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E�ijHEALTH Engineers Planners Economists 93 At G' 30 PM 1 56 Scientists August 19, 1993 SF031604.P3 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 and Conceptual Remediation Plan 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 July 20. 1993 as part of the quarterly groundwater quality monitoring program. This report also presents Del Monte's conceptual plan to remediate the source of gasoline constituents in the subsurface beneath the Disco Property. 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) and revealed that gasoline constituents had migrated from the underground tanks into the quarterly.rep CH2M HILL I 111 Broadway,Sulte 1200,Oakland,CA 94607-4046 510 251-2426 P.O.Box 12681,Oakland,CA 94604-2681 Fax No.510 693-8205