My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
GENERAL43250
DRMS
>
Back File Migration
>
General Documents
>
GENERAL43250
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 8:12:03 PM
Creation date
11/23/2007 12:16:51 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1999002
IBM Index Class Name
General Documents
Doc Date
9/13/1999
Doc Name
Final Environmental Impact Statement
From
Rio Blanco County
To
BLM
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.
/
19
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
the results of that model and the flow and transport model of Robson and <br />Saulnier (1981) both indicated that the potentiometric surface shows flow from <br />both alluvial and bedrock aquifers toward Piceance Creek. The groundwater <br />quality in the Piceance Creek alluvium varies from relatively fresh water in the <br />headwaters of Piceance Creek to mildly brackish near the mouth of Piceance <br />Creek, before its confluence with White River. The dissolved solids <br />concentration in Piceance Creek alluvium increases from upstream to <br />downstream and the average dissolved-solids concentration is 1750 mg/L <br />(Robson and Saulnier, 1981). The quality of alluvial groundwater is affected by <br />the following processes. <br />• ANuvial inflow occurs from springs which discharge near the mouth of several <br />tributary streams such as Willow Creek, Hunter Creek, Stewart Gulch, and <br />Ryan Gulch. The specific conductance of spring discharge from these <br />springs increases from 500 to 800 µS/cm to 1200 to 1500 µS/cm, from south <br />to north along Piceance Creek valley. <br />Water-sample analyses from alluvial wells in the Piceance Creek alluvium <br />indicate that groundwater quality can be high in dissolved sulfate which <br />appears to result from a combination of groundwater discharge from the <br />Uinta Formation and slow groundwater velocities. Well P-73-4 near the <br />mouth of Horse Draw has alluvial groundwater with adissolved-solids <br />concentration of 6710 mg/L (Saulnier, 1978). However, this well is near the <br />site of a former Shell Oil Co. facility and may have been contaminated by <br />experimental mining operations in the early 1970s. <br />Natural groundwater discharge along bedrock fractures can contribute saline <br />groundwater to the alluvium, especially in the lower reaches of Piceance <br />Creek in the area near Alkali Flat and Stinking Spring in lower Yellow Creek <br />where specific conductivities of greater than 10,000 µS/cm may be observed <br />in natural spring discharge (Saulnier, 1978). <br />Manmade disturbances have caused contamination of the alluvial <br />groundwater in areas where poorly completed exploration wells have flowed <br />saline groundwater at or near ground surface as observed in Alkali Flat on <br />Lower Piceance Creek (Saulnier, 1978). <br />Alluvial boreholes drilled by the USGS indicate that locally, the Piceance <br />Creek alluvium contain dense organic-rich clay (Welder, 1987). These clay <br />beds may have developed upstream of natural dams developed along <br />Piceance Creek due to the periodic flash floods and debris flows which occur <br />in Piceance Creek Basin (Saulnier, 1978). Stagnant groundwater occurring <br />in this clay-rich alluvium may have higher concentrations of dissolved solids <br />derived from these organic clays. <br />Sentem6er 7. 1999 2 <br />
The URL can be used to link to this page
Your browser does not support the video tag.