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water has been removed. The wells were purged with submersible pumps(new)or bailers(old wells),decontaminated as described above in Section A.6.1. Field parameters of pH,temperature,and electrical conductance were measured as the well was — purged until these parameters had stabilized within 10 percent of previous value,except in wells MW4 t,.iu MW8,which did not have enough water in casings to be purged more than one casing volume in a reasonable time. f All purge water was Contained in 55-gallon drums labeled with well number,date,contents,and facility identification. Teflon sampling bailers were used to collect five separate samples for presample field parameter measurements,to confirm field parameter stability and,therefore, representative aquifer samples. j A.6.4 Well Sampling All samples were collected with a Teflon bailer cleaned as discussed in Section A.6.1. The bailer was operated by hand on Teflon-coated stainless steel wire. The sampling personnel wore clean nitrile gloves during sampling operations and while handling sample bottles. The collectec'groundwater samples were emptied from the bailer with a bottom-emptying device directly into the sample bottles. The samples were collected in ether 40-ml glass VOA vials or I Teflon-lined septum caps. The sample bottles contained hydrochloric acid as preservative. The containers were filled with water free of headspace(i.e.,no air bubbles in the containers). e The containers were then labeled with the well number, date,location, sampler's initials. and preservative,and the sample Iabels were covered with clear waterproof tape. i The sample vials were placed in an iced cooler for delivery to DHS-certified Pace Laboratories for analysis. Standard chain-of-custody procedures followed. X.6.5 Blank i , j In addition to the groundwater s«mples,a trip blank and a decontamination blank were analyzed ! during each sampling round. A 40-m1 glass VOA bottle with a'?'eflon septum lid,filled with D1 3 water at the laboratory,functioned as a trip blank. This trip blank traveled with the sample kit fram the laboratory to the facility and back to the laboratory again in the sample containing cooler. The blank was analyzed for the same parameters as the samples to indicate if the samples have been contaminated,from whatever source,during the trip from the site to the laboratory. -- A decontamination blank was prepared in the field during well sampling. After the first well is sampled,DI water was poured into the clean,rinsed sampling bailer that was to be used for water was then emptied, as a sample,into a preserved 40 sampling the next well. This DI -m1 VOA bottle for analysis with the sarr.,,les and trip blank. The decontamination blank indicates if esrn3Ba?IW901ip. A-4