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16475 TIDE ROAD Project No.2019-00072 Page 14 4.0 GROUNDWATER INFORMATION 4.1 Groundwater Depth and Gradient The San Joaquin County Flood Control and Water Conservation District(2016)groundwater reports were reviewed to determine the groundwater levels near the Site. The Fall 2016 and Spring 2016 maps are the most current official maps available from the County. According to these maps, (Plates 5 and 6) in Appendix A,groundwater elevation lies between 5 and 0 feet below mean sea level (msl) in the spring and fall,respectively. The elevation of the land,as previously mentioned in Section 1.1, is approximately 60 feet above mean sea level. Therefore, the depth to groundwater (the difference between the elevation of the Site and the elevation of groundwater), ranges between approximately 55 and 60 feet below the ground surface (bgs), depending on the season. The groundwater in the vicinity of the Site appears to flow to the north, toward a cone of depression during the spring, and north-northeast during the fall,at a gradient of approximately 10 feet per mile. No groundwater was encountered by the staff of Petralogix, Inc. during the percolation test hole auguring of the on September 11, 2019. 4.2 Potential Groundwater Contamination Issues No above- or below-ground off-site potential or known sources of contamination were identified from current uses of the surrounding properties,except for the following: • Surrounding properties are used for agriculture; agricultural chemicals may be applied to these properties. • The site and surrounding properties utilize septic systems. The site is located within an agricultural region; groundwater contamination can result from activities related to farming practices where chemicals are applied to crops which may permeate to groundwater.The site and surrounding properties utilize septic systems; leakage from septic tanks or failed septic systems can introduce bacteria to groundwater. 4.3 Water Sample Locations and Constituents There are no wells located on the parcel; no well water samples were obtained. 5.0 GEOLOGIC AND SOIL PROFILE INFORMATION The site is depicted on the Geologic Map of the San Francisco-San Jose quadrangle¢and falls within the Modesto Formation (Plate 3, Appendix A) herein called Qm. Qm is an alluvium derived unit derived from granitic sand,silt,and clay. The surface and near surface soils located at the site are reported by the San Joaquin County Soil Surveys to be composed of the Veritas fine sandy loam, 0-2 percent slopes (Plate 4, Appendix A). According to the USDA Natural Resources Conservation Service's Web Soil Survey,the Veritas sandy loam unit typically consists of fine sandy loam to 54 inches below ground surface followed by cemented conditions to 70 inches.The table below presents some selected properties of these soils: 4 Wagner,D.L.,Et.Al. Geologic Map the San Francisco-San Jose quadrangle,.2006. 5 United States Department of Agriculture.Soil Survey of San Joaquin County,California.October 1992. Petralogix Engineering,Inc. 26675 Bruella Road,Galt,Ca 95632 (209)-000-5729 www.petralogix.com