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0 <br />I I <br />I I <br />U <br />0 <br />G <br />u <br />C� <br />ri <br />'J <br />L <br />a As <br />KLEINFELDER <br />A-2.5 Collection of BAT Probe Groundwater Samples <br />One-time groundwater samples are collected using a BAT Probe, which is an insitu groundwater <br />sampling device. The borings are first advanced to a point immediately above the desired <br />sampling depth where groundwater is encountered. A stainless steel drive tip equipped with a <br />stainless steel filter is lowered into the boring at the end of a 2.5 -inch diameter galvanized steel <br />pipe and pushed using the drill rig approximately 6 to 12 inches into the soil/aquifer formation at <br />the bottom of the boring. A sterilized, glass, vacuum sealed sampling ampoule (tube), similar to <br />a standard volatile organics (VOA) vial. is then lowered through the pipe down to the tip with a <br />cable. Between the tip and the sample tube is a double -sided hypodermic needle (syringe), <br />which simultaneously punctures the seals on the stainless steel drive tip and the septum of the <br />glass sample ampoule. The vacuum in the sample ampoule draws groundwater through the tip <br />into the glass ampoule. The glass ampoule is then pulled out of the pipe, disengaging the <br />syringe. The septum in the glass ampoule and drive tip reseals after the syringe is removed. <br />To reduce the potential for introducing contaminants into the samples, the drive tip, galvanized <br />pipe, and other equipment used for sample collection are steam cleaned and/or washed with <br />trisodium phosphate or non-phosf)h7te detergent solution and double rinsed with distilled water <br />prior to use. The sample probe and filters are cleaned in TSP solution and rinsed with methyl <br />alcohol followed by a distilled water rinse prior to use. New, factory -sterilized syringe needles, <br />O -rings, septums and sample tubes are used for each sample. <br />A-2.6 Sample Handling <br />After labeling, the sample is immediately stored in an iced cooler for transport to Kleinfelder's <br />office sample control or to the analytical laboratory. A Kleinfelder chain -of -custody form <br />accompanies the cooler. The chain -of -custody form includes Kleinfelder's name, address and <br />telephone number, the employee number of the individual who performed the sampling, the <br />sample numbers, the date and time the samples were collected, the number of containers each <br />sample occupies, the sample matrix (soil or water) and the analyses for which the samples are <br />being submitted, if any. "�Clle chain -of custody form is signed by each person who handles the <br />samples, including all Kleintelder employees and the receiving employee of office sample <br />control or the analytical laboratory when the samples are delivered. <br />20-3978-03.W36/2019766 <br />© 1999. Kleinfelder. Inc <br />Page A-3 <br />September 9, 1999 <br />