SW8081202_HISTORICAL FILE_20110804

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. I SW8 0?-) � 2o'2_-
DOC TYPE
DOC DATE
❑ CURRENT PERMIT
❑ APPROVED PLANS
[21 HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
wl1 0�6 o-A
YYYYMMDD

NCDENR
North Carolina Department of Environment and Natural Resources
4+ Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
August 4, 2011
Commanding Officer c/o Carl Baker, Deputy Public Works Officer
MCB Camp Lejeune
Bldg 1005 Michael Road
Camp Lejeune, NC 28547
Subject: Approved Plan Revision
Truck Company Maintenance Operations Complex P-1223
Stormwater Project No. SW8 081202
Onslow County
Dear Mr. Baker:
Dee Freeman
Secretary
On August 2, 2011, the Wilmington Regional Office received a plan revision for
Stormwater Management Permit Number SW8 081202. The revisions include the
relocation of the emergency spillway for the infiltration basin from the southeast berm to
the northeast berm. It has been determined that a formal permit modification is not
required for the proposed changes. We are forwarding you an approved copy of the
revised plans for your files. Please add the attached plans to the previously approved
plan sheets.
Please be aware that all terms and conditions of the permit issued on March 6,
2009, remain in full force and effect. Please also understand that the approval of this
revision to the approved plans for the subject State Stormwater Permit is done on a
case -by -case basis. Any other changes to this project must be approved through
this Office prior to construction. The issuance of this plan revision does not preclude
the permittee from complying with all other applicable statutes, rules, regulations or
ordinances which may have jurisdiction over the proposed activity, and obtaining a
permit or approval prior to construction.
If you have any questions concerning this matter, please do not hesitate to call me at
[phone].
Sincerely,
C"—tvu qjs-��
Christine Nelson
Environmental Engineer
GDSlcam S:1W0SIStormwater\Permits & Projects120081081202 HD12011 08 permit_pr 081202
cc: Bryan Dick, AECOM
Wilmington Regional Office
Wilmington Regional Offce
127 Cardinal Drive Extension, Wilmington, North Carolina 28405
Phone: [phone] FAX: [phone] Customer Service: 1-877-623.6748
Internet: www.ncwaterquality.org
An Equal Oppodunily 4 Affirmative Action Employer
One
NorthCarolina
Naturally

Date Received
Fee Paid (express only)
Permit Number
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT PLAN REVISION APPLICATION FORM
This form may be photocopied for use as an original
I. GENERAL INFORMATION
1, Stormwater Management Permit Number: SW8 081202
2. Project Name: P1223 Truck Company Maintenance Operations Complex MCB Camp Lejeune
3. Permit Holder's name (specify the name of the corporation, individual, etc.):
Carl Baker MCB Camp Lejeune
4. Print Owner/Signing Official's name and title (person legally responsible for permit):
Carl Baker, Deputy Public Works Officer
5. Mailing Address for person listed in item 2 above:
Bldg 1005 Michael Rd.
City:MCB Camp Lejeune State:NC Zip:28547
Phone: (910 ) 451-2213 Fax: (910 ) 451-2927
Email:carl,h,bake « smc.mil
II. PLAN REVISION INFORMATION
1. Summarize the plan revision proposed (attach additional pages if needed):
The infiltraton basins emergency spillway with level spreader lip will be relocated from the Southeast berm to
the Northeast berm. All dimensions and elevations will be matched and the spillway will still outlet to the
same roadway ditch.
III. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the DWQ Office that issued the permit.
1. Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
• Original & 1 copy of the Plan Revision Application Form
• Two (2) copies of revised plans (must be revisions of original approved plan sheet(s))
If applying for Express review (only available in 20 coastal counties):
• Application fee of $500.00 (made payable to NCDENR)
VI. APPLICANT'S CERTIFICATION
Plan Revision form Rev 13Ju1y2010 Page I of 2
RECEIVE D
AUG o 2 2011
BY:

.11, (print or hjpe name of person listed in General Information, item 3) Carl Baker
certify that I have authorized these plan revisions and that the information included on this plan revision
application is, to e best of my kO vledM, correct and complete.
Signature:
Date: / — l il-//
FAUG
IVED
Plan Revision Form Rev Muly2010 Page 2 of 2 2 2011

Date Received Fee Paid (ex ress onl) Permit Number
State of North Carolina - I
Department of Environment and Natural Resources 1
Division of Water Quality
STORMWATER MANAGEMENT PERMIT PLAN REVISION APPLICATION FORM
This form may be photocopied for use as an original
L GENERAL INFORMATION
J. Stormwater Management Permit Number: SW8 081202
2. Project Name: P1223 Truck Company Maintenance Operations Complex MCB Camp Lejeune
3. Permit Holder's name (specify the name of the corporation, individual, etc.):
Carl Baker, MCB Camp Lejeune
4. Print Owner/Signing Official's name and title (person legally responsible for permit):
Carl Baker, Deputy Public Works Officer
5. Mailing Address for person listed in item 2 above:
Bldg 1005 Michael Rd.
City:MCB Camp Lejeune _ State:NC Zip:28547
Phone: (910 L 451-2213 Fax: (910 ) 451-2927
Email:[e-mail]
II. PLAN REVISION INFORMATION
1. Summarize the plan revision proposed (attach additional pages if needed):
The infiltraton basins emergency spillway with level spreader lip will be relocated from the Southeast berm to
the Northeast berm. All dimensions and elevations will be matched and the spillway will still outlet. to the
same roadway ditch
III. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the DWQ Office that issued the permit.
1: Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
• Original & 1 copy of the Plan Revision Application Form
• Two (2) copies of revised plans (must be revisions of original approved plan sheet(s))
If a12121Ying for Exl2ress review(only available in 20 coastal counties):
• Application fee of $500.00 (made payable to NCDENR)
VI. APPLICANT'S CERTIFICATION
Plan Revision Form Rev 137uly2010 Page I of 2
p,F (- T,—
AUG o 2 Zall
BY:

`• 1, (print or type name of person listed in General Information, item 3) CarI Baker
certify that I have authorized these plan revisions. and that the information included on this plan revision
application is, toXe)best of my kr*ledg�, correct and complete.
Plan Revision Form Rev 13July20t0 Page 2 of 2
Date:
--/--- 1V---zz
RECEIVED
AUG 0 2 2011
BY:

AECOM
701 Corporate Center Drive, Suite 475, Ra4eigh, NC 27607
T +919.854.6200 F +919.854.6259 www.aecom.corn
I'F�d�7,
July 18, 2011
Ms, Christine Nelson
NCDENR - DWQ
127 Cardinal Drive Extension
Wilmington, NC 28405
Subject: Stormwater SW8 081202 Plan Revision
Hadnot Point Road Improvements
Camp LeJeune, North Carolina
Dear Ms. Nelson,
AECOM is currently performing civil engineering services for Marine Corps Base Camp Lejeune in
Onslow County, NC including the construction and widening of Hadnot Point roads. As part of these
services, we are helping the Base to obtain necessary environmental permits, including stormwater
management. Pursuant to our multiple meetings and phonelemail conversations, this letter is being
submitted to respectfully request approval of a Stormwater Management Permit Plan Revision for
stormwater permit number SW8 081202.
The Hadnot Point Road Improvements consists primarily of improving the Holcomb Blvd./McHugh Blvd.
Round About, widening the existing Louis road and the addition of some sidewalks. The proposed
improvements will cover the existing roadway ditch along the Southwest portion of the existing infiltration
basin. This project shall take place within the established military reservation of Camp Lejeune, North
Carolina. The stormwater plan revision consists of relocating the existing infiltration basins emergency
spillway with level spreader lip from the Southwest berm to the Northeast berm. All dimensions and
elevations will be matched and the spillway will still outlet to the same roadway ditch.
Two sets of the revised plans and the original as well as one copy of the Plan Revision Application Form
are included with this letter.
At your earliest convenience, please review this submittal and forward us a copy of your determination for
our files. If you have any questions or require additional information, please feel tree to contact me.
Yours sincerely,
.S.� ,� 'Ll
Bryan M. Dick, P.E., P.H.
cc: David Towler, P.E. Public Works, Camp Lejeune
Gil Burnet, P.E.
Project File
a
z

O0 2— For DENR ONLY l
` Re
©," North Carolina Department of Environment and
_ Natural Resources, VS
ubmit,
�� Request for Express Permit ReviewTime::
NCDENR �L.
Confirm:
FILL-iN all the information below and CHECK the Permit(s) you are requesting for express review. FAX or Email the completed form to Express
Coordinator along with a completed DETAILED narrative, site plan (PDF file) and vicinity map (same items expected in the application package
of the project location. Please include this form in the application package.
• Asheville Region -Alison Davidson 828-296-4698;alison.davidson apncmail.net
• Fayetteville or Raleigh Region -David Lee 919-791-4203; daviddeeCdncmail.net
• Mooresville & -Patrick Grogan 704-663-3772 or gatrick.grogan ot7.ncmail.net
• Washington Region -Lyn Hardison 252-946-9215 or lyn.hardison()ncmail.net
• Wilmington Region -Janet Russell 910-350-2004 or ianet.russella)ncmail.net
!VOTE: Project application received after 12 noon will be stamped in the following work day.
Enter Related SW
Permits of request
SW
SW
SW
SW
SW
Project Name: P1223 TRUCK COMPANY MAINTENANCE OPERATIONS COMPLEX County: ONSLOW
Applicant: COMMANDING OFFICER MARINE CORPS BASE Company: CAMP LEGEUNE. NC
Address: 1005 MICHAEL ROAD City: CAMP LEGEUNE, State: NC Zip; 28547-_
Phone: [phone], Fax: _ _ �, Email: @_
Physical Location:MCB CAMP LEJEUNE
Project Drains into SEE ATTACHMENT waters - Water classification see attachment (for classification see-
http:llh2o.enr.state.nc.uslbims/repogs/reporisWB.htmi
Project Located in WHITE OAK River Basin. Is project draining to class ORW waters? N , within Y2 mile and draining to class SA waters N or within 1 mile
and draining to class HOW waters? N
Engineer/Consultant: BRYAN_M. DICK PERH Company: AECOM FED
Address: 701 CORPORATE CENTER DRIVE SUITE 475 City: RALEIGH,,Slate: NC Zip: 27607
Phone: [phone], Fax: [phone], Email: bryan.dick aecom.com 2-
@ J�L�)i4011
SECTION ONE: REQUESTING A SCOPING MEETING ONLY
❑ Scoping Meeting ONLY ❑ DWO, ❑ DCM, ❑ DLR. ❑ OTHER:
SECTION TWO: CHECK ONLY THE PROGRAM (S) YOU ARE REQUESTING FOR EXPRESS PERMITTING
❑ 401 Unit ❑ Stream Origin Determination: _ # of stream calls — Please attach TOPO map marking the areas in questions
ElIntermittentiPerennial Determination; —# of stream calls — Please attach TOPO map marking the areas in questions
❑ 401 Water Quality Certification ❑ Isolated Wetland (_linear ft or _acres)
❑ Riparian Buffer Authorization ❑ Minor Variance ❑ Major General Variance
®'State Stormwater ❑ General ❑ SFR, ❑ SFR < 1 ac. ❑Bkhd & Bt Rmp, ❑ Clear & Grub, ❑ Utility ❑ Other
❑ Low Density ❑ Low Density -Curb & Gutter —
# Curb Outlet Swales ❑ Off -site [SW (Provide permit #)]
❑ High Density -Detention Pond _# Treatment Systems ❑ High Density -Infiltration — #Treatment Systems
❑ High Density -Bio-Retention _ # Treatment Systems ❑ High Density —SW Wetlands _ # Treatment Systems
ElHigh Density -Other _ # Treatment Systems / ® MOD:❑ Major ❑ Minor ® Plan Revision ❑s Redev. Exclusion SW 8081202 (Provide permit #)
❑ Coastal Management ❑ Excavation & Fill ❑ Bridges & Culverts ❑ Structures Information
❑ Upland Development ❑ Marina Development ❑ Urban Waterfront
❑ Land Quality ❑ Erosion and Sedimentation Control Plan with _ acres to be disturbed.(CK # (for DENR use))
SECTION THREE — PLEASE CHECK ALL THAT IS APPLICABLE TO YOUR PROJECT (for both scoDina and express meeting reauest
Wetlands on Site ® Yes ❑ No Buffer Impacts: ® No ❑ YES: _acre(s)
Wetlands Delineation has been completed: ❑ Yes ® No Isolated wetland on Property ❑ Yes ® No
US ACOE Approval of Delineation completed: ❑ Yes ® No 404 Application in Process wl US ACOE: ❑ Yes ❑ No Permit
Received from US ACOE ❑ Yes ® No
•+*++*++ss+ss*+++*******s*****s++*****s+***s***+***s**s*ForDENRuse
Only*.**+.++*+*++*s*******s****s*r*s*+*+****+++s++.+*++*+*++*+++
Fee Split for multiple permits: {Check# ) Total Fee Amount $
SUBMITTAL DATES
Fee
SUBMITTAL DATES
Fee
LAMA
$
Variance (❑ Maj; ❑ Min)
$
SW ( HD, ❑ LD, ❑ Gen)
$
401:
1
$
LQS
$
Stream Deter,_
$
NCDENR EXPRESS March 2009

s':�F-L- J123
�,j cn o`P a `.� M

A=COM
SW8 081202 P1223 TRUCK COMPANY MAINTENANCE COMPLEX - PLAN REVISION
Project Narrative
The existing infiltration basins emergency spillway with level spreader lip, permitted under SW8 081202,
will be relocated from the Southeast berm to the Northeast berm. All dimensions and elevations will be matched
and the relocated emergency spillway will still outlet to the same roadway ditch. The relocation will not affect the
permitted drainage area or permit boundary. This emergency spillway relocation was discussed with the central
and regional DWQ offices and it was determined that a plan revision would be necessary for the proposed
relocation of the existing emergency spillway.
t - -VED
JUL 0 7 2011
^ -r.

Ja. on�I—
'-'sc, Camp Lejeune Main Gate
24
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' BREWSTER 806LEV � t ;
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2011
q t per_• BfR .r" t
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' �� [ti � 1 /r� ✓G�j'4�1�f�'P �C--, 7° C `+�:•�
�Qni�,` � J
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Project Location
! 1
Camp Lejeune South Gater�,
1 //
PROJECT�SITE rw \
• i �r PQ ♦ 1 �
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c
Say
la Ga e Ler1d
17 f
it
r+ r t.-; �� �,_;;�,
Atlantic
lJ }
Ferry} ��
.Ocean
Sneads ; _ �,, '�
T . .� 47
Legend Location Map
PAVED o a ' 2P1223 Truck Company
UNPAVED Miles A:COM Maintenance Operations
—�--
Complex
Camp Lejeune MCB
Onslow County, NC

CN Comm. No.: NC2861 5 2009
Crump Le,
jeune, North Carolina
P1223 Truck Company Maraterrace Operations Complex
CIVIL CALCULATIONS
Stormwater Management Permit Submittal
4 Feburary 2009
l�{5„Ill lfl,ll,!/
iSS1o'. 'y
o �
33574 =_
= ot•aY•o1�
'''r101ffl11lllpp, � R .
1_.n�inc:cr (v�: Josh 1-Iursa, P.1�.
isrm Rupert, 17.1.
NXIA"' tf Bork, 1..I.
Chris Sczlall, I :.1.

TABLE OF CONTENTS
5 2009
1.0 PROJECT INFORMATION.. .......................................................................................... I
1.1 E11STING CO NDITIONS.................................................................. 1
1.2 Pimli_o, DESCRIPTION ........................................................................
1.3 G17OTECHNICAL INV STIGATION......................................................................................... ?
2.0 DESIGN APPROACH.......................................................................................................2
2.1 S'1'()icm DiZ,�iNAG1.? I'IPING........................................................... ........2
3.0 WATER QUALITY ANALYSIS.......................................................................................3
4.0 WATER QUANTITY ANALYSIS...................................................................................3
4.1 PRL17E \ I L( >P\11 \`r Cc )NDYFIONS..........................................................................................3
4.2 .......................................................................................4
APPENDIX A: STORM SYSTEM CALCULATIONS AND MAPS
APPENDIX B: GEOTECHNICAL REPORT

P1187 MARSOC Fire Station CN Comm. No. 2682.2
Slonilwatcr Calculalicros >y c-3 0 5 2009 Clark*Nexsen
1.0 PROJECT INFORMATION - -
1.1 PROJECT LOCATION AND EXISTING CONDITIONS
The project site for the PI 223 Truck Compcuty Maintencrrrce Operations Complex is located
at Camp Lejeune. The site is bounded by Michael Road to the north, Gum Road to the west,
and Louis Road to the south. The east side of the construction limits is bounded by an
adjacent project that %will construct a BMP at the site limit. The site consists of 11.70 acres of
partially wooded, undeveloped land that has been used for pedestrian troop operations and
storage. Existing grade elevations generally range from about 27 feet MSL in the northwest
corner of the site to a low of 1 1 feet MSL on the south side of the site. The existing site is
forty seven percent (47%) impervious.
1.2 PROJECT DESCRIPTION
The put7)ose of this project is to provide a single story Truck Company Maintenance
Operations Complex at the Marine Corps Base at Camp Lejeune. This project will be similar
to a motorpool that will service large vehicles and provide on site parking for these
operations. The site work will include two entrances to a 165 space POV parking lot fi-om
Michael Road. Service access for the large vehicles based at this facility wil] be provided
through a separate entrance fi-om Michael Road southwest of the POV parking lot entrance.
The service entrance will provide space for the vehicles to stage and not interfere with traffic
on Michael Road. Sidewalks will be provided for pedestrian access onsite. Approximately
l 1.7 acres will be disturbed during this construction period. This project will meet minimum
anti -terrorism force protection standards.
The total drainage area for the site is 11.02 acres. The pre -development conditions are 47%
impervious whereas the post -development conditions are 80% impervious.
The project site has one outfall as indicated on the drainage area maps. The site drains to an
existing 24" RCP located along the southern side of the site between the thvo storm water
BMPs. The pre -development and post -development drainage area maps and storm system
calculations are included in Appendix A.

P1187 MARSOC Fire Station
Sumim-ater Calculations
FIED 0 5 2009
1.3 GEOTECI-INICAL INVESTIGATION
CN Comm. No. 2682.2
Cl�rek*Acxscn
Gccltcchilic;tl investigaticm was perfnrnlal by GcoLnvirr�nnlental Resources, ]ne. (GE�R).:1
cope of the Gcotechnical report is included in Appendix C.
2.0 DESIGN APPROACH
2.1 STORM DRAINAGE PIPING
Permanent storm drainage piping systems are designed for a 10-year storm event using the
Rational 1\ allod for rainfall analysis. Rainfall intensity values were taken from the NOAA
websitc. Runoff cocfftciel1ts are based on the folloxing values:
Description Runoff Coefficient, C
Pavcd and Roof Arcas 0.95
U111mp1•ovu-1 Arcas 0.35
Using 1-laestad StormCAD version 5.5, the pre -development and pest -development storm water
collection system vas modeled. An analysis of the hydraulic grade line for the 10-year design
rainfall event found the existing and proposed structures' ring elevations to be above the .eater
level. See Appendix A for detailed info rniation of the pre -developed and post -developed
andysis.
The proposed system of pipes and inlets will collect storin water runoff front splash blocks for
roof 1•1.1114f, overland flow front the parking area, and sonic lawn areas. The proposed collection
system "will outfall into one infiltration basin that is designed to contain ,.p inches of rainfall and
one. wet detention basin that is designed to contain 1.5 inches of rainfall. The infiltration basin is
also designed to infiltrate the 10 ycar-24 hour storm event routed through it. The wet detention
basin is designed to drawdown the temporary storage volume of a 1-inch rainfall event in 2 days.
An emergency is also designed for each of the basins.

P1187 MARSOC Fire Station CN Comm. No. 2682.2
Swrmwatcr Calculaiirms 0 Clark*Ncxscn
3.0 WATER QUALITY ANALYSIS
The calculation of the infiltration basin, "vct detention basin, filter strips, and level spreaders are
based oil the North Carolina Department of I_ ilvironment and Natural ResourceS (NCDENIZ),
Stormwatcr Best tA4atlagemcnt Practices (BMP) iNlanual, September-, 2007. According to the
NCDLNR Design Cluide, the inhlrration basin srorniwater rt-eatmcnt sestet» is designed to
reniove 85 percent of the average annual post developnlerit total suspended solids (1'SS), 30
percent of the average annual post development total nitrogen (I'N), and 35 percent of the
average annual post dcvelopnient total phosphorus (11)), by inipleni(nting Best iManagemcrtt
Prnetiees (l3M11"s). According to the NCDLNR Design (:wide, the .vet detention basin
stormwater treatment sysreni is designed to remove 85 percent of the average annual post
development total suspended solids (I"SS), 25 percent of the average annual post development
total nitrogen (1'N), and 40 percent of the average, annual post development total phosphorus
(IT), by implenienting Best Nbliagemcnt Practices (13A11''S).
4.0 WATER QUANTITY ANALYSIS
'1 he'. lrlfilrrflrion basin touting vas performed using the triangular hydrr:)graph storage estimation
niethod in the: Hvdroflo-w Hydrographs 2009 computer program. The analysis indicates than the
to tat site post devclopment condition peak runoff for the 1-year, 2-year, 10-year, 25-ycar and
100- •car design storrrls is less than the predevelopmcnt condition.
4.1 PREDEVELOPMENT CONDITIONS
7'he rotal development area is 11.70 acres. The site drains to the cast and ultimately into the New
River of the white Oak basin. The table below suniniarizes the predevc.lopnient conditions
peal: runoff:
3

P1187 MARSOC Fire Station 'L 5 2009 CN Comm. No. 2682.2
Storinwater Calculatiams ClarkO� csccn
Predevelopment Condition Peak Runoff Summary
1-year
2-year
10-year
25-year
100-year
Peak
Peak
Peak
Peak
Peak
Runoff
Runoff
Runoff
Runoff
Runoff
(cfs)
(cfs)
(cfs)
(cfs)
(cfs)
Total Existing Drainage
Area Runoff
3i)•58
3ti.2G
47.8G
54.17
G4.02
4.2 POST DEVELOPMENT CONDITIONS
'1'hc post development Site c017611Ucs to drain from North to South to the proposed infiltration/
wet detention basins. All built apon area (13Ur1) is captured and treated at the 2 13NIPs. The
method of collveN7a11ce is a piped s\lstem that Includes drop and curb inlets. Details are provided
on the plans and storm sN,stcm Sizing and basin routing; calculations are. provided in Appendix
A. The table below summarizes the post development conditions peak runoff.
Post development Condition Peak Runoff Summary
1-year
2-year
10-year
25-year
100-year
Peak
Peak
Peak
Peak
Peak
Runoff
Runoff
Runoff
Runoff
Runoff
(cfs)
(cfs)
(cfs)
(cfs)
(cfs)
Drainage Area #1
13.91
16.38
21.62
24.47
28.92
Drainage Area #2
2 9.3 8
34.84
45.99
52.06
61.52
Total Post Development
Condition
43.19
51.22
67.61
76.53
90.44
The anahr,"is shows fl decrease ill post development runoff. 1•he table below, summarizes the
total predcvelopment and post development runoff for the project.
4

P1187 MARSOC Fire Station I FED p 5 2009 f CN Comm. No. 2682.2
Storillwa c. Calculfltlolls Clork*Ncsscn
1-year
2-year
10-year
25-year
100-ycar
Peak
Peak
Peak
Peak
Peak
Runoff
Runoff
Runoff
Runoff
Runoff
(cfs)
(cfs)
(cfs)
(cfs)
(cfs)
Total Prcdcvelopnient
30.58
36.26
47.86
54.17
64.02
Runoff
Drainage Area #2
29.38
34.84
45.99
52.06
61.52
Net Difference in Runoff
-1 2
-1.42
-1.87
-2.11
-2.5

APPENDIX A
Storm System Calculations And Maps

FLU 0 5 2009
DRAINAGE AREA DESIGN SHEET
DATE: 1121/2009 SHEET 1 OF 4
PROJECT: Truck Company Maintenace Operation Complex DESIGN BY: JTR
PROJECT NO.: 2862 CHECKED BY, JH
DESCRIPTION: Sub -Basin Drainage Area Analysis
f DRAINAGE AREA 1 Infiltration Basin
Post Develo ment
C
A Ift7
2
Impervious Surface
0.95
131.4244
M3.02
Pervious Surface
0.35
42 700
6
7
8
Weighted
C
0.80
Total Area
174.124
4.00
!alatatnALea
131, 224
3.02
Percent Impervious 75 5%
Q = CIA
i = 7.2 irUlr
C = Weighted C
A = Total area in acres
Q = 23.11
Volume Runoff to be Controlled From 3.0" Storm
Rv=0.05+0.009{I) {Simple Method,
Scheuter)
I=: 75.5 Percent Impervious
Rv= 0.73 Runoff Coefficient
V=P'Rv'Ad
P= 3,0 in
Design Rainfall
V= 0.729 ac-ft
Volume To Be Treated
V=1 31,747 ft'
Volume To Be Treated
A= 1,740 fl'
Area of Treatment Device
D= 2.50 ft
Pool Depth
V= 34,330 ft3
Volume of Treatment
14.50 ft
Seasonal High Water Table Elevation
16.50 It
Bottom of Treatment Device
19.00 ft
Water Suface Elevation
Drawdown Calculation
V= _ 31.747 ft3
Volume To Be Drawn Down
A= 15,638 ft'
Area of Treatment Device
k= 6.60 irdhr
Most Restrictive Infiltration Rate
t= 5 hrs
Drawdown Time
t= 0.2 days

FLED 0 6 ZU09
DRAINAGE AREA DESIGN SHEET
DATE, 112112009 SHEET 2 OF 4
PROJECT: MARSOC Firestation DESIGN BY. JTR
PROJECT ND.: 2862 CHECKED BY; JH
DESCRIPTION: Sub -Basin Drainage Area Analysis
Post Development
C
A fft'
A ac
2
Impervious Surface
0.95
272,833
6.26
4
Pervious Surface
0.35
33,008
0.76
6
7
8
,Weighted C
Q.89
Total Area
305,841
7.02
I pervious Area
272.833
6.26
Percent Impervious 89,2%
Q=CiA
i = 7.2 inlhr
C - Weighled C
A - Total area in acres
lam 44,75
Volume Runoff lobe Controlled From 1.5" Storm
Rv-0.05+0.0i {Simple Method, Scheuler}
I= 89.2 Percent Impervious
Rv= 0.85 Runoff Coefficient
V=P'Rv'Ad
P= 1.5 in
Design Rainfall
V= 0,749 ac-ft
Volume To Be Treated
V= 32,605 ft3
Volume To Be Treated
A= 19.243 h'
Area of Treatment Device
D= 4.00 h
Pool Depth
V. 59.A03 It,
Volume of Treatment
16 00 It
Seasonal High Water Table Elevation
13,00 ft
Botiom of Treatment Device
18,00 ft
Water Suface Elevation
Drawdown Calculation
V= 32.605 ft'
Volume To Be Drawn Down
A= 19,243 it'
Area of Treatment Device
k= 5.60 iNhr
Most Restrictive Infiltration Rate
t= 9 1
Drawdown Time
t= 0.4 days

Require Volume To Control The 1" Storm
F�.3 0 5 '1009
RUNOFF COEFICIENT (RV): STORM RUNOFF (IN) / STORM RAINFALL (IN)
PERCENT IMPERVIOUS (I): DRAINAGE AREA (AC) / IMPERVIOUS PORTION OF DA (AC)
RV=.05+.9* (I)
_ .05 + .9 * (.8921)
_ .85289 IN/IN
REQUIRED VOLUME FROM 1" OF RUNOFF = (DESIGN RAINFALL) * (RV) * (DRAINAGE AREA)
V = 3630 * (1") * (.85289) * 7.021
= 21,737 FT'
PROVIDED VOLUME FROM 1" OF RUNOFF = 27,318 FT 3
VOLUME PROVIDED > VOLUME REQUIRED
SURFACE AREA CALCULATIONS
REQUIRED ORIFICE DIAMETER FOR 2-5 DAY DRAW DOWN
TEMPORARY POOL VOLUME = 27,318
HEIGHT OF TEMPORARY POOL = 1.0 FT
DRAWDOWN TIME = 2 DAYS OR 172,800 SEC
FLOWRATE = 21,737 CF /172,800 SEC = .1258 FT3/SEC
ORIFICE COEFFICIENT = 0.6
AREA = (Q/C) / (2 * G * H/3
_ (.1258/.6) / (2 * 32.2 * 1/3
= 0.0453 FT
= 6.52 IN'
DIAMETER = V(AREA * 4) / n
_ (6.52 * 4)/rr
= 2.88 INCHES
= USE 2.0 INCHES FOR ORIFICE SIZE

Waiving Requirement for Vegetated Filter For The Infiltration Basin
10 YR - 24 HR 4 6.85 IN -> .571 FT
DRAINAGE AREA = 174,240 SF '
VOLUME OF RAIN TO BASIN FROM STORM EVENT = 10 YR -- 24 HR * DRAINAGE AREA
= .571 FT * 174,240 SF
= 99,462 CF
INFILTRATION RATE = 6.6 IN/HR --> USE 3.3 IN/HR
3.3 IN/HR * 24 HR = 79.2 IN
= 6.6 FT
BOTTOM AREA OF BASIN = 11,905 SF
INFILITRATION BASIN INFILTRATION CAPACITY FOR 24 HR PERIOD
6.6 FT * 11,905 SF = 78,573 CF
STORAGE VOUME PROVIDED = 34,330 CF
BASIN CAPICITY = RAINFALL VOLUME - (BASIN STORAGE + INFILTRATION CAPACITY)
BASIN CAPICITY = 99,462 - (34,330 + 78,573)
= -13441 CF
NEGATIVE INDICATED EXCESS CAPACITY FOR 10 YR AND 24 HR STORM EVENT.
F tE3 0 5 2009

Channel Report
Hydraflow Express Extension for AutoCADO Civil M 2009 by Autodesk, Inc.
Wednesday, Feb 4 2009
15 2009
Swale 1
Triangular
Highlighted
Side Slopes (z:1)
= 5.00, 5.00
Depth (ft)
= 0.89
Total Depth (ft)
= 1.00
Q (cfs)
= 9.240
Area (sqft)
= 3.96
Invert Elev (ft)
= 19.00
Velocity (ftls)
= 2.33
Slope (%)
= 0.69
Wetted Perim (ft)
= 9.08
N-Value
= 0.030
Crit Depth, Yc (ft)
= 0.74
Top Width (ft)
= 8.90
Calculations
EGL (ft)
= 0.97
Compute by:
Known Q
Known Q (cfs)
= 9.24
Elev (ft) Section
21..00
20.50
20.00
19.50
19.00
18.50
Depth (ft)
2.00
1.50
1.00
0.50
MALid
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