Metadata: Identification_Information: Citation: Citation_Information: Originator: Wentworth, C.M. Publication_Date: 2015 Title: Physical Subdivision and Description of the Water-Bearing Sediments of the Santa Clara Valley, California Edition: 1.0 Geospatial_Data_Presentation_Form: vector digital map Series_Name: U.S. Geological Survey Scientific Investigations Report Issue_Identification: SIR 2015-5017 Publication_Information: Publication_Place: Menlo Park, CA Publisher: U.S. Geological Survey Other_Citation_Details: Online_Linkage: http://pubs.er.usgs.gov/publication/sir20155017/ Description: Abstract: This digital map of points contains all the wells, constructed points, and seismic reflection points used in defining and gridding the sedimentary cycle boundaries (C-2 through C8) and their internal top/bottom surfaces (C2b through C8b). Control for the boundaries of cycle 1 (C1) and its internal top/bottom surface (C1b) are separately presented in digital map wells1. Assembly of the wells and other points in this database is described in the text of the report. Locations of the points are approximate. The wells represent a small, scattered sample of the many thousands of wells in the Santa Clara Valley. Sources: The locations and primary data for the wells were obtained from various sources (below), ground elevations are largely from a USGS 30-m elevation grid derived from 1:24,000 topographic contours (Graham and Pike, 1998), and depths and elevations of the various sedimentary boundaries were determined by the authors from the well records or the reflection profile; estimated elevations for those boundaries were determined by the authors. Eight of the wells with geophysical logs (Newhouse and others, 2004; table 1) were drilled in 2000-2003 by the U.S. Geological Survey for the Santa Clara Valley Water District. Geophysical logs were also obtained for fourteen other wells in the valley, including (1) wells from the cities of Palo Alto (well codes ELCM and ROTH), Mountain View (MTNV), and Saratoga (HTOR), (2) two wells drilled for emplacement of vertical extensometers in the valley for J.F. Poland in 1960 (SUNY and SJXT; Poland and Ireland, 1988), and (3) a deep well drilled at Ames Research Center, Moffett Field, in 1973 (MOFT; Beyer, 1980). The Dumbarton well (DUMB) was drilled by the U.S. Geological Survey in 1975-76 and described by Bennett (1979). Logs of three deep geotechnical wells drilled along the Dumbarton bridge alignment in 1992-93 (B-4, B-6, and B-11) were provided by the California Department of Transportation (CalTrans). Purpose: The well map provides the data and interpretation of sedimentary boundary elevations used in interpreting the sedimentary stratigraphy of the Santa Clara basin and in preparing raster grids of all the sedimentary boundaries so defined. Supplemental_Information: The 127 wells used in this study of the sedimentary section (our primary well dataset) include 105 wells represented by driller?s logs and 22 wells represented by continuous wire-line geophysical logs. Depths of the wells range from 110 to 1,535 feet, with about half greater than 700 feet. The wells are identified by codes that for some (such as GUAD) are based on well names or other features and for most (such as 731) by arbitrary numbers. The database also includes 12 points at which depths to selected horizons were determined from the Evergreen seismic reflection profile. Also included are a small number of constructed points with estimated elevations that serve to help constrain artifacts in the shape of some of the surfaces. Where both and depth and elevation are cited for a particular surface in a well, that elevation represents a horizon picked in the well log (or reflection profile). Where the depth for a cited elevation is shown as null (-9999),that elevation was estimated from nearby control in order to help constrain artifacts in the shape of the surface. Procedures_Used: Points representing the various wells and other points were assembled using workstation Arc-Info, version 9.3 (and earlier), a commercial Geographic Information System (Environmental Systems Research Institute, Redlands, California), with version 3.5 of the menu interface ALACARTE (Fitzgibbon and Wentworth, 1991; Fitzgibbon, 1991; Wentworth and Fitzgibbon, 1991). The original file is in COVERAGE (Arc-Info vector data) format and is here stored in uncompressed ARC export format. The projection used is UTM, zone 10, NAD27, Clarke 1866 spheroid, in meters. Reviews_Applied_to_Data: The report of which this file is a part was scientifically reviewed, including elevation contours derived from raster grids of the surfaces defined herein. Related_Spatial_and_Tabular_Data_Sets: Many other digital maps and raster grids accompany this report (see Appendix E). Other_References_Cited: Bennett, M.J., 1979, Depositional environments and geotechnical properties of Quaternary sediment from south San Francisco Bay, San Mateo County, California: California State University at San Jose, unpub. Masters thesis, 133 p. Beyer, L.A., 1980, Borehole gravity program of the U.S. Geological Survey (1963-1975 - brief history and basic data: U.S. Geological Survey Open-File Report 80-903, 76 p. Fitzgibbon, T.T., 1991, ALACARTE installation and system manual (version 1.0): U.S. Geological Survey, Open-File Report 91-587B. Fitzgibbon, T.T., and Wentworth, C.M., 1991, ALACARTE user interface - AML code and demonstration maps (version 1.0): U.S. Geological Survey, Open-File Report 91-587A. Graham, S.E, and Pike, R.J., 1998, Elevation Maps of the San Francisco Bay Region, California: A Digital Database: U.S. Geological Survey Open-File Report 98-625. Scale 1:275,000. Newhouse, M.W., Hanson, R.T., Wentworth, C.M., Everett, R.R., Williams, C.F., Tinsley, J.C., Noce, T.E., and Carkin, B.A., 2004, Geologic, water-chemistry, and hydrologic data from multiple-well monitoring sites and selected water-supply wells in the Santa Clara Valley, California, 1999-2003: U.S. Geological Survey, Scientific Investigations Report 2004-5250, 132 p. [http://pubs.usgs.gov/sir/2004/5250/] Poland, J.F., and Ireland, R.L., 1988, Land subsidence in the Santa Clara Valley, California, as of 1982: U.S. Geological Survey Professional Paper 497-F, 61 p. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2014 Currentness_Reference: The date given is the publication date. The information in the report is the most up-to-date available at the time of publication. Status: Progress: Pre-Publication Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -122.182 East_Bounding_Coordinate: -121.718 North_Bounding_Coordinate: 37.582 South_Bounding_Coordinate: 37.209 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Quaternary geology Theme_Keyword: surficial geology Theme_Keyword: Santa Clara Valley Theme_Keyword: Santa Clara basin Theme_Keyword: wells Theme_Keyword: cycle depths Theme_Keyword: cycle elevations Theme_Keyword: alluvium Place: Place_Keyword_Thesaurus: None Place_Keyword: United States of America Place_Keyword: California Place_Keyword: Santa Clara County Place_Keyword: San Mateo County Place_Keyword: Alameda County Stratum: Stratum_Keyword_Thesaurus: None Stratum_Keyword: cycle Temporal: Temporal_Keyword_Thesaurus: None Temporal_Keyword: Quaternary Temporal_Keyword: Pleistocene Access_Constraints: None Use_Constraints: Uses of this digital map should not violate the spatial resolution of the data. The locations of the wells and other points come from sources that do not specify location accuracies, making the locations herein only approximate. Plotting at scales larger than about 1:250,000 will not yield greater real detail, nor will extraction of XY locations from the map yield highly accurate locations. The actual uncertainty is unknown, although for most wells it is probably less than 100-200 m. Where this database is used in combination with other data of higher resolution, the resolution of the combined output will be limited by the lower resolution of these data. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Geology, Minerals, Energy and Geophysics Science Center Contact_Person: C. M. Wentworth Contact_Address: Address_Type: mailing address Address: 345 Middlefield Road, MS 973 City: Menlo Park State_or_Province: CA Postal_Code: 94025 Country: USA Browse_Graphic: Browse_Graphic_File_Name: none Browse_Graphic_File_Description: none Browse_Graphic_File_Type: none Data_Set_Credit: The digital map was compiled by C.M. Wentworth as described above (see Description). Security_Information: Security_Classification_System: None Security_Classification: Unclassified Security_Handling_Description: None Native_Data_Set_Environment: Windows, Arc-Info version 9.3 (and earlier) Cross_Reference: Citation_Information: NA Publication_Date: none Title: NA Geospatial_Data_Presentation_Form: NA Series_Information: Series_Name: NA Issue_Identification: NA Other_Citation_Details: NA Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: See Entity_Attribute_Information Quantitative_Attribute_Accuracy_Assessment: Attribute_Accuracy_Value: See Explanation Attribute_Accuracy_Explanation: Attribute accuracy is described, where appropriate, with each attribute defined in the Entity and Attribute Section. Logical_Consistency_Report: points only Completeness_Report: The report is a general-purpose map that describes a selected set of wells and other control points at small scale. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: All wells and other points are located only approximately, with uncertainties as large as 100 m or more in some cases. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Ground elevations were determined from an elevation grid that, in turn, was derived from topographic contours on USGS 1:24,000 topographic maps. Lineage: See Supplemental_Information Process_Step: Process_Description: The points in this map were compiled in workstation Arc-Info, version 9.3 (and earlier), a commercial Geographic Information System (Environmental Systems Research Institute, Redlands, California), from various sources, as listed above (see Description). Cloud_Cover: Not relevant Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point SDTS_Point_and_Vector_Object_Type: String SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 1.0 Ordinate_Resolution: 1.0 Planar_Distance_Units: METERS Geodetic_Model: Horizontal_Datum_Name: NAD27 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.98 Xshift: 0.0000000000 Yshift: 0.0000000000 longitude of central meridian: -123 latitude of projection's origin: 0.000 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: WELLS.PAT Entity_Type_Definition: Attribute table of WELLS.PAT. Entity_Type_Definition_Source: Arc-Info Attribute: Attribute_Label: - Attribute_Definition: Attribute table of WELLS.PAT. Attribute_Definition_Source: Arc-Info Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Enumerated_Domain_Value_Definition: Enumerated_Domain_Value_Definition_Source: Attribute: Attribute_Label: AREA Attribute_Definition: unused for points Attribute_Definition_Source: Computed Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: value is 0 for points Enumerated_Domain_Value_Definition: Enumerated_Domain_Value_Definition_Source: ArcInfo Attribute: Attribute_Label: PERIMETER Attribute_Definition: unused for points Attribute_Definition_Source: Computed Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: value is 0 for points Enumerated_Domain_Value_Definition: length of perimeter Enumerated_Domain_Value_Definition_Source: ArcInfo Attribute: Attribute_Label: WELLS# Attribute_Definition: Internal feature number Attribute_Definition_Source: Computed Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Sequential unique positive integer Enumerated_Domain_Value_Definition: identity of feature Enumerated_Domain_Value_Definition_Source: ArcInfo Attribute: Attribute_Label: WELL-ID Attribute_Definition: User-assigned feature number Attribute_Definition_Source: User-defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Integer Enumerated_Domain_Value_Definition: Set equal to WELLS# Enumerated_Domain_Value_Definition_Source: author Attribute: Attribute_Label: CODE Attribute_Definition: separate 3 digit or 4 character code name for each well; short label for reflection points (as, eg374) Attribute_Definition_Source: author Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 127 unique values for wells and 12 unique values for selected points along Evergreen seismic reflection profile. Enumerated_Domain_Value_Definition: identifier for well or reflection point Enumerated_Domain_Value_Definition_Source: author Attribute: Attribute_Label: GNDEL Attribute_Definition: Elevation of ground surface, in feet. Attribute_Definition_Source: Author defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Real number. Enumerated_Domain_Value_Definition: Elevation of ground surface, in feet. Enumerated_Domain_Value_Definition_Source: USGS 10-m elevation grid derived from 1:24,000 topographic contours. Attribute: Attribute_Label: DEPTH Attribute_Definition: depth of well, in feet. Attribute_Definition_Source: Author defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Real number. Enumerated_Domain_Value_Definition: depth of well, in feet. No values for Evergreen reflection stations or geotechnical wells (CGS), which are thus -999 (not -9999). Enumerated_Domain_Value_Definition_Source: various, including Leighton and others, 1995, and individual well logs and records. Attribute: Attribute_Label: USE Attribute_Definition: character string of 15 tokens indicating whether elevation is used or not in gridding each surface. Attribute_Definition_Source: Author defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Some combination of boundary code or xxx to form a sequence of 17 tokens. For a point at which all elevations are used, the value of USE would be: C1B C1C C2A C2B C2C C3B C3C C4B C4C C5B C5C C6B C6C C7B C7C C8B C8C. For those surfaces for which an elevation is not used, the token would be xxx. Enumerated_Domain_Value_Definition: character string of 15 tokens indicating whether elevation is used or not in gridding each surface. Enumerated_Domain_Value_Definition_Source: author Attribute: Attribute_Label: TYPE Attribute_Definition: type of well log or point record: driller, geophysical, seisline, or constructed. Attribute_Definition_Source: Author defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: driller Enumerated_Domain_Value_Definition: Well represented by a drillers log Enumerated_Domain_Value_Definition_Source: author Enumerated_Domain: Enumerated_Domain_Value: geophysical Enumerated_Domain_Value_Definition: Well represented by a set of geophysical logs Enumerated_Domain_Value_Definition_Source: author Enumerated_Domain: Enumerated_Domain_Value: seisline Enumerated_Domain_Value_Definition: control point selected from Evergreen seismic reflection profile Enumerated_Domain_Value_Definition_Source: author Enumerated_Domain: Enumerated_Domain_Value: constructed Enumerated_Domain_Value_Definition: control point constructed to constrain surface. Enumerated_Domain_Value_Definition_Source: author Enumerated_Domain: Enumerated_Domain_Value: geotechnical Enumerated_Domain_Value_Definition: control point from geotechnical well interpreted by California Geological Survey (CGS). Enumerated_Domain_Value_Definition_Source: author Attribute: Attribute_Label: DEPTH-NN, where NN is one of the tokens listed under USE (c1b, c1). Attribute_Definition: Depth to the surface specified by NN, in feet. Value is -9999 where no depth is available. Attribute_Definition_Source: Author defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Real number Enumerated_Domain_Value_Definition: Depth in feet. Enumerated_Domain_Value_Definition_Source: various, including Leighton and others, 1995, and individual well logs and records. Values for wells only, topo point values are null (-9999). Attribute: Attribute_Label: ELEV -NN, where NN is one of the tokens listed under USE (c1b, c1). Attribute_Definition: Depth to the surface specified by NN, in feet. Value is -9999 where no depth is available. Attribute_Definition_Source: Author defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Real number. Enumerated_Domain_Value_Definition: Elevation of the surface specified by NN, in feet. Value is null (-9999) where no depth is available. Value equals GNDEL minus DEPTH-NN for wells except CODE = CGS# (where # is 1, 2, or 3), for which values are from the source. Values for CODE = topo from GNDEL. Overview_Description: Entity_and_Attribute_Overview: This set of digital raster grids was compiled in Arc-Info, a commercial Geographic Information System (Environmental Systems Research Institute, Redlands, California). Entity_and_Attribute_Detail_Citation: This metadata report. Distribution_Information: Distributor: U.S. Geological Survey Contact_Information: Digital Form Contact_Person_Primary: Contact_Person: C.M. Wentworth Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: 345 Middlefield Rd., M/S 973 City: Menlo Park State_or_Province: CA Postal_Code: 94025 Country: USA Contact_Instructions: Please contact by mail, email (cwent@usgs.gov), or website. Resource_Description: This digital map is one of numerous vector and raster maps included with the report. Distribution_Liability: Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this publication has been subjected to careful review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. It is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Standard_Order_Process Digital_Form: Digital_Transfer_Information: Format_Name: Digital Database package, [name to be determined] Format_Version_Number: 1.0 Format_Version_Date: 2015 Format_Specification: Arc-Info v. 9.3 Format_Information_Content: 19 raster grids in ArcInfo grid format, and accompanying metadata file (this file). File_Decompression_Technique: ??? Transfer_Size: XX MB Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: ??? Fees: No fees for digital forms of the report. Ordering_Instructions: Digital files can be obtained on-line as described above at the publication web-site Metadata_Reference_Information: Metadata_Date: 2015 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: C.M. Wentworth Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: Mailing Address: 345 Middlefield Rd., M/S 973 City: Menlo Park State_or_Province: CA Postal_Code: 94025 Country: USA Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: 19940608 Metadata_Time_Convention: Local Time Metadata_Security_Information: Metadata_Security_Classification_System: None Metadata_Security_Classification: Unclassified Metadata_Security_Handling_Description: None