5001 23RD AVE W Geotech Report 2022-10-25

probes (B1 and B2) to evaluate subsurface soil types, consistencies and relative densities and to recommend most suitable area for proposed construction.This exploration method was used due to accessibility issues. We noted groundwater levels during exploration and at the completion of exploration. We will also review available literature to evaluate seasonal groundwater conditions in the site vicinity area. Prior to the beginning of exploration, we reviewed any information on existing on-site utilities provided by you. At the completion of exploration, boring locations were backfilled with soil cuttings and sealed at the top. All soil samples were identified in the field and were placed in sealed containers and transported to the laboratory for further testing and classification. The subsurface exploration results are shown on the individual Boring Logs included in an Appendix. The Legend and Notes necessary to interpret our Boring Logs are also included in an appendix. After the review of subsurface exploration data, it was concluded that soil conditions were competent and additional exploration was not deemed necessary. The WDP is a "relative density" exploration device which is used to determine the distribution and to estimate strength of the subsurface soil and decomposed rock units. The resistance to penetration is measured in blows-per-1/2 foot of an 11-pound hammer which free falls roughly 3.5 feet driving the '/2 inch diameter pipe into the ground. This measure of resistance to penetration can be used to estimate relative density of soils. For a more detailed description of this geotechnical exploration method, please refer to the Slope Stability Reference Guide for National Forests in the United States, Volume I, United States Department of Agriculture, EM-7170-13, August 1994, p. 317-321. A representative schematic of WDP is included in appendix along with the published data on correlation between WDP and SPT. The penetration test results are shown on the individual Borehole Log included the appendix. The Legend and Notes necessary to interpret our Borehole Logs are also included in the appendix. • Data obtained from site observations, limited subsurface exploration, laboratory evaluation, and previous experience in the area was used to perform engineering analyses. • Using the collected soil samples, we performed laboratory soil evaluation which included soil classification. • We prepared this report providing conclusions and recommendations on site stability conditions and engineering design parameters. It should be noted that our scope of services did not include any structural design or foundation engineering of any kind. Our scope of services did not include forensic evaluation or condition survey of the existing structures on the site. Our scope of work was limited to geotechnical evaluation of the area for one referenced condominium building only. Again, our scope of services did not include structural evaluation of any kind for the existing building. Our scope of services did not include detailed evaluation of any global slope stability or landslide hazards evaluation, or Project No: 0314-WA19 12 August 07,2019 Page No:2 of 12