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LACHEL -~ <br />ASSOCIATES_ __.- :_ <br />Geccecnnics S Undergrcund Structures <br />,Id(~i 0~ ~9 r <br />January 6, 1997 <br />Mr. John Hickman <br />Western Mobile <br />1590 West 12th Ave. <br />Denver. Colorado 80204 <br />Dear Mr. Hickman: <br /> <br />~c~~2 ~=KE<ic <br />~irllNG ~~rS~o/ <br />RE: Deer Creek Canyon Quarry <br />Jefferson County, Colorado <br />~l4r r <br />frDn <br />On December 23, 1996, LACHEL & Associates, Inc., Golden, Colorado provided you an <br />addendum to our initial report titled A Soil and Rock Slooe Stabilitv Evaluation of the Deer <br />Creek Canvon Quarrv. Subsequent to that addendum please find the following information <br />regarding bench heights for the subject project. <br />Using the topographic map that was produced subsequent to the initial report, the <br />maximum height of Bench 1 is 61 ft at the headwall and 115 ft for the sidewall. The <br />maximum heights of Benches 2, 3 and 4 are 71 ft, 50 ft and 45 ft respectively. These <br />heights represent a top of talus to top of bare bedrock face distance. The maximum <br />heights of Benches 5 and 6 are 7 ft and 12 ft respectively; however, these headwalls have <br />been reclaimed (i.e. graded and vegetated). The variation in the height of the benches in <br />no way alters the conclusion of the report that at the time of the field examination, no mass <br />failures were evident or expected. <br />We hope that this information clarifies the data in the report and addendum and clears up <br />any conflicts in the project data. <br />If you have any questions, please do not hesitate to contact me. <br />Regards, <br />LA HEL 8 Associates, Inc. <br />ennis'J. Lachel <br />President <br />DJL:sb <br />P.O. co:c =2~c Golden. Colorado 80401 (303) 279-4321 Fax (303) 279-0414 <br />