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sample3 since water quality results would show the effects of evaporation and <br />- stock use and could not be used to evaluate potential mine impacts. The 1994 <br />samples and most of the previous water quality samples were analyzed by ACZ <br />Laboratories, Inc. Steamboat Springs, ~, a USEPA certified laboratory. This <br />report includes data collected specifically to meet requirements of the Division <br />of Minerals and Geology (DNG), as well as data collected to meet requirements <br />of the Colorado Wastewater Discharge Permit System (NPDES permit). A list of <br />all monitoring stations within the angle-of~3raw 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 1994. <br />NPDES M1NI7oRING POINTS <br />The mine has six NPDES discharge monitoring points (see Map No.'s 4-1, 8-lA, and <br />8-3). All six points were ~ronitored in aocardance with permit requirements <br />during periods of discharge. Three of the six discharge points experienced <br />discharge during 1994. Point 001, consisting of effluent from a wastewater <br />treataent 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 Cepartment of Health (CDOH) and Envimnrrental <br />Protection Agency are included in the data summaries following this narrative. <br />A total of three NPDES permit limitation exceedences were recorded and reported <br />throughout the year. lko exceedences were a result of not meeting the minimum <br />perrent removal criteria for BDD at outfall 001 in May and September although <br />the maxvmmiallowable effluent BOD concentration was within permit limitations. <br />A permit amendment deleting the 858 m;n;nnim removal criteria was approved <br />effective October 1, 1994. The third exceedence was a result of not meeting the <br />thirty day average effluent BOD concentration for outfall 001 during the iconth <br />of July because of a mechanical failure of the aeration equipment. The <br />equipment was repaired and the BOD concentration values were reestablished <br />within permit limits by the end of July. <br />• OVESt C,3t0UDIDiVmZER MOdiITORING WELLS <br />Groundwater monitoring wells BO1 through B08 are situated in the vicinity of the <br />East Mine facilities (see Map No. 8-lA). Well B07 was monitored for annual <br />2 <br />