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CAMBRIA <br /> Table 1 Mass Removal Data,Shell-branded Service Station,3725 Tracy Boulevard,Tracy,California <br /> Cumulative Cumulative Cumulative Cumulative <br /> Volume Volume TPHg TPHg TPHg Benzene Benzene Benzene MTBE MTBE MTBE <br /> Date Well Pumped Pumped Sample Concentration Removed Removed Concentration Removed Removed Concentration Removed Removed <br /> Purged ID (gal) -(dal) Date (ppb) (pounds) (pounds) (ppb) _(pounds) (pounds) (ppb) (pounds) (pounds) <br /> 15 Feb4l BF 1 2,422 26 495 01/23/01 020,000 <0 202 <1 96 390 <0 008 <0 045 110,000 2 223 191 <br /> 23 Mar-01 BF 1 2 101 28 596 01/23/01 <20 000 <0 175 <2 14 390 <0 007 <0 052 110 000 1929 210 <br /> 26-Apr-Ol BF-1 2,400 30 996 01123/01 <20,000 <0 200 02 34 390 <0 008 <0 060 110 000 2203 232 <br /> 06-May 01 3 BF-1 5 529 36 525 01/23/01 <20 000 <0 461 <2 80 390 <0 018 <0 078 110 000 5 075 283 <br /> 23 May 01 BF 1 2 180 38 705 01/23/01 40 000 <0 182 <2 98 390 <0 007 <0 085 110000 2001 303 • <br /> 08-Jun 01 BF 1 2,400 41 105 06/05/01 <13,000 <0 130 <3 11 <50 <0 001 <0 085 33,000 0 661 309 <br /> 22 Jun 01 BF-1 3 700 44 805 06/05/01 <13,000 <0 201 <3 31 <50 <0 001 <0 086 33 000 1 019 319 <br /> 05 Jul 01 BF 1 2 500 47 305 06/05/01 <13,000 <0 136 <3 45 <50 <0 001 <0 086 33,000 0 688 326 <br /> 23-Jul-01 BF-1 2,200 49,505 06/05/01 <13,000 <0119 <3 57 <50 <0 000 <0 087 33,000 0 606 332 <br /> 09-Aug-01 BF-1 1,500 51,005 07/27/01 40,000 <0125 <3 69 400 <0 001 <0 088 75,000 0 939 342 <br /> 25-Aug-01 BF-1 2,100 53,105 07127/01 40,000 <0 175 <3 87 <200 <0 002 <0 090 75,000 1.314 355 <br /> 08-Sep-01 BF-1 1,400 54,505 07/27/01 <20,000 <0117 <3 99 <200 <0 001 <0 091 75,000 0 876 364 <br /> 28-Sep-01 BF-1 1,000 55,505 07/27/01 <20,000 <0 083 <4 07 400 <0 001 <0 092 75,000 0 626 370 <br /> Total Gallons Extracted 97,208 Total Pounds Removed <4 73 40% 455 <br /> Total Gallons Removed <0.78 <0.013 7.37 <br /> Abbreviations&Notes <br /> TPHg=Total purgeable hydrocarbons as gasoline <br /> MTBE=Methyl tertiary butyl ether <br /> ppb=Parts per billion equivalent to pglL <br /> µg=Micrograms <br /> L=Liter <br /> gal=Gallon <br /> g=Gram <br /> Groundwater extracted by vacuum trucks provided by ACTI Water disposed of at a Martinez refinery <br /> TPHg and benzene analyzed by EPA Method 8015/8020 <br /> MTBE analyzed by EPA Method 8260,results by EPA Method 8020 shown in italics <br /> When constituents are not detected,the concentration is assumed to be equal to half the detection limit in subsequent calculations <br /> Mass removed(pounds)based on the formula volume(gal)x concentration(pg/L)x(g1l06µg)x(pound/453 6g)x(3 785 Ugal) <br /> Volume removed(gallons)based on the formula [mass(pounds)x 453 6(glpound)x(gal/3 785L)x(ll1000cm3)]1 density(glcm) <br /> Density inputs TPHg=0 73 glcm3 benzene=0 88 g1cm3,MTBE=0 74 glcm3 <br /> i Concentrations based on most recent groundwater monitoring results for each hydrocarbon constituent <br /> Began performing vacuum purging with a double diaphragm pump since there was carbon filter breakthrough during the 1111101 event <br /> 7 MW 1 A did not produce much water on May 6 2001(may have been vapor locked),so the total amount was taken from BF-1 <br /> 0813 Page 2 of 2 <br />