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Table 2 <br /> Historical Groundwater Analytical Data <br /> Surland Homes <br /> Tracy,California <br /> All concentrations reported in micrograms per liter(ug/L) <br /> TPHd Ethyl- <br /> Well ID Date TPHd (with Silica Gel) TPHg Benzene Toluene benzene Xylenes PAHs <br /> TW-11 09/14/98 NA NA NA <0.5 <0.5 <0.5 <0.5 ND <br /> 10/16/98 NA NA NA <0.5 <0.5 <0.5 <0.5 ND <br /> 07/29/99 NA NA NA <0.5 <0.5 <0.5 <0.5 ND <br /> 10/14/99 <50 NA <50 <0.5 <0.5 <0.5 <0.5 ND <br /> 01/14/00 97 <50 <50 <0.5 <0.5 <0.5 <0.5 <0.1 <br /> 04/19/00 <50 <50 NA <0.5 <0.5 <0.5 <0.5 <0.1 <br /> 09/09/03 88 <50 NA <0.5 <0.5 <0.5 <0.5 <0.1 <br /> TW-21 09/14/98 520 NA 1200 <0.5 <0.5 1.7 4.1 Acenaphthene 0.9 <br /> Flourene 2.2 <br /> Phenanthrene 1.4 <br /> 10/16/98 NS NS NS NS NS NS NS NS <br /> 07/29/99 NS NS NS NS NS NS NS NS <br /> 10/14/99 NS NS NS NS NS NS NS NS <br /> 11/08/99 Well Abandoned <br /> TW-31 07/29/99 100 <50 <50 <0.5 <0.5 <0.5 <0.5 ND <br /> 10/14/99 150 <50 <50 <0.5 <0.5 <0.5 <0.5 ND <br /> 01/14/00 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 <0.1 <br /> 04/19/00 <50 <50 <50 <0.5 <0.5 <0.5 <0.5 <0.1 <br /> 09/09/03 <50 NA NA <0.5 <0.5 <0.5 <0.5 <0.1 <br /> Notes: <br /> TPHd Total petroleum hydrocarbons as diesel <br /> TPHg Total petroleum hydrocarbons as gasoline <br /> PAHs Polynuclear aromatic hydrocarbons <br /> NS Not sampled <br /> NA Not analyzed <br /> ND Not detected <br /> < Less than laboratory detection limit <br /> Source: <br /> 1 Analytical results prior to September 2003 from Geomatrix Consultants,2001,Quarterly Groundwater Monitoring Report, <br /> Surland Homes Property. <br />