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San Joaquin County Record Center - 3 - 6 May 2022 630 North California Street Stockton, San Joaquin County Table 1 - Maximum Petroleum Hydrocarbons in Soil (milligrams per kilogram m /k Constituent TPH-G TPH-D Benzene Toluene Ethyl- Total Naph 9,300 440 5,600 900 5,900 benzene Xylenes Maximum Detected 8,100 ' 790 37 370 200 780 <0.0050 TPH-G - Total petroleum hydrocarbons as gasoline TPH-D — Total petroleum hydrocarbons as diesel Naph - naphthalene Methyl tertiary butyl ether (MTBE), tert butyl alcohol (TBA), di -isopropyl ether (DIPE), ethyl tent -butyl ether (ETBE), tent -amyl methyl ether (TAME), 1,2-Dichloroethane (1,2 - DCA), or ethylene dibromide (EDB) were not detected above laboratory detection limits in soil. Groundwater - The maximum petroleum concentrations detected in groundwater beneath the Site are shown in Table 2. Table 2 - Maximum Petroleum Hydrocarbons in Groundwater (micrograms per liter /L TPH-G TPH-D Benzene Toluene Ethyl -benzene Total NaphXylenes 29,000 9,300 440 5,600 900 5,900 310 TPH-G - Total petroleum hydrocarbons as gasoline TPH-D — Total petroleum hydrocarbons as diesel Naph — Naphthalene The analytical results from the most recent 3 March 2020, groundwater sampling event are presented in Table 3. MTBE, DIPE, ETBE, TAME, TBA, 1,2-dichloethane, ethylene dibromide, ethanol, and methanol were not detected in groundwater beneath the Site during the most recent monitoring event. Table 3 - Most Recent Groundwater Analytical Results (lag/L) Well TPH-G TPH-D Benzene Toluene Ethyl- Total Naph benzene Xylenes MW -1 4,900 1,700 1.5 32 160 750 180 TPH-G - Total petroleum hydrocarbons as gasoline TPH-D — Total petroleum hydrocarbons as diesel Naph — Naphthalene RISK ASSESSMENT EVALUATION Condor concluded that the Site meets the State Water Resource Control Board's Low - Threat Underground Storage Tank Case Closure Policy's (LTCP) Petroleum Vapor Intrusion to Indoor Air criteria for petroleum hydrocarbon concentrations. Petroleum