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3 properly to allow the bunker cavity to drain. The locations of trenches will be as determined and subsequently painted out in the cavity by OWNER or AGENT. It is anticipated that the existing drainage layout can be used. Each sand bunker is to be drained with drainage trenches in a herringbone pattern with no distance between trenches or un-drained area in excess of twenty (20) feet, unless approved by OWNER or AGENT. The top of the pipe shall be set no higher than two (2) inches below the top surface of the trench and centered within the eight (8) inch width of the trench. Each drainage trench shall slope a minimum of one-half percent (.5%) and shall terminate to the low point (or points) of the sand bunker where drainage will be collected and exit via the outfall pipe. Drainage from the bunker floor shall continue downgrade at a greater depth, if necessary, to the edge of the sand bunker where OWNER or AGENT has designated the drainage exiting the sand bunker. The minimum rate of fall shall not be less than one-half percent (.5%) at any point within the drainage trenches. At the edge of the sand bunker where drainage exits, the perforated pipe shall connect to the existing outfall pipe. All areas of the sand bunkers are to be built with adequate drainage. No water will be permitted to stand in any portion of any bunker. This is to be accomplished by sub-grades draining to the herring-bone drainage system and exiting the bunker via the “outfall” connection point. 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 or via email, showing the complete drainage system. CONTRACTOR WILL NOT BE GRANTED APPROVAL TO INSTALL THE GRAVEL LAYER UNTIL AS-BUILT DOCUMENTS HAVE BEEN REVIEWED AND APPROVED BY OWNER OR AGENT. The OWNER of AGENT may waive the As-built submittal requirement if no major changes to the drainage system layout are required. OWNER or AGENT will visually inspect all drainage installation, with written sign-off required before Contractor is authorized to install the pea gravel layer in bunker cavity. Installation of new drainage lines may not require flush-out lines. However, if needed and determined by OWNER or AGENT, a flush-out line may be required for some sand bunkers. In general, flush-out lines shall extend from the top side of the main drainage line of the sand bunker and terminate to the point where it will connect to a riser and trimmed and finished as specified by OWNER or AGENT. Single flush outs will be contained in a six (6) inch diameter irrigation valve box. In instances where two flush outs are next to each other, the risers will be contained in a single ten (10) inch irrigation diameter valve box. 8. BUNKER LINER INSTALLATION Contractor will not be allowed to deviate from the Better Billy Bunker or other manufacturers specifications and must not cause any portion of the Better Billy Bunker or other approved manufacturer’s warranty to be voided or disallowed due to construction means and methods utilized by the Contractor. 8.1. Bunker Cavity Preparation The Better Billy Bunker System or other approved system must be installed in an approved bunker cavity. The area to be covered with the specified liner shall be water settled and mechanically compacted with a hand operated compacting machine to a minimum dry density of ninety-five percent (95%). Absolutely no loose soil shall remain in the bunker cavity prior to liner placement. No liner material will be placed in bunker until OWNER or AGENT has approved the bunker shape, depth, and compaction of the bunker cavity. 8.2. Gravel Layer Blanket A layer of approved gravel shall be placed over the entire floor of the bunker at a depth of two (2) inches (51mm) deep. This gravel shall be brought up the edge of the bunker leaving room for four (4) inches of bunker sand on all slopes and edges. Should machines be used to spread the gravel in the bunker cavity, care must be taken to prevent any damage to the sub-base and/or drain lines. Contractor must protect the vertical bunker edges at all times when dumping gravel along the bunker edges. The gravel selected will be sent by the Contractor to Turf & Soil Diagnostics, (613 1st Street, Linwood Kansas 6602 (913)723-3700) soils lab or other Docusign Envelope ID: 06528EA8-C8FB-4176-8C2E-D53F24B897F0