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f ' <br /> Ms . Casey Foley <br /> January 29, 1991 <br /> R Page 2 <br /> On May 23, 1990 , Roger Foott Associates , Inc. observed <br /> F1 removal of one waste oil tank and one leaded gasoline tank <br /> and collected soil samples from beneath the tanks. On June <br /> 5, 1990, Roger Foott Associates , Inc . collected one soil <br /> sample from 'below a former joint in the product dispensing <br /> F. line. <br /> F <br /> Soil sample S-8 . 5--1 was collected from below the former <br /> waste oil tank at an approximate depth of 8 . 5 ft below <br /> grade, or roughly 2 ft below the base of and below the fill <br /> F. port of the former tank. Samples S-13-2 and S-15-3 were <br /> collected from the base of the to k cavity after excavating <br /> Fbelow the former gasoline tank with the backhoe at the <br /> turbine (north) and fill port (soth) ends of the tank, <br /> respectively. Sample S-2-4 was collected from the base of a ' <br /> trench below the location of a joint in the former product <br /> `- delivery line The sample was co1llected at a depth of <br /> � + approximately 2 ft ,below surface grade. <br /> Sample S-8 . 5-1 was tested for total extractable i <br /> petroleum hydrocarbons (modified Environmental Protection <br /> Agency (EPA) Method 8015, extraction by EPA Method 3550) ; <br /> for benzene, toluene, ethylbenzene, and total xylene isomers <br /> (BTEX) (EPA Method 8020) ; for organochlorine pesticides and <br /> polychlorinated biphenyls (PGB) (EPA Method 8080) ; for <br /> 4 organic lead using methods recommended by the California <br /> Department of Health Services (DHS) , and for the heavy <br /> metals cadmium, chromium, lead, and zinc (using atomic <br /> adsorption methods) . Samples S-13' -2 , S-15-3, and S-2-4 were <br /> tested for total petroleum hydrocarbons as gasoline (TPHg) <br /> (modified EPA Method 801.5, extraction by EPA Method 3550) ; <br /> ' for BTEX (EPA Method 8020) ; and far tetraethyl lead (TEL) <br /> and ethylene dibromide (EDB) usin�- methods prescribed by the <br /> F DHS.. All analyses were performed by Mobile Chem Labs, Inc. , <br /> of Lafayette, California. <br /> F <br /> I <br /> ROGER FOOTT ASSOCIATES, INC. <br /> F" <br />