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GEoFORENSICS INC. Consulting Soil Engineering 303 Vintage Park Drive, Suite 220, Foster City, CA 94404 Phone. (650)349-3369 Fax: (650) 571-1878 File: 218267 November 30, 2018 Abergel Homes Attention: Ms. Natalie Cowan 74 Lilac Drive Atherton, CA 94025 Subject: Catalpa Drive Property 254 Catalpa Drive Atherton, California GEOTECHNICAL INVESTIGATION FOR PROPOSED NEW RESIDENCE Dear Ms. Cowan: In accordance with your authorization, we have performed a subsurface investigation into the geotechnical conditions present at the location of the proposed improvements. This report summarizes the conditions we measured and observed, and presents our opinions and recommendations for the design and construction of the proposed new residence. Site Description The subject site is a relatively level,rectangularly-shaped parcel located on the north side of Catalpa Drive (at the approximate location shown on Figure 1). For purposes of description in this report, it is assumed that the property faces east. The property is bounded by other developed single family residential lots to the north and west, a roadway off Catalpa Drive to the east, and Catalpa Drive to the south. The site is currently occupied by a one-story, wood-framed residence situated near the center of the lot. There is a detached garage north of the house. The wooden house floors are supported above crawlspace areas, while the garage has a concrete slab-on-grade floor. An asphalt driveway leads from the private roadway to the garage, and a parking area in front of the house. The ground surface in the site vicinity has an overall gentle slope down towards the north(as shown on Figure 2). At the site, the ground slopes gently to down towards the north and east. Surface gradients range from level to 20:1 (horizontal:vertical,H:V). During the original development of the property, it appears that little or no grading work was performed on the site. The grounds around the residence have been landscaped with a variety of small to medium sized bushes and shrubs, numerous small to large trees, and various native plants and grasses. A concrete walkway leads to the front entrance. A concrete walkways along the right side of the house leads to a rear concrete patio.