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KLEINFELDER Each sample is individually labeled. 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. A custody seal may be placed on the sample in such a way that any attempt to tamper with the sample is easily visible. rC-2.4 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 accompanies 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 office sample control or the analytical laboratory when the samples are delivered. ' C-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 wash and rinsed with distilled water prior to collecting each soil sample. C-2.6 Soil Cutting Disposal Drill cuttings will be placed in 55-gallon drums or wrapped in plastic and left on site for disposal by the site owner. If requested, Kleinfelder can coordinate disposal of soil and water after analytical results are available. ' C-2.7 Soil Boring Closure Upon completion of drilling and sampling, soil borings will be closed by backfilling the borings with a sand/cement grout containing a minimum of four percent bentonite. C-3 GROUNDWATER SAMPLING ' Ground water samples are collected from the monitoring wells 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-hased water-level meter. _ 3. The volume of water standing in the well was calculated by subtracting the depth-to- water measurement from the depth of the well and multiplying by the appropriate conversion factor (3.14*radius2, 0.16 for 2-inch wells, and 0.65 for 4-inch wells). 4. Three to five well-volumes of water are purged from each well using a submersible pump, bladder pump, or Teflon bailer. FR1-92-15 Page A-2 ' Copyright 1992 Kleinfelder, Inc.