SU0008831_SSNL - Laserfiche WebLink

Home Browse Search

Expected On-Site Maximum Septic Tank Usage Maximum expected septic usage on the Site would be from the existing and 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 fall of 2010 and spring of 2011 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 18 to 22 feet above mean sea level; ground water flows down to the north at a rate of approximately five to six feet per mile in the vicinity of the Site. Given that the ground elevation of the Site is approximately 60 feet, based on the County ground water maps the depth to ground water below the Site is estimated to range between 38 to 42 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). Three nearby wells were identified at addresses located within approximately one and one- quarter miles of the Site. Two of the wells had been tested for DBCP; it was detected at levels of 0.15 and 0.82 parts per billion (ppb). Nitrate as NO3 was detected in all three wells at concentrations of 24 to 117 parts per million (ppm). The Maximum Contaminant Level (MCL) set by the US EPA for nitrate as NO3 is 45 ppm; the MCL for DBCP is 0.2 ppb. On-Site Wells As indicated on the site map (Plate 3) one d mestic water well and one irrigation water well exist on the Site. One weH was on file at the San Joaquin County LOGE 1135 Page 3