Item 4CCity of Southlake, Texas
M E M O R A N D U M
To: Shana Yelverton, City Manager
From: Jim C. Blagg, Assistant City Manager/Director of Public
Safety
Subject: Approve an Agreement with CTL Thompson, LLC for
Materials Testing in the Amount of $53,338.
Action
Requested: Approve an Agreement with CTL Thompson, LLC for
Materials Testing in the Amount of $53,338.
Background
Information: As a part of the overall construction of the new DPS
Headquarters, it is important for the City to have
additional inspections to ensure that the construction is
being done in full compliance with the specifications.
The Board wanted to be sure that, in addition to the City
own Building Inspection reviews that they had an
independent review of all of the major construction
components. This contract will provide the following:
Observation and Density Testing of Fill and Backfill: A
representative of CTL will be available on a part-time
basis during placement of fill and backfill to observe
progress and methods and to perform moisture density
tests as required. We will rely upon the Client or
Contractor to notify CTL at least 24-hours in advance of
when services are required. Testing methods used will
be conducted in general accordance with project
specifications and ASTM standard test methods. Other
laboratory testing will be conducted as deemed
necessary, or as requested by the Client, to evaluate
conformance of fill materials with project specifications.
Reports, reviewed and signed by a licensed professional
engineer, will be mailed to the Client following each site
visit.
Drilled Pier Observation: A representative of CTL will be
available on a full-time basis to observe drilled pier
installation. We will rely on the Client or Contractor to
notify CTL at least 24 hours in advance of when services
are required. While on site CTL will observe piers for
depth, bearing stratum, penetration, plumbness, and
reinforcement. Reports, reviewed and signed by a
licensed professional engineer, will be mailed to the
Client following each site visit.
Reinforcing Steel Observation: A representative of CTL
will be available on a part-time basis to observe
placement of reinforcing steel in cast-in-place concrete
members. We will rely upon the Client or Contractor to
notify CTL at least 24-hours in advance of when services
are required. Reinforcing steel placement will be
inspected for compliance with approved structural and
shop drawings, including bar size, spacing, clearance
and splice lengths. Post tension strand tensioning will
be inspected for proper jacking force and strand
elongation. Reports, reviewed and signed by a licensed
professional engineer, will be mailed to the Client
following each site visit.
Concrete Testing: A representative of CTL will be
available on a part-time basis to perform concrete
testing as required by project specifications. We will rely
on the Client or Contractor to notify us at least 24-hours
in advance of when services are needed. A copy of
Information regarding each test will be given to the
Contractor at the job site the day the concrete is
sampled. Four (4) cylinders will be cast in the field for
each test. Cylinders will be cured initially in the field for
the first 24-hours in a water tank, or other storage
container suitable to maintain a reasonable curing
temperature. Cylinders will be picked up by a
representative of CTL the following day and returned to
our laboratory for curing and testing. Reports, reviewed
and signed by a licensed professional engineer,
summarizing the results of our tests will be mailed to
the Client following strength testing at 7 and 28-
days.
Masonry Testing: A representative of CTL will be
available on a full-time basis, during grouting of
structural masonry, to perform masonry observation
and testing as required. We will rely on the Client or
Contractor to notify us at least 24-hours in advance of
when services are needed. CTL will observe placement
of reinforcement, verify clean-outs, and observe
grouting operations. Six (6) mortar cubes, 4 grout
prisms, and 8 masonry prisms (4 hollow block and 4
grouted block) will be cast in the field for each 5,000
square feet of structural masonry, and will be stored on
the site for the required field curing time.
Samples will be picked up by a representative of CTL
the following day and returned to our laboratory for
curing and testing. Reports, reviewed and signed by a
licensed professional engineer, summarizing the results
of our observations and tests will be mailed to the Client
following strength testing at 7 and 28-days.
Visual Weld Observation: A representative of CTL will be
available on a part-time basis for Visual Weld
observation. CTL will visually observe and test bolted
and welded connections and metal decking for
compliance with project drawings and specifications. A
list of outstanding discrepancies will be maintained at
the project site. A report summarizing the
results of our inspections will be mailed to the Client
following each day's visit.
Observation & Testing of Sprav-Applied Fireproofing: A
representative of CTL will be available on a part-time
basis for Fireproofing testing. We will rely on the Client
or Contractor to notify us at least 24-hours in advance of
when services are needed. CTL will perform fireproofing
thickness and density tests as required by project
specifications. A report summarizing the results of our
testing will be mailed to the Client following each
day's visit.
Financial
Considerations: The cost of this agreement is $53,338 and will be
included in the CIP with the construction costs.
Citizen Input/
Board Review: Crime Control and Prevention Board approved the
agreement 5-1.
Legal Review: This agreement has been reviewed by Steve Wood at
TOASE.
Alternatives: Rely on the testing performed by the contractors
Rely on the inspections performed by the City of
Southlake Building Inspection Services
Supporting
Documents: Attached agreement
Staff
Recommendation: Approve an Agreement with CTL Thompson, LLC for
Materials Testing in the Amount of $53,338.
Staff
Contact: Jim C. Blagg, Assistant City Manager/Director of Public
Safety