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-13- <br />~ As part of this study, measurements of temperature and specific <br />I conductivity were made in September, 1979 in streams, springs <br /> or seeps, and wells in the vicinity of the mine. ?Measurements <br />` were made at sixteen of the previous measuring points. Most of <br />1 these measurements Caere made at stream sites as several of the <br /> wells sampled in the pre-mining (1974 to 1975) time period were <br /> not located, or no longer existed. ^leasurements made in springs, <br /> seeps and streams are considered representative of the actual <br />measurements <br />Measurement <br />w <br />i <br />ll <br />h <br /> . <br />s <br />n <br />e <br />s, <br />owever, may not actually <br /> represent the condition of the aquifer. The wells were not <br /> continuously pumped prior to sampling and the quality measure- <br /> ments may be representative of the water in the well. The wells, <br />l however, were bailed for some time before a sample was collected. <br />' Temperature and specific conductivity measurements were made <br /> using a conductivity meter borrowed from the U. S. Bureau of <br />• Land tianagement office in Craig. The meter was tested in 200, <br />L 1,400 and 8,000 mmho/cm solutions to check the accuracy of the <br /> meter. The meter correctly recorded the conductivities in each <br />L solution. <br /> The measurements made in 1979 are plotted on Figure 1 and pre- <br /> sented along with a short description of each sample site in <br />L Table 2. The average conductivity of streams in the area was <br /> 966 mmhos, ranging from 650 mmhos upstream on Good Spring Creek <br />L to 1,400 mmhos at Axial on Good Spring Creek. The well and <br />spring measurements av <br />b <br />d <br /> erage <br />a <br />out 1,100 mmhos, ranging from <br /> 550 mmhos from a well on 47ilson Creek to 1,880 at a seep from <br /> a coal seam exposed in the pit. The pit water was considered <br /> separately from the other samples as the orater quality is con- <br />1 centrated by evaporation from this open body of water. The spe- <br /> cific conductivity of the pit water was measured about 2,000 <br /> mmhos. <br />,• <br /> <br />Leonard Rice Consulirng Water Engineers. Inc. <br />