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<br /> <br /> <br /> <br /> <br />October 2, 2025 <br /> Project No. 17-00.15.47 <br />Albert Luu <br />8563 Amazon River Cir. <br />Fountain Valley, California <br /> <br />Subject: Preliminary Foundation Investigation for Proposed Auxiliary Dwelling Unit (ADU) <br />and Junior Auxiliary Dwelling Unit (JADU) to One-Story Single-Family-Home, <br />2422 W. Marty Lane, Santa Ana, California <br /> <br />Introduction <br /> <br />This report presents the results of our preliminary foundation investigation for proposed ADU and <br />JADU to a one-story single-family-home at 2422 W. Marty Lane, Santa Ana, California (see Figure <br />1). The purpose of the preliminary foundation investigation is to provide preliminary geotechnical <br />design parameters for the foundation of the above-mentioned proposed structures. The proposed <br />structures will be wood-frame one-story-structures that are supported by conventional slabs and <br />perimeter footings. The total area of the proposed one-story ADU and JADU will be about 799 and <br />431 sqft, respectively. We anticipate that cut and/or fill will be minor (less than 2 feet thick). <br /> <br />The sites of the proposed structures are covered by concrete tiles and landscape area. The sites are <br />located in the back yard and side yard of the existing single family residence. The sites are <br />relatively flat areas. The property is bounded to the north by Marty Lane and to the other sides by <br />other residential properties. The overall area is also a relatively flat area. <br /> <br />Scope of Work <br /> <br />The scope of work for this preliminary foundation investigation consisted of the following: <br />• Field exploration, consisting of drilling and logging of one boring to a depth of 5 feet; <br />• Laboratory testing of selected soil samples considered representative of the subsurface <br />conditions to evaluate the pertinent engineering and physical characteristics of the <br />representative soils; <br />• Engineering analyses of the collected data to develop geotechnical parameters for foundation <br />design of the proposed new structures; and <br />• Preparation of this report presenting our findings, conclusions, and recommendations. <br /> <br /> <br />