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LEINFELE calibration form is attached. The soil contained in the cone of the sampler or in a brass tube is exposed and screened with the organic vapor detector. The vapor reading is noted as the field screening result. For the protection of the drilling crew, the organic vapor detector is also used to measure the volatile concentrations in the breathing zone prior to and during the drilling of the samples. Total ionizable hydrocarbon readings in excess of one ppmv may necessitate respiratory protection for the affected crew members. This requirement is included in the complete field health and safety plan developed for the project prior to the start of field work. A-2.5 Sample Handling After labeling, the sample is immediately stored in an iced cooler for transport to Kleinfelder's office sample control or to the analytical laboratory. A Kleinfelder chain -of - custody form is attached to the cooler. The chain -of -custody form includes Kleinfelder's name, address and telephone number, the employee number of the individual who performed the sampling, the sample numbers, the date and time the samples were collected, the number of containers each sample occupies, and the analyses for which the samples are being submitted, if any. The chain -of -custody form is signed by each person who handles the samples, including all Kleinfelder employees and the receiving employee of the analytical laboratory when the samples are delivered. A-2.6 Soil Sample Selection for Laboratory Analysis The selection of soil samples for laboratory analysis is based upon: 1) the project objectives and requirements, 2) qualitative field screening performed in the field using the organic vapor detector, and 3) field observations such as lithology, odor, discoloration, or high moisture content. Generally, samples are submitted from the bottom of the boring and from soil horizons with significant potential for contamination as indicated by the organic vapor detector, observations, and site history. Samples may be collected from regular intervals when information on concentrations versus depth is desired. Samples that are not selected for laboratory analysis are held in sample control for possible future reference. When these samples are no longer needed, they are returned to the site and are combined with the soil cuttings generated during their collection. A-2.7 Soil Boring Closure and Soil Cutting Disposal Soil borings are closed immediately after the collection and logging of soil samples. Closure is accomplished by grouting the boring with a cement/bentonite slurry or as otherwise required. Drill cuttings will be left on site for disposal by the site owner. A-3 GROUND WATER MONITORING A-3.1 Monitoring Well Construction Construction details for shallow ground water monitoring wells are as follows: o The well casing will be 4 -inch inside diameter, flush threaded joint, schedule 40 PVC pipe. o The wells will be constructed in 10 -inch diameter boreholes. FWR-92-04 Page A-2 Copyright 1992 Kleinfelder, Inc.