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' Prior to drilling at each borehole, all augers will be thoroughly steam cleaned. The split <br /> ' spoon sampler and brass sampling tube inserts will be cleaned prior to each sampling event <br /> with a non-phosphate detergent scrubbing followed by a water rinse, and a final distilled <br /> water rinse. Boreholes will be logged and soil samples will be obtained by using a modified <br /> ' California sampler under the direction of TT's field geologist. Soils will be described using <br /> the visual method of the Unified Soil Classification System (USCS). Sampling methods will <br /> ' include grab samples for soil description and examination as well as samples in <br /> decontaminated brass tubes for laboratory analysis. Samples will be obtained of vadoze zone <br /> ' soils every five feet until the borings have reached design depth. After sampling, the boring <br /> will be sealed with a betonite grout <br /> Each sample recovered, as well as representative drill cuttings will be screened for the release <br /> ' of volatile organic contaminants with an organic vapor analyzer equipped with a <br /> photoionization detector. The calibration of this instrument will be confirmed by the field <br /> geologist each day prior to use. Upon sample extraction, brass tube ends will be immediately <br /> sealed with aluminium foil and fitted with end caps to prevent the loss of volatile compounds. <br /> Each tube will be placed in a separate ziploc bag and sealed with security tape. Samples will <br /> tbe stored in a chilled ice chest and delivered to a California Department of Health Services <br /> (DHS) certified laboratory for chemical analysis. Proper chain of custody procedures will be <br /> followed. A chain of custody fort and request for analysis form will accompany the samples <br /> at all times. <br /> ' Soils produced during the drilling will be placed in drums and stored on site, pending <br /> analytical results. After receipt of analytical results have been received, they will be disposed <br /> ' properly. <br /> ' 3.3 Groundwater Sampling <br /> After installation of the monitoring well, it will be properly developed by purging until water <br /> ' clarity is established. Groundwater samples will be taken for analysis using a pre-cleaned <br /> disposable bailer. Samples will be transferred to pre-cleaned glass bottles for shipment to a <br /> ' DHS certified laboratory for analysis. Bottles will be placed in a ziploc bag and sealed with <br /> security tape. Samples will be stored in a chilled ice chest awaiting shipment to a DHS <br /> ' certified laboratory for analysis. <br /> ' MZ(11-01-91/ENGP9476 3 <br />