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! Ms. Amy Terrell <br /> 31 October 2008 <br /> ' Page 4 <br /> ' o Ammonia, detected at a concentration of 170 mg/L during the current monitoring <br /> event, has increased in concentration since 2007 but has still remained within <br /> ' historical ranges. <br /> o 1,2-dibromo-3-chloropropane (DBCP), 1,2-dibromoethane (EDB), and 1,2,3- <br /> ' trichloropropane (1,2,3-TCP) concentrations have generally decreased following <br /> the Initial Remediation Pilot Study in 2002. Both DBCP and EDB have decreased <br /> to non-detect levels since August 2004. 1,2,3-TCP was detected at a <br /> ' concentration 0.69 micrograms per liter ([g/L) during this monitoring event. <br /> o Diuron was detected at a concentration of 15 ltg/L, which is similar to the <br /> concentration measured in August 2007. Diuron concentrations have decreased <br /> significantly since the Initial Remediation Pilot Study was implemented. <br /> ' o 1,2-Dichloropropane (1,2-DCP), was detected at a concentration of 8.6 µg/l_ <br /> during this monitoring event. Since the Initial Remediation Pilot Study was <br /> initiated in 2002, 1,2-DCP concentrations have shown a generally decreasing <br /> ' trend (Figure 6). Prior to 2002 1,2-DCP concentrations had significant seasonal <br /> fluctuations. Since 2002 similar seasonal variation in 1,2-DCP concentrations <br /> have not been observed. <br /> o The only other volatile organic compound (VOC) detected was chlorobenzene, at <br /> ' a concentration of 1.3 µg/L. <br /> • MW-6R is the intergrid monitoring wells for the Expanded Pilot Test and the current <br /> monitoring event is the second time the well has been sampled. MW-6R had the highest <br /> ' concentrations of ammonia, EDB, DBCP, 1,2,3-TCP, chlorobenzene, and 1,2-DCP <br /> concentrations detected during the August 2008 monitoring event. Historical results for <br /> ' these COCs are presented in Figure 8. <br /> o Ammonia, tested for the first time, was detected at a concentration of 680 mg/L. <br /> o DBCP, EDB, 1,2,3-TCP, and diuron were the pesticides detected. <br /> o The only VOCs detected were chlorobenzene and 1,2-DCP. The 1,2-DCP <br /> ' concentration of 110 mg/L is the highest concentration detected. <br /> • MW-7, located immediately downgradient of MW-6R, had lower COC concentrations <br /> ' than MW-6R, with the exception of TON. Historical results for these CDCs are <br /> ' P:\PRJ2003REM\WFS\VER\VERG\3Q08\Report Text\3Q08 Report WFS-VER.doc <br /> engineers I scientists I innovators <br />