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• • • CAMBFJA Table 2 Mass Removal Data Shell-branded Service Station 2575 Country Club Boulevard Stockton California Cumulative TPPH Benzene MTBE Volume Volume TPPH TPPH Removed Benzene Benzene Removed MTBE MTBE Removed Date Well Pumped Pumped Sample Concentration Removed To Date Concentration Removed To Date Concentration Removed To Date Purged ID (gal) (gal) Date (ppb) (pounds) (pounds) (ppb) (pounds) (pounds) (ppb) (pounds) (pounds) 11 Jan-01 RW-JA 4 619 386 344 01!11101 40 600 2 10 10500 04 3 84 600 3 22 13 tan Ol Z RW ]A 3 360 389 704 01/11101 40 600 1 It 10500 0 3 3 84 600 2 24 16 Ian 01 `R W IA 4 800 394 504 01111/01 40 600 2 12 10 500 04 3 84 600 3 28 19-Jan-01 "RW IA 4 800 399 304 01111101 40 600 2 14 to Soo 04 4 84 600 3 31 23-Jan-01 "RW R W I A 3 935 403 239 01/11/01 40 600 I 15 10 500 03 4 84 600 3 34 29-Jan-01 "RW-IA 4 404 407 643 01/11101 40 600 l 17 10 500 04 4 84 600 3 37 3 l-Jan 01 "RW RW 1 A 4 800 412 443 01/11101 40 600 2 19 10 500 04 5 84 600 3 40 03-FeM l '2 RW-IA 4 800 417 243 01/11/01 40 600 2 20 10500 04 5 84 600 3 44 07-Feb-01 "RW-IA 4 500 421 743 01/11/01 40 600 2 22 10 500 04 6 84 600 3 47 09-Feb-01 RW-I A 4 500 426 243 0l/1110] 40 600 2 23 10 500 04 6 84 600 3 5o 13-Feb-01 '2 RW-IA 4 800 431 043 01/11/01 40 600 2 25 10 500 04 6 84 600 3 53 16-Feb-01 "RW ]A 4 800 435 843 01/11/01 40 600 2 26 10 500 04 7 84 600 3 57 20-Feb-01 2 RW-IA 4 800 440 643 01/11/01 40 600 2 28 10 500 04 7 84 600 3 60 23-Feb-01 z RW-IA 4 800 445 443 Ol/1 1101 40 600 2 30 10500 04 8 84 600 3 64 27-Feb-01 "RW-I A 4 800 450 243 01/11/01 40 600 2 31 10500 04 8 84 600 3 67 02-Mar 01 RW-IA 4 500 454 743 01/11/01 40 600 2 33 10 500 04 8 84 600 3 70 06 Mar-O 1 RW ]A 4 800 459 543 01/11/01 40 600 2 34 10 500 04 9 84 600 3 73 09-Mar 01 ' RW-1 A 5 250 464 793 01111/01 40 600 2 36 10 500 0 5 9 84 600 4 77 12-Mar 01 RW-IA 5 000 469 793 0111 1101 40 600 2 38 10500 04 10 84 600 4 81 Total Gallons Extracted 469,793 Total Pounds Removed 331 43 54 Total Gallons removed 54 6 85 Abbreviations&Notes. TPHg=Total purgeable hydrocarbons as gasoline MTBE=Methyl tertiary butyl ether ppb=Parts per billion equivalent to Ag/L pg=Micrograms L—Liter gal=Gallon g=Gram Groundwater extracted by vacuum trucks provided by ECI Water disposed of ata Martinez refinery TPHg benzene analyzed by EPA Method 8015/8020 MTBE analyzed by EPA Method 8260 in bold font all other MTBE analyzed by EPA Method 8020 Mass removed(pounds)based on the formula volume(gal)x concentration(pgfL)x(g110'pg)x(pound/453 6g)x(3 785 Llgal) Volume removed(gallons)based on the formula [mass(pounds)x 453 6(glpound)x(ga113 785L)x(L11000cm')]l density(glcm') Density inputs TPHg=0 73 g/cm' benzene=0 88 glom' MTBE=0 74 glcm' 'Concentration based on most recent groundwater monitoring results for each constituent in well RW IA `A dedicated pump(installed Aug 2000)in well RW-lA is now pumping groundwater mto a Baker Tank which is then emptied via vacuum truck 0783 Page 3 of 3