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i i i • QUARTERLY REPORT Stewarts Beacon 515 West 11th Street iTracy, CA September 1994 i i1.0 INTRODUCTION In accordance with a request from Mr William Stewart, Geological Audit Services, Inc (GeoAudit) has prepared this report summarizing monitoring activities performed dunng i the third quarter of 1994 at 515 West Eleventh Street in Tracy, California (the site) Mr Stewart is the former owner of Bill's Bait and Beacon, which operated at the site until 1988. Four groundwater monitoring wells at the site were sampled during the third quarter The i location of the site is illustrated in Figure 1 A plan of the site is illustrated in Figure 2 i2.0 BACKGROUND 2.1 Site Location The site is located in a relatively flat business/residential area of Tracy, California (Figure ' 1) The property is located at the intersection of West Eleventh Street and Bessie Street in Tracy The site was formerly a Beacon gasoline station, but is presently vacant Plans are currently underway to construct a new gasoline service station 2.2 Tank Removal ' It is our understanding that three underground storage tanks (UST's) were removed from the site in 1988 Petroleum hydrocarbons were detected in the soil and groundwater samples collected following the tank removal, indicating that an unauthorized release of ' hydrocarbons had occurred Impacted soil was removed and allowed to aerate for more than a year, as the tank cavity remained open Assessment of the extent of release was subsequently ordered by the San Joaquin County Public Health Services - Environmental ' Health Division (PHS/EHD) ' 2.3 Initial Assessment Three groundwater monitoring wells were installed by Geological Technics of Modesto, California (Figure 2) Soil and groundwater samples were collected, and laboratory analyses Cse01091cal Audit Services.Ina 1 STEWARrS BEACON QR51661 5110 94