SITE INFORMATION AND CORRESPONDENCE

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10 File No. 24-220176-FO 1 �� K L E I N F E L D E R May 11, 1994 A-2.4 Sample Handling After labeling, the sample is immediately stored in an iced cooler for transport to Meinfelder's office sample control or to the analytical laboratory. A Kleinfelder chain-of-custody form accompanies the cooler. The chain-of-custody form includes Meinfelder's name, address, and telephone number, the i' 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. When the samples are delivered, the chain-of-custody form is signed by each person who handles the samples, including all Kleinfelder employees and the receiving employee of office sample control or the analytical laboratory. A-2.5 Decontamination of Equipment To reduce the potential for cross-contamination, augers and associated equipment are steam cleaned prior to drilling each boring. In addition, sampling equipment is cleaned with a trisodium-phosphate or laboratory detergent wash and rinsed with distilled water prior to collecting each soil sample. A-2.6 Soil Cutting Disposal Drill cuttings(if applicable)are placed in 55-gallon drums or on top of and covered by polyvisquene for storage. The soil is left on site for disposal by the site owner. If requested, Meinfelder can coordinate disposal of soil and water after analytical results are available. A-2.7 Geoprobe Procedures Geoprobes will be driven and sampled by a subcontractor to Kleinfelder. An attempt to penetrate the asphaltic concrete at each location will be made. If such penetration is not possible, coring will be performed at an additional cost agreed upon by the client prior to commencement. Samples will be collected in accordance with the proposal. I A-2.8 Geoprobe Closure Upon completion of geoprobe sampling, the borings will be closed by backfilling the borings with a j neat cement grout. A-2.9 Equipment Decontamination To reduce the potential for cross-contamination between samplings, developing equipment is washed in a trisodium phosphate or lab grade detergent solution and rinsed in distilled water or steam cleaned prior to use in the next monitoring well. A-3 GROUNDWATER MONITORING A-3.1 Groundwater Sampling Groundwater samples are collected from the Geoprobes at the site. The sampling protocol for each well is as follows: 1. Down-well equipment (pumps, bailers, etc.) is decontaminated by steam cleaning, or by scrubbing in a trisodium-phosphate wash followed by a distilled water rinse, prior to use in each well. Bailer cord is replaced prior to use in each well. 2. The depth-to-water is measured using a conductivity-based water-level meter. i 24-220176-FO1/CR43-8 (1994) A-2 June 3, 1994 Copyright 1994 Kleinfelder, Inc.