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Title: Sampling and Analysis Plan for Environmental Control Number: Revision Date: Page 12 of 30 Groundwater Monitoring I PUE.EN.D.026.04 2/19/2020 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, which is based on the State of Colorado Water Quality Control Commission(WQCC)Regulation No.41 —The Basic Standards for Ground Water,Agricultural Standards Table 3 (December 2016). Regulation No. 41 is periodically updated and the most recent Agricultural Standard values will be used during the sampling event. The laboratory will use analytical methods to achieve detection at or below the applicable state groundwater standard. Initially,MW-5 was to be monitored for field pH,conductivity and temperature,and in the lab for sulfate, TDS, radium-226 and radium-228. This parameter list was developed based on results from the prior St.Charles River monitoring wells,which have since been proven to not be applicable for GCC monitoring and accordingly plugged and abandoned. Potential indicator parameters for groundwater monitoring were evaluated in a report by Close Consulting Group (2016).The parameter list in Table 1 was established in TR-06, and modified by GCC to also analyze samples for Total Dissolved Solids (TDS) to obtain background data. Numeric Protection Levels other than Table Value Standards may be established by DRMS after a sufficient number of samples have been collected and analyzed. If there is insufficient volume of water for the complete laboratory analytical list, the first priority will be collection of a sample for dissolved metals analysis,followed by nitrate/nitrite, then unfiltered/unpreserved sample(s) for as many remaining analytes as possible. 5.0 DATA QUALITY,VALIDATION,AND USABILITY This section describes the data quality objectives and validation process used during review of groundwater data collected at the Site. Data validation of field and laboratory results shall be performed by a third-party contractor. 5.1 Data Quality Objectives The following section outlines the QA/QC practices employed by sampling personnel and laboratories to ensure the data collected per this SAP are accurate, precise, representative, and