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4 approved lab for testing of the sand and gravel to ensure both materials meet the minimum “bridging” standard. This common standard is based on engineering principles that rely on the largest 15% of the sand particles "bridging" with the smallest 15% of the gravel particles. The gravel must be placed evenly and raked smooth. Prior to placement of the gravel blanket Contractor will provide OWNER or AGENT with a record drawing (As-built) of the installed drainage showing the percentages of fall. In addition to the record drawing Contractor will provide to OWNER or AGENT digital photos, on USB flash drive, showing the complete drainage system. 8.3. ST410 Polymer Binder Application ST410 POLYMER shall be sprayed by a certified and trained Better Billy Bunker or other approved manufacturer installer. Using proper pressure spray equipment, a uniform layer of ST410 POLYMER shall be applied to the gravel in the bunker at a rate of one (1) gallon of ST410 POLYMER per 30-35 square feet. The gravel must be dry (less than 15% as tested by the certified installer) at application time. The treated bunker shall be allowed to cure for approximately 24 hours prior to sand installation. NOTE: ST410 POLYMER will penetrate approximately ½ - 1 inch (12mm - 25mm) depth of the gravel. A sturdy pliable layer of glued gravel will be the result. 8.4. Inspection and Quality Control After 12-24 hours, the initial ST410 POLYMER application will have cured. Contractor will walk and inspect every square foot (meter) of each bunker at the end of the curing process. Any areas not to have received the specified rate of polymer will be marked with turf paint and re-sprayed prior to calling for a final inspection by OWNER or AGENT. Improper application or omitting of the inspection process and follow up polymer application could result in weak areas and/or loose gravel. It is the installer’s responsibility to inspect and maintain the highest standards when installing the Better Billy Bunker or approved equal. 9. SUBSURFACE IRRIGATION SYSTEM INSTALLATION In conjunction with the soil preparation needed for the sod installation, a subsurface irrigation system is to be installed around the perimeter of each renovated bunker. 9.1. Subsurface Irrigation Parts Subsurface drip line shall be Toro DL2000 (low flow) and Drip Zone Valve Kit which includes control valve, pressure regulator, Y-filter and manual ball valve. Toro air vent assembly, flush assembly fittings and all associated fittings to be supplied by Contractor. Drip line spacing to be 12 inches or as directed by the Golf Course Superintendent. 10. RE-SODDING OF DISTURBED AREAS All sand bunker banks and slopes leading away from edges that have been damaged during the bunker work shall be sodded as directed by OWNER or AGENT. If slopes are greater than 3:1, Contractor shall use wooden stakes to hold the sod in place until established. Wooden stakes must be of sufficient length to provide firm bearing. 10.1. Surface Preparation All surfaces within the areas of disturbance to be re-sodded, which are slicked or glazed shall be scarified, amended, and smoothed by floating or hand raking prior to planting. All areas to be sodded shall be floated in two directions to eliminate water holding depressions and pockets. All lumps and soil clods shall be eliminated. Soil amendments and fertilizers to be supplied by the City. 10.2. Sod Quality Sod will be cut in a uniform thickness width and length. Sod shall be delivered to the job site within twenty- four hours after being harvested. Any sod permitted to dry out or rot may be rejected if, in the judgment of OWNER or AGENT, its survival after placement is doubtful, and shall be replaced at the sole cost of the Contractor. Docusign Envelope ID: 06528EA8-C8FB-4176-8C2E-D53F24B897F0