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i <br /> k-1 <br /> 4 -5 GAOUNDWI%TER ELEVATIONS <br /> Grcundwater levels were :.easured on 5eptemwer 8, 1937, and <br /> converted to (relative ) elevation after surveying. Because <br /> the gradient was very nearly flat, the wells were resurveyed <br /> 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 /> i surface of a common plane, a groundwater gradient of 0. 028 to <br /> she (approximate) northwest is indicated. Ttie three-point <br /> r• <br /> : problem calculations are presented in the Appendix. The <br /> gradient of the shallow around water corresponds approximately <br /> y.. <br /> to the northwest trending topographic depression noted on the <br /> north Gide of the building. <br /> 4-17 <br /> 4 l� <br /> ti <br />