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~~ SCOTT, COX & ASSOCIATES, INC. ~~mvdunyi•„{ntr~•r~ • <iirv~~~~r. <br />December 11, 2006 <br />Hart Environmental <br />P.O. Box 1303 <br />Boulder, Colorado 80306 <br />Attn: Mr. Michael Hart <br />Dear Mr. Hart: <br />Projeci^ 06605 <br />This report should be considered to be an addendum to our original report <br />rnncerning the proposed Camenish Borrow Pit (to be located north of Weld <br />County Road 20 ~ and west of Weld County Road 7 in Weld County, Colorado). <br />The original report is dated December 6, 2006. Since the preparation of that <br />report we have reviewed the revised mining plan map, which includes a mining <br />exclusion area for the gas well on the property and the conveyance piping that <br />serves the well. Also, the new mining plan eliminates the stockpile areas, <br />resulting in the offset of the proposed mined area to be within 200 feet of the <br />adjacent Godding Ditch. Additionally, we understand that, although our report <br />documents an angle of repose of approximately equal to a slope of 2:1, a <br />shallower cut of 3:1 has been proposed for use at this site. <br />Tn our original report we discussed the slope stability of the cut banks, based on <br />the angle of repose of the site soils. Slumping of earth banks is mmmon, if the <br />banks are cut steeper than the angle of repose (which is the angle that the soil <br />will seek naturally, due to the frictional interactions of the soil particles). We <br />have seen circular landslide analyses done, to accomplish this same thing. <br />However, such failures are very raze in sand and gravel pits, where the banks <br />have not been cut steeper than the natural angle of repose of the soil. Essentially, <br />if the bank is cut to be no steeper than the angle of respose, then soil stresses <br />beyond the cut line are insignificant. <br />I~SU '. "tth }Mr~~t R~etld~v,l~d~~nidi~Tn 3flI :IUL-II-I.;u.t t.i.,:~i;..i-bi-, ~~, <br />