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18 <br /> <br />• Cc: Clear Lake clay, 0 to 3 percent slopes, MLRA 14 – The Clear Lake series <br />consists of very deep clayey soils that are well to imperfectly drained. These soils are <br />formed by fine-textured alluvium from sedimentary rock. This soil is slowly permeable, <br />and runoff is very slow, while drainage is moderately good. Root penetration is very <br />deep, and the available water holding capacity is very high. Its stratified layers consist <br />of the following (colors are for dry soil unless otherwise stated). <br />0 to 36 inches – dark-gray clay; strong prismatic structure that breaks to moderate <br />blocky structure; very hard when dry, very firm when moist; very plastic and stick when <br />wet; slightly acid in upper part, moderately alkaline in lower part. <br />36 to 48 inches – dark-gray clay; many seams of gypsum and modules of lime; weak <br />prismatic structure that breaks to moderate blocky; very hard when dry, firm when <br />moist, very plastic and sticky when wet; moderately alkaline. <br />48 to 65 inches – dark grayish-brown and light olive-brown silty clay; contains whitish <br />lime modules; moderate blocky structure; very hard when dry, friable when moist, <br />plastic and sticky when wet; moderately alkaline. <br />• LuD: Los Osos and Millsholm soils, 7 to 30 percent slopes – The Los Osos and <br />Millsholm soil series is an undifferentiated group consisting of both soil types in <br />proportions that vary from place to place. Permeability of these soils is moderate to <br />moderately slow, while runoff is slow to medium and the water holding capacity is low <br />to moderate. Root penetration is moderately deep, and the erosion hazard is moderate. <br />Its stratified layers consist of the following (colors are for dry soil unless otherwise <br />stated). <br />Los Osos Series <br />0 to 8 inches – grayish-brown light silty clay loam; massive; hard when dry, friable <br />when moist, sticky and plastic when wet; medium acid. <br />8 to 30 inches – dark grayish-brown heavy silty clay loam; moderate blocky structure; <br />hard when dry, friable when moist, sticky and plastic when wet; slightly acid. <br />30+ inches – pale-olive shale <br />Millsholm Series <br />0 to 17 inches – olive silt loam; massive; very hard when dry, friable when moist, <br />slightly sticky and slightly plastic when wet; medium acid.