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. Page 2 <br /> Hazardous Materials Inspectors for San Joaquin County Public <br /> Health Services, Environmental Health Division. Kent Miller <br /> representing the City of Stockton` s Fire Department <br /> inspected tanks before removal began. Also present was Brett <br /> Hunter representing Chevron U. S.A. <br /> Approximately 265 cubic yards of material was removed and <br /> stockpiled on-site during the UGST and product line removal <br /> and excavation. No visible holes or leaks were observed in <br /> the tanks or lines . <br /> SOIL SAMPLING <br /> Soil samples were collected in clean six inch brass tubes (2 <br /> inches in diameter) , covered at both ends with teflon tape <br /> and sealed with plastic end caps . The soil samples were <br /> labeled, entered on a Chain-of-Custody form, put in a cooler <br /> on ice and transported to GTEL Environmental Laboratories, <br /> Inc . , a State-certified environmental laboratory located in <br /> Concord, California. <br /> UGST Sampling <br /> . Soil samples SW, SE, RW, RE, LW and LE were collected <br /> between one and a half to two feet into native material <br /> beneath each end of the tanks after removal at approximately <br /> 15 feet below grade. An excavator bucket was used to collect <br /> soil from each sample location (figure 2 ) . The samples were <br /> collected by removing the top few inches of soil in the <br /> bucket, then pushing a brass sample tube into the soil until <br /> completely filled. Then handled as described above. <br /> Waste Oil Tank Sampling <br /> Soil samples WON and WOS were collected from approximately <br /> two feet into native material beneath the ends of the tank <br /> at approximately 10 feet below grade ( figure 2 ) . Sample WX-1 <br /> was collected in the sidewall at approximately 8 feet below <br /> grade after minor excavating along the western edge of the <br /> waste oil tank excavation where staining was observed as <br /> requested by Linda Turkatte. <br /> Trench Sampling <br /> Trenches were excavated to expose and remove the underground <br /> product piping extending from the UGST complex to the <br /> service islands . Soil samples P-1 through P-8 were collected <br /> after piping was removed at a depths varying approximately 3 <br /> 1/2 to 6 feet below grade (figure 2 ) . Samples were collected <br /> after piping was removed by digging approximately 1 1/2 to 2 <br /> feet into the native material beneath the bottom of the <br />