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15 November 2019 AdvancedGeo AGE Project No. 19-4912 Environmental Page 9 of 14 �1 7.2. MASS TRANSPORT PROPERTIES OF UNDERLYING SITE SOILS The percolation test and dominant soil type at the site indicates that the soils are semi- permeable to permeable and have moderate water storage. These soils will allow moderate infiltration of water through the surface soils. The longer the effluent remains near the surface, the more treatment is enhanced due to natural processes within the soil. If the permeable soils exist to the depth of the groundwater table, it is possible that surface contaminants may be transported fairly rapidly. 8.0. GROUNDWATER ANALYSIS There is currently no potable water source supplied to the subject property. A domestic water well is planned to be installed to the east of the proposed residence and will provide potable water to the residence and property. 8.1. DESCRIPTION OF LOCAL GROUNDWATER According to the San Joaquin County Flood Control and Water Conservation District's Lines of Equal Depth to Groundwater Fall 2018 and the DWR Water Data Library, depth to groundwater at the site is approximately 25 to 30 feet bsg. Between 2011 and 2018, depth to groundwater at the site has fluctuated between 20 and 30 feet bsg. Groundwater flow direction locally appears to be toward the northeast. Groundwater was not encountered in the 42-inch deep percolation test hole advanced on 13 November 2019 8.2. EXISTING OR POTENTIAL GROUNDWATER CONTAMINATION The immediately adjacent and outlying land use for the parcel is residential, agricultural and vacant. Potential groundwater contamination can occur from several sources including leaking underground storage tanks, septic systems, agricultural activities, dairies, and stormwater infiltration. A review of the DTSC EnviroStor Database and the Geotracker Web site did not reveal any sites of environmental concern within a 0.5-mile radius of the site. 8.3. CURRENT AND FUTURE USE OF GROUNDWATER AT THE SITE There is currently no potable water source supplied to the subject property. A domestic water well is planned to be installed to the east of the proposed residence and will provide potable water to the residence and property.