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0 <br />(31) <br />EXHIBIT R -2A <br />GROUNDWATER IMPACT RATING <br />The potential for groundwater contamination can be evaluated <br />based on the type of soil beneath the site and the depth <br />to groundwater. The lower the permeability of the <br />soils or the bedrock, the lower the possibility of contamination <br />and, therefore, the lower the impact rating. Also, the greater the <br />depth to groundwater, the lower the potential to impact the <br />groundwater. <br />SOIL SAND, LOAMY <br />CHARACTERISTICS SAND, SANDY <br />LOAM <br />ROCK HIGHLY FRACTURED <br />CHARACTERISTICS ROCK, FAULT ZONES <br />DEPTH TO <br />GROUNDWATER (FEET) <br />SILT, SILT CLAY, SANDY <br />LOAM, CLAY CLAY, SILTY <br />LOAM, LOAM CLAY <br />SLIGHTLY UNFRACTURED <br />TO MODERATELY AND OTHER <br />FRACTURED ROCK IMPERVIOUS <br />ROCK <br />IMPACT RATING, B <br />>30 2 1 <br />20 -30 3 2 1 <br />10 -20 4 3 2 <br /><10 5 4 3 <br />5 -22 -91 <br />