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URS <br /> Mr.Jeffrey Wong <br /> ` 3 San Joaquin Public Health Service <br /> - Third Quarter 2003 Groundwater Monitoring Report <br /> June 11,2004 <br /> Es Page 3 of 4 <br /> i' <br /> • blanks; <br /> + system monitoring compounds (surrogates); <br /> "`"� • laboratory control samples; <br /> ;_a • matrix spike/matrix spike duplicates; and <br /> • compound identification and quantification. <br /> >=� The results of the data validation are included in the Data Validation Summary (Appendix B). The data <br /> validation found all results to be acceptable and useable for their intended purpose with the no <br /> limitations. <br /> ='• GROUNDWATER ELEVATIONS AND GRADIENT <br /> A contour map of groundwater elevations is shown in Figure 3. Current and historical water level <br /> elevation data for all wells are included in Table 2. Water levels measured in the third Quarter of 2003 <br /> were 50 to 60 feet below ground surface, or approximately —36 feet with reference to mean sea level <br /> datum (MSLD). Although historical data indicate a rise in water levels subsequent to 1990, data <br /> collected since December 1999 suggest that this trend may have stabilized or reversed. The water level <br /> elevations measured in the third quarter of 2003 were the lowest measured since September 1996. <br /> �= Third quarter 2003 water Ievel data indicate a groundwater gradient of 0.0073 to the north. <br /> GROUNDWATER ANALYTICAL RESULTS <br /> A historical summary of analytical results for groundwater samples collected through September 2003 is <br /> included in Table 3. Results for tetrachloroethene (PCE) and 1,2-dichloroethatne (1,2-DCA) are also <br /> presented on Figure 4. <br /> TPH-diesel <br /> Total petroleum hydrocarbon (TPH reported as unknown hydrocarbon (LTH) due to lack of match with <br /> the TPH-diesel standard were reported for DMW-4 (200 micrograms per liter (gg/L)) and DMW-5 (94 <br /> n/W. <br /> Volatiles and Oxygenates by EPA Method 8260B <br /> 1,2-Dichloroethane was reported in samples collected from DMW-2 (5.9 µg/L, and DMW-5 (21 gg/L). <br /> These results are equal to or lower than previously reported results. Chloroform was reported in samples <br /> collected from DMW-1 (1.7 µg/L).No PCE or other volatile constituents were detected. <br /> c T� <br /> KAWprocess12273613Q03AFP_rev03 doe <br />