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4 <br /> U <br /> estimated mass of diesel in place in the soil above the groundwater table to be 410 kg. <br /> Based on the monitor well soil data JJW infers that there is probable diesel contamination <br /> absorbed to the soil below the current groundwater table.'' However, there is currently not <br /> enough data to calculate the mass. <br /> The above mass balance quantities reflect approximate location and time-dependent <br /> contaminant quantities. They are best used empirically' to make general assessments <br /> regarding contaminant diffusion and degradation, and should not be construed as <br /> defining actual mass quantities. These calculations were,done in very general terms and <br /> were based on limited data. Mass balance values currently generated for this workplan <br /> are not as relevant as future values will be after the remediation process has finished and <br /> the site considered for closure at a future date. The ozone injection system is expected <br /> to eliminate nearly 100% of the hydrocarbon contamination in the soil and groundwater. <br /> 6.0 Monitor Well MW-3 Abandonment <br /> JJW Geosciences has noted in previous quarterly groundwater monitoring reports that <br /> f the upgradient monitor well MW-3, on the north side, of Jackson Street, has been <br /> Er damaged beyond repair by construction activities. San Joaquin County Environmental <br /> Health Department (SJCIEHD), in a letter dated October 31;°2002; requested that a work plan <br /> for the proper destruction of the well be submitted. <br /> Upon approval of this well abandonment workplan and preapproval from the state fund, <br /> JJW Geosciences will begin securing the required,' permits. Appropriate permit <br /> i applications and fees will be forwarded to SJCIEHD. JJW will obtain a utility clearance <br /> through USA. SJCIEHD will be notified at least 24 hoursIn advance of the proposed well <br /> destruction and a grout inspection will be scheduled with SJCIEHD. <br /> Monitor well MW-3 will be overdrilled to approximately 45 feet, the depth of the well. <br /> l <br /> Upon confirmation of casing extraction, the borehole will be tremie grouted to within a foot <br /> of the ground surface with cement grout as per SJC/EHD requirements. Following the <br /> grouting, the upper one foot of the borehole will be matched to surrounding surface <br /> conditions. Drilling cuttings will be drummed and stored.on-site to await characterization <br /> and disposal. <br /> t <br /> a <br /> C <br /> C <br /> 5 JJW GEOSCIENCES Inc. <br />