PERMFILE118117

• Permit No: M1980183
• IBM Index Class Name: Permit File
• Doc Name: WELL LOCATION AND RESOURCE MAP PAGE 10 OF 23
• Media Type: M
• Archive: No

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Stream Terrace deposits - Flood Plain deposits -
Lid@ GRAVEL: Relatively clean @ GRAVEL: Relatively Uoch OF INFORMALON Adapted fro74,
y f 1 chwochow, R.R. Shroda and BC. Wickein, 1974,
and sound. clean and BOUIId. Atlas of Sand, Gravel and Quarry Aggregate
Resources Colorado Front Range Counties: Colorado
Efat Stream Terrace deposits — 6 Geological Survey,Special Publication 5 -8
3 SAND Geologic Contact, eSWI eltt aEa'ta�y
@t Stream Terrace deposits - � approximately located.
4 Possible aggregate resource.
GEOLOGY SITE GEOLOGY channelyvays are common due to the shifting of the
GENERAL GEOLOGY The gravel deposits of the MCA 29 property comprise South Ratte River throughout geologic time. This
Stratigraphically, the bedrock underlying the two distinct deposits. The majority of the site is stream shifting has left varying depths and lateral
property at MCA 29 is the Denver formation of Late underlain by stream terrace deposits composed of extents of the gravel deposits within the flood plain,
Cretaceous age. It forms the bedrock under the reddish to yellowish brown arkosic sand, coarse as depicted on the Bedrock Contour Map, p.11,
surficial alluvial deposits and is the youngest sand, cobble size gravel and occasional boulders. The Geologic Cross - Sections, R13 -14, and Thickness of
consolidated formation found at or near the surface remaining area is underlain by flood plain or valley- Commercial Gravels Map, p.12 .
of the metropolitan area. The Denver formation fill deposits consisting of water deposited gravel,
feet. The sand, silt and clayas shown on this Surficial Geologic
generally has a thickness of 700 a er
formation iscomposedofa heterogeneous mixtureof Map. PAST AND PRESENT MINING ACTIVITIES
sandstones, claystones and conglomerates loosely Well developed organic topsoil varies both laterally There is evidence of past mining activities on the land
cemented and deposited in many lenses resulting in and vertically across the site but is expected to have intended for gravel extraction, as indicated by two
a rapidly changing lithology from one area to another. an average depth of 2 feet to 21h feet. As can be seen small repressed area; one along the east central
It is most frequently recognized from core drilling by by the Logs of Test Holes, p.15, topsoil ranges in edge of Parcel A, comprising about 10 surface acres,
thickness from near zero to a maximum thickness of and one along its unweathered blue to bluish gray color and g the northwest portions of Parcel B,
claystone content. The claystone consists mainly of 7 feet. comprising approximately 2 surface areas. In
montmorillonite with some illite and, therefore, has a The isopach map titled Thickness of Commercial addition, historic gravel extractions have occured
very low permeability. The claystone weathers Gravels, p.12, shows a depth configuration of those approximately 1/4 mile north of the proposed pit.
moderately slowly to a depth of two to three feet. It is gravels. The thickness of the overall deposit ranges These small pits were reportedly operated by the
not uncommon to encounter localized sandstone from approximately 10 feet along the extreme south Colorado Division of Highways. Many other gravel
lenses within the Denver formation of predominantly of Parcel A of the property to about 65 feet near the operations have occured in the South Platte- River
volcanic origin. These sandstone lenses weather middle section of Parcel A. The thickness of the deposits throughout its length. Mineral resource
even more slowly than the claystone. Overlying the deposit ranges from about 10 feet along the recovery will not, therefore, be unique to the area.
Denver formation are alluvial gravels of Pleistocene northwestern perimeter of Parcel B to 45 feet near
to Recent age. the central portion of Parcel B. The Bedrock Contour
The project area is topographically 10 to 30 feet Map ,Rll along with the Geologic Cross- Sections, p. BLATCHLEY ASSOCIATES, INC.
higher than the South Platte River, which is located 13show the top configuration of the Denver formation. Consulting water Engineers
approximately 1/4 mile to the west of the property Although the bedrock surface in the project area
boundary. generally slopes toward the South Platte River (west),
local bedrock surface undulations and ancient
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Class: O Report 0 Hydro OGeneml
Doc Type:
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DApplication (Coal only) 0 Bond 0 Enforcement 0 Inspection
THE BRANNAN SAND & GRAVEL =CO.
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WELL LOCAT[C"'c'
RESCWRICE MAP
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