HomeMy WebLinkAboutSDP199700047 Plan - Drainage and E&S 1997-05-122�
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j ri DEVELOPEY?.# rT_+ k
Forrell Land r
Cattle Company,
Post Office 5386
Cbarlottes��He, Vi-eginia 22905
,
Phone
04-977- Ro**�rFax No.: 804-977-6578Attnoo Mr. Andrew J. ,9.racopoli, V.P.
LEGEND_
Jordan C®rnisulting
Engineers,
2540 Pro-Olessional Road
R-icbmo.D. cl". Mirginia 23235
Phone J'Vo, 272-7009
Fax - No. -7088
2
INDEX
EXISTING
SHEET' NO.
TITLE
/ti1250-=
1 YYCC 31
PRVJam+/�JJ��OSED I
2 OF 7 EROSION CONTROL NOTES DETAILS
ASPHALT PAVEMENT PAVEIAENT90
PROPERTY LINE \ 3 OF 7 '
CULT/ERT OR STORY SEWER PIPE" i �� ,� MP iine!lo� 1 � s�� "� � � OUERA�L GRAD/NG �c ORA/NAGE PLAN
Q_SAN, ..ANITARY SEWER � '��� 1� Ce� i`I`t \
Q DRAINAGE STRUCTURE NUMBER !r
Ute,:- l �; ,, 4 OF 7 EROS/ON CONTROL PLAN
- f WATER LINE Toimb
!
INDICATES 11INIU0,1 FINISHED BUILDING ELEVATION THAT ''' � r ° � �` � r
B i 5 OF 7 E-�OS/ON CONTROL PLAN
M/N. F.F.177.00 U. P. POWER LINE tl
CAN BE USED ON A SPEC/FIC LOT /N ORDER TO GET BUILDING � • ; : ,. ' ; ,y ., ,, � !; c
(s) OR (D)ABOVE THE »' STORM ELE�/ DR TO OBTAIN GRAi�/TY ,SAJV. SEWER U DENOTES UNDERGROUND y`� ;,, 6 OF 7 EROS/ON CONTROL PLAN
(S) DENOTES SAN. SEXIER U TELEPHONE LINE OH DENOTES OVERHEAD
(D) DEVOTES DRAINAGE GAS GAS LINE 7 OF 7 DRAINAGE ANALYSIS SHEET
INDICATES LOTS PINICH MUST HAVE DRAINAGE 1UPRO, ErM5r11-S � � �,...=s..� CUL /ERT OR STORE! SEWER PIPE
INSTALLED PRIOR TO BUILDING PERIAITS BEING ISSUED CINI Y lyf.AP
FOR THAT LOT. _ FIRE HYDRANT
REGULAR SEEDED EARTH DITCH WITfI DIRECTION OF FL0131 BENCH MARK LOCATION Scale:.1 000,
CROSS HATCH/NG OF EITHER OF THESE INDICATES THAT PALED DITCH
LINING MAY SE NECESSARY IF SUITABLE VEGETATION CANNOT BE - 174 EX/ST/NG CONTOUR ELEi/AT/ON
ESTABL/SHED /N D/TCH UNE.
EC -2 LINED DITCH WITH SEEDING CLOUDING OF TEXT INDICATES
PAVED LINED DITCH REVISION TO PLANS
I� INDICATES DEPTH OF EC -2 OR PAVED DITCH LINING
>8"
INDICATES DRIVEWAY PIPE SIZE IF GREATER THAN 150
0— — SANITARY 56TIER UNE
RATER LINE
174.,,/ PROPOSED FINISHED GRADE CONTOUR ELEVATION
E/P DENOTES EDGE OF PAVEMENT
TIC DENOTES TDP OF CURB
F/C DENOTES FACE OF CURB (MEASURED TO BACK OF ANY ROLL ,DACE CURB)
9/0 DENOTES BACK OF CURB
DENOTES FILL AREA (NO FINISHED CONTOUR SHOWN)
—> —4> DENOTES HOPI LOT SHOULD BE GRADED FOR SURFACE DRAINAGE
NOTES:
1. ALL STORU AND SAN. SEPrER PIPE LENGTHS ARE MEASURED FROM
CENTER OF DRAINAGE STRUCTURES (D./. OR 1AH.)
2. CONTRACTOR IS TO MAKE HIS OPIN TAKE -OFF ON THESE PLANS
AS ANY QUANTITIES SHORN ARE APPROX/"AATE ONLY TO SHOW
SCOPE OF WOR,,'(.
J. CONTRACTOR SHALL BE RESPONSIBLE FOR COUPLETION AND
FINAL ACCEPTANCE OF ALL CONSTRUCTION WID UTILITY LINES
1,pJ,TH 07%
o l
0 `1%
u M.M-1,. MILLS
Reg. No. 048
P. ce
ECF k
MAY 7
Engineering <, ,. «irks
GENERAL NOTES
1. EX STING U77LIT/ES
THE LOCA TION OF EXISTING SEWER, WA TER, POWER, GAS, TELEPHONE, AND
OTHER UT7LILES AND STRUCTURES WHICH ARE LOCATED ACROSS, UNDERNEATH,
ALONG AND WITHIN THE LIMITS OF THE PROPOSED WORK ARE NOT NECESSARIL Y
SHOWN ON THE PLANS, AND WHERE SHOY/N ARE ONL Y APPROX/MA TEL Y CORRECT.
PRIOR TO CONSTRUCTION, THE CONTRACTOR SHALL NOTIFY THE UNDERGROUND
PROTECTION CENTER (USS UTILITY) AT 1-800-552-7001 AND, AT HIS OWN
COST, VERIFY THE L OCA TIONS AND ELEVA TIONS OF ALL EXISTING UTILI TIES
WITHIN THE LIMITS OF COAISTRU07701V HE SHALL N077FY THE ENGINEER
IMMED/A TEL Y IF THERE APPEARS TO BE A CONSTRUCTION CONFLICT OR UPON
DISCOVERY OF ANY UTILITY NOT SHOWN ON THE PLAN. THE CONTRACTOR SHALL
BE LIABLE FOR ALL DAMAGE DONE TO ANY S7RUCIURES OR PROPERTY THROUGH
HIS CARELESSNESS OR NEGLIGENCE. ANY GRADE STAKES, HUBS, ETC. DESTROYED
WILL BE REPLACED AT THE CONTRACTORS EXPENSE
THE CONTRACTOR SHALL NOTIFY THE APPLICABLE GOVERNMENTAL PUBLIC
WORKS AND PUBLIC U77LITY DEPARTMENT AT LEAST 24 HOURS PRIOR TO START
OF WORK ON THE PROJECT.
2. M47CR/ALS AND WORKMANSHIP
ALL MATERIALS AND WORKMANSHIP SHALL BE DONE IN ACCORDANCE W/TH THE
LATEST ED177ONS OF
(A) VIRGINIA DEPARTMENT OF TRANSPORTA 770AIS "ROAD DESIGN
STANDARDS" AND "ROAD BRIDGE SPECIFICA TIONS"
(B) APPLICABLE ALBEMARLE COUNTY ORDINANCES AND REGULA770NS.
(C) THE LATEST RULES AND REGULA77ONS GOVERNING CON57RUCTION DEMOL177ON
AND EXCA VA 77ON AS ADOPTED BY THE SAFETY CODES COMMISSION OF THE
COMMONWEALTH OF VIRGINIA AND OOSRA.
3. DEKA 77ON FROM PLANS
NO DEVIATION FROM THESE PLANS WILL BE ALLOWED WITHOUT PRIOR WRITTEN
APPROVAL OF THE OWNER, ENGINEER AND AFFECTED GOVERNMENTAL AGENCIES.
4. CLEARING AND GRUBBING
A. ALL GROWTH OF TREES, OTHER VEGETATION AND OBJECTIONABLE DEER✓S
SHALL BE CLEARED AND GRUBBED FROM 7hT PROPOSED PAVED AND BUILDING
AREAS AS N✓ELL AS AREAS INDICA IED TO BE GRADED ON THE PLANS
S. ALL CLEARING AND GRUBBING WITHIN THE U17LITY EASEMENTS AND SPECIAL
FILL AREAS SHALL BE TO THE LENGTH AND WIDTH NECESSARY TO CONSTRUCT THE
IMPROVEMENTS SHOWN ON INE PLANS.
C. ALL TREES, BRANCHES, VEGETA TION AND DEBRIS SHALL BE DISPOSED OF
IN A LEGAL MANNER ACCEPTABLE TO THE OWNER AND ENGINEER. BURNING PERMITS
WILL BE OBTAINED BY THE CONTRACTOR AT HIS EXPENSE.
D. ALL 7REFS AND VEGETA 7708 WHICH OBSTRUCT SIGHT DISTANCES A T ROAD
INTERSECTIONS SHALL SE REMOVED SO AS TO OBTAIN 777E MAXIMUM SIGHT
DISTANCE AT EACH IN7FRSEC770A✓
5. TOPSOIL STRIPPING
CONTRACTOR SHALL REMOVE TOPSOIL TO ITS ENTIRE DEPTH FROM ALL AREAS
TO BE GRADED AND OR FILLED. HE SHALL STOCKPILE OR REMOVE THE TOPSOIL
FROM THE SITE AT OWNERS DIRECTION.
6. GRADING
A. ROADWAYS, EASEMENTS, AND SPECIAL FILL AREAS TO BE GRADED AND
COPPACIED TO THE FINISHED SUBGRADE OR GRADES AS SHOWN ON THE
PLANS. CON7RACT0R OR OWNER SHALL HAVE REPRESEN7A77VE SUBGRADE
CBR 7FST RUN AND SHALL REPORT TO THE OWNER, ENGINEER, AND ANY
AFFECTED GOVERNMENTAL AGENCIES ANY TEST WHICH SHOW A CBR OF LESS
THAN 10. IN SUCH CASE ROAD PA VEMENT DESIGN MA Y HA VE TO BE RE-
DESIGNED TO MEET WITH THE ACTUAL SOIL- COIVD177ONS ENCOUNTERED
S. IF UNSUITABLE MATERIAL IS ENCOUNTERED WITHIN THE ROADWAY, PARKING
AREA OR ANY SPECIAL FILL AREA, /T SHALL BE REMOVED FROM THE ENTIRE
PROPOSED PAVED AREA OR fXL AREA AND REPLACED W/7H SELECT BACKFILL
WHICH IS SUITABLE FOR ROADWAY (OR BUILDING S11 -E) CONSTRUCTION AS
PER 'VDOT' REOUIREYLW1`S AND ANY SPECIAL REQUIREMENTS OF THE COUNTY
OWNER, ENGINEER, AND ANY AFFEC7FD GOVERNMENTAL AGENCIES.
C. FILL AND BACKFILL MATERIAL SHALL BE COMPAC7ED TO 959 STD. PROCTOR
DENSITY AT OP77MUM MOIS7URE -f•-2i' UNLESS SPECIFIED OTHERWISE ON THE
PLAN
D. ALL GRADING OPERA 77ONS SHALL BE DONE /N SUCH A MANNER SO AS TO
PROVIDE POS177VE DRAINAGE AT ALL 74,'ES.
E. AT ALL ROAD INTERSEC77ONS /N A CUT SECTION, THE BACK SLOPES AND
VEGETATION SHALL BE' CUT BACK WITH AT LEAST 3.-1 BACK .SLOPES SO AS TO
PROVIDE PYE BEST POSSIBLE SIGHT DISTANCE
F. STANDARD SPRING BOXES (SB -1) AND UNDERDRA/N SY57FM (UD -1 10-2)
WILL BE INSTALLED AT LOCA77ONS SHOWN ON THE PLANS AND WHEREVER FIELD
CON011701VS WARRANT.
7. DRAINAGE STRUC7ZIRE-S AND MINOR EXCA VA 77ON
A. ALL PIPE' CULVERTS AND STORM SEWER SYSTEMS SHALL HA VEA MINIMUM COVER
OF 1 FOOT AND SE MADE OF THE MA 7FRIAL SPECIFIED ON THE PLANS. IF
THIS PROJECT /5 LOCATED /N ALBEMARLE COUNTY ALL STORM SEWER SHALL
HA VE A MINIMUM OF 4" INCHES AGGREGA TF BEDDING MA TERIAL.
S. BACKFILL FOR ALL U77LITTES WITHIN PROPOSED STREETS SHALL BE PLACED
GENERALLY 1N ACCORDANCE P7TH ALBEMARLE COUNTY U77LITY SPECIFICA]TONS.
AND THE FOLLOWING CRITERIA:
1) NO TRENCH SHALL BE BACKFILLED UM77L AUTHORIZED BY THE INSPECTOR
OR OWNER OR HIS AUTHORIZED REPRESENTA77VE. MA7FRIALS USED FOR
BACKFILL FROM THE TRENCH BOTTOM TO 12 INCHES ABOVE THE PIPE
SHALL BE SELECT MATERIAL, FREE FROM FROST, LARGE CLODS, STONES,
AND DEBRIS. IT SHALL BE THROUGHL Y AND CAREFULL Y COMPACTED TO
INSURE A SOUND BACKFILL AROUND AND OVER THE PIPE.
2) BACKFILL SHALL BE COMPACTED BY MECHANICAL TAMPING THROUGHOUT
THE DEPTH OF THE TRENCH TO OBTAIN 959 DENSITY AT OPTIMUM
MOISTURE -7-29 THIS IS TO INSURE A SUITABLE SUBBASE
ACCEPTABLE FOR PROPOSED 577FEETS AND PARKING AREAS.
3) IF IN THE OPINION OF THE OWNER, T1£ ENGINEER OR ANY AFFECTED
GOVERNMENTAL AGENCY THE MATERIAL TAKEN FROM THE DITCH IS NOT
SUITABLE FOR BACKFILL, IT SHALL BE REMOVED AND ACCEPTABLE
MA 7FR/AL USED FOR BACKFILLING SHALL BE OBTAINED.
C. 7RENCHES SHALL BE EXCA VA TED TO A MINIMUM OF 4 INCHES BELOW THE
BOTTOM OF THE SAP.REL OF THE PIPE AND A BEDDING SHALL BE PROVIDED
AND INSTALLED OF SELECT MATERIAL SUITABLE TO MEET vDOT PB -1 PIPE
IN57ALLA7701V REOUIRE,MENT3: TRENCHES SHALL NOT BE CUT OVER 16 INCHES
WIDER THAN THE OUTSIDE DIAMETER OF THE PIPE UNLESS AN UNSUITABLE
FOUNDA 77ON MATERIAL IS ENCOUNTERED
8. BASE AND PAVEMENT ITEMS
A. SUBGRADE MUST BE CHECKED BY AFFECTED GOVERNMENTAL OFFICIALS, AND
OWNER FOR GRADE, 7E;MPL.ATE AND COMPAC770N BEFORE BASE IS APPLIED.
B. BASE AND PAVEMENT MATERIALS SHALL MEET ALL 'VDOT' SPEC1fICA 77ONS
AND SHALL BE APPLIED IN ACCORDANCE WITH THE CURRENT 'VDOT' SPEC/-
FICA TONS. ALL MA7FRIALS MUST BE TESTED AND APPROVED BY 'VDOT'
OR APPLICABLE GOVERNMENTAL AGENCY OFFICIALS PRIOR TO EMPLACEMENT.
C PA V/BG OPERA770A✓S SHALL NOT BE STARTED BE7WEEN NOVEMBER 15 AND
APRIL 1 WITHOUT WRITTEN AUTHOR/ZA PON OF ALBEMARLE COUNTY
OFFICIALS AND THE OWNER.
D. WHEN USING PUG MILLED AGGREGATE BASE MATERIAL WHICH IS 7ES7F9
BY 'VD 0r OFFICIALS AT THE PLANT, THE TEST WILL BE GOOD FOR 90 DAYS
ONLY. ADDITIONAL "IN PLACE" TEST SX4" BE MADE AF7ER 90 DAYS.
E. WHEN LOCAL BASE MATERIAL (TYPE //) IS PROPOSED FOR ROAD BASE, IT
SHALL BE TESTED AND APPROVED BY 'VDOT' OFFICIALS PRIOR TO BEING
USED. OWNER AND ANY AFFECTED GOVERNMENTAL OFFICIALS SHALL ALSO
CHECK AND APPROVED LOCAL BASE MATERIALS FOR DEPTH, COMPACTION,
AND CONS/S7FNCY ONCE IT HAS BEEN PLACED IM ROADWAYS.
10. ALL ENTRANCE PERMITS TO PUBLIC ROADS MUST BE OBTAINED BY THE
CONTRACTOR AT HIS EXPENSE PRIOR TO CONSIRUCT70N. ALL OTHER PERIr1/75
NECESSARY TO UNDERTAKE IRIS PROJECT MUST BE OBTAINED BY 77,1E CON77FACTOR
PRIOR TO CONSTRUC770N (AT THE CONTRACTORS EXPENSE).
11. ELEVA TIONS ON THE PLANS ARE TO DA 7UM ESTABLISHED BY THE N. G. S. OF
THE X. 0. A. A.
12. A LONGITUDINAL DROP INLET (ON GRADE) SHALL BE POURED WITH THE
THROAT ON THE SAME GRADE AS 77 -IE ADJOINING CURB AND GUTTER UNLESS
SPEC617CALLY NOTED OTHERWISE ON THE PLANS.
13. ALL CON57RUC770N STAKING WILL BE'AT THE CON7RACTOR'S EXPENSE
UNLESS AGREED UPON BY THE OWNER IN WRI77NG.
E & S UTILITY N07ES
All excavated materia/ is to be p/ace on the uphill side of trench.
A// storm and sanitary sewer lines not in streets are to be mulched and seeded
within 7 days after bocki111, no more than 500 feet are to be open at one
time.
Construction access roads shall be located on the uphill side of the trench or
over the trench whenever possible.
A// construction discharge water shall be adequately filtered to remove silt
prior to discharge into waterways and wet/ands
A// streams crossing and stream diversions require environmental approval
prior to any instreom construction (see IN -STREAM NOTES)
GENERAL EROSION AND SEDIMENT 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 Virginia Erosion and
Sediment Control Handbook and Virginia Regulations VR 625-02-00
Erosion and Sediment Control Regulations. -
ES -2: 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.
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 the site at all times.
ES -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.
ES -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.
ES -7: All disturbed areas are to drain to approved sediment control measures at
all times during land disturbing activities and during site development until
final stabilization is achieved.
ES -8: During dewatering operations, water will be pumped into an approved
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 effectiveness of the erosion control devices shall
be made immediately.
SEEDING NO1 FS
All stabilization/seeding will be accomplished in accordance With the Virginia
Erosion and Sedimentation Control Handbook.
Any disturbed area not paved, sodded, or built upon, will have a minimum of
80q vegetative cover prior to final inspection, and in the opinion of the
Environmental Engineer wi/I be mature enough to control soil erosion
satisfactorily and survive severe weather conditions
Stream diversion areas, waterways, banks and related areas will be seeded and
mulched immediately after work in watercourse is completed.
Winterization - any disturbed area not paved, sodded or built upon by October
15 is to be seeded and mulched on that dote unless waived by the Environmental
Engineer.
Permcr7ent or temporary soil stabilization shall be applied to denuded areas within
7 days `ter final grade is reached on any portion of the site. Temporary soil
stcbilizc.`ion shall be applied within 7 days to denuded areas that may not be at
Anal 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 thcz17 1 year.
Electric power, to%phone, and gas supe/y trenches are to be compacted, seeded
and mulched within 7 days after backfill.
All temporary earth berms, diversions, and silt dams are to be mulched and
seeded for vegetative cover immediately after grading. Straw or hay mu/ch is
required. The some applies to al/ stockpiles, on site as well as soil
(intentionally) transported from the project site.
All fertizing, liming, seeding and mulching will be done at the fo/ling rotes
unless otherwise specified on the plans. -
LIMESTONE - 2000 lbs per acre
FERTILIZER - 1000 lbs. per acre
KENTUCKY 31 FESCUE - 150 lbs per acre
ANNUAL RYE GRASS - 100 lbs per acre
MULCH (STRAW OR APPROVED EOU/VALENT) - 40 lbs. per acre
/ /L �E-R BARRIZ t NOTES
TES
Filter barrier is applicable in ditch lines, around drop inlets and low flow
areas.
The height of filter barrier sho// be a minimum of 15 inches and shall not
exceed 17 inches.
Ten ounce per square yard burlap or standard strength synthetic fabric is
used.
The stakes shall be spaced a maximum of 3 feet apart Stakes for fi/ter
barriers shot/ be 7" x 2" wood (preferred) or equivalent metol with a minimum
length of 3 feet.
If a f/Iter barrier is to be constructed across a ditch line or sw% the
barrier shall be of sufficient /ength to eliminate end flow, the configurat/on
sho/l resemble on arc or horseshoe.
SIL T FENCE NOTES
Silt fence and filter fabric must be entrenched
Post for si/t fences shall be either 2.5 x 2 inch diameter wood or 1.25 pounds
per linear foot steel with a minimum length of 5 feet. Steel post shc1l have
projections for fastening wire to them.
Wre fence reinforcement for sift fences using standard strength fi/ter cloth
Shall be a minimum of 42 inches in height, a minimum of 14 gauge and shall
have a maximum mesh spacing of 6 inches
Post shall be spaced a maximum of 70 feet apart at the barrier location and
driven secure/,y into the ground (min. of 12 inches) when extra strength fabric
is used. Without the wire support fence, post shall not exceed 6 feet.
When extra strength filter fabric and closer post spacing are used, the wire
mesh support fence may be eliminated. In such a case, the f17ter fabric is
stapled or wired directly to the post.
Sediment must be removed when deposits reach approximately one-ho/f the height
of the barrier.
Any sediment deposits remaining in place after the silt fence or fi/ter
barrier is no longer required shall be dressed to conform with the existing
grade, prepared and seeded.
Under no circumstances should silt fence be constructed in live steams
Silt fence shall be removed upon completion of the project.
DRIP UNE'��� J ��
PARO7FC77VE
MAX/MUM 1/M/75 OF
CLEAR/NG AND GRADING
PROPOSID GRAD/NG t A i A
i
MIN. 5'
WHERE OR/PUNT /S
LESS THAN 5'
CONSTRUCTION OPERATIONS RELATIVE
TO THF LOCATION OF PROTECTED TREES
(PLATE 3.38-1)
STANDARD COMMENTS FOR TREE PROTECTION PLANS
NO LAND D/57URBING ACTIVITIES MAY OCCUR ON SITE PRIOR TO THE RELEASE OF THE
CONSTRUCTION PLANS BY ALBEMARLE COUNTY PLANNING DEPARTMENT, UNLESS
SPECIFICALLY REQUIRED TO INSTALL TREE PROTECTION MEASURES.
A PRE -CONSTRUCTION MEETING /S REQUIRED TO REVIEW 77REE" PROTECTIONMEASURES ON
SITE PRIOR TO THE RELEASE OF CONSTRUCTION PLANS BY THE ALBEMARLE COUNTY PLANNING
DEPARTMENT. ALL TREE PROTECTIVE FENCING MUST BE /N PLACE AND INSPECTED PRIOR
TO COMMENCEMENT OF ANY LAND DISTURBANCE ACTIVITY.
TREE PROTECTION MEASURES SHALL BE /8 PLACE AT TIMES AND PROPERLY MAINTAINED
UN77L FINAL ACCEPTANCE OF 771E PROJECT.
WHEN THE PLAN REQUIRES A TREE PR07FC77ON DEVICE AND AN EROSION CONTROL DEVICE
THE EROSION CONTROL DEVICE SHALL BE ON 77YE UPGRADE SIDE OF THE TREE PR07FC770N
FENCING.
THE INSTALLATION OF THE TREE PROTECTION FENCING MAY REQUIRE MINOR DISTURBANCE OF
VEGETATION TO CONDUCT SURVEY OPERATIONS. THIS D/S77JRSANCE SHALL BE MINIMIZED
AS MUCH AS POSSIBLE. THE LIMITS OF 7REE PROTECTION SHALL BE FLAGGED BY AN
AUTHORIZED AND LICENSED SURVEYOR AFTER THE LIMITS OF CLEARING HAVE BEEN PROPERLY
CALCULATED. THE SURVEYOR WILL THEN USE A BUSH AXE TO CUT "LINES" IN SET77NG UP
THE ASSOCIATED CLEARING L/M/TS. AFTER BEING FZA6GED 7 R OWNER SHALL BE
RESPONSIBLE FOR INSTALLATION OF THE TREE PROTECTION FENCING AND SIGNAGE.
ALL PUBLIC, SEMI-PUBLIC, OR PRIVATE U77LITY LINES MUST UTILIZE 777E LIMITS OF CLEARING
AS INDICATED ON THIS PLAN.
TREE PROTECTION DELINEATION FOR LIMITS OF CLEARING. STANDARD ORANGE V/BYL OR
PLASTIC CONSTRUCTION FENCE ATTACHED TO POSTS (PRE -WEATHERED WOOD, GALVANIZED
STEEL, IRON Of THICK PVC PLASTIC), AT LEAST 40' ABOVE FINISHED GRADE W/77/ SPAN
BETWEEN POSTS NO GREATER THAN 6' ON CENTER. EVERY NINTH POST SHALL CONTAIN A
WARMING SIGN OF SIZE AND TYPE PERMITED BY CHAPTER 22-104 OF THE HENRICO
COUNTY ZONING' ORDINANCE THAT CLEARLY /NDENTIF/ES THE PURPOSE OF THE FENCE i. e
TREE PROTECTION FENCING. ALL FENCING AND SIGNS SHALL BE APPROVED BY THE
ALBEMARLE COUNTY PLANNING DEPARTMENT PRIOR TO INSTALLATION.
r� L _
VDOT No. 1
COARSE AGGREG47F'
FLOW ry
i/
NODIF,ED Of FCI( DAM
SID. & SPEC. 3.20
DRCP INLET PROTOPW
.CURB INLET
WIRE SCREEN
_7- -
GRAVFL FILTER
RUNOFF WA 7r7
W77Y SEDIMENT-\ OVERFLOW
0
MRF SCREEN 2X4WOOD
STUD
Specific Application
This method of` inlet protection is applicable at curb inlets
where overflow ,cgoability is necessary to prevent excessive
ponding in fromt of the structure.
a*Grovel shall be- VDOT /3, f357, or A{5 coarse aggregate.
-2 ELL AAM6RA!EL !VIRE INLET .Sc'O/,�.�ET/T FILTER
STD. & SPEC. 3.07-8
2 x 4 WOOD
FRAME
TEMPORAR Y FILL
DIVERSION
FILL SLOPE
EARTHEN RIDGE
0 '
SEE OF
A"
PIPE OUTLET CONDI TIONS
A A`
'IPE OUTLET TO FIAT
AREA WITH NO DEFINED
;HANNEL
L a
0 - -
T r4
SECTION A -A FILTER CLOTH KEY IN 8.-9"; RECOMMEMDED FOR ENTIRE PERIMETER
• PROVIDE I' TUCK OR
SVITABL Y REINFORCED
TOP END SECTION
/M7FR CLOTTY FABRIC
OR 10 OUNCE BURLAP
FABRIC
EMBED POST
12" M/N.
DETAIL A
O7EMPCRARY /-7/- TER BARRIER
SID &SPE(' -;n5-I
FENCE
A
TOE OF FILL
FLOW
1R H
TRENCH NO7F
Temporary silt fence is to
be constructed In accordance
with the Road and Bridge
Specifications
EUSED
POST 2'
MIN.
irrcivt fY FACE- A fFNCE
£X7RA SMENGLY f-71 TER CLO7H FAS'�1^
(W17HOUT WIRE)
70' MIN.
war ju EXIST.
COARSE AGGREGA i'E5.1 PA
3'
6" ` r-RXMR CLOTH
-70' MIN.
WASHRACK
GC P0.727V£ ORA/NAGE
TO soll/ENT
100T R MAPPING DEWC£
COARSE AGta?£GA7F
(SEF PLA 7F 3.02-1 OF ZME' VA. PLAIT!/ VLc-y
EROSION AND SEDIMENT CONTROL
HANDBOOK (1992) FOR ADD17701VAL
DETAILS)
cF MWE QMSTR 7708 a NSF
S7D. & SPEC. 3.02
DROP INLET ELEVATION OF STAKE AND
WITTY GRATE FABRIC ORIENTATION
STAKES Pl-7FRED
WA7FR
BURLAP FABRIC
T' w I RUNOFF WA7FR
'- WI1N SEDIMENT
GAINER £XCE55 `(T
AT CORNERS
BURIED
BURLAP FABRIC
Specific Application
This method of inlet protection is applicable where the inlet
drains a relatively flat area (slopes no greater than 5,7)
where sheet or overland flows (not exceeding 0.5 cfs) are
typical. The method shall not apply to inlets receiving
concentrated flows, such as /n street or highway medians.
/P -1 c;LT F WC- IQRGR 2&iZ PRO7Er'TiON
SM. & SPEC. JT.07-1
MOUWABLE SEW
(OPJ7CNAL)
IV
MIN.
j-
E-xrsr.
PAVE.NENT
10,
MIN.
PROVIDE I" 77JCK OR
SUITABLY RE/NFCRCED
rOP EVD SEC77ON
EURM APPROX.
8- OF FILTER C1
IN 7RENCH
FILL TRENCH TO ANCHOR
BOTTOM OF CLOTH,
COMPACT NCROUGHL Y
EMBED APPROX. 8" OF
F11 -TER ER CLOTH /N TRENCH
]BENCH APPROX.
4' DEEP X 6' WIDE
SE -C77&/ A -A
STANDARD SIRENO;-d F/L7ER CLOTH FABRIC
77E WIRE OR HOG RINGS
APPROX. 4' DEEP X 6" WIDE,
FILL TRENCH TO ANCHOR BOTT0A1 OF
CLOTH, COMPACT THOROUGHLY
T�-{PaIMP, Y SLT F>VCE
�.J STD. & SPEC. 3.05-2
67- C. Y./AC. DRY" STORAGE`
EXrsr.
GROUND DEWATERING
ELE V Df E
67 C. Y./AC.
YET' STORAGE
SEDIMENT CLEANOUT PCINT
TO 4 C. Y./AC) REDUCED
MINNUM STORAGE VOLUME
AND SEDIMENT STORAGE
ARIABLE
1.0'
ARE FABR/C, 14.5 GAUGE
W. 6" MAX. MESH SPACING
-TALL WIRE FENCE
VSH NTH THE GROUND
GROUND -� 67 CU. YD, /ACRE " VARIABLE+
EL£V. 4' MAx 67 CU. YD,/ACRE EXrsr.
(EXCA VA 7FD) 1-7L IFR CL 0TH GROUND
COARSE ELEV.
*SEE PLATE .3.IJ- 1 OF THE VA. AGGREGATE*- CLASS 1 R/PRAP
EROSION AND SEDIMENT CONTROL
HANDBOOK (1992) CUTLP'T CROSS SL 0770/
LENG
6 X OR,4/it/,gG AREA T�
COURSE AGGREGATE/
F/L TER
/ CLOTH r•-
EXCA IIA TED
AREA
**COARSE AGGREGATE SHALL BE 4ID0T f -T,, ZJ57 OR Z5
/5-,
CUTLET (PERSFEC77LT VEW)
ST TEMPORARY SEDMFE TRAP
STD. &SPEC. 3.13
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1°y
EROSION CONTROL NARRATIVE
PROJECT DESCRIPTION
' PETER JEFFERSON PLACE, LAKE I SITE IMPROVEMENTS INVOLVES THE
DISTURBANCE OF APPROXIMATELY 20 ACRES OF LAND TO CONSTRUCT A. 2+! -ACRE
LAKE AND THE CUT AND FILL ACTIVITY TO PREPARE THE LAKE DAM AND ROAD CROSSING
AND SEDIMENT BASIN STRUCTURE. THE SITE AREA IS MOSTLY OPEN PASTURE LAND ON
ROLLING HILLS THAT DRAIN TO WOODED SWALES THAT FEED HICKMAN'S BRANCH WHICH
OUTFALLS 3000 +I- FEET INTO THE RIVANNA RIVER.
THIS SITE FRONTS STATE ROUTE 250 WEST OF INTERSTATE 64, AND EAST OF STATE FARM
BOULEVARD. APPROXIMATELY 15.4 ACRES OF OFF SITE AREA DRAINS ONTO THIS SITE
FROM THE NORTH. A TOTAL OF 70.6 ACRES DRAINS TO THE PROPOSED TEMPORARY
SEDIMENT BASIN. THE STONE CONSTRUCTION ENTRANCE WILL BE ON ROUTE 250. A
WASH DOWN AREA SHALL BE PROVIDED TO MINIMIZE ANY DIRTIMUO FROM BEING CARRIED
ONTO THE PUBLIC RIGHT OF WAY.
F3lll�,
THE SITE PREPARATION AREA IS PREDOMINANTLY A RABUN (71C&D) CLAY LOAM
SOIL ALONG THE RIDGE TOPS THE SOIL IS DAVIDSON (23B) CLAY LOAM WITH
UDORTHENTS (88) IN THE LOWEST DRAINAGE SWALE AREAS. RABUN SOIL IS A MODERATE
TO SEVERELY ERODIBLE SOIL WITH MODERATE PERMEABILITY. DAVIDSON SOIL IS A
MODERATELY ERODIBLE SOIL WITH MODERATE PERMEABILITY.
CRITICAL AREAS:
THE EXCAVATIONFILL OPERATIONS AND POINT OF DISCHARGE OF THE
TEMPORARY SEDIMENT BASIN WILL BE DONE AT THE LOWER REACHES OF THE OUT FALL
DITCH AT HICKMAN'S BRANCH. THE SIDE SLOPES OF THIS DEEP DITCH ARE HIGHLY
EROSIVE. SPECIAL CARE MUST BETAKEN WHEN WORKING IN THIS AREA. SIDE SLOPE
STABILIZATION AND PIPE DISCHARGE ENERGY DISSIPATION AND DITCH BOTTOM
STABILIZATION WILL BE THE MOST CRITICAL AREA FOR POTENTIAL SOIL EROSION. ALSO,
THE CONSTRUCTION ENTRANCE AND VEHICLE WASH DOWN WILL BE IMPORTANT TO
MAINTAIN A DIRTIMUD FREE ASPHALT SURFACE ON ROUTE 250. ;THE CONTRACTOR SHALL
PROVIDE APPROPRIATE MAINTENANCE OF ENTRANCE TO KEEP ROADWAY CLEAN.
STORM WATER CONTROL:
66.7 ACRES OF AREA DRAIN TO THE PROPOSED LAKE. 51.3 ACRES OF THIS AREA IS
ON SITE AND MASTER PLANNED FOR CORPORATE OFFICE AND COMMERCIAL RETAIL BUILD
OUT. THE PROPOSED LAKE IS DESIGNED TO TAKE THE OVERALL DRAINAGE AREA AT
ULTIMATE DEVELOPMENT PER CURRENT MASTER PLAN. THE LAKE OUT FALL STRUCTURE
WILL RELEASE THE 10 YEAR POST DEVELOPED STORM WATER DISCHARGE AT THE 10 YEAR
PRE -DEVELOPED FLOW RATE THE OUT FALL CHANNEL WILL BE STABILIZED BY OUT FALL
HEADWALLS, GROUTED RIP -RAP AND JUTE MESH LINED DITCH SIDE SLOPES.
CONSTRUCTION SEQUENCE
1. THE SITE CONTRACTOR, ONCE RELEASED BY ALBEMARLE COUNTY
INSPECTIONS, SHALL INSTALL THE TEMPORARY STONE CONSTRUCTION
ENTRANCE WITH WASH DOWN AREA AND SILT TRAP #1.
2. TREE SAVE PROTECTION AND BARRIERS SHALL BE INSTALLED ALONGIAROUND
DESIGNATED TREE LIMITS. -
3. CONTRACTOR SHALL INSTALL SILT FENCING ALONG OUTER PERIMETER OF
PROPERTY LINE AND/OR TOE OF FILL SLOPE LIMITS.
4. SILT TRAPS #2 AND #3 SHALL BE INSTALLED AND CONSTRUCTION OF
TEMPORARY SEDIMENT BASIN CAN BEGIN. APPROPRIATE COHESIVE CLAY
MATERIAL TO BE USED FOR BERM FILL MAY NEED TO BE EXCAVATED FROM
ON SITE OR HAULED IN FROM OFF SITE. CONTRACTOR SHALL NOTIFY
ENGINEER OF BERM FILL SOURCE TO DETERMINE IF ANY MODIFICATION OF
EROSION CONTROL PLAN IS NECESSARY.
5. ONCE SEDIMENT BASIN AND SILT TRAPS ARE IN PLACE, INSTALLATION OF LAKE
DAM AND ROAD FILL CAN BEGIN WITH INSTALLATION OF STORM SEWER
SYSTEM ACCORDINGLY.
6. ALL AREAS OF CUT AND FILL SHOWN ON GRADING PLAN SHALL BE
COMPLETED WITH APPROPRIATE EROSION CONTROL MEASURES INSTALLED
ONCE EACH CONSTRUCTION TASK IS COMPLETED.
7. ALL DIVERSION DIKES AND DITCHES AND SILT FENCING ALONG TOP OF FILL
SLOPE SHALL BE INSTALLED.
8. ALL EROSION CONTROL MEASURES SHALL BE INSTALLED AND MAINTAINED PER
THE LATEST EDITION OF THE VIRGINIA EROSION AND SEDIMENT
CONTROLHANDSOOK
9. ENGINEER AND ALBEMARLE COUNTY INSPECTIONS SHALL BE NOTIFIED OF ANY
EXCESS DIRT MATERIALS TO BE STOCKPILED ON SITE TO MODIFY
EROSION CONTROL PLAN.
DETAILS OF CORRUGATED METAL
ANTI -SEEP COLLAR
�.H
. 1
+ T
+ T
�c Wuom wan Arr `.a"E SECTION B -B
ELEVATION OF UNASSEMBLED COLLAR
3. UNASSEMBLED COLLARS SNAIL BE MARKED BY
NOTES FOR COLLARS: PAINTING OR TAGGING TO IDENTIFY MATCHING
PAIRS.
1. ALL MATERIALS TO BE IN ACCORDANCE WITH 4. THE LAP BETWEEN THE TWO HALF SECTIONS
CONSTRUCTION AND CONSTRUCTION MATERIAL AND BETWEEN THE PIPE AND CONNECTING BAND
SPECIFICATIONS. SHALL BE CAULKED WITH ASPHALT MASTIC AT
2. WHEN SPECIFIED ON THE PUNS, COATING OF TIME OF INSTAWTION.
COLLARS SHALL BE IN ACCORDANCE WITH 5. EACH COLLAR SHALL BE FURNISHED WITH TWO
D TANK
SPECIFIICATIONS AND CONSTRUC710N MATERIAL L�GS FOR CONNECTING COLLARS TODIAMETER RODS WITH PIPE.
ANTI- VORTEX DEVICE DESIGN
H 6�1%S qAF I
° o
f o /
PLAN VIEW i
I I
SECTION A -A
BeR szE
I
ISOMETRIC
TO TOP AND ORIENTED PER-
T PE NDICULAR TO CORRUGATIONS.
.TOP IS -15 -GAGE CORRUGATED
METAL OR I/B" STEEL PLATE.
PRESSURE RELIEF HOLES MAY
BE OMMITTED, IF ENDS OF
'CORRUGATIONS ARE LEFT FULLY
OPEN WHEN THE TOP IS
ATTACHED.
CYLINDER IS_QiGAGE CORRUGATED
METAL PIPE OR FABRICATED FROM
1/w
STEEL PLATE.
NOTES:
I. THE CYUNDER MUST BE
FIRMLY FASTENED TO THE
TOP OF THE RISER.
2. SUPPORT BARS ARE WELDED
TO THE TOP OF THE RISER
OR ATTACHED BY STRAPS
BOLTED TO TOP OF RISER.
OVERALL EROSION CONTROL & DRARVAGE AlAr '
BASIN STORAGE VOLUME
ELEV.
AREA
INCR. VOL(cu. ft.)
CUMV. VOL.(cu. ft.)
407
0
0
0
410
5760
8640
8640
415
11,808
43920
52,560
420
20,448
80,640
133,200
425
32,150
131,520
264,720
430
48,992
202,880
467,600
SCALE 1=100'
9010 CMP ANT/-VORTIX TOP
12' MIN, 6010 CMP RISER P/P£
-� BERM TOP=43//0.00 CREST ELEV=424.7
25 YR. STOIPM ELEV�76
SPECIAL NOTE.
CONTRACTOR SHALL PROVIDE A COHESIVE
CLAY MATERIAL TO BE COMPACTED TO
952 PROCTOR DENSITY FOR DBER,��BACKF/CL MATERNAL AND COM, � 53'SHALL SE TESTED AND VER/Pj•SITE SO/LS ENG/NEER.42"0 CMP
NTI-SEEP COLLARS
RIP50'IDE
CL /, TYPE A' STONE 15 A MIN.
W/ FULL FILTER FABRIC BASE
XDRY_STORAGE ELEV.=424.7 14'ID PERFOR4TE0 DEWATE /NG P/PE
WET STO/7AGE ELEV.= ATTACHED TO 12" ORIFICE OPEN/NG /N
- ------ RISER F/L=419.7
4157
__CLEANOUT ELEV=4157_
\ BOTTOM=407.0
CONC. BASE ANCHOR
i
25• RISER 0 6010
A=19.6 ft 17=17.7' CONC. ANCHOR
d=10.5' 19.66/(172)=416 cu0 ft. 10.5' DA. x,2.5' TH/CKVOL==36=,59BYN432lbs. A=86.6 ft
h=25'
VOL. =216.5 cu. ft.
WT=216.5 (125) = 27,060 lbs.
27,060/21,590=1.25 factor of safety
BASIN DESIGN
ORA/NAGE AREA = 70.6 AC.
STORAGE VOLUME = 70.6 (134 cu. yd./ac.)=9460 cu. yd. (27 cu. ft.)=255,420 cu. ft.
P1.
iWIM
low
21,
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GRAPHIC SCALE
o So
eo
( IN FEET )
I inch = 40 ft.
72D3
SO/LS MAP
SCALE N.T.S.
511 o d Ipydro-1
p rpnTal 1 laglel 7raeuen<y
1 GiraYipn laonlTe 1 DaptT ; RtM {Noneaa
1
beptT
IPo1 enlSall T�
iaardneae froa2 14+coaYea Kona ra la
1 1 t 1
23a,)6.0
nevlaaon
i — i —
)6a
i
l —_ iyo,v---rIN1aT--IMeamace
719, T1c, 719, 1 I
71a, 7293, 72C3, I I
I 1 11 1
{ { 1
1
1
f I I I
7.3, 72e3, Tac, I I
I 1 1
1 1
7aaCvn3s--i
230—Davidson clay loam, 2 to 7 percent s'opes.
This deep, gently eloping, well drained soil is on narrow
to broetl convex ndgetops of Piedmont uplands.
Permeability end available water capacity are
moderate. Surface runoff is medium. The hazard of
erosion Is moderate. This soil has fair fifth. The subsgT
has low shrink -swell potentfei. The root zone extends to
a depth of 60 inches. The organic matter content is
moderate, and the natural fertility is medium. This soil
commonly is medium acid to strongly acid throughout,
but reaction in the surface layer is variable because of
local timing. Bedrock is generally at a depth of more than
5 feel
The low strength, the moderately permeable subsoil,
and the clayey texture of the subsoil are the main
limitations for nonfarm uses. The law strength limits use
of the soil for local roads and streets, and the clayey
subsoil limits excavations. The clayey, moderately
permeable subsoil limits the use of the soil for sanitary
facilities. Slope is a Un itatlon for playgrounds. The soil Is
Poor as a source of roadfili.
71C—Raburi clay loam, 7 to 15 percent slopes. This
deep, strongly sloping, well drained soil is on narrow
convex ndgetops and on convex side slopes.
Permeability and available wafer capacity are
moderate. Surface runoff is rapid. The hazard of erosion
la severe. This soil has good 111th. The surface layer Is
friable and easily tilled when moist, but It breaks up into
clods if the soil is tilled when too wet or too dry. The
subsoil has low shrink -swell potential. The root zone
extends to a depth of 40 inches or more. The organic
matter content is moderate, and the natural fertitily Is
medium
. This aoiI commonly is slightly acid to strongly
acid throughout, but reaction in the surface layer is
variable because of local liming. Bedrock is generally at
a depth of more than e0 inches.
Slope, Imo s(r ngfti, and clayey subsoil are the main
limitations for nonfwdn uses. Slope and the low strength
limit the use of this s:og for local roads and streets. Slope
and " clayey subsoil limit excavations. Slope and the
clayey subsoil limit use of the sail for sanitary landfills.
Slope is a limitation for recreational development. The
low strength and excess fines limit use of the soil as a
source of raadfill.
7113—Rabun clay loam, 15 to 25 percent slopes.
This dgep, moderately sleep, well drained soil is on
convex side slopes.
Permeability and available water capacity are
moderate. Sunace "w"t is rapid. The hazard of erosion
Is severe, This soil has good filth. The surface layer Is
moderately friable and easily tilled when moist, but It
breaks up Into clods If the soil Is tilled when too wet ar
too dry. The subsoil has low shnnk•awell potential. The
root zone extends to a depth of 40 inches or more. The
organic matter content is moderate, and the natural
fertility is medium. This soil Is slightly acid to strongly
acid throughout, but reaction In the surface layer is
variable because of local liming. Bedrock is generally at
a depth of more than 60 inches.
The slope and the clayey subsoil are the main
IimItalic S for nonfarm uses. Slope limits use of this sod
as a building site, as a site for most sanitary facilities,
and as a site for recreational areas. Slope and the
Clayey subsoil are limitations for sanitary landfills. The
law strength and excess fines limit use of the soil as a
source of roadfiil.
Be—Udorthents, loamy. This map unit is made up of
areas that have been used for cutting or filling during
grading for roads, housing developments, recreational
areas, quarries, and other similar uses. The areas
commoniy are imeguiar in shape and conform to property
boundaries. They range from 3 to about 50 acres.
Slopes mainly range from 2 to about 25 percent.
Sktewalls are nearly vertical in places.
Tha cuts are generally the steepest pan of this map
ung. The material exposed in these cuts Is generally
loamy and is very Strongly acid. It generally consists of
underlying material of the As,
Catoctin, Chester,
Cullen, Elioak, Hayesville. Merited, Myersville, Nason, or
Pabun soils. The filled areas generally consist of material
removed from the cuts.
Included with these soils in mapping are arees of soils
Ihat have not been appreciably altered by cutting and
filling and areas where bedrock la exposed. These areas
make up less than 15 percent of mapped areae.
Permeability ranges from moderately rapid to Slow.
The available water Capacity is low to moderate. Surface
runoff is medium to very rapid, and the hazard of erosion
I. moderate to very severe.
238
r
I/
U+GU 71-UU 2-1-uu 3-100 4700 5700 6-koG 7-1-00 8*00 9*00
470
468
466
464
462
460
458
456
454
452
450
448
446
444
442
440
438
436
434
432
430
428
426
424
422
420
418
416
414
412
410
408
406
404
402
400
398
396 DATUM ELEV
395.90
HEC -1 - MODIFIED PULS METHOD RESULTS
10 YEAR POST DEVELOPED INFLOW AND OUTFLOW
Discharge
(S)
Computed Hydrograph - Ncde2
/ Node2
50 / Nadel
0
14:0�30 75:30 76:00 �301�0077:30 78:00
Starting date/time (interval): OIMAYS7/14:00 (00:01)
100 YEAR POST DEVELOPED INFLOW AND OUTFLOW
Computed Hydrograph - Node2
400
300
Discharge / Node2
(cfs) 200
Nodet
Starffng date/time (inter 1): 01MAY97114:00 (00:01)
PRIMAR Y SPIL L WA Y ELI TFAL L STORM PEAK FLOW IINIE TO PEAK VOLUME MAX
STAGE
1
' 10 YR. 202 0 43.2 9.1 461.64 �_4 n
/'�•1•top s / 100 YR. 373.8 15.9 16.4
Hydrologic Calculations 162.0 42.0 16.4 962.9�wwi= �.7
Pre -developed conditions:
Stage - Storage - Discharge
Drainage area - 66.7 acres elevation Storage g discharge discharge discharge total outflow
standing pipe(weir) standing pipe(orifice) 14' spillway
Runoff Factor: 51.3 acres Open field C = 0.40 ft acre -ft cfs cfs cfs
cfs
^\ / ✓ ( ,� �` `��� (/ 12acres Buildings and grounds C = 0.70
/ \ \ 3.22 acres Pavement C = 0.95 460 0 0
460.2 0.588393 3.909541 25.60839 0 0
'•, ��% �� 0 3.909541
\ / , Total acreage = 66.7 acres Weighted C = G.49 460.41 182527 11.05785 36.21574 0 11.05785
460.6 1.782401 20.31457 44.35504 0 20.31457
i O , = 460.8 2.388015 31.27633 51.21679
Time of Concentration: OFF, = 300 R. @ 5 4 23.. minutes 0 31.27.71
@ 43.71 57.26211 0 43.71
CF, = 2200 ft. 4.4%= 5.0 minutes 461 2.999369
461.2
Total minutes 3.616463 57.45829 62.7275 0 57.45829
461.4 4.239297 72.40572 67.75344 0 72.40572
i f / = �3.0
461.6 4.867871 88.46282 72.43148
0 88.46282
461.8 5.502186 9Z 76.82516
�. ( I .�-� • \\ • I - 3.37 in/hr 105.5576 0 105.5576
70- 462 6.142241 123.6305 80.98085 0 80.98085
462.2 6.788036 142.6313 134.93343 20.1705 105.1039
Q,o = 110.0 cfs 462.4 7.439572 162.5166 88.71008 31.05451 119.7646
462.6 8.096849 183.2487 92.33238 t ... \ \ • V 43.4 135.7324
462.8 8.759868 204.7943 95.81784 57.05078 152.6686
Z, /
�; \ / i \✓ / t 463 9.428627 227.1238 99.18088 71.8922 171.0731
•
1 1 j j / / �� j� � , •� Post -developed conditions:
Ai /\ ( � / off-site drainage:
RunoffFaaor: 15.7 acres Light commercial, landscape C = 0.65 ARC WELD SUPPORT ANTI- VORTEX DEVICE
/ / OQ I ., SAPS i 0 STcCL
f I PATES STEEL PRESSURE RELIEF TOP STIFFENER /F REOU/RED
on-site drainage: PLA FES HOLES v/z' Du. ( J
\Un / � d /S 2-1/2"x 2-1/2" 1/4 i7NCLE WELDED
/ ' TO TOP AND ORIENTED RON
Runoff Factor: 26.1 acres Open field, landscape C=0.45 r�\ \ A A / END/CUL9R TO CORRUG4 ONS.
25.0 acres Roof and pavement C = 0.95 TOP /s vz cACE coRRucarED
ARC WELD 57EE_ PLATS / METAL OR 1/8" 57EEL PLATE.
TO 5�Tc2 BAND AROUND \ BE PRESSURE
LI ENDS OF
Total acreage = 66.7 acres Weighted C = 0.69 d ° �' " ° PRESSURE REL/EF HOLES MAY
- R/SER ,
lO7 8/S" BOLr PSN VIS CORRU177ED, I ARE LEFT FULLY
Tune of Concentration: OLFt = 300 ft. @ 5% = 13.2 minutes OPEN WHEN rHE TOP /S
5TE&L NO ATTACHED.
\� _ I, I Cft = 2200 ft. @ 4.4% = 2.7 minutes /lAB/S' BO INTO ter D
�+ 1
R ER 11 (TYP/C.AL) rACKWELO-
/ CONCRETE ALL AROUND CK/NOEI /S 14 48RI CORR FROM
�` Total t� = 15.9 minutes RISER H METAL PIPE OR FCAGE 7E0 FROM
00 1/8' STEEL PLATE.
''f •••/�_ ' - -r - ` �. I,o = 4.57 uilhr Ito. = 6.59 in/hr e - NorEs
�^Y-- -/ • \ ���' \' \ �f /} _ SPA CEBB R CONCRETE
CONCRETE 1. THE CYLINDER MUST SE
Qto - 207.5 CfS 373.$ CFS RISER SUPPORT REFAR AIM)
E R'SER FIRMLY FASTENED TO THE
QICa (NPI TOP OF THE R/SER.
SUPPORT BARS ATTACHMENT
s •� '�� \\\' T.' �ti: 2 SUPPORT BARS ARE WELDED
SECTION A -A IOM RIC TO ATHEFT TOP OF TSE RISER
-OVERALL DRAINAGE DIVIDEMAP
SOLTEDA To TTOP OFR ER.
SCALE' 1 00' 3 AN77-VORTEX DE✓/CE /S TO 5/TUM/NOUS
COA7FD.
N
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