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Ms. Amy Terrell <br /> 20 August 2007 <br /> Page 3 <br /> microbial activity promote denitrification. Indigenous microorganisms capable of reductive <br /> dechlorination then use the hydrogen to progressively remove chlorine atoms from chlorinated <br /> hydrocarbon contaminants (e.g. convert 1,2-DCP to 1-chloropropane and 2-chloropropane to and <br /> eventually to propene). <br /> A copy of the Material Safety Data Sheet for the HRC-X®will be included in the updated Site <br /> Health and Safety Plan. <br /> SITE INSPECTION <br /> Geosyntec conducted a site walk on 20 June 2007 to inspect current Site conditions and spatial <br /> constraints associated with the proposed location of the pilot test plots and monitoring wells <br /> (Figure 2). No obstructions were found in the vicinity of the test plot area in the northern portion <br /> of the Site and sufficient area exists for both the injections as well as the performance monitoring <br /> wells. Geosyntec also inspected the proposed location for the test plot on Welty Road to verify <br /> that sufficient area for the injection grid was present within the road right-of way. <br /> FIELD METHODS <br /> The modified pilot test will consist of(1) installing, developing, and baseline sampling two new <br /> shallow monitoring wells (MW-6R, and MW-7); (2) destroying existing well MW-6 due to a <br /> damaged surface casing; (3) injecting HRC®-X at the two injection test plots (Figure 2); and (4) <br /> post-injection monitoring and reporting. The field work activities are summarized in the <br /> following sections. <br /> Permitting <br /> Geosyntec will obtain all required permits from the appropriate agencies prior to the onset of <br /> field activities. Permits are expected to include drilling, well destruction, and right-of-way <br /> encroachment permits. Geosyntec will also coordinate with the San Joaquin County Department <br /> of Environmental Health for inspection of grouting associated with well completion, well <br /> destruction, and HRC®-X injections. <br /> P:\PRJ2003REM\WFS\VER\VERF\2007 Expanded Pilot Work Plan\Expanded_Pilot Test WP.doc <br /> engineers I scientists I innovators <br />