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4, The Applicant shall submit to the Division for approval aground water monitoring program as a modification to the permit prior to initiation of any blasting or earth-moving activities at the site and prior to any excavation exposing groundwater at the site. The program shall contain all components specified in Construction Materials Rule 3.1.7(7)(b). At a minimum, the monitoring program shall include four monitoring _ wells upgradient of the pit and four monitoring wells downgradient of the pit drilled to the proposed final depth of excavation. An additional monitoring well shall be drilled approximately mid-way along a line between the centroid of the pit and the Black Hawk- Central City Sanitation District well. The nine monitoring wells shall be drilled by the Applicant prior to any blasting or other earth-moving activities and prior to any excavation exposing groundwater at the site. Applicant shall have a geologist on site during the drilling of each of the monitoring wells who shall describe the cuttings during the drilling of the monitoring wells in a written report for each well, and the Applicant shall provide each report to the City of Black Hawk and the Black Hawk-Central City Sanitation District along with a written summary of how the wells were completed, including casing size, size and depth of casing slots, and details of cementing and well development. The constituents to be sampled or measured at each of the monitoring wells include: radioactive pazameters (including gross alpha, radium 226 and radium 228, uranium, thorium 230 and 232), and turbidity, and ground water levels. The monitoring wells shall be sampled monthly and ground water levels shall be measured monthly for a minimum of four months prior to initiation of any blasting or earthmoving activities at the site and prior to any excavation exposing groundwater at the site. Monthly sampling and measurement of the groundwater levels in the eight monitoring wells shall continue until completion of the reclamation and final release of the reclamation bond. The monitoring results shall be reported monthly to the Office of the State Engineer, Colorado Department of Health and Environment, the City of Black Hawk Water Department, the City of Central Water Department, and the Black Hawk-Central City Sanitation District. Drill cuttings from the construction of the monitoring wells shall be monitored and logged for radioactivity. In addition, the Applicant shall agree to conduct and pay for monthly monitoring of the Black Hawk-Central City Sanitation District Wastewater Treatment Plant well for all above-described pazameters, including groundwater levels. If an exceedence of water quality standards is documented in any sample of surface or ground water that can or will leave the property boundaries, upon becoming aware of the test results, the Applicant shall immediately report the results to the Colorado Department of Public Health and Environment by telephone. The Applicant shall resample the source for the parameter(s) in violation, requesting an expedited turn azound time for the second sample results. Within five (5) working days of the initial phone notification, the Applicant shall submit in writing to CDPHE, with a copy to the Division, a copy of the sample results, and the following information: a description of the water quality standazds exceedence and what likely caused it; the period of noncompliance with standazds, including dates and times andlor the anticipated time when the discharge will return to compliance; and all steps being taken to reduce, eliminate, and prevent recun•ence of the noncomplying discharge. 2 of 4