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n n <br /> Groundwater Sampling ana Analysis Plan <br /> Former Texaco Service Station <br /> Chevron Site ID 309075 <br /> January 14, 2011 <br /> n <br /> 5.0 QUALITY ASSURANCE/QUALITY CONTROL <br /> The objectives of the overall quality assurance/quality control (QA/QC) program are outlined <br /> below. The QA/QC field samples discussed in the following sections will be collected. Table 5 <br /> also outlines the QA/QC samples to be collected. <br /> 5.1 FIELD QUALITY CONTROL CHECKS <br /> 5.1.1 Rinsate Blank (Equipment Blank) Samples <br /> Rinsate blanks are not required where dedicated or disposable sampling equipment is used. <br /> Rinsate blanks are samples of contaminant-free water poured into, or over, or pumped through <br /> the sampling device, collected in a sample bottle, and transported to the laboratory for analysis. <br /> Rinsate blanks are used to assess the effectiveness of equipment decontamination procedures. <br /> Rinsate blanks are collected immediately after the equipment has been decontaminated. The <br /> frequency requirements for collecting rinsate blank samples will be one rinse blank sample per <br /> day of groundwater sample collection when non-dedicated sampling equipment is used. The <br /> rinse blank sample shall be analyzed for all laboratory analyses requested for the environmental <br /> samples collected at the site. Rinsate blank samples shall be identified with an "R" designation <br /> and followed by the date in the yymmdd format. An example of a sample identification number <br /> for a rinsate blank sample collected on April 30, 2011 is R-110430. <br /> 5.1.2 Field Duplicates <br /> ^ A field duplicate sample is a second sample collected at the same location and time as the <br /> original sample (to replicate the original). Duplicate samples are collected simultaneously or in <br /> immediate succession, using identical recovery techniques, and treated in an identical manner <br /> during storage, transportation, and analysis. Field duplicate samples will be collected at a <br /> frequency of five percent (1 duplicate per 5 samples) of laboratory analytical samples collected. <br /> The duplicate shall be analyzed for all laboratory analyses requested for the parent sample <br /> collected at the site. The sample containers are assigned an identification number in the field <br /> such that they cannot be identified (blind duplicate) as duplicate samples by laboratory <br /> r-, <br /> personnel performing the analysis. Groundwater duplicate samples shall be identified following <br /> a similar syntax as normal groundwater samples, with the addition of the letter "D" following the <br /> matrix descriptor "W". An example of a sample identification number for a duplicate groundwater <br /> r, sample collected from monitoring well MW-6D on April 30, 2011 is MW-6D-WD-110430. <br /> 5.1.3 Trip Blank <br /> ^ <br /> Trip blanks will be used to assess whether site samples have been exposed to non-site-related <br /> volatile constituents during storage and transport. Trip blanks will be analyzed at a frequency of <br /> one per sampling set. A trip blank will consist of a container filled with analyte-free water <br /> \\CA5FP\Data\Aproject\ENV\CHEVRON\309075\6 Deliverables\Work Plan\SAP\309075_SAP_6671110950.doc 7 <br />