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20 January 2021 Project No. 20-6284 Page 6 of 14 AdvancedGeo An Employee-Owned CCompony at the site has fluctuated between 80 and 110 feet bsg. Groundwater flow direction locally appears to be to the north-northeast. Groundwater was not encountered in the 42 -inch - deep percolation test hole advanced on 14 January 2021. 4.2. GROUNDWATER CONTAMINATION IN THE AREA OF THE SITE The immediately adjacent and outlying land use for the parcel is agricultural and residential, and the adjacent property to the west and south is developed with the Collegeville Elementary School. 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 underground storage tank (LUST) site within a 0.5 -mile of the subject property. However, the LUST site has been closed for over 15 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 Liquid waste septic permits dating back to October 1963 indicate a domestic water well located on the property. There are four well permits on file with EHD for the subject property for well pump replacement dated October 1979, July 1982, August 1988, and July 1998 (Appendix B). There are no additional records on file at EHD or the Department of Water Resources with well construction or installation information. The onsite domestic water well will provide potable water to the planned development. The onsite water well was not sampled during this Study because there is currently no power to the site or well 5.0. SOIL PROFILE An OWTS Permit was issued for the property by the EHD on 31 December 2020 to perform a percolation test (Appendix C). On 14 January 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.