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' - --- -- -----` eoto uaL?ecFraius Inc- - --- - -- - - - -- - - -- _ - --- - - - - -'Page 4� <br /> Gioundwater Monitoring Report <br /> Project No 425 2 <br /> January 12,2001 <br />' vials preserved with hydrochloric acid using a bottom-emptying device that minimizes <br /> sample aeration during transfer of the sample All samples were checked for headspace <br /> 1 bubbles, labeled, inserted into foam holders and placed in an ice chest cooled to 4°C for <br /> transport to the laboratory <br />' The sampling technician wore disposable gloves while collecting all samples <br /> A chain of custody document, listing all samples collected and their intended analyses, <br />' accompanied the samples from field to the laboratory, thereby providing a means to track <br /> their movement and insure their integrity <br /> During the December 22, 1999 event, Carol Oz of SJC PHS/EHD decided it was no longer <br /> necessary to sample the domestic well located at 1600"B" Durham Ferry Road, as this well <br /> was non-detect during the September 1999 sampling <br /> 1 <br /> 1.3 Laboratory Analyses <br />' The groundwater samples collected on September 20, 2000 were delivered to Sherwood <br /> Labs (Department of Health Services Certification No 1400), of Hilmar, California, for <br /> analysis <br /> The samples were analyzed using the following methods <br />' o EPA method 602-- BTEX <br /> C EPA method 602 — MTBE <br />' e EPA method 5030/8015(m) - TPH-Gasoline <br /> The detection limits for the above analyses are listed in Table 4 of Appendix A and the lab <br />' data is presented in Appendix B <br />' 2.0 FINDINGS AND DISCUSSION <br />' The laboratory analytical data from the September 20, 2000 monitoring event shows that <br /> TPH-G & BTEX compounds have been detected in the following monitoring wells MW-1, <br /> MW-2, MW-4, MW-5, MW-102, and MW-202 <br /> The results from the latest rounds of sampling are comparable with the results from the <br /> previous monitoring events The following observations are made <br />' • TPH-G concentrations in MW-1 exhibited a decreasing trend since the last event See <br /> Figure 4 for graph of Benzene and TPH-G versus time in MW-I <br /> 1 <br />