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. 5639 <br /> 4.6 Preparation: <br /> (Ensure that sub-base materia/s are structurally adequate to receive designed base <br /> course, wearing course, and designed/oads. Ensure that grading and sorl porosity of the <br /> sub-base wil/provide adequate subsurface drainage.) <br /> A. Place base course materia! over existing surface, in lifts not to exceed 150 mm (6"�, <br /> compacting each lift separate(y to 92% minimum-95% maximum Modified Proctor. Leave <br /> 1"to 1.25" for Grasspave2 unif and sand or sad for Final Grade. • <br /> B. Base course depths - 6" (minimum) deep; 3" of#57 stone , under a mixture of 1" of <br /> washed #89 (318" max) and 2" of clean, compactabfe, well �iraining fill sand compacted <br /> with a motorized plate tamper or a riding roller compactor to 92% Modified P�octor. Base <br /> placed over exist'rng su�face. This creates an ideal surface for Grasspave2. Stone to <br /> sand ratio should be between 65/35 and 75/25. <br />