2130 E 4th St - REV 1 - Plan - Laserfiche WebLink

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EARTH STRATA GEOTECHNICAL SERVICES 4 March 30, 2023 Project Number 234812-10A sediments consisting of alluvial deposits, sandstones, claystones, siltstones, conglomerates, and occasional volcanic units. A map illustrating the regional geology is presented on the Regional Geologic Map, Figure 2. Local Geology The earth materials on the site are primarily comprised of artificial fill and Quaternary alluvial materials. A general description of the dominant earth materials observed on the site is provided below: • Artificial Fill, Undocumented (map symbol Afu): Undocumented artificial fill materials were encountered throughout the site within the upper 4 to 6 feet during exploration. These materials are typically locally derived from the native materials and consist generally of brown silty sand. These materials are generally inconsistent, poorly consolidated fills. • Quaternary Young Alluvial Fan Deposits (map symbol Qyf): Quaternary young alluvial fan deposits were encountered below the artificial fill to the maximum depths explored. These young alluvial deposits consist predominantly of interlayered brown to gray, fine to coarse grained silty sand, sandy silt, sandy clay, poorly graded sand and poorly graded gravel. These deposits were generally noted to be in a slightly moist to moist, loose to medium dense state. 2130 E 4th St 2/11/2025