The closing infiltration analysis includes final overlay of the Potential Infiltration Model and the BMP Model, which further reduces areas where infiltration construction may occur (Figure 11). This location and proximity analysis displays areas of green where BMP construction is permitted. Areas in red display no natural infiltration according to the Potential Infiltration Model. Ground water recharge does not occur in these areas due to impervious land uses, clay soils, or steep slopes. The grey area in the eastern portion of Hadley Valley lacks GPS points for the slope analysis. Polygons in black represent buffered hydrologic structures where BMP construction is restricted. The blue zones require groundwater testing of the DWSMA, brown needs extensive soil testing, and yellow entails both tests.