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T <br /> Soil Suitability and Nitrate Loading Evaluation-DRAFT Page 4 of 18 <br /> Great Pacific Nut—Nut Processing Facility Expansion <br /> 3501 Lehman Road, Tracy, California <br /> May 15, 2019 CTE Job#25-071OG <br /> The borings for this study were drilled using a truck-mounted Simco 2400 SK-1 drill rig <br /> utilizing 6-inch diameter solid flight auger. The maximum explored depth of these <br /> borings was 25.0± feet below existing ground surface (begs). Soils were logged in the <br /> field by a CTE Field Geologist and were classified according to the Unified Soil <br /> Classification System (ASTM D2487) based on field testing, and visual observations. <br /> Exploration logs prepared for the previous study provide soil descriptions, field in-situ <br /> test results, and blow count(N)data. <br /> 5.0 GROUNDWATER <br /> Observations of groundwater conditions were made in the test borings at the time of field <br /> exploration. Groundwater was observed in the Boring (B-GW) located at/near the <br /> proposed disposal field at approximaty 13 feet below fisting ground surface (begs). <br /> Based on information contained on the ' o roundwater Information Center Map <br /> site (https:Hgis.water.ca.gov/app/gicima/), ground water level has typically been deeper <br /> than about 110 feet bgs between 2011 and 2018, therefore, the relatively shallow <br /> groundwater observed in our subsurface explorations may represent a perched condition <br /> from the recent heavy winter rains. <br /> 6.0 SOIL PROFILE <br /> As stated previously, five subsurface borings were drilled, logged and sampled during our <br /> previous geotechnical study to a maximum depth of 21.5± feet below existing ground <br /> surface (bgs). Those borings are attached for reference to help access the subsurface soil a <br /> and groundwater profile below the site. Native alluvial deposits encountered within the <br /> borings (B-1, -2, -3, -4 & -5) generally consisted of medium stiff to stiff silts (ML)within <br /> the uppermost 7± feet. These deposits are underlain by very loose to medium dense <br /> poorly graded coarse sand with fines (SP/SM) to an approximate depth of 14 feet bgs. <br /> Stiff silty clays (CL) underlie the poorly graded to silty sands to the maximum depth <br /> explored of approximately 21.5 feet below existing ground surface. <br /> The percolation test holes (P-1, -2 & -3) encountered similar soil profile as indicated <br /> above, with exception of stiff clay (CL)which was encountered within the uppermost 6-8 <br /> SACRAMENTO - FREMONT - MODESTO <br /> INSPECTION&TESTING-GEOTECHNICAL-ENVIRONMENTAL-CONSTRUCTION ENGINEERING <br />