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MONITORING AND REPORTING PROGRAM -6- COUNTY OF SAN JOAQUIN NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL CLASS III LANDFILL SAN JOAQUIN COUNTY 3. Detection Monitoring Program For each monitored medium, all Monitoring Points assigned to detection monitoring, and all Background Monitoring Points shall be monitored once each calendar quarter for the Monitoring Parameters listed in this Program. For any given monitored medium, a sufficient number of samples shall be taken from all Monitoring Points and Background Monitoring Points to satisfy the data analysis requirements for a given Reporting Period, and shall be taken in a manner that ensures sample independence to the greatest extent feasible. Ground water sampling shall also include an accurate determination of the ground 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, incluing the times of expected highest and lowest elevations of the water level for the respectidve 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 around water gradient and direction. This information shall be included in the quarterly monitoring reports. Statistical or non-statistical analysis shall be performed as soon as the monitoring data are available. 4. Ground Water Monitoring 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 Lyround water flow net for the site and submitted with the quarterly monitoring reports. The monitoring network shall consist of background monitoring well G-1 and downgradient monitoring wells G-2 and G-3. Locations of these wells are shown on Attachment B. Samples shall be collected from the wells at the frequency and for the parameters specified in Table H.