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UM <br /> ,G <br /> Mr. Jeffrey Wong <br /> San Joaquin Public Health Service <br /> Fourth Quarter 2003 Groundwater Monitoring Report <br /> June 11,2004 <br /> � Page 3 of 4 <br /> • system monitoring compounds(surrogates); <br /> �s <br /> • laboratory control samples; i6 <br /> a <br /> • matrix spike/matrix spike dupticates;�'and <br /> I <br /> • compound identification and quantification. <br /> 3 h <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: r <br /> GROUNDWATER ELEVATIONS AND GRADIENT <br /> I � <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 fourth quarter of 2003 <br /> were between 48 and 50 feet below ground surface, or approximately —32 feet with reference to mean <br /> sea Ievel datum(MSLD). Although historical data indicate a rise in water levels subsequent to 1990, data 1 <br /> } <br /> collected since December 1999 suggest that this trend may have stabilized or reversed. <br /> Fourth quarter 2003 water level data indicate a groundwater gradient of 0.011 to the west-northwest. <br /> GROUNDWATER ANALYTICAL RESULTS <br /> �II <br /> A historical summary of analytical resultsjfor groundwater samples collected through December 2003 is <br /> included in Table 3. Results for tetrachlo}}roethene (PCE) and 1,2-dichloroethatne (1,2-DCA) are also <br /> presented on Figure 4. <br /> TPH-diesel ;' <br /> E <br /> I 1 <br /> Total petroleum hydrocarbon (TPH), repoted as unknown hydrocarbon (UH) due to lack of match with j <br /> the TPH-diesel standard were reported for DMW-3 (200 micrograms per liter(RglL)). <br /> i� <br /> Volatiles and Oxygenates by EPA Method 8260B <br /> 1,2-Dichloroethane was reported in sampl IIs collected from DMW-5 (3.5 µg/L), and DMW-6 (18 µg/L). <br /> These results are equal to or lower than previously reported results. Chloroform was reported in samples <br /> collected from DMW-1 (2.1 gg/L) and DMW-5 (1.4 gg/L). No PCE or other volatile constituents were <br /> detected. <br /> I <br /> i K:1Wprocess12273614Q03AFP_revOl.doc <br /> it <br />