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State Reg. <br />Values for aciri-base potential range from -69.6 to +241.3 and • <br />have mean values of +38.0 and +37.0 respectively for the <br />overburden and underburden sections. Tw~alve samples, or 10.7 <br />percent of the total number of overburden samples analyzed, <br />showed significant acidification tendencies. These strata <br />comprise 14.7 to 35.8 percent of the individual overburden <br />core volume (Table 6-6). The acid-basse potential of one <br />• <br />• <br />6-29a Revised 10/1/86 <br />