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Brown <br />Page 2 <br />June 9, 2000 <br />S2W-FG3. This has been approved in the Seneca II-W PAP. The Division recommends that <br />SCC submit the revised analysis presented in the 1999 AHR for approval with the upcoming <br />permit renewal application. <br />5. On page 10 of the AHR (in reference to the groundwater standard for manganese), SCC <br />states that "the CDOH standard of 0.2 mg/1 is used to protect crops grown in soils with a pH <br />value lower than 6.0. In soils with a higher pH (as are found in the Seneca II-W region), a more <br />appropriate standard would be l0 mg/1. (EPA, 1976)." As discussed with SCC during the Seneca <br />II Mine 1999 AHR review, the Division could not find a CDPHE reference in "The Basic <br />Standards for Groundwater" regarding this statement. The appropriate agricultural standard for <br />manganese in groundwater is 0.2 mgJl. <br />If you have any questions concerning my review of the 1999 AHR, please let me know. <br />m:\coal\mpb\Sen2 W 99ahr <br />