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Sample Site <br />Designation <br />Sample Site Location <br />Purpose <br />DW -1 <br />1,000 feet east and 40 feet south of <br />the northwest comer of Section 19, <br />Township 22 South, Range 64 West. <br />Screened across the Dakota aquifer <br />Recently installed water supply well. Site will <br />be sampled to establish baseline groundwater <br />conditions within the Dakota aquifer. <br />MW -001 <br />1,440 feet west, and 200 feet north of <br />the southeast corner of Section 13 <br />Township 22 South, Range 65 West. <br />Screened across the Codell <br />sandstone. <br />Recently installed monitoring well. This well <br />would be abandoned if proposed monitoring <br />well MW -001A is approved for monitoring <br />groundwater in the Codell sandstone. <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />SECTION 3 <br />GROUNDWATER SAMPLING LOCATIONS AND SCHEDULE <br />The Dakota sandstone aquifer will be the source of potable supply for the mine and plant operation. <br />Groundwater in the St. Charles River alluvium is tributary to the St. Charles River and the Arkansas <br />River. The Codell sandstone, which may not be water- bearing, is the upper member of Carlile shale <br />formation and lies directly beneath the Fort Hayes limestone, the target resource of the Red Rock <br />Limestone Mine. <br />Groundwater samples will be collected from four wells at the Red Rock Plant and Limestone Mine <br />site (Site). Two monitoring wells to be installed within the St Charles River alluvial aquifer, which <br />will allow for characterization of alluvial groundwater as it enters and leaves the Site. The potable <br />water- supply well, designed by Leonard Rice and Associates and constructed by Layne Western <br />(Permit No.057033), will be a source of baseline water quality for the Dakota Aquifer underlying the <br />Site. A monitoring hole was recently installed in the Codell sandstone by Contour Consulting <br />Engineering, Inc. (Monitoring Hole No. 41499). Free water was not encountered during drilling of <br />the Codell sandstone well. <br />3.1 Sampling Locations <br />The location of the wells installed in the Dakota aquifer (DW -1) and the Codell sandstone <br />(MW -001) are shown on Figure 1. As MW -001 will likely be disturbed during mining, a second well <br />into the Codell sandstone is proposed (MW- 001A). MW -001A would be located north MW -001, in <br />an area were the Codell sandstone is likely to be intercepted. Monitoring of MW -001A will indicate <br />whether the Codell sandstone is a water - bearing unit and provide baseline water quality data for the <br />aquifer if it exists. The proposed locations of the St Charles River alluvial aquifer monitoring wells <br />(MW -002 and MW -003) are also presented on Figure 1. The final location of MW -002 and MW -003 <br />is subject to change based on field conditions, access, and observations during drilling at the time of <br />installation to ensure that both wells are located within the alluvium. The location of MW -002 will <br />be surveyed to ensure that construction of the St. Charles River bridge will not disturb the well. <br />Descriptions and purpose of sample locations are summarized in Table 3 -1. <br />Table 3 -1. Aquifer Sam Locations <br />P•\ Data\ GEN\ F -S -P -T \22421 \ Permitting \Snpulanon Response \Groundwater Sampling Plan \Condition 1 Groundwater Sampling Plan 2_28_03.doc <br />3 <br />