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APR-30-97 10:01 AM RODGERS CONSTRUCTION 209 464 5782 P.05 <br /> 16. • ! <br /> ATTACIIR-IENT I <br /> k:NANIPLE OF NARRATIVE WORK DESCRIPTION <br /> On June 1, 1994 gasoline fuel contamination was disco% -red beneath two 10,000 <br /> gallon gasoline tanks. Both soil and groundwater were contaminated by the tank leaks. <br /> hegasoline fuel apparently migratectfvertically from the incident area through the <br /> engineered fill material to the underlying bedrock. Upon encountering bedrock, the <br /> gasoline fuel then apparently migrated laterally east alon; the bedrock surface <br /> oft-site. A chronology of the incident, including owner reporting, regulators; action:, <br /> and emergency remedial action measures is presented in Appendix A (not shown in <br /> this example). The following actions were taken by (consulting firm) which was the <br /> lowest of three bidders retained to assist in the assessment and clean-up of the <br /> incident: <br /> Investigation activity details (include .appropriate dates): <br /> • A soil probe survey was conducted consisting of en samples with 18" soil <br /> probes. <br /> • Seven soil borings were drilled to 60 feet with ai: 8" hollow stem augr drill. <br /> • 84 soil lab samples were analyzed for Total Petroleum Hydrocarbons and for <br /> BTEX. (lab invoices included) <br /> • Three of the soil borings were converted to welly and two additional wells were <br /> installed at 70 feet. <br /> • Five wells were sampled quarterly over the tours , of one year. (lab invoices <br /> included) <br /> • A 8 hour soil venting pilot test was conducted or the soils. <br /> • A 48 hour aquifer test was conducted. <br /> Remediation activities details (include appropriate dates) <br /> • 500 cubic yards of soil were excavated and bioremediated, followed by cla s <br /> (III) disposal. <br /> • A soil vapor extraction system was installed and operated for 12 months. <br /> • Groundwater was pumped and treated by carbon Asorption for a period of 12 <br /> months. <br /> • Five confirmation borings were drilled to verify that soil was remediated. <br /> • Verification groundwater sampling was conducted for four quarters followl ig <br /> the cleanup. <br /> The contamination assessment and cleanup was conducted under the direct supervi •ion <br /> of a State of California Registered Engineer/Geologist who has five to ten years o' <br /> professional experience in groundwater hydrogeology. <br />