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Super Center Mart April 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 TBA <br /> Date (Ng/L) (Ng/L) (Ng/L) Benzene (Ng/L) (Ng/L) (Ng/L) <br /> /L <br /> MW-1 12/20/13 24,000 460 99 530 1,200 12 <10 <br /> MW-2 12/20/13 27,000 1,500 280 1,700 3,270 19 <10 <br /> MW-3 12/20/13 24,000 300 45 290 1,360 48 <10 <br /> MW-4 12/20/13 <50 <0.5 <0.5 <0.5 <0.5 <1 <10 <br /> MW-5 12/20/13 <50 <0.5 <0.5 <0.5 <0.5 <1 <10 <br /> MW-6 12/20/13 14,000 1,400 73 150 282 64 <10 <br /> MW-7 12/20/13 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW-8a 12/20/13 600 <0.5 <0.5 <0.5 <0.6 95 <10 <br /> MW-8b 12/20/13 <50 <0.5 <0.5 <0.5 <0.5 <1 <10 <br /> MW-8c 12/20/13 140 24 <0.5 4.9 13 <1 <10 <br /> MW-8d 12/20/13 400 64 <0.5 2.9 9.2 <1 <10 <br /> MW-9a 11/28/12 78,000 1,300 1,300 2,200 2,900 97 <10 <br /> MW-9b 04/08/12 <50 <0.5 <0.5 <0.5 <0.5 <0.5 <10 <br /> MW-9c 04/08/12 <50 <0.5 <0.5 <0.5 <0.5 <0.5 <10 <br /> MW-9d 11/28/12 25,000 640 290 520 1,186 110 <10 <br /> MW-11 12/20/13 <50 <0.5 <0.5 <0.5 <0.6 1 <10 <br /> WQO - 1 51 0.15 42 _ 29 17 5 -- <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 /> Regional Water Board Basin Plan does not have a numeric water quality objective for TBA <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 /> Page 8 of 13 <br />