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k <br /> r <br /> Geologk,dTa nics inc. Page 3 <br /> Groundwater Monitoring Report <br /> Project No. 723.2 <br /> April 20,2001 <br /> sample, :.was placed in a 55-gallon DOT (Department of Transportation 17-H) approved <br /> container that is properly labeled and temporally stored on-site. <br /> The dedicated Waterra pump was used to collect each monitoring well sample. A stainless <br /> steel bailer was used to sample the domestic well at 60 E. Castle Avenue. <br /> Extreme care was exercised while transferring the sample into 40-mi VOA vials preserved <br /> with hydrochloric acid. All samples were checked for headspace bubbles, labeled, inserted <br /> into foam holders and placed in an ice chest cooled to 4°C for transport to the laboratory. <br /> The sampling technician wore disposable gloves while collecting all samples. <br /> A 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 /> The groundwater samples collected on December 2000 were delivered to Sherwood Labs of <br /> Hilmar; California(certification##1400) for analysis of. <br /> LO • Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX) by method EPA method 602 <br /> • TotaI Petroleum Hydrocarbons as Gasoline (TPH-G)by EPA method 5030/8015(M) <br /> Samples from each well were also sent to CLS Labs (certification #1233) from Sherwood <br /> Labs for the analysis of: <br /> • Oxygenated Fuel Compounds (OFCs; MTBE, DIPE, ETBE, TAME & TBA) by EPA <br /> method 8260B <br /> The detection limits for the above analyses are listed in Table 2 of Appendix A, while the <br /> lab analytical results are presented in Appendix B. <br /> 2.0 FINDINGS AND DISCUSSION <br /> The results of the groundwater sample analysis show the following: <br /> g <br /> • The concentration of BTEX and TPH-G continue to fluctuate in individual monitoring <br /> wells from one sampling event to the next. However, the overall trend seems to be <br /> stable. <br /> • MW7101 showed low levels of BTEX and TPH-G for the .sixth consecutive event. <br /> Concentrations appear to have stablized. <br /> • Gasoline oxygenates were not detected in any.well above the laboratory reporting limits. <br /> a <br />