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MainPlace Mall Transformation Project 12126.001 <br />concept for the site is separated into nine (9) detached parcels and would allow <br />for 1,900 multi -family residences; 750,000 square -foot of office uses; 400 hotel <br />rooms; and 270,000 square -foot of additional retail uses. At buildout, the majority <br />of parking would be provided in parking structure. The maximum proposed <br />building height would be 20 stories. Vehicular access to the site would be <br />provided from the north (2 access points from Mainplace Drive), east (4 access <br />points from Main Street), west (3 access points from Mainplace Drive) and from <br />the south (1 access point from Mainplace Drive) of the project site. The Tentative <br />Parcel Map has been used as the basemap for Figure 2, Boring Location Map, <br />included with this report. <br />1.2 Scope of Work <br />Our scope of work consisted of a geologic and seismic hazards evaluation of the <br />site and nearby vicinity based on existing information and recent information <br />gathered as a part of the feasibility level exploration performed for the site by <br />Leighton. Documents reviewed in preparation of this report are included in <br />Appendix A, References. <br />1.3 Previous Investigations <br />A geotechnical investigation was performed for the site in 1985 by Irvine Soils <br />Engineering, Inc. (ISE, 1985a), and included drilling of 28 bucket auger soil <br />borings (18- to 24-inch diameter) to depths ranging between approximately 24 <br />and 51 feet bgs. Copies of the boring logs and laboratory test results by ISE <br />(1985a) are presented in Appendix B. It should be noted that the locations of the <br />borings performed by ISE are unknown since the boring location map was not <br />included with copy of the report by ISE (1985a) available for review. <br />ISE also prepared two addendum reports to the geotechnical investigation report <br />(ISE, 1985b and 1986), and provided geotechnical observation and compaction <br />testing during construction of one of the parking structures located in the western <br />portion of the site (ISE, 1987). <br />A feasibility level exploration was performed by Leighton to develop preliminary <br />geotechnical recommendations to aid in developing the transformation plan for <br />the site. The findings of the feasibility level exploration are presented in a <br />separate report (Leighton 2019) <br />2 <br />Leighton <br />