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?AMBRIA <br /> ks g <br /> i <br /> �s <br /> TPHg Benzene MTBE I <br /> Site Flow Meter Cumulative Flow TPI-Ig Period Cumulative Benzene Penod Cumulative MTBE Period Cumulative ; <br /> Visit Reading Volume Rate Cone Removal Removal Cone Removal Removal Cone Removal Removal Active <br /> (mm(ddl ) ( al) ( ( -) (ppb) (pounds) (pounds) ( b) (pounds) (pounds) (Ppb) (pounds) (pound ) Wells Comments <br /> 02115105 155 345 2 416 905 177 73 000 1086 6485 11000 1 637 9220 92 000 1369 7966 RW 1 A <br /> 02124105 163 181 2424,741 0 60 NS 477 6533 NS 0 719 9292 NS 602 8026 RW-1 A <br /> System shut down pending LEL meter <br /> sensor replacement and carbon <br /> 02/28/05 173 517 2,435 077 179 71000 612 6594 13 000 1 121 9404 83,000 716 9098 RW-IA replacement <br /> Carbon replaced in 3 vessels on <br /> 3118105 System left off LEL meter <br /> sensor replaced and reinstalled 3130105 <br /> 03/30/05 174,151 2,435,711 001 160,000 08S 6602 16,000 0 085 9412 100,000 053 810.3 RW-IA System restarted <br /> 04/04/05 192,768 2,454,328 2.59 NS 2486 6851 NS 2 486 9661 NS 15.53 8258 RW-1A <br /> 04/14/05 226,390 2,487,950 233 70,000 1964 7047 19,000 5.331 10194 61,000 1711 8430 RW 1A <br /> 04/18/05 237,603 2,499,163 195 140,000 1310 7178 22,000 2058 10400 82,000 7 67 8506 RW 1A <br /> GWE system shut down pending <br /> 04/27/05 267,959 2,529,519 2.34 NA 3546 753.3 NA 5 573 10957 NA 2077 8714 RW-IA carbon replacement activities <br /> Carbon replaced in 3 vessels on <br /> 05/11/05 274,308 2,535,868 0.31 NA 742 7607 NA 1166 11074 NA 4.34 8767 RW IA 5111105 System restarted <br /> 05/16/05 289,036 2,550,596 205 55,000 676 7675 10,000 1229 11196 47,000 578 8815 RW lA <br /> �i <br /> Abbreviations&Notes <br /> TPHg=Total purgeable hydrocarbons as gasoline <br />` MTBE=Methyl tent-butyl ether <br /> Cone =Concentration <br /> ppb=Pads per billion,equivalent to pg/L <br /> I <br /> pg/L=Micrograms per liter <br />` L=Luer <br /> gpm=Gallons per minute <br /> gal=Gallon <br /> g=Gram <br /> NS=Not sampled <br /> NA=Not analyzed <br /> Mass removed based on the formula volume extracted(gal)x Concentration(µg/L)x(g/O0 kg)x(pound/453 6g)x(3 785 L/gal) <br /> When constituents are not detected,the concentration is assumed to be equal to half the detection limit in subsequent calculations <br /> Volume removal data based on the formula mass(pounds)x(densi(y)-I(cm3/g)x 453 6(g/pound)x(L11000 cm)x(ga113 785 L) <br /> Density inputs TPHg=0 73 g/cin3,benzene=0 88 g/cm3 MTBE=0 74 glcm3 <br /> TPHg,benzene and MTBE analyzed by EPA Method 8260B <br /> " <br /> Approximately 23 578 gallons of extracted groundwater was off-hauled to Shell s Martinez Refinery using vacuum trucks between June l i and June 25 2004 <br /> Page 4 of 4 <br /> 0783 <br />