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/~ <br />`~ atheson <br />M inin <br />C onsul~ants, Inc. <br />iiiiiiiiiiiiiiiiiii <br />11460 W. 44th Ave., Suite 6 <br />Wheat Ridge, Co 130033 <br />303-456-56313 <br />Fax 303.456-5639 <br />July 7, 1999 <br />Mr. Ross Gubka <br />New Horizon Coal Company <br />27646 West 5th Avenue <br />Nucla, CO 81424 <br />Re: Daniel's Residence, 910 Grape Street, damage investigation. <br />Dear Mr. Gubka; <br />Enclosed is Matheson Mining Consultants, Inc. (MMC) inspection of the Daniel's <br />residence located at 910 Grape Street Nucla, Colorado. The structure is a single story <br />stucco sided building set on a concrete foundation. Extensive hair{ine cracking of the <br />exterior stucco was noted in the inspection. The interior exhibited some minor cosmetic <br />flaws in the drywall, primarily cracking along tape lines between dry~+alt sheets. In <br />addition to inspecting the structure MMC reviewed blasting and seismograph records <br />from the New Horizon Mine. MMC concludes from the inspection of the stntcture and <br />the blast records that their is no probability drat any of [he damage observed was caused <br />b}' blasting. <br />The United States Bureau of Mines conducted extensive investigation into blast <br />vibrations and damage. Their conclusions aze summarized in United States Bureau of <br />Mines (USBM) Report of Investigations (RI) 8507 published in November 1980. The <br />USBM non-damage criteria has not been exceeded at the distance from blasting to the <br />house in question. The vast majority of New Horizon Mine blasting is within the USBM <br />non-damage criteria al less than '/, of the distance from 910 Grape Street to the blasting. <br />MMC's opinion is that the stucco cracking on the exterior of the structure is due to the <br />following: <br />Gradual sett{ement of the structures foundation, possibly due to poor drainage. <br />Heating, cooling and environmental factors producing stresses on the <br />materials composing the structure. <br />Lack of maintenance of the structure, especially weed control within one foot <br />of the foundation. <br />