SU0011811 SSNL - Laserfiche WebLink

Home Browse Search

• 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, it appears that most septic systems in the area utilize leach lines or 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 septic usage on the Site would be from potential, future, primary and second unit dwellings on each numbered parcel. No construction is planned. 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 spring and fall of 2016 were the most recent available from this source (Plates 5 and 6). According to an analysis of these maps, the ground-water elevation ranges from approximately 10 to 43 feet above mean sea level; the ground-water flow is to the east or north at a rate of approximately seven to 18 feet • per mile, depending on the season. Live Oak considered 13 locations on the Site where the ground elevation is clearly mapped. By comparing these elevations with the ground-water elevations depicted in the spring and fall maps for the same locations, Live Oak determined that the depth to water beneath the Site may range from 13 to 55 feet, depending on the season and location on the Site. Ground water appears to be shallowest along the eastern side of the Site. 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 and cattle ranches, 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. Live Oak reviewed the San Joaquin County Environmental Health Department's Water Well Data Table dated March 10, 2009 for nearby addresses that have been tested for nitrate and dibromochloropropane (DBCP). Four wells were identified at addresses within approximately two miles of the subject Site. Only two of the wells had been tested for DBCP; it was not detected in either of the samples. All four wells had been tested for nitrate; it was detected in three of the four, at concentrations of 29.4 to 42.2 LOGE 1811 Page 3