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<br />2020 Challenger Drive, Suite 103 | Alameda, California 94501 | p. 510.343.3000 | www.ninyoandmoore.com
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<br />February 12, 2025
<br />Project No. 403620002
<br />Ms. Mary Bean
<br />FirstCarbon Solutions
<br />1350 Treat Boulevard, Suite 380
<br />Walnut Creek, California 94597
<br />Subject: Update Geotechnical Review
<br />Hidden Canyon Residences and Preserve
<br />Dublin Canyon Road
<br />Pleasanton, California
<br />Dear Ms. Bean:
<br />In accordance with your request, we have performed a geotechnical review of additional documents
<br />for the proposed Hidden Canyon Residences and Preserve project in Pleasanton, California. The
<br />purpose of our review was to provide an opinion regarding whether the consultant, Cornerstone
<br />Earth Group, has adequately addressed issues regarding slope stability and provided adequate
<br />recommendations for preparation of the proposed residential building pads. Ninyo & Moore
<br />previously performed a review of geotechnical reports prepared by Cornerstone Earth Group, dated
<br />October 22, 2014, and October 9, 2017. Our conclusions and recommendations were presented in
<br />our Geotechnical Review letter, dated October 25, 2019. For this current study, we have been
<br />provided the following documents for our review:
<br />• Cornerstone Earth Group, 2020, Updated Preliminary Geotechnical & Geologic Report, Lester-
<br />Shriner Property Residential Development, Dublin Canyon Road, Pleasanton, California, dated
<br />March 31.
<br />• Cornerstone Earth Group, 2022, Geotechnical Response to Comments, Hidden Canyon –
<br />Lester/Shriner Property, Dublin Canyon Road, Pleasanton, California, dated May 3.
<br />• Ponderosa Homes, 2023, Project Description Overview, “Hidden Canyon”, Lester & Shriners
<br />Property, City of Pleasanton, Alameda County, California, dated March.
<br />• Ruggeri-Jensen-Azar, 2024, Vesting Tentative Map, Tract 8569 – Hidden Canyon (Lester and
<br />Shriner’s Property), City of Pleasanton, Alameda County, California, dated July 31.
<br />SITE AND PROJECT DESCRIPTION
<br />The site is located on the south side of Dublin Canyon Road, encompasses approximately 128
<br />acres of hillside property, and is comprised of two parcels known as the Shriner and Lester parcels
<br />JVin9o &~oore
<br />Geotechnical & Environmental Sciences Consultants
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