A. GENERAL This is an “INSTALLATION ONLY” project. Turf will be supplied by Fieldturf. Install turf in accordance with Manufacturer's instructions. The Base Contractor / Turf Contractor shall strictly adhere to the installation procedures outlined under this section. Any variance from these requirements must be accepted in writing, by the Manufacturer’s on-site representative, and submitted to the Architect/Owner, verifying that the changes do not in any way affect the warranty. B. SOIL BORINGS AND GEO-SOILS REPORT – Provided by owner C. SUB-GRADE PREPARATION AND DESIGN 1. The soil bed or sub-grade must have a minimum slope of 0.5% or more, depending on the soil analysis, from the longitudinal center of the field towards the sidelines. 2. The soil bed or sub-grade must be compacted in both directions to attain the specified compaction rate, which is generally 95% standard, Proctor. 3. The soil bed or sub-grade must be prepared to tolerances of not more than 1/2” from design grade to allow for even drainage. 4. After the existing sub-grade has been properly graded, contoured and sloped as required, it shall be compacted using ten (10) ton vibrating roller, as close as possible to 95% Proctor density. 5. A suitable geo-textile fabric is required to cover the soil bed. The fabric shall be a material suitable for the application, a porous non-woven polypropylene stabilization fabric (Mirafi 140 NL, or equal). Place over the base aggregate overlapping the seams properly. Depending on the result of the soil analysis, a moisture barrier may be substituted for the permeable geo-textile liner. If a moisture barrier is to be installed, it shall be a minimum 20 mil thick. D. INSTALLATION OF PERIMETER AND CENTER OF FIELD COLLECTORS 1. Excavate perimeter and (1) center of field drainage collector trenches minimum 20" wide and 20" deep. The trenches should be constructed with a minimum 0.5% slope commencing at the low point of the collection system and extending to the high points. Collection trenches should be void of all debris. 2. The trenches shall be backfilled using premium materials and compacted by hand tamping (or equivalent machinery) to a minimum 95% of the maximum density. 3. The fabric should be placed in the perimeter trench first. The fabric should be separate from the fabric on the field. Overlap field and trench liners at least 18" in the direction of runoff flow. 4. Overlap all seams a minimum of eight inches. When overlapping fabric, lap in direction the runoff flows. 5. Weight down the fabric with ballast to prevent fabric movement by wind. 6. Perimeter and Center of Field Collector Pipes: Place 10" O.D corrugated, perforated plastic pipes in the collector trenches. The centerline of the pipe shall coincide with the centerline of the trench. The pipe shall be capable of withstanding the anticipated loading without deformation. Each header should be designed to handle the maximum runoff related to rainfall in that particular locale. Collector headers must be drained to an acceptable, efficient storm sewer, or approved discharge outlet. Pre-manufactured fittings shall be used for all connections into the collector drainage network. 7. A minimum of 2" clean, drainable crushed stone aggregate shall be placed in the bottom of the collector trenches, on top of the geotextile. The crushed aggregate must be compacted suitably. 8. Place a minimum of 4" clean, crushed aggregate on the sides of the underdrain pipes and headers, and 6" minimum of the aggregate on top of the pipe network. Compact suitably.
