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• steep slopes were. approxiriatciy restored. <br />Asaumin~ successful. reclamation of disturbed areas, <br />postminin~ runoff should not be sionifican[1y dif- <br />ferent from premininn conditions, either in volur..e or <br />peak disct:ar~e. Because of the sleep slopes, however, <br />annual runoff could be increased several fold if <br />reclamation cvere less successful than expected. <br />Dissolved solids concentration in runoff from the <br />i respective watersheds caould probably not increase <br />I <br />significantly as a result of minir.o. Sodium and <br />sulfate content is expected to increase, hoc:ever, <br />i <br />,with a corresnondin~ decrease in calcium, magnesium, <br />i <br />and bicarbonate. This change in water chemistry <br />should ha•.•e no significant impact on use of the water <br />j downstream. <br />c. Erosion and Sedi^te~cation <br />~ Regulations ursuant to the Surface Minin Recla,ration <br />~ o P g <br />i <br />~ and Enforcement Act (30 CFR 715.17(x)) limit the total <br />j <br />~ ; suspended solids in runoff from areas disturbed Sy <br />surface mining to 4S mg/I maximum allowable except <br />' j for discharge from a precipitation event larger than <br />, <br />~ 10-year 24-hour rc!urrence interval. The averag_ of <br />{ daily values for 30 consecutive discharge days cannot <br />i <br />~ exceed 30 mg/1. <br />1~6 . <br /> <br />