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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-1. 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 (W-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 9390206.000 12 <br />