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30 July 2019 AdvancedGeo <br /> AGE Project No. 19-4772 Environmental <br /> Page 9 of 14 <br /> permeability of 0.06 to 0.20 inches per year (in/yr); and salinity of less than 2.0 millimhos <br /> per centimeter (mmhos/cm). Clays in the Capay Clay complex typically have the same <br /> chemical properties between surface grade and 60 inches bsg. <br /> 7.2. MASS TRANSPORT PROPERTIES OF UNDERLYING SITE SOILS <br /> The percolation test has revealed that the soils are semi-permeable. These soils will <br /> allow moderate infiltration of water through the surface soils. The longer the effluent <br /> remains near the surface, the more treatment is enhanced due to natural processes <br /> within the soil. If the permeable soils exist to the depth of the groundwater table, it is <br /> possible that surface contaminants may be transported fairly rapidly. <br /> 8.0. GROUNDWATER ANALYSIS <br /> The property is supplied with potable water by the city of Tracy. The city has provided' <br /> potable water to the property since 2007. The water supply was not sampled as part of <br /> this study. JI <br /> 8.1. DESCRIPTION OF LOCAL GROUNDWATER <br /> The San Joaquin County Flood Control and Water Conservation District's Lines of Equal <br /> Depth to Groundwater Spring 2018 indicates the depth to groundwater is approximately <br /> 40 feet below surface grade (bsg). Groundwater flow direction locally appears to be <br /> toward the southeast. Groundwater was not encountered in the 40-inch percolation test <br /> holes on 11 July and 23 July 2019. <br /> 8.2. EXISTING OR POTENTIAL GROUNDWATER CONTAMINATION <br /> The immediately adjacent and outlying land use for the parcel is residential; agricultural <br /> land use begins approximately 0.25 miles north of the property. A review of the California <br /> Department of Toxics and Substance Control (DTSC) EnviroStor Database and the <br /> Geotracker Web site did not reveal any sites of environmental concern within a half-mile <br /> radius of the site. Based on the information reviewed, there is no existing or known <br /> groundwater contamination at the site and the potential for groundwater contamination is <br /> de minimis. <br /> 8.3. CURRENT AND FUTURE USE OF GROUNDWATER AT THE SITE <br /> There are no immediate plans to use groundwater at the site. Potable water is currently <br /> supplied to the site by the city of Tracy. <br />