SR0085125_SSNL - Laserfiche WebLink

Home Browse Search

Expected On-Site Maximum Septic Tank Usage Maximum expected usage on the Site would be from the current and future residents of the Site. 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 2018 and the spring of 2019 were the most recent available from this source. According to an analysis of these maps (Plates 4 and 5), ground water elevation is approximately 30 to 50 feet below mean sea level. Ground water appears to flow to the north or southeast in the general area, depending on the season; the flow rate could not be calculated because the Site is so close to the edge of the mapped area. Given that the ground elevation of the Site is approximately 107 to 108 feet above mean sea level, the depth to water below the Site is estimated to be approximately 137 to 158 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. 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 (Plates 6 and 7). According to the nitrate map, eleven wells within a one-mile radius of the subject Site have been tested for nitrate. Nitrate was detected at concentrations between 0.1 and 5.0 mg/L-N in all eleven. According to the DBCP map, eight wells within a one-mile radius of the Site have been tested for DBCP. DBCP was detected at a concentration between 0.01 to 0.2 [A g/L in one of the wells and at a concentration over 0.2 tA g / L in one of the wells; no DBCP was detected in the remaining six wells. LOGE 2219 Page 3