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71]71 <br /> -7- 2P2/386/61-1 <br /> Soils Data j <br /> i <br /> Subsurface soils and conditions encountered in reference and <br /> !i <br /> current test borings are generally consistent with expectations based <br /> �i <br /> on site review and geologic mapping . Soils encountered on-site can <br /> ` be divided into five units considered significant to proposed deve- <br /> lopment: 1) underlying competent mineral soils; 2) loose-soft minera3.' <br /> - r <br /> soils; 3) peat and highly organic soils; 4) levee fill; and 5) surfi <br /> tial soils disrupted by cultivation. <br /> The underlying competent mineral soils unit was encountered <br /> in all borings and consists of compact to dense (locally semicompact <br /> or very dense) clayey and silty sand, sandy silt and sand and <br /> stiff-very stiff sandy clay. Such soils were typically encountered <br /> K � I <br /> 9 y (at Boring-4) <br /> at depths 1-3 ft below natural round surface ; locally <br /> T as much as 15 ft below estimated original groundsurface (23 ft <br /> kyr <br /> below top of levee) . Once encountered , those soils were penetrated <br /> .to the maximum depth of exploration (52 ft; estimated elev.-44) . <br /> The typical natural soils profile appears to consist of surfi- <br /> e::' - <br /> rIally disrupted (cultivated ) soil over a limited depth (1-3+ ft) <br /> 1 <br /> .soft to. stiff sandy and silty clay that is relatively rich in <br /> :rganic material . Significant amounts of soft/disrupted soils are <br /> r <br /> so expected to be present in the internal drainage/irrigation <br /> annels. <br /> a _ <br />