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Red Creek Quarry Baseline Water Investigation Section 4 <br /> <br /> <br />4-5 <br />DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document. <br />4.4 Water Quality Sample Collection <br />Water quality samples were collected according to the methods described in the sampling and <br />analysis plan [SAP; (BC 2023a, Appendix 3.6]. <br />4.4.1 Filtration and Preservation <br />Sample bottles with the appropriate preservative (acid or zinc acetate with sodium hydroxide) were <br />provided by the laboratory. The samples for dissolved analytes were filtered in the field using a 0.45- <br />μm disposable filter (Photo 4-5). Samples were placed on ice in a cooler after collection and <br />transported under chain-of-custody protocols to the laboratory either by BC personnel or courier. <br /> <br />Photo 4-5. Example of methods used for field filtering samples <br />4.4.2 Parameters <br />The analytes and method detection limits for the baseline program include biological, inorganic, and <br />radiological analytes listed in the Colorado Water Quality Control Commission (WQCC) groundwater <br />standards §5 CCR 1002-41 (Regulation No. 41) and surface water §5 CCR 1002-32 (Regulation <br />No. 32). Direct comparisons to the water quality standards are not applicable for baseline data; <br />however, the water quality standards indicate naturally occurring constituents that are elevated <br />above regulatory standards. The analyte list also includes cation and anion constituents to establish <br />comparison data between groundwater and surface water sources. The analyte list was reduced <br />after the first quarterly sampling event (3Q 2022). The justification for removal of selected analytes <br />was described in a Technical Revisions Letter to DRSM (Appendix D). <br />The following parameters were removed from the analytical suite: <br />• Total coliforms, phenols, and chlorophenol were removed from the groundwater suite <br />• Asbestos, cyanide, corrosivity (Langelier Saturation Index), nitrate–nitrite, foaming agents, odor, <br />and color were removed from both the groundwater and surface water suites