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Due to the nature of the generally fine-grained nature of most depos- <br /> its underlying the proposed landfill site, permeability over underly- <br /> ing sediments is low. A packer test was attempted in Boring P-3, but <br /> failed (seals could not be seated) because of the inability of sedi - <br /> ments to withstand applied pressures. <br /> Two alternative types of in situ permeability tests were conducted on <br /> site to determine the permeability of both the unsaturated and satu- <br /> rated zones underlying the proposed landfill site. The first type <br /> involved slug testing of a saturated sandstone in Well G-l . The sec- <br /> ond type used Permeameters P-2 and P-3 to determine the permeability <br /> of the unsaturated zone below the proposed base of landfill excava- <br /> tion. Test locations are shown on Drawing 1 . Logs of the borings for <br /> the tested permeameters and Monitoring Well G-1 are contained in <br /> Appendix A. Appendix E presents testing procedures, permeability data <br /> calculations, and graphs. <br /> Results of both in situ and laboratory permeability testing are sum- <br /> marized on Table 3. Test results confirm the low permeability of <br /> sediments in the +100-foot-thick unsaturated zone. Permeabilities by <br /> EMCON range from 1 x 10-6 to 2 x 10-8 centimeters per second (cm/sec) . <br /> Similar values were obtained by J.H. Kleinfelder and Associates during <br /> previous investigations. <br /> C. GROUND-WATER QUALITY <br /> Ground water in the eastern portion of San Joaquin County is generally <br /> of excellent quality with low total dissolved solids (TDS) ranging <br /> from 120 to 550 parts per million (ppm) and averaging 200 ppm. <br /> J.H. Kleinfelder and Associates, in conducting geotechnical investiga-. <br /> tions of this site (1986) and the half section immediately to the west <br /> (1980a) , sampled two water wells ( -1 and W-2) on the proposed land- <br /> fill site as well as the Thomas and Zarala wells (see Wells 6 and 19 <br /> on Figure 3 and Appendix F) . The firm also collected a ground-water <br /> sample from a test boring (TW-1) drilled in the extreme southwest <br /> PJ9 9390206.00D 12 <br />