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31 <br /> Approximately 2 years of discharge data for the Allen and Maxwell Mines <br /> are tabulated in Appendix C, Table Cl . The mean discharge from the Maxwell <br /> is 15 gpm which falls within the range shown in Table 4. The mean discharge <br /> for the Allen Mine is 73 gpm. Comparison of the present Allen and Maxwell <br /> discharges with those calculated in Table 4 suggests that a high degree of <br /> confidence can be placed on the calculated discharges. This comparison also <br /> indicates that the controlling hydraulic and geologic parameters at the <br /> jMaxwell are very similar to those at the Allen. <br /> Alluvial Studies <br /> Investigation of the near-surface ground water along the PUrgatoire <br /> River in the study area was made by drilling 8 holes through the alluvium <br /> to bedrock and the excavation of several backhoe pits. From the informa- <br /> tion obtained, two cross sections, showing the alluvial and strath terraces, <br /> were prepared and are shown on Plates 2 and 3 in the map pocket. The <br /> 1 locations of the sections are indicated on Plate 1B. Of particular importance <br /> to the hydrologic investigation is the fact that ground water was encountered <br /> only in the alluvium directly in contact with the river and that the thickness <br /> and lateral extent of this material is quite limited. <br /> Three of the 8 holes were drilled and cased at the Allen Mine and will <br /> be discussed further in the context of the water quality investigations. The <br /> remaining 5 holes were drilled at the Maxwell study area and three of these <br /> wells were cased with perforated steel casing. The locations of the cased <br /> wells are indicated on Plate 1B where it is shown that wells Al 3-3 and <br /> AL 4-2 are on the upstream (west) and downstream (east) boundaries of the <br /> Maxwell study area (respectively) , immediately adjacent to the stream. Wells <br /> AL 1-1 , AL 1-2, and AL 2-1 are located in the immediate vicinity of the <br /> active waste dump at the Allen Mine. <br /> Auger hole tests were performed to determine the hydraulic �n nductivity <br /> of the alluvual materials. The procedures for conducting and analyzing auger <br /> hole tests are described in Bavel and Kirkham (1948) and in the National <br /> Engineering Handbook, Section 16, United States Soil Conservation Service. <br /> The auger hole data are presented in Appendix D, Table D1 through D3 and the <br /> analyses are shown on Figures 8 through 10. The hydraulic conductivity <br />