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SCJ Alliance <br />March 5, 2025 <br />Project No. NCP2025-076 <br />• Collect and examine representative soil samples from the excavation; at least four soil <br />samples will be submitted to a geotechnical testing laboratory for grain size and moisture <br />content testing and cation exchange capacity (CEC). <br />Assumptions: <br />• The County will assist utility locating by providing a map of known utilities and painting <br />out "LOCATE" in white paint around the Site for Geosyntec to call in the public locate <br />request. This will save a site visit/trip to the to apply the paint. <br />• Geosyntec's staff and excavation subcontractor will not be subject to prevailing wage. <br />■ The field investigation will be completed in up to 2 days on Site. <br />• We assume right-of-way/access permits will be provided by the County at no cost to <br />Geosyntec. <br />■ In the event that the results and observations from the test pit and PIT are considered <br />inadequate to support development of geotechnical engineering recommendations, then we <br />will discuss the need and additional exploration with SCJ. <br />• Soil sampling does not include environmental testing or characterization. If chemically <br />impacted soils are suspected due by smell or visual characteristics (such as oily sheen) we <br />will contact the SCJ immediately. <br />• Cost of repair to unmarked or mismarked utilities, such as irrigation lines (if any) will be <br />incurred and paid for by franchise utility owner or the County. <br />Task 2 -Analysis and Reporting <br />Using the results of Task 1, we will analyze the test pit and PIT results and develop geotechnical <br />engineering recommendations for on -Site stormwater infiltration; pavement subgrade preparation <br />with base course and asphalt thickness; and general earthwork recommendations for cuts, fills, and <br />reuse of on -site material for fill. The results of our explorations and analyses will be summarized in <br />a brief formal report for review and comment. Subtasks will include: <br />• Produce test pit logs, plot of PIT data, and exploration map and share preliminary results <br />with SCJ verbally or by email. <br />• Complete detailed analysis of PIT data as well as grain size correlations to develop <br />geotechnical engineering recommendations regarding infiltration feasibility at the Site, and <br />design saturated hydraulic conductivity values for stormwater infiltration element design. <br />■ Provide geotechnical recommendations for pavement design including subgrade <br />preparation, base course thickness, and asphalt thickness. <br />• Provide general earthwork recommendations for cuts, fills, and reuse of on -site material for <br />fill. <br />• Produce a draft geotechnical engineering memorandum for SCJ review, including up to <br />1 hour or teleconference meeting time. <br />• Revise draft memorandum produce a final memorandum by addressing one -round of <br />comments (if any). The final memorandum will be signed and stamped by a geotechnical <br />engineer licensed in the state of Washington. <br />Page 2 <br />