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California Stop September 2013 <br /> 2224 Manthey Road, Stockton <br /> Claim No: 18428 <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 /> (pq/L) <br /> MW-1 5/1/2013 4,200 <0.5 <0.5 <0.5 <0.5 7.6 34,000 <br /> MW-2 5/1/2013 11,000 <0.5 <0.5 <0.5 <0.5 5,100 36,000- <br /> -3 5/1/2013 1,100 <0.5 <0.5 <0.5 <0.5 11 16,000 <br /> MW-4 5/1/2013 <50 <0.5 <0.5 <0.5 <0.5 15 <10 <br /> MW-5 5/1/2013 <50 <0.5 <0.5 <0.5 <0.5 <1.0 <10 <br /> MW-6 5/1/2013 1,600 <0.5 <0.5 <0.5 <0.5 1,500 2,200 <br /> MW-7 5/1/2013 <50 <0.5 <0.5 <0.5 <0.5 9.2 <10 <br /> MW-8 5/1/2013 <50 <0.5 <0.5 <0.5 <0.5 <1.0 <10 <br /> MW-9 5/1/2013 <50 <0.5 <0.5 <0.5 <0.5 <1.0 <10 <br /> MW-10 5/1/2013 <50 <0.5 <0.5 <0.5 <0.5 <1.0 <10 <br /> MW-11 5/1/2013 <50 <0.5 <0.5 <0.5 <0.5 <1.0 <10 <br /> WQOs - 5 0.15 42 29 17 51 1,2008 <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 /> a: California Department of Public Health, Response Level <br /> Groundwater Trends <br /> • Since 2005, eleven groundwater monitoring wells have been installed and irregularly <br /> monitored. TBA trends are shown below: Source Area (MW2) and Downgradient (MW6). <br /> Source Area Well <br /> TERT-BUM ALCOHOL(TBA)Results for MW2 <br /> 180000 <br /> 140000 <br /> 120000 <br /> 100000 <br /> 80000 <br /> 60000 or�� <br /> 40000 <br /> s ' <br /> 200000 do/ <br /> • <br /> e• <br /> _- w TEM43UTYL ALCOMMfrIM) ---Trend <br /> Page 9 of 13 <br />