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TABLE 4 <br /> OPERATIONAL UPTIME INFORMATION OF THE <br /> SOIL VAPOR EXTRACTION SYSTEM <br /> ARCO Service Station No. 548 <br /> 1612 Hammer Lane, Stockton, California <br /> Date Hr. Meter No.of Das Between Sampling Dates Cumulative Das Percent <br /> Reading Total Das Uptime Das Down Total Das U time Uptime <br /> 11/5/2001 14,197.0 21 21.0 0.0 403 337.0 100% <br /> 11/26/013 14,294.7 21 4.1 16.9 424 341.1 19% <br /> 1/8/2002 14,296.0 43 0.1 42.9 467 341.1 0.13% <br /> 1/21/2002 14,532.0 13 9.8 3.2 480 351.0 75.64% <br /> 2/4/2002 14,873.0 14 14.2 0.0 494 365.2 100% <br /> 2/25/2002 15,371.0 21 20.8 0.3 515 385.9 99% <br /> 3/4/2002 15,540.0 7 7 0.0 522 393.0 100% <br /> 3118/02* 15,740.0 14 8 5.7 536 401.3 60% <br /> 4/1/2002 16,076.0 14 14.0 0.0 550 415.3 100% <br /> 4/22/2002 16,579.0 21 21.0 0.0 571 436.3 100% <br /> 6/24/2002 17,306.4 63 30.0 32.7 634 466.3 48% <br /> 7/16/2002 17,833.1 22 22.0 0.0 656 488.3 100% <br /> 8/27/2002 18,840.1 42 42.0 0.0 698 530.3 100% <br /> 9/24/2002 19,511.1 28 28.0 0.0 726 558.3 100% <br /> 10/16/2002 20,044.5 22 22.0 0.0 748 580.3 100% <br /> 11/19/2002 20,652.3 34 34.0 0.0 782 614.3 100% <br /> 12/26/2002 21,238.2 37 37.0 0.0 819 651.3 100% <br /> 1/22/2003 21,886.3 28 28.0 1 0.0 847 679.3 100% <br /> 2/24/2003 21,887.5 33 0.0 33.0 847 679.3 0% <br /> 3/20/2003 21,911.5 24 24.0 0.0 1 871 703.3 100% <br /> ' Upon arrival at site system was found to be shut down due to an inoperable blower. <br /> 2 System was shutdown on arrival, chart recorder indicated system shutdown on 4129101. <br /> The Blower was removed for repair/replacement <br /> 3 System down due to power outage and was not re-started for four weeks <br /> to allow recharge in wells and to monitor for increase in concentration. <br /> System down due to power outage <br /> • <br /> Page 2 of 2 <br /> K:lwprocessV5 SP ARC0105481Quarter1y\1 QTR 0310548 08M 1003 <br />