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Title: Sampling and Analysis Plan for Environmental Control Number: Revision Date: Page 12 of 23 Groundwater Monitoring PUE.EN.D.026.03 10/18/2019 3.7 Field Quality Assurance/Quality Control (QA/QC) Samples Field duplicate samples and equipment rinse blanks will be collected during sampling events as described below. Field duplicates are useful in documenting combined field and laboratory precision. Field equipment rinsate blanks serve to evaluate the effectiveness of field decontamination procedures and should be collected as the final sample of the sampling event. Duplicate Samples One field duplicate sample will be collected per sampling event. Field duplicate samples are collected at the same location and time, placed in two different bottle sets, and labeled appropriately for separate analysis at the laboratory. Corresponding duplicate sample pair bottles are filled in alternating quarter-bottle increments to maximize sample homogeneity. Duplicate QC samples will be identified in a manner so as to not represent the sample site location. Designation of the sampling location where the duplicate sample is taken will be recorded in a field notebook for reference when reviewing sample results. Although the laboratory may know the sample is a duplicate, it will not know what sample has been duplicated. Equipment Rinsate Blanks In cases where non-dedicated/non-disposable sampling equipment is used,one field equipment rinsate blank sample will be collected. However, use of a water level measuring probe decontaminated in accordance with Section 3.5 will not in and of itself trigger the requirement for a field rinsate blank. A field equipment rinsate blank is prepared by passing distilled water through the sample collection or measuring equipment, transferring it to appropriate sample containers and returning it to the laboratory for analysis. 4.0 LABORATORY ANALYSIS AND ANALYTICAL PARAMETERS 4.1 Laboratory Analysis Laboratory analyses will be completed within the scope of each laboratories' quality assurance manual and analytical procedures, sample handling, and preservation techniques. Analyses are conducted following standard laboratory quality assurance (QA) and quality control (QC) procedures as required by the analytical methods. Laboratory QA/QC review procedures are presented in Section 5.2.2. Laboratory analytical reports are provided in either hardcopy or electronic format. 4.2 Laboratory Analytical Parameters As specified in TR-06, each groundwater sample will be analyzed in the laboratory for the analytes listed in Table 1. State of Colorado Table Value Standards are also presented in Table 1. The laboratory will use analytical methods to achieve detection at or below the applicable state groundwater standard.