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<br /> <br />D.5 MONITORING AND ENVIRONPIENTAL PROTECTION STANDARDS <br />D.5.1 Leak Detection <br />The air pressure and flow rate into the well casing will be continuously <br />investigated. 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 1;he 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 vrater 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 the monitoring well shown on Figure D-1. Any leaks that <br />breech between the production zone and the overlying aquifer would be <br />apparent by sudden and substantial level fluctuations (as opposed to <br />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. <br />The monitor wells, referred to above, will be rotary drilled to a depth of <br />approximate]y 1,715 feet. A 5-1/2-inch diameter casing will be installed <br />• and cemented. After the casing is installed, the hole will be rotary <br />drilled an additional 50 feet, and left open for ground water monitoring. <br />