Laserfiche WebLink
' Ms. Amy Terrell <br /> 31 October 2008 <br /> ' Page 3 <br /> ' initial pilot study conducted in June 2002. A complete historical dataset is provided <br /> electronically as Attachment 3. <br /> ' The following discussion of analytical results is organized according to the position of the <br /> monitoring wells relative to the Site: upgradient (MW-4), on-Site (MW-2, MW-3, MW-6R, and <br /> ' MW-7) and downgradient of the Site (MW-5). <br /> ' Upgradient—MW-4 <br /> Well MW-4 is located upgradient of the Site and concentrations detected represent background <br /> conditions. <br /> • The total oxidizable nitrogen (TON) concentration of 23 mg/L is at the high end of the <br /> ' historical concentration range. <br /> • The ammonia concentration of 53 mg/L is higher than historical concentrations, which <br /> ' were typically less than 1 mg/L. <br /> • No other chemicals of concern (COC) were detected at MW-4. <br /> On-Site: MW-2,MW-6R,MW-7,and MW-3 <br /> ' Monitoring wells MW-2, MW-6R, MW-7, and MW-3 are located along the eastern boundary of <br /> the Site (Figure 2). MW-2 and MW-7 are located immediately downgradient of the Expanded <br /> ' Pilot Test area and MW-6R is located within the Expanded Pilot Test area. The results of the <br /> Expanded Pilot Test performance monitoring are discussed later in this report. <br /> • Historical groundwater elevations and COCs for well MW-2 are presented in Table 5 and <br /> plotted versus time on Figure 6. <br /> ' o TON decreased to less than the Drinking Water Maximum Contaminant Level <br /> (MCL) shortly after the pilot test began in 2002 and concentrations have remained <br /> there, with a slight increase to 7.3 mg/L for the current monitoring event. <br /> ' P:\PR12003REM\WFS\VER\VERG\3Q08\Report Text\3Q08 Report WFS-VER.doc <br /> engineers I scientists I innovators <br />