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- -h and rinsed with tap water and deionized water before use in each well, to prevent cross-contamination. The chemical parameters of J the water removed from the wells were monitored by periodically measuring the temperature, pH, and conductivity. When the chemical parameters stabilized (there was no measurable change in two consecutive bailer volumes) the groundwater was sampled. Samples of groundwater were collected with clean Teflon bailers. The bailers used to sample the groundwater were scrubbed in tri- - i sodium phosphate detergent and rinsed in tap water and then deionized water. Samples from the Teflon bailers were poured I - into 40-m1 VOA vials with Teflon-lined caps and sealed in such a way that no bubbles were formed. The samples were preserved with hydrochloric acid. All sample vials were labeled and placed in - an ice-filled cooler for storage and transport. A sample of the de-ionized water which had been used to rinse the. sampling bailers was also .collected and submitted for analysis. The samples were ,shipped under chain of custody to DHS-certified Y laboratories, where the were analyzed for total . Y petroleum hydro- carbons as gasoline .by modified EPA Method 8015 and for benzene, Lj toluene, xylenes, and ethylbenzene by EPA Method .642: The purge 3 ' water: and all. liquids derived from cleaning sampling equipment j were placed in 55-gallon drums. and stored on the siteuntil receipt of .the analytical results allowed for proper disposal. a � 7 2.5 SURVEYING AND GAUGING DEPTH TO GROUNDWATER _j The wells have been gauged periodically since December 1986 to ."_ -:-- record the -depth--to,-water--for use- in-establishing gradient direr .-3 .-. _ tion and :to inspect for the presence of floating product. Depths . to water were .measured by EA personnel with an ORS optical inter 71 j face" probe calibrated in decimal feet. "I ' e25/71050/8-89/txt 9 }