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(YVATC <br /> A S S O C I A T E S I N C <br /> concentrations of petroleum hydrocarbons and was discharged . to the ground surface. <br /> Groundwater well purge and sample logs are provided in Appendix A. <br /> The groundwater samples collected from each well were submitted with Chain of Custody Record <br /> to Sequoia Analytical in Redwood City, California, ELAP Certification No. 1210. The samples <br /> were analyzed for TPHg and BTEX/MTBE by EPA methods 8015 and 8020, respectively. <br /> Groundwater analytical results are summarized in Table 2. The laboratory analytical reports are <br /> included in Appendix B. <br /> RESULTS OF LABORATORY ANALYSES <br /> Results of the laboratory analysis of groundwater samples from the monitoring wells indicate the <br /> presence of petroleum hydrocarbons in groundwater from monitoring wells MW-2 and MW-3. <br /> TPHg and BTEX concentrations in wells MW-2 and MW-3 decreased since last quarter. No <br /> petroleum hydrocarbons were detected in monitoring well MW-1. The analytical results are <br /> summarized in Table 2. <br /> If you have any questions or comments regarding this matter please contact our office at (209) <br /> 579-2221. <br /> Respectfully submitted, <br /> ATC Associates Inc. <br /> CI <br /> Drew Van AllenrSlo�t�'Ql <br /> Staff Scientist <br /> - EANF� <br /> c,~ rr•�,sr �,� v� <br /> !/ �Ltj r^ <br /> ! r'13"l.�r S <br /> rri <br /> Jeanne Homsey, P.E. Exp' - <br /> CA Registered Civil Engineer No. 47410 I; I <br /> cc: Dr. A.R. Glover <br /> of C phi� <br /> Mark List, RWQCB <br /> Attachments: Table 1, Summary of Groundwater Monitoring Data <br /> Table 2, Summary of Analytical Results-Groundwater <br /> Figure 1, Site Vicinity Map <br /> Figure 2, Groundwater Gradient Map <br /> Appendix A, Groundwater Well Purge and Sample Logs <br /> Appendix B, Laboratory Analytical Results <br /> / w:1178611repor1sl4gmr1998.doc 3 <br />