ST0501-BD111109 (2)ADDENDUM NO. 1
CITY OF COPPELL
DEFOREST ROAD RECONSTRUCTION — PROJECT NO. ST 05 -01
BID NO. 1011 -01
OCTOBER 17, 2011
To: All Plan Holders of Record
This addendum forms a part of the Contract Documents and modifies the Contract Documents
and Specifications as noted below. Acknowledge receipt of the Addendum in the space provided
on the Bid Form and on the outer envelope of the Bid Proposal. Failure to acknowledge receipt
of this Addendum may subject the Bidder to disqualification.
This addendum consists of 3 pages and 2 attachments.
Bidders are directed to revise and /or incorporate into the bid the following items:
Comments and information
1. The secondary bonus (pg 1 -13 Construction Specifications) associated with
construction from Allen Road to Windsor Estates will be paid when construction of two
way traffic is restored on the new concrete street between Allen Road and Windsor
Estates. One -lane traffic utilizing a traffic signal does not constitute two -way traffic. If
the contractor does not restrict traffic to 1 -lane, 2 -way direction outside of daily
flagging operations then the City will pay the full bonus. The contractor may request
payment of this bonus on the following monthly invoice.
2. Any cut in the existing street shall have an approved riding surface of 2- inches of
asphalt within 5 calendar days of opening to traffic. Within the 5 days, flex base
material may be used as a riding surface. No separate payment for flex base material.
In the event rain is either forecasted or has occurred, the contractor shall replace the
flex base material with an asphalt riding surface.
3. Any utility work within MacArthur Blvd. shall have an asphalt riding surface
immediately upon construction of the utility or steel plating if finished concrete is
poured within 3 days.
4. Pay items 233 & 234 for 2 -inch temporary asphalt are a "Plans Quantity
Measurement ". (pg 5 -13 Construction Specifications)
5. The Contractor shall cut and plug and abandon in place the existing storm sewer along
the landscape walls of 603 Prestwick Ct, Lot 1, Block A, in lieu of removal and will be
paid for cut and plug instead of removal. (plans sheet 29 of 79 from Sta 0 +80, 28.9' LT
to Sta 1 +92, 26.4' LT). Additional cut and plug has been provided in the revised bid
schedule
a. All existing storm sewer to be abandoned in place shall be grouted in place with
flowable fill. See specification below for flowable fill. A new pay Item 255 has
been provided with quantity for the 18" storm sewer under Macarthur Blvd. and
Deforest Road Reconstruction
Addendum No. 1 Pagel of 3
the portion of storm sewer near landscape walls of 603 Prestwick Ct, Lot 1, Block
A.
Flowable Fill Specification
This specification identifies the basic requirements for furnishing and placing
flowable fill in all abandoned storm sewer mains Prior to the installation of
flowable fill, the contractor shall compute the theoretical volume of the plenum
for the pipe reach being filled and deliver these calculations to the cit o�ppell
representative This item shall include, but not limited to, the flowable fill which
shall consist of 200 psi slurry and be pumped from the upstream end to the
downstream end of each pipe section. This Payment shall be per cubic foot of
material placed. The price shall be full compensations for flowable fill, pumping,
placing and furnishing all labor, equipment, tools, materials and incidentals
necessary to complete the work.
Mix Designs (Maximum Density)
The mixes fall into the categories of "very flowable" and "less flowable ". The
Contractor shall use a "very flowable" material for filling the void space in pipes
for this particular project
* One cubic yard of very flowable fill will be mixed to contain more than 27 cubic feet due to the additional water.
Above values are based on specific gravities — cement, 3.15: fly ash, 2.27; sand,
2.64; and water, 1.00. Anticipated unconfined compressive strength is 80 psi at
28 days and 150 psi at 56 days.
6. The contractor is not responsible for cleaning and CCTV of existing storm sewers at
time of connection or break -in.
7. Pay Item #252 - Mow strip between spread footing retaining walls shall be 4 -inch thick
concrete with 2 - #3 bars running longitudinal with #3 bars spaced every 24- inches.
8. Construction within MacArthur Blvd. requires arrow boards for traffic control.
9. City of Coppell allows 5 '/2 sack minimum cement concrete mix design for machine
paving. Hand pours will require additional cement per NCTCOG Item 303.5.6.2.
10. Form liner for retaining walls shall have a seamless transition between forms. (5 -11 &
5 -12 Construction Specifications)
Deforest Road Reconstruction
Addendum No. 1 Page 2 of 3
Mix 1
Mix 2
Less Flowable
Very
Flowable
Weights Volume
Weights
Volume
Min.
50 lbs Cement
.25
Min.
50 lbs
Cement .25
Min.
600 lbs Fly Ash
4.24
Min.
600 lbs
Fly Ash 4.24
SSD
2500 lbs Sand
15.17
SSD
2500 lbs
Sand 15.17
55 Gal
458 lbs Water
7.34
65 Gal
541 lbs
Water 8.68
Total Cubic Feet
27.00
*Total Cubic Feet 28.34
* One cubic yard of very flowable fill will be mixed to contain more than 27 cubic feet due to the additional water.
Above values are based on specific gravities — cement, 3.15: fly ash, 2.27; sand,
2.64; and water, 1.00. Anticipated unconfined compressive strength is 80 psi at
28 days and 150 psi at 56 days.
6. The contractor is not responsible for cleaning and CCTV of existing storm sewers at
time of connection or break -in.
7. Pay Item #252 - Mow strip between spread footing retaining walls shall be 4 -inch thick
concrete with 2 - #3 bars running longitudinal with #3 bars spaced every 24- inches.
8. Construction within MacArthur Blvd. requires arrow boards for traffic control.
9. City of Coppell allows 5 '/2 sack minimum cement concrete mix design for machine
paving. Hand pours will require additional cement per NCTCOG Item 303.5.6.2.
10. Form liner for retaining walls shall have a seamless transition between forms. (5 -11 &
5 -12 Construction Specifications)
Deforest Road Reconstruction
Addendum No. 1 Page 2 of 3
11. Pay Items #250 -251 No substitute allowed for truncated dome pavers for barrier free
ramps unless mockup provided and approved by the City.
12. At the southern median nose of MacArthur Blvd at Deforest Road the storm sewer
manhole elevations were verified not to be in conflict with the pavement. (sheet 15 of
79)
13. Traffic Signal Cabinet shall be Naztec 70006 - Coppell and not "LWSVL ". (sheet 37 of
79)
Attachments:
1. Revised Bid Proposal (Sheet 17 through 37)
2. TXDOT PR -1 rail detail
End of Addendum No. 1
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Deforest Road Reconstruction
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