ST8504-CS 870804SALES * SERVICE * RENTAL
Aug. 4, 1987'
City of Coppell
ATTENTION: Steve
RE: Riverchase Dr.
Dear Sir:
On 7-22-87 , our company was contracted to perform sewer
system testing on Riverchase Dr. job
for Jensen Const. . Our testing
was completed on 7-27-87 , and met all air testing and de-
flection requirements, per the City of Coppell
specifications.
We appreciate the opportunity to service the City of CopDell
and hope to continue to provide our service to local con-
tractors in the near future.
Sincerely, S~~
President
GTS/llk
On station 5+86 to 10+00, a 6" mandrel pulled through 8" line.
P. O. BOX' 160425 · IRVING, TEXAS 75016 · (214) 556-0188
LOW PRESSURE AIR TEST FOR GRAVITY SANITARY SEWER
TEST PROCEDURE
Each section of sewer shall be tested between successive manholes.
Air shall be introduced into the pipeline until 4.0 psi guage pressure has
been reached at which time the flow of air shall be reduced and the internal
air pressure shall be maintained between 3.5 and 4.5 psi gauge for at least
(2) minutes to allow the air tempature to come to equilibrium with the temp-
erature of the pipe walls. Pressure in the pipeline shall be constantly mon-
itored by a guage and hose arrangement seperate form the hose used to intro-
duce air into the line. Pressure in the pipe line shall not be allowed to
exceed 5 psi.
After the temperature has stabilized and no air leaks at the plugs have been
.found, the air pressure shall be permitted to drop and when the internal air
pressure has reached 3.5 psi guage, a stop watch or sweep second hand watch
shall be used to determine the time lapse required for the air pressure to
drop tp 2.5 psi guage.
If the time lapse required for the air pressure to decrease from 3.5 to 2.5
psi exceeds that shown in the following table, the pipe shall be presumed to be
within acceptable limits for leakage.
If the time lapse is less than that shown in the table,-~:the Contractor shall
make the necessary corrections to reduce the leakage to a~ptable limits.
LINE INFORMATION ' TEST RESULTS ? '~. AIR MANDREL
Line! Station # Pipe Diam. L.F. Tested Time Test Test
' Allow. Passed Passed
INCH L.F.
A O+O0 ~n ~+44 1~. 344 COG YR~
INCH L.F.
A 3+44 to 8+34 15 490 COG YES
INCH L.F.
A 8+34 to 11+53 15 319 CO~ VR~
INCH L.F.
B 0+00 to 5+00 ~ 500 CO~ YR~
INCH L.F.
B 5+00 to 6+11 ~ 111 CO~ YES ¥~
INCH L.F. ..
C 0+00 to 5+00 10 500 co~ ¥E~
INCH L.F.
C 5+00 to 5+86 ~ ~6 CO~ YE~
INCH L.F.
C 5+86 to 10+00 8 4]~ CO~ ¥E~
INCH L.F.
C 10+00 to 15+00 8 500 CO~ YES
INCH L.F.
C 15+00 to 19+50 8 450 co~ YES
INCH L. F.
INCH L. F.
INCH L.F.
INCH L. F.
INCH L. F.
INCH L.F.
O~ER Jensen Construction
DATE
PROJECT N~E
Riverchase Dr.
SEWER LINE LOCATION
McArthur & Beltline
7-~0-R7
JOB. NO.
TESTED BY
RAMIRO DEL TORO
Steve
OF III SERVICES~ INC
CITY OF Coppell