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2-inch polyvinyl chloride abandoned mine shafts acre-feet acre-ft/yr Air Force Base alluvium Altitude andesite basalt basin bedrock biotite brown Class-I wastes concentration cubic hectometres date finished December date finished September deposits diameter 8 inches difficult to auger difficult to drill discharge of Class-I disposal Drilled by U.S. EAFB Edwards Air Force evaporation ponds feet below lsd finished September l973 ft/d gradient gravel ground water ground-water flow ground-water movement Harper Lake Haystack Butte area Helendale hole diameter hydraulic conductivity hydrologic infiltration Kramer Junction land surface lbs/in2 Leuhman fault light-gray metres mg/l moderately difficult montmorillonite percolation playa present l974 rainfall recommended limits runoff silt sludge sodium study area surface-water Test drilling test hole 9N/6W-l9Al Thickness Depth feet tolerance limits Tropico Group U.S. Air Force U.S. Geological Survey U.S. Weather Bureau underflow unlimited Class-I unweathered Volcanic rocks waste discharge waste water water level weathered quartz monzonite World Health Organization