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Ms . Casey Foley January 29 , 1991 Page 2 On May 23 , 1990 , Roger Foott Associates , Inc. observed removal of one waste oil tank and one leaded gasoline tank and collected soil samples from beneath the tanks . On June _ 5 , 1990 , Roger Foott Associates , Inc . collected one soil sample from below a former joint in the product dispensing line. Soil sample S-8 . 5-1 was collected from below the former waste oil tank at an approximate depth of 8 . 5 ft below grade, or roughly 2 ft below the base of and below the fill _ port of the former tank. Samples S-13-2 and S-15-3 were collected from the base of the tank cavity after excavating below the former gasoline tank with the backhoe at the turbine (north) and fill port (south) ends of the tank, respectively . Sample S-2-4 was collected from the base of a trench below the location of a joint in the former product delivery line. The sample was collected at a depth of — approximately 2 ft below surface grade. Sample S-8 . 5-1 was tested for total extractable petroleum hydrocarbons (modified Environmental Protection Agency (EPA) Method 8015, extraction by EPA Method 3550) ; for benzene, toluene, ethylbenzene, and total xylene isomers (BTEX) (EPA Method 8020) ; for organochlorine pesticides and polychlorinated biphenyls (PCB) (EPA Method 8080) ; for organic lead using methods recommended by the California Department of Health Services (DHS) , and for the heavy metals cadmium, chromium, lead, and zinc (using atomic adsorption methods) . Samples S-13-2 , S-15-3, and S-2-4 were tested for total petroleum hydrocarbons as gasoline (TPHg) (modified EPA Method 8015, extraction by EPA Method 3550) ; for BTEX (EPA Method 8020) ; and for tetraethyl lead (TEL) and ethylene dibromide (EDB) using methods prescribed by the DHS. All analyses were performed by Mobile Chem Labs , Inc. , of Lafayette, California. ROGER FOOTT ASSOCIATES, INC.