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r <br />5.2 Soils and Geology <br />5.2.1 Environmental Setting <br />' <br />A soils and geology report has not been prepared for the <br />proposed project. A soils and geology report* was prepared, however, <br />1_ <br />for the Fashion Square Parking Structure located west of Fashion Square <br />Shopping Center within the proposed Fashion Square Commercial Center <br />1 <br />project boundaries. This section will summarize the information <br />' <br />contained within that report and will serve as general information of <br />the soil type on the project site. <br />, <br />Natural soils underlying the parking structure and presumably <br />i <br />[' <br />the project site are alluvial deposits associated with deposition by the <br />Santa Ana River. The upper deposits are comprised of variable fine, <br />sand, silt and clay mixtures. In -place consistency was found to be'. <br />t <br />somewhat non -uniform, generally ranging from moderately loose or soft to <br />i <br />compact. These upper non -uniform deposits extend to depths of 12 to 25 <br />feet in thickness. The soils between 25 feet and 50 feet, the maximum <br />' <br />depth explored, consisted of compact to dense, fine to course sands and <br />gravels. <br />(� <br />Artificial fill,.apparently associated with the original <br />overall grading of the Fashion Square site was encountered in all the <br />test borings made within the paved areas that were once located where <br />the parking structure is now located. In general, the depth of fill was <br />¢ <br />greatest along the east edge of the parking structure site and then <br />i <br />gradually decreased in depth toward the southwest. The fill material <br />[� <br />was predominantly comprised of variable silty sand and clayey sand <br />mixtures with occasional sandy clay and clean sand layers. No <br />t <br />* Soils and Foundation Investigation Fashion Square Parking Structures, <br />Soils International, February 23, 1977. <br />75DPi202 <br />