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The map was derived using measured TON data as this was the<\/SPAN>most spatially and temporally complete dataset. In Southland TON and nitrate-nitrogen (NO3-<\/SPAN>N) are generally equivalent and comparable because NO3-N makes up the majority of TON in<\/SPAN>most groundwaters. On this basis TON is used as a proxy for NO3-N concentration. An<\/SPAN>understanding of how concentrations vary across the region is important to <\/SPAN>E<\/SPAN>nvironment<\/SPAN>Southland (ES) because groundwater NO3-N potentially impacts on the supply of potable water<\/SPAN>and on ecosystems.<\/SPAN><\/P><\/DIV><\/DIV><\/DIV>", "geometryType": "esriGeometryPolygon", "sourceSpatialReference": { "wkid": 2193, "latestWkid": 2193, "xyTolerance": 0.001, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -4020900, "falseY": 1900, "xyUnits": 10000, "falseZ": 0, "zUnits": 1, "falseM": 0, "mUnits": 1 }, "copyrightText": "Ton Snelder\nMonique Beyer\nBrydon Hughes\nEwen Rodway", "parentLayer": null, "subLayers": [], "minScale": 800000, "maxScale": 0, "referenceScale": 0.0, "drawingInfo": { "renderer": { "type": "classBreaks", "authoringInfo": { "type": "classedColor", "colorRamp": { "type": "algorithmic", "algorithm": "esriHSVAlgorithm", "fromColor": [ 245, 245, 0, 255 ], "toColor": [ 245, 0, 0, 255 ] }, "classificationMethod": "esriClassifyManual" }, "field": "TON", "classificationMethod": "esriClassifyManual", "minValue": 0.7, "classBreakInfos": [ { "symbol": { "type": "esriSFS", "style": "esriSFSSolid", "color": [ 108, 207, 235, 255 ], "outline": { "type": "esriSLS", "style": "esriSLSNull", "color": [ 0, 0, 0, 255 ], "width": 0 } }, "classMaxValue": 0.99, "label": "< 1" }, { "symbol": { "type": "esriSFS", "style": "esriSFSSolid", "color": [ 76, 204, 0, 255 ], "outline": { "type": "esriSLS", "style": "esriSLSNull", "color": [ 0, 0, 0, 255 ], "width": 0 } }, "classMaxValue": 3.5, "label": "1 - 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