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I ' <br /> Ld <br /> 4 . 5 GROUNDWATER ELEVATIONS <br /> Grcundwater levels were measured on September 8, 1987, and <br /> '* converted to (relative ) elevation after surv3yir.g. Because <br /> the grad4ent was very nearly flat, the wells were resurveyed <br /> Ea and groundwater levels re-treasured during the week of October <br /> 12, 1987. The results of that survey are presented in Table <br /> 4-8. Assuming that the relative elevations represent the <br /> (; surface of a common plane, a groundwater gradient of 0 . 428 to <br /> the (approximate) northwest is indicated. The three-point <br /> problem calculations are presented in the Appendix. The <br /> gradient of: the shallow ground water corresponds approximately <br /> to the northwest trending topographic depression noted on the <br /> north side of the building. <br /> i� <br /> x <br /> i <br /> �9 <br /> f <br /> e <br /> 4-17 <br />