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Gary Rinderle Construction <br />GraveUAggregate Resources, High Desert AFT Subdivision, <br />May 4, 2001 Page 2 <br />which are a product of an Alluvial fan feature which originates on the West-facing slopes of the Grand <br />Mesa. Over most of this tract, the fine grained surface soils are deposited over the medium dense gravels and <br />cobbles of the Ancient Colorado River deposit, which is in turn deposited over the dense formational material <br />of the Marcos Shale of Cretaceous Age. The Marcos Shale is described as a thin bedded, drab, light to dark <br />gay marine shale, with thinly interbedded fine grain sandstone and siltstone layers. <br />Ground Water: True ground water in this area is normally encountered at significant depths <br />below the ground surface. Some sandstones beds within the Marcos Shale are known to contain ground <br />water but, under most cvcumstances ground water is contained within the underlying Dakota, Morrison and <br />Wingate Formations. The water-bearing members of these formations are believed to be in excess of 1000 <br />feet below the ground surface on this site. In addition, much of the water contained within these formations <br />is mineralized and often saline. <br />Some perched waters are present on this site, along the gullies of Sink Creek and the associated tributaries. <br />These perched waters are usually mineralized and contain significant amounts of soluble sulfate salts. <br />The potential of perched ground waters developing in the alluvial coarse grained gavels and cobbles, on top <br />of the Marcos Shale Formation, is considered to be very low, until houses are constructed and landscaping is <br />installed. Perched Ground Water is not expected to be a concern during gravel extraction operations. <br />Gravel Resources: Based upon our field mapping and observation of 1 I exploration pit <br />placed across the site on 1-23-0 ] and 5 five other shalbw exploration pits excavated at a later date and <br />observed on 2-21-01. The gravel resources on the 6 building lots to the west of 35 Road is quite sporadic <br />and relatively limited. Following is a listing of the exploration pits by building lots and the approximate <br />gravel thickness encountered. <br />Lot # Gravel Aeereeate Resource <br />1 % feet of over burden over 5 '/: feet gravel and cobble <br />2S %z foot gravel and cobble top soil over 9 '/x feet + plus gravel and cobble <br />2N 4 feet over burden over 1 foot clayey gravel <br />no log <br />%: foot over burden over 9 %x feet + gravel and cobble <br />no gravel <br />2 feet over burden over 8 feet + gravel and cobble <br />I/4 foot over burden over 9 3/4 feet + gravel and cobble <br />no gavel to 10 feet, believed to be deeper than I 0 feet <br />3 feet or more of over burden over 3 feet or more clayey gravel and cobble <br />