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CAMBRIA <br /> at a concentration of 6,410 ppb, however the sample was analyzed outside of EPA <br /> recommended hold time A chemical 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 Groundwater from well MW-3 <br /> was also analyzed for MTBE by EPA Method 8260A <br /> Chemical analytical data are presented in a summary table in Blaine's groundwater <br /> monitoring report (Appendix A) <br /> Conclusions and Recommendations <br /> Petroleum hydrocarbon concentrations in the wells this quarter are generally consistent with <br /> previous quarter's data This quarter's EPA Method 8260 MTBE data (from well MW-3) <br /> • compares well with the EPA Method 8260 MTBE data from the fourth quarter 1999 <br /> Groundwater flow direction this quarter is in the same direction it was during the first quarter <br /> 2000 However, groundwater flow direction during the fourth quarter 1999 was in the <br /> opposite direction The groundwater gradient has been very flat at this site which can cause <br /> fluctuations in flow direction Continued quarterly monitoring and sampling is recommended <br /> to determine the predominant groundwater flow direction beneath this site <br /> Closing <br /> Cambria prepared a Site Investigation Work Plan for this site and issued it to SJCPHS on July <br /> 3, 2000 We are prepared to implement this work plan once we receive wi itten approval <br /> from SJCPHS <br /> 0955 2 <br />