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yi Ms. Mary Meays Page 3 <br /> January 9; 1998 <br /> 4� <br /> parameter measurements are presented in Tables 3 and 4 for the Former Tank Sites #1 <br /> and 42, respectively. These results are summarized below for each site. <br /> Former Tank Site#1 <br /> TPH and BTEX Results. TPH and BTEX detections in ground water samples collected <br /> from the Former Tank Site #1 during the September 1997 monitoring event are <br /> comparable to those associated with historical sampling events. TPH(g)was only <br /> detected in the MW-5 sample;this detection was relatively low(0.33 mg/l) and represents <br /> the lowest detection recorded for samples historically collected from this well during the <br /> quarterly monitoring program (Table 1). TPH(d)was not detected in any of the wells. <br /> BTEX compounds were generally not detected during this monitoring event. The one <br /> exception,benzene, was detected in the MW-5 sample; this detection(0.094 mg/l) also <br /> represents the lowest historical benzene detection of any of the samples collected from <br /> this well during the quarterly monitoring program (Table 1). Historical trend analysis <br /> indicates that TPH and BTEX concentrations have decreased significantly over time. <br /> F <br /> General Water Ouality Results. As presented in Table 3, the general water quality <br /> parameter measurements do not exhibit notable trends at this time, as evidenced by <br /> comparison of post-ORC to baseline (10196) conditions. The increase in heterotrophic <br /> plate count in the samples collected from MW-4 and MW-5 indicates that the presence of <br /> the ORC socks appears to be enhancing microbial activity. <br /> f <br /> Former Tank Site#2 <br /> TPH and BTEX Results. TPH and BTEX detections in ground water samples collected <br /> from the Former Tank Site #2 during the September 1997 monitoring event are also <br /> comparable to those associated with historical sampling events. TPH(g) was only <br /> detected in the MW-lA and MW-2A samples; the highest detection(1.1 mg/l)was <br /> associated with MW-IA. TPH(d)was not detected in any of the wells. BTEX <br /> compounds were only detected in the MW-IA and-2A samples. Historical trend analysis <br /> indicates that TPH and BTEX concentrations have decreased significantly over time. <br /> General Water Oualily Results. As presented in Table 4, the general water quality <br /> parameter measurements do not exhibit notable trends at this time,as evidenced by <br /> comparison of post-ORC to baseline (10196)conditions. The increase in heterotrophic <br /> plate count in the samples collected from MW-1A and MW-2A indicates that the <br /> presence of the ORC socks appears to be enhancing microbial activity. <br /> 3 <br /> Fill <br />