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• and most of the previous water quality samples were analyzed by ACZ Laboratories, Inc., <br />Steamboat Springs, Colorado, a USEPA-CERTIFIED laboratory. This report includes <br />data collected specifically to meet requirements of the Division of Minerals and Geology <br />(DMG), and data collected to meet requirements of the Colorado Wastewater Dischazge <br />Permit System (NPDES permit). A list of all monitoring stations within the angle-of- <br />draw of the mines is presented as Table 5. it can be noted that eight additional stations <br />were added as a result of mining during this reporting period. <br />NPDES MONTTORING POINTS <br />The mine has six (6) NPDES discharge monitoring points (see Map No.'s 4-1, 8-1, <br />and 8-3). All six points were monitored according to permit requirements during periods <br />of discharge. Two of the six discharge points experienced discharge during 1996. <br />Outfall 001, consisting of effluent from a wastewater treatment facility, discharged <br />.continuously throughout the year. Outfall 006, a sediment pond at the West mine <br />respectively also had reported discharge. Copies of the DMG cover letters provided to <br />the Colorado Department of Health (CDOH) and Environmental Protection Agencies are <br />included in the data summaries following this narrative. <br />OVEM GROUNDWATER MONITORING WELLS <br />Groundwater monitoring wells' BO1 through B08 is near the East Mine facilities (see <br />Map No. 8-1). Well B07 was monitored for annual water quality parameters as it is <br />downstream of the East mine facilities. Wells BO1 through B06 and Well B08 are <br />monitored semiannually for water levels to assess slope stability in and around the East <br />mine facilities. <br />Patterns typically associated with these wells in the past were again evident during <br />the 1996 monitoring. Wells BOI, B03, BOS, B06, and B08 remained dry throughout the <br />year. Wells B02 and B04 showed moderate water level's fluctuations within the <br />established normal ranges previously documented. Conductivity values at B07 remained <br />within the range of values previously established. Other monitored parameters fluctuated <br />slightly with established ranges. The 1993 report showed that sulfate and total dissolved <br />solids may be slightly elevated at B07. In 1996 sulfates averaged 255 mg/1 compared <br />with the 1993 average of 380 mg/1. The 1996 TDS average values were 850 compared <br />• with the 1993 average of 1, l88 mg/l. The 1992 AHR presented minimum and maximum <br />Page -2- <br />