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MONITORING AND REPORTING PROGRAM NO. R5-2010-0016 -7- <br />SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS <br />NORTH COUNTY LANDFILL <br />SAN JOAQUIN COUNTY <br /> <br /> <br /> <br />E. UNSATURATED ZONE MONITORING <br />1. Soil Gas <br />The Discharger shall monitor soil gas for LFG to assess its ongoing potential as <br />source of impacts to groundwater. Field meters shall be calibrated for each <br />parameter before use. Field and calibration logs for each monitoring event shall <br />be included in each monitoring report. <br />a. Major Gases <br />Major gases (i.e., methane and carbon dioxide) shall be monitored at all <br />perimeter migration monitoring wells in accordance with the perimeter <br />migration monitoring requirements of the LEA. Major gases shall also be <br />monitored at the VOC monitoring points specified in Section E.1.b below. The <br />monitoring parameters and schedule shall be as follows: <br />Table E.1.a <br />Parameter Units Frequency Method <br />Ambient Temperature1 oC, oF Quarterly Meter <br />Gas Pressure1 psig Quarterly Meter <br />Methane2 % Quarterly Meter <br />Carbon Dioxide2 % Quarterly Meter <br />1. Measured prior to monitoring <br />2. Measured at each well. <br /> <br />b. VOCs <br />VOCs shall be monitored at soil gas wells SG-1 (deep probe), SG-3 (deep <br />probe) and SG-6. VOCs shall also be monitored in any perimeter migration <br />monitoring well in which the methane concentration exceeds 5% by volume. <br />The monitoring parameters and schedule shall be as follows: <br /> <br />Table E.1.b <br />Parameter Units Frequency Method <br />Major Gases Same as Table E.1.a. <br />VOCs1 ppbv Semiannually EPA Method TO-15 or <br />8260B <br />1. If more than one probe in perimeter well exceeds 5% methane, only the lower of the <br />probes need be monitored for VOCs. <br /> <br />2. Pore liquid Monitoring <br />The Discharger shall monitor soil pore liquid as follows: <br />