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I <br /> GEOLOGICAL AUDIT SERVICES, INC. <br />' FOURTH QUARTER 1993 PROJECT REPORT <br /> 1 <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 /> I <br /> 1.0 SUMMARY OF WORK COMPLETED <br />' Monitoring g (Figure,wells MW-1 through MW-3 1) were monitored on December 3, 1993 <br /> (fourth quarter) The depth to standing water was measured in each well using a Solonist <br />' water level meter, and disposable bailers were used to purge the wells of between 8 and 11 <br /> gallons of water pr}or to sampling (Table 1) Water samples were collected in disposable <br /> lie <br /> bailers and transmitted to WEST Laboratories in Davis, California <br />' 2.0 GROUNDWATER DEPTH AND GRADIENT <br /> Monitoring Date December 3, 1993 <br />' Depth Measurements See Table 2 <br /> Average Depth 517 feet <br /> Gradient 0 026 ft/ft to N 85° E <br /> IGroundwater flow at the site was slightly north of east during the third and fourth quarters <br /> of 1993 (Figure 2) <br /> I <br /> 3.0 LABORATORY ANALYTICAL RESULTS <br /> T v- c,dra ?.re ni -cAntpri in AttnrhmPnt A Nn rnntamnation has been detected to <br /> MW-1 for two consecutive qual ters Gasoline and benzene were again detected in MW-2, <br /> I but toluene was not detected in this quarter MW-3 was much less contaminated than in <br /> previous quarters, only benzene was detected in December Table 3 summarizes the <br /> laboratory results <br /> 6ee1aSo1 Add Semon Inc <br /> I M2-22 43/A—M-M., <br />