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• GP1. This map shows that the water-level elevation in the Flume <br />alluvial system is higher than the Third White Sandstone water- <br />level elevation at the upper end o£ the mine area. but becomes <br />lower than the Third White Sandstone head in the northern end of <br />the Trapper permit in this area near the Coy test hole. The <br />alluvial system probably acts as a recharge to the Third White <br />Sandstone in the upper reaches of the permit area. where the <br />confinement between these two sand lenses is not great, while some <br />flow of ground water from the Third White Sandstone into the Flume <br />alluvial ground water system may occur in the northern portions of <br />the permit area due to the higher head in the Third White <br />Sandstone. Map 2-3 of Hydro-Engineering (1992) should be reviewed <br />• for the piezometric surface of the Third White Sandstone. Also, <br />Maps 2-1 and 2-2 present the water-level elevations for the QR and <br />HI aquifers, respectively, in the 1992 annual monitoring report. <br />The QR and HI water-Level elevations are presented on Map M-59 <br />also, with each of these-lower aquifer units having lower heads due <br />to their greater depths. <br />The piezometric surface in the Flume alluvial system decreases <br />in elevation similar to the land surface elevation in the Flume <br />channel. Presently, the water-level elevations in the Coy area are <br />approximately 30 feet below the present land surface, while water- <br />level elevations in the GC site are approximately 15 feet below the <br />channel surface. The gradient in the Elume alluvial system should <br />steepen in an upstream direction due to the increase in gradient of <br />the surface topography. OlYIS® ll/dt/92 <br />2-676c - ~ i <br />~.= , <br />.K _2-c(. _ 93- -~ <br />;~ <br />..:. . <br />