Park Place-CS 910404 / INC..
Municipal and Utility Contractor's Sen/ices
April 4, 1991
Mr. Larry Davis
Development Construction Inspector
City of Coppell
732 Deforest Rd.
P.O. Box 478
Coppell, Tx 75019 _
Re; Park Place Addition
Air Test Results
Dear Larry,
C.W. Young Construction Co. retained us Thursday, April 8th 1991,
to perform line acceptance testing in the Park Place Addition. The
line segment tested was in Woodcrest Lane, (an 8" sanitary sewer)
line "C" from station #8 + 31 to 13 + 06. The criteria used for
acceptance testing on SDR35 was the current North Texas Council of
Governments set o~ standard specifications, located in division 6
on pages 332 and 333.
The line segment was approximately 475' in length with service
lines capped at the property line. Our test procedure was to ~ump
the line to 4 psig and allow the air to stabilize. The line was
bled back to 3.5 psig and the time noted to begin the test. The
C.O.G. standard for 475' of 8" SDR 35 is 4:26 minutes allowed time
for a drop in pressure from 3.5 to 2.5. If a pressure drop of 1
psig occurs in less than 4:26 minutes, the line would not meet the
standard, if a pressure drop is less than 1 psig in 4:26 minutes
the line meet the test criteria established by C.O.G. and meets the
standard.
continued
515 N. Kealy Street 19350 FM 1093
(214) 436-4568 Lewisville,Texas 75057 · Richmond,Texas 77469 (713) 579-0074,
ON[ INC. .
Municipal and Utility Contractor's Services
page 2
In testing this line segment, we noted a pressure drop of 1/4 pound
during the 4:26 period of allowable loss. This amount of loss
falls well within the C.O.G. guidelines. It is clear that the line
has met the standards required and will perform as designed.
If I can be of any further assistance, don't hesitate to call.
~6;~es's~~~in~ral Manager
c.c. C.W. Young
c.c. Howard Pafford, City of Coppell
GTS/nl
515 N. Kealy Street 19350 FM 1093
(214) 436-4568 Lewisville, Texas 75057 · Richmond, Texas 77469 (713) 579-0074