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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), four wells within a half-mile radius of the subject Site have been tested for nitrate. Nitrate was detected in all four of these wells at concentrations between 0.1 and 5.0 mg/L-N. According to the DBCP map (Plate 10), four wells within a half-mile radius of the Site have been tested for DBCP; it was not detected in two of the wells, detected in one well between 0.01 and 0.2 ug/L, and detected in the final well over 0.2 ug/L. 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. The adjacent facility to the north of the Site, Victor meats, is the location of a closed leaking underground storage tank case. According to information available from GeoTracker, two underground diesel fuel tanks 8,000 and 12,000 gallons in size were removed from that facility in 2000; some contamination was found in the underlying soil. A "no further action" letter for the release was issued by the California Regional Water Quality Control Board, Central Valley Region, in 2005. The Victor Meats facility is also the known source of total dissolved solids (TDS) contamination to ground water. Two cases related to this contamination remain open at the California Regional Water Quality Control Board, Central Valley Region, but no specific information was available from GeoTracker. On-Site Wells tTwo industrial wells are currently located on the Site Tom Alexander, owner of California Concentrate, indicated that several domestic wells were located at 4664 East Clarksdale but were destroyed years ago. He also stated that monitoring wells'are located on the Site as part of California Concentrate's Waste Discharge Requirements through the California Regional Water Quality Control Board (personal communication, March 26, 2019). Seven well permits were identified for the Site from among the files of the San Joaquin County Environmental Health Department: • May 1987 permit for installation of monitoring well (18678 N. Highway 99). • August 1987 permit for installation of monitoring well (18678 N. Highway 99). • June 1992 permit for new domestic well (4664 E. Clarksdale). A 1992 letter from the California Regional Water Quality Control Board, Central Valley Region, was included with the permit; the letter notes that "the domestic well is directly upgradient of a salt plume emanating from Victor Fine Foods. The Property owner's pumping may pull the salt plume upgradient into the new well." Based on the 200-foot grout seal installed at the new well, the Regional Board allowed the operation of the well (4664 E. Clarksdale). LOGE 1912 Page 4