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, 1 1 l errectly? rooting depth 1s at 20 to 40 inches, the shallowest or all the ocher soils on the property. Water may be perched ror brier periods above the claypan and har an after heavy rains or irrigation. y Pro lems. ssociated with San Joaquin sol is are related to use of saturated oils ilowfng rainy periods. Movement of heavy equipment should be 4elaye until the soil is firm enough to reduce extreme compaction. If h e and road building are proposed on these soils, as they are ror Buckeye Ranch, the main limitations are depth to the very slowly permeable claypan and hardpan, high shrink-swell potential of the soil, and low strength In tie claypan. Septic tank absorption is very slow and Is compensated for-by Increasing the size of the absorption rlelds and by including more permeable gravels and sands. Structural damage to buildings and roads is likely unless engineers and architects accommodate the soil properties Into the designs. Specifically, buildings and roads should be designed to of rset the limited abl I f ty of the San Joaquln soils to support a lean ; The i�ast sag i type mapped on Buckeye Ranch are whlc.h define the lake beds. Xerorluvents are very deep soils rormed In alluvium from m xed rock sources. Drainage of these soils ranqes from slow to quite rapid dendin g upon the ,ubstrate. This type or soil is subject to rreGuent, long pe ods of flooding In December through June. As stated in the soil survey, this type of soil Is used for wildlife habitat. Sin the preifmir4an/ pian, the lake beds will continue a wetlands,Since, according to would concdrn laky dredging or deepening or the lakebeds. Depending upon the substraa uncovered during these earthmoving activities, the water holding capti LY the lakes may be altered. i - i 3 �0 ' d OTON 90 : 0I 761'