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FEB-03-2003 MON 04 10 PM ROCKY MTN CONSULTANTS FRX N0. 3036656959 P, 03 <br />TETRATECH RMC <br />February 3, 2003 <br />Mr. Jeff Gregg <br />Hall-ltwin Corporation <br />P.O. Box 2150 <br />Greeley, Colorado 80632 <br />Re: Hall-Irwia Corporation, The Shores Resource, Town of Firestone, Colorado, <br />Review of Revised Amended Mining Plan 1n Regards to Structures within <br />200 feet of Mining, Tetra Tech RMC J'ob No. 80-0636.026.04 <br />Dear Mr. Gregg: <br />Previously, we performed stability analyses with regards to structures located within 200 feet of the <br />Shores Resource. The results of our analyses were summarized in our letter of January 28, 2003. <br />Subsequently, Hall-Irwin made revisions to the mining plan with regards to future oil/gas wells at the <br />site. <br />The minor revisions involve local changes in the location of the site slurry walls as well as local <br />revisions of the areas to be mined. The revisions were required to allow areas for future oi]/gas walls <br />near the mine. The mining will not encroach within 150-feet of the proposed oiUgas wells. <br />The minimum setbacks 1mm structures within 200•feet of the mine in the revised plan are consistent <br />with the setbacks used in our previous analyses. In light of this, the revised mining plan should not <br />pose a hazard to nearby structures- <br />LIML9TIONS <br />Our review and previous analyses are based on regional geologic mapping, present mining plans, <br />bore hole data, and stability analyses using typical soil strength parameters. Should the nvniag plans <br />change or subsurface conditions vary from those portrayed in this letter, we should be contacted in <br />order to re-evaluate the potential affects on man-made anuctures. <br />Please call with any questions or comments. <br />Sincerely,,. <br />TET~RA/ Ti/''E'~` RMC <br />JV / <br />Gary Linden, RG. <br />Engineering Geologist <br />cc: Danna Ortiz, Tetra Tech RMC (with Attacfunents) <br />N:V3]d 0261W4,ubIV6aa SWnlity &NIwO.Ip.Ex <br />1900 S. Sunset Sveet, Suite 1-Q LongmonC CO yU501 <br />Tel 303.771.5282 Fax 303.665.6959 <br />wwW.tlffftc.cOm <br />