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.' [_Giry',.7 N999 <br /> G` • • III IIIIII III IIII III <br /> L-, -, Pdtl_SG , FIRLEY, f'AT� Ef sSE?�J and QUIRK, INC. <br /> c urvsu�*.,rv.s 202 CLUBHOUSE QRIVE GREELEY, ('OLORADO 80631 303: -.356.4444 <br /> April 23, 1974 <br /> Mr. Jack Varra <br /> Varra Enterprises <br /> Rt. 2 Box 640 <br /> Broomfield, Colorado 80020 <br /> Dear Jack: <br /> SUBJECT: REPORT OF GRAVEL ANALYSIS , PROJECT NO. 74 1 PLA 0134 <br /> This report includes results of laboratory test and visual observation per- <br /> formed on gravel samples obtained from a proposed gravel mining site. The <br /> site is described as the NW 114 of Section 31 , TIN, R67W, Weld County, Colorado <br /> and contains approximately 156 acres . <br /> The laboratory tests were aimed at determining the value of this deposit as <br /> a construction material source. <br /> GEOLOGICAL DESCRIPTION <br /> Visual examination of the samples obtained from the site revealed a comb- <br /> ination of igneous , metamorphic and sedimentary =k. Igneous -rock is <br /> typified by the presence of quartz, rhyolite, basalt, feldspar and granite. <br /> Metamorphic rock is typified by gneiss and quartzite. Some metamorphosed <br /> sandstone and conglomerates were found in small quantities . Some specimens <br /> of granite were found to be very friable. Granite, quartz and quartzite <br /> were found to be predominate in the samples. <br /> The source of the alluvium appears to be toward the west, in the mountain <br /> above Boulder, and north , above Lyons . Although a complete geologic study <br /> has riot been developed, it appea;-s the gravel was deposited during the <br /> glacial and in.-er-glacial stages in the Rocky Mountain area. During these <br /> stages, cycles of deposition and downcutting by the streams left the terrac! <br /> deposits which are now present in the St. grain Valley. <br /> LABORATORY INVESTIGATION <br /> Laboratory tests were performed on the samples to determine gradation, <br /> specific gravity and soundness . <br /> OFFICEO IN CRFELcy, DENVEq, ::OLO,:?DO SPII1;,,S GRA'.D JIF,Ci'C,. COIOPADO: R VE:;TON, <br />