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MAYFLOWFR MILL AREA: (Cont. ) <br /> (6) Mill Tailings Pond #4 Wells , Figures 3 and 4. <br /> Wells on section-line 22+00 were monitored through the year . <br /> It has been determined that there has been some confusion <br /> properly identifying wells 13A86 and 1386 on this line in <br /> past years . It was erroneously reported in the 1989 MLR <br /> report that the water level in well 13A86 had dropped 25 ', <br /> feet due to reconstruction of the pond berm in the summer of <br /> 1989 . This drop does not appear to have occurred. <br /> Wells 13A86 and 1386 are located within 10 feet of each <br /> other at approximately the same elevation on Section Line <br /> 22+00 . 13A86 is the western, more shallow well with an <br /> average water level depth of 9402 feet above sea level . <br /> 1386 is the eastern, deeper well with an average water level <br /> death of 9376 . A summary of relevant data is given below <br /> showing a remarkably consistent range of water levels <br /> despite changes in pond deposition method in May 1989 and <br /> steadily increasing pond water elevation over the years. <br /> Date Pond 1386113AB6 126 1386 1306 13A86 <br /> Rater Ben Dater Well He Dater Dell Btâ–  <br /> Elev. Elev. Elev. Elev. Elev. Elev. <br /> 02-Sep-B6 9403 9410 937E 9400 <br /> 05-May-09 9412 9374 9402 <br /> 15-Mar-90 9418 9414 931E <br /> 16-Apr-90 9419 9379 <br /> 16-Aug-90 9421 9375 <br /> 27-Sep-90 9420 9375 <br /> 26-Oct-90 9424 9375 <br /> 03-Jan-91 9422 9375 <br /> 15-Apr-91 942B 9373 <br /> 09-May-91 9427 9377 9360 9403 9392 <br /> Figures 3 graphically depicts this information. Figure 4 <br /> represents a section along line 22+00 . The label "perf <br /> pine" on the section near oond level refers to the <br /> perforated pipe attached to the drainage net underlying the <br /> beach. The wells will continue to be monitored in 1991 . <br /> (7) Mill Tailings Pond #4 North Bank Seeps <br /> A number of intermittent seeps from the hillside directly to <br /> the North West of Tailinqs Pond #4 are contributing acid <br /> water to the area. Preliminary investigation shows flows up <br /> to 100 GPM and nH values ranging from 2 . 5 to 6. 5 units. The <br /> cause of the acidity appears to be the highly fractured <br /> pyritic volcanic porphyry unit outcropping at the base of <br /> the hillside. No acid producing disturbances have been <br /> identified above . More sampling for base line data is <br /> planned in 1991 . <br /> - 9 - <br />