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April 22, 1993 Working To Restore Nature <br /> Fire Engine Company No 2, Stockton, California <br /> Sample Labeling and Handlin <br /> Soil samples collected for possible chemical analyses were promptly sealed with aluminum <br /> foil, plastic caps, and tape They were then labeled and placed in iced storage for transport <br /> to the analytical laboratory Water samples were preserved in laboratory-cleaned, 44- <br /> milliliter glass vials that contained concentrated hydrochloric acid as a preservative The <br /> water samples were sealed with Teflon-lined lids to eliminate air bubbles The sample <br /> containers were labeled in the field with the site identification, monitoring well number and <br /> depth, and date, and promptly placed in iced storage for transport to the laboratory The <br /> technician or geologist initiated Chain of Custody Records in the field that accompanied the <br /> samples to a laboratory certified by the State of California for the analyses requested <br /> Samples were transported to the laboratory promptly Samples in our custody were properly <br /> disposed of after their useful life had expired <br /> Evaluation of Ground-Water Gradient <br /> The elevation of the top of each well casing was measured by RESNA using well MW-4 as <br /> the datum point. The U S G S. Quadrangle Map, Stockton West, California 1976, was used <br /> to evaluate the elevation of the ground surface around well MW-4 The tops of the <br /> monitoring and recovery wells were surveyed relative to mean sea level on September 9, <br /> 1992 The elevation of the well casing and the depth to ground water measured in each <br /> monitoring well were combined to evaluate the relative elevation of the ground-water <br /> surface in each well and the slope of the ground-water surface across the site <br />. 0318jesc <br /> 38009­4 <br />