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• May 6, 1992 � CAMA Former Unocal Station 2859, Stockton, California The sample containers were labeled in the field with the site identification, monitoring well number and depth, and date, and promptly placed in iced storage for transport to the laboratory The technician or geologist initiated Chain of Custody Records in the field that accompanied the samples to a laboratory certified by the State of California for the analyses • requested Samples were transported to the laboratory promptly Samples in our custody were properly disposed of after their useful life had expired Reporting Results of An ses • Hydrocarbon constituents in soil samples are reported in units of parts per million Hydrocarbon constituents in ground-water samples are reported by the laboratory in units of parts per billion (ppb) The maximum contaminant levels listed in Title 22 of the California Code of Regulations for benzene, ethylbenzene, and total xylene isomers in drinking water are 10, 680, and 1,750 ppb, respectively The action level established by the • California Department of Health Services for toluene is 100 ppb To conform with the laboratory reports, we report groundwater chemical data in units of ppb Ground Water Well Surve • Tom Morrow, Inc (Morrow) of West Sacramento, California, surveyed the elevations and positions (Y and "y" lateral coordinates) of the wellheads of monitoring wells MW-1 to MW-7 in March 1992 Morrow measured the monitoring wells with respect to the City of Stockton bench mar i�?? t the southwest corner of the site According to Morrow personnel, Bench Mar --T?s referenced to the United States Geodetic Survey with an elevation of 10 73 feet above mean sea level The elevation of the monitoring wells were referenced to within 0 01 foot of Bench Mark 2S-2 The horizontal distances were measured to the nearest 0 1 foot The elevations were taken at a permanent notch or arrow on the well casing • • I • o317bbou 39012-9 •