ARCHIVED REPORTS_XR0012656 - Laserfiche WebLink

Home Browse Search

x Tater Research Corporation i QUALI'T'Y ASSURA.\CEJQUALITY CONTROL PROCEDURES Tracer Research Corporation's normal quality assurance procedures were followed in order to prevent any cross-contamination of soil gas samples. Steel probes are used only once during the day and then washed with high pressure soap and hot water spray or steam-cleaned to eliminate the possibility for cross-contamination. Enough probes are carried on each van to avoid the need to reuse any during the day. Probe adaptors (steel reducer and tubing) are used once during the course of the day and cleaned at the end of the each wonting day by balinS in the GC oven. The tubing is replaced peri-ii,ally as needed during the job to insure cleanliness and good fit. Silicone tubing (conne,,ting the adaptor to the vacuum pump) is replaced as needed to ins'are proper sealing around the syringe needle. This tubit(g does not directly contact soil gns samples. Polyethylene tubing used to collect water samples is used once then discarded to prevent cross contamination of water samples. Glass syrintres are usually used for only one sample per day and are washed and baked out at night. If they must be used twice,they are purged ' with carrier gas (nitrogen) and baked out between probe samplings. Septa through which soil gas samples are injected into the chromatograph are replaced on a daily basis to prevent possible gas leak from the chromatographic column. ! ` Analytical instruments were calibrated each day by analytical standards from Chem Service, Inc. Calibration checks are also run after approximately ' every five soil gas sampling locations. ?cc subsamplinp syringes are checked for contamination prior to Sampling reach day by injecting nitrogen carrier gas into the gas chromatograph- Prior to sampling each day, system blanks are tun to check the sampling f apparatus (probe, adaptor, 14 cc syringe) for contamination by drawin; � ' S