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8. Quality Assurance/Quality Control Samples At a minimum, a trip blank and a temperature blank are maintained for QA/QC purposes • A trip blank sample (TRIP) is kept with any samples being analyzed for VOCs This is a sample of clean water that is supplied by the laboratory and is transported to and from the field and to the laboratory with the field samples The designation "QCTRIPBK"or "QCTB" is used for sample name on the field label Samplers record the date that the TRIP is taken to the field for sampling, not the date that the TRIP was prepared by the laboratory on the chain-of-custody (COC) One TRIP per cooler per day is collected • Unused trip blank samples are stored at the consulting office in a cooler dedicated to this purpose The trip blank cooler is not refrigerated, but is kept in a clean location away from possible VOC contaminants • Temperature blank sample containers are supplied by the laboratory and kept in a cooler used to transport samples The temperature blank is placed in the cooler prior to going to the field and kept there until the cooler is delivered to the laboratory 9. Completion of Chain of Custody • A separate COC is completed for each day of sampling If samples are collected on separate days for the same site, a separate COC is completed for each sampling day, and the COC is always kept with the samples If samples are shipped off site for laboratory analysis, individual coolers with separate COCs are sent for each day/cooler shipped • All fields/spaces on the COC are filled out completely, and all persons having control of the samples sign the COC to show transfer of sample control between individuals At times when the field sampler is not delivering samples directly to the laboratory, the samples may be turned over to a sample manager for shipping In this instance, the sample manager takes custody of the samples, and both the sampler and sample manager sign and date the COC to clearly show custody transfer • The COC is placed inside the cooler, and a custody seal is placed on the outside of the cooler prior to shipping The receiving laboratory indicates if the cooler was received with the custody seal intact • If samples are sent to the laboratory via UPS, FEDEX, etc , this is indicated on the COC, and the sample manager indicates the date and time custody seal is placed on cooler for delivery to the shipping agent (shipping agent does not sign the COC) • For trip blanks, the COC indicates the date the TRIP was taken to the field for sampling, not the date the TRIP was prepared by the laboratory, which may appear on the VOA label • New electronic deliverable format (EDF) requirements of California AB2886 mandate that COCs and laboratory reports maintain consistent and unique names Mam\D\,nvironmental\ParmarTexaco\Workplan\042003 wpd 4