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MAYFLOWER MILL AREA (continued) <br /> (2) Boulder Creek (BC-1,BC-2) , Table 4 and Table 5 <br /> TSS , TDS and some dissolved metals appear to be generally <br /> higher at BC2 below the tailings ponds. <br /> (3) Engineering Office Monitoring Wells (EOMW-1,EOMW-2) Table <br /> 6 and Table 7 , Figure 1 <br /> The levels in the wells were up approximately three feet in <br /> October 1989 possibly due to the irrigation of the reclaimed <br /> area adjacent to the wells. Dissolved metals were very low <br /> at this time although TDS was up. May 1990 water levels <br /> were back down to a more normal level with some increase in <br /> TDS . Dissolved metals of the extremely high levels reported <br /> for October 1988 were never repeated (Zinc 10. 2mg/l and <br /> 5. 6mg/1 ) and are attributed to faulty filtering procedure. <br /> (4) Tailings Pond 3 Monitoring Wells (TP3-07,04) Figure 2 <br /> Levels in these wells showed little variation in the last <br /> year . <br /> (5) Animas River (AR3 . 5, AR-4) Tables 8 and Table 9 <br /> A second spring sampling at low water in May 1989 showed no <br /> significant difference in dissolved metals and TSS from the <br /> April. 1989 sample . Data collected at these sites does not <br /> show a trend in concentrations above and below the Mill <br /> area. The downstream site actually shows lower <br /> concentrations of dissolved metals in April 1989 and October <br /> 1989; higher concentrations in May 1989 and May 1990 . Many <br /> metals such as Cu, Cr , Pb, and Hg are low or non detectable <br /> in AR4 . <br /> A bioassay of AR3 . 5 was done in Spring 1990 in conjunction <br /> with the lst quarter Biomonitoring of MF002 . The river <br /> water was determined to be toxic with a Fathead Minnow LC <br /> 50>100% but a Ceriodaphnia dubia LC50=24% . It is likely <br /> that the toxicity of the Animas varies season to season and <br /> with run off events . It was determined that it was toxic <br /> enough, however , at this site above the mill to use <br /> reconstituted lab water as the dilution eater in MF002 <br /> Bioassays. AR3 . 5 will be sampled with every MF002 Bioassay <br /> to set dilution water hardness for the MF002 biotests . <br /> -8- <br />