WA9601B-CS 981002 SHIMEK, JACOBS & FINKI,EA, L.L.P.
CONSULTING ENGINEERS
8333 Douglas Avenue, #820 Dallas, Texas 75225-5816 Fax (214) 361-0204 Phone (214) 361-7900
ROSS L. JACOBS, P.E.
RONALD V. CONWAY, P.E.
JOHN W. BIRKHOFF, P.E.
JoE R. CARTER. P.E. October 2, 1998
GARY C. HENDRICKS, P.E.
I. C. FINKLEA, P.E.
Mr. Kenneth M. Griffin, P.E.
City of Coppell
Post Office Box 478
Coppell, Texas 75019
Re: Sandy Lake Road Water Line (Project WA 96-01)
Plans and Specifications -- Final Review Set
Dear Mr. Griffin:
We are enclosing two sets of final plans and specifications for the completion of the Sandy Lake Road Water
Line, from the Wagon Wheel Ranch Elevated Tank to Denton Tap Road. In addition to the minor
modifications we have made since our submittal last February, the plans have been revised to remove that
portion of the Sandy Lake Road Water Line that was constructed as a change order under the Wagon Wheel
Ranch Elevated Storage Tank project. We believe this submittal represents approximately 95% completion of
the final design phase of this project. If we receive your review comments on this set by early this week, we
anticipate no difficulties in having the final plans and specifications ready for publication by October 9, 1998.
Following are issues and items in which we need further direction from the City, or at least clarification:
1. The pipe material specified is reinforced concrete cylinder pipe, Class 150; or PVC, Class 165,
AWWA C905, DR 21.
a) Does the City want to consider ductile iron pipe as an allowable pipe material?
b) Do you want the contractor to indicate the pipe material with his bid? ~ ~'
2. The City of Coppell Standard Details have been referenced for this project as well as the North
Central Texas Council of Govemments Standard Specification for Public Works Construction. /
a) The set of City of Coppell Standard Details we have in our records is dated March, 1984, and
is not signed and sealed by a Registered Engineer. Is this the most current set of City
Standards? ~
b) The air and vacuum release valve shown on SD-15 is for a 2-inch maximum air valve. We
have recommended a 3-inch valve for this line. Can we supply a special detail which
supersedes this one?
c) The blow-off valve detail in SD-15 is difficult to read on our reduced set. Again~ we can
provide this detail in our construction plans if necessary. c~ S. ~-41?,---.P-- 5, ~
j:\coppell\96*150\letters\corres\~nal2.doc
Mr. Kenneth M. Griffin, P.E.
City of Coppell
October 3, 1998
Page No. 2
d) The embedment details on SDI~o not conform with the language and classes of
embedment called out in the NCTCOG specifications. We recommend using the NCTCOG,
class "C" embedment (Item 6.2.9(c)(11), page 311), for both concrete cylinder pipe and PVC
pipe. We can include a detail of this embedment in our project at your direction.
e) The City's details do not appear to include pavement repair details. Again, we can provide
details for both asphalt and concrete street repair. ~ S~'3 3
3. We have requested a current wage rate from the City's purchasing agent. We will replace the wage
rate in the specifications with the current one prior to advertisement, or by addendure.
4. The specification indicate the contractor is responsible for establishing the horizontal alignment and
vertical grade from control shown in the plans. Is this correct for this project? We can set both
horizontal and vertical control in the field at the City's direction.
5. We have provided for replacement of grass using solid block sod from Station 51 + 10 to 68+75.
Please review and comment. In addition, we have added pay items for repair of sprinkler system
heads and lines in this same vicinity. Is there a homeowners association maintaining this area?? If so,
perhaps they should be contacted and made aware of the pending project.
6. As you head west on Sandy Lake Road, just before the bridge over Cottonwood Creek, there is a sign
on the south side of the road indicating "Nature Area". It is located just before the heavily wooded
and undergrowth area around the bridge. The water line goes through this area and is shifted south to
avoid the future bridge abutments. A significant amount of clearing will be necessary for this
construction. How should this be addressed on the plans? Should the sign be removed sometime
before the start of this project?
Based on the submitted plans, our opinion of probable construction cost for the completion of the Sandy Lake
Road Water Line is in the range of $1,050,000. As a reminder, the portion of the Sandy Lake Road Water
Line constructed as Change Order Number 1 to the Wagon Wheel Ranch Elevated Tank, was completed for a
total of $272,389. The two phases combined total an estimated $1,330,000. We are enclosing an itemized
copy of our opinion of cost for your review along with a summary of the unit cost prices included in Change
Order Number 1 to the Wagon Wheel Ranch Elevated Tank. We are available to discuss this project further
at your convenience.
Sincerely yours,
Gary C. Hendricks, P.E.
Enclosures