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L, 1� KIFINFFLDER Drill cuttings will be discharged to the ground. A-3 GROUND WATER ASSESSMENT L, A-3.1 BAT Probe Sampling Ground water samples can be collected from the bottom of a boring using a soil probe LM known as the BAT Probe. The BAT probe has a penetrating filter tip which houses a 35 ml or 100 ml vacuum-sealed glass ampoule. The probe is pushed into the aquifer soil at the bottom of the boring and the seal on the ampoule is activated to allow water to flow into the ampoule. As the pressure inside the ampoule comes to equilibrium with the aquifer L• pressure, a water sample is extracted from the surrounding soil. The ampoule is then resealed and extracted from the boring. This procedure can be repeated as necessary to obtain sufficient volume for the required analysis. A-3.2 Sample Handling Once the ampoule(s) are filled and removed from the boring, they are labelled and the sample is immediately stored in an iced cooler for transport to the analytical laboratory. The label includes Kleinfelder's name, job number, the date and time the sample was �• collected, the employee number of the individual who performed the sampling, and a unique five-digit sample identification number. The sample number is then recorded on a chain-of-custody. 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. 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. LM A-3.3 Equipment Decontamination To reduce the potential for cross-contamination between borings, all BAT Probe sampling equipment is steam cleaned or washed with TSP and rinsed with deionized water prior to use in each boring. FR25-91-22 Page A-3 Copyright 1991 Meinfelder,Inc.