SS9901-CS040617 (2) 9055601948
06,'17,'2~04 13:14 FAX 9035601948
JACOBS IBPS
Turner Collie(. Bmden lnc
Engineers · Planners · Project Managers
17300 Dallas Parkway
Suite 1010
Dallas, Texas 75248
972-735-3000
Fax: 972/735-3001
DATE: June 17, 2004
TO: Rick O'Dell
City of Coppell
FROM: Erika Cooper
# OF PAGES (including this page): 3
FAX NUMBER: 972-304-3679
PHONE NUMBER: 972/735-3056
(If bansm~al Is incomplete or unclear, please
call sender directly at tl~is number.)
REMARKS:
Rick,
The following is our response to RFI No. 1 from S.J. Louis, sent to them via fax this
morning. I will also be sending them the details for the thrust blocks on the HDPE
sections. If you have any questions, please feel free to contact me at 972-735-3056
(office) or 469-387-8956 (cell).
Thanks,
Erika Cooper
An AECOM Company
(16,'17,2004 13:14 FAX 9035601948 JACOBS IBPS
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06,'17/2004 13:14 FAX 9035601948 JACOBS IBPS ~03
DeForest and Sandy Lake Wastewater Lift Stations and Force Main Improvements
Force Main Line A&B RFI No. I
Response Date: June 17, 2004
]'CB Project No. 052.131124.0001.04000.A 123
This Il. FI response includes the following: · Conversion of three locations to horizontal directional drilling (HDD), and
· Downsizing of bored steel casing diameter.
Horizontal Directional Drilling
It is TCB's opinion the request for the proposed alternate construction method of HI)PE by
directional drilling for the three sections i$ technically acceptable provided the following conditions
are met:
This proposed altarnatc construction method results in no additional contract time or cost
to thc Owner.
- The Contractor shall prepare proposed plans showing the horizontal and vertical
alignments for these three sections_ These shall be in the form of marks on the plans.
Clearly show where the DIP transitions to HDPE. Show thrust anchors at each end of the
HDPE. The details for the thrust res~aint anchors are included in Attachment A to this
response. These plans shall be reviewed with TCI~ and the City's Inspector prior to
beginning directional drilling, Requfl'ed clearance of the new force main below existing
utilities shall be 10 feet desired, 8 feet minimum, The pipe manufacturer's recommended
minimum bend radius for the 20-inch DR17 HDPE piping is 27 times the pipe outside
diameter for piping and 100 times the pipe otnside diameter at flange adapters. These
minimum radii shall be maintained at all times. Air release valves must be provided at all
high points.
· Once directional drilling ora section is complete, the Contractor shall provide as-built
data for the actual hori2omal and vertical alignments installed. This data shall be in the
form of marks on the plans. TCB will use these marks in drafting "record drawing" plans
for the City at thc completion of the project. Survey data (coordinates and bearings) will
be reqnircd.
· /CB has not reviewed the experience, qualifications, or equipment of the proposed
horizontal drilling sub-contractor.
Downsizing of Bored Steel Cas ng Diameter
TCB has no objection to downsizing of the bored steel casing diameter as proposed by the
Contractor, with the understanding that the Contractor assumes fidl responsibility for the more
difficult installation in smaller casing
The total amount of the savings, as calculated by S.J_ Louis, is $13,420. The proposed split of 1/3 of
the total savings to the City, 1/3 to S.J. Louis, and 1/3 to the subcontractor is not acceptable. The
City should receive one-half of the total savings ($6,710), or the diameters of the steel casings shall
remain 36-inches and 48-inches. Please acknowledge acceptance of the revised savings.
if you have any further questions, please feel free to contact George Cisneros at 972-735-3074.
Rick O'Dell, Project Inspector City of Coppell
Ted Sugg-
Erika Cooper - TCB