The State of Oregon has employed the use of porous asphalt concretesurfaces (E and F-mixes) since the 1970s. The use of porous mixeshas increased substantially in the past five years. Previously,no work had been done to evaluate whether the quality control/qualityassurance (QC/QA) procedures used for dense-graded mixes wereappropriate for open-graded mixes. This study consisted of a literaturereview, expert survey, and field survey of selected projects todetermine the relative importance of the constituents (e.g., asphaltcontent, gradation, voids, moisture content) on the long-termperformance of the pavement. The overall objective achieved bythis study was the development of a basis for an improved QC/QAspecification for porous pavements in Oregon. Specific objectivesachieved include: 1) evaluation of experiences of others to controlquality of open-graded mixes, 2) conducted a field survey of selectedprojects in Oregon to determine what factors most affect pavementperformance, 3) recommended modifications to existing specificationswhich would include pay adjustments, and 4) developed a plan forimplementing the resulting recommendations. This study found thatthe factors to be controlled during the production of porous pavementsinclude asphalt content, gradation, and moisture content.