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Table 2 shows the current constituents included in the ground-water monitoring program. Table 2 -Ground Water Sampling Parameter List Aluminum, dissolved Silica, dissolved Hardness as CaCO3 Antimon ,dissolved Silver; dissolved Nitrate as N, dissolved Arsenic, dissolved Sodium, dissolved Nitrate/Nitrite as N, dissolved Barium, dissolved Strontium, dissolved Nitrite as N, dissolved Be Ilium, dissolved Thallium, dissolved H lab Boron, dissolved Uranium, dissolved Phos horns, dissolved Cadmium, dissolved Vanadium, dissolved Phosphorus, ortho dissolved Calcium, dissolved Zinc, dissolved Residue, Filterable (TDS) @ 180C Chromium, dissolved Alkalinity as CaCO3 Sodium Absorption Ratio in Water Cobalt, dissolved Bicarb as CaCO3 Sulfate Co er, dissolved Carbonate as CaCO3 Sulfide as S Iron, dissolved H droxide as CaCO3 TDS calculated Lead, dissolved Total Alkalini TDS ratio Lithium, dissolved Bromide Tem rature field Magnesium, dissolved Carbon, dissolved organic Gross Alpha Result (pCi/L) Man anese, dissolved Cation-Anion Balance % Gross AI ha Error Ci/L Mercury, dissolved Sum of Anions Alpha Minimum Detectable Activi Ci/L Mol bdenum, dissolved Sum of Cations Gross Beta Result Ci/L Nickel, dissolved Chloride Gross Beta Error Ci/L Potassium, dissolved Fluoride Beta Minimum Detectable Activi Ci/L Selenium, dissolved Conductivi 25C Table 3 summarizes the wells, constituents, and frequency of sampling proposed for the period during temporary suspension of production operations. Operations at the Yankee Gulch Project maybe temporarily suspended. Proposed revisions to the monitoring plan address both periods of temporary cessation and normal operating conditions. During the temporary suspension time period, water levels and water quality sampling would be completed once per quarter for each sampling location at Yankee Gulch and once per yeaz for the domestic well located off site from Yankee Gulch. These level measurements would be made in conjunction with the water quality sample collection. No production solution mines would be in operation and no brine solution would be circulating in the wells or the pipelines. All stand-by status production wells that are not plugged and abandoned would be at ambient temperature and pressure with cast-iron bridge plugs or cement basket plugs set. The constituent list would include the seventeen laboratory parameters and four field measurements specified in the bottom portion of Table 3 and Table 4. Table 4 summarizes the proposed commercial production monitoring plan. During commercial operation water levels will be monitored: continuously using water level probes at dissolution surface monitoring sites, and monthly with a manual measuring device at all other locations. Information provided from the first five yeazs of operation indicates that water level monitoring is the best primary Drag Addendum to SOB For Modification No. 9, LTIC Area Permit No. CO30858-00000 Page 17 of27