HomeMy WebLinkAboutWPO201800027 Plan - VSMP WPO VSMP 2020-02-12'_cl� 1 4 L
0144AER:
PRESIDIO PANTOPS, LLC
455 SECOND ST SE, STH FLOOR
CHARLOTTESVILLE, VA 22902
DEVELOPER".
RIVERBEND DEVELOPMENT
455 SECOND STREET SE, SUITE 400
CHARLOTFESVILLE, VA 22902
(434) 245-4970
ENGINEER:
COLLINS ENGINEERING
200 GARRETT ST, SUITE K
CHARLOTTESVILLE, VA 22902
(434) 293-3719
TAX MAP NO.:
07800-00-00-02OM3 DB 4935 PG 500
TOTAL PROJECT AREA:
26.98 ACRES TOTAL
ZONING:
PLANNED DEVELOPMENT MXED COMMERCIAL WITH PROFFER-S (ZMA 01-01-5),v
PRESERVED AND MANAGED STEEP SLOPES OVERLAY AREA. 100 YR FLOODPLAIN
OVERLAY DISTRICT
TOPO & SURVEY:
SURVEY PROVIDED BY ROUDABUSH & GALE DATED JUNE, 2017. TOPOGRAPHY
IS AERIAL SURVEY PERFORMED BY VIRGINIA RESOURCE MAPPING DATED
JANUARY, 2006. TOPO FIELD VERIFIED BY COLLINS ENGINEERING IN JANUARY
2018.
WATERSHED / WATER RESOURCE AREA., RIVANNA RIVER DRAINAGE BASIN
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STOCKPILE AREA VSMP PLAN� I
RIVANN'A mm'mAGISTERIAL DISTRICT
ALBEMARLE COUNTY, VIRG00"INIA
TMP- 07800-00-00-o2oFo OWNER: JDM 11 SF NATIONAL LLC IC/O STATE FARM MUTUA AUTOMOBILE IZONING: COMMERCIAL. OFFICE ACREAGE: 35.00 AC t11fIl I'
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FIG: 4475/728 I11 tit; jjj!1�111 I IIIt I Jet:, IIt1�, 1 f f IIIIItIIIIIIIIIIIIIII
07800-00-00-02OM4
=ER. MARTHA JEFFERSON HOSI
ZONING; PLANNED DEVELOPMENT
COMMERCIAL
�CREAGE: 38.49 AC
DBjPG. 49351500
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APPROVED
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CorntruNty Depat-trnent
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SCOTT � R. COLIJNS;?,
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No. 35791 11:-
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TITLE
SHEET
COVER
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EKISTING CONDITIONS
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EROSION & SEDIMENT CONTROL PLAN NARRATIVE
E
EROSION & SEDIMENT CONTROL PLAN
4
EROSION & SEDIMENT CONTROL DETAILS & CALCULATIONS
5
STORMWATER MANAGEMENT PLAN
6
LEVEL II WET POND DETAILS
7
8
UNDERGROUND DETENTION SYSTEM
& DRY DETENTION CELL DETAILS
GENERAL STORMWATER MANAGEMENT NOTES DETAILS
9
L9
TOTAL SHEETS
9
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LECEND
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ORGINIA ER057ON & SEDIMENT C0N7R0L
EROSION-C-ONMOL 14ANDBOOK SPECIFICARON NUMBER
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EXIS77NG CONTOUR
SCAI E
PRESERVED S7EEP SLOPES
AS SHOWN
MANAGED STEEP SLOPES
SHEET NO.
cc TH
A NOTES:
1. THIS PROJECr IS LOCATED WITHIN ZONE X "AREA OF MINIMAL FLOOD HAZARD
BENCHMARK EXISTING
PRESERVED S7EFP SLOPES BASED ON FEMA MAP NUMBER 51003CO289D ADOPTED FEBRUARY 4, 2005.
SANITARY SEWER MANHOLE
2. SURVEY PROVIDED BY ROUDABUSH & GALE DATED JUNE, 2017. TOPOGRAP
SCOTT INStZ
TOP ELEV 446.92 HY IS COTIL
> A. AERIAL SURVEY PERFORMED BY VIRGINIA RESOURCE MAPPING DATED JANUARY,
A
EP SLOPES
2006. TOPO FIELD VERIFIED BY COLLINS ENGINEERING IN JANUARY 2018.
MANAGED S7E No. 35791
V, 3. MANAGED AND PRESERVED STEEP SLOPES ARE LOCATED ON THE PROPERTY.
4. 100'WPO STREAM BUFFER IS SHOWN. THE STREAM BUFFER SHOWN HEREON
7,
SHALL BE MANAGED IN ACCORDANCE WITH THE ALBEMARLE COUNTY WATER
'ORAL
PROTECTION ORDINANCE. LLJ
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FARM MUTUAL AUTOMOBILE 'Wit TMP: 07800-00-00-02OM4
ZONING: COMMERCIAL OFFICE i i OWNER: MARTHA JEFFERSON HOSPITAL
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ACREAGE: 35.00AC ZONING: PLANNED DEVELOPMENT
DB/PG: MIXED COMMERCIAL
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ACREAGE: 38.49 AC
DB/PG: 4935/500 U)
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S7RUC7URAL EROSION AND SEDIMENT CONTROL PRACTICES SHALL BE iN ACCORDANCE WITH THE VIRGINiA EROSION AND SEDIMENT
CONTROL HANDBOOK. STRUCTURAL PRAC7ICES USED IN THiS SEC77ON CONSIST OF THE FOLLOWING:
,3 0 L SAFETY FENCE•
A PROTECTIVE BARRIER INSTALLED TO PREVENT ACCESS TO AN EROSION CONTROL MEASURE TO PROHIBIT THE UNDESIRABLE USE OF AN EROSION
CONTROL MEASURE BY THE PUBLIC APPLICABLE TO ANY CONTROL MEASURE OR SERIES OF MEASURES WW 11CH CAN BE CONSIDERED UNSAFE BY
VIRTUE OF POTENTIAL ACCESS BY THE PUBLIC.
3.02 CONSTRUCTION ENTRANCE.•
A STABILIZED PAVED CONS7RUC77ON ENTRANCE WITH A WASH RACK LOCATED AT POINT'S OF VEHICULAR INGRESS AND EGRESS ON A CONSTRUC770N
S17E TO REDUCE THE AMOUNT OF MUD 7RANSPORTED ONTO PAVED PUBLIC ROADS BY MOTOR VEHICLES OR RUNOFF. CONS7RUC770N ENTRANCES
SHALL BE INSTALLED AS SI-IOWIV ON THE PLANS TO REDUCE THE AMOUNT SEDIMENT 7RANSPOR7ED ONTO PUBLIC ROADWAYS.
3.05 S1L T FENCE.°
A TEMPORARY SEDIMENT BARRIER CONSISTING OF A SMTHE77C FILTER FABRIC S7RETCHED ACROSS AND ATTACHED TO SUPPOR7ING POSTS AND
ENTRENCHED, TO iN7ERCEPT AND DETAIN SMALL AMOUNTS OF SEDIMENT FROM DISTURBED AREAS DURING CONS7RUC770N OPERATIONS IN ORDER TO
PREVENT SEDIMENT FROM LEAVING THE SITE, AND TO DECREASE 774E VELOCITY OF SHEET FLOWS AND LOW -TO -MODERATE LEVEL CHANNEL FLOWS.
THE SILT FENCE BARRIERS SHALL BE INSTALLED DOWN SLOPE OF AREAS WITH MiNiMAL GRADES TO FILTER SEDIMENT LADEN RUNOFF FROM SHEET
FLOW AS INDICATED. THEY SHALL BE INSPECTED IMMEDIATELY AFTER EACH RAINFALL AND MAINTAINED iN ACCORDANCE WITH 7HE VIRGiNIA EROSION &
SEDIMENT CONTROL HANDBOOK (VESCH).
3 O7 STORM DRAIN INLET PROTECTION:
A SEDIMENT FILTER OR AN EXCAVATED IMPOUNDING AREA AROUND A STORM DRAIN DROP INLET OR CURB INLET: TO PREVENT SEDIMENT FROM
EN7ERING STORM DRAINAGE SYSTEMS PRIOR TO PERMANENT STABILIZATION OF TIME DISTURBED AREA. INLET PR07EC77ON APPLIES WHERE STORM
DRAIN INLETS ARE TO BE MADE OPERA77ONAL BEFORE PERMANENT STABILIZATION OF THE CORRESPONDING DISTURBED DRAINAGE AREA.
3 09 TEMPORARY DI VERSION DIM
A TEMPORARY RIDGE OF COMPACTED SOIL CONS7RUC7E.D AT THE TOP OR BASE OF A SLOPING DISTURBED AREA. TO DIVERT STORM RUNOFF FROM
UPSLOPE DRAINAGE AREAS AWAY FROM UNPROTECTED DISTURBED AREAS AND SLOPES TO A STABILIZED OUTLET. TO DIVERT SEDIMENT -LADEN
RUNOFF FROM A DISTURBED AREA TO A SEDIMENT -TRAPPING FACILITY SUCH AS A SEDIMENT 7RAP OR SEDIMENT BASIN. USE WHEREVER
STORMWATER RUNOFF MUST BE 7EMPORARILY DIVERTED TO PR07E'CT DISTURBED AREAS AND SLOPES OR RETAIN SEDIMENT ON S17E: DURING
CONS77?UC710N. THESE S7RUC7URES GENERALLY HAVE A LIFE EXPECTANCY OF 18 MONTHS OR LESS, WHICH CAN BE PROLONGED WITH PROPER
MAINTENANCE.
3.12 DI VERSION:
A CHANNEL CONS77?UC7E0 ACROSS A SLOPE WITH A SUPPORTING EARTHEN RIDGE ON THE LOWER SIDE. TO REDUCE SLOPE LENGTH AND TO
INTERCEPT AND DIVERT STORMW47ER RUNOFF TO STABILIZED OUTLETS AT NON -EROSIVE VELOCITIESS, APPLIES WHERE RUNOFF FROM AREAS OF
HIGHER ELEVATION MAY DAMAGE PROPERTY, CAUSE EROSION, OR INTERFERE NTH 174E ESTABLISHMENT OF VEGETA77ON ON LOWER AREAS, WHERE
SURFACE AND/OR SHALLOW SUBSURFACE FLOW IS DAMAGING SLOPING UPLAND, AND WHERE 774E SLOPE LENG774 NEEDS TO BE REDUCED TO MINIMIZE
SOIL LOSS
3.13 TEMPORARY SEDIMENT 7RAP.,
A TEMPORARY PONDING AREA FORMED BY CONSIRUC77NG AN EARTHEN EMBANKMENT KITH A STONE OUTLET. TO DETAIN SEDIMENT -LADEN RUNOFF
FROM SMALL DISTURBED AREAS LONG ENOUGH TO ALLOW 774E MAJORITY OF 774E SEDIMENT TO SETTLE OUT. USE BELOW DISTURBED AREAS WHERE
774E TOTAL CONTRIBUTING DRAINAGE AREA 1S LESS THAN 3 ACRES, WHERE THE SEDIMENT TRAP WILL BE USED NO LONGER THAN 18 MONTHS, AND IT
MAY BE C0NS7RUC7ED EITHER INDEPENDENTLY OR IN CONJUNC77ON K17H A TEMPORARY DIVERSION DIKE.
3.14 TEMPORARY SEDIMENT BASIN:
A TEMPORARY BARRIER OR DAM KITH A CON7ROLLED STORMWATER RELEASE STRUCTURE FORMED BY CONSTRUCTING AN EMBANKMENT OF COMPACTED
SOiL ACROSS A DRAINAGEWAY. TO DETAIL SEDIMENT -LADEN RUNOFF FROM DISTURBED AREAS IN "WET" AND `DRY" STORAGE LONG ENOUGH FOR
774E MAJORITY OF THE SEDIMENT TO SETTLE OUT APPLIES BELOW DISTURBED AREAS WHERE 774E TOTAL CONTRIBUTING DRAINAGE AREA IS EQUAL TO
OR GREATER 7HAN THREE ACRES THERE MUST BE SUFFICIENT SPACE AND APPROPRIATE TOPOGRAPHY FOR THE C0NS7RUC770N OF A TEMPORARY
IMPOUNDMENT.
3.18 OUTLET PROTEC770N.-
STRUCTURALLY LINED APRONS OR 07HER ACCEPTABLE ENERGY DISSIPA77NG DEVICES PLACED AT 774E OUTLETS OF PIPES OR PAVED CHANNEL
SEC77ONS To PREVENT SCOUR AT STORMWATER OUTLETS, TO PROTECT 774E OUTLET S7RUCTURE, AND TO MINIMIZE THE P07EN77AL FOR
DOWNS77?EAM EROSION BY REDUCING THE VELOCITY AND ENERGY OF CONCEN7RA IED STORMWATER FLOWS APPLICABLE TO 774E OUTLETS OF ALL
PIPES AND ENGINEERED CHANNEL SECTIONS.
3.19 RIPRAP:
A PERMANENT, EROSION -RESISTANT GROUND COVER OF LARGE, LOOSE ANGULAR STONE KITH FILTER FABRIC OR GRANULAR UNDERLINING TO
PR07E"CT 774E SOIL FROM 774E EROSIVE FORCES OF CONCENTRATED RUNOFF SLOW 774E VELOCITY OF CONCENTRATED RUNOFF WHILE ENHANCING THE
P07EN77AL FOR iNFTL7RAT70N, AND TO STABILIZE SLOPES KITH SEEPAGE PROBLEMS, AND/OR NON -COHESIVE SOILS USE WHEREVER SOIL AND WATER
iN7FRFACE AND THE SOiL CONDITIONS, WATER TURBULENCE AND VELOCITY, EXPECTED VEGETATIVE COVER, ETC., ARE SUCH THAT THE SOIL MAY
ERODE UNDER THE DESIGN FLOW CONDITIONS.
3.20 ROCK CHECK DAMS:
SMALL TEMPORARY STONE DAMS CONSTRUCTED ACROSS A SWALE OR DRAINAGE DITCH. TO REDUCE 774E VELOCITY OF CONCENTRATED STORMW47ER
FLOWS, THEREBY REDUCING EROSION OF 774E SWALE OR DITCH. THIS PRAC77CE ALSO 7RAPS SEDIMENT GENERA7ED FROM ADJACENT AREAS OR THE
DITCH ITSELF, MAINLY BY PONDiNG OF THE STORMWATER RUNOFF: THIS PRAC77CE, U77LIZiNG A COMBiNA77ON OF STONE SIZES, IS LIMITED TO USE IN
SMALL OPEN CHANNELS WHICH DRAIN 10 ACRES OR LESS.
3.31 TEMPORARY SEEDING:
THE ESTABLISHMENT OF A TEMPORARY VEGETA77VE COVER ON DISTURBED AREAS BY SEEDING NTH APPROPRIATE RAPIDLY GROWING ANNUAL PLANTS.
TO REDUCE EROSION AND SEDiMENTA77ON BY STABILIZING DISTURBED AREAS THAT WILL NOT BE BROUGHT TO FINAL GRADE FOR A PERIOD OF MORE
THAN 30 DAYS TO REDUCE DAMAGE FROM SEDIMENT AND RUNOFF TO DOW9VS7REAM OR OFF-S17E AREAS, AND TO PROVIDE PR07EC77ON TO BARE
SOILS EXPOSED DURING CONS7RUC77ON UN77L PERMANENT VEGETA77ON OR OTHER EROSION CONTROL MEASURES CAN BE ESTABLISHED.
3.32 PERMANENT STABILIZATION:
774E ESTABLISHMENT OF PERENNIAL VEGETA77VE COVER ON DISTURBED AREAS BY PLAN77NG SEED. TO REDUCE EROSION AND DECREASE SEDIMENT
YIELD FROM DISTURBED AREAS. TO PERMANENTLY STABILIZE DISTURBED AREAS IN A MANNER THAT IS ECONOMICAL, ADAPTABLE TO S17E- CONDITIONS,
AND ALLOWS SELEC77ON OF THE MOST APPROPRIATE PLANT MATERIALS. TO IMPROVE WILDLIFE HABITAT. TO ENHANCE NATURAL BEAUTY. UPON
COMPLE71ON OF CONSTTUC770N ACTIVITIES, ALL AREAS WILL RECEIVE A PERMANENT VEGETA77VE COVER.
3.35 MULCHING,•
APPLICA77ON OF PLANT RESIDUES OR OTHER SUITABLE MATERIALS TO THE SOIL SURFACE. TO PREVENT EROSION BY PR07EC77NG THE SOIL SURFACE
FROM RAINDROP IMPACT AND REDUCING THE VELOCITY OF OVERLAND FLOW. TO FOSTER 774E GROWTH OF VEGETA77ON BY INCREASING AVAILABLE
MOISTURE AND PROVIDING INSULA77ON AGAINST EXTREME HEAT AND COLD. AREAS W 41CH HAVE BEEN PERMANEN7LY SEEDED SHOULD BE MULCHED
IMMEDIATELY FOLLOWING SEEDING. AREAS W41CH CANNOT BE SEEDED BECAUSE OF 774E SEASON SHOULD BE MULCHED USING ORGANIC MULCH.
MULCH MAY BE USED TOGETHER WITH PLAN77NGS OF TREES, SHRUBS, OR CERTAIN GROUND COVERS WHICH DO NOT PROVIDE ADEQUATE SOIL
STABILIZATION BY THEMSELVES, CAN BE USED IN CONJUNC77ON KITH TEMPORARY SEEDING.
3.37 TREES SHRUBS VINES e GROUND COVERS:
STABILIZING DISTURBED AREAS BY ESTABLISHING VFGE7A77VF COVER 161774 7REES, SHRUBS, VINES, OR GROUND COVERS. TO AID iN STABILIZING SOIL
..
WHERE VEGETATION OVER THAN TURF IS PREFERRED TO PROVIDE F FOR
IN AREAS FOOD AND SHELTER OR KIL , DLIFE WHERE KILDLIFE HABITAT IS
DESIRABLE. APPLIES IN AREAS MERE TURF ESTABLISHMENT IS DIFFICULT, ON S7E-EP OR ROCKY SLOPES WHERE MOWING 1S NOT FEASIBLE, WHERE
ORNAMENTALS ARE DESIRABLE FOR LANDSCAPING PURPOSES, AND WHERE WOODY PLANTS ARE DESIRABLE FOR SOiL CONSERVA770N, OR TO
ESTABLISH WILDLIFE HABITAT
3.38 TREE PRESERVA77ON AND PROTECTION:
PR07EC77ON OF DESIRABLE 77?EES FROM MECHANICAL OR OTHER INJURY DURING LAND DISTURBING AND CONS7RUC77ON ACTIVITY. TO ENSURE THE
SURVIVAL OF DESIRABLE 7REES WHERE THEY WILL BE EFFEC77VE FOR EROSION AND SEDIMENT CONTROL, WATERSHED PROTEC770N, LANDSCAPE
BEAUTIFICATION, DUST AND POLLUTION CONTROL, NOISE REDUCTION, SHADE AND OTHER ENVIRONMENTAL BENEFITS WHILE 774E LAND iS BEING
CONVERTED FROM FOREST TO URBAN -TYPE USES APPLIES IN 7REE=-INHABI7ED AREAS SUBJECT TO LAND DISTURBING ACTIVITIES
3.39 DUST CONTROL:
REDUCING SURFACE AND AIR MOVEMENT OF DUST DURING LAND DISTURBING, DEMOL177ON AND CONS7RUC770N AC77V777ES TO PREVENT SURFACE AND
AIR MOVEMENT OF DUST FROM EXPOSED SOIL SURFACES AND REDUCE 774E PRESENCE OF AIRBORNE SUBSTANCES WHiCH MAY PRESENT HEALTH
HAZARDS, TRAFFIC SAFETY PROBLEMS OR HARM ANIMAL OR PLANT LIFE: DUST CONTROL MEASURES SHALL BE EMPLOYED TO PREVENT SURFACE
AND AIR MOVEMENT OF DUST DURING CONSTRUCTION. MEASURES EMPLOYED SHALL BE IN ACCORDANCE WITH 774E VESCH.
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DIVERSION
EROSION CONTROL NOTES
ES 1: UNLESS OTHERWISE INDICATED, ALL VEGETA Ti VE AND S7RUCTU RAL EROSION
AND SEDIMENT CONTROL PRACTICES WILL BE CONS7RUCTED AND MAINTAINED
ACCORDING TO MINIMUM STANDARDS AND SPECIF7CA 77ONS OF 774E VIRGINIA
HANDBOOK AND VIRGINIA EROSION AND SEDIMENT CONTROL REGULATIONS VR
625-02-00 EROSION AND SEDIMENT CONTROL REGULATIONS
ES-2. THE PLAN APPROVING AU77-IORiTY MUST BE N077FIED ONE WEEK PRIOR TO THE
PRE-CONS7RUC770N CONFERENCE, ONE WEEK PRIOR TO THE COMMENCEMENT
OF LAND DISTURBING ACTIVITY, AND ONE WEEK PRIOR TO THE FINAL
INSPECTION:
ES-3.•ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRIOR
TO OR AS THE FIRST STEP IN CLEARING
ES-4: A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL PLAN SHALL BE
MAINTAINED ON 774E SITE AT ALL TIMES.
ES-5.-PRIOR TO COMMENCING LAND DISTURBING AC77W77ES IN AREAS OTHER 77-IAN
INDICATED ON THESE PLANS (INCLUDING BUT NOT LIM17ED TO, OFF SITE
BORROW OR WA57E AREAS), 774E CONTRACTOR SHALL SUBMIT A
SUPPLEMENTARY EROSION CONTROL PLAN TO THE OWNER FOR REVIEW AND
APPROVAL BY THE PLAN APPROVING AUTHORITY.
ES-6: THE CONTRACTOR IS RESPONSIBLE FOR INSTALLATON OF ANY ADD177ONAL
EROSION CONTROL MEASURES NECESSARY TO PREVENT EROSION AND
SEDIMENTA77ON AS DETERMINED BY THE PLAN APPROVING AUTHORITY.
ES-7.•ALL DISTURBED AREAS ARE TO DRAiN TO APPROVED SEDIMENT CONTROL
MEASURES AT ALL 77MES DURING LAND DISTURBING AC77W77ES AND DURING
S17E DEVELOPMENT UNTIL FINAL STABiLIZA77ON IS ACHIEVED.
ES-8. DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN
APPROVED WATER FILTERING DEVICE.
ES-9: THE CON7RACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES
PERIODICALLY AND AFTER EACH RUNOFF -PRODUCING RAINFALL EVENT ANY
NECESSARY REPAIRS OR CLEANUP TO MAINTAIN THE EFFEC77VENESS OF T74E
EROSION CON7ROL DEVICES SHALL BE MADE IMMEDIATELY.
Gvmerid construction notes for Erosion Suitt Scclinlent Colitrol plus
J. The plan approving authority must be notified one week prier to the pre -construction
eonfzrence, one week prior to the conxmencement of land disturbing activity, and one week
prior to the final irtapcctlon.
2, All erosion and sediment control measures will be constructed, and maintained according to
mittimuni standards and specifications of the Virginia Erosionand Sediment Control
Handbook and Virginia Rogulatiom VR 625-02-00 Erosion and Sediment Control
Regulations,
3. All erosion and sediment control measures are to be placed prior to or m the first step in
Clearing.
4. A copy of the approved erosion and sediment control plan shall be maintained on the site at
all times.
5_ Prior to commencing land disturbing activities. in areas other than indicated on these plans
itzcluclitig; but not l Ixutcci to, cuff-szic borrow or wasV arras), the contractor shall s4 1 t a
supplementary erosion control _lain to the owner for review and approval al b r the plan
1?I? � p p0 � p
approving authority.
6. The contractor is responsible for installation of any additional erosion control measures
necessary to prevent erosion and sedimentation as determined by the plan approving
authority
7. All disturbed areas are to drain to approved sediment control measures at Kill times during
land disturbing activities and during site development until final stabilization is achieved.
S. Duringdewateria operations, water will be uni ed into ail a roved filtering device.
g Ir A 17 Ply g .
9. The contractor shall inspect all erosion control measures periodically and after each rtlaoff-
producina rainfall event. Any necessary cepairs or cleanup to inaintain the effectiveness of
.theerosion control devices shall be made immediately,
10, All fall material to be taken from an approved, designated borrow azea.
11. All waste materials shall be taken to an approved waste area. Earth fill shall be inert
materials only., free of roots, stomps, wood, rubbish, and other debris.
12. Borrow or waste areas are to he reclaimed within 7 days of coml letion per 7,oning
Ordinancc section 5.1.28.
13� All inert materials shall be transported in compliance with section 13-301 of the Code of
Albemarle.
14. Borrow, fill or waste. activity involving industrial -type power ecluipnjent. shall bn limited to
the hours of 7:00am to 9:00ptn.
15. Burrow, fill or waste activity shall be conducted in a safe. manner than maintalns lateral
l upport, ot- order to minimize any ha.z.ard to persons, physical damage to a(ijacept land and
improvements, and damage to any public street because o slides, sinking, or collapse.
16. The, develo der shall reserve the right to install maintain remove or convert to pernmileut
l � t
c
toru ter management facilities where applicable all erosion control measures required edsmby thus plan regardless of the sale of any lot, unit, building or other portion of the Uruperty.
17. T'ernporary stabilization shall he temporary seeding and mulching. Seeding is to be at 75
bs . cr a i , to February u c:o s 't a 0150 mix of Annua
l is c, ncl n thy:_ niontlrs of 5cpternbL.I ruar� t nuts 5 <1
R c foss and Cereal Winter R e or in Mttrc,h arul A _ril to consist of Annual R, , or Mt n'
y Y P s
through August to consist of erman Millet. Straw mulch ch is to be applied at 80lbs/loose
Alternatives are subject to approved by the County erosion control inspector.
18. Permanent stabilization shall be lime and fertilizer, permanent seeding, and mulch.
r. incorporated into the; -
Agtc ulturttl Epode limestone shall be applied at 901bsI1000af, Inc orpora rn top 4 �i
inches of soil, Fertilizer shall be applied at 1000lbs/acre and consist of a 10-20-10 nutrient
mix. Permanent seeding shall tat•:. applied at 180lbsfacre and consist of 95% Kentucky 31 or
l; I
Tall Fescue. and 0-5% Perennial Ryegrass or Kentucky bluegrass. Straw nxulcIt is to be
applied at 801b8f100sf. Alternatives are subject to approved by the County erosion control
inspector-
19. Maintenance: All meastres are to be inspected weekly itnd after each rainfall.:Any dRtlxttge,
or clogging lcl structural measures is to be repairimme4laately. Silt txas are tv be tlea.nect
when 50°'0 of the wet storage volume is filled with sediment. All seeded areas are to he
reseeded when necessary to achieve a good stand of grass. Silt fence and diversion dykes
which are collecting sediment to half their height must be cleaine�.l and repaired
immediately.
0, All tc Inpurary erosion and sediment nt. control measures art to be reTliov4sl wllllxv, 0 days Of
final site stabilization, when measures are no longer needed, subject to approv. h try the
County Crosion control inspector.
?:1, This plan shall be void if the owner does not obtain a permit within 1 year of the &te of
approval. (Water Protection Ordinance section 17-2046'.)
22_ Pernipiwat vegetation ,shall be installed on all dentided areas within trine. (9), niontlrs <3lted'
the (late the land disturbing activity commenced. (Water Protection Ordinance section 17-
207B)
TABLE 331-A
LIMING REQUIREMENTS
FtOR'FEMPORARY SITES
Recommended Application
RH 'rest P1 ,/agEi ht ral Limat-cme
below 4.2 3 tons per acre
4.2 to 5.2 2 tons per acre
5.2 to 6 1 ton per acre
Source: Va. DSWC
GFNFRAL SLOPE i3:1 OR IFSSI
KENTUCKY 31 FESCUE
RED TOP GRASS
SEASONAL NURSE CROP
EXISTING CULVERT
CUL VERT
DROP INLET & STR TURE N UC O
CURB
CURB & GUTTER
PROPOSED PAVEMENT
EC-3A DITCH
DEPTH of EC-3A DITCH
EC-2 DITCH
DEP7H OF EC-2 DITCH
EARTH DITCH
DRIVEWi4Y CULVERT
BENCH MARK
CLEARING LIMITS
VDOT STANDARD STOP SIGN
EXISTING CONTOUR
PROPOSED CONTOUR
PROPOSED SPOT ELEVA77ON
IBC DEN07ES TOP/BACK OF CURB
T/B DENOTES TOP OF BOX SEASONAL NURSE CROP
FEBRUARY 16 THROUGH APRIL ANNUAL RYE
MAY 1 THROUGH AUGUST 15 FOXTAIL MILLET
AUGUST 16 THROUGH OCTOBER ANNUAL RYE
NOVEMBER THROUGH FEBRUARY 15 WINTER RYE
NOTES:
1. LIME AND FERTILIZER NEEDS SHALL BE DETERMINED BY SOIL
TESTS AND APPLIED IN ACCORDANCE WITH VESCH STD. 3.32.
2. SEEDINGS TO BE MULCHED IMMEDIATELY UPON COMPLETION
OF SEED APPLICATION, IN ACCORDANCE W/ VESCH STD 3.35,
PERMANENT SEEDING SCHEDULE
TOTAL LBS PER ACRE
128 LBS
2 LBS
20 LBS
150 LBS
NO SCALE
(STD. & SPEC;. 3.32 OF VIRGINIA EROSION &
SEDIMENT CONTROL HANDBOOK. 3RD ED.)
TABLE 3.31-B
ACCEPTABLE TEMPORARY SEEDING PLANT 141ATERIAI-S
'QUICK REFERENCE WK ALL REGIONS°
Rate
wA1i1110-i�, 5
;ice
Sept. I -Feb. 15
50/50 Mix of
Annual Ryegrm
(Lolium multi-tlorum)
& 50-100
Cereal (Winter) Rye
(Secafe cereale)
Feb- 16 - Apr. 30
Annual Ryagrass Ell - 1l}U
(iAut _Aii;11vflP_rL4n_)
May 1 - Aug 31
German Nfillet 50
(SStaria italica)
Source: Va. DSWC
CONTROL MEASURES:
EROSION AND SEDIMENT CONTROL MEASURES:
IT IS ANTICIPATED TO USE CONS7RUC770N ENTRANCES DIVERSION DIKES, EXIS71NO SEDIMENT
BASINS, AND SILT FENCES WILL BE INSTALLED TO CONTROL SURFACE DRAINAGE TEMPORARY
SEEDING WILL BE USED IMMEDIATELY FOLLOWING ALL LAND DISTURBANCE AC77w77ES.
TEMPORARY STOCKPILE AREAS WILL BE MAINTAINED FROM TOPSOIL THAT WILL BE S7RiPPED
FROM AREAS TO BE GRADED AND STORED FOR LATER SPREADING STOCKPILE LOCATIONS SHALL
BE ON S17E AND SHALL BE STABILIZED WITH A TEMPORARY VEGETA77VE COVER. PERMANENT
SEEDING WILL BE PERFORMED FOR ALL AREAS WHICH WILL NO LONGER BE EXCAVATED AND
WHERE CONS7RUC770N AC77W77ES HAVE CEASED. PERMANENT SEEDING SHALL ALSO BE
PERFORMED FOR ALL DENUDED AREAS WHICH WILL BE LEFT DORMANT FOR A YEAR OR MORE.
SELEC77ON OF SEED MiXTURE WiLL DEPEND ON THE TIME OF YEAR APPLIED.
TEMPORARY SEEDING WILL BE PERFORMED FOR ALL DENUDED AREAS WHICH WILL BE LEFT
DORMANT FOR MORE THAN SEVEN DAYS THESE AREAS SHALL BE SEEDED WITH FAST
GERMINATING VEGETA77ON IMMEDIATELY FOLLOWING GRADING OF THOSE AREAS. SELEC77ON OF
SEED MIXTURE WILL DEPEND ON 7HE 77ME OF YEAR APPLIED.
CON.S7RUC770N EN77?ANCE.•
A STABILIZED PAVED CONS7RUC770N ENTRANCE WI774 A WASH RACK LOCATED AT POINTS OF
VEHICULAR INGRESS AND EGRESS ON A CONS7RUC770N 5l7E. TO REDUCE 774E AMOUNT OF MUD
7RANSPORTED ONTO PAVED PUBLIC ROADS BY MOTOR VEHICLES OR RUNOFF.
CONSTRUC7TON ENTRANCES SHALL BE INSTALLED AS SHOWN ON THE PLANS TO REDUCE THE
AMOUNT SEDIMENT TRANSPORTED ONTO PUBLIC ROADWAYS.
A TEMPORARY SEDIMENT BARRIER CONSiS77NG OF A SM HE77C FILTER FABRIC S7RETCHE0
ACROSS AND ATTACHED TO SUPPORTING POSTS AND ENTRENCHED. TO INTERCEPT AND DETAIN
SMALL AMOUNTS OF SEDIMENT FROM DISTURBED AREAS DURING CONSTRUCTION OPERAT7ONS IN
ORDER TO PREVENT SEDIMENT FROM LEAVING 77-IE S17E TO DECREASE THE VELOCITY OF SHEET
FLOWS AND LOW -TO -MODERATE LEVEL CHANNEL FLOWS. THE SiLT FENCE BARRIERS SHALL BE
INSTALLED DOWN SLOPE OF AREAS WI7H MINIMAL GRADES TO F70ER SEDIMENT LADEN RUNOFF
FROM SHEET FLOW AS INDICATED. THEY SHALL BE INSPECTED IMMEDIATELY AFTER EACH
RAINFALL AND MAINTAINED iN ACCORDANCE 1+I771 774E VIRGINIA EROSION & SEDIMENT CONTROL
HANDBOOK (VESCH).
PERMANENT STABILIZA770N:
THE ESTABLISHMENT OF PERENNIAL VEGETA7IVE COVER ON DISTURBED AREAS BY PLANTING
SEED. TO REDUCE EROSION AND DECREASE SEDIMENT YIELD FROM DISTURBED AREAS: TO
PERMANENTLY STABILIZE DISTURBED AREAS IN A MANNER THAT IS ECONOMICAL, ADAPTABLE TO
Si7E CONDITIONS, AND ALLOWS SELEC77ON OF 774E MOST APPROPRIATE PLANT MATERIALS. TO
IMPROVE WILDLIFE HABITAT. TO ENHANCE NATURAL BEAUTY. UPON COMPLE77ON OF
C0NS7RUC77ON AC77W77ES, ALL AREAS WILL RECEIVE A PERMANENT VEGETA77VE COVER.
TEMPORARY SEEDING.•
THE ESTABLISHMENT OF A TEMPORARY VEGETA77VE COVER ON DISTURBED AREAS BY SEEDING
WITH APPROPRIATE RAPIDLY GROWING ANNUAL PLANTS TO REDUCE EROSION AND
SEDIMENTA7ON BY STABILIZING DISTURBED AREAS THAT WILL NOT BE BROUGHT TO FINAL GRADE
FOR A PERIOD OF MORE THAN 30 DAYS. TO REDUCE DAMAGE FROM SEDIMENT AND RUNOFF TO
DOWNSTREAM OR OFF-97E AREAS, AND TO PROVIDE PR07EC77ON TO BARE SOILS EXPOSED
DURING C0NS7RUC77ON UN77L PERMANENT VEGETA77ON OR OTHER EROSION CONTROL MEASURES
CAN BE ESTABLISHED.
DUST CONTROL:
REDUCING SURFACE AND AiR MOVEMENT OF DUST DURING LAND DISTURBING, DEMOLi77ON AND
CONS7RUC77ON AC77W77ES
TO PREVENT SURFACE AND AIR MOVEMENT OF DUST FROM EXPOSED SOIL SURFACES AND
REDUCE THE PRESENCE OF AIRBORNE SUBSTANCES WHICH MAY PRESENT HEAL 7H HAZARDS,
77?AFFIC SAFETY PROBLEMS OR HARM ANIMAL OR PLANT LIFE.
DUST CON7ROL MEASURES SHALL BE EMPLOYED TO PREVENT SURFACE AND AIR MOVEMENT OF
DUST DURING CONS7RUC770N. MEASURES EMPLOYED SHALL BE IN ACCORDANCE WITH 7HE VESCH.
TEMPORARY DIVERSION Di)M
A RIDGE OF COMPACTED SOIL CONSTRUCTED AT 7HE TOP OR BASE OF A SLOPING DISTURBED
AREA WHICH DIVERTS OFF -SITE RUNOFF AWAY FROM UNPROTECTED SLOPES AND TO A
STABILIZED OU7LET, OR TO DIVERT SEDIMENT LADEN RUNOFF TO A SEDIMENT ]RAPPING
S7RUC7URE. MAXIMUM EFFEC77VE LIVE IS 18 MON7745.
ROCK CHECK DAMS -
SMALL, TEMPORARY STONE DAMS CONS7RUC7E"D ACROSS A DRAINAGE DITCH TO REDUCE 7HE
VELOCITY OF CONCENTRATED FLOWS, REDUCING EROSION OF THE SWALE OR DITCH LIMITED TO
USE IN SMALL OPEN CHANNELS WHICH DRAIN 10 ACRES OR LESS, SHOULD NOT BE USED IN
LIVE STREAMS
STORM OR INLET PROTFC770N:
THE INSTALLATION OF VARIOUS KINDS OF SEDIMENT ]RAPPING MEASURES AROUND DROP INLETS
OR CURB INLET STRUCTURES PRIOR TO PERMANENT STABILIZATION OF THE DISTURBED AREA;
LIMI7ED TO DRAINAGE AREAS NOT EXCEEDING ONE ACRE, AND NOT INTENDED TO CON7ROL
LARGE, CONCENTRATED STORMW47ER FLOWS.
TEMPORARY SEDIMENT TRAP:
A SMALL PONDiNG AREA, FORMED BY CONSTRUCTING AN EARTHEN EMBANKMENT WITH A STONE
OUTLET ACROSS A DRAINAGE SWALE, TO DETAIN SEDIMENT -LADEN RUNOFF FROM SMALL
DISTURBED AREAS FOR ENOUGH 77ME TO ALLOW MOST TO 774E SUSPENDED SOLIDS TO SETTLE
OUT. MAXIMUM EFFE"C77VE LIFE IS 16 MONTHS.
TEMPORARY SEDIMENT BASIN:
A TEMPORARY BARRIER OR DAM WI7H CON7ROLLED STORMWA7E'R RELEASE STRUCTURES WHICH IS
FORMED BY CONSTRUCTING AN EMBANKMENT OF COMPACTED SOIL ACROSS A DRAINAGEWAY. IT
iS USED TO DETAIN SEDIMENT -LADEN RUNOFF FROM DRAINAGE AREAS 3 ACRES OR GREATER
FOR ENOUGH 71ME TO ALLOW MOST OF 774E SUSPENDED SOLIDS TO SETTLE OUT iT CAN BE
CONSTRUCTED ONLY WHERE THERE IS SUFFICIENT SPACE AND APPROPRIATE TOPOGRAPHY
MAXIMUM EFFEC77VE LIFE iS 18 MONTHS UNLESS DESIGNED AS A PERMANENT POND BY A
QUALIFIED PROFESSIONAL.
OUTL,F
T PRO___ - N:
7HE INSTALLATION OF RIPRAP CHANNEL SEC77ONS AND/OR 57ILLiNG BASINS BELOW STORM
DRAIN OUTLETS TO REDUCE EROSION AND UNDER-CUT77VG FROM SCOURING AT OUTLETS AND TO
REDUCE FLOW VELOCITIES BEFORE STORMWATER ENTERS RECEIVING CHANNELS BELOW THESE
OUTLETS.
CULVERT INLET PROTE'CTION.-
A SEDIMENT FILTER LOCATED AT THE INLET TO STORM SEWER CULVERTS WHICH PREVENTS
SEDIMENT FROM ENTERING, ACCUMULA77NG IN AND BEING TRANSFERRED BY THE CULVERT. iT
ALSO PROVIDES EROSION CONTROL AT CULVERTS DURING THE PHASE OF A PROJECT WHERE
ELEVATIONS AND DRAINAGE PATTERNS ARE CHANGING, CAUSING ORIGINAL CONTROL MEASURES
TO BE INEFFECTIVE.
SAFETY FENCE.•
A PR07EC77VE BARRIER INSTALLED TO PROHIBIT UNDESIRABLE USE OF AN EROSION CONTROL
MEASURE
PERMANENT , 0-IL IZA 770Ne
PERMANENT SEEDING WILL BE APPLIED TO ALL DIS7URBED AREAS AS PER THE PERMANENT
STABILIZATION OF THIS EROSION & SEDIMENT CONTROL NARRATVE
AFTER C0NS7RUC77ON IS COMPLETED, ALL DIS771RBED AREAS OF THE S17E WILL BE LIMED,
FER77LiZED, AND SEEDED AS PER CURRENT VDOT STANDARDS THIS SHALL CONSIST OF
THE FOLLOWING.• ,
TOP SOIL - 2" DEP 77-1
LIME - 2 TONS/ACRE
FER77LIZER - 600 LBS/ACRE OF 15-30-15
SEED - ERNST 5311 CONSERVA77ON SEED MIX - ERNNIX-114 (45 LBS/ACRE PENNLAWN
CREEPING RED FESCUE, 3Z5 LBS/ACRE ARGILS KEN77JCKY BLUEGRASS, 37.5 LBS/ACRE
PARK KENTUCKY BLUEGRASS, 15 LBS/ACRE ANNUAL RYEGRASS & 15 LBS/ACRE PLEASURE
PERENNIAL AFTER THESE AREAS ARE STABILIZED THEY WILL BE MOWED AND MAINTAINED
ON A REGULAR BASIS
MALIMIMANM
iN GENERAL, ALL EROSION AND SEDIMENT CONTROL MEASURES WILL BE CHECKED DAILY
AND AFTER EACH SIGNIFICANT RAINFALL. SPECIFIC AT7EN77ON WILL BE GIVEN TO THE
FOLLOWiING ITEMS.•
A. SEDIMENT BASINS AND/OR TRAPS WILL BE CLEANED AND MAINTAINED IN
ACCORDANCE WITH THE VIRGiNIA EROSION & SEDIMENT CON7ROL HANDBOOK.
B. ALL GRAVEL OUTLETS WILL BE CHECKED REGULARLY FOR SEDIMENT BUILDUP 774A T
WILL PREVENT PROPER DRAINAGE. IF THE GRAVEL IS CLOGGED BY SEDIMENT, THE
GRAVEL WILL BE REMOVED AND CLEANED, OR IT WILL BE REPLACED.
C. ALL SILT FENCE BARRIERS WILL BE CHECKED REGULARLY FOR UNDERMINING OR
DETERIORATION OF THE FABRIC AND REPAIRED AS REQUIRED. SEDIMENT SHALL BE
REMOVED WHEN THE LEVEL OF SEDIMENT DEPOS177ON REACHED HALF WAY TO 771E
TOP OF THE BARRIER.
D. ALL SEEDED AREAS WILL BE CHECKED REGULARLY TO SEE THAT A GOOD STAND IS
MAINTAINED. AREAS SHOULD BE FER77LIZED AND RESEEDED AS NEEDED.
Z
r:clrr'r-c`ae: H � '
THE PURPOSE OF THiS LAND DISTURBING ACTIVITY IS TO CREATE A STOCKPILE AREA ON �,N
THE Si7E OF THE FUTURE MAR7HA JEFFERSON HOSPITAL APARTMENTS PROJECT THE (�U-)N
S;5-
TOTAL AREA TO BE DISTURBED WITH THIS PLAN IS 12.77 ACRES: +�
T R. COLLINSZ
EXISTING SITE CONDi TIONS•
THiS S17E IS CURRENTLY WOODED AND DRAINS TO EXISTING WATERWAYS LOCATED TO THE a. 35791 ,�
EAST, WEST, AND SOUTH. AN EXIS77NG GRAVEL ROAD EXISTS ON -SITE EXISTING
PRESERVED AND MANAGED STEEP SLOPES EXIST ON -SITE 51
i��I�1�'ADJACENT AREAS• tOX L 6
THiS SiTE 15 BORDERED TO 111E NORTH BY PETER JEFFERSON PARKWAY. TO THE SOUTH
EXISTS THE RIVANNA RIVER. AN EXIS77NG COMMERCIAL PROPERTY EXISTS TO THE WEST
A CURRENTL Y VACANT MIXED -USE COMMERCIAL LOT EXISTS TO THE EAST.
OFFSITE LAND DISTURBANCE.•
NO CONSTRUCTION AC77VT77ES ARE PROPOSED OUTSIDE OF THE LIMITS OF DISTURBANCE.
CRITICAL AREAS:
CARE SHALL BE TAKEN TO PREVENT CONSTRUC77ON RUNOFF FROM ENTERING 7HE EXIS71NG
PRESERVED STEEP SLOPES ON 517E AND ADJACENT PROPERTIES.
SOILS:
SOILS MAP iS INCORPORATED INTO THE EROSION CONTROL PLANS WITH SOiLS DATA
INCLUDED WITH THIS NARRATIVE.
SEQUENCE OF CONSTRUCTION:
1. N077FY ALBEMARLE COUNTY TO SCHEDULE A PRE-CONS7RUC77ON MEE77NG AS crt
u
REQUIRED.
2. NO EROSION CONTROL MEASURES MAY BE REMOVED DURING THE CONS7RUC770N �
2
PROCESS WITHOUT 774E APPROVAL FROM THE INSPECTOR ON 174E PROJECT. 2:
2
3. INSTALL 174E PAVED CONS7RUCTI N ENTRANCE WITH WASH AREA AS SHOWN ON 77-IE 8
L
PLANS CONSTRUC77ON ENTRANCES TO BE INSTALLED WHERE CONSTRUCTION VEHICLE z
2
ROUTES INTERSECT PAVED PUBLIC ROADS, PROVISIONS SHALL BE MADE TO MINIMIZE THE o a �
TRANSPORT OF SEDIMENT BY (VEHICULAR) 7RACKING ONTO 174E PAVED SURFACE r, � �
=
WHERE SEDIMENT IS TRANSPORTED ONTO A PUBLIC ROAD SURFACE, THE ROAD SHALL v co Uj
u
BE CLEANED THOROUGHLY AT THE END OF EACH DAY. SEDIMENT SHALL BE REMOVED w U) R
FROM THE ROADS BY SHOVELING OR SWEEPING AND TRANSPOR77NG TO A SEDIMENT Vj ® _j ¢
e
CONTROL DISPOSAL AREA. STREET WASHING SHALL BE ALLOWED ONLY AFTER SEDIMENTPM4 Z Q LU
u
IS REMOVED iN 7741S MANNER. V z _
4. INSTALL THE IN177AL CONS7RUCT7ON MEASURES AS SHOWN ON THE EROSION CONTROL w ''" Ce
a
SHEET. THIS INCLUDES (1) CONS7RUCT10N EN77?ANCE, (1) SEDIMENT BASIN, (2) Ujce IL
a
SEDIMENT TRAPS, CONSTRUCTION ROAD STABILIZA770N, SiLT FENCE, AND DIVERSION MWO ®
C
Uj DIKES MEASURES INTENDED TO TRAP SEDIMENT SHALL BE CONSTRUCTED AS A FIRST
U
S7EP WITH ANY LAND DISTURBANCE ACTIVITY AND SHALL BE MADE FUNCTIONAL BEFORE 5
u
UPSLOPE LAND DISTURBANCE TAKES PLACE. Cie
°
5. ONCE ALL T7/E EROSION CONTROL ITEMS HAVE BEEN INSTALLED AS SHOWN ON 7HE
EROSION CONTROL PLAN AND THE INSPECTOR HAS APPROVED 77-IE EROSION CONTROL
MEASURES, 711E CONTRACTOR CAN BEGIN USING THE AREA SPECIFIED ON THE PLANS AS
A STOCKPILE AREA. STABILIZATION MEASURES SHALL BE APPLIED TO EARTHEN
STRUCTURES SUCH AS DAMS, DIKES, AND DIVERSIONS IMMEDIATELY AFTER INSTALLA770N.
6. PERMANENT OR TEMPORARY SOiL STABILIZA77ON SHALL BE APPLIED TO DENUDED AREAS
WITHIN SEVEN DAYS AFTER FINAL GRADE iS REACHED ON ANY POR77ON OF THE S1TE.
TEMPORARY SOIL STABILIZA7ON SHALL BE APPLIED WITHIN SEVEN DAYS TO DENUDED
AREAS THAT MAY NOT BE AT FINAL GRADE BUT WILL REMAIN DORMANT (UNDISTURBED)
FOR LONGER THAN 30 DAYS PERMANENT STABILIZATION SHALL BE APPLIED TO AREAS
THAT ARE TO BE LEFT DORMANT FOR MORE THAN ONE YEAR.
9. NO 17EM SHALL BE REMOVED UNLESS THE UPSTREAM AREAS ARE STABILIZED AND 774E
INSPECTOR GIVES PERMISSION. THE PROPOSED SEDIMENT BASIN SHALL BE CONVERTED 00 00
a
TO A PERMANENT SWIM FACILITY AFTER THE CONSTRUCTION OF THE FUTURE MARTHA t- o C>
n
JEFFERSON HOSPITAL APARTMENTS PROJECT. ca
z
10. MAINTAIN ALL EROSION CONTROL MEASURES AS SPECIFIED iN THE WRGINIA EROSION
AND SEDIMENT CONTROL HANDBOOK, REMOVING ONLY WHEN APPROVED BY THE LOCAL
PROGRAM ADMINISTRATOR IN ACCORDANCE WITH THE VIRGINiA EROSION AND SEDIMENT
CONTROL HANDBOOK.
11. ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES SHALL BE REMOVED
t9
Wrt T HIN .30 DAYS AFTER FINAL SITE STABILiZA 77ON OR AFTER THE TEMPORARY MEASURES
ARE NO LONGER NEEDED, UNLESS OTHERWISE AUTHORIZED BY THE LOCAL PROGRAM
ADMINISTRATOR. TRAPPED SEDIMENT AND THE DISTURBED SOIL AREAS RESUL77NG FROM 0)
7HE DISPOSITION OF TEMPORARY MEASURES SHALL BE PERMANENTLY STABILIZED TO T1_
PREVENT FUR774ER EROSION AND SEDIMENTATION. i.-
SOIL .DES's' I LION
7203 - RABUN CLAY - SEVERELY ERODED, 7X TO 15X SLOPES 7HESE DEEP, WELL DRAINED
SOILS ARE FOUND ON GENTLY SLOPING TO STEEP RIDGES AND MOUNTAIN SLOPES
MODERATE TO RAPID RUNOFF, WITH MODERATE PERMEABILITY.
72DJ - RABUN CLAY - SEVERELY ERODED, 15X TO 25X SLOPES. THESE DEEP, WELL
DRAINED SOILS ARE FOUND ON GENTLY SLOPING TO STEEP RiDGES AND MOUNTAIN
SLOPES. MODERATE TO RAPID RUNOFF WITH MODERATE PERMEABILITY.
73D - RABUN VERY STONY CLAY LOAM - SEVERELY ERODED, 15X TO 25X SLOPES. THESE
DEEP, WELL DRAINED SOILS ARE FOUND ON GENTLY SLOPING TO STEEP RIDGES AND
MOUNTAIN SLOPES MODERATE TO RAPID RUNOFF, WITH MODERATE PERMEABILITY
73E - RABUN VERY STONY CLAY LOAM - SEVERELY ERODED, 25X TO 45X SLOPES THESE
DEEP, WELL DRAINED SOILS ARE FOUND ON GENTLY SLOPING TO STEEP RIDGES AND
MOUNTAIN SLOPES MODERATE TO RAPID RUNOFF, KITH MODERATE PERMEABILITY.
W - WATER
ALL DENUDED AREAS WHICH WILL BE LEFT DORMANT FOR EXTENDED PERIODS OF 77ME SHALL
BE SEEDED WITH FAST GERMINATING TEMPORARY VEGETA77ON IMMEDIATELY FOLLOWING
GRADING. SELEC77ON OF THE SEED MIXTURE WILL DEPEND ON 711E 77hIE OF YEAR AND WILL
BE APPLIED TO DISTURBED ARES THAT WILL NOT BE BROUGHT TO FINAL GRADE WITHIN 30
DA YS
PLANTS SHOULD BE SELECTED APPROPRIATE TO THE SEASON AND S17E COND177ONS FROM
TABLES 3.31B AND 3.31C. N07E THAT TABLE 3.31B PRESENTS PLANTS WHICH CAN BE USED
WITHOUT EXTENSIVE EVALUA77ON OF S17E CONDITIONS; TABLE 3.31C PRESENTS MORE
IN-DEPTH INFORMA77ON ON THE PLANT MATERIALS
TO CONTROL EROSION ON BARE SOIL SURFACES, PLANTS MUST BE ABLE TO GERMINATE AND
GROW. SEEDBED PREPARA77ON IS ESSENTIAL.
AN EVALUA77ON SHOULD BE CONDUCTED TO DETERMINE iF LIME IS NECESSARY FOR
TEMPORARY SEEDING TABLE 3.31A MAY BE USED TO DETERMINE THE ACTUAL NEED ALONG
WITH SUGGESTED APPLICA77ON RATES:
FERTILIZER SHALL BE APPLIED AS 600 LBS/ACRE OF 10-20-10 (14 LBSj1, 000 SO. FT.) OR
EQUIVALENT NUTRIENTS LiME AND FER77LIZER SHALL BE INCORPORATED INTO THE TOP 2 TO
4 INCHES OF THE SOiL iF POSSIBLE
IF THE AREA HAS BEEN RECENTLY LOOSENED OR DISTURBED, NO FUR774ER ROUGHENING IS
REQUIRED. WHEN THE AREA IS COMPACTED CRUSTED, OR HARDENED, THE SOIL SHALL BE
LOOSENED BY DISCING, RAKING, HARROWING OR OTHER ACCEPTABLE MEANS TRACKING W17H
BULLDOZER CLEATS IS MOST EFFECTIVE ON SANDY SOiLS THIS PRAC77CE OFTEN CAUSES
UNDUE COMPACTION OF THE SOIL SURFACE, ESPECIALLY IN CLAYEY SOILS, AND DOES NOT
AID PLANT GROWTH AS EFFE077VELY AS OTHER ME774DDS OF SURFACE ROUGHENING
SEED SHALL BE EVENLY APPLIED WI774 A BROADCAST SEEDER, DRILL, CUL 77PACKER SEEDER
OR HYDROSEEDER. SMALL GRAINS SHALL BE PLANTED NO MORE THAN 1j INCHES DEEP.
SMALL SEEDS, SUCH AS KEN7UCKY BLUEGRASS, SHOULD BE PLANTED NO MORE THAN j
INCH DEEP. OTHER GRASSES AND LEGUMES SHOULD BE PLANTED FROM 4 INCH TO I DEEP.
SEEDINGS MADE IN FALL FOR WINTER COVER AND DURING HOT AND DRY SUMMER MONTHS
SHALL BE MULCHED ACCORDING TO MULCHING, STD. & SPEC. 3.35, EXCEPT THAT
HYDROMULCHES (FIBER MULCH) WiLL NOT BE CONSIDERED ADEQUATE: STRAW MULCH SHOULD
BE USED DURING THESE PERIODS
AREAS WHICH FAIL TO ESTABLISH VEGETA77VE COVER ADEQUATE TO PREVENT RILL EROSION
WILL BE RE -SEEDED AS SOON AS SUCH AREAS ARE IDENTIFIED.
STORMWA7ER MANAGEMENT 711E STORMWATER RUNOFF FROM THIS PROJECT DRAINS
TEMPORARILY TO 774E PROPOSED SEDIMENT BASIN & SEDIMENT TRAP. 7HE SEDIMENT BASIN
WILL BE CONVERTED TO A PERMANENT STORMWATER MANAGEMENT FACILITY AND THE
SEDIMENT 7RAP WILL BE REMOVED AFTER THE DEVELOPMENT OF THE MAR7HA JEFFERSON
APARTMENTS PROJECT.
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SHEET NO.
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f
Project MJH Apartnents - Sbckpile Area
Plan Sheet No.
Designer AML, PE
Sheet 1 of 2
Culvert 91
Rev. Dad
T� Date 0118
AH1N Contols
STATION:
HYDROLOGICAL DATA:
100 yr. Flood plain
eieu.
Design AHW depth
elev.
Structures
elev.
teq. TVMev.
Gulvert#1: DA=2.07 ac., Gw=0.45, Tc=9.5 min., 2-year Q=3.96 ds,10-year Q=5.31
Cfs
Shoulder
I
elev. 414.00
=
CL
eiev. 414.00
DISCHARGES USED
RISK ASSESSMENT2
ADT
Skew
°
Cover "
Q 2 = 3.96 CFS
DebursAvailable Length
Q 10 = 5.31 CFS
Overtopping in Stage
Q - CFS
Flood Plain Management
Inv. El. 412.00
So--
4.00% Inv. El. 410.00
Q - CFS
Cri ria and SignikcantErr{aact
06g. Gr. Elev.
L=
60.00 Orig. G�. Etev.
Q - _ CFS
HEADWATER COMPUTATIONS
CONT
OUTLET-
End
INLET CONT.
OUTLET CONTROL
CULVERT TYPE & SIZE
Q
QtB
HK
VELOCITY
Treat
COMMENTS
HVWD
HW
Ke
do
(dc4DY2
Ito
H
LSo
HW
7U.M.
Smooth
ELEV.
Proposed 18" CMP Culvert (2 yr)
3.96
3.96
0.80
1.2
0.5
0.6
0.93
0.93
0.2
2.0
-0.9
1.2
5.87
ES-1
VDOT STD. EC-1 C lass Al Outlet Proleclion
Proposed 18"CMPCulvert(10yr)
5.31
5,31
0.95
1A
0.5
0.8
1.03
1.03
076
2,0
1 -0.4
1.4
6.35
1992
SILT FENCE C UL VE'R T INL E' T
PR O TEC TION
V- ENDWALL
---------------
TOE OF FILLL-
- s L- TOE OF FILL
SLT FENCE .
°DISTA.NCE IS 6' MINIMUM IF FLOW
IS TOWARD EMBANKMENT
L FLOW
OPTIONAL STONE COMBINATION
FLOW ti
2.5'
SS I RIPRAP
V40T #J. #3$Y OR #5 COARSE AGGREGATE
TO REPLACE SILT FENCE 'N " HORSESHOE WHEN
HIGH
.VELOCITY
OFFLOW
IS EXPECTED -
Source, Adapted from VDOT Standard
Sheets and Va. DSWC
ave4 +In4Alnhruvwx tutramv for. wasion conlralphm
Oe
�,R,�a� I�Iy�tl%It, Galt:
fit• P#$ tl',* �t�"��r� �� T±?s_ i'tlt
SAFETY FENCE
PERSPECTIVE VIEW
PERSPECTIVE VIEW PERSPECTIVE VIEW
PLASTIC FENCE METAL FENCE
Source- Adopted from Conwed Plastics and
VD0TBSM 1.jWZg atandrtrt5
3.0
Plate 3.08-1
Plate 3,01-1
1992
Is
TEMPORARY RIGHT-OF-WAY
DIVERSIONS
TYPICAL GRAVEL STRLfCTURE
TYPICAL EAR` 14EN STRUCTURE
SOUILCe: VA_ DSWC
FENCING AND
ARMORING
DRIP LINE -�
SNOW FENCE
HOARD FENCE
CORRECT METHODS OF TREE FENCING
tti l
CORRECT
TRIANGULAR BOARD FENCE
L ll _r. VtJ11lLJL VVlY LLLLV1Yl�J
A A
=- - PIPE OUTLET TO FIAT
R AREA WITH NO DEF[NED
CHANNEL
PLAN VIEAY
L d
- a
r- _T_
SECTION A -A FILTER CLOTH KEY IN 0= 9r; RECOMMENDED FOR ENTIRE PERIMETER
A
A 3dO (MIN)- -
PIPE QU'ILEr TO WELL
DEFINED CHANNEL
PLAN VIEW -
--La
(-- d
SGCI'ION A -A
FILTER CLOTH KEY IN 0"-V RECOMMENDED FOR ENTIRE PERIMETER
NOTES: 1. APRON LINING MAY BE RIPRAP, GROUTED RIPRAP, OABION
BASEST, OR CONCRETE.
3 La Ia TEE LENGTH OF THE RIPRAP APRON AS CALCULATED
USING PLATES 3,18-3 AND 3AU-4,
3. " 1.5 T[tdES TI.t1; hIAX7MUAt STONE D[AMTETER. BUT NO'T
LESS TITAN 6 INCITES.
Plate 3.11-1 T
Source: Va. DSWC
:NCE
ARMORING
1992
Plate 3.18-1
3.32
TABLE 3.32-LD
9FfE: SPECIFIC SEEDING MIXTURES FOR PIEDMONT ONT .AREA
Total Lbs.
Per Acre
[yHruratlrn care "wn
- Cormnercial or Residential
175-200 IWF
- Kentucky 31 or Turf -Type Tail Fescuce
95.100%
Improved Perennial Ryegrass
0-51%,
Kentucky Bluegrass
0-50/4,
h-]lain tgnanc� lawn
200-250 lbs.
Kentutkl 31 or Turf -Type Tall Fe.strue
100%
('ne-ral Slope (3 1 qI. Tess
- Kentucky 31 FeseuC
128 lbs.
- Red Top Grass
2 lbs.
Seasonal Nurse Crop '
20 lb&
150 lbs.
L.p y-Myint flame nc�typo, 4.Steeper than 3,1)
- ifienlugky M Fescue
1.08 lbs.
Red Tap Grass
2 lbs,
Seasonal Nurse Crop '
20 lbs,
Crownvetch "`
20 lbs'
150 lbs.
' Use seasonal nurse crop in accordance with seeding dates as stated below-
February 16th through April _ .. - . - .............. . .
Annual Rye
May 1st through August 15th .....................
Foxtail Millet
August lfith through October , , ...... . . . . ..... . . ...
.Annual Rye
November through February 15th ......... . . . . .. . .. .
Winter Rye
Substitute Sericea lespedeza for Crownvetcb cast of Farmvitic, Va. (May
through Scptclnber use hullcd Sericea, all other periods, use unhul.led
Sericea),
If Flatpea is used in lieu of Crowavetch, increase rate to 30 tbs./acre- All leguane
seed must be properly inoculated. Weeping Lovegrass may be added) to any slope
or low -maintenance mix during warmer seeding periods; add 10-20 lbs./acre in
mixes.
11 it I
RISER CREST ELEVATION
4'
POSTS MIN. SIZE 4" SQUARE
I i OR 5" ROUND. SET AT
&, LEAST 3' INTO THE GROUND
SEDIMENT BASIN BAFFLE DETAIL
NO SCALE
Sediment Trap ##2 Design
drainage area (acres) (<3)
1.26
trap volumes:
I I�ARML£
1
I
elevation (ft) area (sf) volume(cf)
volume(cy)
C t
368.00 432.0 0
0.0
MORk- CREST OF STONE WEIR
ELEY.NO
Lvpmmz
370.00 660.0 1,084
40.1
+.a
372.00 921.0 2,658
98.4
374.00 1538.0 6,091
188.5
DRY STORAGE
376.00 2282.0 8,886
329.1
378.00 3135.0 14,281
528.9
wer srnftAGE
(EXCAVATED)
FILTER ctorTt n
env
wet storage:
wet storage required (cy) (67*DA)
84.4
♦56E PLATE 3.13-1
COARSE AGGREGATE CLASS I REpRAi*
bottom of stone weir (ft)
372.00
wet storage provided at this elevation (cy)
98.4
slope of wet storage sides
1:1
weir length (ft) (6xDA)
7.6
dry storage:
bottom of trap elevation (ft)
368
dry storage required (cy) (67*DA)
84.4
bottom trap dimensions:
43'xl0'
crest of stone weir
377.00
tap of dam elevation (ft)
378.00
dry storage provided at this elevation (cy)
330.6
top width of dam (ft)
5
slope of dry storage sides
2:1
top trap dimensions
75'A2'
Sediment Trap #1 Design
drainage area (acres) (<3)
1.78
trap volumes:
elevation (ft) area (sf) volume(cf)
volume(cy)
352.00 78.0 0
0.0
pR 49VA1 CREST OF STONE WEIR
GROUNDELM
ypRU '
354.00 908.0 835
30.9
356.00 2834.0 4,399
162.9
358.00 5217.0 12,330
456.7
DRY STORAGE �
vALE'
360.00 8001.0 25,449
942.5
WET STORAGE 4, eauc. 7
(EXGAVAtErk�
FRIER CLOTH ORO NA'
crzoutap
Etft
gmfogl
VA
MIMI .1
wet storage:
-
vuet storage required (cy) (67*DA)
119.3
•see HATE 3.a3 ,
ccu Acrr rATe class z R!PaAP
a
bottom of stone weir (ft)
356.00
tf i
i CON' RACTOR�SHALL INSTALL HE CR
wet storage provided at this elevation (cy)
162.9
i DET NTION C LL EMBANKMENT, RISE
IBARREq, OUTLETPROTECTION &,qPILLWARAT i t
slope of wet storagesides s
e
4:1
length DA)
10.7 (min.)
tTHE TIME OF ST#1'a CO STRUdIO�d. RI�ER
weir (ft) (6)
1 SHALLBE SEALED WAT RTIGHT UNTIL rtf HE
j
dry storage:
bottom of trap elevation (ft)
362
SIN IS CONVE TED TOIA PERMANENT WM
dry storage required (cy) (67*DA)
119.3
bottom trap dimensions:
23'xia'
CILI . CONV RSION SHALL ONLY OCCUR I
AFTE ESC IN�PECT R APRR VAL. S E i
crest of stone weir
3%00
top of dam elevation (ft)
360.00
SQET 8 FORA DITIONAL DESI N DETILS.
q r l
dry storage provided at this elevation (cy)
536.7
top width of dam (ft)
10
1 I i
47
SILT FENCE
S(WITH WIPE SUPPORT) . o�--
NO SCALE
4. BACKFILL AND COMPACT THE
EXCAVATED SOIL.
W
EXTENSION OF FABRIC AND WRE INTO THE TRENCH.
I f PROPOSED SAFETY
e _ FENCE AROUND l
SEDIMENT TRAP
f
ATTACH FILTER FABRIC TO STAKES OR POSTS &
EXTEND IT INTO TRENCH
pW�OODEN STAKE
STEEL POST
LENGTH = Y MIN.
GKyFIt AOPIP
COMPACTED
4 x4" TRENCH
SIL T FENCE
s� (!fit THOU WRE SU��®�T,� -05®
NO SCALE
TH p>
SCOTT R. COLLINS
No. 35791
TONAL
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DA B- UGD
4.56 ac.
CN=83.0
Tc= 0.10 hrs.
,\11, \il
;f 'k-----------------
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1
STORMWATER MANAGEMENT NARRATIVE:
OVERVIEW H
THIS PROJECT IS FOR THE DEVELOPMENT OF AN APARTMENT COMPLEX, AND ITS ASSOCIATED INFRASTRUCTURE. STORMWATER TREATMENT IS PROVIDED TO MITIGATE THE
IMPACTS FROM THE PROPOSED IMPROVEMENTS. THE STORMWATER MANAGEMENT PLAN COMPLIES WITH PART IIB SWM REQUIREMENTS.
WATER gUALITY SUMMARY
THE PROPOSED DEVELOPMENT REQUIRES A TOTAL PHOSPHOROUS REMOVAL RATE OF 13.17 Ibs/yr. THE STORMWATER QUALITY REQUIREMENTS FOR THIS DEVELOPMENT ARE ® SCOTT R. COLLINSZ
MET THROUGH TWO BEST MANAGEMENT PRACTICES. THE BEST MANAGEMENT PRACTICE OF INSTALLING A LEVEL II WET POND TREATS MORE THAN HALF OF THE PROPOSED No. 35791
IMPROVEMENTS. THE LEVEL II WET POND PROVIDES A PHOSPHOROUS REMOVAL RATE 6.93 Ibs/yr. THE REMAINING WATER QUALITY BALANCE OF 6.24 Ibs/yr OF
PHOSPHOROUS WILL BE MET VIA THE BEST MANAGEMENT PRACTICE OF PURCHASING NUTRIENT CREDITS.
THSUMMARY
E PROPPO5 DTLTEVYEL II WET POND (DA A) CAPTURES MORE THAN HALF OF THE PROPOSED IMPROVEMENTS & ATTENUATES ITS SUBAREA's RUNOFF, A SIGNIFICANT PORTION ` 10NAL 0� c
OF THE REMAINING PROPOSED IMPROVEMENTS RECEIVES WATER QUANTITY TREATMENT IN SUBAREA B. SUBAREA B RECEIVES INITIAL ATTENUATION IN A PROPOSED i
UNDERGROUND DETENTION SYSTEM (DA B-UGD). THIS RUNOFF IS THEN DIRECTED TO THE PROPOSED DRY DETENTION CELL (DA B-TOTAL) FOR SECONDARY WATER S
QUANTITY TREATMENT. SUBAREA C RELEASES A SMALL AMOUNT OF RUNOFF THAT IS LESS THAN OR EQUAL TO 1% OF THE DOWNSTREAM RECEIVING CHANNEUs OVERALL -
WATERSHED. THE PROPOSED PLAN COMPLIES WITH MINIMUM 9 VAC 25-870-66 REQUIREMENTS. PLEASE SEETHE ATTACHED CALCULATIONS PACKET FOR EVIDENCE OF L
THIS PROJECT's CHANNEL AND FLOOD PROTECTION COMPLIANCE.
Proposed Impervious Area Summary
(DA A, Water Quantity)
Proposed Buildings
52,750 sf
Proposed Pool & Community Space
11,475 sf
Proposed Sidewalk
14,925 sf
Proposed Parking & Access
86,475 sf
165,625 sf
Proposed Impervious Area Summary
(DA B - Total, Water Quantity)
Proposed Buildings
44,375 sf
Proposed Sidewalk
13,125 sf
Proposed Parking & Access
66,625 sf
124,125 sf
Proposed Impervious Area Summary
(DA B - UGD, Water Quantity)
Proposed Buildings
38,200 sf
Proposed Sidewalk
13,125 sf
Proposed Parking & Access
66,625 sf
117,950 sf
Proposed Impervious Area Summary
(DA C, Water Quantity)
Proposed Sidewalk
525 sf
Proposed Parking & Access
8,575 sf
9,100 sf
Proposed Impervious Area Summary
WaterQuality)
Proposed Buildings
97,125 sf
Proposed Pool & Community Space
11,475 sf
Proposed Sidewalk
29,960 sf
Proposed Parking & Access
165,025 sf
303,585 sf
I I I I I I I I IC.
.
9
1
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Watershed
LU
<5
Summary
U
CN
Area 1-Year Flow
2-Year Flow
10-Year Flowj
DA A (Present) 64.2
7.62 4.49
8.04
20.87
C
i
DA A (Developed) 84.4
6.02 0.92
2.85
13.23
(
Q
+�
W A
3
CN
Area 1-Year Flow
2-Year Flow
10-Year Flow
o
DA B (Present) 60.6
4.09 1.55
3.09
9.29
a
DA B - Total(Developed) 81.2
5.21 0.45
0,64
8,98
CY)
LU
a
c
o
CN
Area 1-Year Flow
2-Year Flow
10-Year Flow
<
W
DA C (Developed) 77.1
0.48 0.80
1,13
2.31
Area Summary
H
C'
Pre -Development DA A & B
11.71 ac.
>
z °
Post -Development DA A, B & C
11.71 ac.
6
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v
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«,
Existing Impervious Area Summary
(DA A- Water Quantity)
Lij o
Existing Gravel Access 2,250 sf
L9
Lij
/�
4
! Fi
Storm Rae" Kau nd Series for Concrete Manhole
STORMWATER
MANAGEMENT
FACILITY
GRADING
Elevation
Area of Forebay
Volume
Elevation
Area of Wetland
Volume
(ft)
Cell Contours (sf)
(Cf)
(ft)
Cell Contours (sf)
(Cf)
376
505
0
376
-
-
378
1,534
1,946
378
-
-
379
2,187
3,797
379
328
0
380
2,933
6,348
380
878
581
382
-
-
382
-
-
384
-
-
384
-
-
PROPOSED 2' WIDE FOREBAY CONSTRUCTED
OF GABION BASKETS FILLED WITH VDOT CL.
Aa. STONE. TOP OF FOREBAY DAM ELEV. IS
38o'. FOREBAY TO INCLUDE A:Lo' WIDE, a' DEEP
WEIRTO CONVEY FLOWS TO THE WETLAND
CELL. FOREBAY WEIR CREST ELEV.=379.0'.
390 4
Elevation
Area of Main Cell
Volume
(ft)
Contours (sf)
(Cf)
376
177
0
378
1,089
1,137
379
2,197
2,748
380
4,500
6,028
382
-
-
384
-
-
PROPOSED 2' WIDE FOREBAY CONSTRUCTED
OF GABION BASKETS FILLED WITH VDOT CL.
STONE. TOP OF FOREBAY DAM ELEV. IS
380'. FOREBAY TO INCLUDE A io' WIDE, a' DEEP
WEIR TO CONVEY FLOWS TO THE MAIN CELL.
FOREBAY WEIR CREST ELEV.=379.O'.
Elevation
Total Facility Area
Volume
(ft)
Contours (sf)
(Cf)
376
682
0
378
2,623
3,095
379
4,712
6,712
380
8,311
13,139
382
14,412
35,584
384
20,500
70,317
EMBANKMENT NOTES:
AFTER AN INVESTIGATION OFTHE SITE'S SOILS, SITE VISITS, AN ANALYSIS OF
THE SURVEYED TOPOGRAPHY AND AN EXAMINATION OF VA DEC! APPENDIX A:
EARTHEN EMBANKMENT (REQUIREMENTS vs. RECOMMENDATIONS), THE
APPLICANT HAS PROVIDED A COMPREHENSIVE EMBANKMENT DESIGN THAT
DOES NOT NEED A GEOTECHNICAL STUDY AT THIS TIME. SUCH IS THE CASE
DUE TO THE PRECAUTIONARY EMBANKMENT DESIGNS PROPOSED. A
SUMMARY OF THE EMBANKMENT DESIGN REQUIREMENTS ARE LISTED
BELOW, MANDATING THE CONTRACTOR MEET THESE REQUIREMENTS AT A
MINIMUM.
THE EMBANKMENTS SHALL HAVE A COMPACTED CLAY CORE WITH A CUTOFF
TRENCH & BE IN ACCORDANCE WITH THE DETAILS SHOWN ON THIS SHEET.
BERMS AND SPILLWAYS SHALL BE STABILIZED WITH EC-3 MATTING WHERE
RIPRAP IS NOT PROPOSED, AND THE REMAINING DISTURBED SLOPES SHALL BE
STABILIZED WITH EC-2 MATTING. ALL ADDITIONAL BERM FILL MATERIAL SHALL
CONSIST OF ML, CL, SC OR GC SOILS & BE FREE OF WOOD, ROOTS, ROCKS OR
ANY OTHER NON COMPACTING SOIL COMPACTED FILL SHALL BE PROCTOR
MAXIMUM DRY DENSITYASTM D698 AND HAVE A MINIMUM OF 95% OF
MAXIMUM DRY DENSITY AND 2%OF OPTIMUM MOISTURE CONTENT. ALL FILL
MATERIAL AND PROPOSED CONSTRUCTION SHALL BE APPROVED BY AN
ONSITE GEOTECHNICAL ENGINEER PRESENT DURING THE CONSTRUCTION OF
THE EMBANKMENTS AND FILLAREAS.
e
—PROF
OSED M
SE= 380
0'
I
/
(PERMA
NENT POOL
DEPT
=y')
PROPOSED
10'
(ESC RIM
ELEV
=381.25)
TO REP
IAIN. CO
4TRACTOR
SHALL
MODIFY
THE TOP
385
WIDE
OP OF
PORTIO
OF THEESC
RIS
R TO HAVE
A VD
T MH-1
UPPER C
NE. CO
TRACT
R
385
DAM EL
=384'
INSTALLING
HE MH-
FRAME
& COVER.
SWM F
CILITY NEW
RISER
RIM
WETLAND
ELEV.
381.75'.
CONTRA
OR SHALL
PLU
, WATER
IGHT, THE
ESC
RIFICE 8.
CELL
.",.,.
INSTAL
ONE NE
06" L
W-FLOW
ORIFICE(INV.=
0.00) WITH
A T
ASHRACIC
,
—PROPOSED
10'
380
XISTING
GRADE
$
WIDE
TOP OF
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380
DAM E
EV.=3$
�-
-
t
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a
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-
-
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12"_SLU
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VALVE--
----
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- -
',
TO SERVE
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VAL
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IN THE
375
f '
fl
SHUTO
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VALVE
375
I
? _ =
HANDLE:
TO BE LOCATED
AT THE RISEWS
RIM
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'
OR JUST
BELC
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BE
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LOCAT
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-
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376.00
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H THE
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ONTRA
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MH
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INV IN: 364.00 TO 10
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NOTE:
TO RED
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LOATAT
360
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360
& BAR
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345
340
RIPRAP
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ESIGN R
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2. CON T
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H IN TA
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-- -
- ---
-
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GROU
D A MIN
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" AT ITS
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THE
ENTIRE P
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3. PLACEMENT
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335
PREP
RATION.
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A
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335
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RIPRAP
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SO THAT ITPRODUCIS
A DENSE
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MASS
OF STONE:
WITH MI
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IDS. THE
zINISHED
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ALL BE FREE
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330
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LAYMEN
THAT IE
KEYED
INTO THE
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A MINIMUM
OF 9'
ALONG
ITS ENT
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320
320
315
315
312
312
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TYPICAL HOMOCEINEOUS
EMBANKMENT
Rpe and .
oo
arauz
ledor Foundatkm drah
FOUKE)ATION DRAIN
CHIMNEY DRAIN
I-�Irial�ou� �116
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1 cif yt,.
or growl
Pe drain
Tfvna'Itian iiilfar
TOE DRAIN
Figure A- Lt., Homoyemll ous Embanktr€enis my ,seepage Floor rots
GENERAL SWM NOTES:
2. STATE APPROVED TRASH RACKS AND ORIFICES SHALL BE
INSTALLED ON ALL ORIFICE OPENINGS. SEE DETAILS ON THIS
SHEET, OR EQUIVALENT.
2. CONCRETE FOUNDATIONS SHALL BE INSTALLED ON ALL
RISER STRUCTURES MEETING MINIMUM VESCH 3.24
SPECIFICATIONS.
3. CONTRACTOR SHALL HIRE A THIRD PARTY GEOTECHNICAL
ENGINEER TO ENSURE THE EMBANKMENTS ARE
STRUCTURALLY SOUND. THE EMBANKMENTS SHALL HAVE A
COMPACTED CLAY CORE WITH A CUTOFF TRENCH & BE IN
ACCORDANCE WITH THE DETAILS SHOWN ON THIS PLAN.
4. THE DOWNSTREAM EMBANKMENT SIDE SLOPES OF ALL
PERMANENT FACILITIES SHALL HAVE A MAXIMUM 3:2 SLOPE.
(
WET POND DESIGN & REQUIREMENTS:
Treatment Volume, Tv (VRRM)
14,716 cf
Minimum Treatment Volume Required for Level 11 Basin
22,074 cf
Treatment Volume Provided at MWSE
13,139 cf
Minimum Percentage of Tv Provided at MWSE
50 %
Percentage of Tv Provided at MWSE
60 %
Ponding Depth Corresponding to Minimum Tv Required
0.8 ft
Maximum Ponding Depth allowed for Minimum Tv
4 ft
Maximum Percentage of Tv Provided above MWSE
50 %
Percentage of Tv Provided above MWSE
40 %
Forebay Volume Required (0.25"/Imp. Ac.) 3,451 cf
Forebay Volume Provided 6,348 cf
Minimum Wetland Shelf Area (10% of Pond Area) 831 sf
Upper Wetland Shelf Area Provided 878 sf
PROPOSED 100' WIDE VDOT CL. Al,
EC-1 RIPRAP LINED EMERGENCY
SPILLWAY CREST ELEVATION= 382.75'.
385 SPILLWAY TO HAVE 4:1 SIDE SLOPES 385
380
380
PROP03
D
GRAD
EXISTING
-
----^
-
- -�--
--
GRADE
375
375
> �
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N s—
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O
00
00
00
00 00
00
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COMMON NAME SZE I SWM FACILITY
QUANTITY COVER
ZONE 1 PLANTINGS
PC PONTEDERIA PECTINATUS POND WEED - - 600
VA VALISNERIAAMERICANA WILD CELERY - - 925
EC ELODEA CANADENSIS WATERWEED - - 1,300
E (sf)
' TI 07 %
SCOTT COLLINS�Z
No. 35791 4
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DR Y DETEN77ON CELL & UNDERGROUND DETENTION SYSTEM DETAIL: SCALE 1 �--30'
:120" WEIR PLATE ®EVIL
NOTE; SCALE:3."®5,
WEIR PLATE TO BE BOLTED & SEALED
TO DETENTION SYSTEM WALLS WITH 7aG• I
WATERTIGHT CONNECTIONS.
ELEV.a.388.oe'
OVERFLOW WEIR LS HYDRAULICALLY (TOP OF PIPE)
EQUIVALENT TO AN ORIFICE WITH AN
APPROX. DIAMETER OF $ 042-2" ELEV: 3B6.25'
MANUFACTURE / INSTALL SIX (6) 05"
MID -FLOW ORIFICE$ IN THE STEEL
PLATE (INVENT ELEVATION 385.15')
INSTALL TRASH RACKS ON ALL
ORIFICES, TYP. SEE SHEET g FOR
DETAIL, OR EQUIVALENT.
REINFORCED GA.
ATE
L T
STEELPLATE
MANUFACTURE / INSTALL ONE (a) 04
LOW -FLOW ORIFICE IN THE STEEL PLATE
ELLEV: 37LJ.®o'
AT THE LOW POINT OF THE DETENTION
(BOTTOM OF PIP
SYSTEM (INVERT ELEVATION 376.00')
FACILITY PLANTING SPECIFICATIONS:
1. THE DETENTION BASIN SHALL HAVE TURF GROUND COVER, SUCH AS GRASS, MULCH OR SOME OTHER FORM OF A VEGETATIVE GROUNDCOVER. LANDSCAPING BEYOND THIS IS OPTIONALAND IS NOT REQUIRED.
2. THE PROPOSED SIDE SLOPES OF THE BASIN SHALL BE A MAXIMUM OF 4:1 TO REDUCE THE RISK OF EROSION. THE PROPOSED FLOOR SLOPES SHALL BE GRADED TO PROVIDE POSITIVE DRAINAGE AT ALLTIMES TO THE
RISER STRUCTURE.
3. WOODY VEGETATION SHALL NOT BE PLANTED OR ALLOWED TO GROW WITHIN 15 FEET OF THE TOE OF THE EMBANKMENT NOR WITHIN 25 FEET OF THE PRINCIPAL SPILLWAY STRUCTURE.
4. A VEGETATED BUFFER SHALL BE PROVIDED THAT EXTENDS AT LEAST 20 FEET OUTWARD FROM THE BASIN TOP OF DAM ELEVATION. PERMANENT STRUCTURES (E.G., BUILDINGS, SHEDS, etc.) SHOULD NOT BE
CONSTRUCTED WITHIN THE BUFFER AREA, EXISTING, TREES SHALL BE PRESERVED IN THE BUFFER AREA DURING CONSTRUCTION IF AT ALL POSSIBLE.
5. THE SOILS IN THE STORMWATER BUFFER AREA ARE OFTEN SEVERELY COMPACTED DURING THE CONSTRUCTION PROCESS, TO ENSURE STABILITY THE DENSITY OF THESE COMPACTED SOILS CAN BE SO GREATTHAT IT
EFFECTIVELY PREVENTS ROOT PENETRATION AND, THEREFORE, MAY LEAD TO PREMATURE MORTALITY OR LOSS OF VIGOR. AS A RULE OF THUMB, PLANTING HOLES SHOULD BE THREE TIMES DEEPER AND WIDER THAN
THE DIAMETER OF THE ROOTBALL FOR BALL -AND -BURLAP STOCK, AND FIVE TIMES DEEPER AND WIDER FOR CONTAINER -BROWN STOCK.
& AVOID SPECIES THAT REQUIRE FULL SHADE, OR ARE PRONE TO WIND DAMAGE. EXTRA MULCHING AROUND THE BASE OF TREES AND SHRUBS IS STRONGLY RECOMMENDED AS A MEANS OF CONSERVING MOISTURE AND
SUPPRESSING WEEDS.
CONTBACTOR TS:
1. THE CONTRACTOR SHALL BE RESPONSIBLE FOR LAYOUT OF ALL WORK COVERED UNDER THESE PLANS,
2. LANDSCAPE CONTRACTOR SHALL REFER TO THE STANDARDIZED LANDSCAPE SPECIFICATIONS FOR THE STATE OF VIRGINIA FOR ADDITIONAL INFORMATION. THE CONTRACTOR SHALL ABIDE BY ITS CONTENTS; HOWEVER
ANY NOTES OR SPECIFICATIONS ON THE PLANS SHALL SUPERSEDE THOSE OUTLINED IN THE SPECIFICATIONS MANUAL (COPIES ARE AVAILABLE FOR A FEE FROM THE VIRGINIA CHAPTER OF THE AMERICAN SOCIETY OF
LANDSCAPE ARCHITECTS, VIRGINIA NURSERYMEN'S ASSOCIATION, INC. AND THE VIRGINIA SOCIETY OF LANDSCAPE DESIGNERS).
3. ALL PLANT MATERIAL SHALL MEET THE MINIMUM SPECIFICATIONS AND STANDARDS DESCRIBED IN THE CURRENT ISSUE OF THE AMERICAN STANDARD FOR NURSERY STOCK, PUBLISHED BY THE AMERICAN ASSOCIATION
OF NURSERYMEN,1250 STREET, NW, SUITE 500, WASHINGTON, DC 20005.
4. THE CONTRACTOR SHALL VERIFY ALL DIMENSIONS IN THE FIELD AND NOTIFY THE DESIGNER OF ANY VARIANCE FROM THE PLAN.
S. THE LANDSCAPE CONTRACTOR IS RESPONSIBLE FOR VERIFYING THE LOCATION OF ANY ONSITE UTILITIES (CALL MISS UTILITY 1-800-552-7001. BEFORE ANY EXCAVATION).
6. REFER TO THE APPROVED FINAL SITE PLANS FOR ANY DETAILED SITE INFORMATION.
7. ALL WORK SHALL BE COORDINATED WITH OTHER PARTIES.
B. PLANTS WILL BE PREPARED FOR SHIPMENT IN A MANNER THAT WILL NOT CAUSE DAMAGE TO THE BARK, BUDS, BRANCHES, STEMS, OR OVERALL SHAPE OF THE STOCK. CONTAINER GROWN PLANTS WILL BE
TRANSPORTED IN THE CONTAINERS IN WHICH THEY HAVE GROWN.
9. ALL PLANT MATERIAL, UNLESS OTHERWISE SPECIFIED, SHALL BE UNIFORMLY BRANCHED AND HAVE A VIGOROUS ROOT SYSTEM. PLANT MATERIAL SHALL BE HEALTHY, VIGOROUS, AND FREE FROM DEFECTS, DECAY,
DISEASES, INSECT PEST EGGS, AND ALL FORMS OF INFESTATION. ALL PLANT MATERIAL SHALL BE FRESH, FREE FROM TRANSPLANT SHOCK OR VISIBLE WILT. PLANTS DEEMED UNHEALTHY WILL BE REJECTED.
10. ALL CONTAINER STOCK SHALL HAVE BEEN PROPAGATED IN A CONTAINER LONG ENOUGH FOR THE ROOT SYSTEM TO HAVE DEVELOPED SUFFICIENTLYTO HOLD ITS SOIL. CONTAINER STOCK WITH POORLY DEVELOPED
ROOT SYSTEMS WILL NOT BE ACCEPTED.
11. PLANTS NOT INSTALLED ON THE DAY OF ARRIVAL ON SITE SHALL BE STORED AND PROTECTED BY THE CONTAINER. OUTSIDE STORAGE AREAS WILL BE SHADED AND PROTECTED FROM THE WIND AND SUN. PLANTS
STORED ON SITE SHALL BE PROTECTED FROM ANY DRYING AT ALL TIMES BY COVERING THE BALD OR ROOTS WITH MOIST SAWDUST, WET BURLAP, WOOD CHIPS, SHREDDED BARK, PEAT MOSS, OR OTHER SIMILAR
MULCHING MATERIAL.
12. THE OWNER RESERVES THE RIGHT TO SUBSTITUTE PLANT MATERIAL TYPE, SIZE AND/OR QUANTITY. ANY SUBSTITUTIONS MUST BE APPROVED BY THE INSPECTOR INITIALLY, AND THEN THE DESIGNER.
13. MINOR FIELD ADJUSTMENTS MAY BE NECESSARY DUE TO SITE CONDITIONS (EX: ROOTBALL AND UTILITY CONFLICT). MAJOR ADJUSTMENTS MUST BE APPROVED BY THE DESIGNER.
14. NO PLANTING SHALL OCCUR WHEN THE SOIL IS FROZEN.
15. PLANT MATERIAL SHALL BE PLACED IN EXISTING SOIL WITH EACH PLANTING PIT EXCAVATED TO A SIZE SUFFICIENT TO CONTAIN THE ENTIRE ROOT BALL OR ROOT MASS, WITHOUT CRAMPING ROOTSTOCK.
16. THE CONTRACTOR SHALL MAINTAIN A ONE (1) CALENDAR YEAR 90% CARE AND REPLACEMENT WARRANTY FOR ALL PLANTINGS. 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.
17. THE CONTRACTOR IS RESPONSIBLE FOR REMOVALAND DISPOSAL OF TRASH AND DEBRIS WITHIN THE LIMITS OF THE PLANTING ON A DAILY BASIS.
18. THE CONTRACTOR WILL NOT BE RESPONSIBLE FOR PLANT MATERIAL THAT HAS BEEN DAMAGED BY VANDALISM, FIRE, OR OTHER ACTIVITIES BEYOND THE CONTRACTOR's CONTROL,
FACILITY CONS'TT'RU d ON
1. THE DETENTION BASIN MAY SERVE AS A SEDIMENT BASIN AND/OR TRAP DURING PROJECT CONSTRUCTION. IF THIS IS DONE, THE VOLUME SHALL BE BASED ON THE MORE STRINGENT SIZING RULE (EROSION AND
SEDIMENT CONTROL REQUIREMENTS VS. STORMWATER TREATMENT REQUIREMENTS). INSTALLATION OF THE PERMANENT RISER SHALL BE INITIATED DURING THE CONSTRUCTION PHASE, AND DESIGN ELEVATIONS
SHALL BE SET WITH FINAL CLEANOUT OF THE SEDIMENT BASIN AND CONVERSION TO THE POST -CONSTRUCTION POND IN MIND. APPROPRIATE PROCEDURES SHALL BE IMPLEMENTED TO PREVENT DISCHARGE OF
TURBULENT' WATERS WHEN THE BASIN IS BEING CONVERTED INTO AN DETENTION BASIN. FOR THIS DESIGN IN PARTICULAR, THE RISER, RISER FOUNDATION, BARRELAND LOW -FLOW ORIFICE SHALL BE INSTALLED ATTHE
TIME OF THE SEDIMENTTRAP's CONSTRUCTION AND SHALL REMAIN WATERTIGHT UNTILTHE TRAP IS CONVERTED TO A PERMANENT FACILITY.
2. THE DETENTION BASIN SHALL ONLY BE CONSTRUCTED AFTER THE CONTRIBUTING DRAINAGE AREA TO THE POND IS COMPLETELY STABILIZED. IF THE PROPOSED POND SITE WILL BE USED AS A SEDIMENTTRAP OR BASIN
DURING THE CONSTRUCTION PHASE, THEN THE FACILITY WILL BE DEWATERED, DREDGED AND RE -GRADED TO DESIGN DIMENSIONS AFTER THE ORIGINAL SITE CONSTRUCTION IS COMPLETE,
3. INSTALL E&S CONTROLS PRIOR TO CONSTRUCTION OF THE BASIN, INCLUDING TEMPORARY DE -WATERING DEVICES AND STORMWATER DIVERSION PRACTICES. ALLAREAS SURROUNDING THE BASIN THAT ARE GRADED
OR DENUDED DURING CONSTRUCTION SHALL BE PLANTED WITH TURF GRASS, NATIVE PLANTINGS, OR OTHER APPROVED METHODS OF SOIL STABILIZATION.
4. CONTRACTOR SHALL EXCAVATE THE CORE TRENCH AND INSTALL THE SPILLWAY PIPE DURING THE ESC PHASE,
5. CONTRACTOR SHALLALSO INSTALLTHE RISER, OUTFLOW STRUCTURE AND/011 THE BARREL(s) DURING THE ESC PHASE TO ENSURE THE TOP INVERT OF THE OVERFLOW WEIR IS CONSTRUCTED LEVEL ATTHE DESIGN
ELEVATION.
6. THE CONTRACTOR SHALLTHEN CONSTRUCT THE EMBANKMENT, AND ANY INTERNAL BERMS IF APPLICABLE, IN B TO 12-INCH LIFTS AND COMPACTTHE LIFTS WITH APPROPRIATE EQUIPMENT.
7. UPON COMPLETION OF THE EMBANKMENT GRADING, THE CONTRACTOR SHALL EXCAVATE/GRADE UNTIL THE APPROPRIATE ELEVATION AND DESIRED CONTOURS ARE ACHIEVED FOR THE BOTTOM AND SIDE SLOPES OF
THE BASIN.
R. CONTRACTOR SHALLTHEN CONSTRUCTTHE EMERGENCY SPILLWAY IN CUT OR STRUCTURALLY STABILIZED SOILS.
9. THE CONTRACTOR SHALL THEN FINISH CONSTRUCTION OF ALL OUTLET STRUCTURES, INCLUDING DOWNSTREAM RIP -RAP APRON PROTECTION.
10, THE CONTRACTOR SHALL NEXT STABILIZE EXPOSED SOILS BY HYDROSEEDING OR SEEDING OVER STRAW.
11. THE CONTRACTOR SHALLTHEN INSTALLTHE APPROPRIATE BASIN LANDSCAPING IN ACCORDANCE WITH THE APPROVED PLANS.
FACILITY a " TENANCE:
MAINTENANCE OF THE DETENTION BASIN IS DRIVEN BY ANNUAL INSPECTIONS THAT EVALUATE THE CONDITION AND PERFORMANCE OF THE FACILITIES. DURING THESE INSPECTIONS THE FOLLOWING TASKS SHALL BE
PERFORMED BYTHE CONTRACTOR IN THE FIRSTYEAR FOLLOWING INSTALLATION, AND THE OWNER THEREAFTER:
1. MEASURE SEDIMENT ACCUMULATION LEVELS IN THE BASIN.
2. MONITOR THE GROWTH OF THE GROUNDCOVER AND ANY TREES AND SHRUBS PLANTED, AS APPLICABLE. RECORD THE SPECIES AND THEIR APPROXIMATE COVERAGE, AND NOTE THE PRESENCE OF ANY INVASIVE PLANT
SPECIES, AS APPLICABLE.
3. INSPEC'TTHE CONDITION OF STORMWATER INLETS TO THE BASIN FOR MATERIAL DAMAGE, EROSION OR UNDERCUTTING.
4. INSPECT THE BANKS OF UPSTREAM AND DOWNSTREAM CHANNELS FOR EVIDENCE OF SLOUGHING, ANIMAL BURROWS, BOGGY AREAS, WOODY GROWTH, OR GULLY EROSION THAT MAY UNDERMINE EMBANKMENT
INTEGRITY.
5. INSPECT BASIN OUTFALL CHANNEL FOR EROSION, UNDERCUTTING, RIP -RAP DISPLACEMENT, WOODY GROWTH, etc.
6. INSPECT CONDITION OF PRINCIPAL SPILLWAY AND RISER FOR EVIDENCE OF SPALLING, JOINT FAILURE, LEAKAGE, CORROSION OR OTHER FAILURES.
7. INSPECT CONDITION OF ALL TRASH RACKS, REVERSE SLOPED PIPES OR FLASHBOARD RISERS FOR EVIDENCE OF CLOGGING, LEAKAGE, DEBRIS ACCUMULATION OR OTHER FAILURES.
B. INSPECT MAINTENANCE ACCESS TO ENSURE IT IS FREE OF WOODY VEGETATION, AND CHECK TO SEE WHETHER VALVES, MANHOLES AND LOCKS CAN BE OPENED AND OPERATED.
9. INSPECT INTERNAL AND EXTERNAL SIDE SLOPES OF THE BASIN FOR EVIDENCE OF SPARSE VEGETATIVE COVER, EROSION, OR SLUMPING.
10. OWNER OR CONTRACTOR SHALL MAKE NEEDED REPAIRS IMMEDIATELY.
FACILITY INSPECTION:
MULTIPLE INSPECTIONS ARE CRITICAL TO ENSURE THE BASIN(s) ARE PROPERLY CONSTRUCTED. BECAUSE THE TIMING OF THE INSTALLATION IS DICTATED BY THE CONTRACTOR, THE CONTRACTOR SHALL BE RESPONSIBLE FOR
CONTACTING THE ENGINEER AND INSPECTOR PRIOR TO INSTALLATION, MULTIPLE SITE VISITS AND INSPECTIONS ARE REQUIRED TO BE SCHEDULED BY THE CONTRACTOR WITH THE ENGINEER AND INSPECTOR DURING THE
FOLLOWING STAGES OF THE DETENTION BASIN's CONSTRUCTION PROCESS:
1. PRE -CONSTRUCTION MEETING
2. INITIAL SITE PREPARATION (INCLUDING INSTALLATION OF PROJECT ELISS CONTROLS)
3. EXCAVATION/GRADING (e.g., INTERIM/FINAL ELEVATIONS)
4. EXTENDED DETENTION BASIN INSTALLATION (e.g., INTERIM AND FINAL ELEVATIONS)
S. INSTALLATION OF THE EMBANKMENT, THE RISER/PRIMARY SPILLWAY, AND THE OUTLET STRUCTURE($),
6. PLANTING PHASE (WITH AN EXPERIENCED LANDSCAPE ARCHITECT PRESENT/DIRECTING)
7. FINAL INSPECTION (DEVELOP A PUNCH LIST FOR FACILITY ACCEPTANCE)
375
375
DRY DE
NTION
ELL RISER
FOUN
ATION NOTE:
TO RED
CE THE
ISK OF
LOATA
ON, RIS
R BASE
BARRE
CONNE
ION SHALL
BE FI.
MLY EN
BEDDED
6" INTO
N 18"
- -
THICK R
INF�RC
E-D CON
RCTE FO
N�ATIO
THAT I
8'XB'y-
BUW
UTSIDE
THE LIM
TS OF
E E3SCA
ATiON.
37�
370
MH-1
TTH A RIM
ELEVATION
OF
357.33'
A I
RASHRA
K SHALL.
BE INSTALLED
OVER
THE
E's- PE
R 24"
PENIS
INS
EAD OF
MH-1
ME
OVER.
RIS
R TO INCLUDE
A
03" LOW
-FLOW
365
OF
IFICE WITH
AN IP
VERT_3
2.00'
365
XISTINC.
-PROPOE
ED 10' WIDE
TOP
PROPOSED
GRADE
OF Di
M ELEV,
360'.
GRAD
360
360
355
355
a
BASIN
001YOM
SHALL
HAVE POSITIVE
SLOPE
TO
THE RIS
R IN AL
PLACE
F S
S
350
PROPOSED
12" HD
E DRY
35�
DETENTION
CEL
BARRELw/
VDOT
STD.
W-1. (G
,00' @ 0
5%, INV
IN=3
0.00', INV.
OUT=349.68')
PROPOSED
VDOT
STD.
CL. Al
RIPR,kP
WITH
FILTER F
BRIC
Ufa
DERLAY
ENT (L-
7',
345
wl
=31, W2
11.8', D
2')
345
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SECTION
PROPOSED 1
' WIDE TOP
OF DAM ELEV.=360'.
365 1 365
-CONTRACTOR SHALL
INSTALL A COMPACTED
CLAY GORE w/ A
CUTOFF TRENCH.
EMBANKMENT TO BE IN
ACCORDANCE w/ THE
DESIGN SHOWN ON
THESE PLANS.
p�
PROPOSED 50' WIDE VDOT CL.
Al, EC-1 RIPRAP LINED
EMERGENCY SPILLWAY CREST 355
ELEVATION® 358.66'. SPILLWAY
TO HAVE 4:1 SIDE SLOPES
mm
ME
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TEMPORARY COVER FOR
CONSTRUCTION LOADS
FINISHED
HEIGHT OF GRADE
COVER
CONSTRUCTION LOADS
FOR TEMPORARY CONSTRUCTION VEHICLE. LOADS, AN EXTRA AMOUNT OF COMPACTED COVER MAY BE REQUIRED OVER
THE TOP OF THE PIPE. THE HEIGHT -OF -COVER SHALL MEET THE MINIMUM REQUIREMENTS SHOWN IN THE TABLE BELOW,
THE USE OF HEAVY CONSTRUCTION EQUIPMENT NECESSITATES GREATER PROTECTION FOR THE PIPE THAN FINISHED
GRADE COVER MINIMUMS FOR NORMAL HIGHWAY TRAFFIC.
PIPE SPAN,
INCHES
AXLE LOADS(
kips)
18--50
50-75 7,5-110
MINIMUM COVER (FT)
2.0
2.5
3.0
3.0
12-42
48-72
3.0
3.0
3.5
4.0
78-120
10
3,6
4,0
4,0
126-144
3 4
1 4.0
46
4.5 1
-MINIMUM COVER MAY VARY, DEPENDING ON LOCAL CONDITIONS. THE CONTRACTOR MUST PROVIDE THE ADDITIONAL
COVER REQUIRED TO AVOID DAMAGE TO THE PIPE. MINIMUM COVER IS MEASURED FRO M THE TOP OF THE PIPE TO
THE TOP OF THE MAINTAINED CONSTRUCTION ROADWAY SURFACE.
CONSTRUCTION LOADING DIAGRAM
NOT TO SCALE
SPECIFICATION FOR CORRUGATED STEEL PIPE SJEEL
-ALUMINIZED TYPE_
SCOPE HANDLING AND ASSEMBLY
THIS SPECIFICATION COVERS THE MANUFACTURE AND SHALL BE IN ACCORDANCE WITH RECOMMENDATIONS OF THE
INSTALLATION OF THE CORRUGATED STEEL PIPE (CSP) DETAILED IN NATIONAL CORRUGATED STEEL PIPE ASSOCIATION (NCSPA)
THE PROJECT PLANS.
INSIALLATIQ N
MATERIAL
SHALL BE IN ACCORDANCE WITH AASHTO STANDARD
THE ALUMINIZED TYPE 2 STEEL COILS SHALL CONFORM TO THE SPECIFICATIONS FOR HIGHWAY BRIDGE$, SECTION 20, DIV00N I
APPLICABLE REQUIREMENTS OF AASHTO M274 OR ASTM A929. OR ASTM A798 AND IN CONFORMANCE WITH THE PROJECT PLANE,
AND SPECIFICATIONS. IF THERE ARE ANY INCONSISTENCIES OR
PIPE CONFLICTS THE CONTRACTOR SHOULD DISCUSS AND RESOLVE
WITH THE SITE ENGINEER-
TH CSP SHALL BE MANUFACTURED IN ACCORDANCE WITH THE
APPLICABLE REQUIREMENTS OF AASHTO M36 OR ASTM A760. THE IT IS ALWAYS THE RESPONSIBILITY OF THE CONTRACTOR TO
KES, GAGES AND CORRUGATIONS SHALL BE AS SHOWN ON FOLLOW OSHA GUIDELINES FORSAFE PRACTICES,
PIPE 817
THE PROJECT PLANS.
ALL FABRICATION OF THE PRODUCT SHALL OCCUR WITHIN THE
UNITED STATES.
z
W
W
W
CL
FOUNDATION 2
MATERIAL SPECIFICATION
NOT TO SCALE
A
30"0 MAX., HS-25 ACCESS CASTING
WITH GRADE RINGS AS REQUIRED, TO
BE PROVIDED AND INSTALLED BY
CONTRACTOR. MAY BE TOP MOUNTED
CMP RECESSED.
(AS SHOWN) OR 0�
PREC OTTION W
\ SLAB RIM/FINISHED >
- - - - - - - -
GRADE VARIES
4 c
co i5_
L 4
4 4.
_j
GASKET MATERIAL 0 CMP RISER
T
j SUFFICIENT TO PREVENT 0
SLAB FROM BEARING ON Lu
RISER TO BE PROVIDED BY 0
CONTRACTOR. OB L.L Y)
SECTION VIEW
I�S CkS 11�4:G:�:46_T SUFPL CEb BY tU TE C-H
"BEARING
0 CmP
A
10
REINFORCING
PRESSURE
RISER
(PSF)
24"
4'0
26"
#5 @ 10- OCEW
2,540
#5 @ la, OCEW
1,900
41-6110
#6 @ 10- OCEW
2,260
4'-6" x T-6"
#5 T OCEW
1,670
-
361,
610
3IJ45
#5 9- OCEW
2,060
5' x 6'
8- OCEW
1,500
42"
[5�-611
44V
05 8- OCEW
1,490
x 6-13511
#5 8- OCEW
1,370
48"
V0
50"
oircicEw
1,210
6' x 6'
05 r OCEW
1,270
A A
#4 DIAGONAL TRIM
#4 DIAGONAL TRIM BAR (TYP. 4 PLACES), T
BAR (TYP, 4 PLACES), f SEE NOTE 7�
SEE MOTE T -- - - -- 4 %v - - - - Tf - - - - - -
- - - - - - - - -
- - - - - - z: L Z TI-7 1
2" COVER
(TYP)
I I
1.1- - - - - - LL
/111 1
011- i 10_
CIO
>
7'
I( )I
11 If I
OPENING IN
OPENING IN PROTECTION _z.
A
PROTECTION v
SLAB FOR
SLAB FOR AGESS I I I
ACCF-88 I I 1- -1 r 11
I I I I I
L A
INTERRUPTED BAR I I t I/ I
REPLACEMENT, SEE -- I I I �� //I I I FI
NOTE 6.
3TANDARD STANDARD
REINFORCING, REINFORCING, 00
SEE TABLE SEE TABLE
ROUND OPTION PLAN VIEW
NOTES:
1. DESIGN IN ACCORDANCE WITH AASHTO, 171h
EDITION AND ACI 350.
2. DESIGN LOAD H325.
3. EARTH COVER = VMAX.
4. CONCRETE STRENGTH = 4,000 psi
5- REINFORCING STEEL = ASTM A61 5, GRADE 60.
6, PROVIDE ADDITIONAL REINFORCING AROUND
OPENING$ EQUAL TO THE BARS INTERRUPTED
HALF EACH SIDE. ADDITIONAL BARS TO BE IN THE
SAME PLANK.
MIN.
OR
DIAMETER
COVER
PROFILE
W-19-1
12"
1 1,12" x 1/4'
IZ'48"
12"
I
2 2/3" x -1/2"
f
54"-96"
12"
rx x
102'-144"
D/8
3" x I", V'x I"
BACKFILL REQUIREMENTS FOLLOW TINE GUIDELINES OF AA81470 LRFD BRIDGE DESIG IN (SEC 12) AND CONSTRUCT)ION (SFC 26)
I MINIMUM TRENCH WIDTH MUST ALLOW ROOM FOR PROPER COMPACTION OF HAUNCH
MATERIALS UNDER THE PIPE.
THE MINIMUM TRENCH WITH (12.6.6.1);
PIPE!5 12", D + 16"
PIPE > 12": 1.5D + 12"
la MINIMUM EMBANKMENT WIDTH (IN FEET) FOR INITIAL FILL ENVELOPE (12.6.6.2):
PIPE < 2411:3.OD
PIPE 24" - 144"; D + TW
PIPE > 144": D + 10'0'
2 THE FOUNDATION UNDER THE PIPE AND SIDE BACKFILL. SHALL BE ADEQUATE TO SUPPORT THE LOADS ACTING UPON IT
3 BEDDING MATERIAL SHALL BE A RELATIVELY LOOSE MATERIAL THAT IS ROUGHLY SHAPED TO FIT THE BOTTOM OF THE PIPE, AND A
MINIMUM OF TWICE THE CORRUGATION DEPTH IN THICKNESS, WITH THE MAXIMUM PARTICLE SIZE OF ONE-HALF OF THE CORRUGATION
DEPTH 26.5.3).
4 CORRUGATED STEEL PIPE (CUSP I HEL-COR).
5 HAUNCH ZONE MATERIAL SHALL BE HAND SHOVELED OR SHOVEL SLICED INTO PLACE TO ALLOW FOR PROPER COMPACTION (26.6.4).
5a INITIAL BACKFILL FOR PIPE EMBEDMENT TO MEET AASHTO, A-1, A-2 OR A-3 CLASSIFICATION, OR APPROVED EQUAL, COMPACTED TO 90%
STANDARD PROCTOR (T 99). MAXIMUM PARTICLE SIZE NOT TO EXCEED 3- (12A.1.2). ALL LIFTS PLACED IN A CONTROLLED MANNER. IT IS
RECOMMENDED THAT LIFTS NOT EXCEED AN W'UNCOMPACTED LIFT HEIGHT TO PREVENT UNEVEN LOADING, AND THE LESSER OF 1/3
THE DIAMETER OR 24" AS THE MAXIMUM DIFFERENTIAL SIDE -TO -SIDE (26.5.4).
6 INITIAL BACKFILL ABOVE PIPE MAY INCLUDE ROAD BASE MATERIAL (AND RIGID PAVEMENT IF APPLICABLE). SEE TABLE ABOVE.
6a TOTAL HEIGHT OF COMPACTED COVER FOR CONVENTIONAL HIGHWAY LOADS IS MEASURED FROM TOP OF PIPE TO BOTTOM OF
FLEXIBLE PAVEMENT OR TOP OF RIGID PAVEMENT (12.6.6.3).
7 FINAL BACKFILL MATERIAL SELECTION AND COMPACTION REQUIREMENTS SHALL FOLLOW THE PROJECT PLANS AND SPECIFICATIONS
PER THE ENGINEER OF RECORD (26.5A. 1),
NOTES:
• GEOTEX TILE SHOULD BE CONSIDERED FOR USE TO PREVENT SOIL MIGRATION INTO VARYING SOIL TYPES (PROJECT ENGINEER).
• FOR MULTIPLE BARREL INSTALLATIONS THE RECOMMENDED STANDARD SPACING BETWEEN PARALLEL PIPE RUNS SHALL BE PIPE DIA./2
BUT NO LESS THAN 12', OR W'FOR PIPE DIAMETERS 72" AND LARGER.
• CONTACT YOUR CONTECH REPRESENTATIVE FOR NONSTANDARD SPACING (TABLE C12.6.7-1).
TYPICAL BACKFILL DETAIL
NOT TO SCALE
20 MIL PE
IMPERMEABLE
LINER OVER
TOP OF PIPE
(IF REQUIRED)
INTERRUPTED BAR
REPLACEMENT,
SEE NOTE 6,
SQUARE OPTION PLAN VIEW
7. TRIM OPENING WITH DIAGONAL #4 BARS, EXTEND BARS A
MINIMUM OF 12" BEYOND OPENING, BEND BARS AS REQUIRED
TO MAINTAIN BAR COVER.
8. PROTECTION SLAB AND ALL MATERIALS TO BE PROVIDED AND
INSTALLED BY CONTRACTOR.
9. DEETAIL DESIGN BY DELTA ENGINEERS, ARCHITECTS AND LAND
,,URVEYORS, ENDWELL, NY.
LIMITS OF
REQUIRED
BACKFILL
436" SEE TYPICAL
CKFILL DETAIL
NOTES
NOTE; IF SALTING AGENTS FOR SNOW AND ICE REMOVAL ARE USED ON OR NEAR THE
PROJECT, A GEOMEMBRANE BARRIER IS RECOMMENDED WITH THE SYSTEM, THE
GEOMEMBRANE LINER IS INTENDED TO HELP PROTECT THE SYSTEM FROM THE
POTENTIAL ADVERSE EFFECTS THAT MAY RESULT FROM A CHANGE IN THE
SURROUNDING ENVIRONMENT OVER A PERIOD OF TIME. PLEASE REFER TO THE
CORRUGATED METAL PIPE DETENTION DESIGN GUIDE FOR ADDITIONAL INFORMATION.
HUGGER
BAND FLAT GASKET
SINGLE BAR,
BOLT AND STRAP (SBBS)
FLAT GASKET
GENERAL NOTES:
1. JOINT IS TO BE ASSEMBLED PER AASHTO BRIDGE CONSTRUCTION SPECIFICATION SEC 26.4.2.4.
2. BAND MATERIALS ANDIOR COATING CAN VARY BY LOCATION. CONTACT YOUR CONTECH REPRESENTATIVE FOR AVAILABILITY.
3. BANDS ARE SHAPED TO MATCH THE PIPE -ARCH WHEN APPLICABLE.
4. BANDS ARE NORMALLY FURNISHED AS FOLLOWS:
0 12" THRU 48" 1 -PIECE
® 54"THRU 96" 2-PIECES
0 102"THRU 144" 3-PIECES
S. BAND FASTENERS ARE ATTACHED WITH SPOT WELDS, RIVETS OR HAND WELDS.
6. ALL OMP 13 REROLLED TO HAVE ANNULAR END CORRUGATIONS OF 2 2/3"x1/2"
7. DIMENSIONS ARE SUBJECT TO MANUFACTURING TOLERANCES.
8- ORDER SHALL DESIGNATE GASKET OPTION, IF REQUIRED (SEE DETAILS ABOVE).
H-12 HUGGER BAND DETAIL
NOT TO SCALE
I/?" 7i pla I iLd nuok
L',A' RDPE w6W (opLionat)
pipe
Ina, yw d.qwal
AhQIVn wffll opimW plats
1/1 " Q3 ano 4' plate
b'y
t 1, k;' V L I Ij I I
. PLASTIC
17-1.b 4:"1511�
SOLU11ONS
DEBRIS CAGE
I
SECTION 4: TWICAl DE
UPPER S-AP-LP %,VETLAND tLEVELZ
11,4FLOW FRC-46A FOREPRAY
WE-fLAi4D OP-L MAX TIX DEPTH - 12'
PCIPEDAY IRE PER TO TABLE 14 2 FOR VOLUWE
iflE-FE19TOTIABLE FIE QUIROAENT` l
14,2 FOR VC[LUNE W
"All
LCMI
'YL
MaH
"-�- jr-_
IREFrR TO YABLE, IGM-2
F OR iL I A N 0 L12
AFRA' 110H
k77iCk BENPOF1
1Y BEENCH
PLANVIEVY
IjER
Q1JT1,F.T
FLOW 1"Afln AND POOL GEOME-MY
iFLGFGR TO TA2LF_ m.Q POP L I AND
L2 REOUIr42AFNIS)
- 4a m 18TP?o .E. REFER TO• TAEaLE-: 119.2AT40 DSZAQN�15PEC NO, I c- - -0= "EmANO
a_-�_-MOM S F 0 F3 L I A-M EP Uac \<U_!*A EA14D;aT0,=1AQr_ DEPTH CH WE mA_ IN VSTL_A,N0 GEL.
f-_J'71:J1f LUV r()Arffj W-;N a 60 t''IMAL
P0,3L , �4ArF=_TY @R'4r_-�H
AOLIATP�0 BR40"
AaW FLOW TO, UPPER
AQUIAW-1
OH,�TJNEEL
t40f*AAJ_ P�C�L _\
T_
'N TO "Nffr frJND I 1-11911 FV2
T r Tr,
1111 T I 11Tjj '.' -9
__ I
_1W
a7 i
�: Fl Ir -1 1 0
W111-11i fl ''M i j 11 C_ fff - ff FIFL-z
t,OTE. FiEFER TO 0E0T%,)N 0 Ft,:?R L i A�,Vx L2 1-4Kk9tAt-,L POOLVOLUIvE,
M-JO EEPM,, AND TV A r-HANNEL PRff-FECTION 9TORAOF- ImPT149
PROFILE (WIOUT UPPER SHELF WETLAt-,10a
Figure 14. T. Wcar Poind Oesign Schem-arics
FRONT
48"0 to 90"0 FITTING REINFORCEMENT
MAY BE REQUIRED BASED ON HEIGHT OF
COVER AND LIVE LOAD CONDITION
TYPICAL MANWAY DETAIL
NOT TO SCALE
WET POND CONSTRUCTION NOTES:
FACILITY PLANTING SPECIFICATIONS:
1. THE CONTRACTOR SHALL ESTABLISH AND MAINTAIN A VEGETATIVE COVERAGE IN THE POND AND ITS BUFFER.
2, THE CONTRACTOR SHALL ALSO INSTALL THE WETILAND SHELF AND AQUATIC BENCH PLANTINGS, AS REQUIRED, AND USE NUTRIENT RICH SOIL IN
THESE AREAS TO PROMOTE HEALTHY GROWTH AND ROOT DEVELOPMENT,
3. PLANT SELECTION SHALL PROMOTE DIVERSE WILDLIFE AND WATERFOWL USE WITHIN THE STORMWATER WETLAND, AQUATIC BENCH AND
BUFFERS,
4, WOODY VEGETATION MAY NOT BE PLANTED OR ALLOWED TO GROW WITHIN 15 FEET OF THE TOE OF THE EMBANKMENT NOR WITHIN 2S FEET
FROM THE PRINCIPAL SPILLWAY STRUCTURE.
5. A VEGETATED BUFFER SHALL BE PROVIDED THAT EXTENDS AT LEAST 25 FEET OUTWARD FROM THE MAXIMUM WATER SURFACE ELEVATION OF
THE WET POND. PERMANENT STRUCTURES (E.G., BUILDINGS) SHALL NOT BE CONSTRUCTED WITHIN THE BUFFER AREA, EXISTING TREES SHALL
BE PRESERVED IN THE BUFFER AREA DURING CONSTRUCTION IF POSSIBLE,
6, THE SOILS IN THE STORMANATER BUFFER AREA ARE OFTEN SEVERELY COMPACTED DURING THE CONSTRUCTION PROCESS, TO ENSURE
STABILITY, THE DENSITY OF THESE COMPACTED 501 L5 CAN BE SO GREAT THAT IT EFFECTIVELY PREVENTS ROOT PENETRATION AND, THEREFORE,
MAY LEAD TO PREMATURE MORTAL" OR LOSS OF VIGOR. AS A RULE OF THUMB, PLANTING HOLES SHALL BE THREE TIMES DEEPER AND
WIDER THAN THE DIAMETER OF THE ROOT BALI FOR BALL -AND -BURLAP STOCK, AND FIVE TIMES DEEPER AND WIDER FOR CONTAINER -GROWN
STOCK,
7. AVOID SPECIES THAT REQUIRE FULL SHADE, OR ARE PRONE TO WIND DAMAGE. EXTRA MULCHING AROUND THE BASE OF TREES AND SHRUBS IS
STRO NO LY RECOMMENDED AS A MEANS OF CONSERVING MOISTURE AND SUPPRESSING WEEDS,
CONTRACTOR REQUIREMENTS:
1, THE CONTRACTOR SHALL BE RESPONSIBLE FOR LAYOUT OF ALL WORK COVERED UNDER THESE PLANS,
2. LANDSCAPE CONTRACTOR SHALL REFER TO THE STANDARDIZED LANDSCAPE SPECIFICATIONS FOR THE STATE OF VIRGINIA FOR ADDITIONAL
INFORMATION. THE CONTRACTOR SHALL ABIDE BY ITS CONTENTS; HOWEVER ANY NOTES OR SPECIFICATIONS ON THE PLANS SHALL SUPERSEDE
THOSE OUTLINED IN THE SPECIFICATIONS MANUAL (COPIES ARE AVAILABLE FOR A FEE FROM THE VIRGINIA CHAPTER OF THE AMERICAN
SOCIETY OF LANDSCAPE ARCHITECTS, VIRGINIA NURSERYMEN'S ASSOCIATION, INC. AND THE VIRGINIA SOCIETY OF LANDSCAPE DESIGNERS).
3. ALL PLANT MATERIAL SHALL MEET THE MINIMUM SPECIFICATIONS AND STANDARDS DESCRIBED IN THE CURRENT ISSUE OF THE AMERICAN
STANDARD FOR NURSERY STOCK, PUBLISHED BY THE AMERICAN ASSOCIATION OF NURSERYMEN, 1250 STREET, NW, SUITE 500, WASHINGTON,
DC 20005.
4. THE CONTRACTOR SHALL VERIFY ALL DIMENSIONS IN THE FIELD AND NOTIFY THE DESIGNER OF ANY VARIANCE FROM THE PLAN.
5. THE LANDSCAPE CONTRACTOR IS RESPONSIBLE FOR VERIFYING THE LOCATION OF ANY ONSITE UTILITIES (CALL MISS UTILITY 1-800-552-700
BEFORE ANY EXCAVATION).
& REFER TO THE APPROVED CONSTRUCTION PLANS FOR ANY DETAILED SITE INFORMATION.
7. ALL WORK SHALL BE COORDINATED WITH OTHER PARTIES.
S. PLANTS WILL BE PREPARED FOR SHIPMENT IN A MANNER THAT WILL NOT CAUSE DAMAGE TO THE BARK, BUDS, BRANCHIE%STEMS, OR
OVERALL SHAPE Or THE STOCK. CONTAINER GROWN PLANTS WILL BET NSPORTED IN THE CONTAINERS IN WHICH THEY HAVE BEEN GROWN,
9. ALL PLANT MATERIAL, UNLESS OTHERWISE SPECIFIED, SHALL BE UNIFORMLY BRANCHED AND HAVE A VIGOROUS ROOT SYSTEM. PLANT
MATERIAL SHALL BE HEALTHY, VIGOROUS, AND FREE FROM DEFECTS, DECAY, DISEASES, INSECT PEST EGGS, AND ALL FORMS OF INFESTATION,
ALL PLANT MATERIAL SHALL BE FRESH, FREE FROM TRANSPLANT SHOCK OR VISIBLE WILT, PLANTS DEEMED UNHEALTHY WILL BE REJECTED.
10,ALL CONTAINER STOCK SHALL HAVE BEEN PROPAGATED IN A CONTAINER LONG ENOUGH FOR THE ROOT SYSTEM TO HAVE DEVELOPED
SUFFICIENTLY TO HOLD ITS SOIL. CONTAINER STOCK WITH POORLY DEVELOPED ROOT SYSTEMS WILL NOT BE ACCEPTED.
11.13LANTS NOT INSTALLED ON THE DAY Or ARRIVAL ON SITE SHALL BE STORED AND PROTECTED BY THE CONTAINER. OUTSIDE STORAGE AREAS
WILL BE SHADED AND PROTECTED FROM THE WIND AND SUN. PLANTS STORED ON SITE SHALL BE PROTECTED FROM ANY DRYING AT ALL
TIMES BY COVERING THE BALLS OR ROOTS WITH MOIST SAWDUST, WET BURLAP, WOOD CHIPS, SHREDDED BARK, PEAT MOSS, OR OTHER
SIMILAR MULCHING MATERIAL
12.THE OWNER RESERVES THE RIGHT TO SUBSTITUTE PLANT MATERIAL TYPE, SIZE AND/OR QUANTITY. ANY SUBSTITUTIONS MUST BE APPROVED
BY THE DESIGNER.
11MINOR FIELD ADJUSTMENTS MAY HE NECESSARY DUE TO SITE CONDITIONS (EX: ROOTBALL AND UTILITY CONFLICT), MAJOR ADJUSTMENTS
MUST BE APPROVED BY THE DESIGNER.
14.NO PLANTING SHALL OCCUR WHEN THE SOIL 15 FROZEN,
ISYLANT MATERIAL SHALL BE PLACED IN EXISTING SOIL WITH EACH PLANTING PIT EXCAVATED TO A SIZE SUFFICIENT TO CONTAIN THE ENTIRE
ROOT BALL OR ROOT MASS, WITHOUT CRAMPING ROOT STOCK.
16.THE CONTRACTOR SHALL MAINTAIN A ONE (1) CALENDAR YEAR 90% CARE AND REPLACEMENT WARRANTY FOR ALL PLANTINGS, 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.
17.THE CONTRACTOR IS RESPONSIBLE FOR REMOVAL AND DISPOSAL OF TRASH AND DEBRIS WITHIN THE LIMITS or THE PLANTING ON A DAILY
BASIS.
I&THE CONTRACTOR WILL NOT BE RESPONSIBLE FOR PLANT MATERIAL THAT HAS BEEN DAMAGED BY VANDALISM, FIRE, OR OTHER ACTIVITIES
BEYOND THE CONTRACTOR'S CONTROL.
FACILITY CONSTRUCTION:
1. THE CONTRACTOR SHALL USE THE WET POND AS AN E&S CONTROL STRUCTURE, IF SHOWN IN THIS MANNER ON THE APPROVED ESC PLANS. IF
APPLICABLE, THE WET POND SHALL SERVE AS A SEDIMENT BASIN DURING PROJECT CONSTRUCTION. IF THIS IS DONE, THE VOLUME SHALL BE
BASED ON THE MORE STRINGENT SIZING RULE (EROSION AND SEDIMENT CONTROL REQUIREMENT VS. WATER QUALITY TREATMENT
REQUIREMENT). INSTALLATION Or THE PERMANENT RISER SHALL BE INITIATED DURING THE CONSTRUCTION PHASE, AND DESIGN ELEVATIONS
SHALL BE SET WITH FINAL CLEANOUT OF THE SEDIMENT BASIN AND CONVERSION TO THE POST -CONSTRUCTION WET POND IN MIND, THE
BOTTOM ELEVATION OF THE WET POND SHALL BE LOWER THAN THE BOTTOM ELEVATION OF THE TEMPORARY SEDIMENT BASIN/TRAP WHEN
POSSIBLE, APPROPRIATE PROCEDURES SHALL BE IMPLEMENTED TO PREVENT DISCHARGE OF TURBID WATERS WHEN THE BA-SIN/TRAP IS BEING
CONVERTED INTO A WET POND,
2. WET PONDS SHALL ONLY BE UJINSTRUCTED AFTER THE CONTRIBUTING DRAINAGE AREA TO THE POND IS COMPLETELY STABILIZED. IF THE
PROPOSED POND SITE WILL BE USED AS A SEDIMENT TRAP OR BASIN DURING THE CONSTRUCTION PHASE, THE CONTRACTOR SHALL DE -WATER'
DREDGE AND RE -GRADE THE SEDIMENT CONTROL FACILITY TO DESIGN DIMENSIONS AFTER THE ORIGINAL SITE CONSTRUCTION IS COMPLETE,
3, THE CONTRACTOR SHALL ASSEMBLE CONSTRUCTION MATERIALS ON -SITE, MAKING SURE THEY MEET DESIGN SPECIFICATIONS AND ARE
PREPARED AT STAGING AREAS WHEN POSSIBLE.
4. THE CONTRACTOR SHALL CLEAR AND STRIP THE PROJECTAREA IF REQUIRED TO THE DESIRED SUB -GRADE.
5. THE CONTRACTOR SHALL INSTALL E&S CONTROLS PRIOR TO CONSTRUCTION, INCLUDING TEMPORARY DE -WATERING DEVICES AND
STORMWATER DIVERSION PRACTICES. ALL AREAS SURROUNDING THE POND THAT ARE GRADED OR DENUDED DURING CONSTRUCTION MUST
BE PLANTED WITH TURF GRASS, NATIVE PLANTINGS, OR OTHER APPROVED METHODS OF SOIL STABILIZATION.
6. THE CONTRACTOR SHALL ALSO EXCAVATE THE CORE TRENCH AND INSTALL THE SPILLWAY PIPE.
7. THE RISER AND APPLICABLE OUTFLOW STRUCTURES SHALL BE INSTALLED, AND THE CONTRACTOR SHALL ENSURE THE TOP INVERT OF THE
OVERFLOW WEIR(S) ARE CONSTRUCTED LEVEL AT THE DESIGN ELEVATION(S),
8, THE CONTRACTOR SHALL CONSTRUCT THE EMBANKMENT AND ANY INTERNAL BERMS IN 8-TO 12-INCH LIFTS, COMPACTION SHALL BE
COMPLETED IN LIFTS WITH APPROPRIATE EQUIPMENT. THE CONTRACTOR SHALL ALSO ADHERE TO THE CLAY LINER SPECIFICATIONS OUTLINED
IN TABLE 14.4 BELOW:
rable 14.4. Clay Liner-speGfficarions
4
Permeability
NSTM 0-2434
crfltsec
0�
I x
Plasticlj Inftx of- Clay
ASTM D4,2314124-
%
W Isss flan 15
LLaid: Limit cifiClay
MTM D-2216
%
Not less than 30
Gay Paitides Pzo sMg
A3TM D-422
%
Not less than 30
_Gf@y Gumpan
Aa-
ASTWT D-2216 -
%
95% of standard pfudm ftWdy.
--ource: managunent Hamoom
9. EXCAVATION AND GRADING TO THE APPROPRIATE ELEVATIONS AND DESIRED CONTOURS SHALL BE ACHIEVED FOR THE BOTTOM AND SIDE
SLOPES OF THE POND.
10,THE EMERGENCY SPILLWAY SHALL BE CONSTRUCTED IN CUT WHERE POSSIBLE, OR IN STRUCTURALLY STABILIZED SOILS.
Ii.THE OUTLET PIPES, INCLUDING DOWNSTREAM RIP -RAP APRON PROTECTION, SHALL BE INSTALLED,
12.EXPOSED SOILS SHALL BE STABILIZED WITH TEMPORARY SEED MIXTURES APPROPRIATE FOR THE POND BUFFER. ALL AREAS ABOVE THE
NORMAL POOL ELEVATION SFIALL BE PERMANENTLY STABILIZED BY HYDROSEEDING OR SEEDING OVER STRAW.
11THE POND BUFFER AREA SHALL BE PLANTED WITH A VEGETATIVE GROUND COVER AND THE CONTRACTOR SHALL THEN INSTALL THE
APPROPRIATE BASIN LANDSCAPING IN ACCORDANCE WITH THE APPROVED PLANS.
14.ALL CONSTRUCTION SHALL ADHERE TO THE VIRGINIA DEQ POST CONSTRUCTION LIMP CLEARINGHOUSE REQUIREMENTS SET FORTH IN DESIGN
SPECIFICATION NUMBER 14,
FACILITY MAINTENANCE:
MAINTENANCE OF THE WET POND{ 4) 15 DRIVEN BY ANNUAL INSPECTIONS THAT EVALUATE THE CONDITION AND PERFORMANCE OF THE POND.
DURING THESE INSPECTIONS THE FOLLOWING TASKS SHALL BE PERFORMED BY THE CONTRACTOR IN THE FIRST YEAR FOLLOWING INSTALLATION,
AND THE OWNER THEREAFTER:
1. MEASURE SEDIMENTACCUMtJLATION LEVELS IN THE FOREBAY,
1. MONITOR THE GROWTH OF WETLANDS, TREES AND SHRUBS PLANTED, AS APPLICABLE, RECORD THE SPECIES AND THEIR APPROXIMATE
- COVERAGE, AND NOTE THE PRESENCE OF ANY INVASIVE PLANT SPECIES, AS APPLICABLE
2. INSPECTTHE CONDITION OF STORMWATER INLETS TOTHE POND FOR MATERIAL DAMAGE, EROSION OR UNDERCUTTING,
3. INSPECT THE BANKS OF UPSTREAM AND DOWNSTREAM CHANNELS FOR EVIDENCE OF SLOUGHING, ANIMAL BURROWS, BOGGY AREAS, WOODY
GROWTH, OR GULLY EROSION THAT MAY UNDERMINE EMBANKMENT INTEGRITY,
4. INSPECT POND OUTFALL CHANNEL FOR EROSION, UNDERCUTTING, RIP -RAP DISPLACEMENT, WOODY GROWTH, ETC.
5. INSPECT CONDITION OF PRINCIPAL SPILLWAY, EMERGENCY SPILLWAY, RISER, ORIFICES & TRASHRACKS FOR EVIDENCE OF SPAILLING, JOINT
FAILURE, LEAKAGE, CORROSION OR OTHER FAILURES.
6. INSPECT CONDITION OF ALLTRASH RACKS OR FLASHBOARD RISERS FOR EVIDENCE OF CLOGGING, LEAKAGE, DEBRIS ACCUMULATION OR OTHER
FAILURES.
7. INSPECT MAINTENANCE ACCESS TO ENSURE IT IS FREE OF WOODY VEGETATION, AND CHECK TO SEE WHETHER VALVES, MANHOLES AND LOCKS
CAN BE OPENED AND OPERATED,
8. INSPECT INTERNAL AND EXTERNAL SIDE SLOPES OF THE POND FOR EVIDENCE OF SPARSE VEGETATIVE COVER, EROSION, OR SLUMPING, AND
MAKE NEEDED REPAIRS IMMEDIATELY,
9. REPAIR AND REPLACE AS NECESSARY.
10.PLEASE SEE THE TABLE BELOW FOR ADDITIONAL MAINTENANCE MEASURES ABOVE AND BEYOND THOSE OUTLINED ABOVE:
Tab k 14.6. Typic-ai Wer Pon# fifamteftaRce Tasks and Fmqvency
-
Mowing - twice a year
QtLa4edy of after mal1w stoffm
&
Remom 41eMs and blockages
(-I inch off minfall)�
s
Repair m0ercul, eroded, and bare soil areas
.
Mowing
Twt_e a year
-
Shofeftim de-anup to renmve trash, debyis and
flvalabWs
A fLAI maintenance inspection
Annually
CiDenup the ma to acepess and 1100 the VaIVA-3
Repair broken mechan"I components, if headed
One tinie -during the
Pond
560nd ye aar follm" ON-Struchm
FGrebaySediment Removal
Evwy 5 to 7 years
11--mair pW,Ih#ft8a_r and splhwy, as neMed
From b% to 2,13 years
FACILITY INSPECTION:
MULTIPLE INSPECTIONS ARE CRITICAL TO ENSURE THE BASIN(S) ARE PROPERLY CONSTRUCTED. BECAUSE THE TIMING OF THE INSTALLATION IS
DICTATED BY THE CONTRACTOR, THE CONTRACTOR SHALL BE RESPONSIBLE FOR CONTACTING THE ENGINEER AND INSPECTOR PRIOR TO
INSTALLATION, MULTIPLE SITE VISITS AND INSPECTIONS ARE REQUIRED TO BE SCHEDULED BY THE CONTRACTOR, WITH THE ENGINEER AND
INSPECTOR, DURING THE FOLLOWING STAGES OF THE WET POND'S CONSTRUCTION PROCESS.
1. PRE -CONSTRUCTION MEETING
2, INITIAL SITE PREPARATION (INCLUDING INSTALLATION OF PROJECT E&S CONTROLS)
3. EXCAVATION/GRADING (EA, INTERIM/FINAL ELEVATIONS)
4. WET POND INSTALLATION (E.G., INTERIM AND FINAL ELEVATIONS)
S. INSTALLATION or THE EMBANKMENT, EMERGENCY SPILLWAY, THE RISER/PRIMARY SPILLWAY AND THE OUTLET CONTROLSTRUCTURE(S).
6. PLANTING AND VEGETATIVE STABILIZATION PHASE (WITH AN EXPERIENCED LANDSCAPE ARCHITECT PRESENT)
7, FINAL INSPECTION (DEVELOP A PUNCH LIST FOR FACILITY ACCEPTANCE)
op�
Ypq
SCOTT R. COTJJNS'Z
I -"-
No. 35791
II IIIII0
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