Steven Sobieszczyk 2011 vector digital data http://water.usgs.gov/lookup/getspatial?septicSystems_MRB7 Septic systems are useful for removing and processing human waste. However, they have the potential of leaking or discharging waste into the nearby system and increasing potential contamination of nearby streams. Data represent potential locations of septic sewers in the Pacific Northwest based on extrapolation of 1990 Census tract block group level information. This data set represents the distribution of septic sewer locations in the Pacific Northwest. The number of septic systems was based on 1990 US Census counts by census tract block group. Point locations were generated and randomly distributed across each census tract block group. 1990 ground condition Complete None planned -127.113211 -108.485666 50.883779 39.171856 None septic census inlandWaters None Washington Oregon Idaho Montana Wyoming Pacific Northwest Columbia River Basin Puget Sound None 1990 2002 None. The U.S. Geological Survey should be acknowledged as the data source in products derived from these data. U.S. Geological Survey Steven Sobieszczyk Hydrologist mailing and physical address

2130 SW 5th Ave.

Portland OR 97201 USA 503-251-3208 503-251-3470 ssobie@usgs.gov Warning: Although accurate at the time of production, this information may have become obsolete. See the Metadata_Reference_Information section for a current contact. http://water.usgs.gov/GIS/browse/SepticSystems_MRB7.gif Illustration of Location of Septic Sewer Systems in the Pacific Northwest GIF U.S. Census Bureau and U.S. Geological Survey Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.4000 Brakebill, J.W Terziotti, S.E. 2011 1.0 vector digital data http://water.usgs.gov/GIS/metadata/usgswrd/XML/mrb_e2rf1ws.xml U.S. Census Bureau 1991 tabular digital data http://censtats.census.gov/pl94/pl94.shtml Data are census-tract size or larger. (1:12,000 or greater) Data represent best possible distribution of septic sewer systems based on available 1990 census tract data. Data are complete. N/A N/A U.S. Census Bureau 1990 1.0 vector digital data Washington, D.C. U.S. Bureau of the Census http://www.census.gov/geo/www/cob/bg1990.html online 1990 publication date USBG90 Data represents block group boundaries from 1990 U.S. Census Bureau tract information. U.S. Census Bureau 1991 tabular digital data CD-ROM 1990 publication date USPOP90 This U.S. Census source provided the tabular population and land area variables, such as public versus septic sewers, used for populating block group shapefile. Hawthorne Beyer 2007 3.27 model SpatialEcology.com http://www.spatialecology.com/htools/tooldesc.php online 2007 publication date HTOOL Hawth's Analysis Tools for ArcGIS - Generate Random Points Tool Brakebill, J.W Terziotti, S.E. 2011 1.0 vector digital data http://water.usgs.gov/GIS/metadata/usgswrd/XML/mrb_e2rf1ws.xml online 2011 publication date MRB_E2RF1WS Digital hydrologic network. U.S. Census Bureau spatial and tabular data were collected for the entire United States. Tabular data was joined to Census tract block group shapefile boundaries based on tract and blkgrp number. This populated the attribute table with additional variables including number of septic sewer systems by block group. USGB90 USPOP90 2008 Census tract block groups that intersected the MRB7 (Pacific Northwest) study area were filtered from the remaining national Census block groups for the rest of the country. The INTERSECT option was chosen over CLIP to retain full unit extents, rather than clip to the MRB7 basin extend. 2008 Next, the attribute "SEW_SEPT" (number of septic sewers for each block group) was used as the input variable to generate a separate point shapefile with equal amount of points per block extent. For example, if tract "X" had 152 septic systems reported in its block group, then 152 points were generated and randomly distributed within that block extent. The ArcGIS extension Hawth's Tools (HTOOL) was used to populate random points based on attribute value using the "generate random points tool." For each group, the corresponding number of points, by septic system, were generated and distributed. This was completed for all block groups within the study area. HTOOL 2008 The septic system point shapefile was then intersected with MRB7 catchments to attribute each point with a corresponding MRB7 catchment number (MRB_ID). The attribute table was then adjusted and reduced, leaving only pertinent census tract, block group, and MRB_ID data. MRB_E2RF1WS 2008 Vector NAD_1983_Albers 29.500000 45.500000 96.000000 23.000000 0.00000 0.00000 Coordinate pair 10.00000 10.00000 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 North American Vertical Datum of 1988 0.5 feet Explicit elevation coordinate included with horizontal coordinates SepticSystems_MRB7 Septic Systems U.S. Census Bureau FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. MRB_ID Major River Basin catchment ID U.S. Geological Survey 3 527405 count 1 -9999 no data - septic system not within MRB7 extent. USGS STATE State U.S. Census Bureau 16 Idaho U.S. Census 30 Montana U.S. Census 32 Nevada U.S. Census 41 Oregon U.S. Census 49 Utah U.S. Census 53 Washington U.S. Census 56 Wyoming U.S. Census COUNTY County U.S. Census Bureau Coordinates defining the features. TRACT Census tract U.S. Census Bureau Coordinates defining the features. BLKGRP Census block group U.S. Census Bureau Coordinates defining the features. Data contains Census tract information and MRB7 SPARROW model information for each septic system location. See USPOP90 and USBG90 citations. U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Downloadable Data Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. shapefile PKZIP compression Winzip 1000 http://water.usgs.gov/GIS/dsdl/SepticSystems_MRB7.zip None. This dataset is provided by USGS as a public service. 20110404 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+septicSystems_MRB7 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998