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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 7), three wells within a one-mile radius of the subject Site have been tested for nitrate. Nitrate was detected in two wells at concentrations between 5.1 and 10.0 mg/L-N, and in the other at a concentration over 10.0 mg/L (this data point may represent the water sample collected on the Site as part of the 2019 Nitrate Loading Study). According to the DBCP map (Plate 8), one well within the same area was tested. DBCP was not detected in the well. The Maximum Contaminant Level (MCL) set by the US EPA for nitrate is 10 mg/L- N; the MCL for DBCP is 0.2 pg/L. The Lima Dairy is located approximately 900 feet east and southeast of the Site. This facility has a wastewater pond and several unlined wastewater channels. According to an Investigation Summary prepared by Wallace-Kuhl & Associates (2015), thg _wastewater pond appears_ to be in direct contact with shallow ground water. v Additionally, "the rapid loss of surface water in channels adjacent to the Heifer pens raises a question of the potential presence of a dry well of other pathways that allows sface__water to_ rapidly reach shallow groundwater," according to the report. The Investigation Summary indicates that ground water has been impacted by nitrate and ammonia from the Lima facility. Another facility of interest in the area is the White Slough Water Pollution Control Plant, located approximately one-half mile south of the Site. On-Site Wells One domestic well is currently located on the Site. Five well permits were identified for the Site from among the San Joaquin County Environmental Health Department permit files: • November 2001 permit for out-of-service well. The address listed is 5920 W. Kingdon, a former address of the Site and several surrounding parcels that were recently subdivided. It is unclear whether the well is located on the current Site. • September 2002 permit for well destruction, 5920 W. Kingdon. This permit appears to refer to the same well as the previous permit. • November 2002 permit for new pump at domestic well, 5920 W. Kingdon. Based on the sketch included, this well appears to be located north of the current Site. • April 2004 permit for pump repair at irrigation well, 13950 N. Thornton. Based on the sketch included, this well appears to be located west of the Site. • May 2006 permit for pump replacement at irrigation well, 13950 N. Thornton. Based on the sketch included, this well appears to be located north of the current Site. These permits have been attached to this report. LOGE 20-02 Page 4