SS9401-AG 940208
AGENDA REQUEST FORM
CITY COUNCIL MEKnNG F.......... 8. 19M
ITEM NUMBER
,i V-J ~. ~S- (.1
II
ITEM CAPTION:
Discussion and consideration of sewer improvements.
SUBMI'..n~D BY:
STAFF REP.: ICNln"'h M (".rimn, P R
OTHER REP.:
DATE: NIl.., J, 19M
EV AllJA110N OF ITEM:
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BUDGET AMT.
AMT. FSI'IMATED
AMT. +'- BUDGET
FINANCIAL REVIEW BY
LEGAL REVIEW BY:
AGENDA REQUEST FORM REVISED 2/93
REVIEWED BY CM.
coMMENTS:
MEMORANDUM
Date: February 3, 1994
To: Mayor and City Council
From: Kenneth M. Griffin, P.E., City Engineer
Jim Witt, City Manager
RE: Discussion of Alternatives for Sanitary Sewer System
As the Council is aware, there has been ongoing dialogue between the City of Coppell and the
Municipal Utility District (MUD) concerning property on the south side of Sandy Lake which
is currently served through the MUD. The property is not within the district.
The MUD has recently completed a study to determine its ability to serve its current district and
its ability to annex any additional property into the district. Based on the study, the current
capacity of the system will be met or exceeded at build out of the district. Therefore, the MUD
has stated that it will not be able to annex any additional land into its district. This has created
a situation where there are parcels of land which cannot be served by City services or by the
MUD. In an effort to resolve this problem, the City and the MUD have been meeting to look
at several alternatives to determine if there is a solution to the problem.
Alternative 1:
The City will be reconstructing Sandy Lake Road in the near future; therefore, the first option
explored was the potential of installing a sewer line in Sandy Lake Road from Heartz Road to
the east side of MacArthur Blvd. This would intercept the flow south of Sandy Lake and take
it to the existing lift station on the east side of MacArthur Blvd. It was our opinion that there
was some validity to a system in Sandy Lake Road; therefore, we asked Rady and Associates
to determine if a system could physically be installed in Sandy Lake Road in conjunction with
the existing utilities, proposed cuts, proposed utilities, etc. Rady and Associates examined the
potential for a sewer line in Sandy Lake utilizing the ground survey information they had
obtained for the design of the roadway. Based on a preliminary look at the system, it appears
that a 12" to 15" sanitary sewer line could be constructed in Sandy Lake Road. The sewer line
would be able to take approximately 236 homes off the Heartz Road sewer line and
approximately 275 homes off the Lodge Road sewer line. This removes a total of 511 homes
off of north bound sewer lines that are already experiencing some capacity problems. It also
takes the homes off of the Deforest Lift Station. This frees up additional capacity. Also, during
the actual design of the sewer line, the City would be investigating if any of the property on the
north side of Sandy Lake could be routed to flow south. There appears to be the potential to
pick up approximately 100 homes on the north side of Sandy Lake immediately east of CiCi's
Pizza.
Page Two
Sanitary Sewer
February 3, 1994
The concept of a sewer line in Sandy Lake Road was presented to representatives of the MUD.
While representatives of the MUD were very receptive to a sewer line in Sandy Lake Road, the
initial response was that while we are rerouting sewer and freeing up capacity in north bound
lines and the Deforest Lift Station, ultimately we are not removing anything from the MUD,
only reroufing it and discharging it back into the system at a different point. The point where
we are discharging, i.e. east of MacArthur at the Sandy Lake Lift Station, will also be
experiencing some capacity problems in the near future. It was the opinion of the MUD
representative that if the City were to construct a sewer line in Sandy Lake Road, it would have
a positive impact on the MUD. However, it was their opinion that the City should also be
responsible for some upgrades to the existing Sandy Lake Lift Station and the existing force
main heading south out of the lift station. The estimated cost of those improvements is
approximately $500,000 to $600,000.
Alternative 2:
As an alternative to the Sandy Lake sewer line described under Alternative 1, staff reviewed the
possibility of constructing a sewer line from Heartz Road to Moore Road and turning south at
Moore to Stream G6 which is immediately south of Villawood Lane. At that point the sewer
line can take two directions: (1) Use Stream G6 and tie into the new 30" line south of Bethel
School Road; or (2) continuing down Moore all the way to Grapevine Creek. The approximate
cost of the combination of Moore Road and G6 line is about $1.2 million while the cost of
running the line entirely down Moore Road is approximately $1.6 million. The total length
being constructed entirely on Moore Road is shorter; however, because of the topography of
Moore Road, there will need to be approximately 3300 foot of tunnelling, going down the creek
there would only need to be about 1800 foot of tunnelling. In addition to this construction
project, staff viewed the necessity of constructing another sewer line on Mockingbird which
would cost approximately $200,000. This sewer line will start at Cherrybark and continue south
past Mockingbird Elementary to Hawk Lane, go west on Hawk Lane between some private
residences back to the sewer line in Stream G6. There currently is a sewer line between the two
houses on Hawk Lane and there currently is a sewer line in Stream G6. It is anticipated that
the sewer line needed would be approximately a ten inch sewer line. It will pick up the
remaining homes south of Sandy Lake that are not in the MUD, but are served by the MUD
lines. The reason this alternative was reviewed is its approximate cost and its impact on the
entire system. If we were to take all the property out of the MUD, which would include
building the Moore Road system and the Mockingbird System, the total cost would be
approximately $1.8 million. This might be the cleanest route in terms of short term fixes which
are available.
Alternative 3:
All of the alternatives we have presented to you today cost over $1.5 million. It appears to us
that we should give strong consideration to absorbing the MUD in the very near future rather
than continuing to address this on a piecemeal basis. Beyond the alternatives we have ontlh~d,
there appear to be additional piecemeal solutions which could be proposed. In conversations
Page Three
Sanitary Sewer
February 3, 1994
City Staff has had with the MUD, it has become quite obvious that rapid coordination of MUD
system plans and the City's plans needs to accomplished. The City of Coppell will need to
update our impact fee schedule prior to November 1994. When that study is authorized, it will
give us impetus to coordinate our development plans more closely. Several issues discussed
between the MUD representatives and our staff include an adjustment of MUD boundaries to
allow some of the property north of Bethel Road and west of Coppell Road to influence the
system the City already shows on the master plan. That property naturally flows to our system;
however, it is in the MUD. There was also discussion of whether or not a gravity system needs
to be installed along the north bank of Denton Creek, from the north city limits of Coppell to
Sandy Lake Road. This system could collect from Vista Ridge, the Magnolia property and some
property west of Denton Tap.
At this time, there are approximately five parcels of property on the fringe of the MUD that are
seeking to be annexed. These properties include the Barbara Austin property on Sandy Lake,
Cambridge Estate on DeForest Road, Sonic Drive In on Denton Tap, Rejoice Lutheran Church
on Sandy Lake, and a potential residential development on the northeast corner of Heartz Road
and Sandy Lake.
In summary, after reviewing the alternatives, staff feels Council should seriously consider the
future absorption of the MUD in order to provide impetus toward a coordinated system of
wastewater collection in Coppell. We feel our continued piecemeal approach to this problem
will only prolong the painstaking way development is presently occurring. We stand ready to
answer any questions you might have regarding this situation at your Work Session on Tuesday
night.
KG/JW/kar
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