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Corral Hollow LFG System Audit and Upgrade Report multi-depth probes are used for 27 CCR perimeter compliance monitoring ( Figure 2) We ' understand that CalRecycle and its Local Enforcement Agency (LEA, the County of San Joaquin Environmental Health Department), have approved the monitoring well network as being in compliance with 27 CCR requirements. The site is presently in compliance with regulations applicable to subsurface LFG migration (refer to Appendix A Table 3). ' Subsurface Combustible Gas Monitoring Procedures ' LFG monitoring wells are tested on a quarterly basis by the County. Concentrations of methane, carbon dioxide, and oxygen are recorded as well as subsurface pressure readings. Weather conditions including temperature, barometric pressure, and general conditions are also recording during sampling events. Samples are collected from one probe at each well to measure the ' concentration of VOCs in accordance with the Site WDRs. ' On-Site Structure Monitoring Onsite structures are not enclosed and do not require explosive gas monitoring. Structures include a blower flare station, condensate storage tank,perimeter walls, and fences. ' CCR Title 27 Reporting ' Results of the probe sampling are reported on a quarterly basis in the Quarterly Report of Regulatory Compliance submitted to the LEA. Results of historic monitoring over the period 2011 through second quarter 2013 show methane levels at all probes are consistently at or near ' non-detect and the Site is in compliance with 27 CCR standards for public safety. SOURCE CONTROL EVALUATION Operations Review t SCS performed field inspection, monitoring and testing of all elements of the GCCS at CHLF. The objectives were to assess the overall functionally of various LFG extraction and monitoring system components, and to assess the effectiveness of the existing LFG system and the newly- installed LFG extraction wells in terms of the system's ability to capture LFG, provide wide- source control, and to prevent any additional LFG from migrating into the vadose zone or groundwater. Specifically, SCS's scope of work for the operations review included: ' • Perform total depth, liquid level monitoring and video camera recording of the interior of the casings at existing LFG extraction wells into which a camera could be inserted, ' including the newly-installed wells. The inspection included video recording of the well casings to determine if there were any blockage, pinched well casings, or other obstructions that would prevent adequate extraction from any extraction point. The inspection verified the integrity of each well and determined that perforated zones are not restricted due to possible elevated liquid levels. 7 December 2013