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GV maps describe each area aquifer\u2019s relative vulnerability to groundwater contamination, with lower Index values indicating less vulnerable conditions and higher values indicating higher vulnerability. They are calculated by weighing and summing the 7 DRASTIC parameters (D \u2013 Depth to Water, R \u2013 Net Recharge, A - Aquifer Media, S \u2013 Soil Media, T \u2013 Topography, I \u2013 Impact of Vadose Zone Media, C \u2013 Hydraulic Conductivity) according to the following formula, where W is the parameter\u2019s weight and R its rating: <\/SPAN>GV Index<\/SPAN><\/SPAN>= W<\/SPAN><\/SPAN>D<\/SPAN><\/SPAN>\u2022R<\/SPAN><\/SPAN>D<\/SPAN><\/SPAN>+ W<\/SPAN><\/SPAN>R<\/SPAN><\/SPAN>\u2022R<\/SPAN><\/SPAN>R<\/SPAN><\/SPAN>+ W<\/SPAN><\/SPAN>A<\/SPAN><\/SPAN>\u2022R<\/SPAN><\/SPAN>A<\/SPAN><\/SPAN>+ W<\/SPAN><\/SPAN>S<\/SPAN><\/SPAN>\u2022R<\/SPAN><\/SPAN>S<\/SPAN><\/SPAN>+ W<\/SPAN><\/SPAN>T<\/SPAN><\/SPAN>\u2022R<\/SPAN><\/SPAN>T<\/SPAN><\/SPAN>+ W<\/SPAN><\/SPAN>I<\/SPAN><\/SPAN>\u2022R<\/SPAN><\/SPAN>I<\/SPAN><\/SPAN>+ W<\/SPAN><\/SPAN>C<\/SPAN><\/SPAN>\u2022R<\/SPAN><\/SPAN>C<\/SPAN><\/SPAN>.<\/SPAN><\/P><\/DIV><\/DIV><\/DIV>", "geometryType": "esriGeometryPolygon", "sourceSpatialReference": { "wkid": 102723, "latestWkid": 3735, "xyTolerance": 0.003280833333333333, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -119670700, "falseY": -95612900, "xyUnits": 3048.0060960121928, "falseZ": 0, "zUnits": 1, "falseM": 0, "mUnits": 1 }, "copyrightText": "C. 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