1991-04-01_HYDROLOGY - M1977378 - Laserfiche WebLink

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WATER MONITORING FOR SUNNYSIDE MINE AND MILL DATA AVAILABLE THROUGH MAY 1991 PART I - 1990 - 1991 MONITORING SITES All sites were monitored as required by permits . In addition, two sites were voluntarily added by the company on Cement Creek to improve information data base. Sampling on the American Tunnel waste pile sites was increased in frequency to a monthly basis . Sites and description are listed in Appendix B - Table 1 . PART II - SAMPLING AND LAB METHODS: Quality assurance work continues. Two labs are regularly used for NPDES work . Results between the two labs have been in line with each other in respect to zinc. Total Suspended Solids varies frequently, however with higher numbers generally coming from the lab with the greatest transit time. The pH drops significantly in shipping resulting in higher TSS values at the time of analysis. It is not known whether this also effects bio assay tests . PART III - COMPUTER DATA BASE: The computer data base continues to be improved and expanded. It is hoped this will be useful in solving the toxicity problem at the Mine and Mill with respect to bio assay tests . PART IV - WATER QUALITY DATA, APRIL 1990 TO MAY 1991 : Data collected for MLRD monitoring sites is presented in Tables located in Appendix B and described briefly below. MAYFLOWER MILL AREA: (1 ) Tailings Pond 3 Ditch (SCTP3-1 , SCTP3-2) , Table 2 and Table 3. SCTP3-1 above Pond #3 was sampled Spring and Fall and is comprised of run off and seeps out of the hillside. Of interest is the Fall 1990 sample which shows relatively high pH, TDS , sulfate and fluoride values as well as the unusual presence of carbonate. The flow from SCTP3-2 has been virtually non existent this past year . Water from above is seeping into the ground approximately 200 feet above the road culvert which leads to the south , newly graded ditch. - 7 -