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29 May 2020 AdvancedGec Project No. 20-6014 An Employee-Owned Compan Page 9 of 14 � Vignolo silt loam land complex is composed of alluvium derived from mixed rock sources. Soils are described as moderately well drained; with a very low permeability; and salinity of less than 2.0 millimhos per centimeter (mmhos/cm). The Vignolo silt loam complex typically have the same chemical properties between surface grade and 60 inches bsg. 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 low 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 provided to the subject property. An out-of- service domestic water well is located at the 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 75 feet bsg. Between 2011 and 2018, depth to groundwater at the site has fluctuated between 75 and 115 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 21 May 2020. 8.2. EXISTING OR POTENTIAL GROUNDWATER CONTAMINATION The immediately adjacent and outlying land use for the parcel is residential and agricultural. 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 California DTSC EnviroStor Database and the Geotracker Web site revealed two (2) LUST site within a half-mile radius of the subject property. However, the LUST sites have been closed for over 14 and 23 years, respectively. Based on the status of the sites and the distance and direction from the subject property, the LUST sites should not impact the subject property. The review did not reveal any other sites of environmental concern within a half-mile radius of the site. Based on the information