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1 Union Ice Company ' 425 North Union Street, Stockton, California Phase II Additional Site Assessment ' Installation of Monitoring Wells and Quarterly Groundwater Report (July, 1993) 1 1 1.0 Project Identification This assessment has been conducted to install additional mora to.-rig wells to 1) further define the lateral and vertical extent of sort and/or groundwater contamination, and 2) to ' determine the groundwater gradient at this site 2.0 Site Description and History Work at the site was initiated in August, 1989, when four (4) underground storage tanks were located on the property These were designated Tanks # I through # 4 Tanks #I and #2 were 10,000 gallon fuel tanks that had been filled with water by Union Ice sometime in the past Tank #3 was a 500 gallon tank that had contained kerosene or fuel oil or diesel fuel Tank#4 was a 250 gallon tank that contained waste oil In September of 1989, these tanks were removed by SEMCO, under permit, and with the direction of the San Joaquin County Environmental Health Division personnel, and disposed of according to law After the tanks were removed, soil samples were taken from beneath all of the tanks It was found that Tanks #1 and #2 had not leaked, however, Tank #4 had either leaked, or had been overfilled A soil sample taken approximately five (5) feet below the bottom of Tank #4 showed "non detect", indicating that the contamination was limited in extent Tank #3 had also leaked and a proposal was submitted to the San Joaquin County Health r Department to excavate the contaminated soil This proposal was accepted and the soil 1 was excavated between January 18 and 24, 1990 Approximately 550 cubic yards of soil which resulted from this work was taken to the Union Ice facility at 1320 W Weber Avenue, Stockton, and remediated at that site This assessment at the Union Street 6I facility was carried out during the period of January 13 through the 21st , 1992 f