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s I <br /> Page 4 .: TL 686-141-00 1 <br /> } <br /> storage tank . These surface samples were obtained from depths of <br /> I <br /> approximately 6 inches at locations -where the surface baserock <br /> appeared discolored as the result of transformer oil leakage . <br /> I, <br /> The soil samples obtained from the site were transferred to <br /> pre - cleaned glass containers withteflon- lined lids and <br /> immediately cooled to 40C for shipment to our Fresno laboratory . <br /> i <br /> Strict chain-of -custody procedures were followed during the <br /> i <br /> i <br /> transportation and handling of the soil samples . j <br /> 3 <br /> The soil samples were received at our Fresno laboratory on <br /> 'I September 24 , 1986 . Each soil sample was analyzed for the <br /> I <br /> presence and concentration of Polychlorinated Biphenyls ( PCB ) . <br /> i . <br /> The analytical method used during our testing program is <br /> presented below. <br /> Compound Test Method <br /> Polychlorinated Biphenyls A.O.A. C . Method 29 . 013 <br /> A.O.A.C . - American Organization of Analytical Chemists , <br /> 5 . 0 RESULTS AND FINDINGS <br /> The results of the field investigation and laboratory <br /> i <br /> testing program are summarized in the following sections . <br /> _ I 1 <br /> 5 . 1 Soil Profile : The soil profile at the project site <br /> ` consisted of silty sands underlain by clayey silts to the depths <br /> E explored . Natural moisture content remained at moist conditions <br /> 1 <br /> to a depth of approximately 20 feet , the maximum depth explored . <br /> s <br /> r <br /> Fresno Modesto Visalia Bakersfield <br /> i <br />