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Ms. Amy Terrell <br /> 31 October 2008 <br /> ' Page 6 <br /> ' SUMMARY OF REMEDIAL ACTIVITIES <br /> ' Summary of Initial 2002 Field-Scale Pilot Test <br /> In June 2002, Hydrogen Release Compound (HRC®) was injected into the first-encountered <br /> groundwater zone at 28 locations in a test plot upgradient of and adjacent to MW-2. The HRC® <br /> was injected as part of a field-scale pilot test to evaluate the efficacy of HRC® in degrading <br /> chlorinated hydrocarbons (i.e. pesticides) and TON in groundwater at the Site. <br /> ' Summary of 2007 Expanded Pilot Test <br /> Five years after beginning the Initial Remediation Pilot Study, Geosyntec recommended <br /> 1 expanding the pilot test to include additional injections and to use a more viscous, slow-release <br /> formulation (HRC-X®) of the HRC® utilized in the Initial Remediation Pilot Study. Geosyntec <br /> subsequently submitted a Work Plan to the RWQCB on 20 August 2007, which included details <br /> ' of the Expanded Pilot Test'. <br /> Two test plots were included in the Expanded Pilot Test, one located at the northern portion of <br /> ' the Site and one east of the Site near Welty Road (Figure 2). Each pilot test plot consisted of two <br /> rows, spaced approximately 8 to 10 feet apart, with 21 injections of HRC-X° per row emplaced <br /> between approximately 24 to 48 feet below ground surface. Prior to the injections, two new <br /> monitoring wells were installed in August 2007 to monitor the performance of the Expanded <br /> Pilot Test: (1) MW-6R, which is located within the center of the on-site test plot and (2) MW-7, <br /> which is located approximately 100 feet downgradient of the on-site test plot. The injections <br /> were conducted in October and November 2007. Details regarding implementation of the <br /> Expanded Pilot Test were submitted in an Implementation Report to the RWQCB on 30 January <br /> ' 20082. <br /> ' t Geosyntec Consultants. 2007. Work Plan For Modifying Existing In-Situ Pilot Test. 20 August. <br /> z Geosyntec Consultants. 2008. Expanded Pilot Test Implementation Report. 30 January. <br /> ' P:\PRJ2003REM\WFS\VER\VERG\3Q08\Report Text\3Q08 Report WFS-VER.doc <br /> engineers I scientists I innovators <br />