HomeMy WebLinkAboutWPO201700052 Plan - VSMP WPO VSMP 2018-06-1915014,114.0r,
NOTE: EACH LOT AS SHOWN HEREIN SHALL CONTAIN A BUILDING 517E WHICH MEETS THE REOUIRE14ENTS
OF SECTION 4.2.2(b)l (18-520)
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DUNLOrv-% INVESTMENTS, LLC
455 SECOND STREET SE, SUITE 400
CHARLOTTESVILLE, VA 22902
SCALE: 1"=60'
ENGINEER
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COLLINS ENGINEERING
200 GARRETT STREET, SUITE K
CHARLOTTESVILLE, VA 22902
VICINITY MAP
SCALE: 1" = 500'
Sheet List Table
455 SECOND ST SE, SUf IF 400
Sheet Title
CHARLOT7ESWLLE, VA 22902
ENGINEER:
COLLINS ENGINEERING
EX. CONDITIONS AND DEMOLITION PLAN
200 GARRETT ST SUITE K
EROSION & SEDIMENT CONTROL NARRATIVE
CHARLOTTESVILLE, VA 22902
PHAS !EROSION & SEDIMENT CONTROL PLAN
(434)293-3719
SURVEYOR.
CARDINAL SURVEY
TAX MAP PARCEL:
06100-00-00-1 6580 (08 4967 PC 169) SEE EX. COND177ONS FOR ALL NEW
EROSION & SEDIMENT CONTROL NOTES& DETAILS
PARCELS
TOTAL PROJECT AREA:
8.62 ACRES TOTAL (1.17 ACRES PHASE /1)
ZONING.
R-4 RESIDENTIAL (BY -RIGHT) - NO PROFFERS
STORMWATER MANAGEMENT NOTES& DETAILS
AIRPORT IMPACT AREA (AIA)
PROPOSED USE.•
16 SINGLE FAMILY ATTACHED UNITS AND
EA757ING CON70UR
12 SINGLE FAMILY DETACHED UNITS AND
14 TOWNHOUSES
REQUIRED DENSITY
4 DUMC BONUS LEVEL CLUSTER DEVELOPMENT (NO MINIMUM LOT SIZE)
PROPOSED DENSITY
42 DU/8.62 AC = 4.87 UNITS/AC
OPEN SPA CE-
REQ. 216 AC OF DEVELOPMENT AREA (25Z);
PRO!/ OPEN SPACE A (0.09 AC) + OPEN SPACE B (2.54 AC) = 2.63 AC (31x)
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0.84 AC OUTSIDE CRI77CAL SLOPES AND SWM (32Z OF TOTAL)
THE OPEN SPACE WILL BE DED1CA7E0 TO 77.1E HOA.
BUILDING HEIGHTS.
MAXIMUM BUILDING HEIGHTS SHALL NOT EXCEED 35 FEET
NON -INFILL SETBACKS.
FRONT- 5^* MIN AND 25' MAX
SIDE: 10' BUILDING SEPARA77ON
REAR. 20' MIN AND NO MAX
S17E AMENIRES.•
2.63 ACRES OPEN SPACE (PASSIVE RECREA77ON AREA)
SUBDIVISION SHEETS.•
PHASE I - CURB & GUT7FR (PARKING ON ONE SIDE ONLY)
PHASE 11 - UNITS FRONTING RIO ROAD & DUNLORA DRIVE WITH
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PRIVA 7E ACCESS ALLEY FROM VARICK S7REET
WA TERSHED:
THIS PARCEL IS NO T IN A WA TER SUPPLY Y PRO TFC7ED AREA - SI7F
DRAINS TO MEADOW CREEK (UPPER RIVANNA WA7ERSHED)
AGRICUL77JRALI FORESTAL DISTRICT NONE
TOPO & SURVEY-
TOPOGRAPHY & BOUNDARY INFORMA77ON PROVIDED ON -GROUND BY CARDINAL
SURVEY IN SEPTEMBER 2016, AND FROM DEEDS AND PLANS OF RECORD. SLOPES
HAVE BEEN DETERMINED LESS THAN 25X WHERE INDICATED PER NEW
TOPOGRAPHIC SURVEY AND SLOPES EXHIBIT PROWDED BY ROUDABUSH, GALE;
AND ASSOCIATES DATED MAY 18, 2017, AS PERMITTED UNDER SEC77ON
30, 7.4 (b)(h).
DATUM:
NAD 83
EXIS77NG VEGETA 770N.
PAR77ALLY WOODED WITH EXISTING RESIDENCE STRUCTURES
CRITICAL SLOPES.
MANAGED AND PRESERVED S7EEP SLOPES ARE SHOW AND LABELED.
PRESERVED SLOPES HAVE BEEN FIELD SURVEYED AND UPDA 7ED PER EXHIBIT
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PROVIDED BY ROUDABUSH, GALE, AND ASSOCIA 7ES DA 7ED MAY 18, 2017, AS
CD
PERMITTED UNDER SEC77ON 30.Z4(b)(h). THE FIELD SURVEYED AREAS THAT ARE
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NOT PRESERVED SLOPES SHALL BE TREA7ED AS MANAGED SLOPE AREAS.
LIGH77NG.•
NO LIGH77NG IS PROPOSED
PHASING.
O BE DEVELOPED IN TWO PHASES.
SITE" T
U77LI77ES.
PUBLIC WATER AND SEWER
FIRE & RESCUE.
AS REQUIRED, ALL FIRE FLOWS WTHIN THE DEVELOPMENT SHALL BE A MINIMUM
OF 1000 GPM AT 20 PSI. ADDITFONALLY, FIRE HYDRANTS SHALL BE PROVIDED
ALONG THE ROADWAYS FOR FIRE PREVEN77ON AT A MAXIMUM SPACING OF 500
FT PER TRAVEL WAY
RECREA 770N.-
NOT APPLICABLE11VOT REQUIRED
PARKING.•
PHASE 1.• 2 OFF-STREET PARKING SPACES SHALL BE PROVIDED FOR EACH
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SINGLE FAMILY DWELLING UNIT + 4 ON -STREET GUEST SPACES(MIN) FOR THE
poll
ATTACHED UN17S 6 ON -STREET GUEST SPACES SHALL BE LOCA 7E0 ALONG THE
02
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ROADWAYS WHERE MARKED.
0
PHASE If. 2 OFF-STREET PARKING SPACES SHALL BE PROVIDED FOR EACH
DWELLING UNIT + 1 SPACE PER (4) UNITS FOR GUEST PARKING:
TOTAL PARKING REQUIRED:
28 SPACES ON THE LOTS + (4) GUEST SPACES
TOTAL PARKING PROVIDED:
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28 SPACES ON T 14 LOTS + (6) GUEST SPACES
BUILDING S17ES.
PARCELS 1-42 MAY NOT BE FUR7HER DIVIDED. ONLY (1) DWELLING UNIT PER
LOT SHALL BE ALLOWED.
BURIAL SHES.
NONE
S7REAM BUFFERSIFLOODPLAIN.• THERE IS A POR77ON OF A WPO S7REAM BUFFER LOCA7ED AT THE
SOUTHEAST CORNER OF 77 fE SITE. THERE IS NO 100- YEAR FLOODPLAIN LIMITS'
ON 714E SUBJECT PARCEL, PER FEMA MAP 51003CO229D, FEBRUARY 4, 2005
OFFS17E DISTURBANCE.•
NO OF-FS17E DISTURBANCE IS PROPOSED WITH THIS PLAN, EXCEPT FOR 7HE
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14
77E -IN CONNEC77ON TO 7HE SANITARY SEWER N7HIN EXIS77NG U77LITY EASEMENT,
LANDSCAPING.•
ALL PROPOSED ROADWAYS SHALL HAVE STREET TREES IN ACCORDANCE WITH
ALBEMARLE COUNTY REQUIREMENTS, PER SEC77ON 32.7.9 OF THE ZONING
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ORDINANCE
RETAINING WALLS:
FOUR SEGMENTAL RETAINING WALLS ARE APPROVED (PHASE I)
SIGNAGE-
NO SIGNAGE CURREN 7LY PROPOSED.
MASH COLLECTION.
TRASH RECEPTACLES SHALL BE MAINTAINED ON EACH INDIVIDUAL LOT ALL
7RASH SHALL BE COLLEC7ED BY A DRIVING DUMPSTER SERVICE
DAM INUNDA 770N.
THIS Sl7E IS NOT W THIN A DAM INUNDA 77ON ZONE
STORMWA7ER MANAGEMENT- STORMWA7ER WILL BE CONVEYED TO A LEVEL /I 810FILTER WITH
DOWNSTREAM DE7EN77ON BASIN AND A DRY DETEN77ON BASIN. AN
UNDERGROUND DETENTION FACILITY NTH BYPASS SHALL SERVE THE TOW&OMES.
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SEE SWM PLAN FOR DETAILS.
IMPERVIOUS AREAS.
SEE SWW PLAN
LAND AREAS:
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OPEN SPA CE: 263 AC. (31X)
LOTS 4.78 AC. (55X)
ROW DEDICATION: 1.21 AC. (14Z)
TRAFFIC GENERA 770N.
TRIP GENERA 77ON BASED ON /7E GENERA 77ON MANUAL (8774 E01770N)
28 SINGLE FAMILY UN17S (CODE 210)
268 VPD (134 EN7ER1134 EXIT)
AM PEAK.• 21 (5 ENTER/16 EXIT)
PM PEA K.- 28 (18 ENTER/10 EXIT)
14 TOWNHOME UNITS (CODE 230)
81 VPD (40 EN7ER141 EXIT)
AM PEAK: 6 (1 EN7ER15 EXIT)
PM PEAK. 7 (5 EN7ER12 EXIT)
NOTE: EACH LOT AS SHOWN HEREIN SHALL CONTAIN A BUILDING 517E WHICH MEETS THE REOUIRE14ENTS
OF SECTION 4.2.2(b)l (18-520)
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11A
DUNLOrv-% INVESTMENTS, LLC
455 SECOND STREET SE, SUITE 400
CHARLOTTESVILLE, VA 22902
SCALE: 1"=60'
ENGINEER
0
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----------
COLLINS ENGINEERING
200 GARRETT STREET, SUITE K
CHARLOTTESVILLE, VA 22902
VICINITY MAP
SCALE: 1" = 500'
Sheet List Table
Sheet Number
Sheet Title
1
COVER
2
EX. CONDITIONS AND DEMOLITION PLAN
3
EROSION & SEDIMENT CONTROL NARRATIVE
00
PHAS !EROSION & SEDIMENT CONTROL PLAN
5
PHASE 11 EROSION & SEDIMENT CONTROL PLAN
5A
PHASE III EROSION & SEDIMENT CONTROL PLAN
6
EROSION & SEDIMENT CONTROL NOTES& DETAILS
7
STORMWATER MANAGEMENT PLAN
(PRE—DEVELOPMENT)
8
STORMWATER MANAGEMENT PLAN
(POST—DEVELOPMENT)
9
STORMWATER MANAGEMENT NOTES& DETAILS
10
STORM WATER MANAGEMENT NOTES & DETAILS
Is
TOTAL NUMBER OF SHEETS
AMENDED TO INCLUDE: -
1. NEW GRADING AND PROPOSED ALLEY FOR PHASE 11
DEVELOPMENT OF PROJECT
2. NEW SEDIMENT TRAP & UNDERGROUND DETENTION FOR PHASE IIS
DEVELOPMENT OF PROJECT AND UPDATED ESC AND SWM
APPROVED
by the, C..,)unty
Community
Date
File_
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PROPOSED PERM PAPERS -
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GENERAL NOTES
1, THE OWNER/DEVELOPER OF THIS PROPERTY IS:
DUNLORA INVESTMENTS, LLC
455 SECOND STREET SE, SUITE 400
CHARLOTTESVILLE, VA 22902
2. THESE PLANS HAVE BEEN PREPARED BY:
COLLINS ENGINEERING, INC
200 GARRETT STREET, SUITE K
CHARLOTTESVILLE, VA 22902
TELEPHONE: (434) 293-3719 FACSIMILE: (434) 293-2813
3, SOURCE OF TOPO & SURVEY: ON -GROUND SURVEY PROVIDED BY CARDINAL
SURVEY IN SEPTEMBER 2016, AND FROM DEEDS AND PLANS OF RECORD.
4. ZONING: R-4 RESIDENTIAL
5. TAX MAP AND PARCEL NUMBER: TMP 61-165
6, USGS DATUM: NAD 83
7. LOCATION/'ADDRESS OF PROJECT DUNLORA DRIVE
8. PROJECT AREA: 8.62 ACRES
9. SITE PHASING: NONE
10, PUBLIC UTIL111ES: WATER & SEWER
* COLLINS ENGINEERING SHALL NOT HAVE AUTHORITY OVER CONTRACTOR'S WORK,
SAFETY PRECAUTIONS, SCHEDULES, OR COMPLIANCE WITH LAWS AND
REGULATIONS. WE SHALL NOT ASSUME RESPONSIBILITY FOR ANY
CONSTRUCTION STARTED PRiOR TO PLAN APPROVAL.
EROSION & SEDIMENT C'ONT'ROL
STRUCTURAL EROSION AND SEDIMENT CONTROL PRACTICES SHALL BE IN
ACCORDANCE WITH THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK.
S7RUCTURAL PRAC77CES USED IN THIS SEC7ION CONSIST OF THE FOLLOWING.
3.01 SAFETY FENCE
A PR07EC77VE BARRIER INSTALLED TO PREVENT ACCESS TO AN EROSION CON7ROL
MEASURE. TO PROHIBIT THE UNDESIRABLE USE OF AN EROSION CON7ROL MEASURE BY
THE PUBLIC. APPLICABLE TO ANY CON7ROL MEASURE OR SERIES OF MEASURES WHICH
CAN BE CONSIDERED UNSAFE BY WR7UE OF P07EN77AL ACCESS BY THE PUBLIC.
3.02 CONSTRUCTION EN7RANCE-
A STABILIZED PAVED CONS7RUC77ON EN77?ANCE WITH A WASH RACK LOCATED AT POINTS
OF VEHICULAR INGRESS AND EGRESS ON A CONSTRUCTION SITE. TO REDUCE THE
AMOUNT OF MUD TRANSPORTED ONTO PAVED PUBLIC ROADS BY MOTOR VEHICLES OR
RUNOFF CONS7RUC770N ENTRANCES SHALL BE INSTALLED AS SHOWN ON THE PLANS TO
REDUCE THE AMOUNT -SEDIMENT TRANSPORTED ONTO PUBLIC ROADWAYS.
.105 SILT FENCE.-
A TEMPORARY SEDIMENT BARRIER CONSIS77NG OF A SYNTHE77C F7L7ER FABRIC STRETCHED
ACROSS AND ATTACHED TO SUPPOR77NG POSTS AND ENTRENCHED, TO INTERCEPT AND
DETAIN SMALL AMOUNTS OF SEDIMENT FROM DISTURBED AREAS DURING CONSIRUC77ON
OPERA77ONS IN ORDER TO PREVENT SEDIMENT FROM LEAVING THE S17E, AND 70
DECREASE 774E VELOCITY OF SHEET FLOWS AND LOW=TO-MODERATE LEVEL CHANNEL
FLOWS. 774E SILT FENCE BARRIERS SHALL BE INSTALLED DOWN SLOPE OF AREAS Wt774
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 THE VIRGINIA EROSION & SEDIMENT CONTROL HANDBOOK (VESCH).
3.07 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 ENTERING STORM DRAINAGE
SYSTEMS PRIOR TO PERMANENT STABILIZA77ON OF THE DISTURBED AREA. INLET
PROTECTION APPLIES WHERE STORM DRAIN INLETS ARE TO BE MADE OPERA71ONAL
BEFORE PERMANENT STABILIZATION OF THE CORRESPONDING DISTURBED DRAINAGE AREA.
3.09 TEMPORARY DIVERSION DIKE,
A TEMPORARY RiDGE OF COMPAC7FD SOIL CONSTRUC7ED 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 TRAP OR SEDIMENT BASIN. USE WHEREVER STORMIMMER
RUNOFF MUST BE TEMPORARILY DIVERTED TO PR07ECT DISTURBED AREAS AND SLOPES
OR RETAIN SEDIMENT ON S17E DURING CONS7RUCRON. THESE STRUCTURES GENERALLY
HAVE A LIFE EXPECTANCY OF 18 MONTHS OR LESS, WHICH CAN BE PROLONGED WITH
PROPER MA1N7E'NANCE.
113 TEMPORARY SEDIMENT TRAP:
A TEMPORARY PONDING AREA FORMED BY CONSTRUC77NG AN EARTHEN EMBANKMENT WITH
A STONE OUTLET. TO DETAIN SEDIMENT -LADEN RUNOFF FROM SMALL DISTURBED AREAS
LONG ENOUGH TO ALLOW THE MAJORITY OF THE SEDIMENT TO SETTLE OUT: USE BELOW
DISTURBED AREAS INHERE THE TOTAL CON7R1BU77NG DRAINAGE AREA IS LESS THAN 3
ACRES WHERE 7HE SEDIMENT TRAP WILL BE USED NO LONGER 7HAN 18 MON7NS, AND IT
MAY BE CONSTRUC7FD EITHER INDEPENDENTLY OR IN CONJUNC770N WITH A TEMPORARY
DI VERSION DIKE.
T 14 TEMPORARY SEDIMENT BASIN:
A 7FMPORARY BARRIER OR DAM WITH A CONTROLLED STORMWATER RELEASE STRUCTURE
FORMED BY CONS7RUC77NG AN EMBANKMENT OF COMPACTED SOIL ACROSS A
DRAINAGEWAY, Tfl DETAIL SEDIMENT -LADEN RUNOFF FROM DISTURBED AREAS
IN "WET" AND `DRY" STORAGE LONG ENOUGH FOR THE MAJORITY OF THE SEDIMENT TO
SETTLE OUT: APPLIES BELOW DISTURBED AREAS INHERE THE TOTAL CONTRIBU77NG
DRAINAGE AREA IS EQUAL TO OR GREATER THAN THREE ACRES THERE MUST BE
SUFFICIENT SPACE AND APPROPRIATE TOPOGRAPHY FOR THE CONSTRUC77ON OF A
TEMPORARY IMPOUNDMENT.
J. 18 OUTLET P007EC770N.•
S7RUC7iURALLY LINED APRONS OR OTHER ACCEPTABLE ENERGY DISSIPA77NG DEVICES
PLACED AT THE OUTLETS OF PiPES OR PAVED CHANNEL SEC7701VS TO PREVENT SCOUR
AT STORMWATER OU7LET5; TO PROTECT 774E OUTLET S'7RUC7URE, AND TO MINIMIZE THE
PO7EN71AL FOR DOWNSTREAM EROSION BY REDUCING THE VELOCITY AND ENERGY OF
CONCEN77?A7ED STORMIMMER FLOWS APPLICABLE TO THE OUTLETS OF ALL PIPES AND
ENGINEERED CHANNEL SE077ONS.
J. 19 RIPRAP
A PERMANENT, EROSION -RESISTANT GROUND COVER OF LARD& LOOSE, ANGULAR STONE
FROM 774E
OTECT 774E SOIL
TO PR
WITH FILTER FABRIC OR GRANULAR UNDERLINING,
O CONCEN7RATED
E VELOCITY F
CENTRA
IED RUNOFF
SLOW 774
FORCES OF CON ,
EROSIVE F
RUNOFF WHILE ENHANCING THE POTENTIAL FOR INFIL77?A770N, AND TO STABILIZE SLOPES
EVER SOIL AND
S. USE WHET
SIVE SOIL
NON -COHESIVE S, AND OR C
WITH SEEPAGE PROBLEM
VELOCITY,
LENCE AND
WATER TURBO
WATER INTERFACE AND THE SOIL CON01710NS, W
EXPEC7ED VEGETATIVE COVER, ETC., ARE SUCH THAT THE SOIL MAY ERODE UNDER 7HE
DESIGN FLOW CONDITIONS,
THE ESTABLISHMENT OF A TEMPORARY VEGETA77VE COVER ON DISTURBED AREAS BY
SEEDING W1?774 APPROPRIATE RAPIDLY GROWING ANNUAL PLANTS. TO REDUCE EROSION
AND SEDIMENTA77ON BY STABILIZING DIS7URBED AREAS THAT WILL NOT BE BROUGHT TO
FINAL GRADE FOR A PERIOD OF MORE THAN 30 DAYS 70 REDUCE DAMAGE FROM
SEDIMENT AND RUNOFF 70 DOWNS7REAM OR OFF-SITE AREAS, AND TO PROVIDE
PR07EC7701V TO BARE SOILS EXPOSED DURING CONSTRUCTION UN77L PERMANENT
VEGETATION OR OTHER EROSION CONTROL MEASURES CAN BE ESTABLISHED.
3,J2 PERMANENT STABILIZATION.•
THE ESTABLISHMENT OF PERENNIAL VEGETATIVE COVER ON DISTURBED AREAS BY
PLAN77NG SEED. TO REDUCE EROSION AND DECREASE SEDIMENT YiELD FROM DISTURBED
AREAS TO PERMANENTLY STABILIZE DiS7URBED AREAS IN A MANNER THAT IS
>tirf)A1f) rrrA1 AnAPTARI F Tri S1TF CON0177ONS. AND ALLOWS SELEC7ON OF 7HE MOST
APPROPRIATE PLANT MA7ERIALS TO IMPROVE WILDLIFE HABITAT. TO ENHANCE NATURAL
BEAUTY, UPON COMPLETION OF CONS7RUC7ION A077147TES, ALL AREAS WILL RECEIVE A
PERMANENT VEGETAINE COVER.
3 3R TREE PRESERVA770N AND PROiTE•C770N•
PR07EC77ON OF DESIRABLE TREES FROM MECHANICAL OR OTHER INJURY DURING LAND
DISTURBING AND CONS7RUCTTON AC77WTY. TO ENSURE THE SURVIVAL OF DESIRABLE
TREES WHERE THEY WiLL BE EFFECTIVE FOR EROSION AND SEDIMENT CONTROL,
WATERSHED PROTFC7701% LANDSCAPE BEAUTIFICATION, DUST AND POLLUTION CON7ROL,
NOISE REDUCTION, SHADE AND 0774ER ENVIRONMENTAL BENEFITS WHiLE THE LAND IS
BEING CONVERTED FROM FOREST TO URBAN -TYPE USES. APPLIES IN TREE INHAB17ED
AREAS SUBJECT TO LAND DISTURBING ACTIVITIES.
3.39 DUST CON7ROL:
REDUCING SURFACE AND AIR MOVEMENT OF DUST DURING LAND DISTURBING, DEMOL1770N
AND CONSTRUCTION AC77W77ES TO PREVENT SURFACE AND AIR MOVEMENT OF DUST
FROM EXPOSED SOiL SURFACES AND REDUCE THE 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 CONS7RUC770N. MEASURES EMPLOYED SHALL BE IN
ACCORDANCE WITH 7HE VESCH.
SOIL DESCRIPTIONS
2C- ALBEMARLE FINE SANDY LOAM - 7% TO 15% SLOPES.
SOIL CONSISTS OF DEEP, WELL DRAINED SOILS. SURFACE RUNOFF IS MEDIUM TO LOW
WITH MODERATELY HIGH PERMEABILITY. HYDROLOGIC SOIL CROUP `CE.
22B- CULPEPER FINE SANDY LOAM - 2% TO 7% SLOPES.
SOIL IS DEEP, WELL -DRAINED WITH MODERATE PERMEABILITY. FORMED IN RESIDUUM
WEATHERED FROM META-ARKOSIC SANDSTONE. HYDROLOGIC SOIL GROUP'S'.
39D - HAZEL LOAM - 25% TO 2S% SLOPES.
SOIL IS DEEP, WELL -DRAINED WITH MODERATE PERMEABILITY. FORMED IN RESIDUUM
WEATHERED FROM GREYWACKE SANDSTONE. HYDROLOGIC SOIL GROUP W.
EROSION CONTROL NOTES
ES -1: UNLESS OTHERWISE INDICATED, ALL VEGETATIVE AND STRUCTURAL EROSION
AND SEDIMENT CONTROL PRACTICES WiLL BE CONSTRUCTED AND
MAINTAINED ACCORDING TO MiNiMUM STANDARDS AND SPECIFICATIONS OF
THE 14RGINIA EROSION AND SEDIMENT CONTROL HANDBOOK AND VIRGINIA
REGULATIONS VR 525-02-00 EROSION AND SEDIMENT CONTROL
REGUL,A TIONS
ES -2: THE PLAN APPROWNG AUTHORITY MUST BE N077FIED ONE WEEK PRIOR TO
THE PRE-CONS7RUCTION CONFERENCE, ONE WEEK PRIOR TO 774E
COMMENCEMENT OF LAND DISTURBING AC77Y1TY, AND ONE WEEK PRIOR TO
THE FINAL iNSPEC770N.
ES -J. 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 THE SITE AT ALL TIMES.
ES -5: PRIOR TO COMMENCING LAND DISTURBING ACTI V7TIES IN AREAS OTHER 77 -IAN
INDICATED ON THESE PLANS ('INCLUDING BUT NOT LIMITED TO, OFF-SITE
BORROW OR WASTE AREAS), TETE CONTRACTOR SHALL SUBMIT A
SUPPLEMENTARY EROSION CONTROL PLAN TO THE OWNER FOR REVIEW AND
APPROVAL BY THE PLAN APPROVING AUTHORITY.
ES-6:7HE CONTRACTOR IS RESPONSIBLE FOR INSTALLA77ON 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 CON7ROL
MEASURES AT ALL 77MES DURING LAND DISTURBING AC771477ES AND DURING
SITE DEVELOPMENT UN77L FINAL STABILiZA77ON IS ACHIEVED.
ES-B.•DURING DEWATERING OPERATIONS, WATER WiLL BE PUMPED INTO AN
APPROVED WATER FILTERING DEVICE
ES -9: THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES
PERIODICALLY AND AFTER EACH RUNOFF -PRODUCING RAINFALL EVENT:
ANY NECESSARY REPAIRS OR CLEANUP TO MAINTAIN THE EFFEC77VENESS
OF THE EROSION CONTROL DEVICES SHALL BE MADE IMMEDIATELY
EROSION CONTROL NOTES
1. THE PLAN APPROVING AUTHORITY MUST BE NOTIFIED ONE WEEK PRIOR TO THE
PRE -CONSTRUCTION CONFERENCE, ONE WEEK PRIOR TO THE COMMENCEMENT 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 SPECIFICATIONS OF THE VIRGINIA EROSION AND
SEDIMENT CONTROL HANDBOOK AND VIRGINIA REGULATIONS VR 625-02-00 EROSION AND
SEDIMENT CONTROL REGULATIONS.
3. ALL EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE PLACED PRiOR TO OR AS
THE FIRST STEP IN CLEARING.
4. A COPY OF THE APPROVED EROSION AND SEDIMENT CONTROL PLAN SHALL RE
MAINTAINED ON THE SITE AT ALL TIMES.
5. PRIOR TO COMMENCING 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 DRAIN TO APPROVED SEDIMENT CONTROL MEASURES AT
ALL TIMES IDURING LAND DISTURBING ACTIVITIES AND DURING SITE DEVELOPMENT UNTIL
FINAL STABILIZATION IS ACHIEVED.
8. DURING DEWATERING OPERATIONS, WATER WILL BE PUMPED INTO AN APPROVED FILTERING
DEVICE.
9. THE CONTRACTOR SHALL INSPECT ALL EROSION CONTROL MEASURES PERIODICALLY AND
AFTER EACH RUNOFF PRODUCING RAINFALL EVENT, ANY NECESSARY REPAIRS OR CLEANUP
TO MAINTAiIN THE EFFECTIVENESS OF 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 AN 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 5,1.28.
13. ALL INERT (MATERIALS SHALL BE TRANSPORTED IN COMPLIANCE WITH SECTION 13-301 OF
THE CODE OF ALBEMARLE.
14. BORROW, FULL OR WASTE ACTIVITY INVOLVING INDUSTRIAL -TYPE POWER EQUIPMENT SHALL
BE LIMITED
TO THE HOURS OF 7:OOAM TO 9:OOPM.
15, BORROW, FULL OR WASTE ACTIVITY SHALL BE CONDUCTED iN A SAFE MANNER THAN
MAINTAINS LATERAL SUPPORT, OR ORDER TO MINIMIZE ANY HAZARD TO PERSONS,
PHYSICAL DAMAGE TO ADJACENT LAND AND IMPROVEMENTS, AND DAMAGE TO ANY PUBLIC
STREET BECAUSE 0 SLIDES, SINKING, OR COLLAPSE.
16. THE DEVELOPER SHALL RESERVE THE RIGHT TO INSTALL, MAINTAIN, REMOVE OR CONVERT
TO PERMANENT STORMWATER MANAGEMENT FACILITIES WHERE APPLICABLE ALL EROSION
CONTROL MEASURES 's'EQUIRED BY THIS PLAN REGARDLESS OF THE SALE OF ANY LUT,
UNIT, BUILDING OR OTHER PORTION OF THE PROPERTY.
17. TEMPORARY STABiUZATION SHALL BE TEMPORARY SEEDING AND MULCHING. SEEDING IS TO
BE AT 75 (LBS/ACRE, AND IN THE MONTHS OF SEPTEMBER TO FEBRUARY TO CONSIST A
50/50 MIX OF ANNUAL RYEGRASS AND CEREAL WINTER RYE, OR IN MARCH AND APRIL TO
CONSIST OF ANNUAL RYE, OR MAY THROUGH AUGUST TO CONSIST OF GERMAN MILLET.
STRAW MULCH IS TO BE APPLIED AT 80LBS/100SF. ALTERNATIVES ARE SUBJECT TO
APPROVED BY THE COUNTY EROSION CONTROL INSPECTOR.
18. PERMANENT STABILIZATION SHALL BE LiME AND FERTILIZER, PERMANENT SEEDING, AND
MULCH. AGRICULTURAL GRADE LIMESTONE SHALL BE APPLIED AT 90LBS/1OOOSF,
INCORPORATED INTO THE TOP 4-6 INCHES OF SOIL. FERTILIZER SHALL BE APPLIED AT
1000LBS/A+CRE AND CONSIST OF A 10-20-10 NUTRIENT MIX. PERMANENT SEEDING SHALL
BE APPUER AT 180LBS/ACRE AND CONSIST OF 95% KENTUCKY 31 OR TALL FESCUE AND
0-595 PERENNIAL RYEGRASS OR KENTUCKY BLUEGRASS. STRAW MULCH IS TO BE APPLIED
AT 8OLBS/1OOSF. ALTERNATIVES ARE SUBJECT TO APPROVED BY THE COUNTY EROSION
CONTROL INSPECTOR.
19. MAINTENANCE: ALL MEASURES ARE TO BE INSPECTED WEEKLY AND AFTER EACH
RAINFALL. ,ANY DAMAGE OR CLOGGING TO STRUCTURAL MEASURES IS TO BE REPAIR
IMMEDIATELY, SILT TRAPS ARE TO BE CLEANED WHEN 50% OF THE WET STORAGE VOLUME
IS FILLED VMTH SEDIMENT. ALL SEEDED AREAS ARE TO BE 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 CLEANED AND REPAIRED
IMMEDiATEL',Y.
20. ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE REMOVED
WITHIN 30 (DAYS OF FINAL SITE STABILIZATION, WHEN MEASURES ARE NO LONGER NEEDED,
SUBJECT TO APPROVAL BY THE COUNTY EROSION CONTROL INSPECTOR,
21. THIS PLAN SHALL BE VOID IF THE OWNER DOES NOT OBTAIN IN A PERMIT WITH1 YEAR OF
l
THE DATE OF APPROVAL. 7- AL. WATER PROTECTION ORDINANCE SECTION 1 204G.
22. PERMANENT VEGETATION SHALL BE INSTALLED ON ALL DENUDED AREAS WITHIN NINE (9)
MONTHS AFTER THE DATE THE LAND DISTURBING ACTIVITY COMMENCED. (WATER
PROTECTiON ORDINANCE S C 0
E TI N 17-2078
X AW
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PAVED YEAH RACK
k i sckx -
CONTROL MEASURES:-
SEDIMENT BUILDUP THAT WILL PREVENT PROPER DRAINAGE. iF THE UN VE L
PURPOSE:
THE PURPOSE OF THIS LAND -DISTURBING ACTIVITY IS TO GRADE THE SITE FOR THE FUTURE DEVELOPMENT OF
ACCEP'T'ABLE TEMPORARY SEEDING PLANT MATERIALS
DUNLORA - 42 LOTS. THE TOTAL ACREAGE TO BE DISTURBED WITH THIS PLAN IS 7,09 ACRES.
EROSION AND SEDIMENT CONTROL MEASURES:
EXISTING SIT CONDITIONS:
IT IS ANTICIPATED THAT A CONSTRUCTION ENTRANCE, TEMPORARY DIVERSION
THE EXISTING SITE IS A WOODED, SLOPING PARCEL WITH AN EXISTING RESIDENCE AND OUTBUILDINGS, THE SITE IS
BERMS, RIGHT OF WAY DIVERSION, A SEDIMENT BASIN, SEDIMENT TRAPS, OUTLET
GENERALLY WELL DRAINED WITH PRESERVED AND MANAGED STEEP SLOPES. EROSION AND SEDIMENT CONTROL
PROTECTION, AND SILT FENCE WILL BE INSTALLED TO CONTROL SURFACE
MEASURES HAVE BEEN DESIGNED TO CONFORM TO THE EXISTING SITE SLOPE AND PROTECT THE PERIMETER
STREAMS AND ADJACENT PROPERTIES.
DRAINAGE. TEMPORARY SEEDING WiLL BE USED IMMEDIATELY FOLLOWING ALL
ADJACENT AREAS:
LAND DISTURBANCE ACTIVITIES. TEMPORARY STOCKPILE AREAS WILL BE
THE SITE IS BOUNDED TO THE WEST BY DUNLORA DRIVE AND TO THE SOUTH BY RIO ROAD EAST. IT iS
MAINTAINED FROM TOPSOIL THAT WILL BE STRIPPED FROM AREAS TO BE GRADED
BORDERED BY RESIDENTIAL LAND AND TWO CREEKS TO THE NORTH AND EAST.
AND STORED FOR LATER SPREADING. STOCKPILE LOCATIONS SHALL BE ON SITE
OFFSITE LAND DISTURBANCE:
AND SHALL BE STABILIZED WITH A TEMPORARY VEGETATIVE COVER. PERMANENT
NO OFF-SITE LAND DISTURBANCE IS PROPOSED.
SEEDING WILL BE PERFORMED FOR ALL AREAS WHICH WILL NO LONGER BE
CRITICAL AREAS:
EXCAVATED AND WHERE CONSTRUCTION ACTIVITIES HAVE CEASED, PERMANENT
MANAGED STEEP SLOPES TO BE IMPACTED. STREAMS AND BUFFERS TO BE PROTECTED. WOODLAND/OPEN
SEEDING SHALL ALSO BE PERFORMED FOR ALL DENUDED AREAS WHICH WILL BE
SPACE PRESERVATION AREAS TO BE MAINTAINED AND PROTECTED WITH TREE PROTECTION FENCING.
LEFT DORMANT FOR A YEAR OR MORE. SELECTION OF SEED MIXTURE WILL
SOIL SOILS:
BOUNDARIES ON THE EROSION AND SEDIMENT CONTROL PLAN SHEET, AND DESCRIPTIONS ON THIS
DEPEND ON THE TIME OF YEAR APPLIED. TEMPORARY SEEDING WILL BE
SHEET.
PERFORMED FOR ALL DENUDED AREAS WHICH WILL BE LEFT DORMANT FOR MORE
SEQUENCE OF CONSTRUC11ON:
THAN SEVEN DAYS. THESE AREAS SHALL BE SEEDED WITH FAST GERMINATING
1. NOTIFY ALBEMARLE COUNTY TO SCHEDULE A PRE -CONSTRUCTION MEETING AS REQUIRED.
VEGETATION IMMEDIATELY FOLLOWING GRADING OF THOSE AREAS. SELECTION OF
2. NO EROSION CONTROL MEASURES MAY BE REMOVED DURING THE CONSTRUCTION PROCESS WITHOUT THE
SEED MIXTURE WILL DEPEND ON THE TIME OF YEAR APPLIED.
APPROVAL FROM THE INSPECTOR ON THE PROJECT.
3. CONTRACTOR SHALL IDENTIFY THE LIMITS OF DISTURBANCE AND INSTALL TREE PROTECTION FENCING WHERE
INDICATED ON THE PLANS BEFORE ANY SITE DISTURBANCE SHALL TAKE PLACE. CONTRACTOR SHALL ENSURE
3.01 SAFETY FENCE - SAFETY FENCE WiLL BE INSTALLED AROUND THE
THAT TREES TO BE SAVED ARE FLAGGED ALONG THE LIMITS OF CLEARING AND PROTECTED.
PROPOSED SEDIMENT BASIN.
4, INSTALL THE PAVED CONSTRUCTION ENTRANCE WITH WASH RACK AS SHOWN ON THE PLANS. CONSTRUCTION
3.02 CONSTRUCTION ENTRANCE - ONE CONSTRUCTION ENTRANCE SHALL BE
ENTRANCE TO BE INSTALLED WHERE CONSTRUCTION VEHICLE ROUTES INTERSECT PAVED PUBLIC ROADS,
INSTALLED AT THE EXISTING DRIVEWAY ON DUNLORA DRIVE. THIS WILL BE THE
PROVISIONS SHALL BE MADE TO MINIMIZE THE TRANSPORT OF SEDIMENT BY (VEHICULAR) TRACKING ONTO
ONLY POINT OF INGRESS AND EGRESS TO THE SITE. CARE WILL BE TAKEN TO
THE PAVED SURFACE. WHERE SEDIMENT IS TRANSPORTED ONTO A PUBLIC ROAD SURFACE, THE ROAD SHALL
PROTECT ADJACENT ROADWAYS FROM TRANSFER OF SEDIMENT.
BE CLEANED THOROUGHLY AT THE END OF EACH DAY, SEDIMENT SHALL BE REMOVED FROM THE ROADS BY
SHOVELING OR SWEEPING AND TRANSPORTING TO A SEDIMENT CONTROL DISPOSAL AREA. STREET WASHING
3.05 SILT FENCE- SiLT FENCE WiLL BE PLAICED ON THE DOWNSTREAM SIDE OF
SHALL BE ALLOWED ONLY AFTER SEDIMENT IS REMOVED IN THIS MANNER. INSTALL THE WASH RACK UPHILL
DISTURBANCE WHERE NOTED ON THE PLANS.
FROM THE PROPOSED SEDIMENT BASIN. ACSA WILL DETERMINE THE APPROPRIATE METHOD OF SU PLYING THE
3.07 INLET PROTECTION - INLET PROTECTION SHALL BE INSTALLED ON EXISTING
WASH RACK. PARKING AND CONSTRUCTION ENTRANCE AREAS SHALL BE CLEARED OF ALL VEGETATION,
AND PROPOSED STRUCTURES WHERE INDICATED ON THE PLANS,
ROOTS, OR OTHER OBJECTIONABLE MATERIALS BEFORE CONSTRUCTION ROAD STABILIZATION IS INSTALLED,
3.09 TEMPORARY DIVERSION DiKE- DIVERSION DIKES WILL BE USED AROUND THE
5. CONTRACTOR DOES NOT HAVE PERMISSION TO CLEAR CUT THE SITE PRIOR TO INSTALLING THE PERIMETER
PERIMETER OF SITE DISTURBANCE WHERE SHOWN ON THE PLANS TO DIRECT
MEASURES AS SHOWN ON THE E&S PLAN. CONTRACTOR SHALL EXPEDITE INSTALLATION OF THE PERIMETER
EROSION AND SEDIMENT CONTROL MEASURES AND PROTECT THE SITE WITH THE LEAST AMOUNT OF TREE
RUNOFF TO ON-SITE SEDIMENT CONTROL FAiCILITIES.
REMOVAL NECESSARY TO INSTALL THESE MEASURES, INSTALL THE IN111IAL CONSTRUCTION MEASURES AS
3,13 TEMPORARY SEDIMENT TRAP- TEMPORARY SEDIMENT TRAPS WILL BE
SHOWN ON THE PHASE I EROSION CONTROL PLAN SHEETS. THIS INCLUDES THE SEDIMENT TRAPS, THE
INSTALLED WHERE SHOWN ON THE PLANS.
SEDIMENT BASIN, SILT FENCE, AND DIVERSION BERMS. STABILIZATION MEASURES SHALL BE APPLIED TO
3,14 TEMPORARY SEDIMENT BASIN- TEMPORARY SEDIMENT BASIN WILL BE
EARTHEN STRUCTURES SUCH AS DAMS, BERMS, AND DIVERSIONS IMMEDIATELY AFTER INSTALLATION.
INSTALLED WHERE SHOWN ON THE PLANS.
MEASURES INTENDED TO TRAP SEDIMENT SHALL BE CONSTRUCTED AS A FIRST STEP WITH ANY LAND
3.18 OUTLET PROTECTION- TO BE PROVIDED AT THE OUTFALL OF DRAINAGE
DISTURBANCE ACTIVITY AND SHALL BE MADE FUNCTIONAL BEFORE UPSLOPE LAND DISTURBANCE TAKES
PLACE.
PIPES WHERE SHOWN ON PLANS.
6• INSTALL ANY REMAINING EROSION CONTROL ITEMS AS SHOWN ON THE PHASE I EROSION CONTROL PLAN.
3.19 RIPRAP- RIPRAP SHALL BE INSTALLED( AS OUTLET PROTECTION WHERE
7. ONCE ALL THE EROSION CONTROL ITEMS HAVE BEEN INSTALLED AS SHOWN ON THE PHASE I EROSION
SHOWN ON THE PLANS.
CONTROL PLAN AND THE INSPECTOR HAS APPROVED THE EROSION CONTROL MEASURES, THE CONTRACTOR
3.31 TEMPORARY SEEDING- TEMPORARY SEEDING SHALL BE APPLIED WHERE
CAN BEGIN GRADING OPERATIONS.
SHOWN ON THE PLANS.
8. ROUGH GRADE THE SITE TO THE CONTOURS SHOWN ON THE PHASE 11 EROSION CONTROL PLAN AND INSTALL
THE PROPOSED STORM PIPE ADJACENT TO DUNLORA DRIVE WiTH INLET .AND OUTLET PROTECTION.
3.32 PERMANENT SEEDING- PERMANENTLY 'SEEDING SHALL BE APPLIED WHERE
9, PERMANENT OR TEMPORARY SOIL STABILIZATION SHALL BE APPLIED TO DENUDED AREAS WITHIN SEVEN DAYS
SHOWN ON THE PLANS.
AFTER FINAL GRADE 1S REACHED ON ANY PORTION OF THE SITE. TEMPORARY SOIL STABILIZATION SHALL BE
3.38 TREE PRESERVATION AND PROTECTION- TREE PRESERVATION FENCING
APPLIED WITHIN SEVEN DAYS TO DENUDED AREAS THAT MAY NOT BE AT FINAL GRADE BUT WILL REMAIN
SHALL BE INSTALLED WHERE SHOWN ON THE PLANS. NO TREES SHALL BE
DORMANT (UNDISTURBED) FOR LONGER THAN 30 DAYS. PERMANENT STABILIZATION SHALL BE APPLIED TO
HARMED OUTSIDE OF THE LIMITS OF TREE PROTECTION FENCING.
AREAS THAT ARE TO BE LEFT DORMANT FOR MORE THAN ONE YEAR,
3.39 DUST CONTROL- DUST CONTROL SHALL BE APPLIED THROUGHOUT THE SITE
10. INSTALL PHASE III CONTROLS INCLUDING THE SEDIMENT TRAP FOR THE WESTERN TOWNHOMES. INSTALL
STRUCTURES 34, 33, AND 32 AND THE TEMPORARY OUTFALL PiPE TO THE TRAP, GRADE TO FINAL
WHERE SHOWN ON THE PLANS.
CONTOURS AND INSTALL UTILITIES AND ROADWAYS PER THE APPROVED DUNLORA PARK ROAD PLANS.
11. ONCE THE SITE IS STABILIZED AND THE INSPECTOR HAS GIVEN APPROVAL, THE CONTRACTOR CAN CONVERT
STQjj MWAITER MANAGEMENT:
THE SEDIMENT BASIN INTO THE PERMANENT STORMWATER MANAGEMENT FACILITY. SEDIMENT TRAP 1 SHALL
STORMWATER RUNOFF QUANTITY WILL BE TREATED WITH ONE LEVEL II
BE REMOVED AND AN UNDERGROUND DETENTION SYSTEM, WITH BYPASS STORM SYSTEM SHALL BE INSTALLED.
BIORETENTION BASIN WITH DOWNSTREAM DETENTION. SEE STORMWATER
AT THiS TIME THE REMAINING PORTION OF THE STORM SEWER AND ALLEY WITH PARKING MAY BE INSTALLED.
MANAGEMENT PLAN SHEETS.
NO E&S ITEM SHALL BE REMOVED UNLESS THE UPSTREAM AREAS ARE STABILIZED AND THE INSPECTOR
GIVES PERMISSION,
MAIAIIE•NANCE.
12. MAINTAIN ALL EROSION CONTROL MEASURES AS SPECIFIED IN THE VIRGINIA EROSION AND SEDIMENT CONTROL
HANDBOOK, REMOVING ONLY WHEN APPROVED BY THE LOCAL PROGRAM ADMINISTRATOR IN ACCORDANCE
IN GENERAL, DURING CONSTRUCTION THE RLD OR CONTRACTOR ON-SITE WILL CHECK
THE VIRGINIA EROSION AND SEDIMENT CONTROL HANDBOOK.
ALL EROSION AND SEDIMENT CONTROL MEASURES DAILY AND AFTER EACHWITH
13, ALL TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES SHALL BE REMOVED WITHIN 30 DAYS AFTER
SIGNIFICANT RAINFALL. MONITORING REPORTS WILL BE REQUIRED FROM THE RLD IF
FiNAL SiTE STABILIZATION OR AFTER THE TEMPORARY MEASURES ARE NO LONGER NEEDED, UNLESS
NEEDED. SPECIFIC ATTENTION WILL BE GIVEN THE FOLLOWING ITEMS:
OTHERWISE AUTHORIZED BY THE LOCAL PROGRAM ADMINISTRATOR. TRAPPED SEDIMENT AND THE DISTURBED
.S D E BASINS P5 WILL BE CLEANED AND MAINTAINED IN ACCORDANCE
A
a E IM NT A INS AND TRASOIL
AREAS RESULTING FROM THE DISPOSITION OF TEMPORARY MEASURES SHALL BE PERMANENTLY
WITH A 0 &SEDIMENT CONTROL HANDBOOK.
VIRGIN( EROSION
STABILIZED TO PREVENT FURTHER EROSION AND SEDIMENTATION.
Ia.ALL INLET PROTECTION AND GRAVEL OUTLETS WILL BE CHECKED REGULARLY FOR
LE
G iS
CLOGGED BY SEDIMENT, THE GRAVEL WILL BE REMOVED AND CLEANED, OR iT WILL
BE REPLACED.' F"�
c. ALL SILT FENCE BARRIERS WILL BE CHECKED REGULARLY FOR UNDERMINING OR
DETERIORATION OF THE FABRIC AND REPAIRED AS REQUIRED. SEDIMENT SHALL' a MUM= I
I
BE REMOVED WHEN THE LEVEL OF SEDIMENT DEPOS TION REACHED HALF L WAY TO
THE TOP OF THE BARRIER.
w
d,ALL SEEDED AREAS WILL BE CHECKED REGULARLY TO SEE THAT A GOOD STAND ie 10..
IS MAINTAINED. AREAS SHOULD BE FERTILIZED AND RESEEDED AS NEEDED. - - IN CASE OF EMERGENCY, THE PRIMARY CONTACT FOR THE PROJECT WILL BE THE RLD
OR CONTRACTOR ON-SITE. THE CONTRACi 0R WILL BE DETERMINED AT THE 11ME THE
CONTRACT 1S AWARDED. IN ADDITION THE DEVELOPER MAY BE CONTACTED. UPON a woomx
COMPLETION OF THE PROJECT, THE OWNER WILL BE RESPONSIBLE FOR SITE
MAINTENANCE.
1. SET POSTS AND EXCAVATE A 4"X4"
7RENCH UPSLOPE ALONG THE LiNE
OF POSTS
;--.*o
FLOW
2. STAPLE WIRE FENCING TO THE POSTS.
SILT FENCE
SF (WITH WIRE SUPPORT)
0
NO SCALE
9 TEMPORARY 18" DIVERSION BERM
J. ATTACH THE FILTER FABRIC TO
THE WIRE FENCE AND EXTEND
IT INTO THE TRENCH.
4. BACKFILL AND COMPACT THE
EXCAVA7E'D SOIL.
EXTENSION OF FABRIC AND WIRE INTO 774E TRENCH.
SL
TABLE 3.31-8
ACCEP'T'ABLE TEMPORARY SEEDING PLANT MATERIALS
"QUICK REFERENCE FOR ALL REGIONS'
«.IF
Hate
Plaut uz Dates SRecies
lbs. acre
Sept, 1- Feb.. 15 50150 Mix of
Annual Ryegrass
(Lol um multi-florum)
a
50-100
Cereal (Winter) Rye
(&gale cereaie)
Feb. 16 - Apr. 30 Annual Ryegrass
60-100
LoliulSi mu1tA.UQMM}
May 1 - Aug 31 German Millet
50
tSetaria Italica}
Source: Va, DSWC
TOTAL LBS
GENERAL SLOPE Uj OR i E.SSlNJLACK
KENTUCKY 31 FESCUE 128 LBS.
REO TOP GRASS 2 LBS.
SEASONAL NURSE CROP 20 LBS.
SEASONAL NURSE CROP 150 LBS
FEBRUARY 16 THROUGH APRIL ANNUAL RYE
MAY 1 THROUGH AUGUST 15 FOXTAtL 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.
�)s PERMANENT SEEDING SCHEDULE
NO SCALE
(STD. & SPEC. 3.32 OF VIRGINIA EROSION &
SEDIMENT CONTROL HANDBOOK, 3RD ED.)
a
SILT FENCE DROP INLET
PROTECTION
2 X 4' VDBD FRAME DR!)v RiET
NTYH ORATE
T Po ME
GATHER
at CBRRtERS
V U
PERSPECTIVE VIEWS
STARE
FABRIC
ELEVATION OF STAKE AND
FADEIC ORIENTATION TION DETAIL A
SPECIFIC APPLICATION
THIS METHOD OF INLET PROTECTION IS APPLICABLE WHERE THE
INLET DRAINS A RELATIVELY FLAT AREA (SLOPE NO GREATER
THAN b%) -h-I THE INLET SHEET OR OVERLAND FLOWS (NOT
EXCEL'.. Y C-E'.S.) Aft£ TYPICAL. THE METHOD SHALT. NOT
APPLY TO INLETS RECEIVING CONCENTRATED FLOWS, SUCH AS
IN STREET OR HIGHWAY MEDIANS,
CURB INLET
p.+�.,
str;��► .r
WIRESCREE�N-�
GRA VEL *RL TER
OR #5 COARSE AGGREGA TE:
BLOCK & GRAVEL CURB INLET
IP 5EDIIMIENTFILTFR 3'07-g
NO SCALE
1992
38
Source.: Va T35wc
ALBEMARLE COUNTY
CONSTRUCTION ENTRANCE
OP.VtY{i ^.Wt6 PRECIS Rdk
W STD,lP,T EA9N
70' WAIN.
-u ASPR«S GF
a .� z>: ISHNC
PAVEMENT
• • ' �S'° 21A
DIVERSION DITCH "DE CLEVAT(ON AGu`REGAtE BASE
IXfSI1NO
GROUND
76' MIN.
Ex CURB OR
AST rsxm y„a EDGE OF PAYT
i
12' MIN. EXlSfINC
DIVERSION DROHM ''
MINIMUM W16TH AT/ Tl6WR
9ESIOH WATER
ELEVATION Is 4.0' PLAN VIEW
MUST EXTTdID ROLLIMM
OF
MGRM PND EGRESS OPERATION SET 1 11'2' WATER
HYDRANT i417H PROST
PROOF HYDRANT 3'
ROVE GRABS AND 4
OFF
EDGE of PAVEAiENT.
SECTION A -A
NM- A MINIMUM WATER TRIP OF i" I$ RECUR0
WHH A MMMUM WASH HOSE 01A, OF 1.5'
5 PAVW TEMP Ct7N5T EMIR
seas ATS E
9
C
;
DFNSTA"
��
8.1�CKYAEAtF�Ali47
LYNAA.tG7RS
I t°
SILTFENCE
0(WITHOUT WIRESUPPORT) a-Qs-�
0
ON SLOPES, STRIPS
N�7FCTIVE COVERINGS
T7fE SCOPE UE!} ACROSS BERM
WHERE THERE IS A BERM AT THE TOP OF THE SLOP
BRING
E B RRA OVER THE BERM AND ANCHOR
BEHIND
DINS �L4T70N NRSEBf?PE `.'.`:' SLOP
UNDER 4 AND STAPLE AT 12 INTERVALS.
IN Di11T11C�HHES, APPLY PROTECTIVE COVERING
USEACHECKOSLa7ES0RS REtmfR'FD (!D
JOINING MATERIAL IN 774 r�e�n >t
774E DITCH lF AT ALL POS (BLE
OPNGPLCPIRALLEL
.OND ANCHORR SECURELY W
SIM SOIL STABILIZATION BLANKET
TRE4TMENT2 SOH STABLITATM M44TrW AM7EML SWILL BE AV3TALLEO AS
NOSCALE REQUESTED BY 7W ALBEII4INE COUW FROSIOIAf COIIFIROL NVSPEL'W
Q
z
N
N Z
Lu
ce
I
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CONCRETE WASH
OUTAREA
NOTE: I LEGEND LEGEND
i. TOTAL LIMITS OF DISTURBANCE PROPOSED WITH THIS PLAN=7.og ACRES.umrrs OF LAND DISTURBANCE SAFETY FENCE PER VESCH 3. 01
2. THE LIMITS OF DISTURBANCE SHALL BE CONCURRENT WITH THE PROPOSED I I
I
WEDIMENT BASIN
3;n6
1 !
{
S..
l l l
04 R4`t CREST OFSTOW WEIR R°
f
3 {
i
j
elevation (ft).... area (sf
412.00
wet storage provided at this elevation (cy)
Mtti,i1SttiSi't�E,±tiA.Y CREST 4F• Elra£RGBNG'a'
2' WITHOUT SPILLWAY
,drainage area (acres)
431,00f t30 5 0
d
F
k Ar
`
�r
t �
i
i
1
{
i
i
!
upstream face slope:
2:1
f
r
83.5:
-
'''dry storage:
404.00
43T00' 1295 0,
i26.1
r MAX.
1
? f
f
179.7;
r CLOT"
a
408.00
wet sforage
487,8
" WET ° STORLAGE .
410.00
wet Storage required (cy) (67*DA)
84 3'
A�C2f9AiE
srs z a
412.00
w
�
collars:
wet storage provided at this elevation (cy),
{
;
Sf&Qi!�E?tl CLEA {S'W POINT
7,67
3;n6
1 !
{
S..
l l l
04 R4`t CREST OFSTOW WEIR R°
f
3 {
i
j
elevation (ft).... area (sf
412.00
wet storage provided at this elevation (cy)
Mtti,i1SttiSi't�E,±tiA.Y CREST 4F• Elra£RGBNG'a'
2' WITHOUT SPILLWAY
,drainage area (acres)
431,00f t30 5 0
d
F
k Ar
`
�r
t �
i
i
1
{
i
i
!
upstream face slope:
2:1
f
r
83.5:
-
'''dry storage:
404.00
43T00' 1295 0,
i26.1
r MAX.
1
? f
f
EXISTING MANAGED
r -STEEP SLOPES (TYP.)
Sediment Basin #1 Design
_., E (
trap wlurnes
S..
l l l
04 R4`t CREST OFSTOW WEIR R°
dewatering orifice elevation (ft)
-
elevation (ft).... area (sf
412.00
wet storage provided at this elevation (cy)
Mtti,i1SttiSi't�E,±tiA.Y CREST 4F• Elra£RGBNG'a'
2' WITHOUT SPILLWAY
,drainage area (acres)
431,00f t30 5 0
d
�y
11 id
k Ar
bottom of basin (ift)
432.00z 156-0'
...
3 7'
405.3
VAattJ,M
1251112'
434,00 524 O '
1
2701
upstream face slope:
2:1
402.00
436,001 1013,0!
83.5:
-
'''dry storage:
404.00
43T00' 1295 0,
i26.1
r MAX.
? rr
406.00
438 fit) 9603 0`°
179.7;
r CLOT"
a
408.00
wet sforage
487,8
" WET ° STORLAGE .
410.00
wet Storage required (cy) (67*DA)
84 3'
A�C2f9AiE
srs z a
412.00
bottom gaff strane weir (it)
1281.7
collars:
wet storage provided at this elevation (cy),
64.T$
;
Sf&Qi!�E?tl CLEA {S'W POINT
7,67
1 e of wet s ora Ed1rs
sop t ge s
2 1
slope of upstream face (Z:1)
2:1
tc (mitt)
10.8
slope of barrel (S'rb)
weir length (ft) (6xDA)
5.8
13.8
;t
lJ ry Stora �. 9 •....... ,. ,,,.',bottom
48,61
of trap elution
_ ...
number collars required
dry storage required (cy) (67*DA)
64 3t
t ttom trap dimensions
5x13 ;
4.4x4.4'
Brest 6i stone weir
437 [0
top of darn elevation (ft) �
438"
available tread (it
_..,.. _ .
dry stLarage p!gvaded at this elevation (cy) ,
64 7
.....:. ... _ .._._ .:... ..
tt�p width of darn (ft)
;
48
.
slope of dry storage sides
2 1 t'
,.top trap dimensions
32')66"
Sediment Basin #1 Design
355.8
design high orate}r (it)
411.00
dewatering orifice elevation (ft)
-
'top of dam (ft)
412.00
wet storage provided at this elevation (cy)
Mtti,i1SttiSi't�E,±tiA.Y CREST 4F• Elra£RGBNG'a'
2' WITHOUT SPILLWAY
,drainage area (acres)
&0
5.31
180.5
bottom of basin (ift)
basin volumes: (Lasing 2' contour intervals)
cleanout elevation (R)
405.3
DES1W HIGH WATER
has -Y sz� :a
1251112'
elevation (ft) contour area (sf)
volume (cy)
upstream face slope:
2:1
402.00
610.0
0
3:1
'''dry storage:
404.00
1617,0
79.5
T
? rr
406.00
2749.0
239.4
Lx3r ' s o+
n l µc
408.00
3998.0
487,8
" WET ° STORLAGE .
410.00
5349.0
832,8
2.88
diameter of flexible tubing (in) (orifice+2w)
412.00
6800.01
1281.7
f(
collars:
YES
runoff:
;
Sf&Qi!�E?tl CLEA {S'W POINT
7,67
C (use 0.45 for bare earth)
0.65
slope of upstream face (Z:1)
2:1
tc (mitt)
10.8
wet storage required (cy) (67*DA)
355.8
design high orate}r (it)
411.00
dewatering orifice elevation (ft)
406.9
'top of dam (ft)
412.00
wet storage provided at this elevation (cy)
355.8
top width of darn (if)
&0
:available volume before cleanout (cy) (min. 34*DA)
180.5
bottom of basin (ift)
402.00
cleanout elevation (R)
405.3
approx, bottom. dimensions:
1251112'
distance from cleanout to prince (ft) (> 1')
1.68
upstream face slope:
2:1
466.00; 327. Li ;
downstream facet slope:
3:1
'''dry storage:
A
...
46T00 519,0;15.5
;dry storage required (cy) (67"DA)
355.8
baffles.
NO
?principle spillway crest (ft)
409.67
length of flow, L (ft)
134
;dry storage provided at this elevation (cy)
420.0
effective width, VVe (ft)
46
diameter of dewatering orifice (in)
4.0
L ! We (baffles niot required it > 2)
2.88
diameter of flexible tubing (in) (orifice+2w)
6,0
{�crwSiT.e%i
f(
collars:
YES
runoff:
;
depth of water at spillway crest (It)
7,67
C (use 0.45 for bare earth)
0.65
slope of upstream face (Z:1)
2:1
tc (mitt)
10.8
slope of barrel (S'rb)
1,33YID
12yr 4.0 0 2yr
13.8
length of barrel in saturated gone (Ls)
48,61
125yr 6.0 Q 25yr
22.8
number collars required
2
:1:
dimension of collars
4.4x4.4'
principle spill) a�
r length .( (6xC3A)
0,6;:
available tread (it
1.00
emergency spillway:
YES
diameter riser (in)
48
required capacity, (025-Qp) (cis)
7.8
spillway capacity, Qp (cfs)
15.130
bottom width (ft)
33
diameter trash rack (in)
36
slope of exist channel (stiff)
33°1
barrel length (ft)
75
minimum length of exit channel (ft)
17
head on barrel through embankment (1)
10.67
crest of spillway (ft)
410.67
diameter of barrel (in)
15
U
SEDIMENT TRAP ##2
SCALE: 1"=20'
-(CI
!I
1
}
t
Sediment TraP2 design
Z
d
t
W
trap v iUCYte'S
ti
CREST Of ST"F WFJR
F
a
elevation. (ft) area (sf) ,
\to ume(cy)
466.00; 327. Li ;
z
„-„
A
...
46T00 519,0;15.5
OWSTORAGE
YARNEI4 '
d
468.00 73&0;KnIR
, .
WETSTOIAGE
f
yM
{�crwSiT.e%i
f(
�
;
vret storage
_.
E+ ......
13
CONCRETE WASH
OUT AREA
a..
k -b
FI��W
ION OF
1 -POTTY
0
k
¢
Sediment TraP2 design
Z
drainage area (acres)
W
trap v iUCYte'S
CREST Of ST"F WFJR
BtE'
a
elevation. (ft) area (sf) ,
\to ume(cy)
466.00; 327. Li ;
z
„-„
A
...
46T00 519,0;15.5
OWSTORAGE
YARNEI4 '
d
468.00 73&0;KnIR
, .
WETSTOIAGE
'
yM
{�crwSiT.e%i
CAM
�
vret storage
,.... .' . .
E+ ......
.. . - .. ,............
wet storage required (c) X67*QA) _
bottom of stogie weir (ft)
63
466.5
?5£E PIA'fE ;x.43 -R
CA�A"a�, fet?A7� „LASS T RPIiAP
vlt Mara a provided at this edewtion I
_ ..
7:6
p
Uj
1--
U
'C
sloe of wet storage sides
:1:
oo
Lu
r length .( (6xC3A)
0,6;:
i
s
drg_. store e:
y - ... ,
a
LLJ
Uj
bl ttorrl cis trap elevation (ft)
466 _.
dr sIpra e required c 67*ISA
67
bottom trap dimensichs:
crest.of stone.weir
4571-
(o of darn eievatio (ftp
466;
dr star e provided at this. elevation 1
7.7
tea vu'dtti of darn (ft)
C
U
slope of dry storage sides
21.
trap trap_0imensions
17'x48"
Yd D.
7po �1z
` 7DNNAL� w
W
Z
SHEET NO. a
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W
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9 LU
j LU
r ULU
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SHEET NO. a
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1119RMN11111
SHEET NO. a
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PRE -DEVELOPMENT SCENARIO (SC LE 0 111�=' 301) D.A.A' Pre -Development Impervious Areas (Water Quantity)
Existing Structures 5,328 sf
0
Existing Drive & Walkways 12,532 sf
Total = 17,860 sf
EX15TINGTREE LINE JYP.)
16 -13D.A.'A' Pre -Development Pervious Areas (Water Quantity)
Existing Woods 86,500 sf
MANAGED SLOPES
TH
SCOTT I.COLUNStZ
Lie. No. 035791�
Tc= 0.10 firs\ in. I
100' OF OLF w/ A ELE 16 C=
42' OF CF w/ A ELEV.r=10 <
"Y
y,l
V
Uj
AS,
1
4�s.
175
E
0 LU
-13 =09) S
POST -DEVELOPMENT SCENARIO & BEST MANAGEMENT PRACTICE PRESERVATION EASEME A 0 F , 11Tc= 0.18 hrs.
100' OF OLF w/ A ELEV.=3.5' (Tc=0.18 hrs.) &
STORMWATER MANAGEMENT NARRATIVE: 87' OF CF w/ A ELEV.=5'
THE PROPOSED PLAN PROVIDES STORMWATER TREATMENT FOR THE CONSTRUCTION OF
DUNLORA LOTS 1-42 (UNDER SEPARATE APPROVAL). THIS VSMP PLAN ADHERES TO PART 118 (Tc > 0.01 h rs.)
REQUIREMENTS FOR STORMWATER MANAGEMENT, THE SUBMITTAL PACKAGE DOCUMENTS
' @
ASSOCIATED WITH THIS PLAN SHOW WATER QUALITY COMPLIANCE BEING MET THROUGH 47�5OF CF 14 f t/s
THE BEST MANAGEMENT PRACTICE OF OPEN SPACE PRESERVATION, A LEVEL 11 BIOFILTER, oo
(T > �0.01 hrs,.)
AND PURCHASE OF o.59 LBjYR PHOSPHORUS WATER QUALITY CREDIT. THIS PLAN ALSO PROPOSED
COMPLIES WITH PART 1113 REQUIREMENTS BY THE ATTENUATION OF FLOWS IN A DETENTION
MANAGED SLOPES
PRESERVED SLOPESTH 0
.� ti
F/ STREAM BUFFER
T R.
r
77 FORESTJOPEN SPACE 0 SCOTT R. COUJNSZ0
L-) Lie. No. 035791�.
'Z_
I'd- i"Ilq /1'y -
'e j
Phase I Total Onsite Impervious Areas (Water Quality)
Roadway 29,600 sf
Sidewalks & Driveways 21,188 sf
Buildings 63,700 sf
Total = 114,488 sf
Phase 11 Total Onsite Impervious Areas (Water Quality)
Roadway 9,534 sf
Sidewalks & Driveways 5,964 sf
Buildings 10,995 sf
Total = 26,493 sf
New Proposed Total Parcel Onsite Impervious Areas (Water Quality)
Total= 140,981 sf
D.A. 'A' Post -Development Impervious Areas (Water Quantity)
DAW
2.77
1.15 cfs
I DA'B'
cfs
1
DA'B'
0.67
0.55 cfs
Remaining Post Development TP Load
4.12
I{Ib/yr)
Remaining TP Load Reduction (Ib/yr)
Required
Total=
5.04 a c.
5.04 ac.
DAW
2.77
1.15 cfs
I DA'B'
cfs
1
DA'B'
0.67
0.55 cfs
DAW
7.96
7,42 cfs
I DA'B'
cfs
1
DA'B'
2.34
2.24 cfs
Roadway 27,490 sf
Sidewalks & Driveways 18,927 sf
Buildings 46,850 sf
Total 93,267 sf
D.A.'B'Post-Development Impervious Areas (Water Quantity)
Roadway 11,948 sf
Sidewalks & Driveways 6,486 sf
Buildings 10,995 sf
Total 29,429 sf
Outflow Summary: (1 -Year Storm Event)
Pre -Development Post -Development
DA 'A' 1.57 0,70 cfs
Cfs
DAW 0.36 0.48 cfs
Total= 1.93 cfs 1.18 cfs
Outflow Summary: (2 -Year Storm Event)
Pre -Development Post- Development
Total= 3.44 cfs 1.70 cfs
Outflow Summary: (10 -Year Storm Event)
Pre -Development Post -Development
Total= 10.30 cfs 9.66 cfs
Watershed Summary
Pre -Development Post -Development
7
DAA
I
3.99 ac.
3.99 ac.
I DA'B'
1.05 ac.
1.5 ac.
-
y
Total TP Load Re I duction R . equired 5.52 U R SECTI N 30.7.4(b)h (TYPICAL)
(IbIvr)
Site Compliance Summary
Total Runoff Volume Reduction utl
6,978
Total TP Load Reduction Achieved
4.93
(lb/yr)
Total TN Load Reduction Achieved
36,03fib!yrl
17-1
Remaining Post Development TP Load
4.12
I{Ib/yr)
Remaining TP Load Reduction (Ib/yr)
Required
GRAPHIC SCALE
15 30 60
IN FEET
I inch = 30 ft.
PROPOSED STREAM7'
BUFFER (TYP.)
120
PROPOSED OPEN SPACE
PRESERVATION EASEMENT
COINCIDES WITH PROPERTY LINE
STORMWATER MANAGEMENT FACILITY'A' DETAIL (SCALE OF 1"=30')
/f
i
i
'1
1
I�- - ,, ! ; , J)
_.
.
l _.... a
_,...I.' DF�ER FLREBAY Wjz:� , ,
/
,
,
...
1
SIDE SOPS
. .r E 4 %o
ri
,
. '('
i
J
.i
1
I � � I (
r �
1
6" SCHEDULE 4a PERFORATED PVC F �,tf,ltll t 1 VVIDyE PORI.EBAY `TOP OF DAM ", ;
} + UNDERDRAINS 20' MAXIMUM SPACING ,ELEV. V.. yzy.oa' W(20' \+VIDE �0RE6 i
� . I'll. --, 44 1 % I i'' I SPILLWAY CREST PLEA.=' 2 ao'. t 1
WITH CLEANOUTS, SHALL BE INSTALLED ; ,, $. , �`,
}' : THROUGHOUTTHE BIOFILTER IN THE -' ( �� '�
LOWER STONE LAYER. UNDERDRAINS i ,E _
l `
ya. 2 SHALL BE SLOPED TO DRAIN TO THE RISER - S, 1 . i
`
STRUCTURE OR TO DAYLIGHT INTO THE { i
1. i i i i ,/
DETENTION CELL & SHALL HAVE A'12" i' '
i.
STONE SUMP LOCATED BELOW THE INVERT / f ra z I' '' r Ik ,i,: •- t �
OFTHE UNDERDRAINS. PV sf) t EEL l9 B FILTER CELIs
L1.5�, .,o � , , , I � SU(2FACEI LEVI.=. 22:ao'I. `I I:
#1 -
_.
__.. S
- I1..
(31 ;II1MI , j . I [ 1 i
i �j #
za` WIDE tRMQRET� SPILLWAY CREST �' t
11,;1
i
r i - S
r
- "ABOVE -�_
STI
S12
L-E�I.-
2 .aa' CR �
E - -
f 7 ,•A t
T J J )
r
-= i I
:-e y ,
_ - TiNGA ,�..,
C EA �..:II
BIOFfLTERTOP.LAYER, Rr:, }
'7 C i l
r i
._.. OF1a __,,. � , ,
ING DEPTH r
.-_ MAXIMUM POND _ ;,r, � ,
,r J , ._? t I
.: i i '
2 .aa ,,.ii„: ( i t
TOP OF DAM ELEV r S' 4
{ 4 i r:;� 7
_ f I t1
_- A
1. i
/:
f s ..--'---'� - III' + i , I 4
i �;
r i
,i.
k,
i i'
r.:
11 �'.. !a 1:.'sf i i i
}
PROPOS D 6 MAX HT. WALL... / % r _, ,...
�. r f / , ,
W1 "f
j
NDRA
IL II i
illjHfl 1 =, F -1 , r
\,
:
r- j
i
-.�
h
`'. _'.1" _ ..- ,,:,' ''' ,, `" ��,. � _....--�-�--. r. PROPOSED Ot,B" CL. I11 RCP
i
- � 5 MCLS . I t STANDPIPEwITRASHRACKS
Y_..11
,_ SHALL SERVE AS THE RISER
,_
10._ 0s
I
�-r t
-.. ? _... ..- � \� �, ��_ �� _....- .. , STRUCTURE.
<('- �7ti __ 1 RISER STRUCTURE RIM= a .
�a _
_ -
SEVEN O MID -FLOW
_ V
_.,..: { )
_ 7 3
---'----�,� ORIFICES- a8.6
_..
;.. .e s, TWO{2} rIJ2.5 LOW -FLOW
:� - -..,. ... ORIFI ES = o2.oa`
R C y
.., ... ...._-._..__. -'-. a-.: /
I-,,
_.
__... !
, ;
i
i
t 7`' i
i
-�
\` r
t
f -. . - ' f
\ _ ^-- 1' I`+'( / it
y
-'- _:_,._..;:. ................. I _____ T1`'r r- (r ! 1
;-
OPOSEQ i?ETENTION. CELL E I i I=� I (_ I I i- -11 I I- / j 1
PR
_.
- -< i --
, / t i 1
..._: ;�� I�' 111 it--�� u
«�-11 11", . -. --_ - ��
- --
. . . . +- - - -- f
�.?� �,
1.
�a --_ --i
I I'' -f I I I I I I- i i
. ..
Ill
r,
"PR PO5ED WIDE GRAS5 LINED
\. 33 -.._..... .._ ..
. EMERGENCYSMLLWAYWjSA-S DE .1. .
, SLOPES CREST ELEVATI Nr ,4 :6
7 _.
t,
%, , {8''TOR-OF L7Aivt ELEV='ral2.oa') :--.: . .
. . - .
_. . . :
ar . - ...._...._ f t ... t_.. _._. _ .
.. j _..... ,i
PROPOSED r1J� - ,CL. III RCP
`,c__ a ,i . _� I I . BARREL-(.7.5LF, S=x.33%;- ,
I .r v .._...IN�- -
i 01
-
__.
'\1-1
INV. OUT= oosa:.1.
Et
)- .
1'1. i
�..
1. Ii
:- _
.
we
i
,. p, _. J 4`. . " .
v' �,.
._" .
�,
-� �i � {
.
��
- ,, /
_
'/'-
PROPOSED VDOT EC -1 CLASS Al _'' ■„� 1-� . . . .
OUTLET PROTECTION w/ GEOTEXTILE :
-...-
FILTER FABRIC UNDERLAYMENT (L=8', � rrr. _'
W1=4.5`, WZ=9.5'; D=1.4' MIN.}
�:-;. .
„�
BASIN NOTES:
1, STATE APPROVED TRASH RACKS SHALL BE INSTALLED ON ALL ORIFICE OPENINGS.
2, A CONCRETE FOUNDATION SHALL BE INSTALLED ON THE RISER AS SHOWN & MEETING THE MINIMUM SPECIFICATIONS SET FORTH IN THE VESCH SPEC. #3.'1 .
3. CONTRACTOR AND CONSTRUCTION SHALL ADHERE TO ALL OSHA REQUIREMENTS. ADDITIONALLY, SPECIAL ATTENTION SHALL BE GIVEN TO THE CONSTRUCTION
SHORING ASSOCIATED WITH THE BIORETENTION BASIN EXCAVATION.
435
-
- I ,��
----
,
-
WIDE 1
--- -
-OREBAY TOP OF 4AM
--
-
I-------
I
I
3,869 sf
STORMWATER MANAGEMENT FACILITY GRADING
435
426
717
693
428
1,845
:e
430
3,096
8,055
410
4,450
15,560
412
5,906
1 25,882
66
--
e_______________
-----
--
��
ELEV_=424.00`
-FORE
_ jao' WID
XYSPILL -AY CREST
ELEV:
----
- --
--- ---
--------
--- --
__ --I
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BIORETENTION BASIN CONSTRUCTION NOTES:
FACILITY PLANTING SPECIFICATIONS:
1, ROOTSTOCK OF THE PLANT MATERIAL SHALL BE KEPT MOIST DURING TRANSPORT FROM THE SOURCE TO THE JOB SITEAND UNTIL PLANTED.
2. WALLS OF PLANTING FIT SHALL BE DUG SO THAT THEY ARE VERTICAL.
M
3. THE DIAMETER OF THE PLANTING PIT MUST BE A MI NIMUM OF SIX INCHES 6" LARGER THAN THE DIAMETER OF THE BALL OF THE TREE.
4. THE PLANTING PIT SHALL BE DEEP ENOUGH TO ALLOW 1/8 OF THE OVERALL DIMENSION OFTHE ROOT BALL TO BE ABOVE GRADE. LOOSE SOIL ATTHE BOTTOM OF
THE PIT SHALL BE TAMPED BY HAND.
5. THE APPROPRIATE AMOUNT OF FERTILIZER IS TO BE PLACE AT THE BOTTOM OF THE PIT(SEE BELOW FOR FERTILIZATION RATES).
6, THE PLANT SHALL BE REMOVED FROM THE CONTAINER AND PLACED IN THE PLANTING PIT BY LIFTING AND CARRYING THE PLANT BY ITS BALL (NEVER LIFT BY
BRANCHES OR TRUNK).
7. SETTHE PLANT STRAIGHTAND IN THE CENTER OF THE PIT SO THAT APPROXIMATELY 1/8 OF THE DIAMETER OF THE ROOT BALL iS ABOVE THE FINAL GRADE.
8. BACKFILL PLANTING PIT WITH EXISTING SOIL.
9. MAKE SURE PLANT REMAINS STRAIGHT DURING BACKFILLING PROCEDURE.
10. NEVER COVER THE TOP OF THE BALLWITHSOILMOUNT SOIL AROUND THE EXPOSEDBALL.
11. TREESSHALL BE BRACED BY USING 2' BY 2' WHITE OAK STAKES, STAKES SHALL BE PLACED PARALLEL TO WALKWAYS AND BUILDINGS. STAKES ARE TO BE EQUALLY
SPACED ON THE OUTSIDE OFTHE TREE BALL. UTILIZING HOSE AND WIRE THE TREE ISTO BE BRACED BYTHESTAKES.
12. BECAUSE OF THE HIGH LEVELS OF NUTRIENTS IN STORMWATER RUNOFFTO BETREATED, BIORETENTION BASIN PLANTS SHOULD NOT REQUIRE CHEMICAL
FERTILIZATION.
'ONTRACTOR REQUIREMENTS: (SEEPLANTSCHF,OULEFOR SPECIHCPLANTSPECIES)
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 (COPIESARE AVAILABLE FORA FEE FROM THE VIRGINIA CHAPTER OF THE AMERICAN SOCIETY OF LANDSCAPE ARCHITECTS, VIRGINIA NURSERYMEN'S
ASSOCIATION, INC. ANDTHE VIRGINIA SOCIETY OF LANDSCAPE DESIGNERS),
3. ALL PLANT MATERIAL SHALL MEETTHE MINIMUM SPECIFICATIONS AND STANDARDS DESCRIBED IN THE CURRENT ISSUE OF THE AMERICAN STANDARD FOR NURSERY
STOCK, PUBLISHED BYTHE 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 ANYVARIANCE FROMTHE 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.
DAMAGE T BUDS BRANCHES STEMS OR OVERALL SHAPE OF THE
8. PLANTS WILL BE PREPARED FOR SILL PMENT IN A MANNER THAT WILL NOT CAUSE AMA 0 HE BARK, , VERA
G S WILL OTTHE CONTAINERS STOCK. CONTAINER GROWN PLANT I LBETRANSP R ED IN EIN WHICH THEY HAVE BEEN GROWN.
9. ALL PLANT MATERIAL, UNLESS OTHERWISE SPECIFIED, SHALL BE UNIFORMLY BRANCHED AND HAVE A VIGOROUS ROOT SYSTEM. PLANT iMATERIAL SHALL BE HEALTHY,
AND FORINFESTATION. ALL PLANT MATERIAL SH L BE FRESH FREE FROM
VIGOROUS, AND FREE FROM DEFECTS DECAY DISEASES INSECT PEST EGGS A ALL MS OF SHALL ,
TSHOCK OR VISIBLE WILT PLANTS DEEMED UNHEALTHY WILL BE REJECTED.
TRANSPLANT
10. ALL CONTAINER STOCK SHALL HAVE BEEN PROPAGATED INA CONTAINER LONG ENOUGH FOR THE ROOT SYSTEM TO 14AVE DEVELOPED SUFFICIENTLY TO HOLD ITS
SOIL. CONTAINER STOCK WITH POORLY DEVELOPED ROOT SYSTEMS WILL NOT BEACCEPTED.
O T VA O STORED DPROTECT D Y THE CONTAINER, OUTSIDE STORAGE ARIEASWILL BESHADED AND
11. PLANTS NOT INSTALLED N HE DAY OF ARRIVAL N SITE SHALL BE ❑RE AN E B
PROTECTED FROM THE WIND AND SUN. PLANTS STORED ON SITE SHALL BE PROTECTED FROM ANY DRYING AT ALL TIMES BY COVERING THE BALLS ORROOTSWITH
MOIST SAWDUST, WET BURLAP, WOOD CHIPS, SHREDDED BARK, PEAT MOSS, OR OTHER SIMILAR MULCHING MATERIAL.
12. THE OWNER RESERVESTHE RIGHTTO SUBSTITUTE PLANT MATERIAL TYPE, SIZE AND/OR QUANTITY. ANY SUBSTITUTIONS MUST BE APPROVED BYTHE DESIGNER.
Y N (EX: MAJOR ADJUSTMENTS MUST BE APPROVED BY
13. MINOR FIELDADIUSTMENTSMA BE ECESSARYDUETOSTECONDITIONS{EX )
THE DESIGNER.
14. NO PLANTING SHALL OCCUR WHEN THESOIL IS FROZEN.
15. PLANT MATERIAL SHALL DE PLACED IN EXISTING SOIL WITH EACH PLANTING PlT EXCAVATEDTO A SIZE SUFFICIENT TOCONTAIN THE ENTIRE R00
BALL OR ROOT
MASS, WITHOUT CRAMPING ROOTSTOCK.
16. THE CONTRACTOR SHALL MAINTAIN A ONE (1) CALENDAR YEAR 9G% CARE AND REPLACEMENT WARRANTY FOR ALL PLANTINGS. THE PERIOD OF CARE AND
REPLACEMENT SHALL BEGIN AFTR 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 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.
19, THE CONTRACTOR SHALL CONTACTTHE WATER RESOURCES INSPECTOR AND COLLINS ENGINEERING 24 HOURS PRIOR TO BACKFILLING THE BIOFILTERS AND REQUEST
AN INSPECTION AND APPROVAL OF THE UNDERDRAINS INSTALLATION AND THE SOIL MIX.
20. THE BIOFILTER PLANTING AREAS SHALL BE COVERED WITH HEAVY STRAW MULCH TO A DEPTH OF 3" IMMEDIATELY AFTER PLANTING.
FACILITY CONSTRUCTION
1. BIORETENTION AREASSHALL BE FULLY PROTECTED BY SILT FENCE OR CONSTRUCTION FENCING, PARTICULARLY IFTHEY WILL RELY ON INFILTRATION,
IDEALLY, BIORETENTION SHALL REMAIN OUTSIDETHE LIMITOF DISTURBANCE DURING CONSTRUCTION TO PREVENT SOILCOMPA(CTION BY HEAVY
EQUIPMENT. BIORETENTION BASIN LOCATIONS MAY BE USED AS SMALL SEDIMENTTRAPS OR BASINS DURING CONSTRUCTION. HOWEVER, THESE MUST BE
ACCOMPANIED BY NOTES AND GRAPHIC DETAILS ON THE E&S PLAN SPECIFYING THAT:
A. THE MAXIMUM EXCAVATION DEPTH ATTHE CONSTRUCTION STAGE MUST BEAT LEAST i. FOOT ABOVE THE POST CONSTRUCTIRON INSTALLATION, AND
B. THE FACILITY MUSTCONTAIN AN UNDERDRAIN. THE PLAN MUSTALSO SHOW THE PROPER PROCEDURES FOR CONVERTING THE TEMPORARY SEDIMENT
CONTROL PRACTICE TO A PERMANENT BIORETENTION FACILITY, INCLUDING DEWATERING, CLEANOUT AND STABILIZATION.
2. CONSTRUCTION OF THE BIORETENTION AREA MAY ONLY BEGIN AFTER THE ENTIRE CONTRIBUTING DRAINAGE AREA HAS BEEN STABILIZED WITH VEGETATION.
IT MAYBE NECESSARYTO BLOCK CERTAIN CURB OR OTHER INLETS WHILE THE BIORETENTION AREA IS BEING CONSTRUCTED. THE PROPOSED SITE SHALL BE
CHECKED FOR EXISTING UTILITIES PRIOR TO ANY EXCAVATION.
3. THE DESIGNER AND THE INSTALLER SHALL HAVE A PRE -CONSTRUCTION MEETING, CHECKING THE BOUNDARIES OF THE CONTRIBUTING DRAINAGE AREA AND
THE ACTUAL INLET ELEVATIONS TO ENSURETHEY CONFORM TOTHE ORIGINALDESIGN.BECAUSETHETIMINGOFTHEINSTALLATIONISDICTATEDBYTHE
CONTRACTOR SCONTACTINGT INCE OT ER CONTRACTORSMAYB
CONTRACTOR THE CONTRA ALL BE RESPONSIBLE FOR HE ENGINEER. S H E RESPONSIBLE FOR
CONSTRUCTING PORTIOS0FTHESITE IT IS QUITE TE COMMON TO FINDSUBTLEDIFFERENCE5 IN SITE GRADING DRAINAGE AND PAVING ELEVATIONSTHAT
CAN PRODUCE HYDRAULICALLY IMPORTANT DIFFERENCES FORTHE PROPOSED BIO RETENTION. THE GENERAL CONTRACTOR SHALL CLEARLY COMMUNICATE,
IN WRITING, ANY PROJECT CHANGES DETERMINED DURING THE PRE-CONSTRUCTIO N MEETING TO THE INSTALLER AND THE PLAN 9REVIEWjI NSPECTION
AUTHORITY.
4, TEMPORARYE&S CONTROLS ARE NEEDED DURING CONSTRUCTION OFTHE 810 RETENTION AREATO DIVERTSTORMWATER AWAY FROM THE BIO RETENTION
AREA UNTIL IT IS COMPLETED. SPECIAL PROTECTION MEASURES SUCH AS EROSION CONTROL FABRICS MAYBE NEEDED TO PROTECT VULNERABLE SIDE
SLOPES FROM EROSION DURING THE CONSTRUCTION PROCESS.
1. ANY PRE-TREATMENTCELLS SHALL BE EXCAVATED FIRST AND THEN SEALED TO TRAP SEDIMENTS.
2. EXCAVATORS OR BACKHOES SHALL WORK FROM THE SIDES TO EXCAVATE THE B10 RETENTION AREA TO ITS APPROPRIATE DESIGN DEPTH AND DIMENSIONS.
EXCAVATING EQUIPMENT SHALL HAVE SCOOPS WITH ADEQUATE REACH SO THEY DO NOT HAVETO SIT INSIDE THE FOOTPRINT OF THE BIORETENTION AREA.
CONTRACTORS SHALL USE ACELL CONSTRUCTION APPROACH IN LARGER BIORETENTION BASINS, WHEREBY THE BASIN IS SPLIT INTO Soo TO 1, 00o SO. FT.
TEMPORARY CELLS WITH A io-15 FOOT EARTH BRIDGE IN BETWEEN, SO THAT CELLS CAN BE EXCAVATED FROM THE SIDE.
3. IT MAYBE NECESSARY TO RIP THE BOTTOM SOILS TO A DEPTH OF 6 TO i2 INCHES TO PROMOTE GREATER INFILTRATION. THIS REQIUIREMENT WILL BE
DICTATED BYTHE INSPECTOR, PRIOR TO INSTALLATION OF THE REMAINDER OF THE FACILITY.
SIDES. IF E
ARE WITH A6•INCH OVERLAP ON THE ,GE LAYER WILL BE USED
4. PLACE GEOT£XTILE FABRIC ON THE SIDES OF THE BIORETENTION A ,
PLACE THE APPROPRIATED EPTH OF #S7 STONE ON THE BOTTOM, INSTALL THE PERFORATED UNDERDRAIN PIPE, PACK #57 STONE: TO 3 INCHES ABOVE THE
UNDERDRAIN PIPE, AND ADD APPROXIMATELY 3 INCHES OF CHOKER STONEIPEA GRAVEL ASA FILTER BETWEEN THE UNDERDRAINI AND THE SOIL MEDIA
LAYER. IF NO STONE STORAGE LAYER IS USED, STARTWITH 6 INCHES OF #57 STONE ON THE BOTTOM, AND PROCEED WITH THE LAYERING AS DESCRIBED
ABOVE.
5. DELIVER THE SOIL MEDIA FROM AN APPROVED VENDOR, AND STORE IT ON AN ADJACENT IMPERVIOUS AREA OR PLASTIC SHEETIMG. APPLY THE MEDIA IN
i2 -INCH LIFTS UNTIL THE DESIRED TOP ELEVATION OF THE BIORETENTION AREA IS ACHIEVED. WAIT FEW DAYS TO CHECK FOR SE=TTLEMENT, AND ADD
ADDITIONAL MEDIA, AS NEEDED, TO ACHIEVE THE DESIGN ELEVATION.
6. PREPARE PLANTING HOLES FOR ANY TREES AND SHRUBS, INSTALLTHE VEGETATION, AND WATER ACCORDINGLY. INSTALL ANY TEMPORARY IRRIGATION.
7. PLACE THE SURFACE COVER IN BOTH CELLS (MULCH, RIVER STONE OR TURF), DEPENDING ON THE DESIGN. IF COIR OR JUTE MATTIiNG WILL BE USED IN LIEU OF
MULCH, THE MATTING WILL NEED TO BE INSTALLED PRIOR TO PLANTING (STEP 9), AND HOLES OR SLITS WILL HAVE TO BE CUT INiTHE MATTING TO INSTALL
THEPLANTS.
8. INSTALLTHE PLANT MATERIALS AS SHOWN IN THE LANDSCAPING PLAN, AND WATER THEM DURING WEEKS OF NO RAIN FORTHE [FIRST TWO MONTHS.
9. CONDUCT THE FINAL CONSTRUCTION INSPECTION (SEE SECTION 9.2). THEN LOG THE GPS COORDINATES FOR EACH BIORETENTION FACILITY AND SUBMIT
THEM FOR ENTRY INTO THE LOCAL MAINTENANCE TRACKING DATABASE.
FACILITY MAINTENANCE:
THE FOLLOWING TASKS SHALL BE PERFORMED BYTHE CONTRACTOR IN THE FIRSTYEAR FOLLOWING INSTALLATION:
1. FOR THE FIRST 6 MONTHS FO LLOWI NG CONSTRUCTION, THE SITE SHALL BE I NSP ECTED BY THE CONTRACTOR AT LEASTTWICE AFTER S-TORM EVENTS THAT EXCEED
ij2 INCH OF RAINFALL.
2. THE CONTRACTOR SHALL LOOK FOR BARE OR ERODING AREAS IN THE CONTRIBUTING DRAINAGE AREA OR AROUND THE BIORETENTION AREA, AND MAKE SURE
THEY ARE IMMEDIATELY STABILIZED WITH GRASS COVER. CONTRACTOR SHALL SPOT RESEED AS NECESSARY.
3. ONE-TIME SPOT FERTILIZATION MAYBE NEEDED FOR INITIAL PLANTINGS.
4. WATERING IS NEEDED ONCE A WEEK DURING THE FIRST 2 MONTHS, AND THEN AS NEEDED DURING THE FIRSTGROWNG SEASON (APRIL -OCTOBER), DEPENDING ON
RAINFALL.
5. REMOVE AND REPLACE DEAD PLANTS. SINCE UP TO so% OF THE PLANT STOCK MAY DIE OFF IN THE FIRST YEAR, THE CONTRACTOR SHAILL BE RESPONSIBLE FORTHE
CARE AND REPLACEMENT WARRANTY TO ENSURE THAT VEGETATION IS PROPERLY ESTABLISHED AND SURVIVES DURING THE FIRST GRIOWING SEASON FOLLOWING
CONSTRUCTION, THE TYPICALTHRESHOLDS BELOW WHICH REPLACEMENT IS REQUIRED ARE 85% SURVIVAL OF PLANT MATERIAL AND noo%SURVIVAL OF TREES.
6. A SPRING MAINTENANCE INSPECTION AND CLEANUP SHALL BE CONDUCTED AT EACH BIORETENTION AREA. THE FOLLOWING IS A LIST (DF SOME OF THE KEY
MAINTENANCE PROBLEMS TO LOOK FOR:
A. CHECK TO SEE IF 75%TO go%COVER (MULCH PLUS VEGETATIVE COVER) HAS BEEN ACHIEVED IN THE BED, AND MEASURE THE DEPTH OF THE REMAINING
MULCH.
B. CHECK FOR SEDIMENT BUILDUP AT CURB CUTS, GRAVEL DIAPHRAGMS OR PAVEMENT EDGES THAT PREVENTS FLOW FROM GETTING INTO THE BED, AND CHECK
FOR OTHER SIGNS OF BYPASSING.
C. CHECK FORANYWINTER-OR SALT -KILLED VEGETATION, AND REPLACE ITWITH HARDIER SPECIES.
D. NOTE PRESENCE OF ACCUMULATED SAND, SEDIMENT AND TRASH IN THE PRE-TREATMENT CELL OR FILTER BEDS, AND REMOVE IT.
E. INSPECT BIORETENTION SIDE SLOPES AND GRASS FILTER STRIPS FOR EVIDENCE OF ANY RILL OR GULLY EROSION, AND REPAIR IT.
F. CHECK THE BIORETENTION BED FOR EVIDENCE OF MULCH FLOTATION, EXCESSIVE PONDING, DEAD PLANTS OR CONCENTRATED FLOWS, AND TAKE
APPROPRIATE REMEDIAL ACTION.
G. CHECK INFLOW POINTS FOR CLOGGING, AND REMOVE ANY SEDIMENT,
H. LOOK FOR ANY BARE SOIL OR SEDIMENTSOURCES IN THE CONTRIBUTING DRAINAGE AREA, AND STABILIZETHEM IMMEDIATELY.
I. CHECK FOR CLOGGED OR SLOW -DRAINING SOIL MEDIA, A CRUST FORMED ON THE TOP LAYER, INAPPROPRIATE SOIL MEDIA, OR OTHER CAUSES OF
INSUFFICIENT FILTERING TIME, AND RESTORE PROPER FILTRATION CHARACTERISTICS.
7. FOR A LIST OF THH, OWNER'S ANNUAL LONG-TERM MAINTENANCE ACTIVITIES AFTER THE CONTRACTOR's RESPONSIBILITIE'',S HAVE BEEN COMPLETED,
PLEASE SEE BELOW.
1.
Annual MSirrtenance ActrIiitaies for Braxretention
t1'i�.. Flo~"
• IMowing gat grass fitter strips and bivr>W tendon turf cover At mast 4 times a ;tear
• ':Spilt weer#in , erQsloT, rgva6, trash 1erriovali and Tau G. r .. ing Twice I UIVinrg 9 OWiaig season
• Add elPfilree ,nest plan ing to maintain dc,sired ttie vegetation
. density As Tt�ded
R�. *vb invasive plants using rewru hien Ied control rnetbuds
* Stabiliza the co,ntri1puting drainage arwi tel -prevent erosion
► .Spring Inspection and cleanup
i Sp pteiriont hititch to rnainiath a 3 Incta layer Annd$Ily
s Prune trees and shrubs
- ke,i) aove?sedooiit In pre-treatment cells andinflow inns Once every, 2 to 3:ybars:.
r IReplace, the € inch to erEvr ry 3'years'
FACILITY INSPECTION:
CONSTRUCTION INSPECTIONS ARE CRITICALTO ENSURETHE BIORETENTION BASINS ARE PROPERLY CONSTRUCTED AND ESTABLISHED. BECAUSE THE TIMING OF THE
NSTALLATION IS DICTATED BY THECONTRACTOR, THE CONTRACTOR SHALL BE RESPONSIBLE FOR CONTACTING THE ENGINEER AND INSPIECTOR PRIOR TO
INSTALLATION. MULTIPLE SITE VISITS AND INSPECTIONS ARE REQUIRED TO BE SCHEDULED BYTHE CONTRACTOR, WITH THE ENGINEER AND INSPECTOR, DURING THE
FOLLOWING STAGES OF THE BIOFILTER CONSTRUCTION PROCESS:
J. PRE -CONSTRUCTION MEETING
2. INITIAL SITE PREPARATION (INCLUDING INSTALLATION OF PROJECT E&S CONTROLS)
3. EXCAVATIONIGRADING (E.G., INTERIMJFINAL ELEVATIONS)
4. BIOFILTER INSTALLATION (E.G., MICROTOPOGRAPHY, SOIL AMENDMENTS, STONE BEDDING, UNDERDRAINSAND STAKING OF PLANTING ZONES)
5. PLANTING PHASE(WITH AN EXPERIENCED LANDSCAPE ARCHITECT PRESENT)
6. FINAL INSPECFION (DEVELOP A PUNCH LIST FOR FACILITY ACCEPTANCE)
PLEASE ALSOSEE ABOVE, UNDER FACILITY MAINTENANCE #6, FOR REQUIRED INSPECTIONS.
EMBANKMENT NOTES:
THE EMBANKMENT 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
& THE REMAINING DISTURBED SLOPES SHALL BE STABILIZED WITH EC -2 MATTING. ALL BERM FILL MATERIAL
SHALL CONSIST OF ML, CL, SC OR GC SOILS & BE FREE OF WOOD, ROUTS, ROCKS OR ANY OTHER NON
COMPACTING SOIL. COMPACTED FILL SHALL BE PROCTOR MAXIMUM DRY DENSITY ASTM D698 AND HAVE A
Mi NIMUM OF 95% OF MAXIMUM DRY DENSITY AND 2% OF OPTIMUM MOISTURE CONTENT. ALL FiLL
MATERIAL AND CONSTRUCTION SHALL BE APPROVED BY AN ONSITE GEOTECHNICAL ENGINEER PRESENT
DURING THE CONSTRUCTION OF THE EMBANKMENTS AND FILL AREAS.
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BIORETENTION BASIN'A' (LEVEL II) DESIGN & REQUIREMENTS:
Treatment Volume (Per VRRM Calculations)
8,723 cf
Minimum Treatment Volume Required
10,9014 cf
Minimum Forebay Volume Required (15% of TV)
1,636 cf
Forebay Volume Provided
1,685 Cf
Minimum Surface Area Required (Tv/Storage De
3,753 sf
Surface Area Provided
3,869 sf
STORMWATER MANAGEMENT FACILITY GRADING
1,685
Elevatio
Area of
COMMON NAME
n
Forebay Cell
Volume
(ft)
Contours (sf)
(cf)
422
578
0
424
1,138
1,685
426
717
693
428
1,845
3,167
430
3,096
8,055
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<- 6' Mix at 25% porosity; 3" pea gravel ,at 2%
porosity,
12" stone at 4011 porosity & 12" of panding at
Elevatio
Area of
COMMON NAME
Elevatio
Detention
Volume
n
Cell
Volume
(ft)
Contours (sf)
(cf)
402
81
0
404
717
693
406
1,845
3,167
4018
3,096
8,055
410
4,450
15,560
412
5,906
1 25,882
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<- 6' Mix at 25% porosity; 3" pea gravel ,at 2%
porosity,
12" stone at 4011 porosity & 12" of panding at
Elevatio
Area of Filter
COMMON NAME
n
Cell Contours
Volume
(ft)
(sf)
(Cf)
422
3,869
0
424
4,906
8,755
426
14. f'
I 40 2(1
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I -_
t D GROUND DETENTION SYSTEM NOTES.- io-YR PEAK DESIGN
1 . SM44 FACILITYS ORIFICE COEFF.=0.60 & WEIR COEFFICIENT=3.3. OVERFLOW WEIR IS HYDRAULICALL
2. DETENTION SYSTEM PIPING SHALL BE PRE -MANUFACTURED AND EQUIVALENTTO AN ORIFICIEWITH ELEV.=449.75
DELIVERED TO THE SITE TO PREVENT CORROSION WEAKNESS AND APPROX. DIAMETER OF "
LEAKS ATTHE JOINTS. --
3^ PLEASE CONTACT COLLINS ENGINEERING '4/1# mEw*numG !NSTALL7WJ(2) 0].HIGHp Eh8ERGENCYON
ANYQUES11ONS CONCERNING THE UNDERGROUND DETENTION ORIFICES ATELEV.=445'02' x 0 SPILLWAY/WEIR
SYSTEM. r 1AIC -0 ELEV.
4. TRASHRACKS SHALL BE INSTALLED ON ALL ORIFICES INCLUumu 2-,nMANut m =-445 -
THOSE LOCATED ALONG THE V0]R PLATES WITHIN THE
UNDERGROUND DETENTION SYSTEM, |NACCORDANCE W/`THEDETAIL INSTALL
PROVIDED ON THIS SHEET. ORIFICE */ELEv 44525
5' HUGGER BANDS SHALL BE LOCATED ATALL JOINTS W/MAX. PIPE
SPACINGS OF 24,, SEE 0DNTECH SPECIFICATIONS -'- PEAK DESIGN ---``---
G. THE UNDERGROUND DETENTlON SYSTEM SHALL BE 0120~ COmTECH INSTALL
CMP. SEE MANUFACTURER's SPECIFICATIONS FOR GAUGE TYPE ORIFICE ATTHE LOW POINT,
THICKNESS. ELEy'=439-75�
7. UNDERGROUND DETENTION SYSTEM PIPING SHALL BE INSTALLED WITH
��
WITH
ADEQUATE STONE BACKFILL IN ACCORDANCE W/MANUFACTURER INSTALL TRASH RKS
SPECIFICATIONS. ON ALL OR|RcES(TYp)
8. ANY RETAINING WALLS CONSTRUCTED IN THE VICINITY DFTHE
UNDERGROUND DETENTION SYSTEM WITH QEO0R\DS SHALL PLACED 0120" WEIR PLATE DETAIL
ABOVE THE UNDERGROUND DETENTION SYSTEM, OR OUTSIDE OF THE
�|T� OFPIPE CON8TRUO�DN. THE STRUCTURAL EN(�NEERSHALL
--'--'- �
LIMITS
WORN DIRECTLY WITH ODNTECH 8c SHALL ENSURE ALL DESIGN
REQUIREMENTS ARE MET __ __ __
8. A MINIMUM COVER OF 18" IS REQUIRED OVER THE 24- MUV- COVER UNDER PAVEMENT
�TYP)
DETEN11ON 8YSTEM, AS DESIGN. 18° MIN. COVER umog_ eo|_ /rvP>
SIDE, f�AIILDJEWL
UNDERGROUND DETENTION SYSTEM MAINTENANCE
�[[)NTECHUNDERGROUND STORK8VVATERDETENTION SYSTEM SHALL BE
MAI NTA|NED|NACCO RDANCE WITH [ONTE[HCK4PDETENT|[)NREOU|REk4ENTS.
LPMJTSOF
z� SYSTEK4SHALL BE|NSPECTEDANNUALLY F{)RA[CUK4ULATE D SED|N1ENT.
} THE UNDERGROUND DETENTION SYSTEM SHALL 8ECLEANED WHEN INSPECTION
-
REVEALS THAT THE ACCUMULATED SEDIMENT ORTRASH |5[LDGG|NGTHE
'
DISCHARGE ORIFICES &VVBR.THIS MAYBE MORE FREQUENTLY THAN ONCE AYEAR.
4. THE CONTRACTOR |SRESPONSIBLE F0RTHEMAINTENANCE OFTHEUNDERGROUND
DETENT|ONSYSTEMFORTHEFIRST YEAR, �AND THE OWNER |SRESPONSIBLE FOR |T
THEREAFTER.
5 ACCESS/INSPECTION MANHOLES NEAR THE INLET AND OUTLET ARE PROVIDED FOR
FOR AD�|7DONAL '
0
- --��-''- INSPECTION §&K4A|NTENAN[E
� | BAOKRLL|NFDRW&�Om �
!
SEE THIS SHEET 6. [LEANOUT5SHALL 8ESCHEDULED DURING ORYVVE/\THER.
TYPICAL SECTION.VIEW
SGALE- NTS,
STIR: 30 D| --3B, L='6'
STA. 10+00J61
TP=458.7D
INV IN: 448.62 TO 32
INV OUT: 445.52 TO UGD
INV OUT: 44&52 TO 24 (JUNCTION)
4,551
kTED BYPASS PIPING FOR
FREQUENTSTORMS
1 4451
OUTFLOW TO UGD VIA PIPE 29
F OENT STORMS
4.401
048" CONTECM
ACCESS MH
450
INFLOW FROM ELEVATED
BYPASS (PIPE 25)
SIM
24" HDPIE 8.94 LF
5.71
/�4�l | | |
..~ / / /
E�Vt35.00 EG)I-x
435 1
455
STR: 24 (JUNCTION)
VDOT STD. MH -1
!STA. 10+61.72
452C0
[INV IN. 447'24 TO
30
UNV IN: 438.24 TOUGD
�
�
ANV OUT. 439.14 TOR3PRAP OUTFALi
m
�
46 00 RIS R,
| |
LESS FREQL
60 LIF OF 0120" CMP
UNDERGROUND
DETENTION SYSTEM
UPLAND OF WEIR PLATE
WEIR �L�7E
�O��(
SEE DETAIL
'
0ETEP
439.75
UPLAND C
To
ji
tADOER� RAILS
TYPICAL SECTION.VIEW
SGALE- NTS,
STIR: 30 D| --3B, L='6'
STA. 10+00J61
TP=458.7D
INV IN: 448.62 TO 32
INV OUT: 445.52 TO UGD
INV OUT: 44&52 TO 24 (JUNCTION)
4,551
kTED BYPASS PIPING FOR
FREQUENTSTORMS
1 4451
OUTFLOW TO UGD VIA PIPE 29
F OENT STORMS
4.401
048" CONTECM
ACCESS MH
450
INFLOW FROM ELEVATED
BYPASS (PIPE 25)
SIM
24" HDPIE 8.94 LF
5.71
/�4�l | | |
..~ / / /
E�Vt35.00 EG)I-x
435 1
455
STR: 24 (JUNCTION)
VDOT STD. MH -1
!STA. 10+61.72
452C0
[INV IN. 447'24 TO
30
UNV IN: 438.24 TOUGD
�
�
ANV OUT. 439.14 TOR3PRAP OUTFALi
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�
BYPASS PIPING 0
| |
LESS FREQL
60 LIF OF 0120" CMP
UNDERGROUND
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UPLAND OF WEIR PLATE
WEIR �L�7E
�O��(
SEE DETAIL
'
0ETEP
439.75
UPLAND C
10+00 10+50 11+0011+25
General Construction notes for 5tormwaterManagement Plans
i.All dams and constructed fill tobewithin g5%ofmaxmom6rydensity and 2%of
optimum moisture content. All fill material to be approved by a geotechnical engineer.
Ageotechnical engineer isto6epresent during construction ofdams.
a.Pipe and riser]ointsare to6ewatertight within stormwoterManagement faci|ities.
3. For temporary sediment traps or basins which are to be converted to permanent
stormwater management facilities; conversion is not to take place untilthesiteis
stabilized, andpermission hasbeen obtained from the County erosion control inspector
STR:30 D|-313, i=16~
STA. 10f-09'61
TP=458'70
|N\/ IN: 448.82 TO 32
INV OUT: 445.52 TO UGD
INV OUT: 448.52 TO 24 (JUNCTION)
STR:32 0-3121, L=6"
STA. 10+33.18
0 [INV IN: 449.78 TO 34
INV OUT: 1449.68 TO 30 46,0
INV OUT: 450.25
455 455
FIRROPOSED
450 450
�IPE 29A) FOR
ENTSTORMS 15 HDPE 87.47 LF
1 5* HDPE 23.57 LF 445
TlION SYSTEM
F WEIR PLATE
440 .015.75% 1440
\INV OUT. 443.75
-JOINTS SHALL BE WATERTIGHT BETWEEN
SERVE AS BYPASS FOR LARGER STORM EVENTS
4-35 ]--4
432 432
LO
10+00 10+50 11+00 11+5011+75
QNSTRUC11ON NOTES:
MA����O�E������AM��J��M���| SHALL CONSIST ��L�D���|N�����
/' ������THAN 8INCHES |NTHICKNESS BEFORE COMPAC11ON OVER THE ENTIRE AREA |NACCORDANCE NTH CURRENT VDOT ROAD AND BRIDGE SPECIFICATIONS.
2' yDDTSTD' |S-1 REQUIRED ON ALL STRUCTURES.STD pB 1 SHALL �E �E� FOR p!pE BEDDING AND BACKFILL. THE MINIMUM HBQHTOFCOVER FOR PIPES SHALL BE MET AND BE IN ACCORDANCE WITH \DOT
I THE �|N|�U� �E�U|RBWBNT8 SET FORTH |N ��cn . - �
STD PC 1
4` ALL FILL ' ^~ - SHALL BE PLACED AT 95% COMPAC�ON AND TESTED BY A GEOTECHNICAL ENGINEER TO ENSURE COMPACTION IS REACHED AND MAUNl�`|NEO'CONTRACTOR SHALL
5^ PRIOR CONSTRUCTION THE CONTRACTOR SHALL TEST -DIG AT THE EXISTING INLETS AND OUTFALLS TO CONFIRM GRADES CAN BE /W]1|EVB}.
RW THE INVERTS AND TO �N�U�� Dj� N0E8 |N THE HORIZONTAL VE�TlALAUQN��NTpR|D�
ALSO VERIFY EXISTING ELEVATIONS OF CURB, GUTTER, PAVEMENT AND BUILDINGS, CONTRACTOR SHAH LWO�FYCOLUNS ENGINEERING OFANY D|SCR[pa C
TO ORDERING AND CONSTRU011ON
G ALL SLOPES STEEPER '~~~�' AN 3:1 SHALL HAVE A U3YVMAINTENANCE GROUND COVER FOR STABILIZATION PURPOSES. THESE AREAS SHAU-NOTBE PLANTED WITH GRASS COVER, AND SHALLBEA
' '- GROUND COVER CHOSEN FROM 337C OF THE \ESCH UNLESS OTHERWISE DIRECTED BY THE INSPECTOR.
EXCAVATION�, ALL EXCAVATION FOR UNDERGROUND PIPE INSTALLATION MUST COMPLY WITH OSHA STANDARDS FOR THE CONSTRUCTION INDUSTRY (29 CFR PART 192$)`
E~-
8' PRIOR TO PLACING THE UNDERGROUND DETEN71ON SYSTEM BEDDING, THE FOUNDATION SHALL BE CONSTRUCTED TO A UNIFORM AND SGRADE.�� wnrmIN THE EVENT THAT UNSUITABLE FOUNDATION MATERIALS ARE
ENCOUNTERED DURING EXC��'''-, THEY SHALL BE REMOVED AND THE AREA BROUGHT BACK TO GRADE WITH A FILL MATERIAL APPROVED BY THE F1pE MANUFACTURER MEETING MINIMUM VDOTREQUIREMENTS.
ONCE THE FOUNDATION PR -- NON IS COWPLETE, 6. OF 4 WELL -GRADED GRANULAR MATERIAL SHALL BE PLACED ASTHE BEDDING.
amS�WMVM LOAM, -
\.OUTFLOW TO PLUNGE
POOL VIA PIPE 23
435 435
432 4,32
Lq
WW
10+00 10+5010+75
'
CONStRUCTION LOADING DI AGRAM
INAVGWQ -;F -KAAINO
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122071
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10+00 10+50 11+00 11+5011+75
QNSTRUC11ON NOTES:
MA����O�E������AM��J��M���| SHALL CONSIST ��L�D���|N�����
/' ������THAN 8INCHES |NTHICKNESS BEFORE COMPAC11ON OVER THE ENTIRE AREA |NACCORDANCE NTH CURRENT VDOT ROAD AND BRIDGE SPECIFICATIONS.
2' yDDTSTD' |S-1 REQUIRED ON ALL STRUCTURES.STD pB 1 SHALL �E �E� FOR p!pE BEDDING AND BACKFILL. THE MINIMUM HBQHTOFCOVER FOR PIPES SHALL BE MET AND BE IN ACCORDANCE WITH \DOT
I THE �|N|�U� �E�U|RBWBNT8 SET FORTH |N ��cn . - �
STD PC 1
4` ALL FILL ' ^~ - SHALL BE PLACED AT 95% COMPAC�ON AND TESTED BY A GEOTECHNICAL ENGINEER TO ENSURE COMPACTION IS REACHED AND MAUNl�`|NEO'CONTRACTOR SHALL
5^ PRIOR CONSTRUCTION THE CONTRACTOR SHALL TEST -DIG AT THE EXISTING INLETS AND OUTFALLS TO CONFIRM GRADES CAN BE /W]1|EVB}.
RW THE INVERTS AND TO �N�U�� Dj� N0E8 |N THE HORIZONTAL VE�TlALAUQN��NTpR|D�
ALSO VERIFY EXISTING ELEVATIONS OF CURB, GUTTER, PAVEMENT AND BUILDINGS, CONTRACTOR SHAH LWO�FYCOLUNS ENGINEERING OFANY D|SCR[pa C
TO ORDERING AND CONSTRU011ON
G ALL SLOPES STEEPER '~~~�' AN 3:1 SHALL HAVE A U3YVMAINTENANCE GROUND COVER FOR STABILIZATION PURPOSES. THESE AREAS SHAU-NOTBE PLANTED WITH GRASS COVER, AND SHALLBEA
' '- GROUND COVER CHOSEN FROM 337C OF THE \ESCH UNLESS OTHERWISE DIRECTED BY THE INSPECTOR.
EXCAVATION�, ALL EXCAVATION FOR UNDERGROUND PIPE INSTALLATION MUST COMPLY WITH OSHA STANDARDS FOR THE CONSTRUCTION INDUSTRY (29 CFR PART 192$)`
E~-
8' PRIOR TO PLACING THE UNDERGROUND DETEN71ON SYSTEM BEDDING, THE FOUNDATION SHALL BE CONSTRUCTED TO A UNIFORM AND SGRADE.�� wnrmIN THE EVENT THAT UNSUITABLE FOUNDATION MATERIALS ARE
ENCOUNTERED DURING EXC��'''-, THEY SHALL BE REMOVED AND THE AREA BROUGHT BACK TO GRADE WITH A FILL MATERIAL APPROVED BY THE F1pE MANUFACTURER MEETING MINIMUM VDOTREQUIREMENTS.
ONCE THE FOUNDATION PR -- NON IS COWPLETE, 6. OF 4 WELL -GRADED GRANULAR MATERIAL SHALL BE PLACED ASTHE BEDDING.
amS�WMVM LOAM, -
\.OUTFLOW TO PLUNGE
POOL VIA PIPE 23
435 435
432 4,32
Lq
WW
10+00 10+5010+75
'
CONStRUCTION LOADING DI AGRAM
INAVGWQ -;F -KAAINO
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