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SEF 05 '89 13:44 LUHDORFF'=CALMANINI WOODLAND P.9/1 <br /> 27 <br /> migration away from the Briners ponds has been estimated. It is not possible with the <br /> current network to characterize the extent of saline water migration northwest of the <br /> ponds or to identify whether saline water has migrated vertically beneath the first <br /> aquifer, i.e. to depths greater than 175 feet. Principally for those reasons, but also to <br /> accomplish other monitoring objectives as described below, additional monitoring <br /> facilities are recommended at two locations (Figure 22). <br /> Northwest of Ponds - It is recommended that one shallow monitoring well (MW2) be <br /> constructed at a location approximately 600 feet northwest of the north evaporation <br /> pond. A well at this location would accomplish two main objectives. It would provide a <br /> water level control point which would allow confirmation of the direction of flow and <br /> gradients during pumping and none, .,,ping seasons. A well at this location would also <br /> identify whether saline water has migrated from the ponds in the direction of regional <br /> ground-water flow. A single completion four-inch diameter monitoring well is <br /> recommended for completion to a depth similar to that of MWl (total depth <br /> approximately 180 feet, screen interval approximately 140 to 175 feet). <br /> Southwest of Ponds - It is recommended that two monitoring wells, a "shallow" well <br /> (MW3A) and a deeper well (MW3B), be constructed at a location southwest of the <br /> south evaporation pond, between that pond and well P5. Monitoring facilities at this <br /> location would accomplish several objectives. Water levels monitored in both wells <br /> would be analyzed to determine vertical gradients during pumping and nonpumping <br /> seasons. Well MW3B, the deeper completion, would aid in identifying whether saline <br /> water has migrated beneath the first aquifer. Salt concentrations, particularly chlorides, <br /> would be monitored to determine the influence of pumping at well P5 on saline water <br /> migration from beneath the ponds. Finally, the wells will allow monitoring of salt <br /> concentrations during closure and post closure of the ponds. Similar to the well <br /> proposed northwest of the ponds, two 4-inch diameter monitoring wells are <br /> recommended. The shallower well (MW3A) would be completed to a depth similar to <br /> MW1, approximately 1800ffe t, and wouir .,:ve a similar screened interval, approximately <br /> 140 to 175 feet. It is anticipated that th ieeper well (MW3B) would be con pleted to a <br />