Geologic And Hydrologic Factors Governing ... - Gunnison County

Geologic And Hydrologic Factors Governing Impacts Of Development
On The Crystal River Near Marble, Colorado
Gunnison County, Colorado
can be done to overcome these constraints by either private individuals or government ac-
tions.
8. Applicants for building permits on tracts lying within stability classes III, IV and V on the
Slope Stability Map; within areas having excessive flood and avalanches hazards; or the geo-
logic hazard zones shown on the Engineering Geologic Map by Rogers and Rold (1972)
should be required to conduct a site-specific floodplain and geologic investigation which
would be reviewed by the CGS.
9. The soils and geologic data indicate that significant portions of the study area are infeasible
for septic tank and leaching field construction. Even with detailed site investigations, many
of these tracts will not be built upon.
10. Septic tank leaching systems should not be constructed on parcels of less than 1 acre in size.
11. Gunnison County present ISDS regulations, if strictly applied, will be adequate to safeguard
the water quality and health of the community when utilized with the data in this report.
Without strict application of the regulations and without relying on the report data and find-
ings, the Ski Area Filings will cause a degeneration of the area and private and public costs.
12. Due to road width, traction limitations, grade, geologic, and geotechnical constraints, the ex-
isting narrow, unsurfaced access roads, particularly Serpentine Drive and the road between
Slate Creek and Carbonate Creek, are not suitable for general public use. Widening, surfac-
ing and bringing the main access roads up to county standards would be relatively difficult
and expensive and would require higher and extended cut slopes, wider fills, and careful
drainage control. Upgrading the roads would likely cause increased instability and landslide
problems on steeper slopes.
13. Geotechnical constraints related to landslides would create hazards to utility pipelines due to
potential settlement and fracturing at vertical displacements. Field inspections showed
scarps in roadways which would cause shearing of water and sewer lines. Settlement of land
951-110.000 Wright Water Engineers, Inc. Page 64