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III. COMMENTS -COMPLIANCE <br />Below are comments on the inspection. The comments include discussion of observations made during <br />the inspection. Comments also describe any enforcement actions taken during the inspection and the <br />facts or evidence supporting the enforcement action. <br />This was a partial inspection of the Edna Mine conducted by Tom Kaldenbach of the Colorado Division <br />of Minerals and Geology. No one else was present. The mine site is snowed in. <br />HYDROLOGIC BALANCE <br />Stream Sampling Procedure - As part of the inspection, I measured the <br />conductivity of stream water at seven locations outside the permit area in <br />Trout Creek and the Yampa River. The purpose of the measurements was to <br />identify any cumulative impacts of mining on Trout Creek. All the <br />measurements were made within a two-hour period in order to provide a <br />"snapshot" of impacts occurring in the watershed at that time. I measured <br />the conductivity, temperature, and pH of each sample. I collected the <br />samples at bridges on county roads by dropping a bucket on a rope into the <br />stream. <br />Results of Sampling - All pH values were near 8.0. Conductivity values <br />ranged from 500 to 700 mmhos/cm in Trout Creek downstream from mining. <br />These conductivity values indicate the coal mines in the Trout Creek <br />watershed were not causing the stream's water to exceed the Division's <br />1,000 mmhos/cm material damage suspect level for irrigation water in <br />northwest Colorado. The conductivity values of the samples are shown on the <br />map below. <br />3 <br />