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Weldon Church Residence December 2013 <br /> 104 West Beverly Place, Tracy <br /> Claim No: 8502 <br /> Most Recent Concentrations of Petroleum Constituents in Groundwater <br /> Sample Sample TPHg Benzene Toluene Ethyl- Xylenes <br /> Date (Ng/L) (Ng/L) (Ng/L) Benzene (Ng/L) <br /> (N /L) <br /> MW-1 08/02/12 <50 <0.5 <0.5 <0.5 <0.6 <br /> MW-2 01/25/12 <50 <0.5 <0.5 <0.5 <0.6 <br /> MW-3 01/25/12 <50 <0.5 <0.5 <0.5 <0.6 <br /> MW-4 08/02/12 1,900 12 2.4 14 7.3 <br /> MW-5 01/25/12 <50 <0.5 <0.5 <0.5 <0.6 <br /> MW-6L 01/25/12 <50 <0.5 <0.5 <0.5 <0.6 <br /> MW-6U 01/25/12 <50 <0.5 <0.5 <0.5 <0.6 <br /> MW-7 08/02/12 <50 <0.5 <0.5 <0.5 <0.6 <br /> MW-8 08/02/12 <50 <0.5 <0.5 <0.5 <0.6 <br /> WQOs - 1 5 1 0.15 42 29 17 <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 /> WQOs: Water Quality Objectives, Regional Water Board Basin Plan <br /> Groundwater Trends <br /> • Since 1996, nine groundwater monitoring wells have been installed and monitored. Benzene <br /> trends of select wells are shown below: Source Area (MW-1) and Downgradient (MW-8). <br /> Source Area Well <br /> BENZENE Results for MW1 <br /> 300 <br /> 250 <br /> -200 <br /> C� <br /> 150 - --- <br /> 75 <br /> N <br /> N <br /> 100 <br /> I <br /> Q1 <br /> ', ,�",p �T,.g".� is y r�yase ar=•. <br /> lie <br /> - BENZENE •sw. Trend <br /> Page 9of12 <br />