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' 14 August 2000 i AGE-NC Protect No 95-0128 IPage 5 of 10 Marks and Description at 41 50 feet above mean sea level (msl) The results of the monitoring well survey are contained in Table 1 The surveying report (Baumbach & Piazza) is presented in Appendix C I 28 WASTE WATER AND SOIL DISPOSAL Water and soil cuttings generated during the installation of the ground water monitoring wells and well sampling events were collected by A 3CO Environmental and Nor Cal Oil The water was disposed under manifest at Invirotech in Lincoln, California and/or Arnenclean in Silver Spring Nevada and the soil cuttings were disposed of under manifest at the Altamont Landfill The manifests are attached in Appendix D 3.0. FINDINGS ' Ground water elevations were determined b subtracting the measured depths-to-water from the Y g p • surveyed casing elevations Ground water flow directions were determined by contouring the water elevations on a scaled site plan (Figure 2) I31 STRATIGRAPHY During the installation of borings off site, light brown to brown, dry, sandy silt was encountered at 5 to 25 feet bsg Poorly graded fine to medium sand was encountered at 30 feet to 45 feet bsg Gray or tan, wet, coarse-sand with pebbles was locally encountered at depths of 30, 35 and/or 40 feet bsg An indurated clay generally underlaid the sand at depths of 40 to 60 feet bsg Ground water was present in the gravel and sand Petroleum hydrocarbon odor was not noted in the Isamples collected Stratigraphic cross sections are depicted in Figures 5 and 6 Organic vapor was not detected in the soil samples recovered from bonngs MW8 through MW 12 PID data is included on the boring logs (Appendix A) 3 2 GROUND WATER ELEVATION AND GRADIENT The average ground water elevation on 26 April 2000 was approximately 4 54 feet higher than the average ground water elevation on 31 January 2000 The ground water in monitoring wells MW 1 ' Advancer!CeoEnvironmeutAf Inc I