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CAMBRIA Table 2.Mass Removal Data,Snell-branded Service Station,3725 Tracy Boulevard,Tracy,California Cumulative Cumulative Cumulative Cumulative Volume Volume TPHg TPHg TPHg Benzene Benzene Benzene MTBE MTBE MTBE Date Well Pumped Pumped Sample Concentration Removed Removed Concentration Removed Removed Concentration Removed Removed Purged ID (gal) (gal) Date (ppb) (pounds) (pounds) (ppb) (pounds) (pounds) (ppb) (pounds) (pounds) 25-Mar-03 BF-1 2,400 79,137 01/22/03 <50 0.001 4.28 1.1 0.000 0.094 2,000 0.040 38.6 22-Apr-03 BF-1 2,000 81,137 01/22/03 <50 0.000 4.28 1.1 0.000 0.094 2,000 0.033 38.7 20-May-03 BF-1 185 81,322 04/28/03 <50 0.000 4.28 <0.50 0.000 0.094 140 0.000 38.7 25-Jun-03 BF-1 1,800 83,122 04/28/03 <50 0.000 4.28 <0.50 0.000 0.094 140 0.002 38.7 22-Jul-03 BF-1 1,400 84,522 04/28/03 <50 0.000 4.28 <0.50 0.000 0.094 140 0.002 38.7 19-Aug-03 SF-1 2,500 87,022 07/30/03 <50 0.001 4.28 <0.50 0.000 0.094 110 0.002 38.7 23-Sep-03 BF-1 1,500 88,522 07/30/03 <50 0.000 4.28 <0.50 0.000 0.094 110 0.001 38.7 Total Gallons Extracted: 206,501 Total Pounds Removed: $.A5 0.102 - f 515 Total,Gallons Removed 0.895 0.014 Abbreviations&Notes- TPHg=Total purgeable hydrocarbons as gasoline MTBE=Methyl tertiary butyl ether ppb=Parts per billion,equivalent toµg/L µg=Micrograms L=Liter gal=Gallon g=Gram Groundwater extracted by vacuum trucks provided by ACTI through December 2001,Phillips Services as of January 2002. Water disposed of at a Martinez refinery. TPHg and benzene analyzed by EPA Method 8015/8020 MTBE analyzed by EPA Method 8260;results by EPA Method 8020 shown in italics When constituents are not detected,the concentration is assumed to be equal to half the detection limit in subsequent calculations. Mass removed(pounds)based on the formula:volume(gal)x concentration(µg(L)x(g/106jig)x(pound/453.6g)x(3.785 L/gal) Volume removed(gallons)based on the formula: [mass(pounds)x 453.6(glpound)x(gal/3.785L)x(L/1004cm3)]/density(g/cm3) Density inputs: TPHg=0.73 g/cm3,benzene=0.88 g/cm3,MTBE=0.74 g/cm3 I Concentrations based on most recent groundwater monitoring results for each hydrocarbon constituent 2 Began performing vacuum purging with a double diaphragm pump,since there was carbon filter breakthrough during the 11/1/01 event. 'MW-IA did not produce much water on May 6,2001 (may have been vapor-locked),so the total amount was taken from BF-1. 0813 Page 4 of 4