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Site Investigation Work Plan Data Acquisition Carousel Cleaners, Sacramento, California and QA/QC Field Duplicates FDs will be collected at selected locations to evaluate the environmental variability and precision at a location. These samples will be collected using a"T"valve to allow filling the canisters simultaneously. The FDs will be handled and analyzed in the same manner as the other environmental samples. FDs will be collected and submitted for analysis at a rate of approximately 10 percent of environmental samples. Temperature Blank A temperature blank is a sample of water provided by the laboratory in a plastic bottle or volatile organic analyte vial,to be shipped in the same cooler as the field samples. The temperature blank should be clearly marked, does not require a sample number or recording on the chain-of-custody form, and should be placed at the top of the cooler for easy access by the laboratory on receipt. Temperature blanks are prepared to enable the analytical laboratory to measure a representative cooler temperature,without having to open a site sample or record a less accurate temperature reading from the air space in the cooler. Temperature blank results are used to assess sample preservation procedures during transportation. One temperature blank should accompany each cooler containing site samples.A temperature blank is applicable only to IDW water samples. Method Detection Limits Annually, at a minimum, a method detection limit(MDL) study will be performed to determine the lowest concentration at which a particular analyte can be measured and reported with a 99 percent confidence that the analyte concentration is greater than zero. The MDL is determined statistically by multiplying the appropriate one-sided 99 percent t-statistic by the standard deviation obtained from at least seven analyses of a spike containing the analytes of interest, at a concentration of 3 to 5 times the estimated MDL. Method Calibration An initial calibration must be performed at the method-specified frequency. The continuing calibration will be performed at a minimum of once daily, or if the instrument exceeds calibration limits. Calibration for each target analyte will be performed,to ensure that the analytical instrumentation is functioning within the established sensitivity range.All target analytes must be present in the initial and continuing calibrations, and these calibrations must meet the acceptance criteria specified by the respective method. Calibration standards and solutions will be of known concentration and purity,to achieve the criteria necessary for validation of the analytical results. Standards used in this program will be prepared and maintained under the normal laboratory standards tracking system,which will ensure preparation, checking, documentation, storage, and disposal according to method-specified procedures and schedules. All field equipment will be calibrated according to the manufacturer's schedule or, at a minimum,before use in the field. Laboratory Method Blanks A laboratory method blank sample analysis will be performed by the laboratory daily or per analytical batch,whichever is more frequent. The laboratory blank will undergo the entire sample preparation and 5-3