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' The following are the lower explosive level (LEL) and oxygen content measured m each tank <br /> . immediately before removal <br /> ITank Tank <br /> ID Gallons Tank Construction Tank Contents LEL (a) Oxygen (b) <br />' A 6000 Single-Walled, Steel Gasoline - Unleaded 9 4 <br /> B 6000 Single-Walled, Steel Gasoline - Unleaded 13 1 <br /> C 10000 Single-Walled, Steel Gasoline - Premium 24 3 <br /> D 15000 Single-Walled, Steel Gasoline - Nfid-Grade 35 5 <br /> E 550 Single-Walled, Steel Used Oil --- (c) --- (c) <br />' Notes (a) Percentage of LEL measured in tanks before removal <br /> (b) Percentage of oxygen measured in tanks before removal <br /> (c) LEL and oxygen levels were not measured as the tank had previously been filled <br /> with concrete <br /> The tanks were transported by Erickson, Richmond, California, for disposal Before loading <br /> on flat-bed trucks, the condition of each tank was noted There were no holes, corrosion, or <br /> welding failure observed on any of the tanks <br /> During tank removal and soil excavation activities, ambient air quality measurements were <br /> recording using an organic vapor meter (OVM) (Thermo Environmental Instruments, Model <br /> 580b) as follows <br /> Date Time OVM Measurement (a) <br />' July 21, 1995 1015 3 <br /> 1045 3 <br /> 1117 6 <br />' <br /> 1145 7 <br /> 1340 7 <br /> July 25, 1995 1325 3 <br /> 1400 10 <br /> 1420 17 <br /> 1440 9 <br /> 1500 15 <br /> 1520 6 <br />' <br /> 1540 16 <br /> 1600 15 <br /> 1620 17 <br /> 1630 95 (b) <br /> Notes (a) OVM measurements in parts per million (ppm) <br /> (b) Soil excavations activities were suspended <br /> E\0\10 280\TANK RPr/112295 2 <br /> I�� <br />