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Appendix-1 <br /> RETTEW,We answer to you. <br /> Environmental Resource Report <br /> Keenesburg Project <br /> Weld County, Colorado <br /> Prepared For: <br /> Colorado Sand Company LLC <br /> Prepared by: <br /> RETTEW Associates, Inc. <br /> 110 North Rubey Drive, Ste. 201 <br /> Golden, CO 80403 <br /> RETTEW Project# 114782000 <br /> April 2019 <br /> Engineers•Safety Consultants•Surveyors• Landscape Architects• Environmental Consultants <br />