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r <br /> Frontier Transportutio11. Inc. B23502 �1 <br /> ' October 16, 7996 Page A-5 <br /> Some monitoring wells are expected to be evacuated to dryness after removing fewer <br /> than three casing voluizles. These tow-yield monitoring wells are allowed to recharge for <br /> as long as 24 hours. Samples are collected as soon as the monitoring wells have <br /> recharged sufficiently to allow sample collection. if insufficient water has recharged after <br /> ' 24 hours, the monitoring well is recorded as "dry" for the sampling event. <br /> Purged water is containerized in Department of Transportation-approved drums, and <br /> stored on site in an area inaccessible to the general public. The purged water is typically <br /> characterized wither by sampling it, or on the basis of the groundwater sample analytical <br /> results. Twining can recommend an appropriate method for disposition of the purged <br /> water. Disposal will be the responsibility of the client. <br /> Water samples are transferred into sample containers supplied by the analytical <br /> ' laboratory. Sample containers are labelled and placed in an ice-cooled chest, equipped <br /> with a thermometer, for transport to the laboratory. The temperature inside the ice- <br /> cooled chest are recorded on chain of custody documents when samples are placed in the <br /> chest, and when they are received by the laboratory. Samples will be maintained at a <br /> temperature of approximately 4 degrees Centigrade. <br /> A-6_ Standard Operating Procedures for Equipment Decontamination: Proper <br /> decontamination procedures reduce the potential for: cross-contamination among sample <br /> locations; and introduction of contamination from outside sources. <br /> r <br /> Before, during, and fallowing drilling operations, drilling equipment is thoroughly <br /> ' cleaned using a high pressure hot water (steam) washer. Well casing, screen, end caps, <br /> and centralizers will also be cleaned using the steam washer. <br /> Steam cleaning condensate will be containerized for later disposal. Generally, disposal <br /> will be the client's responsibility. <br /> Sampling equipment and any tools, measuring devices, or other equipment which will <br /> contact soil, groundwater. or any media being assessed will be washed in a low-phosphate <br /> soap and water solution. and rinsed in clean water before each use. The type of soap <br /> used will depend upon project requirements. <br /> A-7 .Standard Operating Procedures for Sample Handling and Chain-of-Custody: <br /> Records are developed for samples which include: sampling date, sample type, location, <br /> r job number, name of sampling personnel, and methodof preservation. Each sample <br /> container is labelled immediately following collection. Chain-of-custody protocol, as <br /> ' described in United States Environmental Protection Agency, 1986, Test Methods for <br /> Evaluating,-Solid Waste, SW-546, Third Edition, is followed. Samples will be maintained <br /> at approximately 4°C. Upon arrival at the laboratory, the samples will be preserved for <br /> analysis as appropriate. <br /> r <br />