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1 <br /> Gea goal Teclinccs Inc Page S <br /> Groundwater Monitoring Report <br /> Project No 770 2 <br /> June 15,2004 <br /> 1 All water purged from each monitoring well and not used as a sample was placed in a <br /> properly labeled 55 gallon DOT approved container and stored on site until its proper <br /> disposition can be arranged <br /> Groundwater monitoring field logs are included in Appendix C <br />' 1.3 Laboratory Analyses <br /> ses <br /> The groundwater samples collected on March 15-16, 2004, were delivered to Sherwood Lab <br /> (Department of Health Services Certification No 1400), of Hilmar, California, for analysis <br /> Sherwood analyzed the seven monitoring well groundwater samples for <br /> • Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX)by EPA method 8020 - <br /> • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 5030/8015(M) - <br /> o TEPH-Diesel and Motor Oil by EPA method 3500/8015(M) <br />' The detection limits for the above analyses are listed in Table 3 of Appendix A while the <br /> laboratory analytical results are presented in Appendix B <br /> As required under AB2886, the laboratory analytical and groundwater elevation data were <br /> submitted electronically to GeoTracker on March 31 and May 4, 2004 - confirmation <br /> numbers 5624727547 & 4114552140 <br />' 2.0 FINDINGS AND DISCUSSION <br /> The results of the groundwater monitoring event indicate the following <br />' • The reversal of groundwater direction by 180° in the deeper aquifer for the April and <br /> May 2003 sounding events is anomalous to the historical data The deeper aquifer has <br /> been monitored by three wells (MW-104, MW-105 and MW-106) since June 2002 and <br />' the other events all displayed an easterly trend to groundwater direction It is noted that <br /> the gradients for these two_events were higher than normal suggesting_that off site <br /> production is influencing the aquifer A well receptor survey was completed for the site <br />' in January 2001 and two agricultural wells were identified approximately 1600 feet west <br /> of the site (see Map 1, Table 1 — Appendix D) If these wells were operated during the <br />' months in question, it is possible that the Marci site was within the cone of depression <br /> created by the well pumping The shallow aquifer did not reverse during this period and <br /> this may be due to the domestic wells to the southeast of the site that may be screened <br />' shallower than the agricultural wells and exert a primary influence on the water table <br /> that is easterly <br />