Attachment_A_1995_Construction_Drawings___Civil_Sewer_Layout_and_Details.pdf

This is a technical design attachment containing site layout plans and construction details for a bunkhouse sewer connection project identified as BELA 349326. The document includes multiple engineering drawings and specifications for utility infrastructure installation at a remote facility.

The bunkhouse site layout shows the location of new sewer and water service connections, an existing utility corridor, parking areas, ramp landing, and an arctic utilidor box system. Key features include installation of 116 linear feet of pre-insulated water service pipe and 116 linear feet of pre-insulated sewer pipe, connection to existing sewer cleanout and infrastructure, and coordination with existing 6-inch nominal diameter steel water mains and redwood below-ground utility corridors. The elevation view of the arctic utilidor box depicts the above-ground utility distribution system. The utility trench detail specifies construction requirements including slope trench walls, 2 inches of rigid insulation above service lines, 8 inches of clear typical geoclobing with select backfill material, and 4 inches of bedding material below insulation, all with specified compaction to 95 percent maximum dry density. The sewer service lateral and arctic box details illustrate the connection methodology using insulated long-sweep 90-degree bends, 4-inch HDPE sanitary sewer service pipe with 2 percent minimum slope, water service with 6x15 aromatic copper pipe couplings, and stainless steel clamps. The arctic mechanical box drawing shows spray urethane insulation surrounding utilities, 2x4 framing, continuous 3-inch extruded polystyrene rigid insulation thermal envelope, 24-gauge galvanized steel sheet wrapping, and weathertight penetration seals.