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• D.5.1 Leak Detection <br />The air pressure and flow rate into the well casing will be continuously <br />envestigated. If excessive air flows occur, the cause will be indicated. <br />In the unlikely event of a casing failure, production will cease, saltwater <br />will be removed from the well casing, and corrective measures will be <br />instituted to repair the leak. Corrective measures may include application <br />of a spray sealant to the interior of the pipe or, if necessary, the <br />installation and cementing of an inner sleeve casing. <br />In addition to air pressure and flow monitoring, water flow will be <br />monitored in both the injection and recovery wells to permit calculation of <br />a water balance. The water balance will consider water injected, water that <br />occupies the volume of dissolved nahcolite, minor amounts of water that <br />permeates the Boies Bed, and water flow recovered from the well. The water <br />balance may prove to be an inprecise measure of leakage, however, mainly <br />because the rate of water permeation into the Boies Bed is yet unknown and <br />• may vary with time. <br />D.5.2 Monitoring Wells <br />A third means of leak detection involves continuous monitoring of the <br />piezometric head in i:he three monitoring wells shown on Figure D-1. Any <br />leaks that breech between the production zone and the overlying aquifer <br />would be apparent by sudden and substantial level fluctuations (as opposed <br />to seasonal fluctuations). Water quality monitoring will also provide an <br />additional indication of leakage. Water quality samples will be obtained on <br />a monthly basis. Any effects on the lower aquifer will be immediately <br />reported to the MLRD, and the water sampling frequency will be increased to <br />once per week. <br />The monitor wells, rei~erred to above, will be rotary drilled to a depth of <br />approximately 1,715 feet. A 4 1/2- to 5 1/2-inch diameter casing will be <br />installed and cemented. After the casing is installed, the hole will be <br />. rotary drilled an additional 50 feet, and left open for ground water <br />monitoring. The well. will be equipped with continuous graphic water level <br />monitoring instrumentation. <br />D-13 <br />