2010-04-20_REVISION - M1977300 (9)

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Cotter Corporation PROCEDURE Number: 3-4 Schwartzwalder Mine Page: 1 of 7 Golden, Colorado WATER MONITORING Revision: 7 Date: 04/15/20 10 WATER MONITORING 1.0 Purpose To set forth ground and surface water sampling methodology at the licensed facilities for compliance with License Condition 23.0 and 23.2 of RML 369-03S; Amendment 08. 2.1 Frequency All ground water sampling locations are sampled on a quarterly basis. Ground water is monitored at the following locations: 1 Monitoring Well 00 9 Monitoring Well 9 2 Monitoring Well 0 10 Monitorin g Well 10(2) 3 Monitoring Well 1 11 Monitorin g Well 11 s 4 Monitoring Well 2 12 Monitorin g Well 12 5 Monitorin Well 3A 13 Domestic Well 6 Monitoring Well 6 14 Monitorin g Well 13 a 7 Monitoring Well 7 15 Monitorin g Well 14 8 Monitoring Well 8(1 TABLE NOTES: • (') Monitoring well #8 (MW8) has historically always been dry. Should the well contain sufficient groundwater to sample in the future, water sampling will begin per the normal schedule for other wells. At minimum, water level is taken quarterly to verify a continued lack of groundwater to sample. (Z) Monitoring well #10 (MW10) is usually dry, and is monitored for water level only. The well is not monitored for water quality, because bentonite was detected in water from within the filter pack shortly after well completion. (3) Monitoring well #11 (MWl1) was properly completed. However, the bentonite seal may have entered the water column starting in 2008 as the low-permeability well was purged for sampling. Further evaluation may be warranted. (3) Monitoring wells #13 and #14 (MW13, MW14) are proposed bedrock wells, planned for installation in 2010. 2.3 Sample Collection 2.3.1 General Requirements (if sending to Mill for analysis) Acidify all samples with nitric acid (concentrated) to pH < 2, after filtration. All sample collection and filtration equipment is cleaned with detergent and rinsed with deionized water prior to initial use. A thorough rinse with deionized water is sufficient for decontamination between sample locations. Sampling equipment rinse water is also screened for acceptable conductivity readings (<50 gS/cm) before each new location is sampled. Calibrate the pH meter for in-field parameter measurement (pH/conductivity /temperature) prior to each day of use. Sample collection should proceed sequentially from the location with historically low conductivity to the location with historically high conductivity to minimize potential sample cross- contamination. 2.3.2 Sample Collection Method(s) General- Monitoring Wells (if sending out-of-house for analysis) Water levels will be measured prior to sampling monitoring wells. Water levels will be used to determine well casing volume. Each monitoring well will be purged of three well volumes before sampling. Purge water is contained and transported to Canon City Mill for disposal. Each well will be purged using one of the following devices: 1) PVC-bailer 2) air-driven bladder pump 3) dedicated submersible pump