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VIRGINIA
GLENMORE GROUND STORAGE TANK
VSMP APPLICATION
OWNER: COUNTY OF ALBEMARLE & EAST RIVANNA VOLUNTEER FIRE COMPANY
DEVELOPER: ALBEMARLE COUNTY SERVICE AUTHORITY
TAX MAP & PARCEL: 093A1-00-00-00200
LIST OF PARCELS AFFECTED: 093A1-00-00-0400
07900-00-00-025AO
07900-00-00-025BO
ZONING DISTRICT: NEIGHBORHOOD MODEL DISTRICT
THE PROPERTY IS SUBJECT TO PROFFERS
ASSOCIATED WITH ZMA 2001-8 RIVANNA
VILLAGE AT GLENMORE AND A CODE OF DEVELOPMENT
MAGISTERIAL DISTRICT: SCOTTSVILLE
EXISTING USE: FIRE STATION
PROPOSED USE: WATER STORAGE TANK, PUMP STATION, AND FIRE STATION
010 TH. op k
CHARLES FRANK VOTAVA
Lic. No. 034916 W
ION�1L��
PREPARED BY:
9 PUMP STATION,
AND WATER MAIN PROJECT
AT EAST RIVANNA FIRE STATION
ACSA PROJECT NUMBER 2013=04
CD PROJECT NUMBER: SDP 2014=54
MAJOR SITE PLAN AMENDMENT TO SDP 1992=4
WPO 201400084
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LOCATION MAP
SCALE: 1 " = 750'
GLENMORE SUBDIVISION
TAX MAPS: 093A1 8c 079
NOVEMBER 2014
INDEX OF DRAWINGS
CUCOVER SHEET
SWM1 STORM WATER MANAGEMENT NOTES
SWM2 STORM WATER MANAGEMENT PLAN CALCULATIONS
(S%V)M3 STORM WATER MANAGEMENT PLAN CALCULATIONS
APPROVED
by the Albemarle County
Community D velo, mfjnt Department
Date_____�i �i l�-iY
File Wk t�"�ifl (Yr
STORM WATER MANAGMENT
PLAN
GUIDELINES - INSTALLATION, CONSTRUCTION AND
MAINTENANCE
BIORETENTION COMPONENTS
1. BIORETENTION FACILITY TO CAPTURE AND INFILTRATE STORMWATER; AREA IS APPROXIMATELY 472 SQUARE FEET.
2. BIORETENTION FACILITY UNDERDRAIN SYSTEM; THE PERFORATED PIPE UNDER THE BIORETENTION AREA IS
APPROXIMATELY 30 LINEAR FEET AND THE SOLID PIPE THAT TRANSPORTS WATER FROM THE BIORETENTION
AREA TO THE OUTFALL LOCATION IS APPROXIMATELY 46 FT. BOTH PIPES ARE 6—INCHES IN DIAMETER.
3. GRASS SWALES TRANSPORTING RUNOFF TO THE BIORETENTION FACILITY; THE SWALES ARE APPROXIMATELY 240
LINEAR FEET.
DEFINITIONS
• BIOSOIL MEDIA — A SPECIALLY BLENDED STATE —APPROVED BIORETENTION MIXTURE OF SAND, TOP SOIL AND
COMPOST DESIGNED TO SUPPORT CONTINUAL PLANT LIFE, RETAIN AN INFILTRATION RATE OF PREFERABLY 2
INCHES PER HOUR, AND FILTER KEY POLLUTANTS FROM TYPICAL URBAN STORMWATER RUNOFF. KEY
POLLUTANTS INCLUDE PHOSPHORUS, NITROGEN, METALS, AND PETROLEUM PRODUCTS.
• BMP — STORMWATER BEST MANAGEMENT PRACTICE THAT IS DESIGNED TO CONTROL STORMWATER QUANTITY
AND/OR QUALITY.
• UNDERDRAIN — SLOTTED OR PERFORATED PIPING THAT LIES BENEATH AN INFILTRATION BMP DRAIN FIELD AND IS
DESIGNED TO DRAIN WATER FROM THE BMP AFTER IT HAS BEEN FILTERED BY OVERLYING MATERIALS.
UNDERDRAINS CAN BE PLACED TO RAPIDLY REMOVE ALL INFILTRATED STORMWATER OR TO ALLOW SOME
STORMWATER TO MIGRATE TO A LOWER CHAMBER THEREBY FORCING A CERTAIN QUANTITY TO INFILTRATE TO
NATIVE SOILS, SUCH AS FOR GROUNDWATER RECHARGE.
CONSTRUCTION AND INSTALLATION
A DESCRIPTION OF THE COMMON MATERIALS REQUIRED TO CONSTRUCT AND INSTALL BIORETENTION FACILITIES IS
PRESENTED IN TABLE 1. THE SPECIFICATIONS FOR THE BIOSOIL MEDIA ARE PRESENTED IN TABLE 2. ADDITIONAL
GUIDELINES CONCERNING BIORETENTION FACILITY MATERIALS AND PLACEMENT ARE GIVEN BELOW:
• BIORETENTION FACILITIES SHOULD BE CONSTRUCTED AFTER THE DRAINAGE AREA TO THE FACILITY IS COMPLETELY
STABILIZED. EROSION AND SEDIMENT CONTROLS FOR
• ALL MATERIALS ARE TO BE INSPECTED AND COMPARED TO THE PLAN SPECIFICATIONS PRIOR TO INSTALLATION.
ANY MATERIALS NOT MEETING PLAN SPECIFICATIONS SHOULD BE REJECTED AND REPLACED WITH SUITABLE
MATERIALS.
• STONE AND GRAVEL SHALL BE WASHED UNTIL LESS THAN 1 PERCENT PASSES THE #200 SIEVE.
• EXCAVATION OF THE BIORETENTION FACILITY SHOULD BE COVERED WITH PLASTIC SHEETING OR OTHER MATERIAL
AT THE END OF THE WORK DAY, OR WHEN IT RAINS, TO INHIBIT THE COLLECTION AND INFILTRATION OF
PRECIPITATION. THIS REQUIREMENT MUST BE MET UNTIL AT LEAST THE GEOTEXTILE AND STONE ARE
INSTALLED PROPERLY AND IS FULLY FUNCTIONAL AS DESIGNED.
TABLE 1: BIORETENTION FACILITY COMPONENTS
Component
Material
Additional Information
Planting Sall
Homogeneous
® Mixture must be State approved
mixture of sails
« The components of the soil ,should be mixed at
a batch cell prior to delivery to the site.
0 The soil media should be slightly moistened, as
necessary, to prevent Separation during
installation
• See additional design guidelines for soil media
in the narrative below.
Plants
0 Plants must be able to tolerate highly variable
moisture conditions, generally dry, with brief
periods of inundation.
Plants must be able to tolerate exposure to
Wind and sun, as Well as salt and toxins in
runoff from roads; parking lots, and driveways.
Use of native plant species is preferred.
• See additional E sidelines for �l
8 ants below.
Mulch
fine shredded
Mulch is well aged when it has been stockpiled
hardwood mulch
or stored for 6 to 12 months.
Mulch should be uniform in color and free of
foreign material ,
including lent material.
Underdrain System and
6 inch, Schedule 40;
3/8 inch perforations with each row of
Cleanout
or better polyvinyl
perforations containing at least 6 holes.
perforated and solid
• Max spacing between rows of perforation shall
pipe
be 6-inches and the minimum slope of the
pipe should be 1 .
Low Permeability
Needled, non--
Must meet the fallowing specifications
Geotextile
woven,
o Grab Tensile Strength (ASTM D4632):
polypropylene
>120 lbs
geotextile meeting
o Mullen Burst Strength (ASTM D3786);
criteria in Additional
>225 lbs/in2
Information
o Apparent Opening Size (ASTM D4751):
US #100 sieve
Lines the outside of the bioretention facility to
block migration of native files (material that
can pass the #200 sieve) into the facility
Filter Media
VDOT #3, #8, or #89
Material between soil media and dnderdrain
Pea Gravel
stone layer
Stone
VQOT #57 Stone
• Homogeneous stank layer with stone at least 6
inches above and 6 inches below the
u nd erd ra in
5
Service A , uth6rity
'i
SEQUENCE OF CONSTRUCTION
ROUGH EXCAVATION OF THE BIORETENTION AREA MAY BE SCHEDULED WITH THE ROUGH GRADING OF THE PROJECT
TO PERMIT USE OF THE EXCAVATED MATERIAL AS FILL ELSEWHERE ON THE SITE. HOWEVER, THE BIORETENTION
AREA MUST NOT BE CONSTRUCTED OR PLACED IN SERVICE UNTIL THE ENTIRE CONTRIBUTING DRAINAGE AREA HAS
BEEN STABILIZED. THE LOCATIONS OF BIORETENTION AREAS MUST NOT BE USED FOR SEDIMENT AREAS FOR EROSION
AND SEDIMENT PROTECTION DURING SITE CONSTRUCTION. THE SEQUENCE OF CONSTRUCTION SHALL BE AS FOLLOWS:
1. INSTALL THE EROSION AND SEDIIMENT CONTROL MEASURES FOR THE SITE.
2. GRADE EACH SITE TO ELEVATIONS SHOWN ON PLAN. INITIALLY, THE FLOOR MAY BE EXCAVATED TO WITHIN
ONE FOOT OF ITS FINAL ELEVATION. EXCAVATION TO FINISHED GRADE SHALL BE DEFERRED UNTIL ALL
DISTURBED AREAS WITHIN THE WATERSHED HAVE BEEN STABILIZED AND PROTECTED.
3. COMPLETE CONSTRUCTION ON THE WATERSHED AND STABILIZE ALL AREAS DRAINING TO THE BIORETENTION
AREA.
4. REMOVE ALL ACCUMULATED SEDIMENT AND EXCAVATE BIORETENTION AREA TO PROPOSED DEPTH. USE
RELATIVELY LIGHT, TRACKED EQUIPMENT TO AVOID COMPACTION OF THE FLOOR. AFTER FINAL GRADING IS
COMPLETED, DEEPLY TILL THE FLOOR WITH ROTARY TILLERS OR DISC HARROWS TO PROVIDE A
WELL —AERATED, HIGHLY POROUS SURFACE TEXTURE.
5. INSTALL THE LOW PERMEABILITY GEOTEXTILE IN ACCORDANCE WITH THE PLANS.
6. INSTALL THE PERFORATED UNDERDRAIN, INFILTRATION STONE, AND PEA GRAVEL IN ACCORDANCE WITH THE
SPECIFICATIONS AND DIRECTIONS. LIGHTLY COMPACT WITH A LANDSCAPING ROLLER.
7. AFTER CONFIRMATION THAT SOIL MEETS SPECS BY PERFORMING THE REQUISITE GRADATION AND CHEMICAL
TESTS, FILL BIORETENTION AREA WITH PLANTING SOIL, AS SHOWN IN THE PLANS AND DETAILED BELOW. THE
BIORETENTION SOIL SHOULD NOT BE COMPACTED.
8. INSTALL THE MULCH AND VEGETATION SPECIFIED IN THE PLANTING PLAN FOR BIORETENTION AREA.
9. PLACE SOD IN UPSTREAM GRASS SWALE AND THE DOWNSTREAM EMBANKMENT.
10. UPON AUTHORIZATION FROM DESIGNATED INSPECTOR, REMOVE ALL SEDIMENT CONTROLS AND STABILIZE ALL
DISTURBED AREAS.
BIORETENTION AREA SOIL SPECIFICATIONS
PLANTING SOIL
• THE SOIL MUST BE A STATE APPROVED MIX.
• THE BIORETENTION AREAS SHALL CONTAIN A PLANTING SOIL MIXTURE OF 50% SAND, 30% LEAF COMPOST (FULLY
COMPOSTED, NOT PARTIALLY ROTTED LEAVES), AND 20% TOPSOIL. TOPSOIL SHALL BE SANDY LOAM OR
LOAMY SAND OF UNIFORM COMPOSITION, CONTAINING NO MORE THAN 5% CLAY, FREE OF STONES, STUMPS,
ROOTS, OR SIMILAR OBJECTS GREATER THAN ONE INCH, BRUSH, OR ANY OTHER MATERIAL OR SUBSTANCE
WHICH MAY BE HARMFUL TO PLANT GROWTH, OR A HINDRANCE TO PLANT GROWTH OR MAINTENANCE.
• THE TOP SOIL SHALL BE FREE OF PLANTS OR PLANT PARTS OF BERMUDA GRASS, QUACK GRASS, JOHNSON
GRASS, MUGWORT, NUTSEDGE, POISON IVY, CANADIAN THISTLE OR OTHERS AS SPECIFIED. IT SHALL NOT
CONTAIN TOXIC SUBSTANCES HARMFUL TO PLANT GROWTH.
• THE BIORETENTION SOIL SHALL BE TESTED AND MEET THE FOLLOWING CRITERIA:
TABLE 2: BIORETENTION SOIL CRITERIA
SOURCE: VIRGINIA STORMWATER MANAGEMENT HANDBOOK
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THE FOLLOWING TESTING FREQUENCIES SHALL APPLY TO THE ABOVE SOIL CONSTITUENTS:
PH, ORGANIC MATTER: 1 TEST PER 90 CUBIC YARDS, BUT NO LESS THAN 1 TEST PER BIORETENTION AREA
MAGNESIUM, PHOSPHORUS, POTASSIUM, SOLUBLE SALTS: 1 TEST PER 500 CUBIC YARDS, BUT NO LESS
THAN 1 TEST PER BORROW SOURCE
ONE GRAIN SIZE ANALYSIS SHALL BE PERFORMED PER 90 CUBIC YARDS OF PLANTING SOIL, BUT NO LESS
THAN 1 TEST PER BIORETENTION AREA. SOIL TESTS MUST BE VERIFIED BY A QUALIFIED PROFESSIONAL.
MULCH
• AREAS SHOULD BE MULCHED ONCE TREES AND SHRUBS HAVE BEEN PLANTED. ANY GROUND COVER SPECIFIED AS
PLUGS MAY BE INSTALLED ONCE MULCH HAS BEEN APPLIED.
• THE MULCH LAYER SHOULD CONSIST OF STANDARD LANDSCAPE FINE SHREDDED HARDWOOD MULCH.
• MULCH SHALL BE FREE OF WEED SEEDS, SOIL, ROOTS, OR ANY OTHER SUBSTANCE NOT CONSISTING OF EITHER
BOLE OR BRANCH WOOD AND BARK.
• THE MULCH SHALL BE UNIFORMLY APPLIED APPROXIMATELY 2.5 INCHES IN DEPTH.
• INSTALLATION SHOULD BE PERFORMED BY A PROFESSIONAL LANDSCAPE CONTRACTOR.
PLANT MATERIAL GUIDELINES
PLANT MATERIAL SOURCE
• THE PLANT MATERIAL SHOULD CONFORM TO THE CURRENT ISSUE OF THE AMERICAN STANDARD FOR NURSERY
STOCK PUBLISHED BY THE AMERICAN ASSOCIATION OF NURSERYMEN.
• PLANT MATERIAL SHOULD BE SELECTED FROM CERTIFIED NURSERIES THAT HAVE BEEN INSPECTED BY STATE OR
FEDERAL AGENCIES.
• THE BOTANICAL (SCIENTIFIC) NAME OF THE PLANT SPECIES SHOULD BE IN ACCORDANCE WITH A STANDARD
NOMENCLATURE SOURCE SUCH AS BIRR, 1975.
• TREES SHOULD BE A MINIMUM OF ONE INCH CALIPER. SHRUBS SHOULD BE A MINIMUM OF TWO —GALLON
CONTAINER SIZE AND HERBACEOUS PLANS SHOULD BE A MINIMUM OF SIX INCH DIAMETER CONTAINER SIZE.
• ALL PLANT MATERIALS SHOULD BE TAGGED FOR IDENTIFICATION WHEN DELIVERED.
INSTALLATION
• BALLED AND BURLAPPED
AND
CONTAINERIZED
TREES AND SHRUBS SHOULD BE PLANTED DURING THE FOLLOWING
PERIODS: MARCH 15
THROUGH
JUNE 30
AND SEPTEMBER 15 THROUGH NOVEMBER 15.
• THE PLANTING OF TREES
AND
SHRUBS SHOULD
BE PERFORMED BY FOLLOWING THE PLANTING SPECIFICATIONS
SET FORTH IN MS 3.05,
LANDSCAPING.
MS 3.05 SPECIFICATIONS PROVIDE GUIDELINES THAT INSURE THE
PROPER PLACEMENT
AND
INSTALLATION
OF PLANT MATERIAL.
DESIGNED: ZMC VSMP APPLICATION
DRAWN: JLB ACSA PROJECT No. 2013-04
CD PROJECT No. SDP 2014-54
CHECKED: CFV No. DATE REVISION MAJOR SITE PLAN AMEND. TO SDP 1992-4
Michael Baker Jr., Inc.
A Unit of Michael Baker International
'�' T 272 Bendix Road, Suite 400
Virginia Beach, Virginia 23452
INTERNATIONAL hon757-4636 050370 Fa
WARRANTIES
• THE CONTRACTOR SHALL MAINTAIN A ONE (1) CALENDAR YEAR 80% CARE AND REPLACEMENT WARRANTY FOR
ALL PLANTING.
• THE PERIOD OF CARE AND REPLACEMENT SHALL BEGIN AFTER INSPECTION AND APPROVAL OF THE COMPLETE
INSTALLATION OF ALL PLANTS AND CONTINUE FOR ONE CALENDAR YEAR.
• PLANT REPLACEMENTS SHALL BE IN ACCORDANCE WITH THE MAINTENANCE SCHEDULE.
BIORETENTION AREA PLANTING SPECIFICATIONS
• ROOT STOCK OF THE PLANT MATERIAL SHALL BE KEPT MOIST DURING TRANSPORT FROM THE SOURCE TO THE
JOB SITE AND UNTIL PLANTED.
• WALLS OF PLANTING PIT SHALL BE DUG SO THAT THEY ARE VERTICAL.
• THE DIAMETER OF THE PLANTING PIT MUST BE A MINIMUM OF SIX INCHES (6") LARGER THAN THE DIAMETER OF
THE BALL OF THE TREE.
• THE PLANTING PIT SHALL BE DEEP ENOUGH TO ALLOW 1 /8 OF THE OVERALL DIMENSION OF THE ROOT BALL TO
BE ABOVE GRADE. LOOSE SOIL AT THE BOTTOM OF THE PIT SHALL BE TAMPED BY HAND.
• THE APPROPRIATE AMOUNT OF FERTILIZER IS TO BE PLACED AT THE BOTTOM OF THE PIT.
• THE PLANT SHALL BE REMOVED FROM THE CONTAINER AND PLACED IN THE PLANTING PIT BY LIFTING AND
CARRYING THE PLANT BY ITS BALL (NEVER LIFT BY BRANCHES OR TRUNK).
• SET THE PLANT STRAIGHT AND IN THE CENTER OF THE PIT SO THAT APPROXIMATELY 1 /8 OF THE DIAMETER OF
THE ROOT BALL IS ABOVE THE FINAL GRADE.
• BACKFILL PLANTING PIT WITH EXISTING SOIL.
• MAKE SURE PLANT REMAINS STRAIGHT DURING BACKFILLING PROCEDURE.
• NEVER COVER THE TOP OF THE BALL WITH SOIL. MOUND SOIL AROUND THE EXPOSED BALL.
• TREES SHALL BE BRACED BY USING 2" BY 2" WHITE OAK STAKES. STAKES SHALL BE PLACED PARALLEL TO
WALKWAYS AND BUILDINGS. STAKES ARE TO BE EQUALLY SPACED ON THE OUTSIDE OF THE TREE BALL.
UTILIZING HOSE AND WIRE THE TREE IS BRACED TO THE STAKES.
• BIORETENTION AREA PLANTS SHOULD NOT REQUIRE CHEMICAL FERTILIZATION.
MAINTENANCE/INSPECTION GUIDELINES
REGULAR INSPECTIONS SHOULD BE COMPLETED ON A MONTHLY BASIS FOR THE FIRST SIX MONTHS AFTER
INSTALLATION. THEREAFTER, THE FACILITY SHOULD BE INSPECTED EVERY 6 MONTHS. A SAMPLE MAINTENANCE
SCHEDULE CAN BE FOUND IN TABLE 3. THIS OR A SIMILAR PLAN SHOULD BE IMPLEMENTED FOR THE PROJECT.
PLANTING SOIL
• IT IS RECOMMENDED THAT THE APPLICATION OF ALKALINE, SUCH AS LIMESTONE, BE CONSIDERED ONCE TO TWICE
A YEAR. TESTING OF THE PH OF THE ORGANIC LAYER AND SOIL, SHOULD PRECEDE THE LIMESTONE
APPLICATION TO DETERMINE THE AMOUNT OF LIMESTONE REQUIRED.
• SOIL TESTING SHOULD BE CONDUCTED ANNUALLY SO THAT THE ACCUMULATION OF TOXINS AND HEAVY METALS
CAN BE DETECTED OR PREVENTED. OVER A PERIOD OF TIME, HEAVY METALS AND OTHER TOXIC SUBSTANCE
WILL TEND TO ACCUMULATE IN THE SOIL AND THE PLANTS. THE PREVENTATIVE MEASURES WOULD INCLUDE
THE REMOVAL OF THE CONTAMINATED SOIL. IN SOME CASES, REMOVAL AND DISPOSAL OF THE ENTIRE SOIL
BASE AS WELL AS THE PLANT MATERIAL MAY BE REQUIRED.
• THE SOIL LAYER SHOULD BE INSPECTED FOR AREAS OF EROSION AND MATERIAL REPLACED AS NEEDED.
PLANT MATERIALS
• THE MULCH LAYER SHOULD BE INSPECTED FOR AREAS OF EROSION AND MATERIAL REPLACED AS NEEDED.
• THE ENTIRE MULCH LAYER SHOULD BE REPLACED EVERY TWO TO THREE YEARS IN THE SPRING. WHEN THE
MULCH LAYER IS REPLACED, THE PREVIOUS LAYER SHOULD BE REMOVED FIRST.
• PLANT MATERIAL UPKEEP INCLUDES ADDRESSING PROBLEMS ASSOCIATED WITH DISEASE OR INSECT INFESTATIONS,
REPLACING DEAD PLANT MATERIAL, AND ANY NECESSARY PRUNING.
TABLE 3: SAMPLE MAINTENANCE SCHEDULE
SOURCE: VIRGINIA STORMWATER MANAGEMENT HANDBOOK
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CHARLES FRANK VOTAVA
�oLic. No. 034916�
ICNAL
GLENMORE GROUND STORAGE TANK, PUMP STATION, AND WATER MAIN PROJECT (PROJECT NO. 2013-04)
STORM WATER MANAGEMENT NOTES
NOVEMBER 2014
TAX MAP
00791 SWM 1
ELEV OF 363.5
BJORETENTION SOIL LAYER 2'
PEA GRAVED. LAYER
UNDERDRAIN
CONNECTION TO
6" PVC PIPE
T�H' Or
CHARLES FRANK VOTAVA
Lic. No. 034916 W
TONAL
6' SOUD PVC PIPE. APED
(PLACE V A80VE SOIL)
STATE -APPROVER
BIORETENTION MIX
�"T" CONNECTION
6" DIAMETER PERFORATED UNDERDRAIN
AT 1% SLOPE.
LIMITS OF DISTURBANCE/LIMITS OF
CLEARING/LIMITS OF CONSTRUCTION
THE GEOTEXTILE SHOULD BE TIED
INTO THE EXISTING GROUND
WITH AT LEAST 2' OF GROUND
ABOVE THE GEOTEXTILE
VERTICAL SIOEWALLS
PROP. 12" DIP
WATER SUPPLY LINE
ELEV OF 363.5
GEOTEXTILE (ALONG
ROPOSED GROUND
ELEV OF 364.0 FT
ISURFACE STORAGE
BIOSOIL
PEA GRAVEL
TOTAL STORAGE=
DEPTH
VOID RATIO
VOLUME (FT3)
0.5
1
236
2
0.25
236
1 1
1 0.4
1 188.8
I
1
1 660.8
NOTE: THE BIORETENTION FACILITY WILL REDUCE THE FLOW RATE OF
GEOTEXTILE (ALONG BIDES) STORMWATER ENTERING THE STREAM FROM "DRAINAGE AREA A" AS A
RESULT OF A 1 YEAR 24 HOUR STORM EVENT FROM A PRE -DEVELOPMENT
FLOW RATE OF 0.08 CFS TO A POST -DEVELOPMENT FLOW RATE OF 0.02
CFS.
DIAMETER PERFORATED UNDERDRAIN
-
.............
... . ......
' -P GRAVEL TO BE GRADED
AIN'ibWARD GRASS SWALE
•
V.11)"
CRASS SWALE TYPICAL
CRASS SECTION
NOT TO SCALE
PROP -GRASS SWALE TAX MAP 093A1-00-00-00400
SEE CROSS-S€ETION RIVANNA VILLAGE LLC
L DETAIL, THIS SHEET 1 (D.B. 4375, PG. 410)
441
q,
PROP.PUM� I_(4) CEPHALANTHUS
'' P,-;,, .ATION \�q
\a`qq„QOCCfDENTAI�IS/BUTTON
BUSH
......
PROP. 30LF-
C I0 R ET" N F}�1�
WoW x4a e4
0
UNDERDRAI)
0
v�
f STA. 1 +24 �.
PROP. 18" �ONC. PROP. STORM
STORM', PIPE WATER MANHOLE :t��i��
124LF @ '2.2% TOP=370.5 '
---� _ _.LOPE_ _ _ _ INV. IN=367.0
.. ; 94 I I -INV. OUT=3- J - - - - - - ---I-----
6
r.
w
STA. q+00
/- - -
PROP.._. I DROP INL�T
I I K
TOP=�74.5
A/ / INV. QUT=369.5 i
I I I / / -
I
I I I DRAINAGE AREIA A BOUNPARY
I I I DRAINING TO blORETENTIQN FACILITY
AREA=0.44 ORES I
41 I I
I
I � 0
"Op
I
I� �a
2J. 1 0 20 40 Ft. SCALE: I I
TAX MAP 093A1-00-00-00200
EAST RIVANNA VOLUNTEER
FIRE CO. INCORPORATED
#3501 STEAMER DRIVE
(D.B. 1204, PG. 201) j
1 "=20' HORZI I
STORM WATER MANAGEMENT AND PLANTING PLAN
PLANT AND COMPOSITION SCHEDULE
BIORETENTION
SIZE ( acres ) :.009 AC (399 SF/14'x28.5')
OVERALL SPACING
(FEET OFF CENTER)
QUANTITY
PER ACRE
FREQUENCY
(%)
SPECIES
QUANTITY
BOTANICAL NAME
COMMON NAME
UNIT
10
520
17%
4
CEPHALANTHUS OCCIDENTALIS
BUTTONBUSH
30" HT.
2
2600
83%
25
RUDBECKIA HIRTA
BLACK-EYED SUSAN
QT.
NOTES:
1. CLUSTERING AND ARRANGEMENT OF THESE SPECIES TO BE COORDINATED WITH ACSA STAFF.
2. PLANT SPECIES ARE PER THE ALBEMARLE COUNTY RECOMMENDED PLANTS LIST.
3. VEGETATION SHALL ACHIEVE AT LEAST 75% COVERAGE WITHIN 2 YEARS OF THE BIORETENTION FACILITY BEING INSTALLED.
PROP. 18" CONC. �6RI-iv `PtflE
(20) RUBECKIA
HIRTA/BLACK-EYED
SUSAN
PROP. 29.5'x16' BIORETENTIO
FACILITY OUTLINE
INV. IN=364
SEE CROSS SECTION
DETAILS, THIS SHEET
20LF @ 2.2% SLOPjE
STA. 1 +44 _
INV. OUT=366.5 � _
PROP. 12.2 S.Y. PROP. 6" PVC
CLASS I DRY & RAP BIORETEN ON DRAIN
-_-__ -- P R ��_^_ PIPE EXT ND TO DAYLIGHT
UNDERLINING �` ��LF--� • 1 % SLOPE
DRAINAGE SUMMARY TABLE
STRUCTURE
NUMBER
DESCRIPTION
LENGTH
INVERT IN
INVERT OUT
SLOPE
REMARKS
1
DI-7
N/A
N/A
369.5
N/A
4' MANHOLE
2
18" RCP, CLASS (III
124'
N/A
N/A
2
N/A
3
MANHOLE
N/A
366.5
366.4
N/A
4' MANHOLE
4
18" RCP, CLASS III
56'
N/A
365.5
4
N/A
STORMWATER COMPUTATION AND BMP CALCULATIONS
OUTFALL
THE NATURAL TOPOGRAPHY OF THE SITE DROPS OFF IN THE SOUTH DIRECTION. THE RELATIVELY SMALL FLOW
RATES EXPECTED FROM THE UNDERDRAIN AND THE EMERGENCY SPILLWAY (DURING INFREQUENT STORM
EVENTS) SHOULD NOT RESULT IN EROSION OR ANY OTHER DOWNSTREAM ISSUES. A SOLID POLYVINYL PIPE
WILL CONNECT THE PERFORATED UNDERDRAIN PIPE TO THE OUTFALL LOCATION.
VEGETATED EMERGENCY SPILLWAY
THE PEAK FLOW RATE TO THE BIORETENTION AREA IS APPROXIMATELY 1.4 CFS DURING THE 100-YR OR
1-PERCENT-ANNUAL-CHANCE STORM EVENT. WHEN THE DEPTH OF WATER ABOVE THE BIORETENTION AREA
REACHES 0.5-FT, THE EMBANKMENT ON THE WEST SIDE OF THE BIORETENTION BASIN WILL ACT AS A
SPILLWAY ALLOWING WATER TO SPILL OVER THE SIDE AND DOWN THE EXISTING HILL. NO STRUCTURES ARE
FOUND IN THE IMMEDIATE AREA DOWNSTREAM OF THE EMBANKMENT.
GRASS SWALE
ONE (MAJOR AND TWO MINOR GRASS SWALES SHALL BE CONSTRUCTED TO CONVEY WATER FROM THE
IMPERVIOUS AREAS TO THE BIORETENTION AREA. THE GRASS SWALES WHICH WILL CONVEY FLOW TO THE
BIORETENTION FACILITY SHALL SERVE AS THE PRETREATMENT FOR FLOWS ENTERING THE FACILITY. THE SWALES
ARE SIZED USING MANNING EQUATION FOR THE 10-YR OR 10-PRECENT-ANNUAL-CHANCE STORM EVENT AND
WERE ANALYZED USING THE FLOWMASTER PROGRAM. THE MINIMUM DIMENSIONS ARE AS FOLLOWS:
BOTTOM WIDTH = 0.5 FT
TOP WIDTH = 3.5 FT
DEPTH = 0.45 FT MAX.
SIDE SLOPES = 3 TO 1
Site Data Summary
Total Rainfall = 43 inches
Site Land Cover GLIM nary
A Soils
B: Soils
C Sails
D'Soil:s
Total
°I of Total
Forest (acres)
0100
G.00
0.00
0100
0100
0.00
Turf (acres)
0.00
0'.00
0,00
0,34
0,34
77.27
Impervious (acres)
0.001
0.001
a001
0.20
0A0
22.73
0,44
100.00
Site Ry
O.41
Post Development Treatment Volume (ft3)
653
Post Development TP Load (lb/yr)
0.41
Post Developmcent TM Lead (lb/yr)
2.94
Total TP Load Reduction Required (Ib/yr)
u3
Total R€a'noff Volume Reduction (ft)
261
0
Total TP Load Reduction Achieved (lb/yr)
Total TN Load Reduction ,Achieved (lb/yr)
2.9?
Adjusted Post Development TP Load (lb/yr)
0.11�
Remaining Phosphorous Load Reduction (Lblyr) Required
0,04
Drainage Area Summary
D.A. A
D.A. B
D.A. C
D.A. D
D.A. E
Total
Forest (acres)
0.00
0.00
0.00
0.00
0.00
0.00
Turf (acmes)
0.34
0100
0.00
GM
0100
0.,3.E
Irnperviotus (acres)
0,10
0.00
0.001
0.001
0.00
0.10
drainag,e Area Compliance Su€r€marV
D.A. A
D.A. B
D.A. C
D.A. a
D.A. E
Totai
TP Load Reel. (Iblyr)
0123
0100
0.00
O,aO
0100
0.23
TN Load Red. (ilia/yr)
2.93
0,00
0.00
0.00
0,00
2,93
Drainage Area A Summary
Lard Cover Surr€marV
A Soils
a Soils
C Soils
D Soils
Total
% of Total
Forest (acres,)
Mo
0.00
Mo
0100
0100
0.00
Turf (acres)
0.00
0.00
0100
0.34
0,34
77.27
Impervious (acres)
0.001
0.001
0,001
0,10
0!.101
22.73
BMP Selections
Practice Credit Area (acres) Downstream
Practice
Total Impervious Cover Treated (acres)
0.10
Total Turf .Area Treated (acres)
0,34
Total 7P Load Reduction Achieved: in D.A. A (lhjyr)
0,23
Total TN Load Reduction Achieved in D.A. A (lb/yr)
2,93
NOTE: THE ABOVE SUMMARY IS FROM THE LATEST VIRGINIA RUNOFF
REDUCTION METHOD SPREADSHEET.
Ot.441
F, £ f£ f
DESIGNED: zMc
VSMP APPLICATION
GLENMORE GROUND STORAGE TANK, PUMP STATION, AND WATER MAIN PROJECT tPROJECT N0. 2013-04
NOVEMBER
2014
t ��s; .....; .L,I
Service Auth6rity
DRAWN: J LB
ACSA PROJECT No. 2013-04
Michael Baker Jr., Inc.
'� iI® A Unit of Michael Bakers International
272 Bendix Road, Suite 400
T P
CD PROJECT No. SDP 2014-54
Virginia Beach, Virginia 23452
Phone: 757-463-8770
STORM WATER MANAGEMENT PLAN CALCULATIONS
093A1
W M 2
CHECKED: CFv
MAJOR SITE PLAN AMEND. TO SDP 1992-4
Fax: 757-463-0503
079
rN0.
DATE
REVISION
.13i,oretention Basit-i Design
F, a
'a er: a h PrOiect at Ea tt RiV :n ha Gfenm,ore Ground Star ge Tank Pump Stati"0:1111� dW t M 11 jr a on
0 A
ffi Q
sildretention surtaCe. Area (SA) Calculations
Existing
Total Dminage AFE-a
Impervious Area
Percent Impervious
Paruious Area -
Proposed
Torbeil Dfaim7tge Area-
Imperviou-z. Arc�-,a -
Pefcent Impervious' -
Per 'Vions Arco =
ft 19,166 -;5,q
4j47 sq ft.
21.6
15)0191 5q ft
<rneasured from (-,AD Drwtving>
<mrA-sured from CAD Dnowving>
<rnp_,asurp�,d from. CAD Drwvving>
<measurcad froliTiti., CAD.Dre-ming>
M i n-i mum Wkd th
Minimum Lengt1l)
Max Pondin,g, Depth =
Max PondinDepth =
Surface Area _-
Impearvi-ous Area=
Roof Are�a
D r Ivt,%va, y
Bi orete ntio n: Area =
Biorr--tAtn.tion Area =
r6 ft
29.5 ft
0.5 ;ot_
1 ft
472 sq ft
Al 47. q ft
3,521.00 sq ft
6 026.00 sq ft
Impervus Araa * 5%
S,ee Runiooff Caletst, Sh4_,�t
ts hhL.st'llteFor widhgreatertan 20t,, thelenghsouldaat 1eal. VICe thewidth'to aow dispersedsheeet flovv
.1
Without an undndrain
W n 1 t an iz.4 nderdra[n
20735 -sq ft 3.11-14;-
4,67.75 -sq, ft < - e:taaln 1.0 in of runoftt,
Siting
ShroWd IDS t l��;;_0[20 ft id own.shop-s from any bufflding.-
Ei:hu�ijld be lace— in are- to promute p, blic: invralvement
2-4, ft requIred betuv-len: the 10-cill-tram of thefaciflity and the wab.-_--r tabh-_/be---dn ck
3654.uu�� Gramp-
36150, Topof Mulch
3 62, , 2 - 5 9 o t t o IF
o f M u h I T c,,� p -. of i 1
3 -0 1.25 Botto m of Soj 1,1To p of Pea G rave,
360.2'5, Bo om of Pea Grave[/Top of Underdrain Layer
3 ,3 fU L 0 To p ot. n
360:50 Bo rim of Un4erdrajn Pipe (Upstream)
3 75('�-j2 OJO-RE tc'J m : ra f U n de r 'frail . i p ge If. D o w n - s tr e.. arm.) 156.FDO
0.5 Ponding C)e.pth
C�,arnponents,
liVA 0C.R. Stor.m.wafer Dosign Speoftation No.. 0 611ore-tentlon
rvi u I c h
3 f r, c rhes de a p,
'4nsni
eetp D�ee st .t:th;, ri1' om d stP, aAraln hrol �nt:Ot1U dc ( I t bA
2. ftcl)ilist ad rreerten.P-Contr-RssiitoS�eTa )
-cr-a
'llieref-bre, -the Level I.Mloret-.etit.iotit -Unfacei 'Mea (.S is cox put'.ed as.
f 5 - pe r, nt ssiand, 20 perce nt ea f c./c. mpost, an d 300. perce'-nt top: soi I oit media sho�u[d be compos:&?d o 3
9.44.43VO cubic ft cif soil
Joretention Levrel 1' Design Surt�aac Area
ft de-p:
S 7fhhe vlouh iazl'e rpuntttz_�e?'d tan t� irl B'
�S'41
..........
..........
Geotextflle Fabric
unde.rdrn �
Pfa,� only a" -in
V
Un fdlfai Pip�e4
-dij orb;etterpol'ifOnyl pi�--rfic_'&matea-d pipp�,,3/.bl r_a.a-chrowof hengsto hul�2-s:.
6 I. n c. h, S c hee 1, e 4 0 c,
u, W z"i 9" u a CM, Am Ko dftw;�PE�'
rfurath-m •shall be 6-ind es anid th:e: miriimum s1ccipe c4l, the :3: ::SR.,. shc',utd b,-:-, 1%.
a 171
Max spadin bet rows of p a
J ;CY
. ...... ..
. .........
.........
Clear -�.o lit
_n
sol id p i pe that extends a bova- piand ing dep h
&A 0 .. ..... ... . ... .
Y
. .....
. .......... -
Underdmin Plae
3, ft long,
. .... . ....... . .......... ...........
.......... .
.......... ............ ...........
.......... ..... . . . ..... .........
g .... ..................
................ . . . ... ..... .
... . ..... . ........................ . . . ........ . .......... . ... . . . ...... . . ..... .
. . . ....................................
. . ...........................................
. .....
Total Storage
V o
Depth -id Ratio
... ... . .. . . ...........................
... . ...... ... .................
Sur"lace; sto S
U)
R V 0441 *Slte Rv On tab rVir
qu mary"f
CO.
rom VRRI.M ReOew Q. M.Phance. Spreadsheet
Biosoil
TV 1*0.357*18.731/12 - 6514.8:5 ft3.
Giravel
,SA 54632467
(7.5 ft2
-�
iot13;rCUp3
tffe_
is:[`. 5el,` f VRM ,-0)14
dP,veoj n mrar v Pp a/
:a v -o R
1_ft .9e nt tet y
8 cuft - : ta ib D, rn n560.: n r mlt Fi,Cpi .cSr dTJ
1
Calculation of Design Rainfall Intensity
and Peak Storm Water Runoff Rate - U.S. units
(for specified return period and storm duration)
Inputs
Drainage Area, A =
Design Return Period =
0.430 acres
100 years
Runoff Coefficient, C =
Tc, Time of Concentration
( Calculation below )
0.37
2 min
Time of Concentration (Kirpich Method: ADD. 6D-5 of VDOT Drainaae Manual
Tc = 0.00948*HA-0.38*LAI.13
H = 10.5 ft
L = 225 ft
Tc = 1.765 min
Calculation of Design Rainfall Intensity, i, using the equation: i = a/( d + b
(using the value for storm duratin, d, specified above)
'I' 'eaLRa.ngeftw
YPI
Type- of Z�rea p 1_1noff Coeily toicxtt
I Concrete Pavejuent 03 0-0.95
Park or Ce�xnetary/
Do,,Ynbalffn DuAn
Su'igle Fantily
Residential YU-ea
0. 10-0.25
Z I I �s 0.70-0.95
0.30-U0
Design Rainfall Intensity, i = 8.80 in/hr Rational, Nlethod Runoff Coefficients
Calculation of Design Peak Storm Water Runoff Rate, Q, using the equation: Q = CiA
Design Peak Storm Water Runoff Rate, Q = 1.4 cfs
����,TH OF
CHANCES FRANK VOTAVA
Lic. No. 034916
ZONAL
... .......
MR _1
Service.Authobrity
DESIGNED: zMC
DRAWN: JLB
CHECKED: CFV
VSMP APPLICATION
ACSA PROJECT No. 2013-04
CD PROJECT No. SDP 2014-54
MAJOR SITE PLAN AMEND. TO SDP 1992-4
Michael Baker Jr., Inc.
M*chai� :a A Unit of Michael Baker International
I I B, ker 272 Bendix Road, Suite 400
Virginia Beach, Virginia 23452
Phone: 757-463-8770
1 HTERNATIONAL Fax: 757-463-0503
GLENMORE GROUND STORAGE TANK, PUMP STATION, AND WATER MAIN PROJECT (PROJECT NO. 2013-04)
STORM WATER MANAGEMENT PLAN CALCULATIONS
NOVE 11 BER
2014
TAX MAP
093A1
079
SWM3
NO.
DATE
REVISION