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Ralston Quarry Slope Stability <br /> PURPOSE AND SCOPE OF STUDY <br /> This report presents the results of a geotechnical and slope stability evaluation <br /> performed by GROUND Engineering Consultants, Inc. (GROUND) of the west-facing <br /> slope on the Asphalt Paving Company aggregate quarry property north of Golden, <br /> Colorado. Our study was conducted in general accordance with GROUND's Proposal <br /> No. 1807-1305, dated July 23, 2018. <br /> We understand that Asphalt Paving Company has been required to develop a remedial <br /> approach to provide long term stability of the west-facing slope of the ridge facing <br /> Ralston Reservoir. We also understand that Asphalt Paving Company has been asked <br /> to evaluate the long term stability of the stockpile where material displaced in a recent <br /> slope failure has been placed. <br /> A field exploration program was conducted to obtain information on the surface and <br /> subsurface conditions. Material samples obtained from several test holes were tested in <br /> the laboratory to provide data on the classification and engineering characteristics of the <br /> on-site soils. Subsequently, a number of test pits were excavated to obtain additional <br /> subsurface data. This report has been prepared to summarize the data obtained and to <br /> present our findings and conclusions based on the subsurface conditions encountered to <br /> develop approaches to stabilize the slope in question. This revised study includes slope <br /> stability analyses in addition to those previously performed for GROUND's January 18, <br /> 2019, report.' <br /> This report should be understood and utilized in its entirety; specific sections of the text, <br /> drawings, graphs, tables, and other information contained within this report are intended <br /> to be understood in the context of the entire report. This includes the Closure section of <br /> the report which outlines important limitations on the information contained herein. <br /> This report was prepared for the planning purposes of the Asphalt Paving Company <br /> based on our understanding of the project at the time of preparation of this report. The <br /> ' GROUND Engineering Consultants, Inc, 2018, Limited Geotechnical Evaluation, Slope Stability and <br /> Remediation Approach, Ralston Quarry, Jefferson County, Colorado, Revised2, Job No 18-3046, <br /> prepared for Asphalt Paving Company, dated January 18 <br /> Job No. 19-1235 GROUND Engineering Consultants, Inc. Page 1 <br />