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<br />. <br /> <br />. <br /> <br />5 <br /> <br />During our July 10, 1984 si te inspection, longitudinal cracking <br />was observed on the crest about 1 to 2 feet from the upstream <br />edge. The cracking, however, was not as severe as previously <br />reported by the State Engineer, Apparently, infilling of many of <br />the cracks occurred as the result of rainfall. However, a few <br />cracks were still pres8nt that had widths of up to 1.5 inches <br />(Figure 7), On May 31, 1985, Mickey Groves from the Town of <br />Victor, informed us that the longitudinal cracking was beginning <br />to reappear on the crest of the dam, <br /> <br />The materials used to construct the dam are unknown at the <br />present time. Based on potential nearby borrow sources, however, <br />it is likelY that the dam was constructed of on-site silty <br />gravelly sand classifying as SIJ (Unified Soil Classification <br />System). These materials are generally found along alluvial <br />channels (alluvium) and on hillsides (colluvium) near the site. <br />The parent rock for these materials is the Pikes Peak granite. <br /> <br />It is also possible that the structure contains some type of <br />internal cutoff wall and/or downstream toe drain because no <br />seepage is readily observable along the downstream face of the <br />dam. A partially exposed concrete wall is located on the north <br />side of the spillway, in line with the crest of the dam. This <br />could possibly represent a portion of an internal concrete cutoff <br />wall. If this is not a cutoff wall, it is possible that seepage <br />could be flowing from a toe drain directly into coarse-grained <br />alluvial deposits underlying the dam, and is therefore not being <br />observed at the surface, <br />