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Amok <br />W 9 <br />The Corral Hollow Sanitary Landfill (CHSL) is owned and operated <br />by San Joaquin County. The site is located on Corral Hollow Road <br />in southern San Joaquin County near Tracy (Figure 1). The CHSL <br />is approximately 45 acres. <br />The Landfill currently operates under Waste Discharge Requirement <br />Number 89-046 from the Regional Water Quality Control Board <br />(RWQCB) and Solid Waste Facilities Permit Number 39 -AA -0005, <br />issued by the California Integrated Waste Management Board <br />(CIWMB). <br />In accordance with the regulations, the County will monitor the <br />perimeter of the site for migration of landfill gas. Figure 2 <br />shows the property boundary. The County proposes to drill seven <br />21 deep gas monitoring borings around the perimeter of the site. <br />The borings will be installed using a slide hammer. <br />The County will mark the location of each boring and test for <br />landfill gas quarterly. The equipment used will be a Gas Tech <br />Landfill Monitor equipped with parts per million (ppm), Lower <br />Explosive Limit (5%), and 100% gas scales. The 5% scale will be <br />used. The instrument will be calibrated with a 2.5% methane <br />mixture and will be warmed up for approximately 10 minutes prior <br />to monitoring. The probe will be inserted to the full depth of <br />the boring for approximately 2 minutes. <br />