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MONITORING AND REPORTING PROGRAM 4 FOR CLOSURE AND POST-CLOSURE MAINTENANCE OF HARNEY LANE CLASS III LANDFILL SAN JOAQUIN COUNTY 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 semiannually, 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 semi-annual monitoring reports. Statistical or non-statistical analysis shall be performed as soon as the monitoring data are available. 2. Ground Water Monitoring Program 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 ground water monitoring network shall consist of background monitoring well MW1 and downgradient monitoring wells MW2, MW3, and MW4. Samples shall be collected from all wells and analyzed for the parameters and at the frequencies as specified in Table I - Ground Water Monitoring Program. Locations of these wells are shown on Attachment B.