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02 March 2020 AdvancedGeo Project No. 20-5001 An Employte-Owned Company Page 6 of 14 toward the west-southwest. Groundwater was not encountered in the 42-inch deep percolation test hole advanced on 06 February 2020. 4.2. GROUNDWATER CONTAMINATION IN THE AREA OF THE SITE The immediately adjacent and outlying land use for the parcel is residential and commercial. 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 Department of Toxics and Substance Control (DTSC) EnviroStor Database and the Geotracker Web site revealed one (1) leaking fuel underground storage tank (LUST) site within a 0.5-mile of the subject property. However, the LUST site has been closed for over 20 years. Based on the status of the LUST and the distance and direction from the subject property, the LUST 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. 4.3. ON-SITE EXISTING WELL DESCRIPTION There are no existing water wells at the subject property that are in use. There is one abandoned, out-of-service well on the property. 5.0. SOIL PROFILE An OWTS Permit was issued for the property by the EHD on 31 January 2020 to perform a percolation test (Appendix C). On 06 February 2020, a 4-inch diameter hand auger was utilized to advance a percolation test hole to 42 inches bsg, in the proposed septic system disposal field area. A plan of the specific site features including the percolation test hole locations (i.e., structures, drives, wells, septic systems, large trees, pastures, pools, natural drainage courses, ponds, waterways, etc.) is illustrated in Figure 2. 5.1. SOIL PROFILE PIT INCLUDING DEPTH AND DIMENSIONS The percolation test hole was located in the disposal field area of the proposed septic system. The percolation test hole was advanced to a depth of 42 inches bsg using a four- inch diameter hand auger (Figure 2).