Bay Area Business Park, Phase I & II
GES was selected as the Geotechnical Engineering and Construction Materials Testing firm for the two construction phases on this Pasadena, Texas industrial park facility. Phase I was completed in 2008 and consisted of three tilt wall construction warehouse buildings totaling 1,100,000 SF with 1,000,000 SF of heavy duty paving. Phase II geotechnical engineering was completed in Fall 2014 and Phase II construction of four warehouse buildings totaling 830,000 SF is underway.
Soils encountered at the site are of very high plasticity and prone to significant swelling with changes in moisture. To reduce the calculated potential vertical rise (PVR) to one-inch or less within the building pads, four feet of subgrade improvement was recommended. Stabilization of onsite soils for use as select fill was originally ruled out because high lime addition rates were anticipated, making treatment more expensive than importing select fill. GES performed extensive lime-stabilization testing on the soils, determined that a lime application rate of 4-percent would reduce on-site soil plasticity indices to acceptable levels, and developed and implemented a quality control protocol for assuring proper placement. Construction cost savings exceeded $1 million. Lime-stabilization of building pad fill materials was implemented during both construction phases.
The CMT inspection scope for the Phase II building includes monitoring of over 120,000 CY of building pad earthwork, private utilities, drilled piers, reinforcing steel, slab on grade and tilt wall panel concrete, fireproofing, masonry, and structural steel inspections. The CMT inspection scope for the Phase II paving includes monitoring of 1,200,000 square feet of heavy duty paving with chemically stabilized subgrade.