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CAMBRIA Investigation Progress SJCPHS/EHD suggests in their February 9, 2001 letter that we have been reluctant to continue investigation or to mitigate the release at this site We are in no way reluctant to proceed with investigation or mitigation as appropriate to this site We submitted our most recent site investigation report on April 14, 2000 and had not received any comments regarding that investigation until SJCPHS/EHD's February 9, 2001 letter We typically like to incorporate local oversite agency comments into our next proposed phase of work to be sure we are proceeding with the same goals and process in mind We now have your comments and are proceeding with the investigation accordingly Furthermore, we have been conducting investigative work at this site In mid December 2000 Cambria initiated a Sensitive Receptor Survey for this site We contacted the California Department of Water Resources (DWR) to obtain well driller reports for water supply wells within a 2000-foot radius of the site We will finalize this survey by conducting a door-to- door survey to identify water supply wells within a 250-foot radius of the site, and we will attempt to field verify the wells identified by the DWR The findings of the Sensitive Receptor Survey will be reported along with the site investigation report generated after performing the work proposed in this work plan (below) SITE BACKGROUND Site Description The subject property is located on the southwest corner of the intersection of Fremont Street and Filbert Street in Stockton, California The site is an operating Shell- branded service station with two underground gasoline storage tanks, one underground waste oil tank, four dispenser islands, and a station building (Figure 2) Previous Investigations Soil samples were collected during an underground storage tank (UST), product line, and fuel dispenser replacement project in April 1996 Total petroleum hydrocarbons as gasoline (TPHg) were identified primarily to shallow soils beneath the northern-most dispenser island near Fremont Street at concentrations ranging from 18 ppm to 6,800 ppm at depths between three and five feet below grade (fbg) Benzene concentrations in this area were at or below 9 2 ppm An elevated concentration of methyl tertiary butyl ether (MTBE) was reported (by EPA Method 8020) in a soil sample, which was collected from the western portion of the former UST excavation at a depth of 19 fbg The MTBE concentration in this sample was reported as 1,800 ppm TPHg and benzene concentrations were below or near detection limits in the soil samples collected from the former UST excavation These data are documented in the Envzros, Inc Underground Storage Tank Removal Report dated June 20, 1996 0797 2