAL = 7,700 GPD
AVERAGE HOURLY DEMAND = 7,700 GPD / 24 HOURS = 320.83 GPH
MAXIMUM HOURLY DEMAND = 320.83 GPH X 300% = 962.5 GPH
PEAK HOURLY DEMAND = 962.5 X 150% = 1,443.75 GPH
1,443.75 GPH / 60 MIN = 24 GPM
TOTAL FIXTURE COUNTS
WATER CLOSETS = 44
LAVATORIES = 38
DRINKING FOUNTAINS = 12
SERVICE SINKS = 7
SEWER FLOW (AVERAGE DAILY FLOW)
ESTIMATED TOTAL = 10 GPD/PERSON x 770 PERSONS
= 7,700 GPD
COUNTY OF ALBEMARLE, VIRGINIA
WHITE HALL DISTRICT
VaQ �d
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8/24/2022
i
PROJECT
LOCATION
Crozet Three Wo ch d it'd
kt,Sh Rr�rncvillp
Eton
WPO AMENDMENT #2 DESCRIPTION
• INCREASE IN DISTURBED AREA TO KEEP SURPLUS DIRT ON SITE AND
TURN IT INTO A U12 SOCCER FIELD IN THE BACK OF THE PROPERTY
AT THE END OF THE PROJECT (SEE SHEET C3.11 & C4.2)
• UPDATED VRRM FOR ADDITIONAL DISTURBANCE. NO ADDITIONAL
TREATMENT NEEDED AS WE WERE OVER THE MINIMUM
REQUIREMENT PREVIOUSLY (SEE SHEETS C6.0 & C6.2)
• UPDATED NOTE TO RESERVE THE REMAINING 0.01 LB/YR SURPLUS
FOR ANOTHER SCHOOL PROJECT THAT QUALIFIES (SEE SHEET C6.3)
• UPDATED SWPPP ACCORDINGLY
• UPDATED CALC BOOK ACCORDINGLY
nppolochion Mcuntoins
\f7
VICINITY MAP
SCALE: 1" = 2000'
OWNER:
ALBEMARLE COUNTY SCHOOL BOARD
401 MCINTIRE RD
CHARLOTTESVILLE, VA 22902
CONTACT: MATT WERTMAN
TELEPHONE: (434) 975-9340
FAX: (434) 975-9341
ENGINEER OF RECORD:
TIMMONS GROUP
608 PRESTON AVE.
CHARLOTTESVILLE, VA 22903
CONTACT: BRYAN CICHOCKI, P.E.
TELEPHONE: 434-327-5380
Sheet List Table
Sheet Number Sheet Title
C0.0 COVER
C3.11 EROSION & SEDIMENT CONTROL PLAN (GRASS FIELD)
C4.1 LAYOUT & UTILITY PLAN
C4.2 LAYOUT & GRADING PLAN (GRASS FIELD)
C6.0 STORMWATER MANAGEMENT PLAN
C6.2 STORMWATER MANAGEMENT QUALITY
C6.3 STORMWATER MANAGEMENT QUALITY
SIGNATURE PANEL:
DEPARTMENT OF COMMUNITY DEVELOPMENT
PLANNING & ZONING
ENGINEERING
INSPECTIONS
DEPARTMENT OF FIRE AND RESCUE
ALBEMARLE COUNTY SERVICE AUTHORITY
VIRGINIA DEPARTMENT OF TRANSPORTATION
TOTAL SHEETS = 7
APPROVAL
DATE
V M I) 0
VMDO Architects
vmdo.com
434.296.5684
200 E Market Street 2000 Pennsylvania Ave NW Ste 7000
Charlottesville, VA 22902 Washington, DC 20006
• 00090
• 0 �0
TIMMONS GROUP
YOUR VISION ACHIEVED THROUGH OURS.
bemarle County
Public Schools
ALBEMARLE COUNTY PUBLIC SCHOOLS
CROZET ELEMENTARY
SCHOOL ADDITION,
RENOVATION AND SITE
IMPROVEMENTS
1407 Crozet Avenue, Crozet, VA 22932
VDOE Project Number 002-34-00-101
VMDO Project Number 1284
Bryan' D. Cichocki
Lie. No. 53741
Checked By
Designed By
Drawn By
B. CICHOCKI
K. ROESER
K. ROESER
ISSUES AND REVISIONS
NO.
SUBMITTAL
DATE
1
FINAL SITE PLAN & WPO PLAN SUBMISSION
10.AUG.2020
2
FINAL SITE PLAN RESUBMISSION #1
25.NOV.2020
3
WPO PLAN RESUBMISSION #1
02.DEC.2020
4
FINAL SITE PLAN & WPO PLAN SUBMISSION
05.FEB.2021
5
SIGNATURE SET
18.MAR.2021
6
WPO AMENDMENT #1
28.MAY.2021
7
WPO AMENDMENT #2
24.AUGUST.2022
8
MINOR SITE PLAN AMENDMENT #1
24.AUGUST.2022
COVER
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434.296.5684
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Charlottesville, VA 22902 Washington, DC 20006
� 00090
s 0 �0
TIMMONS GROUP
YOUR VISION ACHIEVED THROUGH OURS.
•
rbemarle County
Public Schools
ALBEMARLE COUNTY PUBLIC SCHOOLS
CROZET ELEMENTARY
SCHOOL ADDITION,
RENOVATION AND SITE
IMPROVEMENTS
1407 Crozet Avenue, Crozet, VA 22932
VDOE Project Number 002-34-00-101
VMDO Project Number 1284
Fran D. Cietl0ekl
Lie. No. 53741
i . —,
Checked By
Designed By
Drawn By
B. CICHOCKI
K. ROESER
K. ROESER
ISSUES AND REVISIONS
NO.
SUBMITTAL
DATE
1
FINAL SITE PLAN & WPO PLAN SUBMISSION
10.AUG.2020
2
FINAL SITE PLAN RESUBMISSION #1
25.NOV.2020
3
WPO PLAN RESUBMISSION #1
02.DEC.2020
4
FINAL SITE PLAN & WPO PLAN SUBMISSION
05.FEB.2021
5
SIGNATURE SET
18.MAR.2021
6
WPO AMENDMENT #1
28.MAY.2021
7
WPOAMENDMENT#2
24.AUGUST.2022
8
MINOR SITE PLAN AMENDMENT #1
24.AUGUST.2022
EROSION & SEDIMENT
CONTROL PLAN
(GRASS FIELD)
C3mll
FGOAL NOTES:
1. CONTRACTOR SHALL PROVIDE A TEMPORARY ABOVIf GROUND OIL FUEL TANK WITH CONTAINMENT TO
SERVICE THE SCHOOL DURING THE WINTER MONTH WHILE CONSTRUCTION IS ONGOING. CONTRACTO IS TO
MAINTAIN ACCESS TO TANK SO THAT ACPS CAN KEEr IT FILLED; THERE SHALL BE NO GAP IN AVAILABILI OF
I FUEL OIL WHILE SCHOOL IS IN SESSIONS DURING THE TRANSITION TO THE TEMPORARY TANK. REFER T
/ ARCH/MEP DRAWINGS FOR FURTHER DETAILS AND TILITY ROUTING.
2. A KNOX BOX SHALL BE REQUIRED FOR THE PROPOS D BUILDING ADDITIONS. CONTRACTOR SHALL
/ COORDINATE WITH THE FIRE MARSHAL'S OFFICE FO FINAL LOCATION.
3. EACH OUTDOOR LUMINARE EQUIPPED WITH A LAMP 1HAT EMITS 3,000 OR MORE INITIAL LUMENS SHAL BE A
FULL CUTOFF LUMINARE AND SHALL BE ARRANGED OR SHIELDED TO REFLECT LIGHT AWAY FROM AD NING
/ Q RESIDENTIAL DISTRICTS. SEE SITE PHOTOMETRICEETS FOR ADDITIONAL INFORMATION.
4. BIORETENTION BASINS MAY NOT BE CONSTRUCT UNTIL ALL CONTRIBUTING DRAINAGE AREAS AR
( I STABILIZED. BIORETENTION FACILITIES MUST BE CONSTRUCTED IN ACCORDANCE WITH WP0202000 PLAN.
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PRE -DEVELOPMENT CONDITION
=
POST -DEVELOPMENT CONDITION .
V AA D O
VMDO Architects
vmdo.com
434.296.5684
200 E Market Street 2000 Pennsylvania Ave NW Ste 7000
Charlottesville, VA 22902 Washington, DC 20006
• 00090
0 �0 s
TIMMONS GROUP
YOUR VISION ACHIEVED THROUGH OURS.
•
rbemarle County
Public Schools
ALBEMARLE COUNTY PUBLIC SCHOOLS
CROZET ELEMENTARY
SCHOOL ADDITION,
RENOVATION AND SITE
IMPROVEMENTS
1407 Crozet Avenue, Crozet, VA 22932
VDOE Project Number 002-34-00-101
VMDO Project Number 1284
ran D. Cichocki
Lie. No. 53741
I . _,
Checked By B. CICHOCKI
Designed By K. ROESER
Drawn By K. ROESER
ISSUES AND REVISIONS
NO.
SUBMITTAL
DATE
1
FINAL SITE PLAN & WPO PLAN SUBMISSION
10.AUG.2020
2
FINAL SITE PLAN RESUBMISSION #1
25.NOV.2020
3
WPO PLAN RESUBMISSION #1
02.DEC.2020
4
FINAL SITE PLAN & WPO PLAN SUBMISSION
05.FEB.2021
5
SIGNATURE SET
18.MAR.2021
6
WPO AMENDMENT #1
28.MAY.2021
7
WPOAMENDMENT#2
24.AUGUST.2022
8
MINOR SITE PLAN AMENDMENT #1
24.AUGUST.2022
STORMWATER
MANAGEMENT PLAN
C6n0
VA DCR SPECIFICATION NO. 9 SOIL MEDIA SPECIFICATIONS
VA DCR STORMWATER DESIGN SPECIFICATION NO. 9 BIORETENTION
Table 9.7. Bioretention Material Specifications
DEQ Virginia Runoff Reduction Method Re -Development Compliance Spreadsheet - Version 3.0
O 2011 BMP Standards and Specifications O 2013 Draft BMP Standards and Specifications
Project Name: Crozet Elementary School
Date: 6/28/2022
Linear Development Project? No
Site Information
Post -Development Project (Treatment Volume and Loads)
Enter Total Disturbed Area (acre 7.65
Pre-ReDevelopment Land Cover (acres)
A Soils
B Soils
C Soils
D Soils
Totals
Forest/Open Space (acres) -- undisturbed
forest/open sace
0.01
0.01
Managed Turf (acres) -- disturbed, graded
for yards or other turf to be
5.83
5.83
Impervious Cover (acres)
181
1.81
7.65
Post -Development Land Cover (acres)
A Soils
B Soils
C Soils
D Soils
Totals
Forest/Open Space (acres) -- undisturbed,
0.00
protected forest/open sace or reforested
Managed Turf (acres) -- disturbed, graded
for yards or other turf to be
4.86
4.86
Impervious Cover (acres)
2.79
2.79
Area Check
OK.
OK.
OK.
OK.
7.65
Constants
Annual Rainfall (inches) )
43
Target Rainfall Event (inches)
1.00
Total Phosphorus (TP) EMC (mg/L)
0.26
Total Nitrogen (TN) EMC (mg/L)
1.86
Target TP Load (Ib/acre/yr)
0.41
Pj (unitless correction factor)
0.90
Runoff Coefficients (Rv)
Check:
BMP Design Specifications List: 2013 Draft Stds & Specs
Linearproject? No
Land cover areas entered correctly? ✓
Total disturbed area entered? ✓
A Soils
B Soils
C Soils
D Soils
Forest/Open Space
1 0.02
0.03
0.04
0.05
Managed Turf1
0.15
0.20
0.22
0.25
Impervious Cover
1 0.95
0.95
0.95
0.95
Land Cover Summary -Post
Land Cover Summary -Pre
Land Cover Summary -Post (Final)
Pre-ReDevelopment
Listed
Adjusted'
Post ReDev. & New Impervious
Post-ReDevelopment
Forest/Open Space
Forest/Open Space
Forest/Open Space Cover (acres)
0.01
0.00
0.00
0.00
-Cover (acres)
Cover (acres)
Weighted Rv(forest)
0.03
0.00
Weighted Rv(forest)
0.00
Weighted Rv(forest)
0.00
Forest
0%
0%
%Forest
0%
%Forest
0%
Managed Turf Cover
Managed Turf Cover
Managed Turf Cover (acres)
5.83
4.86
4.86
4.86
(acres)
(acres)
Weighted Rv(turf)
0.20
0.20
Weighted Rv (turf)
0.20
Weighted Rv (turf)
0.20
%Managed Turf
76%
73%
%Managed Turf
64%
%Managed Turf
73%
Impervious Cover (acres)
1.81
1.81
Impervious Cover
279
ReDev. Impervious
1.81
(acres)
Cover (acres)
Rv(impervious)
0.95
0.95
Rv(impervious)
0.95
Rv(impervious)
0.95
%Impervious
24%
27%
%Impervious
36%
%Impervious
27%
Total ReDev. Site Area
Total Site Area (acres)
7.65
6.67
Final Site Area (acres)
7.65
6.67
(acres)
Site Rv
0.38
0.40
Final Post Dev Site Rv
0.47
ReDev Site Rv
0.40
Treatment Volume and Nutrient Load
Treatment Volume and Nutrient Load
Final Post-
Post-ReDevelopment
Pre-ReDevelopment Treatment Volume
Development
02405
02243
0.3019
Treatment Volume
0.2243
(acre-ft)
Treatment Volume
(acre-ft)
(acre-ft)
Final Post-
Post-ReDevelopment
Pre-ReDevelopment Treatment Volume
Development
10,475
9,770
13,150
Treatment Volume
9,770
(cubic feet)
Treatment Volume
(cubic feet)
(cubic feet)
Final Post-
Post-ReDevelopment
Pre-ReDevelopment TP Load
6.58
6.14
Development TP
8.26
Load (TP)
6.14
(Ib/yr)
Load
(Ib/yr)*
(lb/yr)
Final Post -Development
Post-ReDevelopment TP
Pre-ReDevelopment TP Load per acre
0.86
0.92
TP Load per acre
1.08
Load per acre
0.92
(I b/a cre/yr)
(Ib/acre/yr)
(lb/acre/yr)
Baseline TP Load (lb/yr)
Max. Reduction Required
(OA11bs/acre/yr applied to pre -redevelopment area excluding
2.73
(Below Pre-
20%
Pervious land proposed for new impervious cover)
ReDevelopment Load)
'Adjusted Land Cover Summary:
Pre ReDevelopment land coverminus pervious land cover(forest/open space or
managed turf) acreage proposed fornew impervious cover.
Adjusted total acreage is consistent with Post-ReDevelopment acreage (minus
acreage of new impervious cover).
Column I shows load reduction requriementfor new impervious cover (based on
new development load limit, 0.41 lbs/acre/year).
Pre-ReDevelopment TN Load
(l b/yr) 47.08
TP Load Reduction
Required for 1.23
Redeveloped Area
(lb/yr)
Nitrogen Loads (Informational Purposes Only)
Final Post -Development TN Load
(Post-ReDevelopment&New S9.10
Impervious) (Ib/yr)
Land Cover Summary -Post
Post -Development New Impervious
New Impervious Cover
(acres)
Rv(impervious)
Post -Development
Treatment Volume
(acre-ft)
Post -Development
Treatment Volume
(cubic feet)
Post -Development TP
Load (Ib/yr)
0.98
0.95
0.0776
3,380
2.12
TP Load Reduction
Required for New 1.72
Impervious Area
(lb/yr)
Material
Specification
Notes
Filter Media to contain:
The volume ofilter media based on 110%
Filter Media
80% - 90% sand
of the plan volume, to account for settling
Composition
• 10%-20% soil fines
or compaction.
p
• 3%-5%organic matter
Available P between L+ and M per
Filter Media
DCR 2005 Nutrient Management
The media should be certified by the
Testing
Criteria.
supplier.
Mulch Layer
Use aged, shredded hardwood bark
Lay a 2 to 3 inch layer on the surface of the
mulch or stable coarse compost.
filter bed.
Alternative
Use river stone or pea gravel, coir and
Lay a 2 to 3 inch layer of to suppress weed
Surface Cover
jute matting, or turf cover.
growth.
Loamy sand or sandy loam texture,
Top Soil
with less than 5% clay content, pH
3 inch surface depth.
For Turf Cover
corrected to between 6 and 7, and an
organic matter content of at least 2%.
Use a non -woven geotextile fabric with
Apply only to the sides and directly above
Geotextile/Liner
a flow rate of > 110 gal./min./sq. tt.
the underdrain. For hotspots and certain
(e.g., Geotex 351 or equivalent)
ksites only, use an appropriate liner on
m.
bottom.
Choking Layer
Lay a 2 to 4 inch layer of sand over a 2 inch layer of choker stone (typically #8 or #89
washed gravel), which is laid over the underdrain stone.
Stone Jacket for
Ua
1 inch stone should be double -washed
12 inches for the underdrain;
and//oror Storage
and clean and free of all fines (e.g.,
12 to 18 inches for the stone storage layer,
Layer
VDOT #57 stone).
if needed
Use 6 inch rigid schedule 40 PVC pipe
Lay the perforated pipe under the length of
Underdrains,
(or equivalent corrugated HDPE for
the bioretention cell, and install non-
Cleanouts, and
micro-bioretention), with 3/8-inch
perforated pipe as needed to connect with
Observation
perforations at 6 inches on center;
the storm drain system. Install T's and Y's
Wells
position each underdrain on a 1% or
as needed, depending on the underdrain
2% slope located nor more than 20 feet
configuration. Extend cleanout pipes to the
from the next pipe.
surface with vented caps at the Ts and Ys.
Plant one tree per 250 square feet (15
Establish plant materials as specified in the
feet on -center, minimum 1 inch
landscaping plan and the recommended
caliper).
plant list.
Shrubs a minimum of 30 inches high
In general, plant spacing must be sufficient
planted a minimum of 10 feet on-
to ensure the plant material achieves 80%
Plant Materials
center.
cover in the proposed planting areas within
Plant ground cover plugs at 12 to 18
a 3-year period.
inches on -center; Plant container-
If seed mixes are used, they should be from
grown plants at 18 to 24 inches on-
a qualified supplier, should be appropriate
center, depending on the initial plant
for stormwater basin applications, and
size and how large it will grow.
should consist of native species (unless the
seeding is to establish maintained turf).
CLEANOUT
Soil porosity is the fraction of a volume of soil material that is not solid, also referred to as the
void space. As the volume of fines, defined as either clay particles (less than 2 microns, or 0.002
min) or silt particles (between 2 and 50 microns, or 0.002 and 0.05 min) within a given soil mix
is increased, there is a possibility that those fines may be flushed or migrate downward through
the soil mix with each runoff event and eventually fill or otherwise clog the void space randomly
throughout the mix and create preferential flow paths. In the short term this can lead to short
circuiting and reduced volume reduction and pollutant removal, and in the long term may clog
the soil layer. This tendency is offset by addition and maintenance of appropriate amounts of
soil organic matter which binds soil fines into larger non -mobile aggregates.
3" HARDWOOD BARK MULCH
• General Filter Media Physical Composition. The mineral soil texture of the bioretention soil
BOTTOM ELEV 680.25
mix should be loamy coarse sand with no more than 10% clay, no more than 20% silt + clay
36" BIOFILTER MIX
and at least 75% of the sand fraction should be coarse or very coarse sand.
BOTTOM ELEV 677.25
3" NO. 8 STONE
• To allow for appropriate Caton Exchange Capacity (CEC) and nutrient removal, the mix
TOP ELEV 677.00
should contain at least 10% soil fines (silt + clay) while meeting the overall texture
15" NO. 57 STONE
specification above. The particle size analysis must be conducted on the mineral fraction only
or following appropriate treatments to remove organic matter before particle size analysis.
• The Filter Media should contain 3% to S% organic matterby conventional Walkley-Black soil SEE CLEANOUT
DETAIL SHEET C1.1 7
organic matter determination method or similar analysis. Soil organic matter is expressed on a
dry weight basis and does not include coarse particulate (visible) components. 4" PERFORATED
Version 2.0, January 1, 2013 Page 25 of 62
Ir/_\°Zd:�3f•]:7diPL'/_�1�:\a7�.9[•]�691xdIyP7_�t[•]�C[•]E' 7[•Z7���lYi[•P
• The overall particle size distribution of the mix will vary since the sand fraction may contain
some finer sizes as will native topsoils if utilized. As stated previously, the goal of the mixture
is to achieve the desired constant head permeability. Therefore, the filter media composition
noted above serves as the target recipe for the three ingredients, while the ultimate performance
goal is to achieve a verified soil permeability or hydraulic conductivity (Ksat) of 1 to 2 inches
per hour (or 30 to 60 cm/day).
• The following is the recommended composition of the three media ingredients
1
, l
Component
Trash Rack Width
Frame Angle
Iron
Bottom
Flat Steel
Woven/Welded
Wire Mesh
Steel Rod
for Grate
up to 36"
l%"Xlh2"Xl/4"
1Y2"Xl/4"
yi
between 36"-60"
2"X2"X1'4"
2"Xt/4"
60" and larger
3"X3"X%"
3"X%"
Min. Mesh Opening Size
Low Flow -See
BMP-See
6-1604.13B, 8C
6-1604.8B, 8C
4"
1"
Trash Rack General Notes:
Additional Notes
- 3' minimum trash rack width is required
where available.
Trash Racks 60" and wider:
- Trash rack/mounting components to be
- Large trash racks may be painted with
Hot -dip galvanized.
dark anti -corrosive paint, in lieu of
- All mounting hardware to be stainless steel
galvanizing.
and threads to be coated in anti-sieze.
- Additional structural reinforcements to be
- Minimum yz " x 3 " mounting bolts to be
added to trash rack frame as deemed
used for trash rack.
necessary to support all anticipated loads.
- Trash racks to be mounted using top hinge or
- A 3' x 3' (min) access door with locking
side pin connection as per details shown in Plate
mechanism to be installed on front face.
45B-6. All hinged/pinned trash racks to have
locking mechanism. Mechanism to be installed
Trash Racks mounted on Headwalls:
on the upper half to minimize potential to
- In case of space restrictions at headwalls,
become inaccessible due to submergence
under water/sediment.
use 2' min width of trash rack.
- Mesh opening size to be of the
- Add wire mesh on the back of trash rack
diameter/width of orifice being protected, but
to the top of headwall as shown in Plate
not smaller than minimum mesh opening size
45B-6.
provided in table above.
LOW FLOW ORIFICE DEBRIS CAGE DETAIL
NO SCALE
o Sand shall consist of silica based coarse aggregate, angular or round in shape and meet
the mixture grain size distribution below. No substitutions of alternate materials such
as diabase, calcium carbonate, rock dust or dolomitic sands are accepted. In particular,
mica can make up no more than 5% of the total sand fraction. The sand fraction may
also contain a limited amount of particles > 2.0 min and < 9.5 min per the table below,
but the overall sand fraction must meet the specification of >75% being coarse or very
coarse sand.
Sieve
Size
% Passing
3/8 in
9.50 min
too
No. 4
4.75 min
95 to 100
No. 8
2.36 min
80 to 100
No. 16
1.18 min
45 to 85
No. 30
0.6 nun
15 to 60
No. 50
0.3 min
3 to 15
No. 100
0.15 min
0 to 4
Effective Particle size (D10) > 0.3min
Uniformity Coefficient (D60/D10) < 4.0
o Topsoil is generally defined as the combination of the other ingredients referenced in
the bioretention soil media: sand, fines (silt and clay), and any associated soil organic
matter. Since the objective of the specification is to carefully establish the proper blend
of these ingredients, the designer (or contractor or materials supplier) must carefully
select the topsoil source material in order to not exceed the amount of any one
ingredient.
Generally, the use of a topsoil defined as a loamy sand, sandy loam, or loam (per the
USDA Textural Triangle) will be an acceptable ingredient and in combination with the
other ingredients meet the overall performance goal of the soil media.
o Organic matter materials used in the soil media mix should consist of well -
decomposed natural C-containing organic materials such as peat moss, humus, compost
(consistent with the material specifications found in Design Specification #4 Compost
Soil Amendments), pine bark fines or other organic soil conditioning material.
However, per above, the combined soil mix should contain 3% to 5% soil organic
matter on dry weight basis (grams organic matter per 100 grams dry soil) by the
Walkley-Black method or other similar analytical technique.
BMP PRACTICE DOCUMENTATION NOTE:
Extend mesh from the top Apron General Notes:
of the headwall to top of • 6" - 21a compacted to a minimum 95%
rack of standard proctor (ASTM-618) with
filter fabric to be placed under the
leadwall rate removed for clarity. apron.
(See details on Plate • Extend apron to wing -walls, in cases
45A-6) where wing -walls are part of the design.
• Apron to be tied in to the riser/headwall
mo and wing -walla with rebar.
° ///12" OC #6 Reber • Concrete to be Class A-4.
1'6"� /each way • All reinforcing steel to meet the current
/ requirements of ASTM Spec. A-615.
r
6" thick concrete
apron extending oncrete apron
entire width of the on (nee notes)
structure
5' (min)
Trash Rack on Headwall
Plate bolted to
Pipe welded t
min Ye " clearance around at,
Pipe welded to trash
min clearance around steel
plate bolted to
Pipe welded to trash re
min clearance arot
steel rod
Min steel rod
Mounting hole for V " bolt
SIDE PINT DETAIL
lounting hole for bolt
Min steel rod
`Pipe welded to trash rack
Pipe welded to plate 3" min 1/6 " clearance around steel rod
min ye " clearance around
steel rod TOP HINGE DETAIL
DEBRIS CAGE MOUNTING DETAILS
NO SCALE
CONTRACTOR SHALL NOTIFY THE TIMMONS GROUP PRIOR TO
COMMENCEMENT OF CONSTRUCTION OF BMP PRACTICES
INCLUDING THE THREE BIORETENTION FILTERS AND THE
STORMTECH DETENTION SYSTEM WITH ISOLATOR ROW. A
SPECIFIC PRECONSTRUCTION MEETING BETWEEN THE
CONTRACTOR, ENGINEER, INSPECTOR, AND MANUFACTURER IS
HIGHLY RECOMMENDED PRIOR TO INSTALLATION OF THESE
PRACTICES TO ENSURE THESE PRACTICES ARE NOT ONLY
INSTALLED CORRECTLY BUT ALSO DOCUMENTED THROUGHOUT
CONSTRUCTION. IT IS THE CONTRACTORS SOLE RESPONSIBILITY
TO DOCUMENT THE INSTALLATION OF THESE PRACTICES AND IF
THEY PROCEED WITH DOING SO IT IS DONE AT THEIR OWN RISK.
CONTRACTOR SHALL TAKE NOTES, PICTURES, AND
MEASUREMENTS OF ALL STRATA LAYERS WITHIN THE
BIORETENTION FACILITIES DURING CONSTRUCTION. IT IS HIGHLY
RECOMMENDED TO TAKE PICTURES OF EACH MEASUREMENT OF
EACH STRATA LAYER OF EACH FACILITY. WITHOUT
DOCUMENTING TO THIS LEVEL OF DETAIL THE CONTRACTOR
RUNS THE RISK OF DIGGING THE FACILITIES BACK UP TO PROVE
THE CORRECT SECTIONS WERE INSTALLED.
106
24" NYLOPLAST BASIN
WITH DOME GRATE
TOP = 681.00
RAMP SOIL TO LIP OF
OVERFLOW STRUCTURE
MIN SLOPE 31
BOTTOM OF
BIORETENTION
BASIN 680.50
ELEV.675.75
SCHEDULE40 MIRAFI 140N FILTER
PVC UNDERDRAIN FABRIC OR EQUIVALENT.
DAYLIGHTED ON SITE TO BE 2' WIDE
SEE SHEET C5.0 CENTERED ON
UNDERDRAIN
NOTES
1. 36" BIOFILTER MEDIA DEPTH SHALL BE THE MINIMUM DEPTH AFTER A SETTLING
PERIOD OF THREE DAYS.
BIORETENTION FILTER 2A DETAIL (LEVEL 2)
NO SCALE
24" NYLOPLAST BASIN
CLEANOUT WITH DOME GRATE
TOP = 685.75
RAMP SOIL TO LIP OF
OVERFLOW STRUCTURE
MIN SLOPE 31
"j
BOTTOM OF
BIORETENTION
BASIN 685.25
3" HARDWOOD BARK MULCH
BOTTOM ELEV 685.00
36" BIOFILTER MIX
BOTTOM ELEV 682.00
3" NO. 8 STONE
BOTTOM ELEV 681.75
15" NO. 57 STONE
1 " 5 HDP E
V. OUT = 681
ELEV.680.75
SEE CLEANOUT
DETAIL SHEET C1.1
4"PERFORATED
SCHEDULE40
PVC UNDERDRAIN
TO BE 2' WIDE
CENTERED ON
UNDERDRAIN
NOTES
1. 36" BIOFILTER MEDIA DEPTH SHALL BE THE MINIMUM DEPTH AFTER A SETTLING
PERIOD OF THREE DAYS.
BIORETENTION FILTER 2C DETAIL (LEVEL 2)
NO SCALE
CLEANOUT
3" HARDWOOD BARK MULCH
BOTTOM ELEV 683.25
36" BIOFILTER MIX
BOTTOM ELEV 680.25
3" NO. 8 STONE
BOTTOM ELEV 680.00
15" NO. 57 STONE
310
24" NYLOPLAST BASIN
WITH DOME GRATE
TOP = 684.00
RAMP SOIL TO LIP OF
OVERFLOW STRUCTURE
MIN SLOPE 31
BOTTOM OF
BIORETENTION
BASIN 683.50
ELEV.678.75
SEE CLEANOUT
DETAIL SHEET C1.1
4" PERFORATED
SCHEDULE40
PVC UNDERDRAIN MIRAFI 140N FILTER
FABRIC OR EQUIVALENT.
TO BE 2' WIDE
CENTERED ON
UNDERDRAIN
NOTES
1. 36" BIOFILTER MEDIA DEPTH SHALL BE THE MINIMUM DEPTH AFTER A SETTLING
PERIOD OF THREE DAYS.
BIORETENTION FILTER 3A DETAIL (LEVEL 2)
NO SCALE
OR APPROVED EQUAL
Overflow
Orifices
C
31A inch Holes
Aluminum
l
Flat Washer
A
•
(6 Places)
�!
B
1.75 in x 25 in
/r Slainless Steel Screw
Outlet
•
�.
_
"'���///
/ [6 Places)
Pipe
• • 1 1
/
A DlArnerER < 15" _ 18" < 24"
Plastic Wall
0
g HEIGHT 24 30" 36"
Anchor
(6 Places)
®�
C WIDTH 23" 28" 34"
3/8 inch Holes
AEF
STANDARD DETAIL FOR
TRASHGUARD
FLAT BOTTOM CATCH BASINS
1-800-448-3636
PRETREATMENT
DEVICE BIOFILTER 2C - INSTALL IN STIR 238
OVER EXITING PIPE 237
NO SCALE
V M 1) 0
VMDO Architects
vmdo.com
434.296.5684
200 E Market Street 2000 Pennsylvania Ave NW Ste 7000
Charlottesville, VA 22902 Washington, DC 20006
0 00090
0 0 �0
TIMMONS GROUP
YOUR VISION ACHIEVED THROUGH OURS.
•
bemarle County
Public Schools
ALBEMARLE COUNTY PUBLIC SCHOOLS
CROZET ELEMENTARY
SCHOOL ADDITION,
RENOVATION AND SITE
IMPROVEMENTS
1407 Crozet Avenue, Crozet, VA 22932
VDOE Project Number 002-34-00-101
VMDO Project Number 1284
lifyd0 D l,1CROcki
lac. No. 53741
Checked By
Designed By
Drawn By
B. CICHOCKI
K. ROESER
K. ROESER
ISSUES AND REVISIONS
NO.
SUBMITTAL
DATE
1
FINAL SITE PLAN & WPO PLAN SUBMISSION
10.AUG.2020
2
FINAL SITE PLAN RESUBMISSION #1
25.NOV.2020
3
WPO PLAN RESUBMISSION #1
02.DEC.2020
4
FINAL SITE PLAN & WPO PLAN SUBMISSION
05.FEB.2021
5
SIGNATURE SET
18.MAR.2021
6
WPO AMENDMENT #1
28.MAY.2021
7
WPO AMENDMENT #2
24.AUGUST.2022
8
MINOR SITE PLAN AMENDMENT #1
24.AUGUST.2022
STORMWATER
MANAGEMENT
QUALITY
C6m2
Drainage Area A
Drainage Area A Land Cover (acres)
A Soils
B Soils
C Soils
D Soils
Totals
Land Cover Rv
Forest/Open Space (acres)
0.00
0.00
Managed Turf (acres)
0.09
0.09
0.20
Impervious Cover (acres)
0.03
0.03
0.95
Total
0.12
Drainage Area B
Drainage Area A Land Cover (acres)
A Soils
B Soils
C Soils
D Soils
Totals
Land Cover Rv
Forest/Open Space (acres)
0.00
0.00
Managed Turf (acres)
1.50
1.50
0.20
Impervious Cover (acres)
1.95
1.95
0.95
Total
7 3.45
Total Phosphorus Available for Removal in D.A. A (Ib/yr) 0.11
Post Development Treatment Volume in D.A. A (ft3) 169
otal Phosphorus Available for Removal in D.A. B (lb/yr) 4.91
Post Development Treatment Volume in D.A. B (ft) 7,814
6.a. Bioretention #1 or Micro-Bioretention #1
40
0
0
0
0
25
0.00
0.00
0.00
0.00
or Urban Bioretention (Spec #9)
6.b. Bioretention #2 or Micro-Bioretention #2
80
0.43
0.33
1,379
2,264
566
2,830
50
0.52
0.91
1.29
0.14
(Spec #9)
14. Manufactured Treatment Devices
14.a. Manufactured Treatment Device
0
0
0
0
0
20
0.00
0.00
0.00
0.00
Hydrodynamic
14.b. Manufactured Treatment Device -Filtering
0
0.40
0
0
1,379
1,379
40
0.00
0.87
0.35
0.52
14.c. Manufactured Treatment Device -Generic
0
0.61
1.22
0
0
4,650
4,650
40
0.00
2.92
1.17
1.75
Drainage Area C
CLEAR .AREAS
Drainage Area A Land Cover (acres)
A Soils
B Soils
C Soils
D Soils
Totals
Land Cover Rv
Forest/Open Space (acres)
0.00
0.00
Managed Turf (acres)
0.63
0.63
0.20
Impervious Cover (acres)
0.72
0.72
0.95
Total
1.35
Fotal Phosphorus Available for Removal in D.A. C (lb/yr) 1.85
Post Development Treatment Volume in D.A. C (ft3) 2,940
TOTAL IMPERVIOUS COVER TREATED (ac) 0.00 AREA CHECK: OK.
TOTAL MANAGED TURF AREA TREATED (ac) 0.00 AREA CHECK: OK.
TOTAL RUNOFF REDUCTION IN D.A. A (ft3) 0
TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. A (lb/yr) 0.11
TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. A (lb/yr) 0.00
TOTAL PHOSPHORUS REMAINING AFTER APPLYING RUNOFF REDUCTION PRACTICES IN D.A. A (lb/yr) 0.11
SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS
TOTAL IMPERVIOUS COVER TREATED (ac) 1.95 AREA CHECK: OK.
TOTAL MANAGED TURF AREA TREATED (ac) 1.04 AREA CHECK: OK.
TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (lb/yr) 2.74
TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. B (lb/yr) 4.91
TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. B (lb/yr) 1.51
TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. B (lb/yr) 1.29
TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. B (lb/yr) 2.80
TOTAL PHOSPHORUS REMAINING AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. B (lb/yr) 2.11
6.b. Bioretention #2 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS
NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. B (lb/yr) 11.69
NITROGEN REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. B (lb/yr) 0.00
TOTAL NITROGEN REMOVED IN D.A. B (lb/yr) 11.69
4.a. Grass Channel A/B Soils (Spec #3) 20 0.13 0.14 0 115 462 577 15 0.00 0.36 0.12 0.25 6.b. Bioretention #2 TOTAL IMPERVIOUS COVER TREATED (ac) k__1.67 AREA CHECK: OK.
TOTAL MANAGED TURF AREA TREATED (ac) 0.13 AREA CHECK: OK.
4.b. Grass Channel C/D Soils (Spec #3) 10 0 0 0 0 15 0.00 0.00 0.00 0.00
4.c. Grass Channel with Compost Amended 20 0 0 0 0 15 0.00 0.00 0.00 0.00 TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (lb/yr) 2.74
Soils as per specs (see Spec #4)
TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. C (lb/yr)
1.85
6.a. Bioretention #1 or Micro-Bioretention #1
TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. C (lb/yr)
0.46
40
0
0
0
0
25
0.00
0.00
0.00
1
0.00
1
or Urban Bioretention (Spec #9)
TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. C (lb/yr)
0.34
6.b. Bioretention #2 or Micro-Bioretention #2
80
462
369
92
462
50
0.25
0.00
0.22
0.02
TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. C (lb/yr)
0.80
(Spec #9)
TOTAL PHOSPHORUS REMAINING AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. C (lb/yr)
1.05
14. Manufactured Treatment D.
,
.
14.a. Manufactured Treatment Device-
0
0
0
0
0
20
0.00
0.00
0.00
0.00
SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS
Hydrodynamic
14.b. Manufactured Treatment Device- Filtering
0
0
0
0
0
20
0.00
0.00
0.00
0.00
14.c. Manufactured Treatment Device -Generic
0
0.53
0
0
1,828
1,828
40
0.00
1.15
0.46
0.69
Drainage Area D
TOTAL IMPERVIOUS COVER TREATED (ac) 0.00 AREA CHECK: OK.
•. •
TOTAL MANAGED TURF AREA TREATED (ac)
0.00
AREA CHECK: OK.
. �.
Drainage Area A Land Cover (acres)
.............................................
TOTAL RUNOFF REDUCTION IN D.A. D (ft3)
0
A Soils
B Soils
C Soils
D Soils
Totals
Land Cover Rv
TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. D (lb/yr)
0.38
Forest/Open Space (acres)
0.00
0.00
1 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. D (lb/yr)
0.00
Managed Turf (acres)
0.40
0.40
0.20
TAIL PHOSPHORUS REMAINING AFTER APPLYING RUNOFF REDUCTION PRACTICES IN D.A. D (lb/yr)
0.38
Impervious Cover (acres)
0.09
0.09
0.95
'otal Phosphorus Available for Removal in D.A. D (lb/yr)
0.38
Total
0.49
Post Development Treatment Volume in D.A. D (ft3)
601
SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS
Site Results (Water Quality Compliance)
Area Checks
FOREST/OPEN SPACE (ac)
IMPERVIOUS COVER (ac)
IMPERVIOUS COVER TREATED (ac)
MANAGED TURF AREA (ac)
MANAGED TURF AREA TREATED (ac)
AREA CHECK
D.A. A
D.A. B
D.A. C
D.A. D
D.A. E
AREA CHECK
0.00
0.00
0.00
0.00
0.00
O K.
0.03
1.95
0.72
0.09
0.00
OK.
0.00
1.95
0.67
0.00
0.00
OK.
0.09
1.50
0.63
0.40
0.00
OK.
0.00
1.04
0.13
0.00
0.00
O K.
Site Treatment Volume (ft3) 13,1so
Runoff Reduction Volume and TP By Drainage Area
RUNOFF REDUCTION VOLUME ACHIEVED (ft3)
TP LOAD AVAILABLE FOR REMOVAL (lb/yr)
TP LOAD REDUCTION ACHIEVED (lb/yr)
TP LOAD REMAINING (lb/yr)
0
2,264
485
0
0
2,748
0.11
4.91
1.85
0.38
0.00
7.24
0.00
2.80
0.80
0.00
0.00
3.60
0.11
2.11
1.05
0.38
0.00
3.64
NITROGEN LOAD REDUCTION ACHIEVED (lb/yr)ll 0.00 11.69
Total Phosphorus
NOTE:
FINAL POST -DEVELOPMENT TP LOAD (lb/yr)
8.26
SITE PROVIDES TREATMENT BEYOND THE REQUIRED
TP LOAD REDUCTION REQUIRED (lb/yr)
2.95
LOAD REDUCTION TO ACCOUNT FOR THE REMOVAL OF
TP LOAD REDUCTION ACHIEVED (lb/yr)
3.60
AN EXISTING BIORETENTION TREATING PARKING AREA.
TP LOAD REMAINING (Ib/yr):
4.67
THE REMOVAL OF THE EXISTING BIORETENTION
REMAINING TP LOAD REDUCTION REQUIRED (lb/yr):
0.00 **
REQUIRES AN ADDITIONAL 0.64 LB/YR LOAD
** TARGET TP REDUCTION EXCEEDED BY 0.65 LB/YEAR *
REDUCTION THUS 0.65 LB/YR OVER THE REQUIREMENT
IS PROVIDED. SEE CALC. BOOK FOR FURTHER DETAILS.
Total Nitrogen (For Information Purposes)
THE OWNER RESERVES THE RIGHT TO APPLY THE
POST -DEVELOPMENT LOAD (lb/yr)
59.10
SURPLUS TREATMENT OF 0.01 LB/YR TO OTHER
NITROGEN LOAD REDUCTION ACHIEVED (lb/yr)
14.15
PROPERTIES WITHIN THE SAME HUC AND UNDER THE
REMAINING POST -DEVELOPMENT NITROGEN LOAD (lb/yr)
44.96
SAME OWNERSHIP PER 9VAC25-870-69-A.5
Bioretention Filter "2A"
Design Level 2
Soil Type B
Drainage Area
Rv
Impervious=
0.4
0.95
Managed Turf Bio=
0.26
0.20
Forest=
0
0.03
Total Drainage Area=
0.66
Rv=
0.65
Impervious/pervious ratio
61%
Water Quality Volume=
1960
CF
(1.25*(Rv)(A))/12
1.25
Tv From Upstream Practice=
512
CF
Total Required Volume T v=l
2472
CF
Storage Depth (ft)
Void Ratios
Ponding Depth=
0.5
1
Depth of Media Filter=
3
0.25
Stone Sump Depth
1.25
0.4
Total Storage Depth=
1.75
FT
Surface Area
Minimum Req= 1413 SF
Providedl 14741 SF
Total Volume Provided I2580 CF
Forebay Volume
Required Forebay Volume:
371
CF
Forebay Dimensions:
18'x21'
Provided Forebay Volume:
385
CF
BIORETENTION SIZING COMPUTATIONS
Bioretention Filter "2C"
Design Level 2
Soil Type B
Drainage Area
Rv
Impervious=
0.33
0.95
Managed Turf Bio=
0.17
0.20
Forest=
0
0.03
Total Drainage Area=
0.5
Rv=
0.70
Impervious/pervious ratio
66%
Water Quality Volume=
1577
CF
(1.25*(Rv) (A) )/ 12
1.25
Tv From Upstream Practice=
0
CF
Total Required Volume Tv=
1577
CF
Storage Depth (ft)
Void Ratios
Ponding Depth=
0.5
1
Depth of Media Filter=
3
0.25
Stone Sump Depth
1.25
0.4
Total Storage Depth=
1.75
FT
Surface Area
Minimum Req=J 901 SF
Providedl 9801 SF
Total Volume Provided 1 1715 CF
Forebay Volume
Required Forebay Volume:
1 23711CF
Forebay Dimensions:
I n/a, circular
Provided ForebayVolume:1
266
CF
Bioretention Filter "3A"
Design Level 2
Soil Type B
Drainage Area
Rv
Impervious=
0.14
0.95
Managed Turf Bio=
0.13
0.20
Forest=
0
0.03
Total Drainage Area=
0.27
Rv=
0.59
Impervious/pervious ratio
52%
Water Quality Volume=
721
CF
(1.25*(Rv)(A))/12
1.25
Tv From Upstream Practice=
-117
CF
Total Required Volume Tv=
604
CF
Storage Depth (ft)
Void Ratios
Pending Depth=
0.5
1
Depth of Media Filter=
3
0.25
Stone Sump Depth
1.25
0.4
Total Storage Depth=
1.75
FT
Surface Area
Minimum Req=J 3451 SF
Providedl 350 SF
Total Volume Provided I613 CF
Forebay Volume
Required Forebay Volume:
1 911CF
Forebay Dimensions:
n/a
Provided F, durned
92
CF
V AA I
VMDO Architects
vmdo.com
434.296.5684
200 E Market Street 2000 Pennsylvania Ave NW Ste 7000
Charlottesville, VA 22902 Washington, DC 20006
Ile a
TIMMONS GROUP
YOUR VISION ACHIEVED THROUGH OURS.
bemarle County
Public Schools
ALBEMARLE COUNTY PUBLIC SCHOOLS
CROZET ELEMENTARY
SCHOOL ADDITION,
RENOVATION AND SITE
IMPROVEMENTS
1407 Crozet Avenue, Crozet, VA 22932
VDOE Project Number 002-34-00-101
VMDO Project Number 1284
Checked By B. CICHOCKI
Designed By K. ROESER
Drawn By K. ROESER
ISSUES AND REVISIONS
NO.
SUBMITTAL
DATE
1
FINAL SITE PLAN & WPO PLAN SUBMISSION
10.AUG.2020
2
FINAL SITE PLAN RESUBMISSION #1
25.NOV.2020
3
WPO PLAN RESUBMISSION #1
02.DEC.2020
4
FINAL SITE PLAN & WPO PLAN SUBMISSION
05.FEB.2021
5
SIGNATURE SET
18.MAR.2021
6
WPO AMENDMENT #1
28.MAY.2021
7
WPO AMENDMENT #2
24.AUGUST.2022
8
MINOR SITE PLAN AMENDMENT #1
24.AUGUST.2022
STORMWATER
MANAGEMENT
QUALITY
L
BIORETENTION FILTER 2A NOTES: BIORETENTION FILTER 2C NOTES: BIORETENTION FILTER 3A NOTES:
TWO FORMS OF PRETREATMENT PROVIDED TWO FORMS OF PRETREATMENT PROVIDED TWO FORMS OF PRETREATMENT PROVIDED
BY GRAVEL FLOW SPREADER AND UPSTREAM BY GRAVEL FLOW SPREADER AND UPSTREAM BY GRAVEL FLOW SPREADER AND UPSTREAM
BY ISOLATOR ROW OF STORMTECH BY AN ACF TRASH GUARD CATCH BASIN BY A GRASS SWALE DIRECTING THE
DETENTION SYSTEM. FILTER. DRAINAGE AREA TO THE PRACTICE.
C63