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®� Engineers Pianners �" n '� f 1 17 Economists Scientists February 21, 1994 BAE31604.AS.T8 Mr. Michael Collins Environmental Health Division San Joaquin County Public Health Services P.O. Box 2009 Stockton, CA 95201 Dear Mr. Collins: Subject: Quarterly Groundwater Quality Monitoring Results for Del Monte Plant 33, 110 North Filbert Street (Disco Property), Stockton, California This report presents the analytical results for groundwater monitoring wells located at Del Monte Plant 33, 110 North Filbert Street (Disco Property) in Stockton, California. Monitoring wells at Del Monte Plant 33 were sampled on January 11 and 12, 1994 as part of the quarterly groundwater quality monitoring program. Also, on behalf of Del Monte, we wish to thank you for meeting with us on February 16, 1994 to discuss the planned soil and groundwater treatment system for the Disco Property. We look forward to coordinating with you on this project. PROJECT BACKGROUND Del Monte's Plant 33 Disco property is located near the intersection of Myrtle Street and Filbert Street in Stockton, California. Three 10,000-gallon underground gasoline tanks were used by a previous owner of the property and were removed in 1985. A soil and groundwater investigation conducted by CH2M HILL in 1991 revealed that gasoline constituents from the tanks are present in the soil and shallow groundwater. The results of the soil and groundwater investigation are presented in CH2M HILL's "Remedial Investigation/Feasibility Study, Disco Tank Site, Stockton, California (February 1992)" (RI/FS). The groundwater investigation included the installation of eight monitoring wells (Figure 1) i and revealed that gasoline constituents had migrated from the underground tanks into the quartorly.rep CH2M HILL 1717 Broadway,P.O.Box 12681,Oakland,CA 94604-2681 570251-2426 Fax 510 893-8205