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Cieologita!rec&da w Page 4 Groundwater Momtonng Report Project No 425 2 November 12,2001 ' actual aquifer conditions, were entering the well Groundwater parameter stabilization was characterized by three successive readings within 10% ' Before a sample was collected, the well's water level was allowed to recharge to at least 80% of its initial level All water removed from the monitoring wells and not used as a sample, was placed in a 55 gallon DOT (Department of Transportation 17-H) approved container that is properly labeled and temporarily stored on-site A stainless steel bailer was used to collect each sample Extreme care was exercised while collecting samples to prevent agitation of the water contained in the bailer Water samples were transferred from the bailer into 40-m1 VOA vials preserved with hydrochloric acid using a bottom-emptying device that minimizes sample aeration during transfer of the sample All samples were checked for headspace bubbles, labeled, inserted into foam holders and placed in an ice chest cooled to 4°C for transport to the laboratory The sampling technician wore disposable gloves while collecting all samples ' A chain of custody document, listing all samples collected and their intended analyses, accompanied the samples from field to the laboratory, thereby providing a means to track their movement and insure their integrity During the December 22, 1999 event, Carol Oz of SJC PHS/EHD decided it was no longer ' necessary to sample the domestic well located at 1600 "B" Durham Ferry Road, as this well was non-detect during the September 1999 sampling 1.3 Laboratory Analyses ' The groundwater samples collected on September 7, 2001 were delivered to Sherwood Labs (Department of Health Services Certification No 1400), of Hilmar, California, for analysis ' The samples were analyzed using the following methods • EPA method 8020/8015 —BTEX, MTBE ' • EPA method 5030/8015(m) - TPH-Gasoline The detection limits for the above analyses are listed in Table 4 of Appendix A and the ' laboratory data is presented in Appendix B r