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Lopez Property March 2014 <br /> 1601 French Camp Turnpike, Stockton <br /> Claim No: 18245 <br /> Most Recent Concentrations of Petroleum Constituents in Groundwater <br /> Sample Sample TPHg Benzene Toluene Ethyl- Xylenes MTBE 1,2 <br /> Date (Ng/L) (Ng/L) (Ng/L) Benzene (Ng/L) (Ng/L) DCA <br /> Aigili-) /L <br /> -MW-1 09/04/13 28,000 110 1,200 140 2,530 <1 14 <br /> WW-2 12/06/12 120 <0.5 4.8 1.6 10.6 NA <0.5 <br /> -MW-3 06/29/12 260 <0.5 2.3 4.6 20.3 NA NA <br /> MW4 12/06/11 140 <0.5 8.6 2.1 26.4 NA NA <br /> MW5 09/04/13 190 <0.5 <0.5 <0.5 <0.5 <1 <0.5 <br /> MW6 09/04/13 <60 <0.5 <0.5 <0.5 <0.5 <1 <0.5 <br /> MW7 12/07/09 <60 <0.5 <0.5 <0.5 <0.6 NA <0.5 <br /> MW8 09/04/13 1,000 87 28 6.3 11.9 <1 2.2 <br /> MW9 06/29/12 <50 <0.5 <0.5 <0.5 <0.6 NA NA <br /> MW10 09/04/13 5,000 680 57 52 82 <1 18 <br /> MW11 09/04/13 320 8.4 <0.5 <0.5 <0.5 <1 16 <br /> MW12 06/29/12 <50 <0.5 <0.5 <0.5 <0.6F <1 I <0.5 <br /> VVQOs 1 51 0.151 4ZI 29 17 1 51 0.5 <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 /> 1,2 DCA: 1,2 Dlcholoroethane <br /> WQOs: Water Quality Objectives,Regional Water Board Basin Plan <br /> Groundwater Trends <br /> Since 2004, 12 groundwater monitoring wells have been installed and monitored. Benzene <br /> trends are shown below: Source Area (MW-1) and Downgradient (MW-8A). <br /> Source Area Well <br /> BENZENE Results for MW1 <br /> 16000 <br /> 14000 <br /> 12000-. _• _ -_.___ <br /> 10000 <br /> 8000 <br /> 6000 <br /> 4000- <br /> 2000 - - - "--- <br /> 0 <br /> aw BENZENE •..m Trend <br /> Page 8 of 13 <br />