Non-marine clay shrink swell soils in Fairfax County. These are soils containing other shrinking-swelling clays that can lead to foundation distress if precautions are not taken during design and construction.

Table of properties of soil types. One to many relate with the Soils 2018 layer.

Quarries in Fairfax County.

Marumsco soils in Fairfax County. Marumsco soils are mapped in complexes with other soil types. The complexes are highly variable and consist of combinations of clays, silts, sands, and gravels. They may also be problematic. In steep areas that contain clays known as "marine clays" slope stability can be a problem. In addition, structures constructed on clays found in this complex could suffer foundation distress if adequate precautions are not taken during design and construction.

Landfill properties in Fairfax County.

This data release is a compilation of six earlier reports on natural occurrences of asbestos in the conterminous United States, which were published separately; these are Van Gosen (2005, 2006, 2007, 2008, 2010) and Van Gosen and Clinkenbeard (2011). The earlier reports were compilations divided by regions of the United States; in each report the data were provided in spreadsheet format. This data release combines the regional datasets into a single compilation for the entire conterminous United States, and includes shapefiles and spreadsheet formats. This data release provides site-by-site information on 876 natural occurrences of asbestos reported within the conterminous United States. This dataset allows the user to examine the distribution and geologic characteristics of the asbestos occurrences, which were identified by an extensive search of the geologic literature. Data on location, mineralogy, geology, and relevant literature for each asbestos site are provided in the digital files. The reported occurrences include 142 former asbestos mines, 222 former asbestos exploration prospects, and 512 other sites (occurrences) with described asbestos mineralization. A reported natural occurrence of asbestos was found in 34 of the 48 States of the conterminous United States. The data release compiles the results of an earlier study by the U.S. Geological Survey that identified and mapped the reported natural occurrences of asbestos in the contiguous United States. This study included reports for the Eastern United States (Van Gosen, 2005), the Central United States (Van Gosen, 2006), the Rocky Mountain States (Van Gosen, 2007), the Southwestern United States (Van Gosen, 2008), and the Pacific Northwest States of Oregon and Washington (Van Gosen, 2010), and California (Van Gosen and Clinkenbeard, 2011). Recently identified asbestos occurrences in southeastern Nevada, documented by Buck and others (2013) and Metcalf and Buck (2015), have been added to this compilation (not previously included in Van Gosen, 2008). This dataset was compiled through a systematic search of the published geologic literature. The search did not include unpublished documents, such as consulting or company reports. Although this asbestos dataset represents an extensive study of published literature, it should not be construed as the complete list. An asbestos site was included only when the literature specifically mentioned asbestos and (or) described the commonly recognized asbestos minerals as occurring in the asbestiform crystal habit. No attempt was made to infer the presence of asbestos if asbestos was not explicitly described. Only a small percentage of the sites were visited or sampled during this study. For descriptions of the occurrences, the user should refer to references cited for each site record. Asbestos occurrences were described from outcrop exposures or in rock exposed by exploration and mining operations. Note that these site descriptions related to the time of each report's publication. Sites may have been subsequently modified by human activities since their description. For example, site remediation may have occurred since the source literature description. All reports of asbestos mineralization found in the geologic literature (with adequate location information) were included in this study, regardless of the apparent size of the occurrence. The references cited for each asbestos site entry provide the most complete descriptions of these occurrences that was found in the literature. The descriptions range in detail from large, detailed geologic reports to a single sentence. While every attempt was made to compile a comprehensive dataset, this compilation cannot represent a complete list of the natural occurrences that exist, but rather, only those found in a systematic search of the available published geologic literature. It is possible that some published sources were missed, and it is likely that unpublished sources exist that

,,This data set is based upon the 2011 soil survey prepared by the US Department of Agriculture-Natural Resources Conservation Service. The 2011 soil survey was prepared to National Cooperative Soil Survey standards and utilized nationally recognized names for soil types. The 2018 soil map legend is identical to the 2011 legend, but the soil boundaries have been shifted to better correlate with topography and land use. This map was officially adopted by the Board of Supervisors in 2018. All construction plans submitted to the County for permits that require the inclusion of soils mapping should reference the 2018 soils map.,,

Existing land use categories for current land uses in Fairfax County as of the VALID_TO date in the attribute table. For methodology and a data dictionary please visit: https://www.fairfaxcounty.gov/demogrph/opendata/ipls-methodology-data-dictionary.pdf

Definition of terms used in manuscript's technical descriptions, tables and figure. This dataset is associated with the following publication: Wroble, J., T. Frederick, A. Frame, and D. Vallero. Comparison of soil sampling and analytical methods for asbestos at the Sumas Mountain Asbestos Site—Working towards a toolbox for better assessment. PLoS ONE. Public Library of Science, San Francisco, CA, USA, 12(7): e0180210, (2017).

The four planning areas in Fairfax County. Each area is a part of the overall County comprehensive plan.