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MAYFLOWER MILL AREA: (Cont. ) <br /> (2) Boulder Creek (BC-1 , BC-2) , Table 4 and Table 5. <br /> As in the past TDS, TSS and some dissolved metals are higher <br /> at BC2 below the Tailings Ponds . The extensive work <br /> regrading and covering Pond #2 the summer 1991 should better <br /> the situation considerably. <br /> An acute bioassay screen using Ceriodaghnia dubia was taken <br /> at BC1 above the mill oroperty with the April 1991 sample <br /> for background information. Only 2 out of the 20 organisms <br /> survived. <br /> (3) Engineering Office Monitoring Wells (EOMW-1 , F.OMW-2) , Table <br /> 6 and Table 7 , Figure 2. <br /> Water levels show no significant change in recent <br /> measurements . Water quality is expected to be the same in <br /> both wells as they are located within 150 feet of each other <br /> in the same general area. Water level trends follow <br /> closely, however it is observed that the zinc level in EOMW2 <br /> is around 2 times higher than that in EOMW1 at times . All <br /> other parameters such as TDS, sulfate and other metals are <br /> reasonably the same. A sample will be taken in July 1991 as <br /> well as October in the interest of spotting_ a trend if one <br /> exists . <br /> (4) 'Pailincs Pond #3 Monitoring Wells (TP3-07 ,04) Figure 1 . <br /> The site Man has been corrected to properly indicate that <br /> TP3-04 is on the west end of the pond and TP3-07 is on the <br /> east end. Water levels in the wells continue to show little <br /> variation . <br /> (5) Animas River (AR-3 . 5 , AR-4 ) , Table 8 and Table 9. <br /> Water duality above and below the mill continues to be <br /> generally the same. The Spring 1991 sampling showed <br /> somewhat higher Zinc levels at AR4 below the mill which may <br /> be attributable to higher than normal zinc levels in Boulder <br /> Creek that day. (See BC2 Table 5) . Increased manganese is <br /> also noted below the Mill . Note many metals such as Cd, Cu , <br /> Cr, Pb and Ho are low or below detection limits at AR4 . <br /> AR3 . 5 uas sampled for hardness numerous times through the <br /> year as the receiving water base line in biomonitoring at <br /> the Mill effluent , MF002. AR3 . 5 is found to be toxic to <br /> Ceriodapnnia dubia as 5 out of 20 survived in testing Spring <br /> 1990 and 0 out of 20 survived in testing Spring 1991 . Acute <br /> test or screens were run for background information. <br /> - 8 - <br />