SPECIFIC EXPLANATION: The General Services Department recommends that City Council approve a First Amendment to the construction contract with AIA General Contractors, Inc. to increase the director’s authority to approve Change Orders up to 15.6% of the original contract price. The requested appropriation is necessary to address the following unforeseen condition, which will exceed the original 10% contingency.
During excavation and removal of the underground storage tanks, a loose, saturated, sand layer was encountered, causing the excavation to become larger than necessary and to potentially undermine adjacent structures. Installation of a slide-rail shoring system will stabilize the collapsing excavation and prevent further expansion.
PROJECT LOCATION: 3100 Laura Koppe Road, Houston, Texas (Key Map 454-E) PREVIOUS HISTORY AND PROJECT DESCRIPTION: On July 8, 2015, Ordinance No. 2015-650, City Council awarded a construction contract to AIA General Contractors, Inc. to provide construction services for remediation, removal and installation of underground storage tanks (UST) at Fire Station No. 34 for the Houston Fire Department. The scope of work consists of removing two 1,000 gallon gasoline USTs, along with associated appurtenances and installing one 5,000 gallon gasoline, double-wall fiberglass reinforced plastic, two compartment UST, backfilling and compaction, waste classification, loading, hauling and proper disposal.