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Harry's Auto Mart �"� �"� November 2013 <br /> 2662 North Wilson Way, Stockton <br /> Claim No: 15094 <br /> Most Recent Concentrations of Petroleum Constituents in Groundwater <br /> Sample Sample TPHg Benzene Toluene Ethyl- Xylenes MTBE TBA <br /> Date (ug/L) (pg/L) (Ng/L)` Benzene (Ng/L) (Ng/L) (ug/L) <br /> (N /L) <br /> MW1 06/28/13 14,000 200 210 410 930 8 <10 <br /> MW2 06/28/13 <50 <0.5 <0.5 <0.5 <1 <1 <10 <br /> MW3 12/20/12 <50 <0.5 <0.5 <0.5 <1 <1 <10 <br /> MW4 06/28/13 1,200 <0.5 <0.5 <0.5 6.7 <1 <10 <br /> MW5 11/30/11 <50 <0,5 <0.5 <0.5 <1 <1 <10 <br /> MW6 11/30/11 <50• <0.5 <0.5 <0.5 <1 <1 <10 <br /> MW7 11/30/11 <50 ., <0.5 <0.5 <0.5 <1 <1 <10 <br /> MW1 D 06/28/13 <W <0.5 <0.5 <0.5 <1 <1 <10 <br /> WQOS - 51 . 0.15 42 29 17 5 1,200a <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 tent-butyl ether <br /> TBA: Tert-butyl-alcohol <br /> WQOs: Water Quality Objectives, Regional Water Board Basin Plan <br /> a: California Department of Public Health, Response Level <br /> Groundwater Trends <br /> • This Site has been monitored regularly since 2001. Benzene trends are shown below: <br /> Source area (MW1) and Down gradient (MW2 and MW3). <br /> Source Area Well <br /> BENZENE Results for MW1 <br /> 350001 <br /> i 4 <br /> 30000 <br /> 25000 <br /> 20000 <br /> 15000(.. '"'"r,►. + <br /> OD <br /> toaa0 I, <br /> 1 t <br /> 5000 I I <br /> o-1 <br /> * .0% BENZENE Trend; <br /> Page 9 of 13 <br />