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<br /> <br />• D. <br />(5) Groundwater: At the time of the investigation, free ground- <br />water was encountered at depths of two and one-half (2 ;} to <br />seven (7) feet below the surface. Water levels in this area <br />are subject to change due, to seasonal variations, irriy~rtion <br />demands on the site and t~e volume of flow in the Cache la <br />I'oudre River. <br />DISCUSSION <br /> <br /> <br />Test drilling vras concentrated in two (2) areas, one in the northvrest <br />corner of the property and one in the south portion of thr' site. Two <br />and one-half (2!;) to eleven (11) feet of overburden were cncountcrerl <br />above the gravel in these two areas of the site. The averar.le thickness <br />of the overburden in these areas is five and one-half (5=z) feet. The <br />average thickness of the gravel layer in the two (2) areas is nine and <br />one-half (9',) feet and approximately five and one-half million cubic <br />yards of gravel were encountered in the two areas where the test borings <br />were drilled. Additional gravel should be encountered in the areas that <br />were not tested. <br />The gravel consists of hard, durable fragments composed mostly of <br />quartz, granitic and metamorphic rock fragments. There appears to be <br />sufficient quantities of cobbles within the gravel stratum that can be <br />crushed and screened along with the gravel to produce concrete and <br />asphalt agyregate, road base material and other construction materials. <br />GENERAL COMMENTS <br />The quantities of gravel and amount of overburden submitted in <br />this report are based upon the data obtained from the soil borings <br />performed at the locations indicated on the Test Eioring Location Plan. <br />This report does not reflect any variations which may occur between these <br />borinys. The nature and extent of variations between the borings may <br />not become evident until the quarry operation is underway. <br />-3- <br />