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~1C, <br />• <br />• <br /> <br />MATERIALS AND METHODS <br />Field studies for this investigation were <br />conducted on May 17 and 18, 1989. During this <br />period, the canyon was surveyed Cor its geologic <br />characteristics, hydrologic features, vegetation, <br />soils and land uses. Geologic characteristics were <br />examined by walking the canyon and identifying <br />the valley bottom/canyon wall interface, bedrock <br />outcrop areas, and alluvial/colluvial deposits. A <br />drillrig was supplied by Custom Auger Drilling of <br />Denver, Colorado which was used to drill holes <br />for iUentification of the alluvial/cnlluvial material <br />and bedrock interface. All holes were drilled <br />using a four inch auger drill bit. <br />Hydrology investigations in the canyon have <br />been ongoing since early 1984. In April of that <br />year, flume station SCF-1 was established in the <br />lower canyon to continuously monitor water flow. <br />The flume was equipped with a Stevens Type F <br />recorder and was operated from April 19, 1984 <br />through August 26, 1985. During this period, <br />monthly visits were made to the flume to change <br />recorder charu and quarterly measurements of <br />water quality field parameters were collected. <br />Following the collection of 17 months of water <br />(low data, the Division approved a request to <br />suspend monitoring until secondary or retreat <br />mining was proposed under the canyon. Monthly <br />visits to the flume station began again in January <br />1989 to measure water (low and quality. During <br />the May 1989 field activities, six alluvial <br />piezometers were installed in drill holes adjacent <br />to the Santistevan Canyon stream channel. Holes <br />were drilled into the bedrock contact and slotted <br />two inch PVC was set into the holes which were <br />backfilled with drill cuttings. The piezometets <br />were monitored with a water level indica[or to <br />determine static water level in the formation. <br />Static water levels were checked twice on May 17 <br />and 18 and once on June 3, June 17, June 30 and <br />August 17. <br />During the May 1989 field activities, six <br />backhoe pits were also dug adjacent to the <br />alluvial piezometers [o determine the soil <br />conditions and potential for subirrigation. Pits <br />were dug to a depth of 72 inches and soil horizon <br />data was recorded. Following the collection of all <br />data, pits were backfilled and reclaimed. <br />Vegetation and land uses of the canyon were <br />mapped by driving and walking the bottom area. <br />Iand owners of the canyon were also interviewed <br />to determine past and present uses of the land. <br />2 <br />