SU0010340 SSNL - Laserfiche WebLink

Home Browse Search

Expected On-Site Maximum Septic Tank Usage Syj Maximum expected septic usage on the Site would be from the two existing duplexes. 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 2013 and spring of 2014 were the most recent available from this source. According to an analysis of these maps (Plates 5 and 6), ground water elevation is approximately 40 to 46 feet below mean sea level; ground water flows toward the east-southeast at a rate of approximately four to seven feet per mile in the vicinity of the Site. 1) Given that the ground elevation of the Site is 38 to 39 feet, the depth to water below the Site is estimated to be 78 to 85 feet, depending on the season and location on 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, septic systems, and storm water infiltration. Agricultural ! 2 activities and the use of septic systems in the area are known ground water contamination sources with the potential to impact the Site. 'z -2 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), common ground-water contaminants in San Joaquin County. Five wells were identified within approximately one-quarter mile of the Site. Nitrate as NO3 was detected in all of the wells at concentrations from 0.4 to 37.2 mg/L. Only one of the wells had been tested for DBCP; it was not detected. The Maximum Contaminant Level (MCL) set by the US EPA for nitrate as NO3 is 45 mg/L (equivalent to 10 mg/L nitrate as N); the MCL for DBCP is 0.2 µg/L. �" LOGE 1515 Page 3