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i from the landfill since background well MW-6A is located approximately 1200 feet cross- k gradient from the landfill,and chloroform has been rarely detected in on-site wells. The results of water quality analyses completed from the surface-water monitoring stations are C generally consistent with previous results. No volatile organic compounds were detected in the samples collected from the surface water stations during the monitoring period. A comparison of upgradient(SW-1 and SW-2)to downgradient(SW-3) surface water samples indicates generally similar inorganic constituent concentrations in the upgradient and downgradient surface water station, suggesting that the landfill is not impacting surface water quality. During the current monitoring period,no CL were exceeded,and with the exception of turbidity in all three surface- water samples,no statistically significant increasing trends were noted. Since turbidity exhibits a statistically significant increasing trend at background surface water stations SW-1 and SW-2, the increasing trend in turbidity at SW-3 is unlikely to be indicative of an impact from the facility. The results of the constituents of concern(COC)sampling conducted during the monitoring period indicates that excluding the metals,no COCl were detected in groundwater,leachate,and surface water samples. Several maximum contaminant level (MCL)exceedances were measured for arsenic,iron,and manganese in surface water and/or groundwater monitoring points. Given the fact that elevated arsenic,iron,and manganese concentrations were measured in background wells and upgradient surface water stations,the MCL exceedances do not appear to be related to a release from the landfill. Field screening results from soil-pore gas monitoring probes indicate that no methane was measured in soil-pore gas monitoring probes during the monitoring period,or over the past year. I certify under penalty of law,that I have personally examined and am familiar with the information submitted in this document and all attachments,and that based on my inquiry of those individuals immediately responsible for obtaining this information,I believe that the information is true,accurate,and complete. I am aware that there are significant penalties for submitting false information,including the possibility of fine and imprisonment. If you have any questions regarding this report,please call me at(209)982-4298. Sincerely, Don U Environmental Manager Attachment -C.%20 o IWcsumsu z&AWAm -2-