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Mr. Richard Mills - 2 - March 27, 1986 C. An interpretation of trends in water quality on a seasonal basis, on an annual basis, and in comparison with baseline data; and, D. An evaluation comparing the year's results with those predicted by the Probable Hydrologic Consequences (PHC) section of the permit, and a re-evalution of the PHC if appropriate. Analytical Quality Assurance The Division randomly evaluated some of the data to ascertain its quality. Mass balance calculations and an assessment of the equivalence of total dissolved solids with major ions concentrations were run. Cations ran approximately ten percent (10%) lower than anions, although some runs showed cations being thirty percent (30%) lower than solids. This data is of acceptable quality, but a routine calculation of mass balance on all full suite analyses would signal the necessity to rerun a sampling to improve overall quality of the data. C~iLRD observed that the analytical laboratory is routinely not attaining detection limits approaching standards for four heavy metals: cadmium (Cd), mercury (Hg), molybdenum (Mo) and copper (Cu). Table 1 Comparison of Applicable Receiving Stream Standards with Detection Levels Element Standard (ppm) Detection Limit (PPm) Cd 0.001 0.005 Hg 0.00005 0.002 Mo 0.01 0.2 Cu 0.01 0.2 CYCC should ascertain whether their equipment is adequate to attain detection levels lower than the standards or contract with a laboratory which can analyze the lower concentrations. The Division would like documentation of these efforts to improve detection levels by May 15, 1986. Data Formatti The Division has made recommendations on formatting data in their evaluation of the Eckman Park AHR. They are reproduced here as the Mine No. 3 and Eckman Park AHR were formatted essentially the same. 1) A small scale map showing the location of all sampling sites is requested. The large scale maps accompanying the report are often too vague for us to identify whether a site is upstream or downstream of a man-made structure, or on what side of the stream an alluvial well is placed. 2) It would be helpful if you correlated SDP numbers (outfall 00X) with site numbers.