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MONITORING AND REPORTI9PROGRAM • -9- <br /> DEFENSE DISTRIBUTION REGION WEST TRACY <br /> SAN JOAQUIN COUNTY <br /> Type of Sampling <br /> Constituents Units Sample Frequency <br /> Volatile Organics µg/1 Grab Bi-monthly <br /> (Methods 8010 and 8020) (once every two months) <br /> Specific Conductivity umhos/cm Grab Bi-monthly <br /> (once every two months) <br /> pH pH Units Grab Bi-monthly <br /> (once every two months) <br /> Temperature °F/°C Grab Bi-monthly <br /> (once every two months) <br /> Water Level ft. MSL Meter Weekly <br /> BACKGROUND WELLS MONITORING <br /> The objective of this monitoring phase is to establish background level <br /> concentrations for inorganic constituents. <br /> MONITORING WELLS: <br /> Monitoring wells LM-11 , LM-12 and LM-63 shall be monitored as follows: <br /> Type of Sampling <br /> Constituents Units Sample Frequency <br /> Specific Conductivity gnhos/cm Grab Quarterly <br /> pH pH Units Grab Quarterly <br /> Temperature °F/°C Grab Quarterly <br /> Metals mg/l Grab Quarterly <br /> (Method 6010) <br /> Arsenic mg/l Grab Quarterly <br /> (Method 7060) <br /> Mercury mg/l Grab Quarterly <br /> (Method 7471) <br /> Selenium mg/l Grab Quarterly <br /> (Method 7740) <br /> Water Level ft. MSL Meter Quarterly <br /> Plan A At initiation and end of the injection of potable water to the <br /> injection wells. <br />