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MONITORING AND REPORTIN•PROGRAM • -8- <br /> DEFENSE DISTRIBUTION REGION WEST TRACY <br /> SAN JOAQUIN COUNTY <br /> Type of Sampling <br /> Constituents Units Sample Frequency <br /> Total Petroleum HCs mg/l Grab Quarterly <br /> (Method 418.1) <br /> Pesticides - PCBs ug/1 Grab Quarterly <br /> (Method 8080) <br /> Metals mg/1 Grab Quarterly <br /> (Method 6010) <br /> Arsenic mg/1 Grab Quarterly <br /> (Method 7060) <br /> Mercury mg/l Grab Quarterly <br /> (Method 7471) <br /> Selenium mg/1 Grab Quarterly <br /> (Method 7740) <br /> Water Level ft. MSL Meter Monthly <br /> INJECTION WELLS MONITORING: <br /> During the injection of treated ground water into injection wells IW-1 , IW-2 and <br /> IW-3, the following monitoring program shall be conducted: <br /> Type of Sampling <br /> Constituents Units Sample Frequency <br /> Total Volume of gallons Meter Weekly <br /> Water Injected <br /> Injection Rate at Time gpm Meter Weekly <br /> of Sampling <br /> Average Injection Rate gpm Meter Weekly <br /> (since last sampling) <br /> Pressure at Time psig Meter Weekly <br /> of Sampling <br /> Water Level ft. MSL Meter Weekly <br /> PERFORMANCE MONITORING WELLS: <br /> The monitoring wells for the ground water injection system shall include the <br /> Ensotech, Inc. wells (MW6, MW7, MW8, MW9, and MW10) and the RI/FS wells (LM71 , <br /> LM27A, LM4, and LM 79). These wells shall be monitored as follows: <br />