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MainPlace Mall Transformation Project 12126.001 <br />and parking structures. The Conceptual Site Plan prepared by Omniplan <br />Architects and dated May 2, 2018 has been used as the base map for Figure 2, <br />Exploration Location Map, included with this report. Description of the planned <br />transformation is included in the document entitled "MainPlace District, Specific <br />Development Plan No. 93, City of Santa Ana, dated May 2018". <br />1.2 Objective and Scope of Work <br />The primary objective of our geotechnical exploration is to provide you with 1) <br />design considerations for the proposed transformation plan for the site and 2) <br />preliminary recommendations for the associated developments. It should be <br />noted that these recommendations are intended for planning purposes only and <br />recommendations for design and construction will be developed form design <br />level exploration. <br />The scope of work performed for our exploration consists of the following tasks: <br />Research - A background review was performed of readily available, relevant <br />geotechnical and geological literature pertinent to the project site. We also <br />conducted a review of Leighton's previous projects (Leighton, 2004) east of the <br />project site. <br />We also reviewed the geotechnical investigation report and geotechnical <br />observation and compaction report by Irvine Soils Engineering, Inc. (ISE 1985a, <br />1985b, 1986, and 1987) for the previous improvement within the proposed <br />project site. <br />Documents reviewed in preparation of this report are presented in Appendix A, <br />References. <br />Field Exploration — Field exploration consisting of eight (8) eight -inch diameter <br />hollow -stem soil borings (LB-1 through LB-8) drilled and sampled at the site on <br />August 20, 2018 and October 29 and 30, 2018. The soil borings were drilled to <br />depths between 16.5 and 51.5 feet below ground surface (bgs). The <br />approximate locations of the explorations are shown on Figure 2, Exploration <br />Location Map. <br />As a part of our field exploration, two (2) field infiltration tests were performed at <br />the site (LB-3 and LB-6) in Parcel 6 and Parcel 1, respectively. <br />2 <br />Leighton <br />