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GEOTECHNICAL <br />ENVIRONMENTAL <br />WATER RESOURCES <br />CONSTRUCTION SERVICES <br />COASTAL/MARINE GEOTECHNICS <br /> <br />2633 Camino Ramon, Suite 250  San Ramon, CA 94583  (925) 866-9000  info@engeo.com <br />www.engeo.com <br />Project No. <br /> 9785.004.001 <br />April 16, 2024 <br />Latest Revision October 31, 2025 <br /> <br />Mr. Steve Reilly <br />330 Land Company, LLC <br />16381 Scientific Way <br />Irvine, CA 92618 <br />Subject: Arroyo Lago <br /> Unincorporated Alameda County, California <br /> <br /> DESIGN-LEVEL GEOTECHNICAL REPORT <br /> <br />Dear Mr. Reilly: <br /> <br />As requested, we completed this design-level geotechnical exploration for the proposed Arroyo <br />Lago development along Busch Road in Unincorporated Alameda County, adjacent to the City of <br />Pleasanton’s eastern city limits. The proposed project will include a residential community <br />comprising of 194 lots with associated paved roads, open park spaces, improvements, and <br />retaining walls. We have characterized the subsurface conditions at the site to provide the <br />enclosed geotechnical report presenting our conclusions and design-level geotechnical <br />recommendations for the proposed development at the site. <br /> <br />It is our opinion from a geotechnical engineering viewpoint, that the site is suitable for the planned <br />development provided that the recommendations contained in this report are incorporated into <br />project design and implemented during construction. The main geotechnical concerns for the <br />planned site development include areas underlain by existing undocumented fill, expansive soil, <br />and seismic shaking. <br /> <br />Our findings indicate that the site is suitable for the proposed development provided the <br />recommendations and guidelines provided in this report are implemented during project planning, <br />design, and construction. We are pleased to have been of service to you on this project and are <br />prepared to consult further with you and your design team as the project progresses. <br /> <br />Sincerely, <br /> <br />ENGEO Incorporated <br /> <br /> <br /> <br /> <br />Justin Qiu, PE Jeanine Ruffoni, GE <br /> <br /> <br /> <br /> <br />Josef J. Tootle, GE <br /> <br />jq/jtr/jjt/dt