HomeMy WebLinkAboutWPO201100071 Plan - E&S 2012-07-16ESC wy
APPROVED
by the Albernarle C01.11-lty
Corrlrnunity evelopment Departrrient
Date �7 l6�2d I- ` a
File
G 0
�UGUST
E3I, 20
N�TER PRCTEGTION ORD N�NGE
F��O`�ION GONT�OL PLAN
WATER PROTEGTION ORDINANGE SUBMITTAL
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GONER
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NOTES � EG NARRATIVE
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DRAINAGE MAPS
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EG PLAN - PHA5E
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EG PLAN - PHASE 2
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EG PLAN - PHASE 3
DEPARTMENT OF GOMMUN I T'r DEVELOPMENT
VICINITY MAP
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EXIT-107 SITE
4 WESTERN ALBEMARLE
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SITE DATA
ONNER/APPL I GANT:
SITE ADDRESS:
ENGINEER:
SOURGE OF SURVEY:
SOURGE OF TOPOGRAPHY:
DATUM OF SURVEY:
GOUNTY, STATE:
MA615TERIAL DISTRICT:
TAX MAP REFERENCE:
ZONING:
SETBAGK REQUIREMENTS:
EXISTING USES:
PROPOSED USES:
JEFFRIES II LLG
P.O. BOX cl 10
GROZET, VA 22.g32
RESTORE'N STATION
6115 ROGKFISH 6AP TUIRNPIKE
GROZET, VA 22g32
NP ENGINEERING
68O IVY FARM DRIVE
GHARLOTTESV!`,_LE, VA 22g01
TELEPHONE - (,r34) 531--138-7
ROGER N. RAY;l 4 ASSOGIATES, ING.
ROGER N. RAY 4 A550GIATE5, ING.
NAVD 88
ALBEMARLE COUNTY, VA
NHf TL HALL
55E3 - I
HG H16HNAY - GOMMERGIAL
FRONT -
BUILDING: 30'
PARK I N6: 10'
REAR -
BUILDING: 50'
PARKING: 20' (UNDISTURBED BUFFER)
NEST SIDE (ADJAGENT TO RA ZONING) -
BUILDIN6: 50'
PARKING: 20' (UNDISTURBED BUFFER)
EAST SIDE (ADJAGENT TO HG ZONING) -
BUILDING: 0'
PARK I NG : 10'
VACANT
GOMMERGIAL (GAS STATION � GONVENIENGE STORE)
"Proposed "byright" use for up to 1,624 gpci well water usage. Well water Is restricted to this limit.
Well wlll be metered to confilrm usage. (Water source for landscaping Is re -use of storm water.)
VDH Sewage Dispc.-sal 9ystern Gonstruction Permit 10# 101-09-0311 Issued Sept 16, 200a for 1600 gpd
PLANNER/ZONING
DATE LAND USE SGHEDULE: PROPOSED
BUILDING 5,000.00 50 FT.(I.6cf %)
ENGINEER PAVED (OR GRAVEL) 53,706.10 50 FT. (30.34 %)
OPEN SPAGE 120,2g0.461 SQ. FT. (b 1A6 %)
DATE TOTAL 176,gg6.5g 50. FT. (4.06 Ac-.)
BUILDING OFFIGIAL PARKING SGHEDULE:
REQUIRED PARKING
DATE RETAIL (Ist Floor)
ARGHITEGTURAL REVIEW BOARD 2,775 65F x 0.80 @ I 5PAGE/100 C75F = 23 SPAGES
DATE
OFFIGE (2nd FLOOR)
I,cl15 C75F x 0.80 (§ I 5PAGE/200 651' = 8 SPAGES
FIRE OFFIGIAL
DATE TOTAL PARKING REQUIRED FOR THIS SITE = 23 + 8 = 31 SPAGES
ALBEMARLE COUNTY SERVIGE AUTHORITY TOTAL PARKING SPAGES PROVIDED = 34 SPAGES + 5 HANDIGAP = 37 SPAGES
DATE WATER RESOURGE AREA: THE SITE LIES WITHIN A WATER SUPPLY PROTEGTION AREA
VIR61NIA DEPARTMENT OF TRANSPORTATION RESERVOIR NATERSHED: THE SITE LIES WITHIN THE BEAVER GREEK RESERVOIR NATERSHED
DATE FLOODPLAIN: THE SITE DOES NOT LIE WITHIN A FLOODPLAIN
MAXIMUM BUILDING HEIGHT: MAXIMUM BUILDING HEIGHT 15 55'
516NA6E: ALL SIGNS MUST BE APPROVED BY ARB
EMPLOYEES: MAXIMUM NUMBER OF EMPLOYEES = 10 TH
�y
P E� I G I� I E E R I N /7, W. Nathaniel D. Perkins
y. I �i. I � �j �, G)=RT. NO. 032304
680 Ivq Farm Drive%
Ghorlot e5ville, Virginia 22cf01
(434) 551-7158l
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DESIGNED BY
DATE
NP
6/21/II
DRAWN BY
DATE
NP
6/21/11
cHEGIGED BY
DATE
FILE
EDIT
RSEC
Sr -ALE 1 11=30'
DRAWINdw
EG-1
PLOT
SHEET I OF 6
EG-1
SOILS MAP
3703 - Hayesvlllle clay loam, 2 to 7 percent slopes, severely eroded
Properties and qualities
Slope, 2 to 7 percent
Depth to restrictive feature, More than 80 inches
Drainage class, Well drained
Capacity of the most limiting layer to transmit water (Ksat), Moderately high to high (0.57 to IA& In/Ir)
Depth to water table, More than 80 inches
Frequency of flooding. None
Frequency of ponding, None
Available water capacity. High (about lob inches)
Typical profile
O to 7 inches, Clay loam
7 to 58 Inches, Glay
58 to 67 Inches, Sandy clay loam
67 to 63 Inches, Fine sandy loam
This soll Is deep, sloping and well drained. Soil Is on narrow convex ridgetops. Slopes are smooth and about 200 to 400
feet long.
Permeability and ovallable water capacity of this soil is high. Depth to bedrock Is approximately 80 inches. Potential
frost action and shrink -swell potential is high, limiting the use of this soil as a building site or roadflll.
CRITICAL ER05ION AREAS,
There are no areas defined as critically erosive. However, care should be taken on a daily basis to maintain the erosion
t control structures to prevent silt from leaving the construction site. SpeclFlcally, silt Pence Is to be constructed
along the sides of the work zone to intercept and detain sediment. A construction entrance Is to be provided to prevent
tracking of mud into the public right-of-way by construction vehicles. Wash water is to be trucked in or obtained from a
metered well. Wash water is to be directed to slit fence. Inlet protection Is to be provided to prevent sediment from
entering the storm drain system upon construction of the on-slte storm drain Inlets.
CONSTRUCTION SEGUENGE/PHASING,
Construction shall follow the follow sequencing and phasing plan to minimize erosion. The erosion control measures shall
be in three phases,
Phase I
1) Install silt fence (5F) along the all property lines.
2) Install Construction Entrance (CE) as Indicated on the plans and any tree protection.
3) Install temporary diversion dikes, silt trap and sediment basin.
4) Demolish existing Improvements as necessary.
5) Clear and grub, strip top soil and stockpile for re -spread. Haul unsuitable material off -site to an approved
disposal location.
6) Rough grade site, install new utilities (storm draln, septic, haul excess material off -site as necessary to an
approved disposal location.
Phase 2
7) Install Inlet protection (IP) around the proposed drop inlets.
8) Proof roll subgrade In areas to receive asphalt pavement. Upon proof roll approval by geotechnlcal engineer,
install aggregate base, prime coat and asphalt paving per phasing sequence.
cl) Install building structures and stripe paving.
10) Provide temporary seeding and other erosion control devices to minimize transport of sediment.
II) Prepare landscaping areas.
12) Apply permanent seeding (109), landscaping and mulch (MU) to all denuded areas as indicated on the plans as
soon as possible.
Phase 3
13) Temporary sediment control structures are to remain in place and will be removed only when a satisfactory
stand of permanent grass Is present. Upon approval, remove temporary erosion control measures, remove unsuitable
material to on approved location, and stabilize affected areas.
14) Remove temporary Er, measures (silt traps, diversion dikes);
15) Install Rain Tank #1 4 #2 for the permanent storm water management facility;
16) Project closeout and bond release.
EROSION 4 SEDIMENT CONTROL LEGEND
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EG LE6END
EROSION AND SEDIMENT CONTROL MEASURESs
The measures noted below cnnd on the accompanying drawings are to be constructed and maintained by the contractor
in accordance with the latesst edition of the Albemarle County Code and the Virginia Erosion and Sedimentation Control
Handbook, Third Edition, Igg22. Symbols, details, and dimensions used are taken from the handbook, as well as the
Virginia Department of Transportation Road and Bridge Standards, Volume I, 2001.
A. STRUCTURAL PRAGTIGES,
I. Temporary construction entrance (CE), 5.02, Temporary construction entrance shall be provided and maintained
as shown on the plan sheet.
2. 5111; Fence (5F), 3.05, 5111; fence barriers shall be installed down slope of areas with minimal grades to
filter runoff from sheet flow as Indicated on the plan sheet.
3. Storm Drain Inlet Protectllon (IF), 3.07, Storm drain Inlet protection shall be provided for Inlets as shown
on the plans.
4. Temporary Diversion Dike (DD), 3.0ci, Temporary diversion dikes shall be provided as shown on the plans or as
needed to divert water Ito the silt traps.
5. Rock Check Dams (GD), 3}20. Rock check dams are to be Installed in the diversion ditches as needed to reduce
velocity of concentrated) flow and the potential of erosion.
6. Dust Control (DC), 3.3q, Provide dust control in areas subject to surface and air movement of duct where
on -site and off -site damage Is likely to occur if preventive measures are not taken.
7. Temporary 511t traps shalll be Installed and maintained per VE50 3.13.
8. Temporary sediment basim shall be Installed and maintained per VESG 3.14.
B. VEGETATIVE MEASURES.
I. Topsolling 4 stockpiling (T(0), 3.3o. Topsoil will be stripped from areas to be graded and stockpiled for
later use. Stockpiles are to be stabilized with temporary vegetation and have slit fence Installed along the
lower perimeter. Stockpllle locations to be approved by owner.
2. Temporary 5eedfng iTS), 331. All denuded areas which will be left dormant for extended periods of time shall
be seeded wlth fast gerlminating temporary vegetation Immediately following grading. Seed selection will be
dependent on the time olf year in accordance with the VESC.
3. Permanent Seeding (PS), 3.52. Permanent seeding shall be provided on site to provide stabilization for all
disturbed areas. Seeding rates are In pounds per acre. For high maintenance lawn areas apply 200-250 pounds
of Kentucky 31 fescue, 2 pounds of red top grass, and 20 pounds of seasonal nurse crop. The seasonal nurse
crop used is based on the following seeding dates,
a. From February 16 through April, use annual rye;
b. From May I through August 15, use foxtall millet;
a. From August 16 through October, use annual rye;
d. From November through February 15, use winter rye;
All permanent seeding shholl be fertilized, limed and mulched at the following rates. Fertilizer 10-20-10 at a rate
of 1000 pounds per acne, lime of agricultural grade limestone at a rate of 2 tons per acre, and straw mulch at a
rate of I . tons per acre. Before seeding, 4 inches of topsoil shall be spread in areas to be seeded. Apply
fertilizer and lime unlfornnly and mix well Into top 4 inches of seed bed. Prepare Boll for permanent seeding by
tillage of topsoil In place to loosen thoroughly and breakup all clods to a depth of 6 Inches. Remove all stumps
and roots, coarse vegetation, stones larger than I . inches and all construction debris. Sol[ shall be worked
by suitable agricultural equipment to a depth of not less than 4 Inches. Surface shall be uniform, smooth and
drainable. A firm and cormpact seed bed is required.
4. Mulching (MU), 535. All tem1porary and permanent seeding shall be straw mulched.
G. MINIMUM STANDARDS.
MS -I 5tabllllzation of denuded areas.
Permanent or temporary soul stabilization shall be applied to denuded areas with 7 days after final grade
is reached on any portion oif the site. Temporary soil stabilization shall be applied within 7 days to denuded
areas that may not be at final grade, but will remain dormant or undisturbed for longer than 30 days.
Permanent stabilization shall be applied to areas that are to be left dormant for more than one year.
MS-2 Stablllizatlon of solll stockpiles.
During construction of the project, soil stockpiles and borrow areas shall be stabilized or protected with
sediment trapping measures. The contractor to responsible for temporary protection, permanent stabilization
of all stockpiles on site, as well as borrow areas and soil Intentionally transported from the project site.
EROSION CONTROL NOTES
I. The plan approving authority must be notified one week prior to the pre -construction
conference, one week prior to the commencment 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 specllFicatlons of the Virglnla Erosion and Sediment Control
Handbook and Virg►nla Regulatl,ons VR625-02-00 Eroslon and Sediment Control Re ulatlons.
3. All erosion and sediment control measures are to be placed prior to or as the firs step
In clearing.
4. A copy of the approved erosion and sediment control plan shall be maintained at the site
at all times.
5. Prior to commencincci� 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 dralin to approved sediment control measures at all times
duringg land disturbing activities and during site development until final stabilization
Is achieved.
8. During dewateringg operations, Hater will be pumped Into an approved fliteringg device.
cl. The contractor shall Inspect all) erosion control measures periodically and afEer each
runoff -producing rainfall event. Any necessary repairs or cleanup to maintain the
effectiveness 6f 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 on 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 5.128.
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 q,00 pm.
15. Borrow, fill or waste activlty shall be conducted In a safe manner that maintains lateral support,
or order to minimize any hazardl to persons, physical damage to adjacent land and Improvements,
and damage to any{ pubTic street because of slides, sinking or collapse.
I6. The developer shall reserve thre right to install, maintain, remove or convert to permanent
stormHater management facilities where applicable all erosion control measures required by this plan
regardless of the sale of any llot, unit or building or other portion of the property.
17. Temporary stabilization shall be temporary seeding and mulching. Seeding Is to be at
75 ios/acre, and in the months of September to Februaryy to consist of a 50/50 mix of Annual
Ryegrass and Cereal Winter Ryie, or In March and April to consist of Annual Rye, or May
through August to consist of 6ewman Millet. Straw mulch Is to be applied at 80 Ib5/100 of.
18. Permanent stabilization shall be lime and fertilizer, permanent seeding, and mulch.
Agricultural cci�rade limestone shall be applied at c10 Ib5/1000 sf, incorporated Into the top
4-6 inches of soil. Fertilizer shall be applied at 1000 Ibs/acre and consist of a 10-20-16 nutrient
mix. Permanent seeding shall bes applied at 180 Ibs/acre and consist of c15% Kentucky 31 or
Tall Fescue and 0-5%Perrenlall Rye9rass or Kentucky Bluegrass. Straw mulch Is to be applied
at 80 Ibs/100 ef. Alternatives care subject to approval by the County erosion control Inspector.
Ici. Maintenance, All measures are Ito be Inspected weekly and after each rainfall. Any damage
or clog�Ing to structural measurres Is to be repaired fmmedlately. Silt traps are to be cleaned when
50% oPP he wet storage volumes Is filled with sediment. All seeded areas are to be reseeded when
necessary to achieve a clood Shand of grass. 511t fence and diversion dykes which are collecting
sediment -to half their height must be cleaned and repaired Immediately.
20.AI1 temporary erosion and sedirment control measures are to be removed with 30 days of final site
stabilization, when measures area no longer needed, subject to approval by the County erosion
control Inspector.
21. This plan shall be void IF the owuner does not obtain a permit within I year of the date of
approval (Water Protection Ordinance section 17-2046).
22. Permanent vegetation shall be Installed on all denuded areas within nine (ci) months after the
date the land disturbing activity commenced. (Water Protection Ordinance section 17-2076).
M5-3 Permanent Vegetative Cover.
A permanent vegetative cover shall bey established on denuded areas not otherwise permanently stabilized.
Permanent vegetation shall not be considered established until a ground cover is achieved that, In the opinion
of the E45 Inspector, Is uniform and mature enough to survive and inhibit erosion.
M9-4 Timing and stabilization of slit trapping measures.
Storm Inlet protection, silt fencing, and other measures intended to trap sediment shall be constructed as
a first step In aril land disturbing activities and shall be made functional before upslope land disturbance
takes place.
M5-5 Stabilization of earthen structures.
Stabilization measures shall be applied to earthen structures such as dikes and diversions Immediately after
Installation.
M5-6 Sediment basin and traps.
The sediment traps shall be installed as soon as the erosion control fencing Is installed. Excavation of the
slit trap under, and In the embarkment shall be free of organics (roots and vegetation). Sediment shall be
removed and the trap restored to Its original dimensions when the sediment has accumulated to one half the
wet storage volume for the slit trap, and once the sediment reaches the sediment cleanout elevation for the sediment basin.
M9-7 Gut to Fill slopes,
Gut to fill slopes shall be constructed 1rn 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.
M5-8 Concentrated runoff down cut or fill slopes,
Concentrated runoff shall not flow down cut or fill slopes unless contained within an adequate temporary
or permanent channel, flume or slope drraln structure.
MS-q Water seepage from a slope faace,
Whenever water seeps from a slope farce, adequate drainage or other protection shall be provided.
MS-10 Storm Inlet Protection.
All storm Inlets that are operable durinng construction shall be protected so that sediment laden water
cannot enter the conveyance system without first being filtered or otherwise treated to remove sediment.
M9-11 Stabilization of outlets. Not used.
MS-12 Work In live watercourses, Nott used.
MS-13 Grossing a live watercourse, Not used.
M5-14 Applicable Regulation,
All applicable federal, state and local regulations pertaining to working In or crossing live watercourses
shall be met.
M5-15 Stabilization of bed and banks„ Not used.
M5-16 Underground utilities,
Underground utility lines shall be Installed In accordance with the following standards, in addition
to other applicable criteria,
a. No more than 500 lineal feet of trench may be opened at one time;
b. More consistent with safety and space considerations, excavated material Is to be placed on the
uphill side of trenches, except for any diversion ditches;
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 offslte property;
d. Trench backflll material shall be properly compacted in order to minimize erosion and promote
stabilization;
e. RestcbIllzatlon shall be accomplished in accordance with these regulations;
f. All applicable safety regulations shall be compiled with at all times.
EROSION CONTROL NARRATIVE
PROJECT DE5CRIPTION,
This project consists of the construction of a two story convenience store building (2,775 sf footprint) and associated
site amenities and parking areas. The project scope includes grading and Installation of asphalt travel ways and parking
5paces, and utilities (well and septic). The project site is 4.06 acres and lies within the Stockton Greek water supply
watershed. The disturbed area for the project Is approximately 2.45 acres. Erosion control for the site will be managed
using perimeter controls and the Installation of a temporary sediment basin and sllt trap.
EXISTING SITE CONDITIONS.
The site is located on Rockfish Gap Turnpike (SR 250) approximately 0.78 miles west of the intersection with Miller
School Road (5R 240). The site is currently vacant and grass fields. The site slopes in general from north to south at
approximately 5%.
ADJACENT AREAS,
The site Is bounded on the north by 5R 250, to the east by Freetown Lane and Highway Commercial zoning (automotive
repair shop), to the west by rural area (Crozet Moose Lodge) and to the south by rural area, residential use. Existing
surface drainage Is directed south to an exl5ting stream.
OFF -SITE AREAS,
Off -site areas to be disturbed are limited to the southern property line where the storm drainage outfall outlets In
the existing stream. This area Is delineated with a drainage easement.
501L5,
According to the USDA SG5 solls mapping, the project site lies in soils,
70 Braddock loam
56B Hayesvllle loam
3703 Hayesvllle clay loam
The soils are described as.
70 - Braddock loam, 2 to 7 percent slopes
Properties and qualities
Slope, 2 to 7 percent
Depth to restrictive feature, More than 80 inches
Drainage class, Wall drained
Capacity of the most limiting layer to transmit water (Ksat), Moderately high to high (0.57 to I.qB inter)
Depth to water table, More than 80 Inches
Frequency of flooding, None
Frequency of ponding, None
Available water capacity, High (about q.l Inches)
Typical profile
O to 8 Inches, Loam
8 to 141 inches, Clay
565 - Hoyesvllle loam, 2 to 7 percent slopes
Properties and qualities
Slope, 2 to 7 percent
Depth to restrictive feature, More than 80 inches
Drainage class, Wall drained
Capacity of the most limiting layer to transmit water (Ksat), Moderately high to high (0.57 to 1.98 in/hr)
Depth to water table. More than 80 inches
Frequency of flooding, None
Frequency of pondfng, None
Available water capacity, High (about 10.6 Inches)
Typical profile
0 to 7 inches, Loam
7 to 58 Inches, Clay
58 to 67 inches, Sandy clay loam
67 to 83 Inches. Fine sandy loam
MS-17 Construction access routes,
More 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. More sediment Is
transported onto a paved or public roaad, the road surface shall be cleaned thoroughly at the end of each day.
Sediment shall be removed by shoveling or sweepling and transported to a sediment disposal area. Street
washing shall be allowed only after sediment Is rermoved in this manner. This provision shall apply to
Individual development lots as well as larger land -disturbing activities.
MS-15 Temporary E45 Control measure removall.
All temporary erosion and sediment control measures shall be removed within 30 days after final site
stabilization or after temporary measures are no longer needed, unless otherwise authorized by the local
E45 authority. Trapped sediment and tho disturbed soli areas resulting from the disposition of temporary
measures shall be permanently stabilized to prevent further erosion and sedimentation.
MS-Iq Adequacy of receiving channels,
Properties and waterways downstream from the development site shall be protected from sediment deposition,
erosion and damage due to increases In volume, velocity and peak flow rates of storm water runoff for the
stated frequency storm of 24-hour durotlon. This will be accomplished by limiting the post development volume
and velocity to pre -development levels.
D. MAINTENANCE,
All erosion and sediment control structures and systems shall be maintained, Inspected, and repaired as needed to
Insure continued performance of their intended function. All erosion and sediment control measures shall be checked
at the and of each day and after every rainfall event.
I. Damage to erosion control measures caused by construction traffic or other activity shall be repaired
before the end of each working day.
2. Maintain all seeded areas until a uniform stan
d is accepted.
3. Provide for equipment washing as needed to prevent the transport of soil onto existing asphalt roadways.
4. Both temporary and permanent roads and parking areas may require periodic top dressing with new gravel.
5. Slit fence barriers will be checked daily for undermining or deterioration of the fabric. Sediment shall
be removed when the level reaches half way to the top of the barrier.
6. Sediment shall be removed from around the Inlet protection trap structure and restored to Its original
dimensions when the sediment has accumulated to one-half the design depth of the trap. The trap
structures shall be removed and the area stabilized when the remaining drainage area has been properly
stabilized.
7. Temporary diversion dikes shall be Inspected regularly and repairs made If needed.
8. Sediment accumulated wlthln diversions shol'T be removed from the channel and repairs made as necessary.
q. Sediment should be removed from rock check dams when It reaches one-half of the original height of the
measure. Regular inspections should be made to insure that the center of the dam Is lower than the edges.
Erosion caused by high flows around the edgges of the dam should be corrected Immediately.
10. All soil stabilization blankets and matting shall be inspected after rainstorms to check for erosion and
undermining. if washout or breakage occurs reinstall the material after repairing damage to the slope
or ditch.
11. Sediment shall be removed from the sedlment trap and restored to Its original dimensions when the sediment
has accumulated to one half the wet storage volume.
W. Nc*anlel 0. Perkins
GERT. NO.032304
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6/21/11
DRAM BY
DATE
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6/21/II
CHECKED BY
DATE
FILE
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SCALE 1 "=30,
DRAWING
EG-2
PLOT
SHEET 2 OF 6
EG-2
DRAINR6E MAP
(�roo to sediment basin)
(lire-Development conditions)
RESTORE'N STATION
DRAINAGE AREA SUMMARY
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6 `: i ,1,
0.0 ., o.9Q . 5
0.07 0.90 5
7 a e n c
r efled urb
Y
. ,
7 area defined by curb
'7 r..
.A
,
I
1 484 5 . , _ �
1 Q. �
h,a.
, , 9 Q
', , , � {
7
; •:,are efri' d' urb
I Y
7B
18 902.46
0 43
0 90
5
7
area defined b curb
Y urb
099.3.1 ,.
, . o. 9
I:
, , Q .
, , � � . I , ,
„ read fln , L.
DA9
4,517.521
0 0
0 90
5
9
of Route 50
f R t 2 ,area defined by curb
Total � 8�r73
r ,
3 i
1
„
, l i
, 1
,
Offsite Area
37,461.60
0.86
0.30
DA 10
77, 857.25
1.79
0.30
DRAINAGE AREA SUMMARY
Paved construction entrance for erosion o)ntrol plans
M QR' Ar G
IN
Paved Nash Rod< Detoi
DRAINA6E MAP
(Post -Development conditions)
(Phase I I � III)
COUC~ITY: Albemarle
SEC�TIOC~I
Area
c
Tc
Q (2yr)
Q
acres
value
min.
of;
(l0yr)
ofs
LINING
n
Value
Rip -rap
Glass (VDOTi
H
ft
BUV
ft
RS
x:l
LS
x:l
SLOPE
ftJft
Depth of
Flow, ft (l0yr)
VELOCITY
fps (2yr)
Remarks
Ditch 1 - Rte 250, Cross Section 6
0.43
0.48
5
1.07
1.94
Grass
0.050
NJA
2
4
6.4
5.6
4.41
0.53
1.04
Vee ditch
Ditch 2 -Silt Trap bypass
0.50
0.30
5
0.78
1.41
Rip -rap
0.030
CLASS I
1.5
0
2.0
2.0
0.04587
0.44
3.11
Vee ditch -Rip Rap
Ditch 3 - SUUNS bypass (.start head of ditch, STA O+OO)
2.00
0.30
5
3.12
5.64
Grass
0.050
N/A
2
0
2.0
2.0
0.07140
0.83
3.54
Vee ditch- EC2
Ditch 3-SWNI bypass (.STA 1+00)
2.48
0.30
5
3.87
6.99
Grass
0.050
N/A
2
0
2.0
2.0
4.04910
0.96
3.25
Vee ditch- EC2
Ditch 3 - SV'UNl bypass (@ D17, STA 1 +60)
2.80
0.30
5
4.37
7.94
Grass
0.050
NJA
2
0
2.4
2.0
0.04914
1.01
3.35
Vee ditch - EC2
DITCH GALGULATIONS
TOTAL
DRAINAGE
AREA
TO
SEDIMENT
BASIN =
4.6g AGRES
TOTAL
DRAINAGE
AREA
TO
SILT
TRAP
= DA#11
= 16/515.68 5f = 0.5-7 AGRES
f
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DE516NED BY
DATE
NP
6/21/II
DRAWN BY
DATE
NP
6/21/II
GiIEGKEU BY
DATE
PILE
EDIT
RSEG
-
SGALE I11_30'
DRANUN6
EG-3
:•
SOIL EROSION AND SEDIMENTATION CONTROL SYBMOLS
GE = GONSTRUGTION ENTRANGE
TS = TEMPORARY SEED I NCB
MU = MULGH
PS = PERMANENT SEED I NCB
DG = DUST CONTROL
P = INLET PROTEGTI ON
OF = OUTLET PROTEGTION
SE = SILT EENGE
SB = TEMP. SEDIMENT BASIN
\
/ Mel/ \
/Bdtoiin • 6 IA
/�Ph■ \ \
4 I \ \
y 1
/ L .L \
67 1
i ' TREE _ �•
48125� 114.a2ft - IRori' \- -
-6-to- -
/
OP
/ _ t
/
1 Is
/
/ I
IRON -
/ FOCJND
,
NET
AREA
/
,
,
/
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(a' AREA \\
NET
NET
i AREA
/
/
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NSET
GONSTRUGTION SEGUENGE
Sediment Trap Design (ST #1 - A)
drairnge area (acres) (c3)
o.85l-�N-^^�
trap volumes:
utESE bE:S farvE wEr2
vn,wurt
elevarlen Ifr) area (sf) volume(cy)
cum. vol.(cy)
678 310.48 0
0.0
0R'f yroRnG[ .,-y
680 546.01 31.7
31.7
682 1216.86 65.3
97.0
684 2124.22 123.7
2xJ.8
T_ � T
fLre.N SYatrA
wet storage:
wet storage required (cy) (67•DA)
57.0
botrom of stone weir (n)
680.6
wet storage provided at trds elevation (cy)
57.0
slope of wet storage sides
1:1
welr lengtn (ft) (6xDA)
5.1
dry storage:
oonom oP trap sieve flan (ft)
678
dry storege req Lired (cy) (67•DA)
57.0
ooitam trap dimensions:
13.5x375
crest of stone weir
682.3
top cf dam elevation (n)
684
dry storage provided at this elevatlon (cy)
57.0
top width of dam (ft)
5
slope of dry storage sides
2:1
top trap dimensions
30'Al 15..
sedim•ntsasin Design
drainage area (acres)
4na
aW' HSaN 1
basin VOlVa'iaa: (V9Y1g2•COnIWrY�IeNolS)
IT_L
I:3-ra.. S:pW [i YJ '
Elav(ft) Contour orea(sf) Volume(cy)
Cumvol(ry)
dx 4He
T
672 1302.35 24,12
24,12
' un • SrOn Ge WW",
"`-''
674 21 la.72 126.71
16042
✓.
676 3132.08 194.47
345.30
676 4301.67 276.32
620.62
660 5776.91 373.2a
993.90
f'ro c•�'+�
wet storage:
wet storage legvired(cy)(61'DA)
3136
davgn high water
680.0
dewatering orrice elevaticn(f')
675.7
top ofdam [ft)
6al.0
wet storage provided at Ihs elevation (cy)
3274
top width of dam (ft)
6.0
available volume before cleanovl (co f33'DA)
164.4
bottom of basin Ill
67I.0
deancuf elevation Ill)
674.1 -
app- boilomdimersi-
47'x5V
dstanca from claanovt to onfica(ft)(>11
116
upstream face slope:
2:1
downstream face elope:
3:1
dry storage:
City storage raqurad (cy) (67•DA)
3136
barfl-
yes
l'1hcip:e spr1may crest lfj
67a.03
length of flow, L (ff,
697i
dry a'orage provided at this elevalionIcy)
313,6
effaciue width, We (ft)
2.1
diameterofdewatering orrice(n)
2A
LIM (boftle3regviedf>2)
2a2
diarnelarof flaribla luting (n)(ai(re a+2")
EA
cdJars:
yes
rvnoff:
depth of w ter at spillway crest ;f1)
7.0
C (use 0.45 forbore earth)
0.46
slope of ulpsireomf«a Q:I)
2
tc V11ri
14
slope of barrel (Sb)
0.016
i2yr 3.6 Q2yr
75
length of barrel h saturoled zone (D)
50
126yr 5.7 Q25yr
12.0
number c oYanrequted
2
dim-i.n of Ccll(n
Erb
prindp;e spilw.y:
available head (0)
1A
-erg-ay sp'llwuy:
yes
dum.l-iser (10
33
iaquiredcap-ty (Q26.Qp) (cfs)
4.6
spilway ccpac:hy Qp(ch)
75
bottomwidt, 1n)
a
diameter truth rack (irl
54
slope of exist channel (fl(fq
0.039
barrellength(ft)
62.11
Wink -length of exit chcnnel(ft)
32
head on barrel t'rsoug'r mbanirnent (ft)
eA
cress ofsp,ll-y (ft)
679.4
diameterof barrel (in)
15
TEMPORARY SEDIMENT BASIN
SGHEMATIG LAYOUT
H qh water elevation - 680'
Dry storage elevation - 618.03'
Wet storage elevation = 6- 5. 71
61e4z1out Zvoa'to n ■ 6'i4.1'
Top of Riser - 6"16A3
3' orl w/ 6" tubing
Dewaterh�g Device ■ 615.1' �'
Bottom Dtnernbns = 41' x 51'
Bottom Elev = 611
OtrtFlow Invert - 6lIV
351 Vl Riser W/ steel base
Trash rack olnd anti vortex devl
(2) iMI-Seep collars - 5' x 5'
Top of Berm - 681.0
Top width - 6'
IB°
C4-P o ISM
Phase
1) Install silt fence (5E)e
2) Install Gonstruction Entrance (GE) as indicated on the plans and any tree protection.
5) Install temporary diversion dikes and silt traps.
4) Demolish existing improvements as necessary.
5) Glear and grub, strip top soil and stockpile for re -spread. Haul unsuitable material off -site to an approved
disposal location.
6) Rough grade site, install new utilities (storm drain, septic, haul excess material off -site as necessary to an
approved disposal location.
GRAPHIC SCALE I"=30'
0 30 60 90
A
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DE516NED 5Y
DATE
HP
6/21111
DRAWN BY
DATE
NP
6/21/II
C4ECKED BY
DATE
i=1LE
EDIT
R5EG
I -
S6ALE I II = 30,
DRAWIN6
Ec-4
PLOT
SHEET 4OF6
E G 4
.W
'-
------- - - - - --
INY _ -- �� _ ,'W TER
M TER
- --------------------------i8.lo _ -- i--------------
OUT= _ _ _ _ - - - - _ - ,' BLUE
-------------------------b�i�TO _ - - - - - - - _ _ _ _ - � PAINT ''
------------------ __ _--------- S PROVIDED BY \(.D.O.T.)
------------------------------ _ _----------------- --- PROJEGT -123-6 (PLAN
-----------------------------U _
S . ROUTE 20 (I I Of R/l�� w _w w -w---------w w -
w
SIGN
p NO GRAVEL �' •' NO
Nu PARKING PARKING
PARKIN G ,
--- - - \ l --- N---------------!---------
----------------- I \ , o - - - // ,�-
r- LE _ --
�=----'
F' t J 8 3 3q .23f t T I IReN
15" GMP I IQ.78' ®6. �,' t N86
Entrance � 1 I •� _ 1=bUND
In /
/ I 10 arP king 5at6d�ck / / � I I / I I
r=rhU D I II I GRAVEL
�
I II Ii - - - - - - -- 1 I l . . . . . . . . . . . . . . IP
P5 Drainfield
50%' Reserve
.
I
I II I 1
,' I _ `.�.
m I II
I II I/ �`� \\ \ I QI y
\ 1 ill
I I 1 / I I `\ � \ •I 1 1 I II
\ \
I I i Fence \ \ \ \ \ \ \ I uI Y Ni \l I II
1 l I I \
0 Tarlke '
po' x 34-1 J P I ► i t I /' \
Lanc�e Canopy I D a ll II
I iN ► I I I l ` \ , 70 �. ` ` 38' x CIO' _
I III 11 6� ~ \\ l �1 It
rill /
ly/
611PVGOIbI%
I I •�- I I i I l � ' � \ _ _ _ _ •- �. - - - � --f�000� (-icier \ \ ' i ^ 1 � - �
I o I I r l l / - ��. o- "�} \ 1• \ _c I l -/ I II 1 /
Bollards
(hp. • bldgJ
ZI ,-
'
\' \
\Propposed Two \\ `t I \ � \ ,I' N \ I IV
story 61dCj \ oiC.
I O/AT)
/ I 1 I I I / \ \ \ Q v I . \ E _ "705.'j10 \ v I • - - _ \ I // �/ / j 1 1
/' I ► I I I / \ \ \: ;�, (15t I.=2,-7-15 sf)
•�11. , (2nd�1.=1,915 sf)
►' ' 11 I I; I�- LIMI JOF D15TURB E
/ -•'/ I Q I'll III
LIMITS OF D RI3 /I11 1
' i ll 1 \j
. 1
I
"Val Stop (tw) r1 'I Il I
S ' // fl') ••• .'. ' , \\ \ ` VG ,'/j
'C�;.
/IRON
� FPUNQ/ i I I / / /l / \ \ x ::.. t,... �. 1 . . , / , / ' I / I 14-
N �,' � I I I I
,l / / / \ \ Drai// III 1\
x // /�/ /� \\ \\ ... \\ `\ \\ nl'leld
/
1 DrIeInfie1\0 B
1 AdditioncSil ,----- ► 1 I 11
R6cq,erv� ' N I ► I I 11 1
i
sm
�'.-�-1. 1. \. Roof line / I V ► II \ \
1/ I x /3
/ / / / r \ fx\i .l . _- - - - - -- Y20' X 24') / , ,' ►► I ' ` \ \ \
I DIE5
Ic \ \ f3-
/BolE�onl9r� \ ` x y Q@. I \ l�Tus ; - _ - _ - _ - - I _ _
r \ \ \ po' x 7 I _ nv
d
\ � ^ _ -ivdc=LCVy , I 1 I I I \
If I
1 f I (i y / , // 1 \ \ ` \ T 8ry x 604.0' '
° I cl' X. / . 1 - - - - \ ` \ ►J•h , all
50' Buildln \ Selba� k STV
X / /
(20' off PQ
End of Fe
T I
X x x CJ" 1�5„ m
20'Undist d �I
I i:�ON I I / / / / / ' _ Buf r \ \ 1 I
A ,81146.g-iO2-f-t IRON _1, °,48_ � 25-_nN _ 3_-3_0.1 O- f- tSET'
/ O`
'► I/ _ I
/ I
SOIL EROSION AND SEDIMENTATION CONTROL SYBMOLS
GE = GONSTRUGTION ENTRANGE
TS = TEMPORARY SEED I NCB
MU = MULGM
PS = PERMANENT SEED I NCB
DG = DUST CONTROL
IF = INLET PROTECTION
OF = OUTLET PROTECTION
SF = SILT 1=ENGE
SB = TEMP. SEDIMENT BASIN
/ 1
611D'
SW
Wa I I \
r I 1
'�
611
aiv
/
i
\
/ .��. •6--Racy
b'i (20' off PQ
., / End of Fen
- _ - - - 20' Undlst
rbed
- But
S°48'25'E114.a2ft
--_ -�
.
IRONop
»
/ I
/
IRON
/ FOUND
/
OWER LIN
NET
. ' NET AREA
AREA
\
/
' NET
' NET ' i AREA
' p AREA /
'
bb
INSET
GONSTRUGTION SEGUENGE
Sediment Trap Design (ST #1 - 8)
draincge oreo (acres) (,0)
0.35
trap voll es:
one.x rr*rbinr Trkrwfki
elewilon (B) area (sf) wlvne(cy)
c1.m. VOL(cy)
,c C WHIP-
676 0 0
0.0
-
678 99.13 0.0
0.0
UkY:fbkbc£ .y
680 232.92 12.3
12.3
682 672.03 33.5
45.8
1vcT sratfpMe
684 232.92 33.5
79.3
'i •
xSEL +iMiE:J.71-x LU.kEE.,u^".aw'.+JE '. M'
storage:
storage recUred (c7) (67'DA)
23.5
om of stone weir (fl)
661.2
storage provided ar it -is elewilon (ay)
23.5
e of wet storage sides
I:1
weir length (ft) (6xDA) (to be 5.1' as per Ph 1)
2.1
storage:
bottom of trap elevation (rt)
678
�toroge reqjired (cy) (67`DA)
23.5
botfam trcp dimensions:
85X21D
t of stone weir
683.2
top of dam elevation (ft)
634
;taroge provided at ih's elevation (cy)
23.5
top wldth of darn (ft)
5
e of dry starage sides
2:1
top trap dlrnensi-s
32.5.76.5
Silt Trap I will need to be modified to the new drainage
area once the curbing and curb inlets are established.
Phase 2
70
Install
inlet protection (IF) around the proposed
drop inlets. Regrade/resize. Silt Trap I to new drainage area.
8)
Proof
roll 5ubgrade in areas to receive asphalt
pavement. Upon proof roll approval by geotechnical engineer,
install
aggregate base, prime coat and asphalt
paving per phasing 5ecuence.
cl)
Install
building structures and stripe paving.
10)
Provide temporary seeding and other erosion control devices to minimize transport of sediment.
II)
Prepare landscaping areas.
12)
Apply
permanent seeding (PS), landscaping and
mulch (MU) to all denuded areas as indicated on the plans as
soon as possible.
GRAPHIC SCALE 1"=30'
0 30 60 90
W. Nathaniel 0. Perkins
CERT. NO. 032304
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DATE
NP
6/21/11
DRAHN 13Y
DATE
NP
6/21/11
CHECKED BY
DATE
FILE
EDIT
R9EG
I -
SCALE 111=30'
DRANN6
EG-5
PLOT
SHEET 5 OF b
EG-5
_ .' ' I W TER
- ------_- ---- --'�'' M TER -------------
- - - - - OUT= _ _ _-- _ _ - - _ _ - ' ,''BLUE
-------------------------i5TO - - - - - - - _ _ - - _ _ - - - PAINT
-------------------------- _-_ _----- - - P\N5 pROVIDED BY �I.D.O.T.)
-------------- _------------------ PRO,�EGT -123 6 (PLANS
�LJ) ROUT w —_---w-------w ----w --
z 1Q05 ' w w w
51GN
NO GRAVEL �' ' ' NO
,' PARKING
PARKING PARKING
i
1 _ I - - ---- p-- --T- _----� P°'s POL �.` LE - T IPON
15�� MP ` ' ' ' • la.-r�6.1\ N�68'34"� 323f t - ;� I' , /' EbUND
Entrance
p
1 I Inv �
I 1Tparking�et dick
11
IRON I 11 1 GRAVEL
I,bUND 1 30' 8ullaing Setback i ---'� / r I 1 ri /
. . . . . . . . .
Drainfield �. �\ . `, �' ►i 1' /
50%' Reserve \
_ . . . . . . . . . . . . . .
- `.. . . . . . . . . . . .
SYSTEM I.\
I 1 I y (G STERN) \ . . . . . . . .
(D To = 10rs) \ . ... .
MH FOR
WATER REUSE . \ • I I ► II,
< 4 I II
X ` \ (5) 116 Fuel $ I I 111
Tanke
•LI ITS O�STU . F
I •(� V I I G
1 -� \ '� I v �7 .l• �-- I 11 � �
XI \� ` I
X `_ \ \. \�\ L 3�exg0'py
I I � III I I I ��� . � � - - I , F•-t" 1 II
ILU
'I- _ II 1/
Q, 1 III --
X X \ ' \ - - - ¢10(.a�e
13
I I 1 Bollards (6")
I pl I ► I , ,' F"' - �` MU i' I �n Ho , (hp. 0 bldgj
I I ZI I ! I I , �\ , .• \ 1 IIII � -- i ,--.
blWI
/ ► I I I I I / ` \ u�, . `\Proposed Two
/ I 1 I I X I ► / m, 01 i Story Bid
/' 11 j I I I I I I ! ` . \ `\ ' `\ • , • IL I (Ist\ 1.=2 -175 sf)
(2n fl.=V115 sf)
\1!'
b-
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rl
< 'III 1
-41
FPUND, x . . . t„• , \` ,
,/ i
x,! ' .� // �\ \\\\ D infield' - �0' 1 ►' i I ��
/ / OMIT 'OE < 1 I
/ I � I \ \ : /
' DISTU �NGE \ . . �,. I , ► I I
\. . . . _ _ _ . .
Dr!einf le I\0 B ' / I ► ►III 1 \ \
`\ \IdditiOndtl I - - - - -
Itol�stablw>I" , - \ x` \` \. , 1 / '' �/ / 10SIM
�i.. \ ► . \ R��Serve . \ / ,' ,'
SY! TEM 2 / \ f line
\ \ 5(T1
--' Roo
- U _ I
T�i 67 .6 \ \ . \ . I(20 x 24) , / k q ► \
bottom
xq I \ \ I Olga
yaPl \ (2)U& II- - - - - - - -
I . / / , I ► ` 1
00' x ) 1, _
, / ,' r•/� I I / ,' / \ \ \I \\ , 'Hies¢' _ - � ' / / ► ' I\ i / 11
LW 642-7
I I I
Building Setback ' �' qv ' 1
6' Privacy
(20' off PU
- - _ End. gf, �1 Sept
,••a'' I I I / / ,' I , / x/ , / \ �'5ys'tem
/ / / I ► r i ` �` J 1 I I I ! \ 1
201Undist d � IkON I \ Buf r �`
�kUNYI - r ' - - ��— — — \ 1 OUND I II /
- �' �8,'f °48;2�' 114.g2f t
/BIRO , , -670- - _ IRON
No
�I
I \ ,
� �5�'1N j'}I STURB>4NGE
SOIL EROSION AND SEDIMENTATION CONTROL SYBMOLS
GE = GONSTRUGTION ENTR4NGE
TS - TEMPORARY SEED I NCB
MU = MULGH
PS = PERMANENT SEED I NCB
DG = DUST GONTROL
P = INLET PROTEGTI ON
OP = OUTLET PROTEGTION
SE = SILT EENGE
SB = TEMP. SEDIMENT BASIN
Trp
16
/
,
/ 01 \
/
6' Privacy
67 (20' off PL)
20' UndIrt
Buf
'E 114.g2f t
IRON `
,
L IM I T5 OF �� \
I?15TURBANGE
Z
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qET AREA
A
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AAREA
REA
(do
, \ /
INSET
GONSTRUGT I ON SEGUENGE
Phase 3
13) Temporary sediment control structures are to remain in place and will be removed only when a satisfactory
stand of permanent grass is present. Upon approval, remove temporary erosion control measures, remove unsultable
material to an approved location, and stabilize affected areas.
14) Remove temporary EG measures (slit traps, diverslon dikes);
15) Install 5WM System #1 � #2 for the permanent storm water management facility;
16) Project closeout and bond release.
GRAPHIC SCALE 1"=30'
0 30 60 90
H. Nathaniel 0. Perking
CERT. NO.032304
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DESIGNED BY
DATE
NP
6/21/II
DRAWN BY
DATE
NP
6/21/II
cHEGKED BY
DATE
FILE
EDIT
RSEG
I -
SGALE 1u=30'
AEG-6
PLOT
SHEET 6 OF 6
EG-6