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