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TABLE 1 Page 4 of 4 <br /> GROUNDWATER DATA <br /> FORMER SHELL CENTRAL VALLEY CRUDE OIL PIPELINES - <br /> CORDES RANCH <br /> TRACY,CALIFORNIA <br /> Ground Depth to Depth to Depth m&p- o- Xylenes <br /> Well ID Sample Date TOC Surface Water Water GW Elev to SPH Thickness TPHc TPHd Benzene Toluene Ethylbenzene Xylenes Xylene (total) TDS <br /> ft MSL ft MSL ft TOC ft bgs ft MSL feet feet ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L mg/L <br /> Notes and Abbreviations: <br /> ug/L=micrograms per liter(parts per billion) <br /> mg/L=milligrams per liter <br /> <n=Below detection limit <br /> -=Not analyzed <br /> TPHc=Total petroleum hydrocarbons as crude oil by EPA Method 8015B(M)(C6-C44) <br /> TPHd=Total petroleum hydrocarbons as diesel by EPA Method 8015B(C10-C28) <br /> Benzene,toluene,ethylbenzene,xylenes by EPA Method 8260B. <br /> TDS=Total dissolved solids by Standard Methods 2540 C <br /> TOC=Top of casing elevation(Elev)in feet(ft)relative to mean sea level(MSL) <br /> ft bgs=feet below ground surface <br /> GW=Groundwater <br /> Depth to water measured at TOC <br /> a=Hydrocarbon result partly due to individual peak(s)in quantitation range. <br /> b=EPA 8015B w/Silica Gel Clean-up <br /> c=Depth to water measurements taken prior ro well development. Measurement is inaccurate due to excessive sediment in well. Well redeveloped and sediment removed in September 2011. <br /> d=Due to laboratory error,silica gel clean-up not performed. <br /> The formula:TOC+(sph thickness(0.8))-DTW was used for groundwater elevation <br /> Zone A=Well screen interval 30 to 50 ft bgs. <br /> Zone B=Well screen interval 105 to 125 ft bgs. <br /> Zone C=Well screen interval 160 to 177 ft bgs. <br /> CRA060223(16) <br />