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l~ I <br />Dfmitaiog Well ImteBatim - Dome PILL <br />1.0 INTRODUCTION <br />Western Technologies Inc., (WT) was retained by Southwestern Portland Cement Company to <br />install ground water monitoring wells at Dowe Flats. The purpose of the wells is to provide <br />baseline groundwater quality data Cor a Colorado Mined Land Reclamation Board permit <br />application. On Monday, June 4, and Tuesday, June 5, 1990, four monitoring wells were <br />installed. Empire Laboratories, Inc., provided drilling and well installation services. Split spoon <br />soil samples were collected at 5 feet depth intervals for field screening and geologic <br />characterization. A monitoring well location map is provided in Plate 1. Appendix A contains <br />the geologic logs oC boreholes, and Appendix B contains the well completion diagrams. The <br />following sections of this report detail: <br />• Monitoring Well Locations <br />• Drilling Activities <br />• Monitoring Well Completion <br />2.0 MONITORING WELL LOCATIONS <br />• The locations of the four monitoring wells are presented in Plate 1. All wells are completed in <br />the shallow alluvial aquifer. DFMW-1 is upgradient of the mining operation and DFMW-2, 3 and <br />4 are downgradient. Ground water contamination from the Syntex chemical landfill is <br />upgradient of DFMW-l, therefore this well will provide baseline data on the effects, if any, of <br />potential Syntex contamination. <br />Monitoring well DFMW-1 is located in an ephemeral stream channel near the northern boundary <br />of the property and south of the St. Vrain Water Supply Canal. Monitoring well DFMW-2 is <br />located near the southwest corner oC the site, between Highway 66 and the Palmerton Ditch. <br />Monitoring well DFMW-3 is located near the southeast corner of the Garner Dairy, north of the <br />Rough and Ready Ditch. Monitoring well DFMW-4 is located near the southeast corner oC the <br />site, along the south bank oC the Palmerton Ditch, south of the Hall Farm. <br />Project N~ber. T6~97-0IS <br />]uly 11, 1980 <br />• Pe4e 1 <br />