GENERAL54338

• Permit No: M1980110
• IBM Index Class Name: General Documents
• Doc Name: EXHIBIT I AND J SOILS AND VEGETATION INFORMATION
• Media Type: D
• Archive: No

INTRODUCTION

This report presents the results of a preliminary investigation of
the potential sand and gravel aggregates on a 41 acre tract of land in
the Northeast 1/4 of the Southwest 1/4 of Section 26 and the Northwest
1/4 of the Southwest 1/4 of Section 25, Township 1 South, Range 67 West
in Adams County, Colorado. Sand and gravel were found Sn all five test
holes on the property. The results presented in this report are based
on a review of appropriate literature, a drilling investigation, an Los
Angeles abrasion test, and mechanical analyses of samples collected on
the property.
SITE GEOLOGY
Bedrock under the site is the Denver Formation (Paleocene and Upper
Cretaceous) and consists of claystone, silt stone, sandstone, and con-
glomerate composed primarily of altered volcanic debris. Bedrock is
covered over the entire site by surflcial deposits. Surficial deposits
a
across the site consist of deposits of Post-Piney Creek, Piney Creek, and
Broadway Alluviums (see Geologic Map, Figure 1), which are the sources
for the sand and gravel on the site. The Post-Piney Creek and Piney
Creek Alluviums (Upper Holocene) are composed of gravel, sand, silt, and
clay. The material is derived from modern stream flood plains and slight-
ly older low terraces less than 20 feet above present stream level. The
Broadway Alluvium (Upper Pleistocene) covers approximately three-fourths
of the property and consists of gravel, sand, silt, and clay. This material
forms alluvial terrace deposits commonly 2 to 4 feet above present stream
level. The combined average thickness for all the alluvial deposits is
approximately 45 feet.
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