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' • h'q K L E I N F E L D E R A-2.3 COLLECTION OF GEOPROBE SOIL AND GROUNDWATER SAMPLES The Geoprobes will be driven 7 to 8 feet below grade to first encountered groundwater. Soil samples will be obtained by driving a 3/4 inch galvanized pipe with an insert rod by air hammer to the desired sampling depth. Then, the insert rod will be removed and the open pipe driven an additional 6 to 12 inches forcing soil into the pipe end. The pipe will be removed from the hole and the end containing the soil sample will be removed and sealed with Teflon and plastic caps. Groundwater samples will be collected from the Geoprobe hole using a decontaminated bailer or a peristaltic pump with new tubing, depending on field conditions. A-2.4 PREPARATION OF SAMPLES Each sample will be 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. ' 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 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. ' A-2.6 DECONTAMINATION OF EQUIPMENT To reduce the potential for cross-contamination, Geoprobe pipe and associated equipment are steam cleaned prior to advancing each boring. In addition, sampling equipment is cleaned with a trisodium-phosphate wash and rinsed with distilled water prior to collecting each soil sample. ' 23-482276-B00/CR96S070 A-2 June 26 1996 Copyright 1996 Kleinfelder,Inc.