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I. � IV. Summary In summary, the quarterly ground-water monitoring conducted during the last seven years has provided the data with which to characterize ground-water conditions beneath the Teichert parcels rZ and adjacent areas, prior to and since the commencement of mining. Observed static ground water levels have ranged in depth from 75 feet in shallow wells to the north, to 260 feet in deep wells in the central and southeast portions of the area. Shallow ground water has typically fluctuated less than three feet through the monitoring period and consistently flowed toward the southeast to east- southeast. Deep ground-water levels have been lower and have fluctuated more than shallow levels, apparently in response to pumping of local deep irrigation and production wells. Ground water within the greater perimeter of the permitted mining area has been found to have elevated hardness and EC values. The general mineral quality varies with depth: shallow ground water is of a sodium/calcium bicarbonate/chloride quality while deep ground water is of a sodium/calcium bicarbonate/sulfate quality. There are elevated nitrate concentrations in the shallow and deep ground-water zones that appear to be indicative of historical agricultural land use in the area. During the last six years of sampling, coliform bacteria have consistently been absent from the two domestic wells. Overall, no changes in ground-water levels or quality have occurred that are attributable to the approximate three years of aggregate mining conducted to date in the Vernalis area by Teichert. n AM 11 © LUHOORFF 6 SCALMANINI CONS C U ING ENGINCEPS