2004-08-19_REVISION - M2003037 (4)

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m~ ~~~ ~~~i~f~$ CONSULTING GEOTECHNICAL ENGINEERS AND MATERIALTESTING Greg Lewicki and Associates 11541 Warrington Court Parker, Colorado 80138 Attention: Mr. Greg Lewicki Subject: Haldorson Property near Montrose, Colorado Mr. Lewicki: February 24, 2004 PN: M04030GE This letter summarizes some geotechnical engineering comments regarding the subject property. The comments are based on our experience with numerous geotechnical engineering studies in the area. It is our opinion that the proposed property is generally hydraulically isolated from the groundwater source and conditions of the Spring Creek Mesa area to the south and west by an exposed ridge of Mancos Shale and to the east by a deeply incised drainage channel, referred to as Mexican Gulch. The Mancos Shale typically has low permeability which resists groundwater movement except along fractured zones which are typically small and isolated. The general location of the Mancos Shale ridge is shown on the attached figure. Mexican Gulch is deep and completely penetrates the sand and gravel cap of Spring Creek Mesa. The sand and gravel cap is generally the permeable material which stores and transmits groundwater. The general trend of the area is down to the northeast. This leads to the likelihood of potential water sources north of the site to flow to the northeast and away from the site. Because the gravel layer is discontinuous to the east the ground water is not able to travel to the site from the east. The Mancos Shale to the south and west of the site resists groundwater movement to the site from the south and west. The only likely source of groundwater charge is from irrigation very local to the site, such as the irrigation water applied directly on the surface of the site and the small agricultural area immediately adjacent to the site. It is not likely that sufficient water is applied to the site or the area adjacent to the site to result in significant groundwater on the site. P. 0. BOX 3986 P. O. BOX 0045 214 BODO DR. GRAND JUNCTION, CO 81802 MONTROBE, CO 8140Y DURANGO, CO 81301 (aro)z4s-ssas (s7a>s4a-slsa (aTO)zsa-soas