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UNDERGROUND <br /> ENGINEERING& <br /> ENVIRONMENTAL <br /> SOLUTIONS <br /> Haley&Aldrich,Inc. <br /> 1600 Broadwav,Suite 1125 <br /> Denver,CO 80202-4911 <br /> Tel:303.832.9636 <br /> Fax:303.832.9616 <br /> Email:DEN«HalevAldrich.com <br /> 25 July 1997 <br /> File No.: 20200-002 <br /> CAMAS Colorado <br /> Support Services Group <br /> ' 3605 South Teller Street <br /> Lakewood, CO 80235 <br /> Attention: Mr. Curtt L. Coppage <br /> Manager of Geology &Resources <br /> Subject: Geotechnical Addendum <br /> 1996 Notice of Intent to Continue Mining Operations/Annual Report <br /> Dear Curtt: <br /> On behalf of CAMAS Colorado/Cooley Gravel Division(CAMAS), Haley & Aldrich, Inc. has <br /> prepared the Geotechnical Addendum for the 1996 Notice of Intent to Continue Mining Opera- <br /> tions/Annual Report for the Morrison Quarry. The Addendum is to be submitted to the <br /> Colorado Division of Minerals and Geology (DMG) to supplement the annual fee filing and <br /> ' Annual Report form submittal made by CAMAS at the end of December 1996 and on 6 March <br /> 1997, respectively. <br /> The Geotechnical Addendum(Pike all previous:addenda) was prepared in accordance with the <br /> ' Observational Approach presented in CAMAS' Mine Plan Amendments Nos. 3 and 4. Work <br /> included general observations of highwall and slope conditions at the Morrison Quarry, <br /> geologic mapping of exposed rock faces (particularly at final cut slopes), and comparison of <br /> ' OFFICES observed conditions with baseline conditions assumed during design. <br /> Boston <br /> massaclwsetts In addition, geotechnical field investigations and design updates were performed for the East <br /> ' Cleveland Highwall of the Central Quarry as the result of a localized slope failure. The slope failure was <br /> Olio investigated by drilling core borings, conducting laboratory testing, surveying, and performing <br /> Hartford geologic mapping. Remedial design work included slope stability analyses, a revised slope <br /> ' Connecticut configuration in the vicinity of the failure and minor modifications to the mine plan for the <br /> Los Angeles Central Quarry. This work also resulted in the submittal (approved by DMG) of a Technical <br /> California Revision to the Mine Plan during the 1996 calendar year. The Technical Revision did not <br /> ' Manchester change either the permitted acreage or the previously approved Limits of Disturbance, but did <br /> New Hampshire expand the Limits of Mining along the East Highwall of the Central Quarry. <br /> ' Portland <br /> Maine <br /> Rochester <br /> G:\PROJECrS\20200\002\96ANNREP.LTR <br /> ' New York <br /> San Francisco <br /> California <br /> ' Washington <br /> District of Columbia <br />