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<br /> Table 1
<br /> Plume Mass Calculations
<br /> Former Unocal Station No 5098
<br /> 5606 Pacific Avenue
<br /> Stockton, California
<br /> MONITORING PLUME PLUME PLUME PLUME OVERALL PLUME CONTAMINANT
<br /> COMPOUND DATE PERIOD VOLUME AREA AREA CONCENTRATION VOLUME MASS
<br /> t -u 1L t') (acres) (Ug/LJ (acre-ft) K
<br /> Benzene 12/22/1998 4Q98 255,785,292 204,795 470 1249 94 4343
<br /> Z=5 ug/L2 9/1611999 3Q99 224,093,134 204,902 470 1094 94 3805
<br /> 12/13/2000 4Q00 29,779,971 123,348 2 83 241 57 506
<br /> 12/412001 4Q01 116,751,903 162,726 3 74 717 75 1982
<br /> 12/212002 4Q02 110,345,636 172,527 396 640 79 1874
<br /> 12/18/2003 4003 489,029,803 277,569 637 1762 127 8304
<br /> 2/2612004 1 Q04 86,834,314 186,827 4 29 465 86 1474
<br /> 4112/2004 2Q04 109,615,515 236,922 544 463 109 1861
<br /> 7/1312004 3Q04 33,906,055 162,815 374 208 75 576
<br /> 10/22/2004 4Q04 88,238,224 118,097 2 71 747 54 1498
<br /> TPHg 4Q98 1,627,840,451 211,408 485 7700 97 27641
<br /> Z=60 ug/L2 3Q99 1,090,967,736 196,818 4 52 5543 90 18525
<br /> 4000 375,498,716 180,703 4 15 2078 83 6376
<br /> 4Q01 731,576,938 172,885 3 97 4232 79 12422
<br /> 4Q02 622,639,052 153,363 3 52 4060 70 10572
<br /> 4Q03 2,346,214,870 278,200 6 39 8434 128 39839
<br /> 1Q04 1,029,271,760 195,562 449 5263 90 17477
<br /> 2Q04 550,613,160 215,868 4 96 2551 99 9349
<br /> 3Q04 93,538,994 198,308 4 55 472 91 1588
<br /> Q04 431,976,348 116,681 268 3702 54 7335
<br /> Explanations ' =Overall plume volume calculation assumes an aquifer zone thickness of 20 feet
<br /> z="Z"value is the base level (contour interval) upon which the calculations are based
<br /> 3 =Tentative results
<br /> 06940-293 1 of 1 ENSR Corporation
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