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May 1999 Monthly Report <br /> Page 5 <br /> • There was no construction activity in any of the sub-basins that Sunnyside felt could <br /> impact water quality. <br /> • Runoff was significant due to the wet snowstorm. Conductivity was relatively high <br /> for the runoff conditions (420 umho). <br /> Sunnyside can only speculate that the May sample caught a peak"first flush" event <br /> magnified by the wet snowstorm runoff. Normally this occurs in March—April but in <br /> 1999 the spring snowfall was late possibly delaying the streambed and groundwater flush <br /> event that has been historically observed. <br /> The 12 period moving average of index values for dissolved zinc at A-72 (graph <br /> attached) rose to +0.63 in May and dropped back to+0.61 with the low June monitoring <br /> results. These values are above the +0.577 value (Consent Decree Appendix A-3(d)) <br /> because of the magnitude of the May residual (+4.26) and not due to a continuing pattern <br /> with the residual >+2.0 or an occurrence that could be related to the remediation projects <br /> or mine pool. It can be expected that the 12 period moving average will remain above <br /> +0.577 for the remainder of 1999. If as provided for in the Consent Decree, WQCD <br /> would like to meet and discuss the data please contact me to arrange a meeting date. <br /> If you have any questions on this report, please contact me. <br /> I certify under penalty of law that <br /> I have personally examined and am Sincerely, <br /> familiar with the information submitted <br /> herein: and based on my inquiry of �-� <br /> those individuals immediately responsible Larry Perino <br /> for obtaining the information, I believe Reclamation Manager <br /> the submitted information is true, accurate <br /> and complete. I am aware that there are <br /> significant penalties for submitting false <br /> information, including the possibility of fine <br /> and imprisonment. See 15 U.S.C. Section 1001 <br /> and 33 U.S.C. Section 1319 <br /> cc: EPA—Melanie Pallman <br /> EPA Region 8 (ENF-T) <br /> DMG—Wally Erickson <br /> Allen Sorenson <br />