Hager Container-CS 880822 (2)August 22, 1988
ROBERTS & D0WDEY CIVIL ENGINEERS
16200 Dallas Parkway, Suite200 -- Dallas, Texas 75248 -- (214)
Mr. Steve Goram
Director of Public Works
255 Parkway Blvd.
Coppell, Texas 75019
RE: Hager Containers Addition
Coppell, Texas
Dear Steve:
I appreciated the opportunity to meet with you and Howard Pafford, Water
Utilities Foreman on August 18, 1988 to discuss the issue of full flow
meters on Fire Line Systems. As a result of our meeting, the following
comments and concerns were presented both from your perspective and from
the Developers perspective.
The purpose of this letter and the aforementioned meeting is to resolve
any concerns you might have in a satisfactory situation for both parties.
We would prefer to seek your approval to Variance No. 1 of the Hager
Containers Addition, prior to the City Council meeting on September 13,
1988, due to the technical nature of this request.
As I understand the City's policy, you require that any water system that
is private be metered. This policy was established to prevent any unme-
tered flows on private property. As a result of this policy, the devel-
oper is required to provide a network of double check valves, detector
check valves and a full flow meter as shown on Standard Construction Detail
Sheet SD-18 dated March, 1984 and revised in October, 198S on all systems.
The "double check" assembly is designed to protect against objectionable
backflow contaminating the potable water system.
The "detector check" detects leakage or unauthorized use of water. A bypass
meter is generally connected to this part which will monitor low flow rates.
Once the pressure loss through the bypass approximates 4 psi, (may vary
depending upon manufacturer), the mainline valve automatically opens allow-
ing unrestricted flow. This flow through the mainline valve is not registered.
The "detector water meter" basically functions as the previously discussed
"detector check" except that it registers flows over a wide flow range where
accuracy is essential.
ACREY, ROBERTS & PIERSON, INC. THREADGILL-DOWDEY & ASSOCIATES
August 22, 1988
Mr. Steve Goram
Page 2
The "detector-double check" serves basically two purposes. It will detect
leakage or unauthorized use of water as a detector check and will protect
against objectionable backflow contaminating the potable water system.
Please consider the allowance of the "detector-double check" in lieu of the
system as shown currently on Standard Detail Sheet SD-18.
Attached is a print of the water and sanitary sewer plan with the system we
are proposing. Please review the plan and coordinate with the Fire Marshall
regarding his requirement.
Please contact me if you have any questions regarding our request.
forward to receiving your comments.
Sincerely, , /7
William A. Anderson, P.E.
I look
WAA/dkb
Enclosure