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J.E. REYNOLDS & ASSOCIATES <br /> 4210 SO. YUKON WAY <br /> LAKEWOOD, COLORADO 80235 <br /> PHONE (303) 989-9443 <br /> FAX: (303)989-9477 <br /> July 2, 1990 <br /> Ms. Diane Delaney r ` <br /> Mgr. Government Affairs <br /> Mid-Continent Resources, Inc. NOV 0 1 "I;g�� <br /> 201 Centennial St., Suite 406 <br /> Drawer 122 <br /> Glenwood Springs, Co. 81601 <br /> Re: Laboratory Tests Flocculation and Clarification of Mine Drainage Water <br /> Dear Diane: <br /> Five 2-gallon samples of mine drainage water taken from the tunnel discharge by Lew <br /> Thompson in early June were treated in the laboratory to evaluate new flocculants. <br /> Purpose of the testwork was to obtain design data for an alternate treatment of the mine <br /> drainage to lower suspended solids to less than 35 ppm. <br /> Table 1 describes a series of clarification tests conducted in Hazen Research labs in Golden <br /> on 5 samples. Most of the work was carried out on a sample taken May 29. <br /> Laboratory Procedure <br /> A one-gallon sample of drainage water was wet-screened on a 200 mesh sieve and the -200 <br /> mesh slurry used in subsequent tests. The +200 mesh solids were saved for furthur size <br /> characterization. Flocculants were made up to a strength of 1 g/l and added to 250cc <br /> samples with stirring for 5 minutes. Flocced suspensions were settled for 5 minutes to 4 <br /> hours. Early in the program to evaluate flocctilants, a standard procedure of 5 minutes <br /> agitation and 5 minutes settling was adopted. <br /> At the end of the settling time, trace amounts of floating solids were skimmed and decantate <br /> siphoned to a Milipore filter apparatus. <br /> Residual TSS were weighed to +0.1 mg and reported to +1 ppm. <br /> Observations and Conclusions <br /> *Nalco 9707, a nonionic acrylamide polymer, was the most effective flocculant of <br /> those tested in the lab. <br />