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Table A-3 Soil Vapor Extraction System Well Data ARCO Service Station#2093 3425 Tracy Blvd,Tracy California VES-7 ATR-3 ATR-4 ATR-5 TEx-1 TPHg Vacuum Flow, TPHg Vacuum, Flow TPHg Vacuum Flow TPHg,Vacuum, f=low TPHg, Vacuum Flow Date Status ppmv 'H20 Cfm Status ppmv H2O cfm Status ppmv H2O cfm Status ppmv "H2O cfm Status ppmv "H2O cfm 10/23/2000 O - 401 283 C C C 0 3 401 178 11/2812000 0 4 451 274 C C C 0 1 44 165 12118!2000 0 6 458 266 C C C 0 3 451 171 III W001 0 2 46 3 283 C — C C O 0 46 175 2/13/2001 0 3 464 304 C C C O 0 453 197 4/1 712 00 1 O 3 482 264 C C C 0 2 441 202 5/21/2001 O 2 459 264 C C C O 4 461 172 6/2512001 - - -- - - - System Off- - - — 7!12/2001 System Off- 8l1712001 - - System Off- 9/1112001 - - - - - System Off- 10/15/2001 - - - - -System Off- - - - - - - - - 11l16l2001 - -- System Off 12/4/2001 -System Off- - — 1/15/2002 System Off— - 2/8/2002 System Off- - - - - - - - 3/11/2002 System Off—- - - 4/12/2002 System Off - - —— - V312002 — -- System Off — 7/16/2002 System Off —— MW2002 - -- - - - - -System Off- - 9/2412002 - -- - -—- - System Off - 10/t6/2002 - -- - - - - - System Off - - - ----- - - 11/26/2002 - -- System Off - 12/26/2002 System Off - - 1/22/2003 -System Off - - - - - - - 2/24/2003 — - -system Off- - - —- 3/20/2003 — -System OH - - -—— - - 4/15/2003 —- - -System Off - - 5/28/2003 ---System Off - -— - - — 6/24/2003 System Off - - - - O=Open C=Closed "=Not measured TPHg=Total Petroleum Hydrocarbons as gasoline cfm=cubic feet per minute ppmv=parts per million by volume H20=inches of water ARCO/2093/0&W2 Page 2 of 2