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4 <br /> u <br /> chain-of-custody procedures will be followed. On the basis of these analyses , <br /> the soil will be disposed at a location approved by Chevron, the RWQCB, and the <br /> City of Tracy. <br /> r We expect that the Chevron representative will be available to prepare <br /> transportation manifests as required. <br /> r <br /> Water Disposal <br /> 8 <br /> fi Water generated during well development and pumping will be contained <br /> in 55 gallon drums or in a tanker truck. Water which is obviously contaminated <br /> will be removed to a proper disposal site. Other drums will be sampled and ana- <br /> lyzed for oil and grease following procedures described in the Soil Disposal <br /> section. If levels are low enough and if permission can be obtained from the <br /> City of Tracy, this water will be disposed of in the sewer. Other water will be <br /> disposed of in a manner approved by Chevron, the RWQCB, and the City of Tracy. <br /> As with the soils, we expect that a Chevron representative will be available <br /> to prepare transportation manifests as required. <br /> 4 FREE OIL INVESTIGATION <br /> Purpose <br /> The purpose of this task is to install and sample observation wells in order <br /> to establish whether free oil is present beneath the reservoir slab. Additional <br /> wells will be installed in a step-out pattern beyond the slab perimeter as <br /> needed to define the extent of such free oil. The step-out procedure will be <br /> y designed so as to assess the lateral and down-gradient extent of the plume of <br /> floating free oil, if such a plume exists. The number, spacing, and placement <br /> of these wells will be dependent on the results obtained during the first few <br /> . well installations made. We have, therefore, indicated on Plate 2 only the <br /> first six wells to be installed. <br /> Three wells will be placed through the slab, a minimum of three wells will <br /> be installed immediately outside the slab perimeter where access permits, and <br /> step-out wells will be installed outward from the concrete slab at a spacing to <br /> be determined. The ultimate number of wells will, of course, be dependent upon <br /> fi <br /> the results obtained in the step-out program. More details are provided below. <br /> JED2/H -9- <br />