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CA ARNG Field Quality Assurance Project Plan spiked samples are used to identify matrix interferences that influence the recovery or measurements of method analytes. 9.1.7.5 Samples for MS/MSD analyses will be selected in advance by the project chemist or task leader. MS/MSD pairs will be spiked and analyzed for 5%of the total number of samples for each applicable method(project-specific requirements may vary).Additional volume of water sample will be collected for aqueous MS/MSDs;soil sample pairs for MS/MSD analyses may come from the same sample container as the field sample.The MS/MSD samples will be labeled appropriately and identified as such on the chain-of-custody(COC)records. Equipment Rinsate Blanks 9.1.7.6 Equipment rinsate samples(rinsates)are used to evaluate decontamination procedures for ,sampling equipment used for aqueous samples.The rinsate samples for groundwater sampling will be collected after the sampling equipment is subject to standard decontamination procedures by pouring ASTM Type R water over or through the sampling device and collecting the rinse water. Rinsate samples ,will generally be collected at a maximum frequency of 10%;equipment blanks may be collected more frequently at the beginning of a field effort(project-specific requirements may vary).The rinsate blanks will be analyzed for all the same parameters as the field samples collected. 9.1.7.7- Equipment blanks for soil gas sampling are collected by flushing a sampling probe with ultra- high purity(UHP)air and collecting a canister,syringe,or Tedlar®bag sample in the same manner s a field sample.The sampling probe setup is assembled, leak-checked and flushed with UHP air before the sample is collected.One equipment blank shall be collected at the beginning of each day of the field effort. Trip Blanks 9.1.7.8 Trip blanks are prepared only for samples to be analyzed for VOCs and are handled as field samples are handled.Trip blank results are used to identify possible VOC contamination of samples from sample transport,shipping,or site conditions.Sealed trip blank samples will be prepared in the laboratory using organic-free water.They will then be shipped with the sample containers to the field, stored with field samples,and returned to the laboratory with field samples. .9.1.7.9 One set of VOC trip blanks consisting of deionized(D])-distilled,ultra pure water will accompany shipments(coolers)containing samples of VOCs,since these compounds have the greatest potential for cross contamination.The collection frequency shall be one per cooler per day(project- specific requirements may vary).An effort will be made during the field activities to minimize the number of trip blanks needed through appropriate sampling activities, sample scheduling, sample packaging,and sample shipping. 9.1.8 Sample Handling and Shipment 9.1.8.1 Samples will be properly packaged before shipment and submitted to the appropriate laboratory for analysis, with a separate signed custody record enclosed in each sample cooler.Each cooler will be lined with a large plastic bag.Once in place,the cooler will be filled with"bubble wrapped"or plastic mesh covered sample bottles and packing materials.Sufficient packing material(e.g.,vermiculite)will be used to prevent sample containers from making contact during shipment.Enough double-bagged ice will be added to maintain sample temperatures at 4°C during shipment.The large inner(plastic bag) liner will be taped shut. field QAPP.DOC 9-11 May 2000