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Super Center Mart January 2014 <br /> 701 East Charter Way, Stockton <br /> Claim No: 12741 <br /> Most Recent Concentrations of Petroleum Constituents in Groundwater <br /> Sample Sample TPHg Benzene Toluene Ethyl- Xylenes MTBE <br /> Date (Ng/L) (Ng/L) (Ng/L) Benzene (Ng/L) (Ng/L) <br /> /L <br /> MW-1 11/28/12 34,000 650 1,200 680 2,980 32 <br /> MW-2 11/28/12 4,000 1,200 1,200 12 115 12 <br /> MW-3 11/28/12 30,000 800 83 180 530 21 <br /> MW-4 04/08/12 <50 <0.5 <0.5 <0.5 <1 <0.5 <br /> MW-5 11/28/12 260 <0.5 <0.5 <0.5 9.1 <0.5 <br /> MW-6 11/28/12 5,000 170 5.3 <0.5 16 21 <br /> MW-7 04/08/12 <50 <0.5 <0.5 <0.5 <1 <0.5 <br /> MW-8a 11/28/12 1100 4.7 <0.5 <0.5 <1 <0.5 <br /> MW-8b 04/08/12 <50 <0.5 <0.5 <0.5 <1 <0.5 <br /> MW-8c 04/08/12 <50 <0.5 <0.5 <0.5 <1 <0.5 <br /> MW-8d 11/28/12 420 21 <0.5 4.1 9.4 <0.5 <br /> MW-9a 11/28/12 78,000 1,300 1,300 2,200 2,900 97 <br /> MW-9b 04/08/12 <50 <0.5 <0.5 <0.5 <1 <0.5 <br /> MW-9c 04/08/12 <50 <0.5 <0.5 <0.5 <1 <0.5 <br /> MW-9d 11/28/12 25,000 640 290 520 1,186 110 <br /> MW-11 04/15/13 300 72 <0.5 <0.5 <1.2 1.5 <br /> WQO - 5 0.15 42 29 17 <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 /> WQOs: Water Quality Objectives, Regional Water Board Basin Plan <br /> °: California Department of Public Health, Response Level <br /> Groundwater Trends <br /> Since 1998, 16 groundwater monitoring wells have been installed and monitored. Benzene trends <br /> are shown below: Source Area, Shallow (MW-3 and MW-9A) and Source Area Deep (MW-9B), <br /> and Downgradient (MW-4). <br /> Source Area Well (Shallow) <br /> BENZENE Results for MW3 <br /> 120000 <br /> 100000 <br /> 80000 <br /> ;;7 80000 <br /> 40000 - - <br /> 20000 <br /> 0 <br /> lode <br /> BENZENE ti Trend <br /> Page 9 of 13 <br />