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CAMBRIA <br /> vicinity of well MW-2 The hydraulic gradient ranges from approximately 0 004 to <br /> 0 045 <br /> • Groundwater samples collected from wells MW-2, MW-4, MW-7, and MW-9 <br /> contained TPHg concentrations ranging from 85 1 to 8,180 ppb and benzene <br /> concentrations ranging from 0 671 to 246 ppb Wells MW-3, MW-4, and MW-7 <br /> through MW-9 contained MTBE concentrations ranging from 8 74 to 244 ppb <br /> TPHg, benzene, and MTBE were not detected in the remaining wells A chemical <br /> concentration map is presented on Figure 2 <br /> Quarterly Sampling <br /> Groundwater samples were analyzed for total purgeable hydrocarbons as gasoline (TPHg) by <br /> EPA Method 8015 (Modified) and benzene, toluene, ethylbenzene, xylenes (BTEX) and <br /> methyl tertiary butyl ether (MTBE) by EPA Method 8020 <br /> Chemical analytical data are presented in a summary table in Blaine's groundwater <br />. monitoring report (Appendix A) Additional historical analytical data are summarized in <br /> Table 1 <br /> Conclusions and Recommendations <br /> Hydrocarbon and MTBE concentrations are within the historical norm for this site Cambria <br /> completed additional site investigation fieldwork in March 2000 We will prepare a report <br /> documenting the findings of this investigation when we receive the laboratory chemical <br /> analytical data <br /> Quarterly monitoring, sampling, and reporting will continue on the established schedule <br /> • <br /> 0778 2 <br />