rainfall is not considered in the current reference design, this variable should be considered a potential exclusion variable. Reliability of the Data: This data was obtained from Scientific American: "The Amateur Scientist" 230: 122-127 (June, 1974). This map offers a general definition of the scope of the problem and is fairly reliable as of the date of its publication. As more use is made of coal for fuel purposes, the spatial coverage of this variable should increase. Therefore, this variable should be updated and perhaps even extrapolated into the future to more reasonably reflect those areas of the United States where acid rainfall represents a design constraint. Spatial Coverage: 1493 grid cells are indicated as being subject to acid rain of pH 4.0 - 5.0 and 168 grid cells are indicated being subject to acid rain of pH less than 4.0. T. STATES - FIGURE 25 For coding purposes, the grid cells had to be placed in one state or another. This informational variable is of importance only to the the extent that compilations are desirable on a state by state basis. However, since the coding of grid cells may lead to one state containing more grids than are in fact in that state, Figure 25 is offered to show the relationship of cells coded as states to state boundaries. U. CONCLUSION In conclusion, the assumptions used in assembling these maps have been set forth. While there are shortcomings in many of these data items, the overall effort should be considered credible. If this approach is considered desirable, the Rice University project team has a number of alternative approaches that should be considered in future work with respect to data collection and appropriate variables. Considering the preliminary nature of this exclusion effort, this data should be sufficient.
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