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P <br /> W <br /> Staliworth Auto Detail October 2013 <br /> 602 California Street W, Stockton <br /> Claim No : 12235 <br /> Most Recent Concentrations of Petroleum Constituents in Groundwater <br /> Sample Sample TPHg TPHd Benzene Toluene Ethyl- Xylenes MTBE TBA <br /> Date (pg/L) (pg/L) (pg/L) (pg/L) Benzene (pg/L) (pg/L) (Ng/L) <br /> (p /L <br /> MW1A 03/26/13 36,000 81900 90 35400 970 41600 < 1 <10 <br /> MW1B 09/11 /06 240,000 629000 35600 72,000 91000 385000 <10 <100 <br /> MW1C 03/26/13 <50 <50 <0.5 <0.5 <0 . 5 <0.6 <1 <10 <br /> MW1D 03/26/13 <50 <50 <0.5 <0. 5 <0. 5 <0. 6 <1 < 10 <br /> MW2 03/26/13 <50 <50 <0.5 <0. 5 <0. 5 <0.6 <1 < 10 <br /> MW3 03/26/13 <50 <50 <0.5 <0. 5 <0. 5 <0. 6 < 1 I < 10 <br /> MW4 03/26/13 <50 <50 <0.5 <0. 5 <0. 5 1 <0.6 < 1 < 10 <br /> MW5 03/26/13 <50 <50 <0.5 <0. 5 <0. 5 <0.6 < 1 <10 <br /> MW6 03/26/13 200 <50 <0.5 <0. 5 <0. 5 <0.6 < 1 <10 <br /> MW7 03/26/13 12,000 19100 290 16 41 35 <1 <10 <br /> MW8 03/26/13 130,000 170000 12,000 319000 31100 13,000 <1 < 10 <br /> MW9 03/26/13 <50 <50 <0.5 <0. 5 <0. 5 <0. 6 <1 < 10 <br /> MW10 07/19/12 31200 11100 210 40 78 130 < 1 < 10 <br /> MW11 03/26/13 55,000 8,400 6,000 41300 11600 85000 < 1 < 10 <br /> WQOs 5 56 0.15 42 29 17 5a 1 ,200 <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 /> TPHd: Total petroleum hydrocarbons as diesel <br /> MTBE: Methyl tert-butyl ether <br /> TBA: Tert-butyl alcohol <br /> WQOs: Water Quality Objectives, Regional Water Board Basin Plan <br /> a: Secondary maximum contaminant level (MCL) <br /> b: California Department of Public Health, Response Level <br /> Groundwater Trends <br /> • Since 1996 , fourteen groundwater monitoring wells have been installed and regularly <br /> monitored . Benzene trends are shown below: Source Area (MW1 ) and Downgradient <br /> (MW11 ) , <br /> Source Area <br /> BENZENE Results for MW1A <br /> 60000 <br /> 50000 - •' <br /> J40000 <br /> 20000 <br /> 10000 -- <br /> 01 <br /> a� <br /> La.� BENZENE Trend <br /> Page 8 of 12 <br />