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1 <br /> June 21, 1993 <br /> ARCO Service Station No. 0548, Stockton, California Working To Restore Nature <br /> r <br /> Sample Labeline and Handling <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, 40- <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. <br /> The sample containers were labeled in the field with the site identification, monitoring well <br /> number and depth, and date, and promptly placed in iced storage for transport to the <br /> laboratory. The technician or-geologist initiated Chain of Custody Records in the field that <br /> accompanied the samples to a laboratory certified by the State of California for the analyses <br /> requested. Samples were transported to the laboratory promptly. Samples in our custody <br /> were properly disposed of after their useful life had expired. <br />• <br /> Reporting Results of Analyses <br /> Hydrocarbon constituents in soil samples are reported in units of parts per million. <br /> Hydrocarbon constituents in groundwater samples are reported by the laboratory in units <br />•. of parts per billion (ppb). The maximum contaminant levels listed in Title 22 of the <br /> California Code of Regulations for benzene, ethyibenzene, and total xylene isomers in <br /> drinking water are 1.0, 680, and 1,750 ppb, respectively. The action level established by the <br /> California Department of Health Services for toluene is 100 ppb. To conform with the <br /> laboratory reports, we report ground-water chemical data in units of ppb. <br /> Ground Water Well Surve <br /> Tom Morrow, Inc. (Morrow) of West Sacramento, California, surveyed the elevations and <br /> positions ("x" and "y" lateral coordinates) of the wellhead of the new monitoring well. <br /> Morrow measured the monitoring well with respect to a bench mark. <br />• <br />• <br />• <br /> 0331ccar <br /> 30004-8 <br />• <br />