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• Considering the above sampling results, the proposed permit compliance limits have been established as not to <br />exceed the worst case conditions of pre-existing water quality seen in the Big 5 Tunnel Discharge: <br />n,.-...:s f?,.......r.,. - r ;.,,;+, no-A ..,, MemAn A, ('nrrPnt Rio 5 Tnnnel nisnhnrue* <br />Metal Limit, UgA <br />micro s/liter Limit mg/l <br />milli s/liter Justification <br />Arsenic, As 10 0.01 Historic Big 5 <br />Barium, Ba 2000 2 Domestic Water Std. <br />Cadmium, Cd 48 0.048 Historic Big 5 <br />Chromium, Cr 100 0.1 Domestic Water Std. <br />Copper, Cu 2960 2.96 Historic Bi 5 <br />Lead, Pb 91 0.091 Historic Big 5 <br />Manganese, Mn 32,200 32.2 Historic Big 5 <br />Mercury, H 2 0.002 Domestic Water Std. <br />Selenium, Se 50 0.05 Domestic Water Std. <br />Silver, A 50 0.05 Domestic Water Std. <br />Zinc, Zn 9770 9.77 Historic Big 5 <br />*Note: It is necessary to apply a dilution factor of 1:3 to lab analysis of pilot plant sampies in order w correiato inc <br />data to proposed Mobile Mill operations. Refer to the explanation in the attached Waste Stream Characterization. <br />Based on the pre-existing, baseline quality established above, once operations begin the Proposed Point of <br />Cg=liance shall be the down-gradient monitoring well just south of the concrete leachate collection barrier at <br />Venture Resource's property line (see Exhibit E). Any potential of seepage and/or infiltration can be monitored <br />here, on a quarterly basis, and compared to the pre-existing, baseline. <br />The following monitoring/sampling parameters shall be followed: <br />• 1. Unlock and open security cap. <br />2. Insert a clean bailer-style sampler (nominally 0.5"-1.5" OD x 12"L) into the casing and lower via a clean, <br />nylon cord. <br />3. Let the sampler reside at the bottom of the casing (20'-25') for at least 2 minutes. <br />4. Carefully pull the sampler back to the surface. <br />5. Label a new clean bottle and complete the report with the following data: <br />a. Date/time of sample <br />b. Location, Up- or Down-Gradient <br />c. Approx. depth of liquid level in bailer, in inches from bottom of borehole. <br />d. If none collected, record on report "Dry" <br />e. Sampler's signature <br />6. Pour any contents into the labeled, clean, plastic sampling bottle. <br />7. The sample report shall be recorded with the Venture Resources office. <br />8. Any collected water will be forwarded to an independent analytical laboratory that can perform the <br />following tests: <br />a. RCRA metals, total concentration <br />b. pH <br />9. Returned lab results will be attached to the appropriate field report and maintained at the Venture <br />Resources office. This data will be preserved for the entire life of the operations. <br />10. In the event that data is received indicating a problem, ie reported levels are higher than the baseline values <br />established in Exhibit C, operations shall be ordered CEASED until the problem can be identified and <br />corrected. <br />It shall be noted, the Colorado School of Mines owns over a dozen properties down-gradient of this proposed <br />operation. One of which, the Edgar Union Lode, contains three large dumps that are 350' downgrade from the <br />proposed Tailings Impoundment. Inorder to not be adversely impacted by the acid runoff from the CO School of <br />Mines' property, the aforementioned monitoring well will be the best Point of Compliance. <br />14