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<br />1 <br />Grand Junction Pipc <br />Gravel Pit. SE comer oC 23 and River Roads, Grand Junction, CO <br />No+'ember l2, 1997 Page 3 <br />A deeper ground water is present in the underlying rock deposits. This lower ground water is within several <br />confmcd aquifers. Some of these confined water are potable. Information available to Lincoln DeVore, the U.S. <br />Geological Surrey Professional Paper # 451, Geology and Artesian Water Supply, Grand Junction area, <br />Colorado. S.W. Lohman. 1965, provides a drillers log of a wall penetrating some of the confined aquifers. This <br />+ycll is located in the south+vest Quarter of the northwest Quarter oC Section 5, Township 1S, Range l W of the <br />Utc Pnncipal Meridian, approximately 1000 feet north of this tract. Making corrections for topography and the <br />swctural dip of the beds. a sally ground water in the Dakota Formation could be anticipated approximately 300 <br />' feel bclo+v the ground surface, a thin potable aquifer in the Somcn~ille Formation approximately 700 feet below <br />the ground surface and potable +valcr in the Entrada Sandstone approximately 1000 Cect below the ground <br />surface. As can be seen from these depths. the confmcd water strata would be found a[ significant depths and <br />' would be separated from the proposed mineral extraction operation by a least f00 Ice[ of Mancos Shale <br />Formation and an additional 200 feet of Dakota FormaUOn. <br />t SURFACE WATER <br />Surface ++'ater on this tract. resulting Crom storm runoff is expected to be quite small. The construction of the <br />rmlroad and highway embankments north of this silt effectively control stornt runoff from this direction. The <br />existing dram ditches in the area, in combination with Leach Creek to the east and the Appleton Drain to the <br />++cst cffccticcl}' control stornr runoff in this area. )n general, it belicvcd that surface water on this sift ++~ll be <br />mostly generated on site and can be conVOlled on site. <br />ECONOMIC GEOLOGIC DEPOSITS <br />' Thc economic deposit of conscqucncc on this site is the sand and gravel of the Ancient Colorado River Terrace. <br />' surface. contains soluble sulfate salts and other minerals in sufficient quantih that the .vatcr is not considered <br />potable. These waters ma+', m some instances be utilized for irrigation but, are normally considered to hate <br />excessive minerals. The confined waters in the Dakota, Summerville and Entrada Formations arc gcncralh <br />considered of minor conscqucncc in this arcs as the areas is serviced by the City of Grand Junction and the Utc <br />Walcr Consenancv District distribution systems. It is not belicvcd this proposed gravel extraction operation <br />+yould affect, either positively or adversely, these deeper, confined ground waters. <br />This sand and eracel is covered ++ith between 9 to 15 feet of tint grained silty clays and clayey silts overburden. <br />It is possible this o+'crburdcn could be utilized for soil fill and, vvilh organic amendments, could be utilized for <br />' landscaping purposes. <br />The ground ++atcr on this site, which may be cncountcrcd bchvccn 13 l0 16 feet below the presenl ground <br />Some amounts of petroleum and natural gas have been extracted from the Dakota, Burro Can}on and Monson <br />Formations. In generate vcrv little hydrocarbons have been found or extracted in this portion oC the Grand <br />Valley The principal existing and prospected gas and oil fields lie several miles to the north and northwest. It <br />is possible that natural gas deposits arc presenl beneath this site but, exploration and production oC any such <br />deposits should not conflict +vith this proposed gravel extraction operation. <br />Radioactiyc ores have been prospected for and, in some cased mined from the lower Burro Canyon and Morrison <br />Fornations. south of this site. In general, the principal radioactive ores have bcen produced from the <br />1 <br />