ARCHIVED REPORTS_MONTHLY STATUS REPORT - APRIL 2013

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TABLE 4 Soil Vapor Extraction = Extraction Well Status Chevron Facility #92033 = Stockton Charter Way Commingled Plume Site 508 W Dr. Martin Luther King Jr. Blvd , Stockton , California VE-1 VE-2 VE-3 VE-4 VE-5 VE-6 Flow Flow Flow Flow Flow L Flow Date o Rate FID O2 CO2 a Rate FID OZ CO2 a Rate FID OZ CO2 a Rate FID O2 CO2 o Rate FID OZ CO2 o Rate FID OZ CO2 O O O O O O acfm ppm % % acfm ppm % % acfm ppm % % acfm ppm % % acfm ppm % % acfm ppm °/ 3/14/13 100 - 742 17.6 1 .9 100 5 20.9 0 .0 100 - 0 20.9 0 .4 100 - 71 20 .8 0 .9 100 242 17.6 3 .2 100 - 6 20 .9 0 .0 4/2/13 100 485 13. 1 5.3 100 61 19.2 1 .5 0 - 0 19. 1 2. 1 50 - 18 19. 1 2.4 50 15 16.2 4.6 100 19780 12.9 5.2 4/9/13 20 29. 1 735 - 20 60.5 143 - 20 wet 56 20 37.7 116 - - 20 35.2 74 - - 20 59 .6 4, 629 - 4/19/13 25 37. 18 252 - 25 77 .35 8 - 25 48.93 2 - -- 25 38 .44 20 - 25 54.05 27 - 25 74.56 863 - 4/26/13 50 129 5 20.9 0.0 30 135 0 20 .9 0 .0 50 128 0 20.9 0. 1 30 131 2 20.9 0.0 25 125 0 20 .9 0 .2 100 156 0 20.9 0.0 5/3/13 100 58.25 2, 150 - 100 63.60 380 - 100 67.57 121 - -- 100 61 .04 260 - 100 65 .24 21260 - 100 74.56 23170 - - 5/9/13 100 40.07 2,294 - 100 41 .60 324 - 100 40.82 206 - - 100 32.62 250 - 100 37 .55 20104 - 100 51 .72 2, 031 - - 5/9/13 100 46.60 1 ,736 -- - 100 47.99 191 - 100 43 .80 141 - 100 40.54 104 - 100 43 .80 11361 - 100 45.20 23016 - 5/9/13 100 51 .35 19942 - - 100 52.65 213 - 100 49 . 16 263 - 100 45.66 110 - 100 47.29 11028 - 100 44.87 19574 - 5/24/13 100 43.33 172 - - 100 30 .29 69 - 100 33.31 4 - 100 44.27 3 - 100 33.55 40 - 100 30.42 1 ,647 - Notes: Data collected from each pipe leg at the manifold - = Not measured or not available "H2O = Inches of water column scfm = Standard cubic feet per minute ppm = Parts per million wet = No reading due to moisture in vapor stream F.O. = Flame out 02 = Oxygen CO2 = Carbon dioxide Wet = Process flow too wet for flow measurement