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Water discharging from the Terry Tunnel is slightly acidic and contains elevated concentrations <br /> of some metals. The mean pH values for field and laboratory measurements are 5.9 and 5.7, <br /> respectively. However, the 1991 sampling shows a noticeable drop in the pH values. The mean <br /> values for total metal concentrations are all higher than the mean values for the American Tunnel <br /> with the exceptions of iron and manganese which were not analyzed. <br /> Chemistry of the Terry Tunnel discharge water varies according to changes in surface water <br /> inflow to the upper levels of the mine. The rate of surface water inflow depends upon both <br /> daily and seasonal precipitation, and rate of snowmelt. <br /> 4.2.3 Existing Treatment Facilities - Sunnyside Mine <br /> On Wednesday, July 31, 1991, ,Simon Hydro-Search was given a tour of the Sunnyside Mine's <br /> two lime precipitation systems at the American Tunnel and Terry Tunnel portals. Discharge <br /> from the American Tunnel is directed to a sump in the lime plant where lime is added to <br /> precipitate heavy metals. The tunnel discharge waters and the lime are allowed to mix in the <br /> turbulence created by the inflow to the sump. Discharge from the lime plant sump is by gravity <br /> flow to the first of four sedimentation ponds. None of the ponds are lined. A non-anionic <br /> polymer (Polypure N130) is added to the lime plant discharge somewhere in the 400 feet of <br /> pipeline between the sump and PO: d No. 1. This addition of polymer facilitates the precipitation <br /> of heavy metals and has been accomplished by running a tube down the discharge pipe from the <br /> lime plant sump. However, the exact location of the tube end in the pipeline is unknown. <br /> sanjuan\sunny\110361\oct9l.Rpt 47 <br /> I \ D ❑ D <br /> e0 snon ��o�o��������a <br />