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Seneca II-W, 1999 AHR <br />Page 2 <br />June 9, 2000 <br />Creek utilizes data from Site SW-S2W-FG3. This has been approved in the Seneca II-W <br />PAP. The Division recommends that SCC submit the revised analysis presented in the <br />1999 AHR for approval with the upcoming permit renewal application. <br />5. On page l0 of the AHR (in reference to the groundwater standard for manganese), <br />SCC states that "the CDOH standard of 0.2 mg/I is used to protect crops grown in soils <br />with a pH value lower than 6.0. In soils with a higher pH (as are found in the Seneca II- <br />W region), a more appropriate standard would be ]0 mgll. (EPA, 1976)" As discussed <br />with SCC during the Seneca II Mine 1999 AHR review, the Division could not find a <br />CDPHE reference in "The Basic Standards for Groundwater" regarding this statement. <br />The appropriate agricultural standard for manganese in groundwater is 0.2 mg/I. Please <br />clarify this standard in next year's AHR. <br />If you have any questions regarding this letter, please contact either Mike Boulay or <br />myself. <br />Sincerely, <br /> <br />Sandra L. Brown <br />Environmental Protection Specialist <br />