Big Cedar-CS 910802G OODWIN
ARSHALL
CIVIL ENGINEERS ~ PLANNERS ~ SURVEYORS
August 2, 1991
Ms. Shohre Danshmand, P.F_~
City Engineer
City of Coppell
P.O. Box 478
Coppell, Texas 75019
Sewer Capacity of 10 Inch Sewer Main Traversing Tributary G-1 of Grapevine Creek,
University Park Addition, Coppell, Texas
Dear Shohre:
As you are aware, Goodwin and Marshall, Inc. (G&M) is currently providing engineering services for
the above referenced project. The prospective developers of the tract have requested that I verify
the existing capacity of the 10 inch line, as well as the ability to relocate a portion of the sewer as
it impacts the development. I have discussed these issues with Mr. Howard Pafford. He indicated
that he had no problem with the proposed relocation, as long as the City is provided sufficient acceas
to the proposed sewer line.
Mr. Pafford and I also pulled the construction plans for the line. In the vicinity of the proposed
project the sewer maintains a constant slope of 0.25 percent. This results in a total line capacity of
approximately 710,000 gallons per day. Based on an average per capita use of 325 gallons per
household, together with a peak flow factor of 3.0 yields a total capacity in the line for approximately
730 single family dwellings. Based on current records it appears that there is more than sufficient
additional capacity in this line for the 45 units represented by the University Park addition. Please
verify this fact, so that we can continue the process of developing this property.
I appreciate your assistance in this matter. If you have any questions or comments regarding this
issue, please feel free to call.
Sincerely, ~ /~-t~z, ~
D. Matthew Goodwin, P.E.
DMG/jc
CC:
Mr. Tim House
Ms. Mary Myers
Mr. Fred Joyce
6001 BRIDGE STREET, SUITE 100 / FORT WORTH, TEXAS 76112 / 817-429-4373 (METRO)