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40 SITE DEMOLITION AND REMEDIATION Between December 1992 and January 1993 the facility was demolished during which two gasoline USTs were removed, all product Imes were removed, a septic tank was removed, the pump islands and station building were demolished, and the station service bay hoists were removed Prior to the removal of the USTs, well MW-3 was abandoned due to its proximity to the anticipated UST excavation Well MW-3 was properly abandoned by filling the well annulus with grout Ii 41 REMOVAL AND OVER-EXCAVATION OF THE USTs At the time of their emoval, the USTs appeared to be in good condition with no visible holes Based n the laboratory analysis of the initial pit bottom soil samples (TP-1 A, TP-1 B, TP-2 1, and TP-2B) the location of the fuel leak appeared to be at the west end of the northern UST Therefore, the leak may have been from the turbine pump or associated piping connected to the northern UST The ansate, tank, and piping manifests and certificates of disposal are presented in the Mittelhauser letter entitled Tank and Stockpile Soil Disposal for the subject site dated March 18, 1994 Following the removal of the gasoline USTs, the area around the tanks was over- excavated to remove hydrocarbon-affected soil The over-excavation was conducted under the direction of a MEttelhauser Geologist A field operated photoionization detector (PID) was used to determine the location of soil containing elevated levels of volatile hydrocarbons The majority of the UST over-excavation was conducted between January 4 and 5, 1993 during which a state of California-certified mobil laboratory (operated by GTEL Environmental Laboratories, Inc ) was onsite to receive and analyze confirmation soil samples The laboratory analytical reports and chain-of- custody documentation are presented in Appendix C /"ittelhauser C 0 z P 0 A + r - 0 P216OR006 W04031%4) 3