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CHAPTERFIVE Draft EIS Recisions
<br />• TDS concentrations measured in well 20-1 at the Dissolution Surface range from 3,612 to 70,076
<br />mg/l with a mean of 51 900 mg/l. Mean concentrations of sodium (16,700 mg/I), potassium (114
<br />mg/1~ chloride (11,500 mg/1), and fluoride (30.3 mg/1) are much higher than those for the
<br />alluvium and Upper Aquifer at the site. Mean concentrations of chloride (11,500 mg/1), fluoride
<br />(30.3 mg/I) nitrate and nitrite (18.6 mg/1), azsenic (0.06 mg/1), beryllium (0.01 mg/I), chromium
<br />(0.77 mg/1), iron (6.71 mg/1), lead (0.23 mg/1), lithium (8.53 mg/1), and manganese (0.06 mg/l)
<br />exceed Colorado groundwater standazds. All results for nitrite were non-detect at elevated
<br />detection limits. Based on the EPA method of calculating means, the mean concentration for
<br />nitrite (11.5 mg/1) exceeds the standazd. Other parameters that exceed the standards for well 20-1
<br />aze sulfate in 4 of 18 samples, nickel in 1 of 17 samples, and zinc in 4 of 17 samples.
<br />Water quality information for the Lower Aquifer from WRN operations is summarized in Table
<br />3.4-4. TDS values at the B-Groove range from 780 to 1,484 mg/I, whereas those at the
<br />Dissolution Surface range from 1,708 to 27,670 mg/1 at the WRN site, about 2 miles west of the
<br />Piceance Site.
<br />Concentrations of the other constituents reported for the WRN Lower Aquifer wells aze generally
<br />lower than those for the American Soda samples. However, the data provided by WRN includes
<br />zeros for the minimum values for many analytes instead of recording them as less than the
<br />applicable detection limit. This has the effect of biasing the mean concentrations lower. Mean
<br />concentrations for the American Soda data were determined by using one-half the detection limit
<br />for all non-detect analyses.
<br />
<br />wells completed in the Lower Aquifer from the USGS
<br />uized in Table 3.4-3. TDS concentrations for these
<br />from 611
<br />to 2,180 mg/I. Mean concentrations of sulfate (355 mgft), fluoride (7.92 mgfl), and TDS (1,140
<br />mg/l) exceed Colorado groundwater standazds. However, the depth or screened interval that was
<br />monitored by these wells is not known.
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<br />3.4.2.2 Pipeline Corridor
<br />The project pipelines (product and water return lines) would be routed along an approximately
<br />44-mile-long corridor, much of which parallels existing pipeline rights-of--way. The pipelines
<br />. would traverse a variety of surficial geologic materials including alluvium, colluvium, and
<br />bedrock. The pipelines would be buried approximately three feet below grade.
<br />5-15
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