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Mr Travis Bryant Project No 2002-1426-01 February 25, 2000 Page 2 In the vicinity of the site are a former ARCO Service Station, a Chevron Service Station, a Texaco Service Station, The Transmission Shop, and a former Colombo Bakery, all of which have or previously had USTs Based on data collected from subsurface investigations performed at the former ARCO Service Station, the Chevron Station, The Transmission Shop, and the Texaco Service Station, residual and dissolved hydrocarbons have been detected beneath these facilities, and a commingled plume exists beneath Charter Way and Lincoln Street It is our understanding that the groundwater flow direction near the intersection has generally been toward the east and northeast The groundwater plume has not been delineated, but reportedly, extends down gradient as far as Van Buren Street A work plan to further evaluate the extent of hydrocarbon impact, dated January 28, 2000, was submitted to San Joaquin County Department Public Services, Environmental Health Division (PHS/EHS) The scope of work included vertical assessment using CPT followed by discreet soil and groundwater sampling to a total depth of approximately 120 feet bgs The investigation will begin once PHS/EHS has approved the work plan . GROUNDWATER MONITORING On October 11, 1999 a representative from Stratus measured depth to groundwater and collected groundwater samples from the two onsite groundwater monitoring wells for subjective and laboratory analyses Floating product was not observed in any of the groundwater monitoring wells The locations of the monitoring wells are presented on Figure 2 Groundwater Elevation Fourth quarter 1999 groundwater levels were measured on October 10, 1999, using an electronic sounding device, and recorded on the monitoring well data form presented in Appendix A Table 1 presents the historical and fourth quarter 1999 groundwater elevation data At the time of the fourth quarter monitoring event, groundwater was encountered in MW-1 and MW-2 at approximately 20 and 22 feet below ground surface (bgs), respectively Sampling, and Monitoring Program Results Groundwater samples were collected from wells MW-1, through MW-3, on December 6, 1999 Appendix B presents the sampling procedures used Samples were forwarded to Alpha Analytical Laboratory, a State certified laboratory, for analysis with appropriate chain-of-custody documentation C \My Documentsl1BC1Stocktonl4th qtr QMR doc Stratus