My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
GENERAL32494
DRMS
>
Back File Migration
>
General Documents
>
GENERAL32494
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 7:55:01 PM
Creation date
11/23/2007 7:19:47 AM
Metadata
Fields
Template:
DRMS Permit Index
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
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
128
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
L <br />15 <br /> <br /> Geology <br /> The quarry site and surroundings are on the Precambrian Idaho Springs <br /> Formation, mainly schists, gneiss and granite. The Idaho Springs bedrock <br /> is overlain by a thin layer of colluvium through which the bedrocks protrude <br /> in many places. A narrow strip of Quaternary alluvium lines the `.train <br />' Gulch water course. <br /> The entrance road crosses Jurassic sedimentary formations for about <br />' 1/4 mile. <br /> Nature of Impacts <br />' On Site <br />' The objective of the whole operation is to remove and utilize geological <br />bedrocks. In doing this the surficial colluvium is moved. About 60 acres <br /> of existing landfornr is or will be changed from a steep, deeply incised <br /> hillside to a pit with steep walls on two or three sides. As noted in Table 1, <br />' these changes are permanent and irreversible, <br /> Construction of haul and service roads moved surficial materials from a <br /> total of about 2 1/3 acres of hillside. As noted in Table 1, these changes <br />' will be permanent unless corrected. Correction would mean ripping the road <br /> surfaces and pulling the fill materials back into the cuts. We c<rnnot forsee <br /> in 1975 what may happen to the roads 40 or 50 years in the future. <br />' <br /> The Precambrian Idaho Springs formation of most]y metamorphosed racks <br /> contain no paleontological remains. <br />' Gff Site <br />' All the bedrock material that is hauled away will be deposited, or• used, <br />off site to surface roads or other places where vehicular or foot traffic is <br /> heavy. Such use can contribute damage to the natural environment by <br /> covering soil, hindering vegetal growth, etc. But traffic without surfacing <br />' could be equally or more damaging. Improvement in the human environment is <br /> considered to outweigh damages to the natural environment. The changes <br /> will, in a practical sense, be mostly permanent and irreversible. A <br /> +4 rating was therefore assigned as an off-site impact for "Bedroc:k and <br />' Iinerals," under "Hauling," Table 1. <br /> Future Impacts <br />' <br /> The greatest impacts on land form and surficial materials have already <br /> been experienced, but moderate changes still lie ahead. An estimated <br /> 10 to 18 additional acres of surface are scheduled for the final quarry. <br />' Future operations will be mostly downward. All foreseeable roads have <br /> been built. <br />' Bedrock and accompanying minerals will continue to be removed from <br />the site and deposited off site. That means that the impacts on bedrock, <br />both on site and off site will continue as long as the operation continues. <br />1 <br />1 <br />
The URL can be used to link to this page
Your browser does not support the video tag.