2012-08-13_REVISION - M1982090 (2)

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Section 1.2 Proposed Monitoring Plan In anticipation of conducting the activities described in this TR, CBCI is in the process of reactivating CDPS permit no. CO- 0026981. The CDPS permit application will be submitted to WQCD during August 2012, and the issuance of the permit is expected no later than Spring 2013. To protect adjacent streams, CBCI will develop and implement a stormwater management plan and submit a stormwater permit application to WQCD in tandem with the CDPS permit application. In email correspondence, on January 5, 2010, WQCD (Andrew Neuhart/Permits Unit Manager) dictated to CBCI (K. King) that it need only monitor the 14L discharge for the January 2010 suite of analytes (Table 2) to obtain the CDPS permit. Between the time that construction activities begin and the time that the CDPS permit is issued, CBCI will monitor the 14L discharge (to be designated as sample location CDPS -001) once every two months using the January 2010 suite of analytes (Table 2). Once the CDPS permit is obtained, CBCI will amend its monitoring plan as dictated by the CDPS permit. Typically, WQCD relies upon its own data for characterization of a receiving system in order to determine effluent criteria. Even though it may not be immediately required by WQCD, CBCI intends to collect water quality data from the receiving streams above and below the 14L discharge on a quarterly basis (at a minimum) until the CDPS permit is issued. Upon completion of the activities proposed in this TR, the outfall of the sedimentation pond (sample location CDPS -001) will be the future point of release for the 14L discharge (see Section 2.0). The intended location for the point of release is very close to the confluence of Imogene Creek and Sneffels Creek, which forms the beginning of Canyon Creek. As a result, capturing above and below samples will entail collecting samples from the following 3 locations (Figure 1): 1. CB -A — Imogene Creek up- gradient from the permit boundary 2. CB -B — Sneffels Creek up- gradient from the permit boundary 3. CB -C — Canyon Creek below the mixing zone of the confluence of Imogene Creek and Sneffels Creek, and down - gradient from the permit boundary In summary, the following list outlines the proposed monitoring plan until the CDPS permit is obtained: Location Interval Suite of Analytes CDPS -001 bimonthly Refer to January 2010 suite in Table 2 CB -A quarterly Refer to January 2010 suite in Table 2 CB -B quarterly Refer to January 2010 suite in Table 2 CB -C quarterly Refer to January 2010 suite in Table 2 As stated before and further described in Section 3.0, a new partial flume will be constructed to measure flow of the discharge. Flow measurements from the other sample locations will be collected as field conditions allow. Section 2.0 Sedimentation Pond Construction Construction activities in the portal area could potentially stir sediment into the discharge flowing from the collapsed 14L portal. As a result, CBCI plans to utilize the sedimentation pond that was historically relied upon during previous mining operations. Currently, the sedimentation pond is filled in with topsoil /cap materials and is revegetated (Photo 2). The northern boundary of the pond is still exposed and Technical Revision, Camp Bird Mine 112 Permit (Permit No. M- 1982 -090) Page 4