SU0006108 SSCRPT - Laserfiche WebLink

Home Browse Search

GEOSYNTEC CONsuLTANTs Ms. Amy Terrell 18 November 2004 Page 6 Nitrate as nitrogen in MW-2 has decreased by over 99% to less than the detection limit of 0.2 mg/L. Indicator metabolic acids have only previously been detected in MW-2 and were not detected in the four monitoring wells during the Yd quarter 2004 monitoring event. Methane is detected in MW-2, MW-5, and MW-6. The concentration of 1,2-DCP in MW-6 during the P quarter 2004 was 49.3 µg/L, which is the lowest concentration detected since monitoring in MW-6 began. In downgradient monitoring well MW-5, 1,2-DCP was detected for the first _ time at a concentration of 31.4 µg/L. As discussed above, 1,2-DCP was also detected in the "routine monitoring" sample at a concentration higher than all previous samples. This result may or may not be anomalous; we will evaluate this in the I"quarter 2005 sampling event. Status of Implementing Soil Remedial Action Plan On 25 August 2003, GeoSyntec submitted to the RWQCB a soil Remediation Action Plan (RAP), which summarized the soil data collected to date in the vicinity of the former tank farm, and proposed a plan to mitigate the fertilizer constituents in the soil in the vicinity of the former tank farm. Task 1 - Soil Collection was completed on 16 September 2003. Task 2 - Microcosm Construction was completed on 3 October 2003. Task 3 - Microcosm Study _ began on 6 October 2003 and the last set of soil samples were analyzed in May 2004. GeoSyntec transmitted the results of the study to the RWQCB on 30 June 2004. As stated in the microcosm report, it appears enhanced in-situ bioremediation would be effective in reducing the nitrate concentrations at the site, but not ammonium concentrations in soil. GeoSyntec and WFS are evaluating other options for the soil in the vicinity of the former tank farm. _ P:\PRJ2003REM\WFS\VERVNONF\3Q04%WC04066.dm