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Whereas the site characterization data elements in Table 1-1 focus on the decision of where significant environmental risk exists at the ERF , those elements in Table 1-2 focus on site characterization data needed to address the applicability of remedial technologies . The barrier consisting of geocomposite covered with 10 cm of gravel was most effective . In the countryside , 48 % of the land is owned by rich absentee landowners making up 1.3 % of the rural population while the campesinos , comprising 63 % of the rural population own less than 5 % of the land , according to Fr. Giraldo 's Justicia y Paz magazine . An associative container supports unique keys if it may contain at most one element for each key . They have raised condom use from 3 percent in 1992 to over 90 percent in 1998 .