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<br /> 7 <br /> <br />was initiated in early June <br />the sources and nature of <br />The major inflows into Pond <br />TCC underground mine sump (site 109) <br />Wedge sump (site 113} <br />{ Area 2 Pit overflow (site 7j <br />i Flow measurement and weekly sampling of the three inflow sources <br />in addition to weekly Pond D discharge sampling was initiated in <br />early June. <br />Instantaneous flow measurements of discharge from Pond D (CYCC <br />site 84, NPDES outflow 005j and of the P_rea 2 Pit overflown are <br />taken using a V-notch weir and 4-inch flume respectively. Due to <br />the intermittent nature of the flow from the underground mine <br />} sump and from the Wedge sump, only average flow rates may be <br />( calculated from periodic readings of cumulative flow meters <br />installed on the respective discharge lines. <br />Sampling of sites 109 and 113 is difficult due to the <br />intermittent nature of the flow. For example, the underground <br />mine sump is pumped at a rate between 500 to 1000 gpm for <br />approximately 1/2 hour at intervals of 2-4 hours. Initially, <br />samples were collected from a bucket left under the discharge <br />from the mine sump. It became evident that the suspended <br />t material in the water sample was a critical factor in total <br />L metals concentrations, and it has been recommended that this <br />proceedure for sampling be discontinued. Total suspended solids <br />and total metals analyses from these sources may be <br />1 underestimated from these samples. <br />t <br />Samples were analysed for all parameters listed in the NPDES <br />~ permit CO-0027154 plus dissolved iron, copper, zinc, and silver. <br />_ The early data indicated that only zinc and silver presented <br />potential complience problems. Consequently, analyses for all <br />metals except zinc and silver were drooped from the monitioring <br />program for the inflow sources, after the first few weeks. <br />The analytical results for sampling from each site are summarized <br />in Tables 1 through 4. Only the parameters of concern are <br />- included in these tables for ease ~` evaluat.:_n. In order to <br />compare contributions from the various sources more easily, the <br />analytical results for Total Suspended Solids (TSS), total zinc, <br />_ and total silver are tabulated separately in terms of absolute <br />concentrations (Tables 5,6, and 7) and as flora adjusted <br />contributions for zinc and silver (Tables 8 and 9). <br /> <br /> <br />2.0 DSONITORING PROGRAM <br />2.1 Pond D Inflows and Outflows <br />A water quality monitoring program <br />1985 which was designed to identify <br />potential NPDES permit exceedences. <br />D were identified as: <br />