2012-08-13_REVISION - M1982090 (2)

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to former owner /operator Federal Resources Corp in 1975. The CDPS permit was amended several times by previous operators, and was transferred in its entirety to CBCI in 1990. Following several years of no mining activities, the CDPS permit was issued a notice of discontinuance from WQCD after the baseline conditions of the discharge were demonstrated to be compliant with all Clean Water Act regulations in 1998. The CDPS permit requires that water being discharged into Canyon Creek must meet specific effluent limitations which are established for specific parameters based on protecting water quality standards of the receiving water. CBCI therefore was responsible for monitoring the discharge on a regular schedule to demonstrate compliance with the effluent limitations established by the CDPS permit. The monitoring program included measurements of visual oil and grease and pH on a weekly basis. Laboratory analysis was required for suspended solids, cadmium (total recoverable), copper (total recoverable), lead (total recoverable), mercury (total) and zinc (total) three times per month. In addition, monthly and quarterly analysis of cyanide was required. Water quality results were provided to CDPHE each month on standard `discharge monitoring reports' (DMRs) which can be made publically available through a standard information request of CDPHE. CBCI has obtained the water quality data collected under the CDPS permit during 1995 and 1998. CBCI believes that this data is a valid representation of baseline conditions of the 14L discharge because no activities were occurring at the 14L drift - similar to today. These data, from December 1995 to July 1998, are provided in Table 1. Copies of the raw data sheets are provided in Attachment A. In addition to the data provided in Table 1, CBCI has collected 3 recent sets of water samples of the 14L discharge in December 2009, March 2010, and July 2012. These samples were analyzed for a robust suite of analysis as dictated by WQCD's sampling requirements for re- activating a CDPS permit. The analytical results from the recent sampling efforts (2009 to present) are provided in Table 2. Copies of the raw data sheets are provided in Attachment B. These more recent results fall well within the range of results reported during the time when the CDPS permit was last active, indicating that water quality conditions have remained the same for at least the past 17 years. Flow rates of the 14L discharge also appear to be similar to the past. Based on the January 9, 1989 amendment to the CDPS permit, annual flow rates of the 14L discharge ranged from 1.5 cfs (673 gpm) between November and April; 1.3 cfs (584 gpm) between May and July; and 3.5 cfs (1,571 gpm) between August and October. Since the CDPS permit was terminated in 1998, the partial flume used to measure the discharge has deteriorated and is not functional. However, CBCI measured 1,211 gpm on July 15, 2012 using a wading rod and pressure transducer (Marsh McBirney Flo -Mate 2000). As part of the activities proposed in this TR, CBCI will construct a new partial flume to monitor flow in the future (see Section 3.0). As per rule 3.1.6 (116(7)(g)) within the Hard Rock, Metal and Designated Mining Operations Mineral Rules and Regulations (CMLRB, 2011) baseline water quality conditions were established by compiling the analytical results from the historic CDPS permit and from the recent samples gathered by CBCI. Results of the compilation of historic CDPS water quality information as compared to recent quarters of sampling results indicates that water quality and quantity is currently comparable to information gathered under the CDPS permit. Therefore it appears that the baseline hydrologic conditions of the 14L discharge have been adequately characterized. Technical Revision, Camp Bird Mine 112 Permit (Permit No. M- 1982 -090) Page 3