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-14- <br /> TABLE 3: Soil Parameter Concentrations round Toxic to Plants <br /> Suspected Phy totoxic Level <br /> Parameter Chapmanl Montana DSL2 <br /> pH 8.8-9.0 <br /> EC (mmhos/cm 4-6 <br /> aluminum (ppm) 1 -10 <br /> arsenic (ppm) 2-30 <br /> boron (ppm) 0.1 -1 .0 <br /> chromium (ppm) 5-150 <br /> copper (ppm) 100 (each. ) 40 <br /> lead (ppm) 10-200 10-20 <br /> magnesium 90% of exch <br /> r complex <br /> manganese (ppm) 60 <br /> mercury (ppm) 0.4-0.6 <br /> nickel (ppm) 3-70 (exch. ) 1 .0 <br /> zinc (ppm) 40 <br /> Comments: (1 ) Values from Diagnostic Criter`a for Plants and Soils (Chapman, <br /> 1966). Levels are water soluble unless otherwise no-.ed. (2 ) Red <br /> flag values from the Montana Strip and Underground Mining Act <br /> (1979). Levels of aluminum, arsenic, chromium, copper, lead <br /> n i cke i , and zinc are DTP. extrac.a51 e. <br />