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• <br /> Phase II Site Assessment <br /> Alden Park Area <br /> ' Chevron Pipe Line Company <br /> Tracy, California <br /> 1 <br /> TABLE 2 <br /> ' MEASURED LIQUID OIL LAYER THICKNESSES <br /> IN WELLS USING ORS(l) INTERFACE PROBE AND BAILER(2) <br /> Thickness <br /> ' ORS Interface of Oil <br /> Probe(l) Bailer(2) After 2 Days(3) <br /> Well (feet) (feet ) (feet) <br /> MW-1 5. 7-7.3(4) >4.7 0.9 <br /> MW-3 2.8-4.6 4.0 0.8 <br /> ' MW-6 1.8-2.2 0.9 0. 7 <br /> MW-15 0 0 0 <br /> ' MW-16 5.7 >5.5 1.4 <br /> Notes• <br /> ' 1) Oil Systems Recovery (ORS) Interface Probe. <br /> 2) Clear 2.5-inch diameter 6 foot long acrylic bailers. <br /> ' 3) The oil layer was removed from each well using an acrylic bailer. <br /> The recovery of oil was monitored over the next two days using an <br /> ' ORS oil/water interface probe. Within one day, the depth to liquid <br /> from ground surface had essentially returned to the level existing <br /> prior to bailing. <br /> ' 4) The ranges shown indicate the uncertainty in measurements made with <br /> the ORS probe. This is probably due to the tendency of the probe <br /> to draw oil down to lower depths as it passes through the layer, <br /> ' thereby disturbing the oil/water interface. <br /> BFAIOA/AT3 <br />