1997-06-13_HYDROLOGY - M1984049 (3)

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• Hydrologic Monitoring Plan 2 June 13, 1997 TR-05, Environmental Protection Plan Howardsville Mill, Permit No. M-84-049 G2 Located between NW embankment for Lower Tailings Pond and Flood Protection Dike, previously referred to as groundwater well #15. G2 is an existing alluvial well and will be utilized to characterize alluvial water quality after contact with tailings impounded within Lower Tailings Pond. G3 Located between NW embankment of Upper Tailings Pond and Flood Protection Dike, and beyond Pre-law Tailings Pond. G3 is a new monitoring location that will be utilized to characterize alluvial water quality after contact with Upper Tailings Pond and Pre-law Tailings Pond. G4 Located immediately down gradient of Mill Drain Pond, will be utilized to determine integrity of lower liner for the Mill Drain Pond. If the operator can demonstrate that lower liner is intact, G4 will remain as a leak detection site for the Mill Drain Pond. If operator cannot demonstrate that lower liner has not been compromised, appropriate repair and/or replacement will be required. . Relocation of pre-law tailings, currently conducted by SGC, are in close proximity of the Mill Drain Pond. Therefore, operator may not be able to install G4 until completion of pre-law tailings relocation project. Groundwater samples will be analyzed for the following parameters: Nitrate Chromium pH Nitrite Iron Total Dissolved Solids Chloride Lead Electrical Conductivity WAD Cyanide Manganese Hardness Mercury Alkalinity Aluminum Nickel Major cations Arsenic Selenium Major anions Barium Silver SO4 Boron Sodium Ammonia Cadmium Zinc Metals must be analyzed as filtered and dissolved. Pursuant to Mr. Sandell's request, Molybdenum has been deleted from the parameters list. Failure to analyze samples for all required parameters may result in redundant sampling and analysis, and may constitute grounds for enforcement action. Analytical detection limits for groundwater samples must be sufficient to verify compliance with chronic aquatic life, water quality standards. Water quality standards for chronic aquatic life are shown on the attached Table 1 . Failure to analyze at appropriate detection levels will result in redundant sampling and analysis, and may constitute grounds for enforcement action.