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®' Engineers Plonners Economists Sclentlsts August 30, 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 and Annual Groundwater Quality Monitoring Results and { Remediation Status for Del Monte's Disco Property at 110 North Filbert .,. Street, Stockton, California This report presents the analytical results for groundwater monitoring wells and a summary of remediation activity at the above referenced site. Monitoring wells were sampled on Ju1�20, 1994 as part of the quarterly and annual groundwater quality monitoring program. 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)" (RIMS). 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 shallow groundwater. The shallow groundwater surface was found to exist at approximately 75 feet below ground surface within fine sandy silts, clayey silts and sand. Groundwater was observed to flow northwesterly at a gradient between 0.0005 and 0.0013. CH2M HILL 1711 Broadway,R0.Box 72681,Ookland,CA 94604-2681 510251-2426 Fox 510 893-8205