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Comfort Air • <br /> 1607 Turnpike Road, S Dckton October 2013 <br /> Claim No: 15533 <br /> Most Recent Concent tions of Petroleum Constituents in Groundwater <br /> Sample Sample TPHg Benzene Toluene Ethyl- Xylenes MTBE TBA <br /> Date (Ng/L) (pg/L) (Ng/L) Benzene <br /> (N9/L) (N9/L) (N9/L) <br /> MW3 12/05/12 120 < < <br /> 2 0.5 <0.5 <0.5 <0.6 NA NA <br /> MW5 12/05/1 <50 < / t/D <br /> MW6 12/05/12 110 <0.5 <0.5 <0.5 <0.6 NA NA ;5 <br /> MW7 12/05/11 ' <50 <0.5 <0.5 <0.5 <p.g NA NA /Vo <br /> MW8A 06/28/12 < 0.5 <0.5 <0.6 NA NA <br /> MW8B 12/05/12 41900 <0.5 <0.5 <0.5 <O.g NA NA <br /> MW9B 530 13 6.5 49.7 NA <br /> 12/05/12 <50 < NA /5 <br /> MW10A 06/28/12 <50 <0.5 <0.5 <0.5 <0.6 NA NA <br /> MW106 10/13/08 <50 <0.5 <0.5 <0.5 <0,6 NA NA <br /> MW11A 12/05/12 <50 <0.5 <0.5 <0.5 <0.6 <1 <10 <br /> MW116 12/05/12 300 <0.5 <0.5 <0.5 <0.6 NA NA MO <br /> MW12A 12/05/12 <50 <0.5 <0.5 <0.5 <O.g NA NA %9 <br /> MW126 10/13/08 <60 <0.5 <0.5 <0.5 <0.6 NA NA N D <br /> MW13 10/13/08 <50 <0.5 0'5 <0.5 <0.5 <0.6 <1 <10 <br /> MW14 12/05/12 240 <0,5 <1.1 <1.5 <3.5 <1 <10 <br /> EX1 12/05/12 180,000 6,800 18,000 6,200 26,600 NA NA <br /> EX2 12/05/12 10,000 5,8 3NA 4 <br /> WQO .0 23 33.6 NA NA 3,L <br /> 5 0.15 42 29 17 5 1,2008 <br /> NA: Not Analyzed, No Applicable or Data Not Available <br /> Pg/L: Micrograms per ter, parts per billion <br /> <: Not detected at ora ove stated reporting limit <br /> TPHg: Total Petroleury hydrocarbons as gasoline <br /> MTBE: Methyl tert-butether <br /> TBA: Tert-butyl alcoho <br /> WQOs: Water Quality bjectives, Central Valley Regional Water Quality Control Board(Regional Water Board) <br /> Basin Plat <br /> e: California Departmett of Public Health, Response Level <br /> Groundwater Trends <br /> • There are more than 1 years of groundwater monitoring data for this Site. Benzene trends are <br /> shown below: Source rea (EX1 and MW-8B), Near Downgradient (MW6) and Far <br /> Downgradient (MW12B . <br /> Page 8 of 13 <br />