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GENERAL34193
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Last modified
8/24/2016 7:55:48 PM
Creation date
11/23/2007 7:50:28 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2000158
IBM Index Class Name
General Documents
Doc Date
12/7/2005
Doc Name
Slurry Wall Design Packet
From
Environment Inc.
To
DMG
Permit Index Doc Type
General Correspondence
Media Type
D
Archive
No
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SECTIONFOUR Subsurface conditions <br />4.1 GENERAL GEOLOGY <br />The Sharkey's Lake Gravel Pit is located east of the Front Range, within the Denver structural <br />basin. Bedrock near the site is covered by Pleistocene Age (less than 2 million years old) <br />Louviers Alluvium and Holocene Age (less than 8,000 yeazs old) Post-Piney Creek Alluvium. <br />Louviers Alluvium in this region typically ranges in thickness from 20 to 40 feet and generally <br />consists of sands, gravels, and cobbles with occasional lenses of silt and clay. Louviers <br />Alluvium is typically covered by less than 5 feet of Post-Piney Creek Alluvium consisting <br />mostly of silty clay and clayey sands. <br />Bedrock in the area of the site generally consists of the Denver Formation. This bedrock unit is <br />late Cretaceous to early tertiary in age (about 65 million yeazs old). The formation consists <br />mostly of interbedded and interlensed sandstones, siltstones, and claystones. The bedrock strata <br />are generally deposits of compaction rather than cementation. Typically, the claystones consist <br />ofover-consolidated clays and the siltstones and sandstones consist of dense, but generally <br />uncemented to weakly cemented, silts and sands respectively. <br />4.2 SUBSURFACE CONDITIONS <br />The general subsurface profile at the site consists of topsoil over alluvial soils, with alluvial soils <br />over bedrock. Descriptions of materials encountered in the borings are presented in the <br />following sections, starting from the ground surface. Boring logs and test pit logs are presented <br />in Appendix A. <br />4.3 TOP SOIL <br />The topsoil cover ranges from about 1 foot thick to a maximum thickness of approximately 7 feet <br />in TH-16. The topsoil ranges from silty sand with clay to silty clay with some fine sand and <br />medium plasticity. <br />4.4 ALLUVIUM <br />Alluvium was generally encountered at depths beginning from 1 to 7 feet below ground surface <br />and extending from 25 to 45 feet below the ground surface. This stratum contains the primary <br />material to be mined for sand and gravel. The alluvium encountered in the borings varied from <br />silty sands to gravel with little to no fines. The alluvium encountered in the boreholes is <br />typically very loose to dense material, and classified as SM, SW, SW-SP, and GW according to <br />the Unified Soil Classification System (USCS). In TH-15 and TH-16, a layer of silty clay was <br />encountered from 9 to 11 feet and from 20 to 22 feet, respectively, below the ground surface. <br />4.5 BEDROCK <br />Bedrock was encountered at depths of 25 to 45 feet below the existing ground surface. Bedrock <br />identified in the borings is predominantly siltstones and claystones in the 29 test borings, with a <br />weak sandstone layer encountered in 2 of the 29 test borings. The transition between the <br />claystones and siltstones is gradual. The claystone is mostly silty, soft, moist, and gray; while <br />the siltstone is mostly sandy, with clay lenses and is hard, moist and brown. The claystones and <br />I, N*:IPR~OJECw`T$\22238240_PLATTE SAND_GRAVEL\SUB_00\52.0 WORD_PROC\PLATTE SAND&GRAVEL GEOTECHNICAL DESIGN REPORT 4.O DOC\1SNOV-05\\ 4-1 <br />VFW <br />
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