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MONITORING RESULTS Groundwater Well MW-2R was not available for sampling during the first semester monitoring period. Future ' monitoring will include analysis of samples from MW 2R, and will not include monitoring of water from abandoned well MW-2. ' Monitoring and Field Parameters A comparison of the monitoring parameters to concentration limits show that there were several ' slight exceedances this period(Table 1). However,most of these exceedances do not appear to be indications of a release from the landfill. ' The concentration of Nitrate in MW-2 exceeded its respective limit by less than one part per million, and was only 0.3 ppm higher than the concentration in MW-1. Therefore,we do not consider this a serious concern at this time. LThe concentration of Chloride in LW-1 exceeded its concentration limit by 0.4 ppm, and is therefore not a serious concern at this time. The County will monitor concentrations of Chloride closely to ensure groundwater quality is protected. VOCs Acetone was reported in groundwater collected from MW-1. However,Acetone was also reported in both the field and trip blanks and was therefore considered a false positive detection. This well was not resampled. No other VOCs were detected in any monitoring wells. Surface Water ' There was no water present during the first semester monitoring event. GROUNDWATER FLOW DIRECTION ' Groundwater levels were measured in monitoring wells MW-1,MW-2, and MW-3 during the first and second quarters of the calendar year. Groundwater was determined to flow towards the southwest (Figure 3). The groundwater gradient is 0.0015 foot per foot,calculated from the ' contours drawn. STANDARD OBSERVATIONS Foothill Sanitary Landfill 8 Department of Public Works/Solid Waste 1s`Semester 2003 Groundwater Monitoring Report County of San Joaquin-July 29,2003