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POROUS FLEXIBLE PAVING Section 02795 15-1207 a. 100 percent passing sieve size 1 inch (25 mm). b. 90-100 percent passing sieve size 3/4 inch (19 mm). C. 70-80 percent passing sieve size 3/8 inch (9 mm). d. 55-70 percent passing sieve size #4. e. 45-55 percent passing sieve size #10. f. 25-35 percent passing sieve size #40. g. 3-8 percent passing sieve size #200. 2. Provide a base course material nearly neutral in pH (range from 6.5 to 7.2) to provide adequate root zone development for turf. 3. Material may be either "pit run" or "crusher run." Avoid using clay based crusher run/pit run. Crusher run material will generally require coarse, well -draining sand conforming to AASHTO M6 or ASTM C 33 to be added to mixture (20 to 30 percent by volume) to ensure long-term porosity. 4. Alternative materials such as crushed shell, limerock, or crushed lava may be used for base course use, provided they are mixed with sharp sand (20 to 30 percent) to ensure long-term porosity, and are brought to proper compaction. Without added sand, crushed shell and limerock set up like concrete and become impervious. 5. Alternative size and/or composition of base course materials should be submitted to Invisible Structures, Inc. (Manufacturer) for approval. B. Sand Fill for Rings and Spaces Between Rings: Clean sharp sand (washed concrete sand). Choose one of the following: 1. Coarse, well -draining sand, such as washed concrete sand conforming to AASHTO M6 or ASTM C-33. 2. United States Golf Association (USGA) greens, section - sand mix "The Root Zone Mixture." C. Turf Conditioner: 1. Hydrogrow a proprietary soil amendment manufactured by Invisible Structures, Inc. and provided with Grasspave2. 2. NO SUBSTITUTIONS. D. Grass - Choose either sod or seed: Sod: Use 13 mm (0.5") thick (soil thickness) rolled sod from a reputable local grower. Species should be wear resistant, free from disease, and in excellent condition. Sod shall be grown in sand or sandy loam soils only. Sod grown in soils of clay, silt, or high organic materials such as peat, will not be accepted. PART 3 - EXECUTION 3.01 INSPECTION A. Examine subgrade and base course installed conditions. Do not start porous paving installation until unsatisfactory conditions are corrected. Check for improperly compacted trenches, debris, and improper gradients. B. For fire lane installations: prior to installing base course for turf paving, obtain approval of 5