ST0004-CS010511QUANTUM CONTRACTING, INC.
P. O. BOX 430
ROCKWALL, TX 75087
ST 00 -01-
OFFICE - 972 - 771 -9511
FAX - 1- 972 - 722 -1114
,
May 7, 2001 t k
Ken Griffin, City Engineer
City of Coppell
P O Box 478
Coppell, TX 75019
( 0
RE. Freeport Parkway Paving Improvement, ST00 -04
Mr. Griffin,
At the pre - construction meeting I was instructed by yourself and Larry Davis that the City
required a full size paver (form -rider or slip -form) on the longer repairs, referencing a NCTCOG
specification. I explained that when I estimated and priced the proposal I did so anticipating using
a vibrating screed pouring one lane at a time just as other rehab and repair projects are done in the
metroplex. There are nine (9) repair areas which exceed 100' in length but do account for the
majority of the repair area.
I respectfully request the City reconsider and allow the screed to be used on all of the repair areas
for the following reasons:
Full -size pavers work well on new construction and on highways where access is not a
problem where long runs justify the set -up and where structures and appurtenances do
not impede the route. I presently own both a single lane and dual lane paver and will
use them if required. However, in this application, it will take more time and expense
and not necessarily result in a better finished product.
2. The use of a paving machine will require the removal of 2' -3' of additional material
behind the curb in order to make room for the tracks or wide base forms required. On
the outside of Freeport Parkway, there is a total of twenty -four (24) curb inlets plus
power poles, water meters, telephone pedestals and cable, guard rail, anchise utility
vaults, etc. within 3' of the curb. On the median side, the existence of left turn lanes,
intersections and concrete median cap would require constant Irmonfikuration of the
machine. The result will be considerable collateral d e cold joints in the
pavement, longer construction time and extra expen f oval and replacement of
landscaping, etc.
3. We purchased a new heavy vibrating screed and 2000 lineal feet of new steel forms last
year. The screed including the engine, hydraulic system, vibration system and frame
weighs approximately 4,000 lbs. for a 20' section. We have a skilled crew who is
comfortable with the machine and will deliver a product which will test and look as
good as that poured with a large machine.
4. The attached COG specification (Item 5.8.3) appears to accept a vibrating screed as an
acceptable method for concrete finishing.
Enclosed is a mix design from Pioneer concrete which will be submitted along with several others
for your approval. The test history of this 6 sack design poured at a slump of 3 -6" produces 7
day results consistently in excess of the 3500PSI required at 28 days. I will agree to pay for the
extra cement and go to a 6 1/2 sack design to be poured at a 5" slump with the screed. We will
hand vibrate full depth of the 8" mat ahead of the machine. If for any reason the tests show any
lack of consolidation, separation of aggregate or deficiencies in strength or finish, we will modify
the material or procedure until all requirements are satisfied.
Your consideration is appreciated.
Sincerely,
PG�
.J. vans, Jr.
Vice President
c: Larry Davis, Inspector