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SCJ Alliance MEMORANDUM <br />September 26, 2025 Project No. NWG0131 <br />Page 3 <br />boulders (GM and GP) with a minor component of sand with gravel (SP) in the bottom of TP-02. <br />The material was medium dense to dense, slightly to very moist and brown to orange brown. The <br />boulders were up to 14 inches in diameter. <br />Groundwater <br />Groundwater was not encountered in our explorations, and we did not observe seepage or other <br />signs of significant groundwater in our test pits. We anticipate the local groundwater to be <br />consistent with the elevation of Crystal Creek to the northeast at elevation 2068. This groundwater <br />elevation is below the depth of the improvements associated with the Project. However, localized <br />seepage and perched groundwater zones may exist depending on local subsurface conditions, <br />precipitation, changes in site use, and season. <br />Geotechnical Laboratory Testing Program <br />Geosyntec subcontracted geotechnical laboratory testing services, including moisture content and <br />particle-size analyses on a selected soil sample obtained during our field investigation. Detailed <br />descriptions of the tests and results are presented in Appendix B and the results were incorporated <br />into the exploration logs shown in Appendix A. <br />Environmental Testing and Waste Profiling <br />During test pit excavation, a Geosyntec geologist conducted field screening for observations, visual <br />and/or olfactory indications of sewage impacts, as well as indicators of contamination such as <br />petroleum or hazardous material staining, sheen, and odor. No visual and/or olfactory indications of <br />sewage impacts were observed in any of our explorations. In addition, no chemical sheen or <br />staining was observed in any of our explorations. However, we did observe a layer of coal waste <br />within the fill unit. <br />A soil sample collected from exploration TP-03 at a depth of 13 feet bgs was submitted for <br />laboratory analysis of pH, Resource Conservation and Recovery Act 8 metals plus copper, nickel, <br />and zinc, and ignitability for soil profiling and disposal purposes. We did not test the soil for fecal <br />coliform due to there being no visual or olfactory indicators of sewage. The laboratory analytical <br />report is included as Appendix C. <br />Environmental Soil Management Categories <br />Based on our observations and the analytical results of the soil investigation, Geosyntec defines two <br />soil management categories as outlined below. For stockpiling and disposal purposes, Site soils <br />were categorized as follows: <br /> Soil with coal waste: Soil with a discrete layer of coal waste was present in the upper 4 feet <br />of explorations TP-02 and -03. Any material with significant visual indicators of coal waste <br />should be segregated and stockpiled on-Site. Additional testing of this soil may be required <br />if off-site disposal of this material is desired. <br /> Other on-Site soil: No visual and/or olfactory indications of sewage or hazardous material <br />impacts were observed. If soil will be excavated and disposed of off-Site, coordination with <br />the disposal facility on acceptance of the soil could be necessary. Each disposal facility has <br />its own waste acceptance criteria, and soil quality must be reviewed by the disposal facility <br />to determine whether those criteria are met. The environmental laboratory analytical report