Ratings of these structures and their environment are empirically weighted and summed in the DRASTIC (“drastic”) method of assessing these structures’ vulnerability. When a filter pack or developed zone causes the double straight line effect, analysis of these structures ignores the first line and applies the Bouwer and Rice method or the Hvorslev method to the second line. Permeable reactive barriers are inserted into these structures (10[1])to intercept plumes. Borehole (10[1])EM (“E-M”) conductivity logs of these structures track wedge intrusion. Slug (10[1])tests (10[1]-5[1])of these structures (10[1]-5[2])use the gradient of the piezometric head (10[1])to estimate properties like storativity. These structures are less vulnerable (10[1])to contamination when they are confined, (10[2])like the Floridan (10[1])one. (10[2])In the (10[1])hydrological cycle, these structures (10[1])are recharged (10[1])by (10[1])water (10[1])moving (10[1])through (10[1])the unsaturated zone. For 10 points, (10[1])name these permeable rock layers (10[1])that store groundwater. (10[1]) (10[2])■END■