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GENERAL30229
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Last modified
8/24/2016 7:47:50 PM
Creation date
11/22/2007 10:10:19 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M1999002
IBM Index Class Name
General Documents
Doc Date
1/19/1999
Doc Name
DRAFT ENVIRONMENTAL IMPACT STATEMENT CHAPTER 3
From
STEIGERS CORP
To
DMG
Media Type
D
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No
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<br />CRAPTERTHREE nftected Enuironmem <br />The potentiometric map for the Lower Aquifer shows groundwater elevations and potentiometric <br />contour configurations similar to those of the Upper Aquifer. Horizontal hydraulic gradients in <br />the Lower Aquifer range from 20 to 130 feet per mile, and the flow direction is generally from <br />the southwest to the northeast. The horizontal gradient in the Project Area is estimated to be <br />approximately 25 feet per mile toward the northeast. <br />3.4.1.3 Groundwater Quality <br />Concentrations of total dissolved solids (TDS) in the Upper and Lower Aquifer range from <br />approximately 400 milligrams per liter (mg/1) neaz the basin margins to 40,000 mg/1 in the north- <br />central part of the basin. Increases in TDS with depth also occur within the basin (Robson and <br />Saulnier 1980). These lateral and vertical variations in water quality occur as a result of <br />' geochemical changes taking place along the groundwater flow path from recharge azeas near the <br />basin mazgins to discharge areas along the major streams (e.g., Piceance Creek and Yellow <br />Creek). Figure 3.4-1, showing idealized groundwater flow paths within the basin, indicates the <br />potential for water from the Lower Aquifer, which is typically high in TDS and of poorer quality, <br />to flow upwazd into the Upper Aquifer and ultimately to discharge to creeks. <br />Groundwater in the alluvial aquifers of the basin aze classified as a sodium bicarbonate type, with <br />TDS concentrations ranging from 470 to 6,720 mg/l. Higher TDS levels typically found <br />downstream toward the White River are attributed to imgation water return, groundwater inflow <br />1 from bedrock aquifers, and the concentrating effect of evaporation (Weeks and Welder 1974). <br />Groundwater in the Upper Aquifer is classified as a sodium bicarbonate type, with TDS values <br />for the saturated portion of the Uinta Formation ranging from 550 to 1,060 mg/1 in the Project <br />Area located in the central part of the basin (Robson and Saulnier 1980). TDS values measured <br />for the Parachute Creek Member of the Upper Aquifer range from 610 to 1,900 mg/1 near the <br />basin's center, Based on existing data, groundwater in the upper portion of the Upper Aquifer <br />would be classified by EPA as an underground source of drinking water (USDW) based on water <br />quality data collected by American Soda. <br />Groundwater in the Lower Aquifer is generally classified asodium-bicazbonate-chloride type <br />with TDS concentrations ranging from approximately 600 mg/1 along the basin margins to <br />greater than 45,000 mg/1 in the northern part of the basin. In the Project Area TDS values range <br />from approximately 830 to 9,700 mg/I (Robson and Saulnier 1980). Site evaluation studies for <br />the U.S. Bureau of Mines experimental oil shale mine in Rio Blanco County included one site <br />located in close proximity to the proposed project. TDS iso-concentration maps produced for <br />that study showed similaz TDS values for the Upper and Lower Aquifers similaz to those <br />described by Robson and Saulnier (1980) in the vicinity of the proposed project. Salinity and <br />TDS increase rapidly within the Lower Aquifer as the Dissolution Surface is approached (Welder <br />and Saulnier 1978}. The poor quality of water in the Lower Aquifer indicates that it is not a <br />USDW. <br />3.4.1.4 Groundwater Use <br />A well record search was conducted of the Project Area (Piceance Site, the pipeline corridor, and <br />Pazachute Site) through the Water Well Division of the Colorado Department of Natural <br />Groundwater 3-17 <br />
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