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CAMBRIA <br /> TolvA Groundwater Extraction Mass Removal Data,Shell-branded Service Station,2575 Country Club Boulevard,Stockton,Callfornta <br /> TPHg Benzene MTBE _ <br /> Site Flow Meter Cumulative Flow TPHg Period Cumulative Benzene Period Cumulative MTBE Period Cumulative <br /> Visit Reading Volume Rate Cone Removal Removal Cone Removal Removal Cone Removal Removal Active <br /> (mmldd/ ) ( al) ( al) ( m) (ppb) (pounds) ( unds) (ppb) (pounds) (pounds) ( h) (pounds) (pounds) Wells Comments <br /> 09/10/03 628,820 1,939,960 164 12,000 4 97 573.2 3,900 1614 7929 19,000 786 721.2 RW-IA <br /> 09/23/03 677,030 1,988,170 288 17,000 6.84 S800 2,500 1006 8029 10,000 402 7251 RW 1A <br /> 10/02103 709,811 2,020,951 253 7,100 194 $819 1,600 OA38 8073 7,400 202 727.3 RW-1A <br /> 10/14/03 751,280 2,062,420 2A0 NS 246 5844 NS 0554 8128 NS 286 7298 RW lA System shut down <br /> Told Gallatns ExtCMew 2,062,420TOUT PouriftRemoved 584 Total Pounds Removed 813 jTotafPm3*IIdWsVQI �0 <br /> ITotalGallowRomoved 959 Total Gallons Removed 112 Total 92o I.M&04- 1 $ <br /> Abbreviations&Notes <br /> TPHg=Total purgeable hydrocarbons as gasoline <br /> MTBE=Methyl tett butyl ether <br /> Cone =Concentration <br /> ppb=Pans per billion,equivalent toµg/L <br /> µg/L=Nficrograms per liter <br /> L=Liter <br /> gpm=Gallons per minute <br /> gal=Gallon <br /> g=Gram <br /> NS=Not sampled <br /> Mass removed based an the formula volume extracted(gal)x Concentration(gg/L)x(g/106gg)x(pound/453 6g)x(3 785 Ugal) <br /> When coustrtuents are not detected the concentration is assumed to be equal to half the detection lmut in subsequent calculations <br /> Volume removal data based on the formula mass(pounds)x(density)1(cm3/g)x 453 6(g/pound)x(01000 cm3)x(galla 785 L) <br /> Density inputs TPHg=0 73 g/cm3 benzene=0 88 g/cn? MTBE=0 74 g1cm3 <br /> TPHg,benzene and MTBE analyzed by EPA Method 8260B <br /> Page 3 of 3 <br /> 0783 <br />