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TABLE 4 OPERATIONAL UPTIME INFORMATION OF THE SOIL VAPOR EXTRACTION SYSTEM Former ARCO Service Station No. 548 1612 Hammer Lane,Stockton,California Date Hr.Meter No.of Days Between Sampling Dates Cumulative Days Percent ReadingTotal Das Uptime Das Down Total Da U time U time 9128100 6,109.0 0 0.0 0.0 0 0.0 0% 1014100 6,250.7 6 5.9 0.1 6 5.9 98% 10/11/00 6,420.5 7 7.1 0.0 13 13.0 100% 10/19/00 6,609.0 8 7.9 0.1 21 20.8 98% 10/24/00 6,729.0 5 5.0 0.0 26 25.8 100% 11!7/00 7,066.0 14 14.0 0.0 40 39.9 100% 11/17/00 7,306.0 10 10.0 0.0 50 49.9 100% 11/22/00 7,425.0 5 5.0 0.0 55 54.8 99% ' 11/28/00 7,568.0 6 6.0 0.0 61 60.8 99% 1217/00 7,791.5 9 9.3 0.0 1 70 70.1 100% 12/27/00 8,272.8 20 20.1 0.0 90 90.2 100% 118101 8,554.0 12 11.7 0.3 102 101.9 98% 1119/01 8,820.0 11 11.1 0.0 113 113.0 100% 1/23101 8,913.0 4 3.9 0.1 117 116.8 97% 2/6101 1 9,249.0 14 14.0 0.0 131 130.8 100% 2119101 1 9,564.0 13 13.1 0.0 144 144.0 100% 3/5/01 9,845.0 14 11.7 2.3 158 155.7 84% 317/01 9,907.0 2 2.6 0.0 160 158.3 100% 3/17101 10,143.0 10 9.8 0.2 170 168.1 98% 04/02/011 10,285.0 16 5.9 10.1 186 174.0 37% 4116/01 Replaced Blower and Restarted System 4123101 10,451.0 21 6.9 14.1 207 180.9 33% 05/07/012 10,623.0 14 7.2 6.8 221 188.1 51% 5131/01 Replaced Blower and Restarted System 614101 10,638.0 2B 1 27.4 249 188.7 2% 6118/01 10,972.0 14 13.9 0.0 263 202.6 100% 712J01 11,310.0 14 14.1 0.1 277 216.7 99% 7/23101 11,677.0 21 15.3 5.7 298 232.0 73% 816101 12,013.0 14 14.0 0.0 312 246.0 100% 8120/01 12,349.0 14 14.0 0.0 326 260.0 100% 915101 12,731.0 16 15.9 0.1 342 275.9 99% 9/17/01 13,025.0 12 12.3 0.3 354 288.2 98% 1011101 13,356.0 14 13.8 0.2 368 362.0 99% 10/15101 13,694.0 14 14.1 0.0 382 316.0 100% 1115/01 14,197.0 21 21.0 0.0 403 337.0 100% 11/26/013 14,294,7 21 4.1 16.9 424 341.1 19% 1/8/02 14,296.0 43 0.1 42.9 467 341.1 0,13% 1121102 14,532.0 13 9.8 3.2 480 351.0 75.64% 2/4102 14,873.0 14 14.2 0.0 494 365.2 100% 2125/02 15,371.0 21 20.8 0.3 515 1 385.9 99% 314102 15,540.0 1 7 7 0.0 522 393.0 100% 3118/02 15,740.0 1 14 8 5.7 536 401.3 59% Upon arrival at site system was found to be shut down due to an inoperable blower. 2 System was shutdown on arrival,chart recorder indicated system shutdown on 4129101. • The Blower was removed for repair/replacement 3 System down due to power outage and was not re-started for four weeks to allow recharge in wells and to monitor for increase in concentration. System down due to power outage Delta Afco_0548_Quanaiy_0&M Page l of t