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GealoglcalTec6c►ticsljtc. Page 5 <br /> Groundwater Monitoring Report <br /> Project No.425.2 <br /> February 22,2005 <br /> 1 <br /> The lab results for the above analysis are summarized in Table 8 of Appendix A, and the <br /> ' laboratory data are presented in Appendix B. <br /> As required under AB2886, the laboratory data were submitted electronically to GeoTracker <br /> ' on November 19, 2004 - confirmation numbers are 2869401514 and 4865997135. <br /> 2.0 RESULTS OF INVESTIGATIONS <br /> Table 8 of Appendix A is a summary of analytical groundwater data. Groundwater analytical <br /> ' results and field observations are discussed below. <br /> • MW-2X, MW-6, MW-7, MW-101, MW-102, MW-105, MW-106, MW-107, MW- <br /> 201, MW-202, and all sampled domestic wells were non-detect above laboratory <br /> reporting limits for all analyzed constituents. <br /> • Low concentrations of Toluene (0.8 µg/L) and Total Xylenes (0.9 µg/L) were detected <br /> tin MW-3 (first time since May 1995) during November 2004 monitoring event. This <br /> may be due to a sampling error. Next monitoring event will clarify it. <br /> MW-1, MW-4, MW-5, and MW-8 showed low to moderate (1 to 2 digits) levels of <br /> BTEX constituents. <br /> • MW-1, MW-4, MW-5, and MW-8 showed moderate to high (2 to 4 digits) levels of <br /> TPH-G constituents. <br /> • MW-201 shows low concentrations of Toluene (0.5 µg/L) and Total Xylenes (1.0 <br /> t1g/L). <br /> • MW-2 continues to show high concentrations of TPH-G, and BTEX constituents <br /> during this monitoring event and also in the historical data. <br /> • The monitoring wells: MW-2X (well screen 32.5-35 ft bgs), and MW-102 (well <br /> ' screen 45.0-47.5 ft bgs) do not show any contamination. This indicates that <br /> contamination did not move to the deeper zones of water aquifer near MW-2 (the <br /> place of highest contamination). <br /> ' • During the last three monitoring events, MW-8 shows contamination from TPH-G <br /> and BTEX constituents. This may indicate the plume has moved in a northeasterly <br /> direction and has impacted MW-8. Concentrations in MW-8 are dramatically lower <br /> ' for the 4th quarter monitoring event than they were during the.April 2004 monitoring <br /> event. <br /> 1 <br /> 1 <br />