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V�Vvly- <br /> A S S Q C I A T E S I N C <br /> during that event Groundwater samples from vapor wells VW-2d, VW-4, and VW-5d did <br /> contain detectable concentrations of MTBE in November 1997 and these results were confirmed <br /> by EPA Method 8260 Results of laboratory analyses are summarized in Table 2. <br /> SUMMARY <br /> The groundwater flow direction and gradient were consistent with those evaluated during <br /> previous events Dissolved gasoline hydrocarbons were detected in the sample from well MW-1 <br /> Dissolved hydrocarbons in the diesel range were detected in the samples from wells MW-1 and <br /> MW-3 during the reporting period BTEX constituents were detected in wells MW 1, MW3, and <br /> MW4 MTBE was detected in the sample from well MW-4 at a concentration of 250 ppb <br /> If you have any questions with this project, please call our Modesto office at (209) 579-2221 <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> D, L <br /> Drew Van Allen �QQRO�ESSIp�y� <br /> Staff Scientist E <br /> vIiCi► 11.11 <br /> No.CO 1'� 0 <br /> Exp. <br /> Jeanne Hornsey <br /> Zj 7� <br /> CA Registered Civil Engineer No 47414 `f`l' CIVIC. \Q' <br /> cc James Giottonmi, City of Stockton <br /> Mark List, CRWQCB Central Valley Region <br /> Attachments Table 1 Groundwater Elevation Measurements and Subjective Analyses <br /> Table 2 Results of Laboratory Analyses of Groundwater Samples <br /> Figure 1 Site Vicinity Map <br /> Figure 2 Generalized Site Plan <br /> Figure 3 Potentiometric Surface Map, December 22, 1998 <br /> Attachment 1 Field Procedures <br /> Attachment 2 Groundwater Monitoring Data and Purge Logs <br /> Attachment 3 Laboratory Analysis Reports <br /> w 162574162574 0119436714QSR98doc 3 <br />