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INVESTIGATION <br /> The underground at the levee was investigated by drilling 9 test holes and <br /> 3 test pits from the levee crest, and 6 test pits in the foundation on either side of the <br /> levee. Additionally, 3 holes were drilled for Packer permeability tests and 4 for falling <br /> head permeability tests. The test holes as well as the holes for the permeability tests <br /> were advanced using 4-inch diameter, continuous flight augers. The 3 test pits in the <br /> levee crest were drilled using a 42-inch auger and a large caisson drill rig. The six <br /> test pits in the foundation on either side of the levee were excavated using a small <br /> backhoe. <br /> We directed the drilling and excavating of all test holes and test pits and our <br /> field representative logged the soils and obtained samples. The samples were <br /> visually classified and typical samples were selected for testing. Testing included <br /> gradation analysis, Atterberg limits, optimum moisture content and maximum dry <br /> density, permeability, and strength parameters. The location of our test holes and <br /> test pits are shown on Fig. 1. Summary logs of our test holes, test pits and the <br /> results of our field permeability tests are shown on Figs. 2 through 6. The critical <br /> cross-section for the levee, including the proposed levee raise at this section, is <br /> shown on Fig. 7. The results of our laboratory tests are shown on Figs. 8 through 14 <br /> and are summarized in Table I. <br /> SUBSOILS <br /> Our test holes and test pits through the levee penetrated 5 to 10 feet of dense, <br /> clayey, gravelly to cobbley sand levee fill and then the foundation soils. The <br /> foundation soils were mostly dense to very dense clayey, gravelly to cobbley sands <br /> with occasional layers of stiff to very stiff sandy clays. Weathered and unweathered <br /> claystone were penetrated by TH-8 at 16 feet below the levee crest. Weathered <br /> claystone was penetrated in TP-5 on the creekside of the levee at 4 feet and in TP-4 <br /> on the landside at 1.5 feet. The weathered claystone was stiff and claystone was <br /> FLATIRONS COMPANY <br /> LEVEE AT DEEPE FARM PIT <br /> CTL/T 25,385 2 <br />