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C4eolagtcal Tecknccs lnc Page 4 <br /> Groundwater Monitoring Report <br /> Project No 724 2 <br /> i May 15, 2003 <br /> Before a sample was collected, the water level was allowed to recharge to at least 80% of <br /> the initial level All purge water removed from the monitoring well was placed in a <br /> ' properly labeled 55-gallon DOT (Department of Transportation 17-H) approved container <br /> and is temporarily stored on-site <br /> ' A dedicated Wattera pump was used to collect each sample <br /> Water samples were transferred in a manner that minimizes sample aeration during transfer <br /> of the sample into 40-m1 VOA vials preserved with hydrochloric acid All samples were <br /> checked for headspace bubbles, labeled, inserted into foam holders and placed into an ice <br /> 1' chest cooled to 4°C for transport to the laboratory <br /> The sampling technician, while collecting all samples, wore disposable gloves <br /> tA 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 ensure their integrity <br /> 1.3 Laboratory Analyses <br /> Theroundwater samples collected on March 13 2003 were delivered to Sherwood g p Labs <br /> ' of Hilmar, California(certification #1400) for analyses of <br /> • Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX), MTBE by EPA method 8020 <br /> • Total Petroleum Hydrocarbons as Gasoline (TPH-G) by EPA method 8015(M) <br /> The detection limits for the above analyses are listed in Table 4 of Appendix A, while the <br /> lab analytical results are presented in Appendix B <br /> As required under AB2886, the groundwater elevation and laboratory data were submitted <br /> electronically to GeoTracker on March 25 and April 17, 2003 - confirmation numbers <br /> 2909629285 and 4164382755 <br />' 2.0 FINDINGS AND DISCUSSION <br />' The results of the groundwater sample analysis indicate the following <br /> 0 Wells MW-1, MW-5 and MW-6 did not contain petroleum hydrocarbon contaminants <br /> above the laboratory reporting limits <br />' • Deep well MW-104 remains free of detectable contamination <br /> • Wells MW-2, MW-3 and MW-4 have trace amounts to low concentrations of the BTEX <br /> and TPH-G <br /> 1 <br />