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RULE 4 PERFORMANCE STANDARDS <br />3. Groundwater/Alluvial Grouncwater - Cclowyo currently has two <br />groundwater monitoring wells completed within Streeter Fill, one <br />ai.uvial well completed in the Goodsprin, Creek alluvium up- <br />stream from Streeter Fill, and one alluvial well completed in the <br />Goodspring Creek alluvium at the base of Streeter Fill. Colowyo <br />will conduct monitoring and sampling of the above four wells and <br />will install, monitor, and sample an additional well adjacent to <br />Wilson Creek. The proposed well location is down gradient from <br />the Gossard Loadout and will be completed during the summer of <br />1983. Estimates indicate the free water zone will be at <br />seventeen feet. The proposed well location is shown on Water <br />Monitoring Sites For Permit No. C-019-81 (clap 37) and proposed <br />well completion is shown in Figure 1. <br />In accordance with the Septe:noer 28, 1982 "Proposed <br />Decision and Findings of Compliance For The Colowyo Coal Company <br />Colowyo Mine", all of the wells will be sampled quarterly as <br />listed below. <br />Quarterly Sampling For* <br />a. <br />—PH <br />b. <br />Conductivity at 2500 <br />C. <br />Total Dissolved Solids <br />d. <br />Bicarbonate JHCO3) <br />e. <br />Calcium (Ca*) <br />f. <br />Macnesium (Mg+2) <br />g. <br />Arr.::iia (NH3) <br />h. <br />Nitrate <br />i. <br />Phosphate (PO4-3as P) <br />j. <br />Sodium (Nal <br />k. <br />Sulfate 004) <br />1. <br />Arsenic (As) <br />M. <br />Iron (Fe) <br />n. <br />Lead (Pb) <br />o. <br />Manganese (Mn) <br />p. <br />Mercury (Hg) <br />q. <br />Selenium (Se) <br />r. <br />Zinc <br />S. <br />Water Level <br />Colowyo looks forward to continued cooperation with M.L.R.O. and <br />will consult with M.L.R.O., after the first annual report is submitted, in <br />efforts both tc evaluate the applicability of all parameters chosen and <br />fre.uency of moni_oring in accordance with the September 28, 1982 "Proposed <br />Decision and Findings of Compliance For The Colowyo Coal Company Colowyo <br />Mine"; and identify any peculiar site specific conditions. <br />Upon receipt of the Divisions approval or the new portions of the <br />above monitoring plans, Colowyo will implement the new provisions of the <br />plans. Since the new provisions were contemplated in the September 28, <br />Rule 4 Performance Standards 4-19 Revision Date: 8/28/17 <br />Revision No.: TR -115 <br />