Geotechnical drill-hole logs from the southern Seattle area, Washington

Abstract

One hundred sixty-four geotechnical logs are presented from drill-holes in the southern Seattle area of Washington. The logs are from a number of county and municipal sources and the original drill-hole information appeared in a number of different formats. This compilation brings into a common format lithologic descriptions, textural information, and standard penetration data from these varied sources. Water level information, water content data, and measures of Atterberg limits are presented where that information was available in the original logs. All information presented in this report was derived from previous investigations. No new information is presented that is not already available in public-domain records. Nature and Sources of Data Unless otherwise noted on the log, holes were rotary drilled and the standard penetration tests were performed with a 140 Ib. weight dropped 30 in. using a 2 in. outside diameter split-spoon sampler. Drill-hole data were derived from the following sources: bridges and highway construction from the Washington State Division of Highways, Lacey, Washington; City of Seattle municipal sewer borings from the Seattle City Engineering Department; downtown high-rise buildings and Kingdome investigations from the Seattle City Engineering Department and the King County Building Inspection Department. We would like to thank Al Kilian and LeRoy Wilson of the Washington State Department of Transportation Materials Testing Laboratory for their help in locating drill-hole information. Barry Lipnick of the Seattle Engineering Department and Charles Fulmer of the King County Planning Department provided a great deal of help in gaining access to valuable geotechnical information. Terry