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Pack Car Wash March 2014 <br /> 4405 Pacific Avenue, Stockton <br /> Claim No: 12325 <br /> Sample Sample TPHg Benzene Toluene Ethyl- Xylenes MTBE TBA <br /> Date (pg/L) (pg/L) (pg/L) Benzene (pg/L) (pg/L) (pg/L) <br /> /L <br /> MW-15c 03/28/08 <60 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MWA5d 03/28/08 <60 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-16a 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-16b 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-16c 03/28/08 <60 I <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-16d 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-16e 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-17a 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-17b 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-17c 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-18a 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-18b 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-18c 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-18d 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-18e 03/28/08 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-19a 12/13/12 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-19b 12/13/12 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-19c 12/13/12 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> WQO - 5 0.15 42 29 17 5 1200° <br /> NA: Not Analyzed, Not Applicable or Data Not Available <br /> pg/L: Micrograms per liter, parts per billion <br /> <: Not detected at or above stated reporting limit <br /> TPHg: Total petroleum hydrocarbons as gasoline <br /> MTBE: Methyl tert-butyl ether <br /> TBA: Tert-butyl alcohol <br /> WQOs: Water Quality Objectives, Regional Water Board Basin Plan <br /> °: California Department of Public Health, Response Level <br /> Groundwater Trends <br /> • Since 1997, 19 groundwater monitoring wells (some are multi-chambered) have been <br /> installed and monitored. Benzene trends are shown below: Source Area (MW2), Near <br /> Downgradient (MW6) and Far Downgradient(MW10a). <br /> Page 10 of 15 <br />