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16 Febuary 2022 Project No. 22-6747 Page 8 of 13 AdvanceIlGeo An Employee -Owned Company 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 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 The subject property does not have a potable water well. 8.1. DESCRIPTION OF LOCAL GROUNDWATER According to the State of California Department of Water Resources (DWR) Sustainable Groundwater Management Act (SGMA) Data Viewer, Seasonal Report for Spring 2021, depth to groundwater at the site is approximately 115 feet bsg. Between 2011 and 2019, depth to groundwater at the site has fluctuated between 105 and 125 feet bsg. Groundwater flow direction locally appears to be to the east. Groundwater was not encountered in the 42 -inch -deep percolation test hole advanced on 10 February 2022. 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 DTSC EnviroStor Database and the Geotracker Web site did not reveal any LUST sites within 0.5 miles of the site. The review did not reveal any other sites of environmental concern within a half -mile radius of the site. Based on the information reviewed, there is no existing or known groundwater contamination at the site and the potential for groundwater contamination is de minimis. 8.3. CURRENT AND FUTURE USE OF GROUNDWATER AT THE SITE The subject property does not have a potable water well. A potable water well will be installed during the construction of the new residence.