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Mocha Loam. 0-2% Slope. Well drained, on alluvial fan or flood <br />plains. Moderately alkaline and calcareous throughout. Moderately <br />permeable. Effective rooting depth of 60 inches or more. Low - <br />moderate shrink -swell potential. High risk of corrosion to uncoated <br />steel; low risk of corrosion to concrete. Water table is greater than six <br />feet deep. Depth to bedrock is greater than 60 inches. Available water <br />capacity is 9.5 -12 inches. <br />San Emigdio Fine Sandy Loam. 0-2 % SloRe. Well drained, occurring <br />on flood plains and alluvial fans. If soil is bare, runoff is slow and the <br />erosion hazard is slight. Moderately alkaline and calcareous <br />throughout. Moderately rapid permeability. Available water capacity is <br />7 -9 inches. Water table depth is greater than six feet. Depth to <br />bedrock is greater than 60 inches. Low shrink -swell potential. High <br />risk of corrosion to uncoated steel; low risk of corrosion to concrete. <br />Riverwash. Unconsolidated alluvium, generally stratified and varying <br />widely in texture. Runoff is generally rapid and the erosion hazard is <br />high. Deposition and removal of alluvium is common. <br />Hueneme Fine Sandy Loan, Drained. Nearly level, on large alluvial <br />fan or flood plains. Water table has been lowered by pumping wells or <br />construction of flood control channels and is now permanently below 60 <br />inches. If soil is bare, runoff is slow and the erosion hazard slight. <br />Available water capacity is 7 -9 inches. Effective rooting depth is 60 <br />inches or more. Low shrink -swell potential. Nigh risk of corrosion to <br />uncoated steel; low risk of corrosion to concrete. <br />4. Hydrology <br />Two portions of Bristol Street in the project area are subject to <br />significant flood hazard, according to the Flood Insurance Study for <br />Orange County and incorporated Areas, prepared by the Federal <br />Emergency Management Agency (FEMA) on September 15, 1989. At <br />the southerly end of the proposed project, from St. Gertrude Place to <br />Warner Avenue, the project is influenced by a southeasterly trending <br />area which is subject to overflow with a 1.0 foot flooding depth from a <br />140 -year flood from the Santa Ana River to the west (see Figure 12). <br />At the northerly periphery of the project, Bristol Street is affected by <br />overflow from the Santiago Creek Channel, which has the potential for <br />overtopping its banks and the Bristol Street Bridge during a 100 -year <br />storm. This channel is identified in the FEMA study as a floodway. <br />III -7 <br />