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those years, depth to water was approximately 14 feet in 1983 and 23 feet in 1999 (San Joaquin County Flood Control and Water Conservation District, 1983 and 1999). 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. According to the nitrate map (Plate 9), two wells within a half-mile radius of the subject Site have been tested. Nitrate was detected in one well at a concentration between 0.1 and 5.0 mg/L-N, and in the other well at a concentration between 5.1 and 10 mg/L-N. One well within a half-mile radius of the Site was tested for DBCP; no DBCP was detected (Plate 10). The Maximum Contaminant Level (MCL) set by the US EPA for nitrate is 10 mg/L-N; the MCL for DBCP is 0.2 ug/L. On-Site Wells Two domestic wells are currently located on the Site. One well serves the house and monastery; the other is currently inoperable. Two well permits were identified for the Site from among the files of the San Joaquin County Environmental Health Department: • April 2012 permit for pump replacement at domestic well near house. • June 2015 permit for new domestic well. The permit indicates that the well is 300 feet deep, with a grout seal at 200 feet. The Well Completion Report indicates that the soil strata encountered were primarily clay and sand. These permits have been included in Appendix 4 of this report. Water Sample Because the new domestic well is currently inoperable, Live Oak collected a water sample from the older domestic well on the Site on August 2, 2019. The sample was analyzed for nitrate and dibromochloropropane (DBCP) per San Joaquin County Environmental Health Department policy. LOGE 1938 Page 4