1130 RAINIER AVE Geotech Report 2025-07-28

Everett Housing Authority JN 12080 May 16, 2012 Page 2 drilling process, logged the test borings, and obtained representative samples of the soil encountered. The Test Boring Logs are attached as Plates 3 through 8. Soil Conditions The upper soil revealed in the test borings was loose fill soil that ranged from a few feet up to about 8.5 feet. In general, medium-dense silty sand/sandy silt was revealed below the fill in the two southwestern test borings (1 and 2) and the northeastern test boring (4). Very dense, gravelly silty sand was revealed below these soils at depths (below ground surface) in these three test borings of approximately 5 to 10 feet. In the three southeastern test borings, soft, organic peat soil was revealed below the peat down to approximately 8 to 10 feet below the ground surface. The peat is underlain by soft/loose silt and clay soils. At depths of approximately 11 to 16 feet in these test holes, the very dense, gravelly silty sand was revealed. No obstructions were revealed by our explorations. However, debris, buried utilities, and old foundation and slab elements are commonly encountered on sites that have had previous development. Groundwater Conditions No groundwater seepage was observed in the test borings; however, they were left open for only a short time period. Therefore, the lack of seepage may not indicate the static groundwater level. Groundwater levels encountered during drilling can be .deceptive, because seepage into the boring can be blocked or slowed by the auger itself. It should be noted that groundwater levels vary seasonally with rainfall and other factors. It Is possible that some groundwater could be found between the looser or organic, near- surface soil and the underlying denser soil. The stratification lines on the logs represent the approximate boundaries between soil types at the exploration locations. The actual transition between soil types may be gradual, and subsurface conditions can vary between exploration locations. The logs provide specific subsurface information only at the locations tested. Where a transition in soil type occurred between samples in the borings, the depth of the transition was interpreted. The relative densities and moisture • descriptions indicated on the test boring logs are interpretive descriptions based on the conditions observed during drilling. CONCLUSIONS AND RECOMMENDATIONS GENERAL THIS SECTION CONTAINS A SUMMARY OF OUR STUDY AND FINDINGS FOR THE PURPOSES OF A GENERAL OVERVIEW ONLY. MORE SPECIFIC RECOMMENDATIONS AND CONCLUSIONS ARE CONTAINED IN THE REMAINDER OF THIS REPORT. ANY PARTY RELYING ON THIS REPORT SHOULD READ THE ENTIRE DOCUMENT. The test borings conducted for this study encountered approximately 3 to 16 feet of loose fill, native soils, and/or organic peat overlying competent medium-dense to very dense native soils. Little excavation is planned for this project because the proposed finish floors of the buildings are at or GEOTECH CONSULTANTS,INC.