GENERAL32494

• Permit No: M1973021
• IBM Index Class Name: General Documents
• Doc Name: MORRISON QUARRY OF COOLEY GRAVEL CO AND THE ENVIRONMENT IN TWO PARTS PART 1A REVIEW OF THE 1972
• Media Type: D
• Archive: No

18

it was within the range of other locations in the metropolitan
area. No complaints of fugitive dust have ever been rec;eived.
' (Letter of March 24, 1975 from Kenneth W. Carlson, Colorado
School of Mines to Dale Ream, Cooley Gravel Companyo)
Trucks that haul the crushed rock produce the usual combustion fumes, and
noise, as they travel off-site. This could be the most objectionable of
the atmospheric impacts.
Future Impacts
The air pollution caused by the quarry operation and by hauling will continue
for the duration of the operation. Pollution from road construction is
' ended.
' Recommendations
"
"
are recognized in the metropolitan
Three levels of pollution
episodes
area: "alert," "warning," and "emergency," (Table 2), We suggest that
' all hauling be stopped if metropolitan air pollution reaches the warning
level.
' Soils
The soils belong to the Juget-Rock Outcrop Association, Figure 3. The
soils of this association are described briefly as "cool, shallow, well-
' drained, moderately steep and steep soils and rock outcrop on mountain
slopes." They are soils of ]ow productivity (See Vegetation Section).
t Nature of Impacts
the soils in the quarry area largely lose their identity. A small
amount is stockpiled along the quarry edges, but most gets mixed with other
' fine materials from the quarry and is used for fill material to make the
ramp roads within the quarry. They cannot be re-separated in the future.
The mixing permanently and detrimentally alters the volume, properties and
' productivity of the soil, Table 1.
As reclamation of the pit will require soil, possibly more soil than was
on the site before mining began,the mixtures going into the ramp roads,
' "quarry fines" and "crusher fines," were tested at Colorado State University
Soils Laboratory. The original soil may be part of the quarry fines.
' Characteristics of two samples of quarry fines and one sample of crusher
fines are compared with one sample of soil (0 to 8 inches deep) fr°om the
area in Table 3.
' The natural soil contained only a medium amount of nitrogen. It was low
in zinc and lime and very low in phosphorus. Potassium was satisfactory.
The quarry fines tested proved to be somewhat alkaline and low in
' organic matter, potassium and lime. They were almost devoid of phosphorus.
The crusher fines were similar except the sample tested contained more
' potassium and lime,
!I