NCG140371_Regional Office Historical File Pre 2018

Q Michael F. ]Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department 9f t cl Natural Resources
�i wzau
Rns Director
Quality
7
July 13, 2007
Mr. Milton Lane i
ESH Director
APAC Southeast
PO Box 127
Greenville, SC 29602"A IPEJR, k 1.1 t i
Subject. General PermitNo. NCG140000
APAC Southeast
COC NCG140371
Mecklenburg County
Dear Mr. e:
herewith the subject certificate of coverage to discharge under the subject state - NPDES general permit. This
pertnit is issued pursuant to the requirements of North Carolina General Statute 14 -215.1 and the Memorandum of
Agreement between North Carolina and the US Environmental Protection Agency dated May 9, 1994 for as
subsequently ended.).
Phase tape notice that this certificate of coverage is not transferable except after notice; to the Division of
Water Quality. The Division of Water Quality may require modification or revocation and reissuance of the
certificate of coverage. Please also note the requirement to have a Stormwater Pollution Prevention Plan and to
comply with the cutoff concentrations listed in the permit.
This permit does not affect the legal requirements to obtain other permits which may be required by the
Division of Water Quality or permits requiredd by the Division of Land Resources, Coastal Area. Management Act
or any other federal or local governmental permit that may be required.
If you have any questions concerning this permit, please contact Melly Johnson at telephone number 919)
' -50 3 ext. 376,
Sincerely,
ORIGINAL
8RAD,
for Coleen H. Sullins, Director
cc:
"e!T1en"burggWC"oun"tyDEVP,- Water Quality, 700 North Tryon Street, Charlotte, NC 28202
Mr. Adam Gribb, RTP Environmental, 1900 South Highway 14, Suite 4B, Greer, SC 29651
Central Files
Stormwater Permitting Unit Files
en: Certificate of Coverage
ow
1�Carci
i'c
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet: mmy-n-ew-aterqualiiv.or Location: 512 N. Salisbury St. Raleigh, NC 27604 Fax [phone]
An Equal Opportunity/Affirmative Acton Employer — 50% Recyclecil 0% PostConsumer Paper

PPPPP'"
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NO. NCG 140000
CERTIFICATE OF COVERAGE No. NCG140371
TO WATER DISCHARGES
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-21 .1, other lawful
standards and regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended,
PC Southeast
is hereby authorized to discharge'stonnwater from a facility located at
AC Southeast
9498 Treyburn Drive
Charlotte
Mecklenburg County
to receiving waters designated as Dixon Branch, a class C water in the Catawba River Basin, in
accordance with the effluent limitations, monitoring requirements, and other conditions set forth.
in Parts 11,1I, HI,1V, V, and VI of General Permit No. NCG 14 000 as attached.
This certificate of coverage shall become effective July 13, 2007.
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
sL_ 0 Y
Signed this 13'h day of July 2007. �.��,� � . � ..� ENNETT
for Coleen H. Sullins., Director
Division of "Water Quality
By the Authority of the Environmental Management Commission

0C A Michael E. Easley, Governor
W�lham G Rosc Jr.,Secretary
North Carolina Lie c�tti� 1 sources
,. Allan W.�amk Y� E: director
Ihvlslurt Oar Quality
May 14, 2007 NAY
,7
Mr. Corky Lane
APC Southeast
PO Box 127
Greenville, SC 29602
f
Subject. NCG`140000, Additional Information Request
APAC Charlotte
Mecklenburg County
Dear Mr. Lane.
Can May 30, 200E the Division of Water Quality, Stormwater Permitting Unit received your Notice o
Intent (NOI) to be covered under North Carolina's general ,permit NCG140000, submitted for your proposed `
location in Charlotte. This application was returned due to an inadequate design basis and an inadequate site <plan
on October 11, 2006. On May 8, 2007 the Division received a re -submittal application. At that time your engineer
contacted me to explain that the original signature was on file with the original application. I informed trim that the
application had been returned, and therefore the Division does not have information on file for this project.
signed application is therefore required with this submittal. Additionally, the $80 application fee was also returned
in October. These two elements are required for a complete application. In addition to these items, my review of
this application has determined that the site plan is still inadequate. Please comply with the site plan requirements
listed in the previous return letter. Please also note that hand -drawn items on engineering drawings are not
acceptable for permit applications.
Please contact me with any questions,"919.733.5083 x376 or [e-mail].
ncmail.net.
Sincerely.,
MKel1yy nson
Environmental Engineer
cc: Adam Grbb, RIP Environmental 100 South Highway 1, Suite 4-I3, Greer, SC 29651
SPU County Fibs, Mecklenburg County
Central Files
Stormwater Permitting Unit Files
No Carolina
c�iCi"�7,��1* f
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet: www.newaterqualit .orb Location: 512 N. Salisbury St. Raleigh, NC 27604 Fax [phone]
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IF!St7ateof North Carellna
tment cif Environmentnatural Resources
Division of Water Quality IL 10
�9 A� ML
Michael F. Easley, Governor aL mCDEk mR
William G.!'RRoss Jr., Secretary NORTH CAROLINADEPARTMENT OF
Alan' W. Klimek, ,' Director
NvtRoNmet4T o N RAL Rey Rc s
August 5, 2005
. Warren Baker
AFAC Southeast
PtB 127
Greenville, South Carolina 29607
Subject: General Permit No. NCGI40000
AC -Blythe concrete batch plant
COC NCGI40356
Mecklenburg County
Dear Mr. Barer:
In accordance with your application for discharge permit received can July 1, 2005; and with
additional information submitted on ,July 27 and August 1, 2005, we are forwarding herewith the subject
certificate of coverage to discharge stormwater only under the subject state - NPDES general permit.
This permit is issued pursuant to the requirements of North Carolina General Statute 143-21.1 and the
Memorandum of Agreement between North Carolina and the US Environmental tion agency dated
May 9, 1994 (or as subsequently ended). Wastewater discharges are not authorized by your coverage
under the attached permit.
f any parts, measurement frequencies, or sampling requirements contained in this permit are
unacceptable to you, you have the right to request an individual permit by submitting an individual
permit application, Unless such demand is made, this certificate of coverage shall be final and binding.
Please take notice that this certificate of coverage is not transferable except after notice to the
Division of Water Quality. The Division of Water Quality may require modification or revocation ` d
reissuance, of the certificate of coverage.
This permit does not affect the legal requirements to obtain other ;permits which may be required
by the Division of Water Quality or permits required by the Division of Land Resources, Coastal Area
Management Act, or any other federal or local governmental permit that may be required.
If you have any questions concerning this permit, please contact :Ken Fickle at telephone number
(919) 73-5083 et. 584.
Sincerely,
ORIGINAL SIGNEr)
OFFICE
Alan W. Klimek, P. E.
cc: Mooresville Regional Office
DWQ Central Files ,
Stormwater Permitting Unit Files
Adam Gr bb, RTP Env, Assoc., 1900 S. Hwy 14, Suite 4-B, Greer, SC 29650
1617 Mall Service Center, Raleigh, North Carolina 7699-1617 Telephone [phone] V9EI�733-9919
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STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NO. NCGI40000
CERTIFICATE OF COVERAGE No. NCG140356
STORMWATER AND PROCESS WASTEWATER DISCHARGES
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215. 1, other lawful standards and
regulations promulgated and adopted by the No Carolina Environmental Management Commission, and the
Federal Water Pollution Control Act, as amended,
APAC Southeast
is hereby authorized to construct and operate a process wastewater treatment system, and is hereby authorized to
discharge suirrawater from a facility located at
APAC-Blythe site
Intersection of Brookshire Freeway and 1-485
Charlotte, North Carolina
Mecklenburg County
IV, V, and VI of General Permit No. NCGI40000 as'attached,
This certificate of coverage shall become effective August 5, 2005.
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
Signed this day August 5, 2005.
ORIGINAL SIGNED By
BRADLEY BENN;�--
Alan W. Klimek, Director
Division of Water Quality
By Authority of the Environmental Management Commission

N
July 15, '2005
Bradley Bennett
Sfor mwater and General Permits Unit
Division of Water Quality
1, 617 Mail Service Center
Raleigh, NC 27699-1617
RE: Notice of Intent (NOI)
APAC Readv Mix Concrete Plant for DOT Construction
Charlotte, Nfecklenburg County, NC
Dear Mr. Bennett:
A
PI
P1
ra
11
si
in
a
s". All appropriate erosion control measures will be used to prevent/minimize
,,n durin- the construction of this plant.
e note that the facility will have no wastewater discharges. The truck wash
fing system is constructed such that the truck wash pad is elevated above grade and
,ed on top of a soil stockpile area (concrete pad) and two frac tanks sit at grade
tly behind the wash pad. The collected as ter from the wash pad area flows by
ty into the frac tanks. The solids are allowed to settle out and are then removed
[anically and the accumulated water recycled back into the plant for process make-up
7 Or used to wet the roadbed prior to pouring concrete. Therefore, the system is
y closed -loop with no discharge.
Pckpiles will be diked to prevent any wastewater discharge from a -year storm in
irlotte area. The dikes will prevent runon front commingling with the stockpile
If a large rain event occurs, the facility will allow sufficient water to evaporate
in'tiltrate into the ground before resuming production operations. The dikes will
fie requirements of the Temporary Diversion in the North Carolina Erosion and
,nt Control Plannint-, and Desi-an Manual (Section 6.20).

V,
We have enclosed a copy of our NOI for this project. In addition, we are enclosing the
filing fee of $80 for this project. After reviewing our NOI, if you have any questions or
comments, please contact me at [phone] or you can reach me bye -mail at
a. �ribb@�)rten�vxom. Thank you for your assistance in this matter.
Sincerely,
Adam Gribb

FOR AGENCY USE ONLY
IWAL Date ivied
Year Month Da
00 ]Division of Waiter Quality ! Water Quality Section VCertfficaof
v
erge
IKIUMNK National Pollutant Discharge Elimination System Check # It Amount
e
. _
- Mew " 0 HRrsMmMS F 't Assigned to
NCG14 000 ITC
NOTICE OF INTENT"
National Pollutant Discharge Elimination System application for coverage under General Permit
I CG14i 000:
STORMWAT R AND PROCESS WASTEWATER DISCHARGES associated with activities cl �t to as°
SIC' 3273 Ready Mixed Concrete M
`Standard Industrial classification de
(Please print or type)
1) Mailing address' of ownerlo per tor -
Name 4°
Street Address
City - 'teKvv I State 5C ZIP Code
Telephone No, Fax:
Address to which all permit correspondence will be mailed
3) Location of facility producing discharge:
Facility Name N i
Facility Contact e
Street Address
City io State SIP Code l
County %*
"telephone No. F
3) Physical Location Information:
Please provide a narrative description of how to get to the facility (use street names; state road numbers and
distance and direction from a roadway intersection).-' b o�
(A copy of a county map or USES quad sheet with facility clearly located on the map is required to be submitted with this application)
4) This NPD S Permit Application applies to which of the following
New or Proposed Facility Date operation i to begin cad - 01- o s—
C1 Existing
) Standard Industrial Classification:
Provide the 4 digit Standard Industrial Classification Mode (SIC Code) that describes the primary industrial
activity at this facility
SIC Code: I +-
) Provide a blef description of the types of industrial activities and products produced at this facility
(Include a site process diagram with this submittal): A
Page 1 of 4 ;
sWU-229-101701

*III! N
• � a•N • Asa • � ,.. x ., • ,,
t • •
o- .sa • -• s i r • r - r r- • .ss s - «
a_ i a N#!1 .his •. � � .s c ' r •' s ♦, • ,: - •' _+
in receiving waters classified as WS-1 or freshwater ORW
8) Does this facility have any ether INPDES permits?";
No
41
Yes
If yes, list the permit numbers for all current NPDES permits for this facility.
) Does this facility have any Non -Discharge permits (ex: recycle permits)?
No
C1 Yes
If yes, list the permit numbers for all current Non -Discharge permits for this facility.
10) Does this facility employ any best management practices for stcrmwater control'
Cl No
C Yes
If yes, please briefly describe;
1) Does this facility have a Stormwater Pollution Prevention Plan?
s 11 Ye
If yes, when was it implemented?
12) Are vehicle maintenance activities occurring at this facility?
No
Yes
) Are discharges occurring from any of the following process wastewater generating activities?
Vehicle and equipment cleaning Ci Yes rNo
Wetting of raw material stockpiles Cl Yes No
Mixing drum cleaning C3 Yes C� No
If yes to ar y of the above, please describe the type of process used to treat and/or recycle the process
wastewater. give design} specifics (i.e. design volume, retention time, surface area.., etc.). Ilse separate
sheet(s)]
Note: Construction of any wastewater treatment facilities require submission of three (3) sets
of plans and specifications along with this applications. =Design of treatment facilities
must comply with requirements 15A NCAC 2H .0138:
Page 2 of
WU- 2-1o1701'

h
I
tvt. ZOOS
�, 714© Ulu N.W.I.
A
7) Discharge points / Receiving waters:
Flow many discharge paints (ditches, pipes, channels, etc.) convey stormwater from the property?
What is the name of the body or bodies of w ter (creek, stream, river, lake, etc.) that the facility stormwater
discharges end up in L
If the site stormwater discharges to a separate storm sewer system, name the operator of the separate storm
sewer system (e.g. Comity of Raleigh municipal storm sewer). }
Receiving water classification (if known):
Note: Discharge of process wastewater to receiving wafters classified as -11 to WS-fit or SA must
be approved by the N.C. Dept, of Environmental Health, If D H does not approve, coverage
under N G140000 cannot be granted. No new discharges of process wastewater are permitted
in receiving waters classified as WS-1 or freshwater ORW
) Does this facility have any other NPDES permits?
0
[1 Yes
If yes, list the permit numbers for all current NPDES permits for this facility:
g) noes this facility have any Non -Discharge permits (ex: recycle permits)?
0 No
C3 Yes
If yes, list the permit numbers for all current Non -Discharge permits for this facility:
10) Does this facility employ any best management practices for stormwater control?
C3 No
0 Yes
If yes, please briefly describe:
11) Does this facility have a Stormwater Pollution Prevention Plan?
C1 No
C1 Yes
If yes, when was it implemented?
12) Are vehicle maintenance activities occurring at this facility?
C1 No
El Yes
f 3) Are discharges occurring from any of the following process wastewater generating activities?
Vehicle and equipment cleaning C Yes 0 No
Wetting of raw material stockpiles 0 Yes 11 No
Mixing drum cleaning 0 Yes C1 No
If yes to any oaf the above, please describe the type of process used to treat and/or recycle the process
wastewater. Give design specifics (i.e.. design volume, retention time, surface area:, etc.). [Use separate
shet(s))
Note: Construction of any wastewater treatment facilities require submission of three (3) sets
of plans and specifications along with this application'. Design of treatment facilities
must comply with requirements 1As NCAC 2H .038.
Page 2 of
SWU-229-101701

F V
FNCGI40600 N.O.I.
14) Does the facility use a recycle system?
0 No
Yes
If yes, does the system overflow only during rainfall events exceeding the 10- r, 4-hr rainfall event? Yes 0 No
If yes, provide plants, calculations; and supporting documentation.
1') Hazardous Waste:
a) Is this facility a Hazardous Waste Treatment, Storage, or Disposal Facility?
96 No
0 Yes
b) Is this facility a Shall {quantity Generator (less than 1000 kg. of hazardous waste generated per month) of
hazardous waste?
(� No
C] Yes;
c) is this facility a Large Quantity Generator (1000 kg or more of hazardous waste generated per month) of
hazardous waste?
No
Yes
d) If you answered yes to questions b. or c., please provide the following information:
Types) of waste:
Flow is material stored.
Where is material stored:
Now many disposal shipments per year:
Name of transport J disposal vendor:
Vendor address:
16) Certification.
North Carolina General Statute 143-215.6 b (i) provides that.
Any person who knowingly makes any false statement, representation„ or certification in any application, record, report,
plan or other document filed or required to be maintained under Article 21 or regulations of the Environmental
Management Commission implementing that Article, or who falsifies, tampers with or knowingly renders inaccurate any
recording or monitoring device or method required to be operated or maintained under Article 21 or regulations of the
Environmental Management Commission implementing. that Article, shall be guilty of a misdemeanor punishable by a
fine not to exceed $10,000, or by imprisonment` not to exceed six months, or by both. (18 U.S.C. Section 1001 provides
a punishment by a fine of not more than $10,000 or imprisonment not more than 5 years„ or both, for a similar offense.)
I hereby request coverage under the referenced General Permit. I understand that coverage under this permit
will constitute the permit requirements for the discharge(s) and is enforceable in the same manner as an
individual permit.
I certify that I am familiar with the information contained in this application and that to the best of my knowledge
and belief such information is true, complete, and accurate:
Printed Name of Person Signing:
Title.
(i nQDDif ant)) (DateSigned)
Page 3 of 4
SWU--101701

W,V
PlCG140600 N.O.I.
Notice of Intent must be accompanied by a check or money order for $80.00 made payable to:
NCDENR
Final Checklist
This application will be returned as incomplete unless all of the following items have been included:
Check for 80 made payable to NCI ENR
This completed application and all supporting documention
Copy of county reap or USGS quad sheet with location of facility clearly marked on map
Mail the entire package to:
Storm ter and General Permits Unit
Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 2769-1617
Note
The submission of this document does not guarantee the issuance of an NPDES permit.
Page 4 of 4
SWU-22-101701

PROCESS DESCRIPTION
APAC-Southeast, Inc., converts aggregate, sand, cement, flyash and water into concrete
for the construction of concrete roads and highways. The incoming cement is transferred
to the cement silos. Aggregate, sand, cement, and flyash from the storage silos are
combined in the cement scales where they are mixed and sent up the enclosed conveyor
belt system to the mixer where water is added. The ' 'x is weighed and then unloaded
into trucks for transport to the job site.

3

Copyright (C)1999, Maptech, Inc.

4

, �.Onstrluction Inc
Proposed Site Plan
p�topos o :T MPORAPY 4 t t *i �: TE �'LANI i
for 1-48 Constt'`uw� t.WO a
Contract r�--__--vASHLAN & Blythe Construction Inc;
property owner (s)- NC OT
pro)ect na. -6. 78019T Mecklenburg County
-___ _ -a- 1.d7 ha ;
area,-�-__-- - _ _w__�-_ ;
____
contractor's signature
owner's signature (s)
5
date: pruary 2Sth., 200
t'{
cR
s
n
wr aka ., � •,�� x
4
APAC - SouthEast Figure Five
Plant Layout
RTP Environmental Associates, Inc.

fir`
".ram...
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Sib
..Score ....,.®:..«....,....
. xi,dlrih GrsorM Stmsgs
Cv+LPCv xWGO iv+ioob+9 �""
CYMSMGrouna 5iwa4•««««t t«..i
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113
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APACABALLENGER PAVING CO., INC. RTP ENVIRONMENTAL ASSOCIATES, ING!o FIGURE THREE
PROJECT NO. 4040.03 ©ATE: 8/96 PROCESS FLOW DIAGRAM

t
APAC-SouthEast, INC. NOI
Section 10
MAY 2006 RTP ENVIRONMENTAL ASSOSCIATES, INC.

Pkacfices
Litter will be controlled by daily area clean ups
Storage stockpiles will be wetted as needed
Traffic entering the site will pass over gravel beds
Processing equipment will be inspected to ensure proper operation and :maintenance
Vehicles will be inspected to ensure proper operation and maintenance
Silt fence will be installed as needed

APAC-SouthEaq INC. NOI
Section 14
MAY 2006 RTiP ENVIRONMENTAL ASSOCIATES, INC.
4040.23/REPORT.WPDl4040}04

RECYCLE PROCESS DESCRIPTION
process
water including truck and plant wash waters are recycled. See
attached documentation.
eration for over four year and was used in
The it has been in op 0The unit maintains a minimum
Madison County, North Carolina in he to -year -hour storm for Charlotte is
of 12„ of freeboard- Sincet
inches, the freeboard of the unit is sufficient to contain the
s.
rainwater.

s� •
Size of Washwater cc
lon tanks
##1 Collection Tank acts as primary collection point_.. _
Collection rank receives water, from # (acts as second;
Estimated Volume of ashwrater/truck
----FMaximum #trucks wrashed/day ---T—
Gallons of truck washwater managed/stay
size of truck "-wash (25' x 2 ")
D nth of n d twith curh'snal
(depth sufficient to contain 25 r storm accumulation)
Volume of truck wash pad
NO Rt NON FROM OTHER PR PERT_E
size of ##1 Tank l th ^�.
width
fleiht.
F
......« ......`....#2.......................m,.�........�«.__.._,.......... _P.........._.,.. .,........
size of 1`ank. � lw_ _ length
wdith
height
------------
Assuming worst case scenario, ucontinous truck washing and
_ Volume of wash water
trmwatr (25-yr,24-hr)
{on pad and into tanks)
5torrnwater collected in tank itself
(assume tank open during rain event)
Total Volume of water managed in tank #1=
0
I
A

is volume of water managed in tank ##1 during rain went < tank design capx
If tank #1 were to completely overflow into lank # , is capacity of #2 OK?
Esfimated frequency of removal of accumulated sediment ari
� mow_ _�.
Assumes no rainfall
Assume sediment accumulated "flocs" from water column
Assumes no rainfall
Assume sediment accumulated "flocs" from water column
Frequency to remove sediment and water after 25-yr, 2-hr E
Tank #1
Tank #2
ALL SOLIDS MANAGED AS NON -HAZARDOUS ARDOU WASTE
_ _ ALL SOLIDS DISPOSED OF AT LOCAL LANDFILL _.._ ...
_ E '.__..
water in tank #1;
I.

Determination of Berm Height for #57 Rack Stockpile
Estimated surface area of #57" Washed Stone - 5400 square feet
60 feet wide
by 90 feet long
25-yr, 24-hr storm event = 6 inches
(figure 8.3k)
Curve Numbers
Soil Group
Using Table 8.03(b), Assume CN = 90 (worst case, newly graded wlgravel)
Runoff Depth (Table 8.63c) = 4.85 inches
Total volume of runoff 'from # 7 stockpile - 2182.5 cubic feet
(25-year storm) 16325.1 gallons
Site has a 2% grade and stockpile is located on center line of the site
Find the Volume of the depressed area (triangular prism)
Volume = 0.5*width*height*length
height=0.0 *(widthl )
Volume = 0.005*base^2*length
Volume Prism = 1620 cubic feet Prism Height 0.60 feet
7.2 inches ;
Assume #57 Flack has a 40% Void Volume
648cubic feet
tt
Remaining Volume = Total Volume - Prism Volume
Remaining Volume = 1534.5 cubic feet AUG 0 1 2005
Depth = Remaining Volume 1 Area > % Void t)F_Nft • wATER OLIA ITY
W ,, ft tar §Lwh
Depth = 0.710417 feet
8.525 inchesSf
Total Water Height at Center Line = Prism Height + Depth
Total Water Hieght at Center tine = �%
1.310417 feet V �C
1.725 inches
Minimum Freeboard
0.3 feet z Lb�1�t1� C
.6 inches
Minimum Heeht = Center Line + Freeboard 'L•a
1.610417 feet
19.325 inches
So a Crusher Run Aggregate berm 20 inches from the lowest point will contain a 25 year storm
North Carolina' Erosion and Sediment Control Planning and Design Manual
6.20 - Temporary Diversions
07/25165 Phone Conversation with Ken Pickle

Determination of Berm Height for #57 Rock Stockpile
Estimated surface area of #57 Mashed stone - 5400 square feet
60 feet wide
by 90 feet lung
25-r, 24-hr storm event
(figure 8.03k),
Curve dumber;
Soil Group
Using Table 8.03�), Assume CN
Runoff Depth (Tabl 3c)
Total volume of runoff from ##57 sto pile
125-year storm)
Site has a 2% grade and stockpile is for d on center litre of the site
Find the Volume of the depressed area (triangular prism)
Volume = 0.5*width*height*length
height= 0.02*(wr"th/2)
Volume = ( ,005*baseA2*length s
Volume Prism 1620 cubic ee t,
Assume #57 Rock has a 40% Vold Volume
68 cubic feet
Remaining Volume = Total Volume - Prism Volume
Remaining Volume = 1534..5 cubic feet
Depth = Remaining Volume / Area / % Void
Depth 0.710417 feet
8.525 inches
Total Water Height at Center Line = Prism Height + Depth
90 (worst case„ newly graded w/gravel)
uil �
Prism Height = 0.600 feet
.2 inches
CARO/
0 PARTNERS
NCB• P.0630
Total Water Heeght at Center Line
1.310417 feet {>
15.725 inches
Minimum Freeboard
0.3 feet
3.6 inches r �
Minimum Hieght = Center Line + Freeboard
1.610417 feet
1.25 inches
o a Coarse Aggregate berm 20 inches from the lowest point will contain a 25 year storm
North Carolina Erosion and Sediment Control Planning and Design Manual
6.20 - Temporary Diversions

,termination of Berm Height for Sand Stockpile
2700 � t
m cremated surrace area of Sand Stock Pile =
square ee
45 feet wide
y
60 feet long
Rainfall, Charlotte, 25-yr, 24-hr storm = 6 inches
(figure 8.03k)
Curve Number.
Soil Group
Using Table 8.03(b), Assume C 90 (worst case, newly graded /gravel)
Runoff Depth (Table 8.03c) =
4.85 inches
Total volume of runoff from #57 stockpile -
1091.25 cubic feet
(25-year storm)
8162.55 gallons
Site has a 2% grade and stockpile is located on center line of the site
Find the Volume of the depressed area (triangular prism);
Volume = 0.5*width*height*length
height=0.02*(widthf2)
Volume = 0.00*base/12*length
Volume Prism = 607.5 cubic feet Prism Height 0.450 feet
5.4 inches
sand has a 30% Void Volume
18.25 cubic feet
ig Volume = Total Volume - Prism Volume
Ig Volume = 909 cubic feet AUG 0 12005
Remaining Volume 1 Area I % Void 0 NR .WATER ALITY
WoUnds &
Depth - 1.12222 feet
13.46667 inches
w titer Height at Center l lne - Pnsrr► Hugh# +Depth ,✓
later Hi ght at Center Line = -�
1.572222 feet
18.86667 inches
im Freeboard
0.3 feet
'd
.6 inchesCt1
nurn Heeght = Center line + Freeboard
1.87222 feet
2.46667 inches
Crusher Faun Aggregate berm 23 inches from the lowest point will contain a 25 year storm
i Carolina Erosion and Sediment Control Planning and Design Manual Y
- Temporary Diversions:
5/05 Phone Conversation with Ken Pickle

Determination f Berm Height for Sand Stockpile
Estimated surfece�rea of Sand Stock File
by
Rainfall,; Charlotte, 25-yr, 2-hr storm 6 inches
(figure 8.03k)
Curve Number
2700 square feet
45 feet wide
66 feet long
Soil Croup = C
Using Table 8.63(b), Assume CN = 90 (worst case, newly graded wlgraval)
Runoff Depth (Table f�03c)
Total volume of runoff from #57 stopile
t' r�®xKa r cfnrml w
Site has a 2% grade and stockpile is located on center line of the site
Find the Volume of the depressed area. (tria' ular prism)
Volume = 0.5*width*height*length
height=0.Q2*(width
Volume = 0,005* ase^2*length
Volume Prism 607.5 cubic feet
Assume sand has a 30% Void Volume
182.25 cubic feet
Remaining Volume = Total Volume - Prism Volume
Remaining Volume = 909 cubic feet
Depth = Remaining volume f Area / % Void
Depth I.122222 feet
13.41667 inches
4.85 inches
1091.25" cubic feet
8162.55 gallons
Total Water Height at Center Line = Prism Height + Depth , y
Total Water Hight at Center Line
1.572222 feet
18,86667 inches
Minimum Freeboard =,✓
0.3 feet
3.6 inches ~
Minimum Hie ht = Center line + Freeboard
1.872222 feet
22.46667 inches
o a Coarse Aggregate berm 23 inches from the lowest point will contain a 25 year storm
North Carolina Erosion and Sediment Control Planning and Design Manual -
.20 - Temporary Diversions
6.450 feet
5A inches
GAR
A TNfj�

s
� rs€.rWbs•arir ttaE[[+(�MeM
Design Criteria
6,20.2
downhill side with the spoil than to build diversions by ether methods. Where
space is limited, it may be necessaryto build the ridge by hauling in diking
material or using a silt fence to divert the flow. Use el to form the diversion
dike where vehicles trust cross frequently (Figure 6.20b),
Plan temporary diversions to function I year or more, or they may be con-
structed anew at the end of each da's grading operation to protect new fill.
Diversions that are to serve longer than... 30 working days should be seeded and
mulched as soon as they are constructed to preserve dike height and reduce
maintenance.
Where design velocities exceed ft/sec, a channel liner is usually necessary to
prevent erosion (Table 8.05a, Appendix 8.5) >
Temporary diversions may serve as in -place sediment traps if overexavated 1
to 2 ft and placed on a nearly flat grade. e dike serves to divert water as the
stage increases. A. combination silt fence and channel in which fill from the
channel is used to stabilize the fence can trap sediment and divert runoff simul-
taneously.
feasible,Wherever bOW and stabilize diversions o :. mitlaiii
other land -disturbing activities.
►.08MM
Velocity Table 8.05a, Permissible Velocities for Erosion Protection, Ap-
pendix 8.05.
Ridge design— side slope: 2:1 or flatter
3:1 or flatter at points where vehicles cross
top width: 2 ft minimum
freeboard:0.3 ft minimum
settlement: 10 ca of total fill height minimum

Practice Standards and Specifications
Channel design-- shape. parabolic, trapezoidal, or V-shaped
side slope.. 2:1 or flatter
3:1 or flatter where vehicles cross
Grades —Either a uniformor a gradually increasing grade is preferred. Sudden
decreases in grade accumulate sediment and should be expected to cause over-
topping. A large increase in grade may erode.
Outlet —Design the outlet to accept flour from the diversion plus any other con-
tributing areas. Divertsediment-laden runoff and release through a sediment -
trapping device (Practice 6,60, Temporary Sediment Trap and Practice 6.61,
Sediment Basin), Plow from undisturbed areas can be dispersed by a level
spreader (Practice 6.40, Level Spreader).
Small diversion ere the diversion channel grade is between 0.2 and 3%,
a permanent vegetative cover is required. A parabolic channel and ridge 1.5 ft
deep and 12 It wide may be used for diversions with flows up to 5 cfs. This depth
does not include freeboard or settlement. Sane shapes should be 3:1 or flatter and
the top of the dike must be at least 2 It wide.
Construction
1. Remove and properly dispose of all trees, brush, stumps, and other obl -
Specifications
tionable material,
2. Ensure that the minimum constructed crass section meets all design require-
ments.
3. Ensure that the top of the dike is not lower at any point than the design eleva-
tion plus the specified settlement.
4. Provide sufficient room around diversions to permit machine regrading and
cleanout.
5. Vegetate the ridge immediately after construction, unless it will remain in
place less than 30 working days.
Maintenance
Inspect temporary diversions once a week and after every rainfall. Immediate-
ly remove sediment from the flew area and repair the diversion ridge. Careful-
ly check outlets and make timely repairs as needed. When the area protected i
permanently stabilized, remove the ridge and the channel to blend with the
natural ground level and appropriately stabilize it.
References
Surface Stabilization
6.10, Temporary Seeding
&11, Permanent Seeding
6.14, Mulching
Nutlet Protection
6.40, Level Spreader
6.41, Outlet Stabilization Structure
..3

Sediment Traps andBarriers
>. 0, Temporary Sediment Trap
6.61, Sediment Basin
Appendices
.03, Estimating Runoff
.05, Design of Stable Channels and Diversions
6.2.

71
environmental health • safety consulting services
July 11, 2000
N r. barren Baker
EHS Director
AP.AC-Georgia, Inc:
Ballenger Paving Division
Post Office Box 127
Greenville, South Carolina 2960
Conceptual resign of Mobile Treatment Unit for
Concrete Fines -Bearing Wastewater
Dear ivIr. Baker, -
Enclosed please find three (3) bound copies of our conceptual design of the above. -referenced
treatment unit. Engineering calculations with supporting documentation are included along with
a proposed general layout of the system..
The unit design relies upon gravity sedimentation for the physical removal of concrete fines
produced during truck washing operations at a concrete batch plant. Space has also been
provided to allow installation of an optional sand filter polishing unit, if needed. Although the
system is designed to produce an effluent containing less than 50 ppm total suspended solids
during the first pass of wastewater, it is not intended that this unit be capable of consistently
complying with U.S. EPA effluent limitations guidelines for concrete batch plants. Furthermore,
you should be aware that, as the wash water continues to be recirculated., the effluent solids
concentration will likely increase above the treatment goal of 50 ppm.
This increase will be due to a combination of factors including, evaporative losses and a gradual
accumulation of very fine solids that will simply not settle by gravity alone in the length of time
provided. You will creed to add fresh make-up water and may even finad it necessary to "waste" a
portion of the treated effluent in order to maintain the required water quality for washing
operations. -Wasting can be accomplished via use as dust suppression water on the construction
site or as feed, to the concrete batch plant.
Thank you for this opportunity to provide engineering assistance. If you require y additional
help or have any questions, please feel free to call
Very truly yours
Raymond 1 . Burgess, P.E.
Enclosure
PC: Marls Quarles, E P
GAa—KAPAC\1ccterst rboii 10 rb,do

Wastewip May
* — Phone.
Fab
WasteQUIP May Fab FAM
ema L
O' Warren Baker
m., Tom
m Wdlkr
cc: At F.,4L '1 i-5.-59-6061
Date., 9161,00
Subject., A,f'AC Containers
Per our discussion yesterday-
viayfab will furnish (1) 40 yd RBGD container with following:
(1) small fixed baffle at rear, '_" tall
(1) built-in wier Mate w/ " adjustable blade on top
() slily -in wer plates w/boles
(1) 6"t inlet and (1.) " outlet
Your cast would be $13,708,00 each, plus fr -lit
Ma fa.;b will furnish (1) 30 yd RBGD container with following:
(1) fired baffle, " 0" tall starting, at 1' 1" fron the bottom
of the container
(1) false floor consisting of expanded. metal %vith 4" channel
supports underneath
The rear of this cavity will be gasketed to seal against
the door.
The rest of the container will be open:
There will be a 3" inlet pipe and a " outlet pipe on the side of
the container, appx. 4"-„ fron the floor
Your oast would be $6225.00 ea plus freight.
Your total cost would be:
40 yd. RBGD $13708,00
30 yd RBGD 622HO
Freight 1400.00 (est)
Taxes: 16.0
Total cost $22716.00
Torn Walker

WASTEQUIP
OPEN -TOP ROUND BOTTOM ROLL OFF CONTAINERS
WITH GASKETED REAR DOOR
EFFECTIVE 8-5-96
SPECIFICATIONS:
Floor plate:
Side plates.
Front plate:
Front posts:
Side pasts.
Ltcr� post:
Hinge post.
Crossmembers:
Trap rails:
Door sheet:
Door frame:
Inside doer frame:
Rollers:
Nails:
Rail extensions:
Hook:
Nook plate.
Welds:
Finish:
1f4 plate or 7 gauge option
7 gauge
7 gauge
8 x 3 x 7 gauge formed channel
17 x 3 x 13 gauge formed channel
6 x 3 x 7 gauge formed channel
17 x 3 x 7 gauge formed channel
3" structural channel, 16" o.c.
4 x 3 x 3/16 structural tubing
7 gauge
4 x 3 x 3116 structural tubing
4 x 3 x 7 gauge forged channel
8" dia x 10" Zang at rear, S" long at front
x 2 x 1/4 structural tubing
1 7116 plate
1 1/4 plate, 36,000 psi minimum yield strength
3/4 plate
Interior continuous, exterior skip -welded
Primed inside and out with red oxide primer, exterior finish coated with
alkyd enamel

SPECIFICATION
Fluor plate:
Side plates',
Front plate, -
Front posts:
Crossmemben
Trip rails:
Door sheet:
n,,,. c­­
Rollers.
Rails
Rail extensions:
Hook:
Hook plate:
Welds;
Finish:
WASTEQUIP
WAYEAH
OPEN -TOP ROUND BOTTOM ROLL OFF CONTAINERS
WITH GASI ETED REAR DOOR
EFFECTIVE 8-5-6
S:
1/4 plate or 7 gauge option
7 gauge
7 gauge
6 x 3 x 7 gauge formed channel
17 x 3 x 13 gauge formed channel
6 x 3 x 7 gauge formed channel
17 x 3 x 7 gauge formed channel
3" structural channel, 16" oc.'
4 x 3 x 3/16 structural tubing
7 gauge
4 x 3 x 3/16 structural tubing
4 x 3 x 7 gauge farmed channel
" dia x 10" long at rear, S" Tong at front
6 x 3 x 1/4 structural tubing
1 7/16 plate
1 1/4 plate, 36,000 psi minimum yield strength
3/4 plate
Interior continuous, exterior skip -welded
Primed inside and out with red oxide primer, exterior finish coated with
alkyd enamel

S a rJ L 's4k 1t S 2 jd'.
WASTEP'o. box 1024
QUIP OttvUt, UX 19104-1024
IWA vF a F312J 35A-lon
OPEN —?OP ROUND BOTTOM ROLL OFF CON AFNEI
NWTH CASKETED REAR DOOR
J6#t
6_5
1� rrc+na r wn 3-01.4

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APAC
30 CU YD GASKETED AD W)fALSE PARTIAL FILICA
CONTAINEA ASSEMBLY
JUT ' - #" 1 OF i

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DETAIL A
SCALE: 114* -
_ 30 Wts r W .._ . +z •_ _.w.. —, <a _ {_ f, *2 _�.:.._., _ 42 ra t 6
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UPtN;.St2Rtt2 22 tB x t V2 MEX CAP SCI1EW _
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COUTAINER ASSEMBLY
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a
APAC GEORGIA� INC.
i
BALLENGER PAVING DIVISION
T CONCEPTUAL ESQ CALCULATIONS
LATI
FOR
MOBILE TREATMENT UNIT HANDLING
CONCRETE FINES
FROM
OPERATIONTRUCK WASHING
1h
TULY 2000
�lttt ltttdltt7jgggl
a
-A + x"
w ♦ '3
r •F' V qa'q t'"r+.J'
Prepared by , FfiFc F TEr 4 ,",N,
Frl gilt$ f lilt ttlll

Design Assumptions
L Effluent from the treatment system will be recirculated to the truck washing
operations.
2. Approximately 50 gallons of wash water will be required for each truck washed.
Based on a maximum of 20 trucks, each track washed a maximum of 4 times per
day, the maximum daily volume of wash water required is 4,000 gallons.
. The maximum instantaneous wash water flow rate = 10 gTm.
4. The solids to be removed from the wash water will behave as discrete settling
particles.
The initial tots suspended solids (TSS) concentration will b less thaxm 2;00t1 pprn.
6. A °treated effluent containing less than 50 ppin TSS (first pass) is desired for
z recirculation to the washing operations. This is equivalent to a 97.5 percent
removal efficiency at influent TSS = 2,000 pprn.
Resin rationale
The removal of discrete settling particles is related only to the surface overflow rate, a
common basis of design which can be demonstrated to be mathematically equivalent to a
settling velocity ( etacalf and Eddy, Inc., Wastewater Engineering: Collection,,
Treatment and Disposal). In practice, a common procedure for design is to determine the
required minimum settling velocity to achieve the desired effluent quality and then design
the sedimentation unit so that all particles with a terminal settling velocity equal to or
greater than this minimum velocity will be removed. Determination of this required
settling velocity may be accomplished in � o ways: 1) by use of sieve al sis d
hydrometer tests combined with Stoke's Law, or 2) by use of settling column tests.
The latter procedure has been used for this project using settling column test data
generated by the U S. Environmental Protection Agency (EPA) from a typical
wastewater sample collected from a truck washing operation at a concrete batch plant.
The results of these tests were published by EPA as Figure 15 (copy included —see
Appendix) in the Development Document entitled Effluent Limitations Guidelines and
New ,Source Performance Standards for the Concrete Products Point Source Category
dated February 1978, Data that can be derived from this graph are shown in Table l on
the following page.
apactreporesiw treat2.doc

Table
Settling Column Test Results (from EPA)
Settling Time, Suspended Settling Percent
minutes Solidsi, Velocity Solids
Sample Z.D. mcr ft/min Rernainina
1657 100
4
1 5 327 0.6 � 21.O
15 19 0.2 12.4
I
j f
I
,•
4 180 77 0.0167 ( 4.9
240 4 48 0.0125 3.1
i
6 1200 20 0,002 l .a
t All samples were collected at a 3-foot sampling depth in the settling, column,
The settling, velocities shown above were calculated using the �-foot sampling depth and
*.e
t
cumulative time which had transpired. Each of these velocities can be converted to an
equivalent surface loading rate for use in the sizing of the treatment unit. A typical
4
calculation is as fellows.
Settling velocity = 0,05 f`tlmin
Equivalent surface loading rate = 0.05 ft/min x 1440 min/day x 7.48 gal/ft3
639 gal/day/ftI of surface area
For any given loadinc, rate, only those particles With settling velocities greater than this
rate will be completely removed. However, a portion of the particles with slower settling
rates will also be removed, This fractional amount of slower settling particles to be
removed at each settling velocity is represented by the area to the left of the Settling
Velocity vs. Percent Solids Reinainin'a curve plotted. in Figure 1. Calculations for
determining these areas are presented in the attached appendix using a method described
in the text Development of Design and Operation Criteria for Wastewater Treatment
(Adams, C. E. Ford, D. L. and Ecl,enfelder, W. ,). The results are summarized in Table
2 and presented graphically in Figure 2.
1 apac/rcport w%Ytreat2.doe
i'

Table ?
Design Criteria Summary from Treatability Data
M72
verflov Rate, °l� Total Suspended
in
Solids Removal
6.9 98,72
34.6 � 98.12
0.0I67 179.9 97.59
I �
0.0553 .6 95.41
0. 0 154 9 L
S
0.60 646.) 86,13
Design Calculations
1. From Figure 2, the required surface loading rate (SLR) to achieve 97.5 percent
removal is approximately 180 gallons per day per square foot (gift`)•
At a design flow rate = 10 apm = 14,400 gpd, the required surface area for the
primary settling area in the treatment unit is 14,400gpd/10 gpd/ft`' = 0 ft'.
minimum safety factor of 1.5 is reco ended for scaleup to the full-scale
treatment unit.
Minimum required surface area = 80 x 1.5 = 10 ft'.
?. It is proposed that the mobile treatment unit be constructed from a standard solid
waste roll -off box. The standard inside width dimension is 7.5 feet.
Required minimum length of primary settling area = 120 ft'/T5 ft = 16 ft.
The Owner has also requested that a separate grit chamber be provided ahead of
the primary settling area to remove the largest/heaviest particles.
From Figure 2, it is shown that use of a SLR = 3,500 gpd/ft2 will achieve 90
Percent solids removal.
1. At the design flow rate = 14,400 gpd, the required surface area for the grit
chamber design is 4.11 ft-,
apadre pons/wwtreaLldoc

With a 1.5 sole -up factor, the minimum required area = 6.17 �.
Required length = 6,17 ft2/7.5 ft = 0,82 ft
Provide minimum length = 4 feet
4, An effluent holding * will be required to store water for the recycle/reuse
operations. The recommended minimum volume should be equivalent to one
cycle oft ck washing, e.c,. each truck washed one time,
Required minimum volume = 20 trucks x 50 gal/truck. = 1,000 gallons = 13 4 ft':
Assuming a maximum usable depth of 4 feet (without filter installation) and a
standard tank width = 7.5 feet, the required length of the effluent charnber is 134
ft'/4 ft/ 7.5 ft = 4.5 feet. Use 5 feet,
. The minimum required length of the roll -off box is 16 4 + 5 25 feet (inside
dimension)
Provide additional 5 feet of length to allow for possible future addition of a sand
filter.
Total length to be provided = 30 feet.
6, The available filtration area provided = 5 ft x 7.5 feet = 37.5 ft'`.
At a maximum design flow = 10 crpm, the Ater loading rate = 0,26 gp /ft'-
Mote — If necessary, the length of the sand filter can be increased without reducing
the effluent holding tank- volume, The required filter area will be based on field
experience and frequency of cleaning required,
A proposed general layout of the treatment unit is presented in Figure .
apaclreports/wwtreaa,doc
4

0.00
I
p
f!
1
40.00
i
A
10.00
MW
ME
Figure I Plot of Settling Velocity
vs. Susnended Solids
0.10 0.20: 0.30 0.40 0.50
Settling Velocity [ft/ Ind
0.50

..-.Figurem^: Relations
100.0
:t
7.
.
0
E
I
..
0.0
.
.O
2.
0.0
7..
7.
2.
M
.5
n Cau l and Overflow
r I
5.0 t' 1 f{ t I i 4 t.;•: . l l 7 I I I e I I I. I .
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500
Overflow Rate cg d/ff2

APPENDIX

log
S 41PL,E WAS 08TAINED F#TC7hf PLANT 7363
INITIAL. T`SS I65,r hIGAIT ti
ALL ME READINGS WEIIE TAKEN MOM 3 FT DEPTH LeEVEL. OF SETTLING COLUMN
)
Cl
-1
C)
U)
tali
Q01 O«I ID
1
SETTLING, TIME:, FOUR
FIGURE 1
SETTLING RATES FOR CONCRETE FINES IN TRUCES WASHOUT
loo

APPENDIX
CALCULATION OF FRACTIONAL
REMOVAL OF SLOWER SETTLING PARTICLES
AT EACH SET LING VELOC"
1} Critical Settling Velocity =
0,0125
fthnin
% Suspended Solids
Fractional
Remaining,
Delta X
Settling Velocity, V
Average V1V
1 '
�c1e1ld X}'( Average V1V°j
Remaining
_ 1.28 #Ct
O.Oi285
0.01285
0.0025
0" 1 _
_ 0.2
_ 0,001285
0.0107gC}
3.08290
0.0 0S3
O.U17J8
.O125
U.6
1
Total Removal =
#REFI
Overflow Rate =
0,01250
ft311t2 fain
Overflow Rate
134.65
gal/day (t2
2) Critical Settling Velocity =
0.0167
Ithoiir
yy
f
fu Suspended Solids
tractional
Perrmining, X
Delta
Settling Vt'iCiClty,.
Average Vl
V1Vx
.(dell ES r'' )°( AVf:ra<te /�/`)
Remaining
IlVrninl
1,28450
0.01 85
0.01285
0,0025
� 0.0749
_ 0,1407
_ O.00OrJ61
3.06 J0
003083
0.0179
0,0125
_ 0.44rJ1
L1.7485
O.Ot18077
4.t44 r40
0,04945
0.018 3
0_:0187
0,874`J
t.0000 �
0.01t;283
Total Removal
#REF!
Overflow Rate
0.01670
ft3tlt2 min
Overflow Rate
179.89
gall(lay ft2
3) Critical 5attling Velocity
0.05
fUmin
% Suspended Solids
Fractional
Remaining,. X
Delta X
Settling Velocity, V
Average VtV"
V1V"
(delta X)*(Average lrN")
Remaining
{tiJrninJ
0
0
1.28450
0.01285
0.01285
OJ 0025
0.0250
0.0500
� O.000321
3.08290
0.030E33
0.01798
0.0125
0,1500
0,2500
0.002698
4.946C1
0.0494
0,01863
0.0167
0.2rJ20
0.3 dQ
1.0000
0,009853
0,00985
6,4260
C1.Ofi423
0.01477
0,0500
O.6f70

Total Removal =
#PR Ft
over -low Rate =
0.05000
6131(12 Hain
Overflow Rate =
538,60
gal/day ft2
4) Critical Settling Velocity
0,2
fthoin
% Suspended Solids
Fractional
Delta X
Settling Velocity, V
!overage VNd
N"
(delta }"( Average V "}
Remaining
Remaining, X
jfttnanj
1.28450
0.[1128_
0 01285 ��
0,0025
0,0063
o.o125
(i.{l0008t)�
0,000674
3.08290
0,03083
0,01798
0,0125
0.037 �
0.07 SD
O.ti625
0,0835
0;001360
4.94540
0,04945
0.01863 ,
0,01M
0,0167
0.0500
�
0,166t3
0.25t}0.
�
�O.G1fJ2d63
6,42260
0,06423
0,12396
0,05973
0,2000
0,6250
1,0000
O,037331
12,39 60
_
t
Total Removal =
#tRCFI
Overflow Rate =
0,20000
WoU iniia
Overflow Rate =
2154,38
gal#day tt2
5) Critical Settling Velocity =
0,6
fthnin
% Suspended Solids
Fractional
Remaining, X
Delta {
Settling Velocity, V
Average VN*
VtV'
.(deity X)*(Average °)
Remaining
(fUeninj
w
0
1.28450
0
5
0,01285
0:01245
0.005
t3.QCt'.
31
0.0042
0,000027
0M0225
3,08290
0.03083
0,01798
0.0125
— 0.0125
0.0243
0.0208
0,0278
0.000453
4,94540
0.04945
0.01863
0,01477
0,0167
0,0500
0.0556
4).0833
_ 0.0
6,42260
0.06423'
0,1239
0,05973
0,2000
0.2083
0.3333
0.12821444
12
12,39560
0,21002
0,086C}6
0,6000
0.6667
1.0000
0,057375
21,00190
Total Removal =
i#RFFI
overflow Rate =
0,60000
ft3#ft2 drain
Overflow Rate =
6463.14
rgrallday'ft

Ca' 0 INFLUENT
SETWNG E EFFLUENT 3" o DRAIN `Nj V?.LVE;.
#ELL/GRI7 PRIMARY SETTLING AREA SAND FILTER � PUMP OUT
CHAMBER (SURFACE AREA = 120 SO. FT.) - (OPTONAL)
r- r:D. (tOOO CAL?
0'-9
TEL_
EL. 0'
..r
SITL 7"-4" HIGH x 8"-6' WIDE
SOLID WASTE ROLL -OFF BOX
kKam
.ALL. DIMENSIONS AND SIZES SHOWN ARE
MINIMUM VALUES TO BE PROVIDED FOR
MAXIMUM DESIGN PLOW - tD GPM.
WATER TIGHT RAFFLE:
EL. #' -0' (W1O SAND FILTER)
EL. I'--10- (W/ SAND FILTER)
07/I I/O
lull
0711000t.a'

Wash Water Containment and ClarifyingSystem
Photographs