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i <br /> TABLE 4 <br /> OPERATIONAL UPTIME INFORMATION OF THE <br /> • SOIL VAPOR EXTRACTION SYSTEM <br /> Former ARCO Service Station No. 548 <br /> 1612 Hammer Lane, Stockton, California <br /> Date Hr. Meter No. of Days Between Sampling Dates Cumulative Das Percent <br /> Reading Total Das Uptime Das Down Total Das Uptime Uptime <br /> 01/08/02 14,296.0 43 0.1 42.9 467 341.1 0.13% <br /> 01/21/02 14,532.0 13 9.8 3.2 480 351.0 75.64% <br /> 02/04/02 14,873.0 14 14.2 0.0 494 365.2 100% <br /> 02/25/02 15,371.0 21 20.8 0.3 515 385.9 99% <br /> 03/04/02 15,540.0 7 7 0.0 522 393.0 100% <br /> 3118102 4 15,740.0 14 8 5.7 536 401.3 60% <br /> 04/01/02 16,076.0 14 14 0.0 550 415.3 100% <br /> 04/22/02 16,579.0 21 21 0.0 571 436.3 100% <br /> 6/24102 s 17,306.4 63 30 32.7 634 466.6 48% <br /> ' Upon arrival at site system was found to be shut down due to an inoperable blower. <br /> z System was shutdown on arrival, chart recorder indicated system shutdown on 4129/01. <br /> The Blower was removed for re pairlreplacement <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 /> 4 System down due to power outage <br /> System shutdown during the month of May for Consultant transition of the site. <br /> Arco_0548_Quarterky_0&M Page 2 of 2 <br />