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POROUS FLEXIBLE PAVING Section 02795 15-1207 local fire authorities of sub -base. C. Start of installation constitutes acceptance of existing conditions and responsibility for satisfactory performance. If existing conditions are found unsatisfactory, contact Architect for resolution. 3.02 PREPARATION A. Subgrade Preparation: 1. Prepare subgrade as specified in Section 32 10 00. Verify subgrade in accordance with porous paving system manufacturer's instructions. 2. Proper subgrade preparation will enable the Grasspave2 rolls/units to connect properly and remain level and stationary after installation. 3. Excavate area allowing for unit thickness, the engineered base depth (where required), and 0.5 inch (1.25 cm) for depth of sod root zone or topsoil germination area (when applicable). 4. Provide adequate drainage from excavated area if area has potential to collect water, when working with in-place soils that have poor permeability. 5. Ensure in-place soil is relatively dry and free from standing water. 6. Uniformly grade base. 7. Level and clear base of large objects, such as rocks and pieces of wood. B. Base Preparation: 1. Install Base as specified in Section 32 10 00. Verify engineered base (if required) is installed in accordance with porous paving system manufacturer's instructions. 2. Coordinate base installation and preparation with subdrains specified in Section 33 46 00. 3. If required, place a geotextile separation layer between the natural ground and the 'engineered base'. 4. If required, install the specified sub -drain and outlet according to construction drawings. 5. Coordinate base installation and preparation with irrigation and drip irrigation lines specified in Section 32 80 00 and 32 84 13, respectively. 6. Place engineered base in lifts not to exceed 6 inches (150 mm), compacting each lift separately to 95 percent Modified Proctor. 7. Leave 1 inch (2.5 cm) of depth below final grade for porous paver unit and sand fill and 0.5 inch (1.25 cm) for depth of sod root zone or topsoil germination area (when applicable). 3.03 HYDROGROW INSTALLATION A. Spread all Hydrogrow mix provided (spreader rate = 4.53 kg per 100 m2 (10 lbs per 1076 ft2) evenly over the surface of the base course with a hand-held, or wheeled, rotary spreader. B. The Hydrogrow mix should be placed immediately before installing the Grasspave2. 3.04 GRASSPAVE2INSTALLATION A. Install the Grasspave2 units by placing units with rings facing up, and using snap -fit connectors, pegs and holes, provided to maintain proper spacing and interlock the units. Units can be easily shaped with pruning shears or knife. Units placed on curves, slopes, and high traffic areas shall be anchored to the base course, using 40d common nails with fender 0