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<br />APPENDIX B <br /> <br />Proposed Surface Coverage Factor <br /> <br />Gravel walks or driveways 0.15 - 0.30 <br />Rolled base or gravel driveways 0.35 - 0.70 <br />Stone, brick, or wood block with 0.50 - 0.70 <br />open joints <br /> <br />Stone, brick, or wood block with 0.75 - 0.85 <br />cemented joints <br /> <br />Grass crete (or equivalent) 0.60 - 0.80 <br /> <br />Concrete or asphaltic concrete 1.0 <br />