White Shield conducted a geotechnical investigation for a sewer lagoon system serving the Sunnyside community on the Warm Springs Indian Reservation. The Indian Health service is assessing the existing two lagoons and planning for expansion with a third lagoon. We planned on performing three soil bores to 50’ depth at 2-inch diameter and constructed a piezometer to determine groundwater depth. Constant core was extracted at 10’ intervals and logged per ASTM D2488 and D5434, and sent to laboratory for analysis and classification per ASTM D2487-11. A report was prepared that includes the borehole logs, laboratory analysis, hydraulic conductivity, estimated static water levels, and a determination of groundwater gradients and flow direction.