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<br />• <br />this gravel. A 1:1 ratio of gravel to overburden is generally not <br />considered economical. <br />Area II comprises the majority of the flood plain area and consists <br />of Borings 3, 4, 5, 7 through 13, and 17. The gravel thickness in this <br />area varies from eleven (11) to eighteen (18) feet and has an average <br />thickness of fourteen (14) feet. The overburden in Area II varies in <br />thickness from one (1) to six (6) feet and averages approximately three <br />and one-half (3-1/2).feet. Approximately two million eight hundred <br />thousand (2,800,000) cubic yards of gravel exist in Area II. Approxi- <br />mately seven hundred thirty thousand (730,000) cubic yards of overburden <br />will have to be removed to obtained this gravel. This is a ratio of <br />gravel to overburden of approximately 4:1 which should be economically <br />favorable. It should be noted that these quantities will be reduced by <br />providing adequate buffer zones along property lines and both banks of <br />the Cache La Poudre River. Since the majority of the gravel encountered <br />is below groundwater, the site will have to be dewatered prior to quarrying <br />operations, or quarrying will have to be done by use of a dragline. <br />The sand, gravel, and cobbles encountered are composed of fragments <br />of igneous and metamorphic rock. This material appears to be sound and <br />durable, and from this visual inspection, it is our opinion that the <br />sand, gravel, and cobbles encountered in the test borings is good quality <br />aggregate suitable for use in construction. We feel that with proper <br />crushing and screening, this material rrould be suitable for use in <br />concrete and asphaltic concrete, base course, and subbase. Without <br />screening, this material may be suitable for use as a pit-run structural <br />fill material, possibly as subbase material, and for other construction <br />uses. <br />Since little or no gravel was encountered in the topographically <br />high area designated in the report as Area III, it is our opinion that <br />this area contains no economic deposits of sand and gravel. <br />U <br />I <br />~._ <br />C- 8 .. <br />