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Expected On -Site Maximum Septic Tank Usage Maximum expected usage on the Site would be from the staff of the proposed packing facility. 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 fall of 2018 and spring of 2019 were the most recent available from this source. According to an analysis of these maps (Plates 5 and 6), ground water elevation is approximately 20 to 24 feet below mean sea level; ground water flows down to the southeast at a rate of approximately 6 to 10 feet per mile. Given that the ground elevation of the Site is approximately 63 to 65 feet above mean sea level, the depth to water below the Site is estimated to be approximately 83 to 89 feet. 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. Records are on file for the subject Site at the San Joaquin County Environmental Health Department related to underground storage tanks at the former house. According to the records reviewed, a 1,000 -gallon leaded gasoline tank and a 200 -gallon gasoline tank were removed from the Site by Jim Thorpe Oil in 1997 under the oversight of San Joaquin County Public Health Services. A letter from Jim Thorpe Oil states that the 200 -gallon tank "was in extremely poor condition... There was no odor of gasoline or soil discoloration in the tank excavation area." These records have been included in Appendix 4. 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 February 20, 2019. According to the nitrate map (Plate 7), two wells LOGE 2221 Page 3