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ANNUAL SUMMARY <br /> MONITORING <br /> Groundwater <br /> SB-1 (Up-gradient): A review of 2003 data reveals that the concentration of one constituent, <br /> Electrical Conductivity, exceeded the intrawell tolerance limit. This occurred in the first quarter. A <br /> statistically significant trend, decreasing pH,was indicated for the third quarter. <br /> Trace concentrations of three VOCs were reported in the first quarter. Two of these were also found <br /> in quality control blanks and are "false positives". Three traces of VOCs were reported in the third <br /> quarter. Two were "false positives". None were reported in the second and fourth quarters. VOC <br /> detections from this up-gradient well have been sporadic and inconsistent. <br /> MW-4: All constituents were within the intrawell tolerance limits where the concentration limits <br /> could be established. There are statistically significant trends in the concentrations of pH <br /> (decreasing),Nitate-N (increasing), and Total Alkalinity as CaCO3 (increasing). The pH and <br /> Nitrate-N trends are consistent with the year 2002 results. <br /> No VOCs were reported in samples from well W-4 this year, other than "false positives". <br /> MW-5: Monitoring well MW-5 is designated an impacted well. Analysis indicates increasing <br /> trends in Chloride, TDS, Sulfate, Electrical Conductivity,Bicarbonate Alkalinity and Total <br /> Alkalinity. There was a decreasing trend in pH. <br /> Disregarding VOC detections that were also in quality control blanks, or"false positives",the total <br /> number of VOCs reported in 2003 is 24,which is less than the 29 reported for in 2002 in MW-5. <br /> Trend analysis indicated increasing trends in Tetrachloroethene,Trichlorofluoromethane, <br /> ' Trichloroethene and Vinyl Chloride, and decreasing trends in Acetone,Dichlorodifluoromethane and <br /> Methylene Chloride. <br /> MW-6: This new well(installed in July 2003)was sampled in the third and fourth quarters. All <br /> monitoring parameters are within expected ranges, except for pH which is atypically high. Because <br /> of the high pH,the well will be double-purged prior to sampling and the pH level will be monitored <br /> closely to see if it trends to an expected range. <br /> One VOC was reported in the fourth quarter,which is less than the three VOCs(one of which was a <br /> "false positive")reported the previous quarter. <br /> MW-7 (Uv-gradient): This new well was also installed in July 2003 and was sampled in the third <br /> and fourth quarters. All monitoring parameters are within expected ranges. The well will be <br /> monitored on a quarterly basis. <br /> Corral Hollow Landfill $ Department of Public Works/Solid Waste <br /> e Qtr/Annual 2003 Groundwater Monitoring County of San Joaquin-January 28,2004 <br />