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Ms. Amy Terrell <br /> 20 August 2007 <br /> Page 6 <br /> Investigation-Derived Waste <br /> Clean downhole equipment will be used at the two drilling locations. Soil cuttings, <br /> decontamination water, and purge water will be placed in labeled 55-gallon drums and <br /> temporarily stored on wooden pallets at the Site pending analysis. Once analytical results have <br /> been received, the drums will be appropriately disposed. <br /> Surveying <br /> Following installation of the monitoring wells, the north side of the top of well casing without <br /> the cap and ground surface elevations will be surveyed for both wells by a California-licensed <br /> Professional Land Surveyor. Additionally, the 4 corners of the test plots located at the northern <br /> portion of the Site and at Welty Road will be marked (e.g. feather, stakes) and surveyed. <br /> Injection locations at Welty Road will be confirmed by the surveyor to be in the road right-of- <br /> way and not overlapping any adjacent private property. Surveying data will be provided as an <br /> electronic deliverable containing both geodetic and local state plane coordinate system <br /> coordinates. <br /> Injections <br /> Two test plots are proposed, one near the previous pilot test location at the northern portion of <br /> the Site and one near MW-5 at Welty Road (Figure 2). Each test plot would consist of two rows <br /> spaced 10 feet apart and consisting of 21 injections of HRC-X®. Injections within each row will <br /> be spaced 5 feet apart. Injections will be advanced by a California-licensed driller using a <br /> Geoprobe® 6600 direct-push rig to depths ranging from 24 to 48 ft bgs with 4 pounds of HRC- <br /> X® injected per lineal foot. <br /> To reduce viscosity of the HRC-X® during injection, a hot tank will be used to heat the HRC-X® <br /> before injection. The HRC-X® will be pumped through Geoprobe rods using a grout pump <br /> capable of pumping at pressures ranging from 200 psi to 1,500 psi. A cement grout will be used <br /> to seal the injection points from the top of the HRC-X® injection depth up to ground surface. <br /> Injection instructions recommended by Regenesis are included as an attachment to this Work <br /> Plan. <br /> P:\PRJ2003REM\WFS\VER\VERF12007 Expanded Pilot Work Plan\Expanded_Pilot Test WP.doc <br /> engineers I scientists I innovators <br />