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MONITORING AND REPORTING PROGRAM ORDER NO. R5-2009-0049 -5- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS HARNEY LANE LANDFILL SAN JOAQUIN COUNTY Landfill Interval Location Sample Type Monitoring Points 1 Middle Perimeter Monitoring GW-9M, GW-10D 1 Deep In situ Extraction East header 2 Deep In situ Extraction East or west header The LFG monitoring points shall also include, for a given monitoring period, any perimeter gas well that exceeds 5 percent methane by volume during that period, as measured under the perimeter migration monitoring program required by the Local Enforcement Agency. 2. Monitoring Parameters & Schedule The LFG monitoring parameters shall be as follows: Parameter Units Frequency Method Gas Pressure In. w.c.' Quarterly Meter Methane % Quarterly Meter Carbon Dioxide % Quarterly Meter VOCs' ppbv Semiannually EPA Method TO-15 or 82606 1. Inches water column. 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. E. GROUNDWATER MONITORING 1. Elevation Monitoring (Section 2041 (e)(13)) The groundwater surface elevation (in feet and hundredths, MSL) in all wells and piezometers shall be measured on a quarterly basis. Groundwater elevations taken prior to purging the well and sampling for Monitoring Parameters may be used to fulfill this requirement. Groundwater elevations for all monitoring wells for a given groundwater body shall be measured within a period of time short enough to avoid temporal variations in groundwater flow which could preclude accurate determination of groundwater gradient and direction. The results of groundwater elevation monitoring shall be displayed on a water table contour map and/or groundwater flow net for the site and included in each monitoring report. The Discharger shall use the groundwater elevation monitoring data to estimate the following, as feasible: