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ROCKCASTLE COMPANY <br />Grassy Gap Mine <br />Seep and Spring Survey <br />INTRODUCTION <br />ACZ INC. (ACZ) performed the annual seep and spring survey for the spoil areas <br />of the Grassy Gap Mine located in Routt county, Colorado. The survey was done <br />by Robert Peterson and Tom Leidich, ACZ engineers, on June 28 and 29, 1991. <br />The mine has been reclaimed and the downgradient perimeters of the spoils were <br />inspected for moist soil (seep) and springs. <br />FIELD METHODS <br />Pits 1, 2, 3, 4, 5, and 6 spoils were inspected for seeps and springs. Seeps were <br />identified by moist soils and vegetation changes. Ground water flows at the <br />ground surtace were considered springs. The areas inspected included <br />roadcuts, diversions, sediment ponds and the naturally vegetated areas <br />downslope and/or down geologic dip from the reclaimed pits. <br />The survey was performed on foot with access to each pit in a 4-wheel drive <br />vehicle on existing access roads. Field parameters including temperature, pH, <br />and electrical conductivity were measured directly from spring waters using a <br />Hydac digital conductivity, temperature, pH meter. The meter was calibrated <br />using pH controlled buffer solutions prior and subsequent to the field <br />measurements. The meter sample basin and probe were rinsed with distilled <br />water prior to each measurement. Where possible, the spring flow was <br />measured using a known capacity container and a stop watch. No <br />measurements were taken for the seeps. <br />RESULTS <br />The field survey identified 6 springs and 5 seeps on the perimeter of Pits 2, 4, 5, <br />and 6. Refer to Map 1, Seeps and Springs, for their location. No seeps or <br />springs were found associated with Pit 1 or 3. The field measurements for the <br />springs are shown in Table 1, Spring Field Measurements. Springs 1 and 2, near <br />