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sampled since water quality results would show the effects of evaporation and <br />stack use and could not be used to evaluate potential mine impacts. The 1995 <br />samQles and most of the previous water quality samples were analyzed by ACZ <br />laboratories, Inc. Steamboat Springs, CO, a USEPA certified laboratory. This <br />report includes data wllected specifically to meet rec~,i rents of the Division <br />of Minerals and Geology (Dht;), as well as data crollected to meet r~~i*~pnts <br />of the Colorado Wastewater Discharge Permit System (NPDES permit). A list of <br />all monitoring stations within the angle-0f-draw of the mines is presented as <br />Table 5. No new stations were added to Table 5 as a result of mining that <br />occurred in 1995. <br />NPDES MJriI7bRING PO1NZ5 <br />The mine has six NPDES discharge tronitoring points (see Map No.'s 4-1, 8-1, and <br />8-3). All six points were mronitored in accordance with permit requirements <br />during periods of discharge. Three of the six discharge points experienced <br />discharge during 1995. Point 001, consisting of effluent frcan a wastewater <br />treatment facility, discharged continuously throughout the year. Points 002 and <br />• 006, sediment ponds below the East mine facilities and at the West mine <br />respectively also had reported discharge. Copies of the DMR cover letters <br />provided to the Colorado Department of Health (CDOH) and Environmental <br />Protection Agency are included in the data summaries following this narrative. <br />One NPDES permit limitation exceedence was recorded and reported during the <br />year. Outfall 002 exceeded three discharge permit limitations (TSS, Iron & Oil <br />b Grease). Between May 3rd and May 11th, the Bowie No. 1 Mine received <br />approximately 1.05 inches of rainfall. An additional 1.1 inches of <br />precipitation was recorded on May 12th. This unusually heavy rainfall in <br />combination with leaks in the binwall valve assembly at Pond #4, severely <br />limited the retention time necessary to meet discharge limits. The problem with <br />pond #4 was corrected during 1995. The valve was repaired and the binwall was <br />grouted with a foam type material. <br />OVFTd C3a0[]id7FU\~R MCtdIR~tiNG WELLS <br />• Groundwater monitoring wells BOl through BOB are situated in the vicinity of the <br />East Mire facilities (see Map No. 8-1). Well B07 was monitored for annual water <br />quality parameters as it is located downstream of the East mine facilities. <br />2 <br />