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~, s <br />n~~ ~~~ ~s~~~~~~~ <br />CONSULTING GEOTECHNICAL ENGINEERS AND MATERIAL TESTING <br />February 24, 2004 <br />Greg Lewicki and Associates <br />11541 Warrington Court <br />Parker, Colorado 8Q~38 <br />Attention: Mr. Greg Lewicki <br />Subject: Haldorson Property near <br />Montrose, Colorado <br />Mr. Lewicki: <br />This letter summarizes some geotechnical engineering comments <br />regarding the subject property. The comments are based on our <br />experience with numerous geotechnical engineering studies in the <br />area. <br />It is our opinion that the proposed property is generally <br />hydraulically isolated from the groundwater source and conditions <br />of the Spring Creek Mesa area to the south and west by an exposed <br />ridge of Mancos Shale and to the east by a deeply incised <br />drainage channel, referred to as Mexican Gulch. <br />The Mancos Shale typically has low permeability which resists <br />groundwater movement except along fractured zones which are <br />typically small and isolated. The general location of the Marcos <br />Shale ridge is shown on the attached figure. <br />Mexican Gulch is deep and completely penetrates the sand and <br />gravel cap of Spring Creek Mesa. The sand and gravel cap is <br />generally the permeable material which stores and transmits <br />groundwater. <br />The general trend of the area is down to the northeast. This <br />leads to the likelihood of potential water sources north of the <br />site to flow to the northeast and away from the site. <br />PN: M04030GE <br />Because the gravel layer is discontinuous to the east the <br />ground water is not able to travel to the site from the east. <br />The Mancos Shale to the south and west of the site resists <br />groundwater movement to the site from the south and west. The <br />only likely source of groundwater charge is from irrigation very <br />local to the site, such as the irrigation water applied directly <br />on the surface of the site and the small agricultural area <br />immediately adjacent to the site. It is not likely that <br />sufficient water is applied to the site or the area adjacent to <br />the site to result in significant groundwater on the site. <br />P. O. BOX 9888 <br />GRAND JUNCTION. CO 8150'1 <br />(oTO) z45~5505 <br />P. O. BOX 0045 <br />LIONTROSE, CO 81082 <br />(eTO) uazlu <br />214 BODO DR. <br />D1IRANGO, CO 81381 <br />(D70)259~5885 <br />