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Trans Sohal Logistics—Soil Suitability Section Page 4 of 13 Our Project Number: LGS140011 October 8,2014 1.4 Groundwater Information 1.4.1 Groundwater Depth and Gradient Groundwater was not encountered by the staff of Neil O. Anderson & Associates, Inc. during the drilling to a depth of 24 feet on September 16, 2014. Groundwater is therefore determined to be at a greater depth than 24 feet bgs. The San Joaquin County Flood Control and Water Conservation District (2013 and 2014) groundwater elevation maps were reviewed to determine the groundwater levels near the Site. The Spring 2013 and Spring 2014 depth to groundwater maps are the most current official maps available from groundwater lies h at approximately Groundwatere County 60 to65pfeet below) ground ng to e surface se s (bgs)• d Per the Department of Water Resources (DWR) Water Data Library irrigation well', approximately one- half mile north of the site, depth to groundwater was 63 feet in 2013. The approximate site elevation is 35 feet above mean sea level. The groundwater flow gradient is approximately 8 feet per mile to the northeast. 1.4.2 Potential Groundwater Contamination Issues Potential groundwater contamination can occur from a number of sources which often include leaking underground storage tanks, agricultural activities, dairies, septic systems, and storm water infiltration. Agricultural activities, industrial activities, and the use of septic systems in the area should be considered potential groundwater contamination sources. The concerns for groundwater contamination in this area are deemed moderate due to the depths involved. 1.4.3 Water Sample Location No water wells exist on the site. There were no permits found during a recent file review at EHD for the address of 2454 Teepee Drive. Furthermore, groundwater will not be a source of 613 drinking water for the project or general area in the future. For this reason, a water sample was not collected for testing of DBCP or Nitrate. 1.5 Soil Profile and Geologic Information The Site is depicted on the Geologic Maps of the Sacramento-San Joaquin Delta, California, as within the Alluvium-of-Calaveras nd Vicinity2. These Holocene to Upper Pleistocene soils consist of a mix of gravel, sand, silt and c y (Plate 5). The surface and- near surface soils located at the Site are reported by the UC Davis Soil Resources Laboratory (Plate 6) to be composed a Urban la—hil, consisting of built up land occupying more than 85 percent of the surface. The tandsLape-fs therefore too altered to lend feasible identification to detailed soil description or profile (USDA, 1992). 1 http://www.water.ca.gov/waterdatatibrary/Groundwater level station local well I.D.02N07E3E001 Z USGS.Atwater, B.F. Geologic Maps of the Sacramento-san Joaquin Delta,California,Sheet 17. MF 14-01. 1982. 1:24,000. ©2014 Neil O.Anderson&Associates,Inc. A Terracon Company