HomeMy WebLinkAbout991398.tiff WEIDMANN ENGINEERING
CONSULTING ENGINEERS 16558 W.C.R.M7(REA
VICTOR H.WEIDMANN.P.E.&LS.,PRINCIPAL MEAD,
CO395
C 80542-039
(970)535-4885
April 28, 1999
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Ms. Sheble Mcconnellogue l, l .57.1q1,5171��li ;
Weld County Department of Health (a
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1517 16th Avenue Court „;
Greeley, CO 80631
Dear Ms. Mcconnellogue:
SP - 9800292
Septic System
12524 W.C.R. 25.5
This letter concerns the washing of pickup trucks at the above location with the
wash water going into the septic system.
The original design of 98-07-27 considered 8 persons at 20 gal./day/person
average with a total of 240 g.p.d. peak flow (at 150% of average), a 300 gallon
minimum septic tank capacity, and 488 s.f. of absorption bed. A 1,000 gallon tank and
612 s.f. of bed was installed to the north of the building.
Presently I am informed there are 5 part time and full time employees, most of
whom are mostly in the field, resulting in an equivalent attendance at the building of 3
persons per day.
Mr. Messenger has explained that the washing consists of 4 pickup trucks per
week at 70 to 15 minutes each with a pressure washer delivering about 3 g.p.m. The
washing takes place on an outdoor 25' x 85' concrete pad on the south end of the
building. The wash runoff from the pad goes through a grate over a 3' x 8' x 4' deep
concrete sump. A 2" outlet pipe is 3' up from the bottom. The 2" runs through a
grease trap and then to the septic tank. Above the 2" outlet the sump has a capacity of
180 gallons. In the event of any storm runoff from the pad exceeding the 180 gallon
capacity over the 2" outlet those excess waters become part of normal stormwater
runoff.
In my opinion such usage should have no adverse affect on this system.
Sincerely,
Victor Weidmann, P.E.
VHW:ps
pc: Mr. Lance Messinger
4 ExpASIT
991398 IAS. 4 /2(la
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