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GEOTECHNICAL <br /> ENVIRONMENTAL <br /> COASTAUMARITIME <br /> ENGEO WATER RESOURCES <br /> Expect Excellence CONSTRUCTION SERVICES <br /> Project No. <br /> 19113.000.001 <br /> December 3, 2021 <br /> Mr. Bill Peterson <br /> Managing Director <br /> Denmar US <br /> 294 E. Ocean Boulevard, Suite 212 <br /> Long Beach, CA 90802 <br /> Subject: American Soda Ash Terminal at Port of Stockton <br /> Stockton, California <br /> PRELIMINARY DEWATERING ANALYSIS <br /> References: 1. ENGEO; Geotechnical Engineer of Record Report, American Soda Ash <br /> Terminal at Port of Stockton, Stockton, California; Project No. 19113.000.001; <br /> October 15, 2021; Draft. <br /> 2. Gannett Fleming; Geotechnical Data Report Denmar Port of Stockton West <br /> Complex Soda Ash Export Terminal Project, Stockton, California; Project No. <br /> 067670; January 29, 2021. <br /> 3. Gannett Fleming; Seepage into Railcar Unloading Building Excavation During <br /> Construction, Denmar Port of Stockton West Complex Soda Ash Export <br /> Terminal, Stockton, California; Project No. 067670; February 1, 2021. <br /> 4. California Department of Water Resources; Guidance Document for <br /> Geotechnical Analyses, Urban Levee Evaluations, Project Contract <br /> 4600008101; April 2015. <br /> Dear Mr. Peterson: <br /> We prepared this letter to provide results of our preliminary dewatering evaluation for the Railcar <br /> Unloading Building construction. We understand that the Railcar Unloading Building will be <br /> constructed in the eastern part of the site in a currently undeveloped part of Rough and Ready Island. <br /> The existing grade in this area is approximately Elevation 0 feet, North American Vertical Datum of <br /> 1988 (NAVD88). The grade will be raised to accommodate a rail embankment and a pre-engineered <br /> metal building over 30 feet tall will be constructed over the embankment. The building will have <br /> below-grade construction to accommodate collection of bulk soda ash that will be bottom dumped <br /> from the rail cars and transferred to a conveyor system. The building will have two levels of <br /> below-grade construction. The first below-grade level will be oriented perpendicular to the rail <br /> embankment and above-grade building and will have approximate dimensions of 36 feet wide by <br /> 200 feet long; the floor of this level will be around Elevation -9.5 feet in preliminary plans. The second <br /> below-grade level will be oriented perpendicular to the levels above and have a finished floor around <br /> Elevation -23.5 feet and be connected to an approximately 230-foot-long, 13.5-foot-tall by <br /> 15-foot-wide conveyor tunnel that slopes up to the ground surface. <br /> 17278 Golden Valley Parkway, Lathrop CA 95330 • (209)835-0610• Fax(888)279-2698 <br /> www.engeo.com <br />