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West Clay Properties January 2014 <br /> 639 West Clay Street <br /> Claim No: 8542 <br /> Most Recent Concentrations of Petroleum Constituents in Groundwater <br /> Sample Sample TPHg TPHd Benzene Toluene Ethyl- Xylenes MTBE TBA <br /> Date (Ng/L) (Ng/L) (Ng/L) (Ng/L) Benzene (Ng/L) (Ng/L) (Ng/L) <br /> (Vg/L) <br /> MW1 07/23/13 20,000 1,500 2,300 87 420 442 <1.0 <10 <br /> MW2 07/23/13 18,000 2,00_0 280 73 550 737 <1.0 <10 <br /> MW3 09/05/08 <50 <50 <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW4 04/04/07 <50 <50 <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW5 09/29/10 1 <50 <50 <0.5 1 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW7 09/05/08 <50 <50 <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW8a 12/19/05 200 <50 <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW8b 03/24/10 <50 <50 <0.5 <0.5 <0.5 <0.6 <0.5 <10 <br /> MW9 07/23/13 <50 NA <0.5 <0.5 <0.5 <0.6 11 <10 <br /> MW10 09/29/10 <50 NA <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW 11 a 04/04/07 <50 NA <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW 11 b 07/23/13 <50 NA <0.5 <0.5 <0.5 <0.6 6.4 <10 <br /> MW12a 04/04/07 1 <50 NA <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW12b 04/04/07 <50 NA <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW13a 04/04/07 <50 NA <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW 13b 04/04/07 <50 NA <0.5 1 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW14a 12/08/08 <50 NA <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW 14b 07/23/13 <50 NA <0.5 <0.5 <0.5 <0.6 30 <10 <br /> MW 16 03/24/10 <50 <50 <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW 17 04/04/07 <50 <50 <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW18 04/04/07 1 <50 <50 <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW 19 04/04/07 <50 _<50 <0.5 <0.5 <0.5 <0.6 <1.0 I <10 <br /> MW20 04/04/07 <50 <50 <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW21 03/24/10 <50 <50 <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW22 04/04/07 <60 <50 <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW23 04/04/07 <50 <50 <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW24 04/04/07 1 <50 <50 <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW25 03/24/10 <50 _NA <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW26 03/24/10 <50 _NA <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW27 07/23/13 <50 _<50 <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> MW28 07/23/13 <50 NA <0.5 <0.5 <0.5 <0.6 13 <10 <br /> MW29 10/19/06 12,000 5,600 800 50 340 379 <1.0 <10 <br /> EW 1 09/29/10 160 NA <0.5 <0.5 <0.5 <0.5 <1.0 <10 <br /> EW2 07/23/12 <50 <50 <0.5 <0.5 <0.5 <0.6 <1.0 <10 <br /> WQOs - 5 56 0.1542 29 17 5 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 /> aCalifornia Department of Public Health, Response Level <br /> Page 10 of 14 <br />