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GeoStrategies Inc. <br /> Gettler-Ryan Inc <br /> January 15, 1992 <br /> Page 2 <br /> FIELD EXCAVATION ACTIVITIES <br /> The waste oil tank was removed December 30, 1991. Tank removal and soil <br /> sampling was witnessed by representatives of the Stockton Fire Department and <br /> the San Joaquin County Public Health Services Environmental Health Division <br /> The excavation was approximately 10 foot wide by 13 foot long by 4 foot <br /> deep An estimated total of 15 cubic yards of soil was removed and placed in <br /> two small on-site stockpiles The tank had been breached when discovered and <br /> had an additional 3-inch by 5-inch hole in the top of the tank. Rust covered <br /> the entire tank The top of the tank was removed by the contractor to facilitate <br /> removal of the contents <br /> SOIL SAMPLING <br /> Soil samples were collected by pushing a stainless steel sample tube into the <br /> soil until completely full The ends of each tube were covered with teflon tape <br /> and sealed with plastic end caps. The sample was then labeled, placed in a <br /> cooler on blue ice, entered on a Chain-of-Custody form and transported to <br /> Western Environmental Science and Technology (WEST), a State-certified <br /> analytical laboratory located in Davis, California <br /> Stockpile samples were collected by removing the top 6 to 12 inches of soil, <br /> then pushing the tube into the soil This method was repeated three times on <br /> the same stockpile until the tube is completely full. It was then handled as <br /> described above <br /> Excavation Sampling <br /> One excavation sample (CW-1) was collected from beneath the waste oil tank at <br /> a depth of approximately 6 feet below grade (Plate 3) The sample was <br /> analyzed for Total Petroleum Hydrocarbons calculated as Gasoline (TPH- <br /> Gasoline), Diesel (TPH-Diesel) and Oil (TPH-OA) according to EPA Method <br /> 8015 (Modified), Benzene, Toluene, Ethylbenzene and Xylenes (BTEX) <br /> according to EPA Method 8020, Halogenated Solvents (Cl HC) according to <br /> EPA Method 8010, Oil and Grease (O&G) according to ASTM Method 5520 <br /> E&F) ICAP Metals by atomic absorption (EPA Method 7000) and Semi-Volatile <br /> Organic Prionty Pollutants according to EPA Method 8270 <br /> 729501-1 <br />