WA0003-CS010711 BIRKHOFF, HENDRICKS & CONWAY, L.L.P.
CONSULTING ENGINEERS
7502 Greenville Ave., #220 Dallas, Texas 75231 Fax (214) 361-0204 Phone (214) 361-7900
$oh~ w. mr,~om P.~. I~ Pc O 0 - 0 ~
RoN~D v. CONWAY.
GARY C. ~CKS, P.E.
JOE R. C~R, P.E.
PAUL A. CA~, P.E.
~TT HIC~Y, P.E.
aoss [. JaCOnS, ~.u. July 11,2001
1. C. F~EA, P.E.
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Mr. Glenn D. }-~lowell, P.E.
Assistant Dir/erctor of Public Works
City of Co[7~eli
732 Defopst Road
Coppell,/I'exas 75019
Re: Fire Hydrant Pressure Recorders
Pressure Readings
Dear Mr. Hollowell:
As you requested, we deployed the six (6) fire hydrant pressure recorders at the locations shown on the
attached meter location map (First Location) on June 7, 2001. The fire hydrant recorders were relocated on
June 25 (Second Location) and again on July 5, 2001 (Third Location) to the locations shown on the attached
meter location map.
On the June 14, 2001, June 25, 2001, June 29, 2001, and July 5, 2001 the data was downloaded from the
pressure recorders. Using the data, we have prepared the two (2) copies of the enclosed six charts for each
date for your preliminary review and evaluation, illustrating the pressures encountered at the meter locations.
Through conversation with the manufacturer of the pressure recorders, we have discovered that the meters
were programmed as 100 psi meters instead of 200 psi meters. This caused the pressure meters to register
and record pressures that were one-half the actual pressure. This is why the previously submitted pressure
charts appeared extremely low for the selected locations. The six pressure meters have since been
reprogrammed by our firm to record actual pressures.
Our next meter reading is scheduled for this Friday, July 13, 2001, but will not require City personnel
participation. Our next meter reading and meter relocation that will require the City's assistance is
scheduled for Monday, July 23,2001 at 6:30 a.m. A representative of our firm will call to coordinate this
assistance.
We are available to discuss this project further at your convenience. Sincer y~~/~...~/~ ~ /
c:losures
Mr. Kenneth M. Griffin, P.E.
j \clerical\coppellL2001-106\letters\corres~kXsecond week th readings.doc