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PERMFILE119279
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PERMFILE119279
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Last modified
8/24/2016 10:15:01 PM
Creation date
11/25/2007 6:48:15 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1984065
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
3.3 Hydrology and Geology
Media Type
D
Archive
No
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Table 3.3-i1. National Drinking Water Standards Exceeded or . <br />Equalled During the Monitoring Program <br /> Observed Date <br />Parameter <br />___ Standard <br />_ Concentration Sampled Sta[ion• <br />_ <br />_____ <br />Selenium _____ <br />___ <br />0.01 _____________ <br />0.01 _________ <br />12/17/01 _________ <br />AC-1 <br />Selenium 0.01 0.02 12/22/02 AC-1 <br />Selenium 0.01 0.02 12/17/81 AC-2 <br />Selenium 0.01 0.02 03/20/82 AC-2 <br />Selenium 0.01 0.02 12/22/82 AC-2 <br />Selenium 0.01 0.01 03/28/83 AC-2 <br />Selenium 0.01 0.02 09/23/83 AC-2 <br />Selenium 0.01 0.01 12/19/83 AC-2 <br />Nitrate 10.0 12.0 12/17181 AC-2 <br />NSt rate 10.0 10.6 03/20/82 AC-2 <br />Nitrate 10.0 11.2 09/23/82 AC-2 <br />Nitrate 10.0 12.0 12/22/82 AC-2 <br />Nitrate 10.0 16.9 03/28/83 AC-2 <br />Nitrate 10.0 12.3 09/21/83 AC-2 <br />Note: All units are Sn mg/1 <br />• AC-1 is Alkali Creek upstream <br />AC-2 is Alkali Creek dovns[ream <br />Selenium frequently equals the CDOH standard (Table 3.3-10). When <br />compared to National Primary Drinking Water Standards, nitrate <br />limits have also been exceeded. Most of these exceedences have <br />occurred at the downstream station, ALK-2, and during low flow <br />conditions. <br />High nitrate levels are attributed to local land use practices. <br />Alkali Creek is used for cattle watering and the adjacent land for <br />grazing. The cattle have direct access to the creek. Nitrate does <br />not appear to be entering from overland flow since observed <br />concentrations are lowest during spring runoff. The nitrate is <br />probably entering the creek by leaching irrigated soil (USGS Water <br />Supply Paper 1473). It has been documented that coal often <br />contains higher than average concentrations of selenium (NAS, <br />1976), suggesting that coals may be the source of selenium found in <br />the Alkali Creek waters. <br />Figure 3.3-16 is a trilinear diagram showing the type of water and <br />the major ionic composition of Alkali Creek water. The figure <br />indicates that there are no dominant ions in the water. The major <br />anions consist of bicarbonate (HC03) and sulfate (S0,), in almost • <br />NCEC - Coal Ridge #1 3-46 ASC/1145/900301 <br />
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