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MAYFLOWER MILL AR`r.A (continued) : <br /> (2. ) Boulder Creek (BC-1 , B(7-2) , Table 2. <br /> Data collected in October 1988 and April 1989 shows higher <br /> concentrations of TDS and some dissolved metals below the <br /> tailings ponds . TSS was lower below the tailings ponds in <br /> October 1988; higher in April 1989 . <br /> (3 ) Engineering Office Monitoring Wells (EOMW-I , EOMW-2) , <br /> Table 3 . <br /> The October 1988 sample of these wells shows unusually high <br /> TDS and dissolved metals . The April 1989 sample shows more <br /> historically normal results , with water quality values the <br /> same or below those found in the Animas River . It is <br /> suspected that the positive pressure hand-held pump used in <br /> filtering the samples in October 1988 may have been <br /> malfunctioning, contaminating the dissolved metal. sample <br /> with suspended solids . The April 1989 sample reflects the <br /> vacuum filtrated lab method referred to in Fart II of this <br /> Section. <br /> (4 ) Animas River (AR-3 . 5 , AR-4) , Table 4 . <br /> There appears to be no significant difference in TSS , TDS, <br /> pH , or dissolved metals between AR-3 . 5 (upstream) and AR-4 <br /> (downstream) . It is noted that the river was sampled at a <br /> relatively high volume in April 1989 due to an unseasonable <br /> warm spell which resulted in early run-off . The sites were <br /> resampled in May 1989 at loser water , with results still <br /> pending. <br /> AMERICAN TUNNEL AREA: <br /> (1 ) Cement Creek (CC-1 , CC-2) , Table 5. <br /> The American Tunnel Discharge (AT004) is reflected in the <br /> differences between CC-1 and CC-2 . Average flow for AT004 <br /> is 2 . 2 mgd, which can be as much as 990 of the flow sampled <br /> at CC-2 . During 1988-1989 , the Sunnyside made progress <br /> toward meeting the NFDES limits for AT004 through addition, <br /> of lime and non- ionic ,polymer . Improved consistency in <br /> water treatment , a higher pff and Lower dissolved :petals is <br /> reflected later in the year . Lime treatment accounts for <br /> higher 'TDS, hardness , and calcium in CC-2 . The abnormally <br /> high TSS volume for CC-2 in January 1.989 is unexplained as <br /> AT004 TSS value for that day was 28 mg/l. The abnormally <br /> high Zinc value in August 1988 may be related to the pond <br /> cleaning which was occurring on the day of the sample . <br /> - 8 - <br />