CORRESPONDENCE_2003-2004 - Laserfiche WebLink

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FURTHER ACTION At this time the deep probe of monitoringwell G -3 remains above the regulatory limit. It is expected that this probe will be brought within regulatory limits by the LFG system in place at this time. This expectation is based on: • This system had previously brought all perimeter migration monitoring wells within regulatory limits • All components of the LFG system operate properly at this time The LFG collection system has significant excess capacity However, if GW-3 remains above the regulatory limit, it will likely be due to lack of influence on the refuse in the vicinity of that monitoring well by the LFG system(Figure 2). To correct this situation, the County proposes to install a two-stage extraction well in the northeast corner of the Secondary Site(Figure 4). The first stage of this well will collect LFG from the refuse while the second stage will collect gas from the soil beneath the landfill (Figure 5). Each stage will be provided with an adjustment valve to adjust collection, and sampling ports to measure the quality of the methane. This new well will be connected to the existing LFG system through an above-ground pipe. Although the methane content of the gas collected from the lower stage is expected to be low, it is also expected that the quantity of gas collected at that stage will be minor compared to that collected by the rest of the LFG system; therefore, it is not expected that collecting soil gas in this manner will noticeably affect the operation of the LFG flare station. The County intends to proceed directly with the installation of this well,with installation planned for early February, weather permitting. Remediation Plan for LFG Migration 7 San Joaquin County Public Works/Solid Waste Harney Lane Sanitary Landfill Revised December 14,2004