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UNION ICE COMPANY <br /> 425 North union Street, Stockton, CA <br /> Re-excavation Work Plan & <br /> Installation of Additional Monitoring Wells <br /> 1.0 PROJECT IDENTIFICATION <br /> This work plan has been developed to: 1) estimate the amount of residual contamina- <br /> tion associated with the former Tank #3; 2) re-excavate the contamination associated <br /> with the former Tank #4; and 3) to install two (2) additional monitoring wells to deter- <br /> mine the groundwater gradient, along with determining if the groundwater has been <br /> impacted at this site. <br /> 2.0 SITE DESCRIPTION & HISTORY <br /> _ Work at the site was initiated in August, 1989, when four (4) underground storage <br /> tanks were located on the property. These were designated tanks # 1 through #4. Tanks <br /> #1 and #2 were 10,000 gallon fuel tanks that had been tilled with water by Union Ice <br /> sometime in the past. Tank #3 was a 500 gallon tank that had contained both gasoline <br /> and either fuel oil or diesel fuel; tank #4 was a 250 gallon tank that contained waste oil. <br /> In September of 1989, these tanks were removed by SEMCO, under permit, and with <br /> the direction of the San Joaquin County Environmental Health Division personnel, and <br /> disposed of according to law. <br /> After the tanks were removed, soil samples were taken from beneath all of the tanks. It <br /> _ was found that tanks #1 and #2 had not leaked; however, tank #4 had either leaked, or <br /> had been overfilled. Nevertheless, a soil sample taken approximately five feet (5') <br /> below the bottom of tank #4 shows "none detected", indicating that the contamination <br /> was limited in extent. Tank #3 had also leaked and a proposal was submitted to the San <br /> Joaquin County Health Department to excavate the contaminated. soil. This proposal <br /> �. was accepted and the soil was excavated between January 18 and 24, 1990. Approxi- <br /> mately 550 yards of soil, which resulted from this work, was taken to the Union Ice <br /> facility at 1320 W. Weber Avenue and remediated at that site. <br /> Work at the Union Street facility was carried out during the period of January 13 <br /> through the 21st, 1992. <br />