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Expected On-Site Maximum Septic Tank Usage Maximum expected septic usage on the Site would be from any future residential uses. No construction is planned at this time. Septic system design should be based on the On-Site Wastewater Disposal Standards (2003) 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 spring and fall of 2012 were the most recent available from this source. According to an analysis of these maps (Plates 5 and 6), ground water elevation ranges from approximately six feet below to five feet above mean sea level; ground water flows down to the southwest at a rate of approximately five to seven feet per mile in the vicinity of the Site. i1 Given that the ground elevation of the Site is approximately 27 to 30 feet, based on the County ground water maps the depth to ground water below the Site is estimated to range between 22 to 36 feet, depending on the season. 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. Live Oak reviewed the EHD's Water Well Data Table dated March 10, 2009 for nearby addresses that have been tested for nitrate and dibromochloropropane (DBCP). Five nearby wells were identified at addresses local d within approximately 1.5 miles of the Site. All of the wells were tested for DBCP. DBC wasnot_, etected in two wells; it was detected in the other three at concentrations of 0.07 t�pb (µg/Q. Three of the we est ed for nitrate as NO3; it was detected in all three at concentrations of 12.5 to mg/L. he Maximum Contaminant Level (MCL) set by the US EPA for rn ra a as NO3 isA4r� /L; the MCL for DBCP is 0.2 µg/L. On-Site Wells As indicated on the site map (Plate 3), one irrigation well exists on the Site. The San Joaquin County Environmental Health Department well permit records were searched for the Site address; no permits were identified. However, one permit which most likely LOGE 1401 Page 3