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Septic Permit History in the Vicinity Based on a review of septic permits on file at the San Joaquin County Environmental Health Department for nearby properties, most septic systems in the area utilize leach lines only; one permit indicated leach lines with sumps. The septic permits can be found in Appendix 4 of this report. Expected On-Site Maximum Septic Tank Usage Maximum expected usage on the Site would be from the current and future residents of the Site. The new septic system design should be based on the San Joaquin County On-Site Wastewater Treatment Systems Standards (2017) or other engineering recommendations. Ground Water Information Depth and Gradient Live Oak reviewed ground-water elevation information available from the San Joaquin County Flood Control and Water Conservation District to determine the ground-water levels near the Site. Data from the fall of 2024 and spring of 2025 were the most recent available from this source. According to an analysis of these maps (Plates 5 through 8), depth to water in the area is approximately 58 feet. Ground water appears to flow generally to the northwest in the area at a rate of approximately 3.5 feet per mile. Potential Ground Water Contamination Issues The Soil Suitability Study is not intended to be an investigation into ground-water contamination sources, and no such investigation was conducted. Many sources can contribute to ground-water contamination, including leaking underground storage tanks, agricultural activities, dairies, septic systems, and storm water infiltration. Agricultural activities and the use of septic systems in the area are known ground-water contamination sources with the potential to impact the Site. Two common ground-water contaminants in San Joaquin County are nitrate and dibromochloropropane (DBCP). Live Oak reviewed the San Joaquin County Environmental Health Department's maps of Nitrate — Land Use Data and DBCP— Land Use Data dated October 2021. According to the nitrate map (Plate 9), three wells within a one-mile radius surrounding the subject Site have been tested. Nitrate was detected in two of the wells at concentrations between 0.1 and 5.0 mg/L-N and in the remaining well at a concentration between 5.1 and 10.0 mg/L-N. Two wells within a one-mile radius surrounding the Site were tested for DBCP (Plate 10). DBCP was detected in one well at a concentration over 0.2 µg/L; no DBCP was detected in the other well. LOGE 2619 Page 3