Sonia M. Ellison Eric M. Thompson Kate E. Allstadt Inge Delius 20260120 vector digital data https://www.sciencebase.gov U.S. Geological Survey https://doi.org/10.5066/P1GKCOOZ In 2001, the Alaska Division of Geological & Geophysical Surveys (DGGS) published a database compiling geotechnical borehole and well-log records in Anchorage, Alaska. This data release builds on that database, adding some additional cone penetration test (CPT) and well log records in broader areas across the state, and organizing data in a SQLite relational database using SqLite Studio. Records cover a time range from 1948 to 2020 and include data about the drilling company, type of borehole, location, elevation, hole depth, CPT and standard penetration test (SPT) data, lithology, material properties, soil classification, and water level. Not all records contain all of these data types. Records covering the Anchorage area are more systematic and comprehensive than records in the rest of the state. These data were compiled to make publicly available a digital relational database of borehole and well log records in Alaska, particularly in the Anchorage area, which contains the largest population center in Alaska. 1948 2020 observed Complete As needed Alaska -171.9141 -130.6055 69.9001 51.0690 ISO 19115 Topic Category geoscientificInformation None geotechnical borehole well log cone penetration test standard penetration test alaska anchorage USGS Metadata Identifier USGS:68c85ec4d4be0250320169a7 No access constraints. Please see 'Distribution Information' for details. These data are marked with a Creative Commons Zero v1.0 Universal (CC0-1.0) public domain dedication and do not have any use constraints. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Sonia M Ellison USGS - ROCKY MOUNTAIN REGION Geologist physical

Colorado School of Mines, 1711 Illinois St

Golden CO 80401 3032738437 sellison@usgs.gov No formal attribute accuracy tests were conducted Data have been checked for duplication, inconsistencies, and minor errors. This database is incomplete, especially outside of the Anchorage area. The focus of this database was to publish the releasable data from an original relational database (Combellick and others, 2001), which did not contain all existing data in the first place. They targeted boreholes over 50 feet deep, and well logs over 100 feet deep. We added some additional data compiled from other existing publications, but systematically searching and digitizing additional public geotechnical records was beyond the scope of this effort. R. A. Combellick J. L. Mayer K. D. Sink-Blair S. M. Weems 2001 publication n/a Alaska Division of Geological & Geophysical Surveys https://doi.org/10.14509/2664 Digital and/or Hardcopy 1948 1998 observed Combellick and others, 2001 Source for database data Alaska Department of Natural Resources 2013 publication n/a Alaska Department of Natural Resources - Information Resource Management https://dnr.alaska.gov/welts Digital and/or Hardcopy 19790501 20200626 observed WELTS, 2020 Source for database data Henry W. Coulter Ralph R. Migliaccio 1966 publication Professional Paper 542-C n/a US Geological Survey https://doi.org/10.3133/pp542c Digital and/or Hardcopy 1964 observed Coulter and Migliaccio, 1966 Source for database data Shannon & Wilson, Inc. 1964 publication Report for U.S. Army Corps of Engineers, Alaska District Digital and/or Hardcopy 1964 observed S&W, 1964a Source for database data Shannon & Wilson, Inc. 1964 publication Report for U.S. Army Corps of Engineers, Alaska District Digital and/or Hardcopy 1964 observed S&W, 1964b Source for database data Shannon & Wilson, Inc. 1995 publication Report for the Municipality of Anchorage Digital and/or Hardcopy 1993 observed S&W, 1995 Source for database data R. G. Updike C. A. Ulery 1986 publication Alaska Division of Geological & Geophysical Surveys Report of Investigations 86-3 n/a Alaska Division of Geological & Geophysical Surveys https://doi.org/10.14509/2402 Digital and/or Hardcopy 1982 observed Updike and Ulery, 1986 Source for database data In this database, we include data approved by original agreements with DGGS for public release. We recovered the digitized data tables from the initial Combellick and others (2001) database, which was in a proprietary and partially corrupted format. We reconstructed the relational database in SQLite database format. We largely preserved the structure of the original relational database, as described by Combellick and others (2001), though we converted some fields to the International System of Units (SI units) as defined in the data dictionary, and we removed some tables that were incomplete or empty. We then added additional data, primarily from the Alaska Well Log Tracking System (WELTS) database, as well as a few other publications. Systematically searching and digitizing additional public geotechnical records was beyond the scope of this effort. 2021 Universal Transverse Mercator 6 0.9996 -147.0 0.0 500000.0 0.0 coordinate pair 0.6096 0.6096 meters North_American_Datum_1927 Clarke 1866 6378206.4 294.978698213898 See Data Dictionary .csv file for database table information, which lists each column for each table and a brief description of the column content. Ellison, S.M., Thompson, E.M., Allstadt, K.E., Delius, I., 2026, Geotechnical database for Anchorage, Alaska and surrounding areas: U.S. Geological Survey data release, https://doi.org/10.5066/P1GKCOOZ. U.S. Geological Survey - ScienceBase mailing address

Denver Federal Center

Building 810

Mail Stop 302

Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P1GKCOOZ None 20260120 Sonia M Ellison USGS - ROCKY MOUNTAIN REGION Geologist physical

Colorado School of Mines, 1711 Illinois St

Golden CO 80401 3032738437 sellison@usgs.gov FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata FGDC-STD-001.1-1999