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Working to Restore Nature <br /> Groundwater Sampling <br /> Groundwater samples were collected from on-site momtoring wells MW-1 through MW-3 <br /> in accordance with RESNA's groundwater sampling protocol (Appendix A) Groundwater <br /> purged from the wells and equipment decontamination water was placed in a licensed, <br /> trailer-mounted container and disposed of at Gibson Environmental, a licensed recycling <br /> L facility located in Redwood City, California The volume of groundwater removed from <br /> each well is noted on the well purge data sheets included in Appendix B <br />' Laboratory Analyses <br /> The groundwater samples were transported to Sequoia Analytical Laboratories, a state- <br /> certified laboratory located in Redwood City, California Samples were analyzed for the <br /> presence of TPHd following modified Environmental Protection Agency (EPA) Methods <br /> 3510/3520/8015, TPHg following EPA Methods 5030/8015, and BTEX following EPA <br /> Methods 5030/8020 The laboratory analytical report and chain-of-custody record are <br /> attached in Appendix C <br /> Summary of Results <br /> A summary of the analytical results from current and past well samplings is presented <br /> Table 1 Plate 2 shows the groundwater elevation contours for June 21, 1994, based on the <br /> water level data in Table 1 Since December 17, 1993, the groundwater elevations rose an <br /> average of 3.15 feet, ranging from 3 13 feet in well MW-1 to 3 19 feet in well MW-3 The <br />' apparent groundwater flow direction for June 21, 1994, was easterly at a gradient of <br /> approximately 0 002 No petroleum hydrocarbons were detected in water samples from any <br /> well during this round of sampling As shown in Table 1, TPHd, TPHg and BTEX have not <br />' been detected in groundwater samples collected from the wells at this site since March 1991 <br /> The next semiannual groundwater sampling and analysis is scheduled for December 1994 <br />' Reporting Requirements <br /> RESNA recommends a copy of this report be forwarded by Quik Stop to the following <br />' agencies <br /> Ms Eleanor Ratliff <br /> Environmental Health Specialist <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> L445 North San Joaquin Street <br /> Stockton, California 95202-2026 <br /> F7120 94/1Q4 2 <br /> 1 <br />