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TABLET <br /> Page 9 of 9 <br /> WELL CONCENTRATIONS 4Q10 <br /> FORMER SHELL CENTRAL VALLEY CRUDE OIL PIPELINES <br /> NEIGHBORHOODS B,C,D <br /> MOUNTAIN HOUSE,CALIFORNIA <br /> Notes and Abbreviations- <br /> TPHc-Total petroleum hydrocarbons as crude oil analyzed by EPA Method 8015B <br /> TPHd—Total petroleum hydrocarbons as diesel analyzed by EPA Method 8015B <br /> BTEX-Benzene,toluene,ethylbenzene,xylenes by EPA Method 82608. <br /> TOC-Top of Casing Elevation <br /> ug/L-micrograms per liter <br /> mg/L-milligrauw per liter <br /> MSL-Mean sea level <br /> ft-Feet <br /> <n-Below detection limit <br /> NA-Not applicable <br /> a-TPHd is quantified in the carbon range CIO4C78. <br /> b-TPHc is quantified in the carbon range C6-C44. <br /> c-The sample chromatographic pattern for TPH does not match the chromatographic pattern of the specified standard. <br /> Quantitation of the unknown hydrocarbons)in the sample was based on the specified standard. <br /> Not analyzed <br /> �iuimn.amn-anaaea-xr.wc seoruw�oio <br />