_PERMIT FILE - M1997053 ‎(36)‎

• Permit No: M1997053
• IBM Index Class Name: Permit File
• Section_Exhibit Name: EXHIBIT I SOILS INFORMATION
• Media Type: D
• Archive: No

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Grand Junction Pipe
' Surficial Geology Investigation, Proposed Clifton Water Pit.34& E 1/4 Roads, Clifton, CO
March 24, 1997 Page 3
' Severa]deep ground%valcr sources exhibit beneath this tract. These deeper ground water sources arc w ithin the
Dakota Formation and lo%vcr rock units. This lower ground water is associated with the artesian ground%eater
' s%stem which has been utilized in the Orchard Mesa and Redlands area of Grand Junction. It is not believed that
potable water can be extracted from these lower rock units as, it is believed these deeper waters are saline in this
particular area.
' SURFACE WATER
This tract is within the active flood plain of the Colorado River and is within the designated 100 Year Flood
Plain, as defined on the National Flood Insurance Program Maps for Mesa County, Colorado.
ECONOMIC GEOLOGIC DEPOSITS
' The principal economic deposit in this site and the general area is the sand and gravel which is to be extracted
from the proposed Clifton Water Pit. It is believed that the dcwatcring of the excavation will be required. It is
' believed the lower portions of the gravel deposit may require being mined using excavators or drag lines.
Several formation, fairh deep beneath this site and including the Dakota, Burro Cam on and Morrison Formation
do produce significant amounts of natural gas and some oil in this general area. The producing fields are located
north of this area within the Bookcliffs and %vest of this area on the slopes of Grand Mesa. It is not known if
exploitation for oil and gas has been accomplished in this area. however, any exploration and production of
' natural gas and small amounts of oil would probably not conflict with the proposed gravel extraction operation.
The Burro Canyon and Morrison Formation, which are believed to be in excess of 1000 feel below the present
' ground surface, have produced radioactive orc in the Uncompahgre Uplift area to the southwest of this tract.
It is not known if any such ores are present beneath this tract. It is believed that due to the depth of these
formations. that any such deposits would not be economically extracted.
' GEOLOGIC HAZARDS
The principal geologic hazard associated with this site is the presence of the flood plain of the Colorado River.
' This site is entirely within the mapped. 100 Year Flood Plain of the Colorado River (shown on the National
Flood Insurance Program Maps for Mesa County,Colorado) and this site will undoubtably be affected by flood
flows smaller than the '100 Year' flood..
tDuring the gravcl extraction operation. some tcmporary steepened slopes %rill be produced. It is anticipated the
height of these slopes will be less than 1$ to 20 feel at any given time and significant slope stability problems
' arc not anticipated. It is recommended that cut and fill slopes above the water table be carefully controlled. The
surfaces below the %yatcr table will tend to flatten quite quickly and not anticipated to be of long term concern.
It is our understanding that specific requirements for rather flat slopes within the operating and reclaim gravcl
pit will be enforced for this site.
No areas of significant ground settlement,ground collapse,undermine areas,mass wasting processes (other than
the Colorado Ri%cr flooding)or other geologic hazards arc present which would affect the extraction of gravel
on this site or the final reclamation of the proposed Clifton Water Pit.
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