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50 .~ I and the amount of deep percolation, ':! is shown in Table 1P. ~ TABLE 12 1•later Balance Calculations I PIOR;•tAL YEAR IJET YEAR ~ ~ 1 Eva W 1 Eva lJ ` (in) (in) (in) (in) (in) (in) •~ • Apr 1.66 1.66 0 2.92 2.20 .72 ~ ^ ;•1ay 2.15 2.15 0 2.94 2.94 0 Jun 1.44 1.44 0 3.81 3.81 0 Jul 2.86 2.36 0 4.55 4,55 0 Aug 2,85 2.85 0 3,07 3.07 0 Sep 1.05 1.05 0 2.02 2.02 0 Oct 1.14 1.14 0 .08 .OS 0 13.15 13.15 0 19.39 18.57 ,72 Nydroloaic Balance Summar~~ - It is estimated that the annual average pre- cipitation at the Allen 14ine is 16.92 inches. Approximately 3.17 inches of water are lost to evaporation and sublimation during winter months. Based on the calculations on the previous pages, deep percolation in most years will be essentially zero; that is, all percipitation will evaporate from the soil (or runoff). During o-ret years, as much as .72 inches of v,ater may be attributed to subsurface runoff. The total area of the dump is 8.6 acres and the estimated total subsurface runoff during a wet year is approximately .52 acre-feet. Effect Of Dump On Stream Quality The above computation indicates that in a normal year, there will be no subsurface runoff (deep percolation) from the refuse pile. In a wet year, the computed deep percolation of 0.52 ac-ft/yr converts to a mean discharge of 0.01 cfs over a 30 day period and this discharge will enter the stream during the high flow period of spring runoff. One small seep near the east end of the refuse pile (irtcnediately adjacent to well AL 2-1) was observed during the spring, 1930: Again, the "worst case" Situation is that of low • stream flow and the effects of the discharge from the refuse pile were com- ,,,, puted using a mean lo~,+ flow of 3 cfs. Table 13 presents the chemical analyses ~! of a ~,vater sample collected from the seep. Concentrations from Table 13 were