2012-06-20_PERMIT FILE - C2010089 (87)

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Operations Ce4logic and Structure Nap" (TC.). Provide a base and contour map of water tables nr pfrxometric surfaces of water In each significant aquifer to he disturbed by mining (Including any aquifer lying less than 70 in below th deepest coal ,scam to he mined) and the. highest undisturbed aquifer in thrj area of operations; perched water table conditions where observed, will, be indicated. Contour intervals will not exceed 2 m ex- ..ept in special instances of steep ground water gradients, and should be presented with an accuracy of 15 percent. Flow lines shall be in indi- cated. (Preparation of this map will require the drilling of observa- tion wells, or piezometer nests cased to ensure reception o water frog only one aquifer during testing and sampling. Ceologi should be obtained when the wells are drilled: see "Ceo10 Leila t a n ".) INC. Detailed Information describing the charact >s\of s" flow aqui- fers shall be obtained from aquifer pumpin_ e e s d i. at least two separate locations in each aquifer local area of opera- tions. Data submitted will include field me s of permeability, transmissivity and the storage coefficients. ore samples will be used to obtain laboratory estimates of pre- and post - mining permeabilities. • Construction details of all wells used in preparing the information will be supplied. Pumping tests conducted in the areas designated by the re- gulatory authority as alluvial valley floor areas shall be designed to identify leakage between alluvial aquifers and deeper aquifers to be dis- turbed by mining (as well as leakage between multiple aquifers that may be disturbed). Locations of recharge to any alluvial valley floors will be identified and their role in the recharge cycle will be identified. All information will be reviewed and approved (as to its accuracy and interpretation) by a second independent and qualified party. IIID. Water Quality Analyses of ground water samples collected (at least twice and not closer together in time than four months), from all wells used in preparing the "Detailed Hydrologic Map of the Area of Operations" shall be submitted. Timing of sample collection will, at a minimum, coincide with seasonal highs and lows in water table or piezometric surfaces. Samples shall represent as closely as possible aquifer water and shall.not be con- taminated by the well casing, cement, or drilling fluids. Analyses may be reduced if sufficient information is submitted to the regulatory authority to permit affirmation of consistency of water quality. Water Quality Analyses will include: PH Parameter specific conductance (mmho /cm at 25 C) turbidity (Jackson units) total alkalinity as CaCO (mg /1) total acidity (mg /I) oil and grease (mg /1) carbonate (mg /1)(meq /1) bicarbonate (mbl)meq /1) Field meter Wheatatone bridge Turbidimeter Procedure Titration; electrometric; manual or automated method -- methyl orange Electrometric end point or phenolphthalein end point Liquid - Liquid extraction with trichlorotrifluoroethane Titration, electrometric; manual or automated method---methyl orange Titration; electromatic; manual or automated method — methyl orange