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01 October 2019 AdvancedGeo AGE Project No. 19-4850 Environmental Page 9 of 14 2.0 millimhos per centimeter (mmhos/cm). Clays and loams in Jacktone-Urban 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 and have low water storage. These soils will allow low to 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 The subject property is supplied with potable water by the California Water Service Company. The water supply was not sampled as part of this study. 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, depth to groundwater at the site is approximately 35 to 40 feet bsg. Groundwater flow direction locally appears to be toward the north-northeast to the east. Groundwater was not encountered in the 42-inch deep percolation test hole on 17 September 2019. 8.2. EXISTING OR POTENTIAL GROUNDWATER CONTAMINATION The immediately adjacent and outlying land use from the parcel is miscellaneous, commercial and residential. 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 revealed eleven (11) LUST sites within a 0.5-mile of the subject property. However, ten (10) of the LUST sites have been closed for over ten years. The one open LUST (Nutrien AG Solutions- CPS) is located at 1905 North Broadway Avenue, approximately 2,200 feet north and down-gradient of the subject property. Based on the status of the LUSTs and their distance and direction from the subject property, the LUSTs 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.