Carole D. Johnson Eric A. White Stephanie N. Phillips Katherine L. Pappas Robert B. Hull Denis R. LeBlanc John W. Lane, Jr 2019 Zip files with raw instrument (binary) data, text (txt), comma separated (csv) files, Excel (xlsx), and xml files. Storrs, CT, USA U.S. Geological Survey http://doi.org/10.5066/F7P26X0Z R.B. Hull C.D. Johnson B.D.Stone D.R.LeBlanc T.D. McCobb S.N. Phillips K.L. Pappas J.W. Lane, Jr. 2019 Publication USA U.S.Geological Survey On June 5, 2015, transient electromagnetic (TEM) data were acquired on the baseball field at the East Falmouth, Massachusetts Elementary School approximately 30 m north the well MA-FWS-750. Transient electromagnetic induction (TEM) surveys provide resistivity soundings of the subsurface, which can be related to lithology and hydrogeology. Electrical current is cycled through a wire placed on the land surface in a transmitter loop (Tx), which in turn produces a static magnetic field. When the current is abruptly terminated, an instantaneous current is induced in the earth, and it moves downward and outward as the induced current decays with time. The decay is controlled by the resistivity of the earth. One or more receivers (Rx) at the center of the Tx loop measure the secondary magnetic field as a function of time (dB/dt). Voltage that is induced in a coil in the receiver is proportional to the rate of change of the magnetic field (dB/dt). Decaying voltage measurements at the receiver are converted to apparent resistivity, which can be inverted to recover the depth-dependent resistivity structure of the earth. The geophysical data were collected to improve understanding of the glacial history and hydrologic properties of the Cape Cod aquifer. Support is provided for correcting errors in the data release and clarification of the study conducted by the U.S. Geological Survey. Users are encouraged to review the associated journal article to understand the purpose, collection, and limitations of these data. 2015 2018 publication date Complete None planned -70.5614650 -70.5602342 41.5762190 41.5752482 ISO 19115 Topic Category geoscientificInformation environment none Groundwater Electromagnetic Time Domain Transient Electromagnetic TEM Resistivity Borehole Logging USGS Metadata Identifier USGS:5cb0cbffe4b0c3b006574147 GNIS Massachusetts Nantucket Sound East Falmouth This data release is in the public domain. Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from this data release. none Carole D. Johnson U.S. Geological Survey Hydrologist mailing and physical

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Storrs CT 06269 USA 860-487-7402 gs-w_ogw_bg_info@usgs.gov http://water.usgs.gov/ Image of the study area jpg No formal attribute accuracy tests were conducted Results were compared to published results from this area. Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record and the associated journal article for additional details. No formal positional accuracy tests were conducted No formal positional accuracy tests were conducted The methods are fully documented in the associated USGS SIR 2018 Collection: TEM data were collected using an ABEM WalkTEM unit (acquisition software Version 1.1.0.112) using a 40-m by 40-m square transmitter loop, two center-loop receivers (0.5 by 0.5 meters squared (m^2) and 10 by 10 m^2 in size), and dual currents of about 2 and 8 amperes (A), which correspond to low and high moments of 240 and 30 Hz, respectively. Measurement cycles were stacked 15 times, and 3 to 5 measurements were taken. In post processing, TEM survey data were filtered, stacked, and averaged for both transmitted currents and measurements at both receivers. The four decay curves (for both currents and both receivers) were inverted together. The TEM data were processed with ViewTEM v2.0.2.0 (http://hgg.au.dk/software) to generate an average time-series decay curve with the removal of noisy data points, including removal of early time data prior to the complete termination the current and late-time data that were below the noise floor (or in the background noise). The TEM data were inverted without constraint using both smooth model and layered model approaches using methods described by White and others, 2016. The smooth model had 20 layers, and the layered model had 5 layers. The starting model for both inversion approaches used the average resistivity for the sounding. A depth of investigation analysis was completed for the sounding using methods described by Christiansen and Auken (2012). This data release includes the raw and processed TEM data and inverted soundings showing resistivity (in ohm-meters) with depth. References: Christiansen, A. V. and Auken, E., 2012 , A global measure for depth of investigation, Geophysics, v 77, no. 4, p. WB171-WB177 7 p. doi: 10.1190/geo2011-0393.1. White, E.A., Lane, J.W., Day-Lewis, F.D., Johnson, C.D., and Werkema D, 2016, Application of frequency- and time-domain electromagnetic surveys to characterize hydrostratigraphy and landfill construction at the Amargosa Desert Research Site, Beatty, Nevada in Proceedings, SAGEEP 2016, March 20-24, 2016, Denver, Colorado: Environmental and Engineering Geophysical Society (EEGS), Denver, Colorado. 20170814 None Point 0.0197749994 0.0236166497 Decimal degrees D_WGS_1984 WGS_1984 6378137.0 298.257223563 East_Falmouth_MA_TEM.zip Transient electromagnetic surveys U.S. Geological Survey Transient electromagnetic (TEM) sounding data are provided in a compressed file East_Falmouth_MA_TEM.zip that contains the raw ASCII data files, binary files, and inversion output files. Raw data are provided in space-delimited ASCII format in files (ending in_dat.xyz) and comma-separated files (ending in .csv) with average decaying magnetic field (in V/m^2*A) for time gates arranged in column format. There are 34 time gates. Each line in the xyz file that starts with a “/” indicates a comment line with information about that survey. All terms and field names are defined in the TEM_dictionary.csv provided with this data release in TEM_dictionary.zip. Raw data files (ending in gdb) are preserved in their original and unfiltered format, which can be opened using commercially available software including ViewTEM, SPIA, and WorkBench (http://www.aarhusgeosoftware.dk/). Inversion output files are provided in space delimited ASCII format in files (ending in _inv.xyz) with resistivity (in ohm-m) for each layer of the output model. These results are output from ViewTEM (Version.2.0.2) using a smooth 20-layer inversion. Each line that starts with a “/” indicates a comment line with information about that survey. In addition, data are provided in comma-separated files (ending in .csv). All terms and field names are defined in the TEM_ data dictionary.csv provided with this data release. The East_Falmouth_MA_TEM.zip file also includes a file showing a plot of the output models in Adobe Portable Document Format (pdf). See ReadMe files for details. U.S. Geological Survey - ScienceBase mailing and physical

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Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov Data: 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 on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Processed Data: Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. readme.txt WinZip9.0 ASCII text file This ASCII text file describes the data release. http://doi.org/10.5066/F7P26X0Z None 20200818 Carole D Johnson WATER: ESP HGB Hydrologist mailing and physical

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Storrs CT 06279 United States 860-487-7402 x17 cjohnson@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998