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4 <br />Zinc (Zn) concentrations vary slightly between overburden located in the western <br />portion (1-15 ppm) and eastern portion (2-26 ppm) of the proposed permit area. <br />Both areas are well below the level of Zn considered unsuitable for plant growth <br />(Workman, 1980). Soil surface and subsurface concentrations of Zn are also very <br />low (<0.5 to 6 ppm)(Table 2.7-6). Zn is not expected to present any problem for <br />plant establishment. <br />Boron concentration in the overburden samples (Table 2.7-8) did not exceed the <br />desirablemaximum of 5 ppm after weathering (Wyo. DEQ Guidelines, 1976). There- <br />fore boron toxicity is not expected to occur in using overburden materials as a <br />growth medium for plants. <br />The parameters analyzed indicate that no properties are present that would <br />adversely affect plant growth with the possible exception of ESP if the overbur- <br />den were used as the sole plant growth medium. However, as mentioned earlier, <br />all overburden will be retopsoiled thereby reducing the chance of any adverse <br />affect upon plant growth that the overburden could exert. <br />2-391 <br />SEP 21932 <br />