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CAMBRIA <br /> Table 5 Temporary Groundwater Extraction System Mass Removal Data,Former Shell Service Station/Econo Gas,880 Victor Road,Lodi,California <br /> Cumulative Estimated Cumulative Cumulative <br /> Period Volume System TBA TBA TBA MTBE MTBE MTBE <br /> Date Volume Pumped Flow Rate Sample Concentration Removed Removed Concentration Removed Removed <br /> Purged (gal) (gal) ( -) Date ( b) (pounds) (pounds) (ppb) (pounds) (pounds) <br /> 29 Sep-05 0 9129/2005 56 000 1 300 <br /> 15-Oct-05 9 975 9 975 0 433 9/29/2005 56 000 4 661 4 661 1 300 0 108 0 108 <br /> 28 Oct-05 4 739 14 714 0 253 10/1812005 7 006 0 277 4 939 3 952 0 156 0 264 <br /> 11 Nov-05 13 815 28 529 0 695 11/1/2005 5 625 0 648 5 597 3 659 0 422 0 686 <br /> 23 Nov-05 8 043 36 572 0 465 11/1/2005 5 625 0 378 5 964 3 659 0 246 0 932 <br /> 02 Dec-05 3 491 40 053 0 269 11/112005 5 625 0 163 6 129 3 659 0 106 1 038 <br /> 16-Dec-05 5 277 45 330 0 262 12/13/2005 7200 0 317 6 445 9 600 0 423 1 461 <br /> 30-Dec-05 9202 54 532 0 456 12/13/2005 7200 0 553 6 997 9 600 0 737 2 198 <br /> 31 Dec-05 2 142 56 674 1 488 12113!2005 7200 0 129 7 126 9 600 0 172 2 370 <br /> Total Gallons 56,574 0 539 Total Pounds Removed 7126 2 370 <br /> Extracted Total Gallons Removed 1095 0 384 <br /> Abbreviations&Notes <br /> TSA=Tent butyl alcohol <br /> MTBE=Methyl tertiary butyl ether <br /> ppb=Parts per billion equivalent to jig/1- <br /> pg <br /> g1Lleg=Micrograms <br /> L-Iater <br /> gal=Gallon <br /> g=Gram <br /> TBA and MTBE analyzed by EPA Method 8260B <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(pglL)x(g/106pg)x(pound/453 6g)x(3 785 Ugal) <br /> Volume removed(gallons)based on the formula lmass(pounds)x 453 6(glpound)x(galla 785L)x(U1000cm)l l densuy(glcro) <br /> Density inputs TBA=0 78 g/cmi MTBE=0 74 g/cm3 <br /> Notes <br /> Groundwater is extracted and contained in a 21 000 gallon Baker tank <br /> The Baker tank is periodically emptied using vacuum trucks provided by Onyx Industrial The water is disposed of at Shells Martinez refinery <br /> Concentrations are an average of the grab sample results for wells MW-2 and MW-4 <br /> However the 9129/2005 sample result is for MW 4 only as MW 2 was dry dunng this sampling event <br /> Beginning on 12/1312005 groundwater system extraction is from MW-4 only As a result the sample concentration used in removal calculations is for MW 4 <br /> G 1Lodi 890 VictoAREMEDIATIONIO&M10955 Temp GWE Mass Removal xis Page 1 of 1 <br />