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Gary Rinderle Construction GraveUAggregate Resources, May 4, 2001 High Desert AFT Subdivision, Page 3 As can be seen from this general log, the gravel.resource is present across much of the tract, but the difficulty of extraction is variable. The amount of overburden will probably determine what gravels are extracted. The gravel and cobble resources to the west of 35 Road are somewhat sporadic, with variable amounts of over burden soils. The gravel and cobble is generally limited to the higher elevations of Lots 1, 2 and 6. The gravel deposits on lots 4, 5 and probably the higher elevations of lot 7 are probably thicker and more consistent in quality. The actual amount of recoverable resources west of 35 Road may be somewhat limited but, could be very useful for subdivision improvements. The recoverable resources on Lots 7, 8 and 9 aze fairly thick but, the higher elevations, particularly the east half of Lot 7, the west half of Lot 8, on the uplands area above the plotted 2.5:1 setback line will have relatively thick deposits of over burden. The major building area of Lot 9, above the 2.5:1 setback line appears to have at least 10 and possibly up to 40 feet of over burden. The amount of gravel resources which can be economically recovered from these lots may be somewhat limited. Several surface exposures in the gullies to the south and east of the building envelopes indicates the gravel and cobble may be up to 20 feet thick. The presence of the steep slopes along the south and southeast portion of Lots 7, 8, 9, and the existing residence south of D 1/4 Road extension and east of 35 Road will limit the amount of extraction which can take place. The steep slopes and the presence of the residence partially enclosed by this tract will place restrictions on complete aggregate removal. An additional concern may be the orchard operations to the north The presence of the orchards to the north may limit the amount of activity on this site, as both gravel extraction and crushing operations may produce excessive dust. Adequate wetting of the aggregate materials may be possible for dust suppression. A¢ere¢ate Oualiri: These aggregates are composed of sandy gravels and cobbles of the Ancient Colorado River Terrace. In general, most of these aggregates are derived from granitic type rock. This terrace deposit is noted for significant amounts of pale yellow siltstone and other sedimentary rock fragments which can be found throughout this deposit. These siltstones and other sedimentary rocks are friable (relatively easily broken, often times with finger pressure), thus restricting these aggregatcs from use in concrete and asphalt. Grandlunction Lincoln DeVore personnel collected samples of the sandy gravel and cobble from a exploration pit on the west side of Lot 7. One of these samples was subjected to a Gradation Analysis ASTM C-136 and a Maximum Density ASTM D-698 (Proctor) Test was conducted on another sample, which was limited to the minus 3/4 inch sizes. These aggregates have proven to be excellent for use as structural fill, road subbase material and, if the specifications will allow the friable materials, for crushed road base. The amount of fine material (small than the #200 sieve) often times exceeds spec cations for some subbase and most aggregate road base materials, but similar material from existing gavel pits in the Orchard Mesa and East Orchard Mesa areas has proven to be stable and has performed quite well as road subbase and aggregate road base.