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' Geologaal reckaucs lac. Page 4 <br /> Groundwater Mowtonng Report <br /> Project No 770 2 <br /> August 27,2004 <br /> ' All non-disposable sampling equipment was decontaminated using a hot water washer and <br /> detergent before and between uses Disposable gloves were used by the technician to collect <br /> ' all samples and were changed with each sample collection <br /> A chain of custody document, listing all samples collected, accompanied the samples from <br /> ' field to laboratory, thereby providing a means to track their movement and insure their <br /> integrity <br /> 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 /> The groundwater samples collected on June 7, 2004, were delivered to Sherwood Lab <br /> ' (Department of Health Services Certification No 1400), of Hilmar, California, for analysis <br /> Sherwood analyzed the eleven 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 /> ® TEPH-Diesel and Motor Oil by EPA method 3500/8015(M) <br /> In addition, Sherwood forwarded samples to Castle Analytical Laboratory (Department of <br /> ' Health Services Certification No 2480) of Atwater, California, for analysis of <br /> • 1,2 DCA and EDB by EPA method 8260 per{ <br /> � vm9l,� <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 August 6 and 24, 2004 - confirmation numbers <br /> 3046008338 & 5027241349 <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 May <br /> 2003 sounding events is anomalous to the historical data The deeper aquifer has been <br /> monitored by three wells (MW-104, MW-105 and MW-106) since June 2002 and the <br />