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Section 779.21 (a) Continued. <br />• (1976) found a range from 0.2 to 8.6 percent calcium carbonate with <br />an average of 1.79 percent. Berg (1973) reported no reaction for <br />calcium carbonate, Heil (1978) found '_ime to be low on 13 of 14 <br />samples tested. Only one sampled moderate in reaction to acid. <br />Using the Wyoming DEQ standards, soils within the permit area are <br />rated as "good" for top soiling materials with respect to the calcium <br />carbonate parameter. <br />Selenium. The only selenium testing done in the permit area is <br />that of Heil (1976) who sampled Energy Pline No. 1. Examination of <br />the data in T<.ble 74, Total Mehl Content of Soil Horizons Sampled <br />by Heil (1976) indicates total selenium values range from 0.04 ppm <br />to 0.41 ppm with an average of 0.16 ppm. Heil reports that of the <br />sues sampled throughout northwest Colorado, the highest selenium <br />value encountered did not exceed 0.85 ppm. Using the Wyoming DEQ <br />• standards fur soil materials, the soils in the permit area are <br />rated a~ "good" with respect to selenium. Gough and Shacklette <br />(1976) report no potential problems of soils with such low selenium <br />levels. Standards used by the Department of State Lands in Montana <br />(Dollhopf, et. al. 1977) indicate that values greater than 2.0 ppm <br />are needed before the suspect level is reached for this element. <br />Boron. The only testing for boron done on the permit area is that <br />of Heil (1976) who sampled sites on Erergy Mine No. 1 as demon- <br />strated in Table 76, Soil IQutrient Properties of Soil Horizons <br />Sampled by Heil (1976), boron values ranged from 0.03 to 0.65 ppm <br />with an average of 0.33 ppm boron. Heil (1976) also reported that <br />99 percent of the samples taken in northwest Colorado contained <br />less than 2 ppm boron. Using the Wyoming DEQ Standards for suil <br />rating, the soils are rated as "good" with respect to boron. <br />Richards (1969) states that concentrations of less than 0.7 ppm <br />boron are safe to even boron sensitive plants. Gough and Shacklette <br />• (1976) state that toxicity does not become a problem unless values <br />exceed 2 ppm boron in the soil. <br />779-294 <br />