2015-12-23_PERMIT FILE - C1982056 (2)

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averaging 673 mg/1 over the period from 1979 to 1993. The average pH value for this Well is 7.98 units for the period 1979 to 1993. Ground water quality in the low sections of Foidel and Middle Creeks, near their confluence, is of calcium - bicarbonate sulfate type. Electric conductivity ranges from 1,010 (Well 008 -AV -2) to 2,120 µmhos (Well 008 -AV- 1) and pH concentration range from 7.3 to 8.2 units. Presently, alluvial ground water from Foidel and Middle Creeks is not utilized within the permit boundary due to relatively poor water quality. (5) Permit applications may comply with the requirements of 2.04.70)(c) and 2.04.7(2)(a) & (b) regarding the seasonal variability of surface and groundwater qualily and quantity without the collection of data covering 12 consecutive months if accurate statistical procedures, approved by the Division, are used to extrapolate from a data base covering a shorter period of time. RESPONSE The information presented and referenced in this permit revision application regarding seasonal variations of water quality and quantity represents over five years of intensive hydrologic data collection for the permit and adjacent areas. The data was collected as part of cooperative and complementary monitoring programs conducted by the US Geological Survey, the USDA Agricultural Research Service (formerly Science and Education Administration), mine employees and consultants, and through independent studies and research by educational institutions, and Federal, and State agencies. The data collection and analytical procedures used to develop the information presented in this document have followed accepted scientific and regulatory standards to assure consistency, accuracy, objectivity. In addition, Annual Hydrology Reports submitted for the years through 2013 provide data representing seasonal variability of water quality. TR13 -83 2.04 -43 11/03/14