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-19- <br />• <br />OUTLET WORKS AND SPILLWAY <br />We understand a combined spillway and outlet works type of struc- <br />ture is planned. For purposes of design we recommend that the maximum <br />allowable soil pressure on the underlying clay soils be ].,000 psf. Some <br />settlement of the outlet works structure will occur. We estimate the <br />settlement of the structure to be on the order of 3 inches. Seepage <br />diaphrams must be constructed along the principal spillway and outlet <br />works. We recommend a minimum of at least 3 seepage diaphrams spaced <br />approximately 20 feet on centers. Entrance to the outlet works and the <br />exit point for the spillway should be provided with rock rip rap to avoid <br />problems with erosion. <br />• LIMITATIONS <br />The exploratory borings were spaced to develop a reasonably accurate <br />determination of the subsurface conditions at the site. However, variations <br />in the subsoils not indicated by the borings are always possible. Con- <br />struction of the earth dam should be under the continuous observation of <br />a competent geotechnical engineer to achieve the appropriate use of soils, <br />as well as proper placement and compaction. Continuous observation during <br />construction also permits observation of the conditions exposed by ex- <br />cavation and it is possible to recognize problems not indicated by the <br />field investigation. <br /> <br />