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<br />14 I~larch ZOOI <br />' File No. 20200-008 <br /> Aggregate Industries West Central Region, Inc. <br />~ 3605 South Teller Street <br />~~ Lakewood, Colorado 80235 <br />' ~ A <br />i <br />M <br />L <br />C <br />C <br /> ttent <br />on: <br />r. <br />urn <br />. <br />oppage <br /> Subject: Geotechnical Addendum - 2000 Annual Report <br /> Morrison Quarry <br /> Morrison, Colorado <br /> Dear Curtt <br />UNDERGROUND <br />ENGINEERING do <br />ENVIRONJIENTAL <br />SOLUTIONS <br />Hairs i.>Icrtc;,.lni. <br />ll0 1Rth Greet <br />~ui[e y00 <br />Denc~r, CO S02U2-302 <br />Tel: 3U3.~3T.11U0 <br />Fax: 30353T.17ii <br />Email: DEV t~Halrv.'~' `":r. :om <br />' Haley & Aldrich, Inc. has completed the Geotechnical Addendum for the 2000 Notice of <br />Intent to Continue Mining Operations/Annual Report for the Morrison Quarry. The <br />Addendum is being submitted under separate cover by Haley & Aldrich to the Colorado <br />Division of Minerals and Geology (DMG) Co supplement the annual fee filing and Annual <br />Report form submittal made by Aggregate Industries made on 31 December 2000. <br />The Geotechnical Addendum was prepared in accordance with the Observational Approach <br />presented in Aggregate Industries' Mine Plan Amendment Nos. 4 and 5. Work included <br />general observations of highwall and slope conditions at the Morrison Quarry, geologic <br />' mapping of exposed rock faces at several final cut slopes established during the reporting <br />year, and comparison of observed conditions with baseline conditions assumed during design. <br />D~cE,s It has been our pleasure to continue working with you and with Morrison Quarry personnel to <br />' provide ongoing geotechnical stability evaluations and mine plan modifications. Please call <br />eo'fO° me if you have any questions, or if Haley & Aldrich can be of any additional assistance. <br />.\~Id-sadwsrlh <br />' Ctr+rfand Sincerely yours, <br />c.nllr HALEY & ALDRICH, INC. <br />Hartford <br />Qrp ^t'CI 'c uI J7 <br />/ ~ /_ r <br />LJdI tIrYIl10 / fff///LLL--- li'~"~ ` ~'-'L.~'~is <br />~land,r>trr Jay C. Davenport, E.i. Kent A. Pease, P.E. <br />~`'' H'"" I'~d"'`~ Staff Engineer Senior Engineer <br />Vr~+ark <br />' ~"`''' i''r"''I Enclosures <br />PurtlanJ <br />t'I"""' c: Mike Refer, File <br />Ruihrs4r <br />..\~ a' lord' G:~PROlECT5120200 Morrison Quarry~008~20001report4'Ofb gratthnical addeMum.doc <br />San Dir!n, <br />~.ILlornn~ <br />^.ui Fr,r maccu <br />~.Ihfornla <br />' l\',r>hinGtun <br />(~ntrrrt of L+rhuulan <br />