WQ0007405_Final Permit_19960829

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Water Quality
,lames B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
August 29, 1996
Mr. Jerry T. Dalton, P.E.
DLM, Consultants
Post Office Box 426
Clayton, North Carolina 27520
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EDEHNR
Subject: Permit No. WQ0007405
Engineering Certificate of Completion
Gregory Pool Company,
Oil/Water Interceptor & Wash Pad
Incomplete Certification
Beaufort County
Dear Mr. Dalton:
The subject engineering certificate of completion was received by the Division on August 10,
1995. The certification is incomplete because no seal from a North Carolina Professional Engineer was
affixed to it.
Normally, the subject certification would not be accepted by the Division, and would be returned
to you as incomplete. However, due to an unforeseen delay in reviewing this certification, the Division
will acknowledge receipt and acceptance of this Engineers Certification only based on the North Carolina
Professional Engineer signature and registration number.
Please be advised, that the Division of Water Quality requires every Engineering Certificate of
Completion to be both signed and sealed by a North Carolina Professional Engineer. No incomplete
certification will be accepted by the Division in the future.
If you have any questions concerning this matter, please contact Mir. John Seymour at 919/733-
5083 Extension 546.
Sincerely,
Carolyn D. cCaskill, Supervisor
State Engineering Review Group
cc: Permit File WQ0007405
Gregory Poole Company (permittee)
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

DLM, Consultants _.-.__.____....`�
8/2/95
ATTN: Geary McMinn
Gregory Poole Company
PO Box 469
Raleigh, North Carolina 27602
Sub: Final Inspection
Washington, NC
Oil/Water Interceptor & Wash Pad
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F aic,iS.'i 'fit0 , !i''.,Ellgin.`crs
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Permit # WQ0007405
A final 'inspection was made on 7/25/95 of the construction of the new wash pad and
oil/water interceptor at the Gregory Poole, Washington, NC site. It was determined at
that time that the construction has been accomplished with very little change in the original
plans. Minor changes, not affecting the final quality of the pretreated wash water, had
been made by the owner and contractor. These changes were normally related to the
finishing of the concrete, installation of the scour pad, construction of the steam/wash
shed, and construction of the block wall, I agree with all changes made during
construction.
In accordance with the original plans, the pad is graded in such a manner as to keep all
wash water within the pretreatment system. Washing of the largest equipment that will be
cleaned at the site was observed during the final inspection. No wash water was leaving
the pad, except through the pretreatment facility. Flow into the lagoon was as big as is to
be expected during washing operations. A bucket sample was taken at the outlet point to
the lagoon. There appeared to be no contamination in the sample. There was no visual
evidence of petroleum product nor was there any smell in the sample.
Also, t;.ie oil/water interceptor (separator) was inspected. The primary compartment had a
small amount of product on the surface (after 3 days usage) but the secondary
compartment was free of any evidence of contamination. It was apparent, at the time of
the inspection, that the system was working as intended,
All the primary grading of the surrounding earthwork had been completed with only the
seedbed preparation remaining, and the seeding. It was my understanding, from the
contractor, that the seeding and mulching would be accomplished within the week.
Grading was such that all unpolluted surface water would be eliminated from the system.
Based on certification from the contractor, the following was accomplished during
construction:
442112 East Main Street, Suite 8 — RO. Box 426 — Clayton, NC 27520 -- [phone]/Fax [phone]

• All flat -work concrete has water -tight joints.
• All flat -work concrete has #4 rebar, 18" o.c.
• The centers of the pads are 1' thick and the edges 1.5' thick
+ The ramp is 2' thick
0 All concrete block walls have 94 rebar in every forth hole, grouted into the slab
Based on the inspection of the system it is my belief, and certification, that the structure
was constructed as basically }Manned and in such a manner as to provide the desired
pretreatment, as required in Condition #12 of Permit No. WQ0007405, dated January 7,
1994.
As also required by Condition #12, a copy of this certification should he mailed to the
Water Quality Perrnits and Engineering Unit, RO, Box 29535, Raleigh, NC 27626-0535,
Jm T. Dalton, P.E.
#16282
Enct 1. Final System Layout
2. 1500 gal. Interceptor

NO 11 :
I . All WtE.' ll(A s wotet - tight joint
2. Pad Ihic:kness is 1' in centr,r; 1.5' on edge
;'. Ramp thickness is —2'
4. All fint.--work concrete has #4 rebar, 18" o.c.
5. (;oncrele E-31ock walls has #4 rebar in every fourth hole
6. E?I(7{,1. wall (around wash/holding pads to control runoff
4 ), x
wog : t pad
str,c.-,I pIrate..-
-
scour par_f
c1' X ?
tf�te black `.~
(-rrrdninrrient wall
rtr nr n(-1 wash fad
(-ind holding pad
--steam/wash shed
�! --trnirt rail
18' x 12'
unc'onrie(_ to Curb
3 I x .34'
h dding pad
7:1 ramp
low
-- 1500 gol
iMerce=
Inside of wall grouted for water tightness
bt( r"
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1500 GALLON MEASE INTERCEPTOR
s„ 8 ' — 6" 6.'
4" -� �— 36" 6"
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PLAN VIEW
Vulcan V-1384 Rings and
X"',-Covers brought to grade
L.. �--1'--'
23"
23"
6"
IL
4
8" 12"
1'6 Butyl Rubber
Sealant in ,point
�6
6'-0„
4' (
60„
PVC Tee
b•
24"
12'
SECTION VIEW
CONCRETE:
4000 PSI at 28 bays
REINFORCING;
H-20 Bridge Loading
6" J
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