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U <br /> '—A chain-of-custody form will be used to record possession of the sample from time of collection to <br /> its arrival at the laboratory. When the samples will be shipped, the person in custody of them will k <br /> relinquish the samples by signing the chain-of-custody form and noting the time. The sample control <br /> officer at the laboratory will verify sample integrity and confirm that it was collected in the proper <br /> container, preserved correctly, and that there is an adequate volume for analysis. <br /> 7.0 GROUNDWATER DEPTH EVALUATION <br /> Depth to groundwater will be measured to the nearest 0.01 foot using an electronic hand-held water <br /> level indicator. The top of the probe will be examined to evaluate whether a product sheen is present. <br /> 8.0 SURVEYING <br /> The top of each new well riser will be surveyed to allow correlation of the groundwater levels at the <br /> site. The surveyed point of each well riser will be marked to help insure future groundwater level <br /> measurements are taken from the same location. Elevations will be surveyed relative to the <br /> benchmark to the nearest 0.01-foot. <br />