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Grand Junction Pipe <br />Surficial Geology Investigation, 23 Road Proposed Gravel Pit, Grand Junction, Colorado <br />Febmary 26, 2002 Page 5 <br />GEOLOGIC HAZARDS <br />This site is within the designated 100 Year Flood Plain, shown on the National Flood Insurance Program Maps <br />for Mesa County, Colorado. <br />During the course ofgravel extraction, some steep scopes will be produced. These steepened slopes are temporary <br />in nature and will probably undergo constant modification. It is believed that after the top soils have been <br />stripped from the extraction area, the height of any steepened slopes will be less than 20 feet and will probably <br />be closer to 15 feet. Significant slope stability problems are not anticipated on this site during the extraction <br />process. It is rewmmended that cut or fill slope., above the water table be carefully controlled to avoid localized <br />areas of instability. The slope surface below the water table will tend to flatten quite quickly. The amount of <br />the slopes beneath the water table will depend upon the dewatering process and the amount of dewatering which <br />will have to be accomplished. his our understanding that the specific requirements for slope angles within <br />operating and reclaimed gravel pits will be enforced for this site. <br />No evidence of sigcrificant ground settlement, ground collapse, undermined areas, mass wasting processes (other <br />than the Colorado River flooding) or other geologic hazards are present on this site or which would affect the <br />extraction of the gravel on this site. It is not believed that geologic concerns exist on this site which will affect <br />the final reclamation of the proposed gravel pit. <br />It is believed that all pertinent points, as related to the Geologic Characteristics, which may significantly affect <br />the proposed development, have been addressed. If any further questions arise or if GRAND JUNCTION <br />LINCOLN-DeVORE can be of any further service, please do not hesitate to contact this office at any time. <br />RespecKfully submitted, <br />GRAND JUNCTION <br />LINCOLN-DeVORE, INC. <br />i f <br />by: Edward M. Moms PE <br />Engineering Geologist <br />_ _. ___ <br />~_ . <br />/ ~~ _ <br />Brian M. Killian- <br />Engineering Geologist <br />GJLD Job # 89147-GJ <br />