Lake Park-CS 900402 "'")AN M. DOWDEY & ASSOCIATES '~' ~:~'¢.-- d'¢ ~
DALLAS. TEXAS 75248
(214) 931-0694 ~ P~ ~ '
255 Parkway Blvd. 3 ~
Co~pe11, ~exas
Coppe11, ~exas
Dea~ Shoh~e:
A~te~ the Na~ch 29, 1990 D.R.C. mee~&~g, ~ ~e~e~e~ the co~ents that were
suggeste~ b~ the Cit~ Sta~ an~ the~ consultant. ~ ha~e concerns about the
~ollo~ing &ssues.
1. ~ ha~e app~ox&mately eleven locat&ons ~he~e the cente~l&ne ~a~&us &s less
425 ~eet. ~he ~eason ~o~ th~s 8ec~ease~ ~aS&us &s to accomo~ate the ~es&gn
o~ the ~nal pla~ base~ on the app~o~e~ p~el&m~na~ plat. ~ usea an
acceptable ~aS~us to most c&ties, such as ~lano and the Cit~ o~ Dallas.
· he subdl~&s&ons &n the C&t~ o~ Coppel~ l&stea be~o~ ha~e ~ad&~ simila~
to those ~n ~uestion.
S~Ug~ B~D. ~ NacAU~UA
SBADO~DG~
SBS~OOD ~ S~C~O~ 1
W~O~OOD ~O. 2
Cont ' d
We could ask for a variance from the Subdivision Ordinance, however, I did
not notice any variances listed on the final plat for these Subdivisions.
Please consider this issue at the staff level to avoid a variance request.
2. The centerline radius selected for the sanitary sewer lines was selected
based on the engineering criteria that P.V.C. pipe manufacturers recommend.
I am requesting that we be allowed to develop our system for the following
reasons.
A. By locating the sewer lines (and water) parallel to the curb lines, the
following construction related items are enhanced.
a) Repair of the system is easier because you limit the irregular trench/
pavement locations. This allows for a regular sawcut (if necessary)
pattern.
b) Other utilities can be prepared to locate their facilities a given
distance from the City facilities.
c) As long as minimum radius criteria is met, you avoid excessive use
of manholes, an area that is susceptable to clogging.
d) All service repair occurs at a uniform distance from the curb line.
e) Initial construction reduces the number of situations where manholes
would be located in pavement and/or sewer mains falling in front yard
easements.
B. The additional cost of manholes is significant in subdivisions with
curvilinear streets.
C. Additional manholes require additional grade differential (enter/outer)
where slope is extremely critical.
D. The only advantage of straight alignment is for "cross-country" installation
where a curb line is not present to locate the system.
3. Mr. Glen Hinckley, Univest Properties, Inc. has an agreement with the City
of Coppell whereby he is allowed to make certain development decisions based
on the 1982 Subdivision guidelines. This includes the allowable 1 foot
increase (FEMA standard) in the water surface and the allowance of
0.30% street grades (although we do not have any grades that are this
flat).
I feel that we have addressed your concerns, and we are submitting two sets
of plans for your review.
Very truly yours,
William A. Anderson, P.E.
WAA: