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Soil Suitability Evaluation Page 4 of 18 <br />Austin Road Mini Storage <br />183 South Austin Road, Manteca, California <br />December 13, 2021 NATS Job # 22-282G <br />of an old well cannot be precluded. <br />4.0 FIELD INVESTIGATION <br />A preliminary field investigation, conducted on November 17th, 2021, which included <br />site reconnaissance, mapping of surficial site deposits, and the excavation of a <br />percolation test hole (designated "P-1") to a maximum depth 36 inches. Pre -saturation <br />of the test hole was performed on November 18" to 19th, 2021 and percolation testing <br />was performed on November 19th, 2021. The test hole was excavated using a hand <br />operated post -hole shovel to 6 -inch diameter. Soils were logged in the field by a NATS <br />Field Geologist and were classified according to the Unified Soil Classification System <br />(ASTM D2487) based on field testing, and visual observations. <br />5.0 GROUNDWATER <br />No free groundwater was encountered in the percolation test hole to the maximum <br />explored depth of 36 -inches below ground surface (beg). Based on the California <br />Department of Water Resources Sustainable Groundwater Management Act (SGMA) <br />Data Viewer https://sgma.water.ca.gov/webgis/?appid=SGMADataViewer#gwleveIs), <br />recent groundwater depth in the vicinity of the site is indicated to be on the order of <br />38± feet beg (spring 2021) with a 10 year high of 23± feet beg in 2012. <br />6.0 SOIL PROFILE <br />Regional geologic mapping by Wagner, et al. (1981) indicates the near surface geologic <br />unit that generally comprises the subsurface of the site consists of Holocene dune sand. <br />4713 ENTERPRISE WAY * SUITE 4 * MODESTO * CALIFORNIA * 95356 * 209-545-1 I03 <br />