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The top and ground elevation of each tank was also measured and included as attributes.Contact: Fairfax County GIS Division Data Accessibility: Publicly available Update frequency: Every 8 yearsCreation date: 1/1/2009 Layer name: GISMGR.STORAGE_TANKS", "geometryType": "esriGeometryPolygon", "sourceSpatialReference": { "wkid": 102746, "latestWkid": 2283, "xyTolerance": 0.002, "zTolerance": 2, "mTolerance": 2, "falseX": -110512500, "falseY": -88858000, "xyUnits": 4000, "falseZ": -100, "zUnits": 4, "falseM": 0, "mUnits": 1 }, "copyrightText": "The portion of the data set in the southeastern quadrant of Fairfax County with a source of \"2007 Stereo Models\" was created by GeoDecisions/Fugro EarthData, Inc. The portion of the data set in the rest of the County and with a source of \"2009 Stereo Models\" in the southeastern quadrant was created by GeoDecisions/Infotech, Inc. All quadrants were under contract to Fairfax County. Quality control checks were performed by Plangraphics. 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