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BOS/COB 209-498-3694 p. 4 <br /> C A M B R I A <br /> Field monitoring data and chemical analytical data are presented in a summary table in <br /> Blaine's groundwater monitoring report (Appendix A). Additional analytical data are <br /> summarized on Table 1. <br /> Conclusions and Recommendations <br /> The petroleum hydrocarbon and MTBE concentrations in groundwater samples collected <br /> from the shallow wells this quarter are within the historical norm for this site. Wells MW-5, <br /> © MW-8, and RW-IA continue to contain the highest levels of hydrocarbons and MTBE. <br /> However, analytical data from offsite wells suggests the hydrocarbons and MTBE detected <br /> onsite wells (MW-5, MW-8, and RW-IA) are remaining onsite. <br /> Groundwater samples from the CalTrans irrigation well and the private water wells did not <br /> contain TPHg, benzene, or fuel oxygenates this quarter. We will continue quarterly <br /> groundwater sampling and analysis to confirm the presence or absence of MTBE in these <br /> wells. <br /> We recommend methanol analysis be discontinued in the CalTrans well and the domestic <br /> wells as it has never been detected in these wells with the exception of one anomalous <br /> detection in the 2468 Country Club Boulevard well in August 1997. We also recommend <br /> monitoring the water level in the Smith Canal be discontinued as the existing data clearly <br /> suggests that water level in the canal is consistently higher than the groundwater level. These <br /> recommended changes will be implemented during the second quarter 2000 monitoring and <br /> sampling event unless we hear otherwise from SJCPHS. <br /> Cambria will continue to monitor groundwater analytical data from the monitoring wells at <br /> this site to determine if additional plume delineation is necessary. If additional investigative <br /> work is warranted in the future, we will make recommendations for this work. <br /> 0783 3 <br />