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June 2, 1992 F AVAN �- Beacon Station No. 492, Manteca, California w L- Soil samples selected for laboratory analysis were removed from the sampler and quickly sealed in their brass sleeves with Teflon tape and plastic caps. The sample containers were labeled in the field with the job number, sample location and depth, and date, and promptly �- placed in iced storage for transport to the laboratory. Chain of Custody Records were initiated in the field by the geologist and accompanied the samples to a laboratory certified by the State of California to perform the analyses requested. Logging_of Borings Soil cuttings and samples were logged using the Unified Soil Classification System. Samples not selected for chemical analysis and the soil in the sampler shoe were extruded in the field and examined using visual and manual methods. Logs include records of texture, color, moisture, plasticity, consistency, blow counts, and any other characteristics noted along with evidence for the presence of hydrocarbons such as soil staining, obvious product odor, and PID readings. Ground-Water Sampling The static water level in the monitoring wells was measured to the nearest 0.01-foot with a Solinst water-level sounder cleaned with a laboratory-grade detergent and water before use in each well. A clean bailer was used to obtain a sample from the surface of the water in the well. The sample was retrieved and inspected for floating product, sheen, emulsion, color, and clarity. Approximately 3 borehole volumes of water were purged from each well with a electric submersible pump. The well was then allowed to recharge to 80 percent of its initial water level. Before collecting each ground-water sample, the technician changed latex gloves and cleaned a Teflon bailer with a solution of water and a laboratory-grade, non-phosphatic detergent and rinsed the bailer with deionized water. Concentrated hydrochloric acid was ,., added to the sample bottles as required for the preservation of the samples before laboratory analysis. A sample of the formation water was then collected from the surface of the water in each well using the Teflon bailer. The water samples were sealed in ,.. laboratory-cleaned, 40-milliliter glass vials with Teflon-lined lids so that no air bubbles were present. The samples were then labeled and promptly placed in iced storage. The fluids generated during sample purging were directed into type 17E, steel, 55-gallon, liquid waste drums approved for this use by the Department of Transportation. The drums were labeled and temporarily stored onsite pending disposal. i �6. �r 0316kear 86102-7