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<br />J <br />Grand Junction Pipe <br />Gravel Pit. SE comer of 23 and River Roads, Grand Junction, CO <br />November 12. 1997 page 4 <br />' Uncompahgre Uplift, south of Unaweep Canyon, approximately 20 miles south of this site. It is not krro+vn if <br />i ant such radioactive ores are present beneath this Vact. Due to the depths of these formations, in excess oC 300 <br />feet bclo+v the ground sutiace, it is not believed if any deposits aze determined to exist, whether such deposits <br />' ~+ould be economical. <br />GEOLOGIC HAZARDS <br />The existing flood plain of the Colorado River is the principal geologic hazard which would affect this site. <br />' Dunng the course of gravel extraction, some steep slopes +vill be produced. These steepened slopes are <br />temporan in nature and ++ill probably undergo constant modification. it is believed that after the top soils have <br />been stripped from the extraction area, the height oC any slecpencd slopes will be less than 20 feet and will <br />probaby be closer to I S feet. Significant slope stability problems arc not anticipated on this silt during the <br />extraction process. It is recommended that cut or Crll slopes above the water table be carefully controlled to avoid <br />localized areas of instability. The slope surface below the water table +vill tend to flatten quite quickly. The <br />amount of the slopes beneath the water table will depend upon the dcwatering process and the amount oC <br />dc+vatering+vhich ++ill have to be accomplished. It is our understanding that the specific requirements for slope <br />angles +vithin opcraling and reclaimed gravel pits will be enforced for this site. <br />No evidence of significant ground settlement, ground collapse, undermined areas, masked wasting processes <br />lothcr Ulan the Colorado River flooding) or other geologic hazards arc present on this site or which would affect <br />the extraction of the gravel on this site. [l is not believed that geologic concerns exist on this site which will <br />' affect the final reclamation of the proposed gravel pit. <br />It is believed that all pertinent points have been addressed. If any further questions arise or if GRAND <br />JUNCTION L[NCOLN-DeVORE can be of any further sen~ice, please do not hesitate to contact this office at <br />any time. <br />Rcspcctfull}'submittcd, ~~ FiECI ~~ <br />f ttP~~•........ ;S%F; ~~. <br />GRANDIUNCTION ~' <br />V;_ ,i ~I <br />LINCOLN-DeVORE, [NC. <br />s !''" 3G`9~ Jam.: <br />~~~~ ~~;. <br />by: Edward M. Moms PE J'~'tt'-~ - <br />••-__,_ <br />Engineering Geologist <br />' GJLD Job H 8G45G-GJ <br />L <br /> <br />