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l~ <br /> <br />I <br />September 18, 1964 when operation of the truck wash facilities beGan. N'a ter is siphoned <br />from the Waoge Impoundment (NPDES OC2) into a hol dine pond. Overflow from the holding <br />pond is diverted into the shop ditch which flows into NPDES 003. Water pumped from the <br />holding pond goes to the wash rack, into a settling pond, and then into the same shcp <br />ditch. This operation has increased the flow at NPDES 003 while decreasing the fl orr at <br />NPDES 002. Total flow in 1966 (from Table 23) was 333 ac-ft, r+hite it was 313 ac-ft in <br />1985, showing that the operation of the truck wash facilities has resulted ir. a <br />stabilization of average annual flow at this site. Abnormal spikes noted on the <br />hydrograph are tlue to weekly flow measurements taken when the truck wash is flowinc at <br />full volume. Peak mean daily flow during spring runoff was 1.0 cfs on February 27, 198E, <br />while it was 0.85 cfs on April 20, 1985. The truck wash operation, however, tends to mask <br />the natural runoff peak. <br />Review'of Table 17 shows a dramatic shift in water quality in 1965 and 1966. Prior to the <br />truck wash operation, 7DS of the flows at NPGES 003 range from 1,200 to 1,600 mgl7 with no <br />dominant cations and sulfate the major anion. After the truck wash operation, the TDS <br />range increased to 2,400 to 2,600 mgll while magnesi un became the dominant cation, <br />Sulfate remained the major anion, and bicarbonates dropped 10 percent. This water, as one <br />would expect, is almost identical to that found at NPDES 002. No excursions of NPDES <br />effluent limits were observed in 1986. <br />C. Grassv Creek Drainaoe <br />Tn'o monitoring Sites lie within the Grassy Creek drainaee: surface water site SW-52-7 <br />located upstream on Crassy Creek, and surface water site SW-52-2 located approximately 0.1 <br />mite downstream of where sediment pond 003 discharges into Grassy Creek. <br />1. Surface Water Site SW-52-1 <br />This site monitors the upper reaches of Grassy CreeY,. Review of the hydrograph Of monthly <br />flow readings shows less runoff in 1986 than 1965. CSG data shows a peak flow of 7.6 cfs <br />in the spring of 1966, compared to 12 cfs the spring of 1985. <br />Review of Table 18 shows the water at this site to be a calcium sulfate type. Increasing <br />sulfate concentrations and slightly increasing TDS values are most likely due to the <br />Grassy Creek Mine (Rockc astle Coal Company) located approximately five miles upstream. <br />This site is upstream of any influence by the Seneca II Mine. <br />48 <br />