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CA ARNG Field Quality Assurance Project Plan CPT/Geoprobe 9.1.5.25 The CPT and Geoprobe drill rig sounding rods can be modified for collection of groundwater samples. When using CPT, a stainless steel HydroPunch® I sampler will be attached to the CPT drill rod and advanced to the selected depth to be sampled. Once at the prescribed depth, the sampler will be retracted approximately 1 -foot to allow formation water to enter the sample chamber through the stainless steel screen. Groundwater samples will be bailed from the HydroPunch® I/Screen Point sampler tool with a stainless steel bailer and handled as described in Section 9.1.9. Groundwater samples will be transferred to laboratory prepared sample bottles, labeled, and placed immediately into a chilled cooler for storage and transport to an off-site laboratory. The samples will be stored and shipped as described in the QAPP, Sample Handling and Shipment. (Note: When using the Geoprobe, a stainless steel Screen Point Groundwater Sampler will be attached to the Geoprobe rod and driven to the desired depth.) 9.1.6 Sample Storage, Preservation, and Holding Times Sample containers are purchased and pre -cleaned and treated according to United States Environmental Protection Agency (U.S. EPA) specifications for the appropriate methods. Sampling containers that are reused (e.g., soil sleeve) are decontaminated between uses by the U.S. EPA -recommended procedures described in Section 9.3. Cleaned containers are stored separately at the contractor's staging area to prevent exposure to fuels, solvents, and other chemicals. Amber bottles shall be used for analyses that may be sensitive to photochemical reactions. The QAPP lists sample containers, storage, and preservation requirements for each method and matrix. 9.1.7 Field Quality Control 9.1.7.1 Field quality control (QC) samples are used to assess the influence of sampling procedures, equipment, and handling on the reported results. These samples will be collected as detailed in project - specific work plans (addenda to this field QAPP). The results of these field samples will be used to assess external contamination, matrix heterogeneity, and total precision associated with both sampling and analytical procedures. Field Duplicate Samples 9.1.7.2 Duplicate sample results are used to assess total precision and variability associated with laboratory analysis and sample collection procedures. Duplicate samples are collected simultaneously or sequentially from the same source/location using identical recovery techniques and are handled identically during transportation and analysis. Soil gas field duplicates will be collected simultaneously, using a "tee" configuration in the sampling manifold. 9.1.7.3 Because more information can be obtained from samples with detectable concentrations, efforts will be made to select the duplicate samples from areas with the highest potential for contamination. Field duplicates will be collected and analyzed at a rate of approximately 10% of the total number of samples (project -specific requirements may vary). The samples will be collected, numbered, packaged, and sealed in the same manner as other field samples and submitted "blind" to the laboratory. Matrix Spikes/Matrix Spike Duplicates 9.1.7.4 Matrix spike (MS) analyses will be performed in duplicate (MSD), where possible. Matrix spiking will be performed for most inorganic and organic methods. The analytical results of the duplicate field QAPP.DOC 9-10 May 2000