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<br />4.3.2 Production Wells <br />No chloride contamination has been detected in cavity 1A or cavity 3A. Slight chloride <br />influx has been detected in cavity 4A. This influx is easily controlled with the dilution <br />created during plant operation. Mud/cement levels of production wells were to surface <br />throughout the year as required. <br />4.3.3 Monitoring Wells <br />• <br />No new monitoring wells were drilled or completed in 2000. Monitoring wells 90-2, EX- <br />2, 4A-1V, 93-2M, and DS-2 are all equipped with pressure transducers with continuous <br />water levels (WL) readouts, which are available in the control room. Production well <br />90-5 was utilized for WL monitoring until July. In addition there are fourteen wells <br />equipped with pressure transducers, which record WL continuously and the readouts <br />are reported monthly. Pressure transducers and access wires were replaced in <br />numerous wells as needed during 2000. Water quality data is collected from sixteen wells. <br />Fifteen are dedicated to monitoring and one is also used as raw water well. Additional <br />water quality cleanup work is planned on IRI-4 and 90~ in 2001. <br />4.3.4 Geotechnical Program <br />• <br />A long term, time-domain-reflectometry monitoring program associated with well 4A-5M <br />showed no indication of subsidence in 2000. There has been no indication of subsidence <br />from this well since installation. No major drilling program is planned which will significantly <br />advance the geotechnical program in 2001. <br />19 <br />