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MONITORING AND REPORTING PROGRAM 5 FOR CITY OF STOCKTON AUSTIN ROAD LANDFILL FACILITY CLASS III LANDFILL SAN JOAQUIN COUNTY Ground water sampling shall also include an accurate determination of the around water surface elevation and field parameters (pH, temperature, electrical conductivity, turbidity) for that Monitoring Point or Background Monitoring Point. Ground water elevations taken prior to purging the well and sampling for Monitoring Parameters shall be used to fulfill the ground water gradient/direction analyses required. For each monitored ground water body, the Discharger shall measure the water level in each well and determine ground water gradient and direction at least quarterly, including the times of expected highest and lowest elevations of the water level for the respective ground water body. Ground water elevations for all background and downgradient wells for a given ground water body shall be measured within a period of time short enough to avoid temporal variations in ground water flow which could preclude accurate determination of ground water gradient and direction. This information shall be included in the quarterly monitoring reports. Statistical or non -statistical analysis should be performed as soon as the monitoring data are available. 3. Ground Water Monitoring Field and laboratory tests shall be reported in the quarterly monitoring reports. All Monitoring Parameters shall be graphed so as to show historical trends at each well. The ground water surface elevation (in feet and hundredths, M.S.L.) in all wells shall be measured on a quarterly basis and used to determine the velocity and direction of ground water flow. This information shall be displayed on a water table contour map and/or ground water flow net for the site and submitted with the quarterly monitoring reports. The detection monitoring network shall consist of background monitoring well MW -2 and downgradient monitoring wells MW -12 and MW -13 in the upper water bearing zone and W-6 and W-7 in the lower water bearing zone. The evaluation monitoring wells shall be impacted wells W-1, MW -4, W-5, W-10, and W-11, W-3 suspected of being impacted, and monitoring wells MW -8 and W-9 located adjacent to the extraction wells . Locations of these wells are shown on Attachment B attached hereto and made a part hereof. Ground water samples shall be collected from all wells at the frequencies and analyzed for the parameters specified in Tables II and III.