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MW-6A. Since chloroform is also a constituent used to treat drinking water and has been rarely <br /> detected in on-site wells, and given the fact that background well MW-6A is located <br /> approximately 1200 feet from the landfill and was completed in a traffic box in a residential <br /> street, the detection of chloroform in background well MW-6A is not believed to the result of a <br /> release from the landfill. <br /> The results of water quality analyses completed for surface-water monitoring stations are <br /> generally consistent with previous results. During the current monitoring period, one volatile <br /> organic compound (VOC) (carbon disulfide)was measured above the PQL in the sample <br /> collected from station SW-1. In response to the detection of chloroform in station SW-1, retest <br /> samples were collected on June 30, 2009. The results of the retest samples indicate that no <br /> VOCs were detected and the carbon disulfide concentration measured in the primary sample is <br /> concluded to be a false positive. With the exception of turbidity in all three surface-water <br /> samples, no statistically significant increasing trends were noted. Since turbidity exhibits a <br /> statistically significant increasing trend at background surface water stations SW-1 and SW-2, <br /> the increasing trend in turbidity at SW-3 is unlikely to be indicative of an impact from the <br /> facility. <br /> The field screening results from soil-pore gas monitoring probes indicates that no methane was <br /> measured in soil-pore gas monitoring probes during the monitoring period. <br /> If you have any questions regarding this report, please call me at (858) 451-1136. <br /> Sincerely, <br /> 4 �. <br /> William B. L p z, PG, CHg <br /> Project Geologist <br /> Attachment <br /> C:12009-0018WcsumItr_1SA09.doc <br /> -2—— <br /> GeoLogic Associates <br />