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GEOLOGICAL AUDIT SERVICES, INC <br /> FIRST QUARTER 1994 PROJECT REPORT <br /> I <br /> SITE ARCO MINI-MART <br /> ADDRESS 4511 Pacific Ave. Stockton, CA <br /> CLIENT Arthur Wyatt TELEPHONE 951-1207 <br /> LEAD AGENCY SAN JOAQUIN COUNTY PHS/EHD <br /> CONTACT Diane Hinson TELEPHONE 468-3452 <br /> 10 SUMMARY OF <br /> WORK COMPLETED <br /> Monitoring wells MW-1 through MW-3 (Figure 1) were monitored on March 9, 1994 (first <br /> quarter) The depth to standing water was measured in each well using a Solinst water level <br /> meter, and PVC bailers were used to purge the wells of between 9 and 12 gallons of water <br /> prior to sampling (Table 1) Water samples were collected in disposable bailers and <br /> transmitted to WEST Laboratories in Davis, California <br /> 2.0 GROUNDWATER DEPTH AND GRADIENT <br />' Monitoring Date March 9, 1994 <br /> Depth Measurements See Table 2 <br /> I Average Depth 49 32 feet <br /> Gradient 0 0040 ft/ft to N 790 E <br /> Groundwater flow at the site was slightly north of east (Figure 2) This is consistent with <br /> previous monitoring events The monitoring well data sheets are included in Appendix A <br /> 3 0 LABORATORY ANALYTICAL RESULTS <br /> Laboratory results are presented in Appendix B Benzene was detected in samples from <br /> MW-2 and MW-3 at concentrations of 16 ppb and 0 83 ppb respectively TPH as gasoline <br /> was detected in the sample from MW-2 at 51 ppb No petroleum hydrocarbons were <br /> detected in MW-1 The concentrations of all constituents detected are lower than during the <br /> December sampling event Table 3 summarizes the laboratory results <br /> Geolo8inl Aadit Semen Inc <br /> 1614 6941A,—M n.Ma n QM 1 <br /> r <br /> I <br />