Appendix_2_-_Landfill_Gas_Wellhead_Detail.pdf

The document is a technical drawing from the City of Palo Alto depicting detailed specifications for Landfill Gas (LFG) Wellhead Below Ground installations for Phases II A & B. The drawing provides precise engineering schematics for constructing underground utility infrastructure, specifically focusing on wellhead components, including high-traffic-rated utility vault configurations, gravel layer specifications, and lateral connection details. The technical diagram includes multiple views and cross-sections showing precise measurements, material specifications (such as PVC piping, HDPE components), and installation requirements for various elements like gate valves, couplings, and foundation layers.

The drawing specifies technical requirements for constructing wellhead infrastructure, with meticulous attention to underground utility placement, gravel backfill specifications, and structural integrity. Key technical specifications include a 1' gravel layer footing, 6" minimum dimensions for certain components, 4" pipe extensions, and specific requirements for existing vegetative and low-permeability layers. The schematic demonstrates engineering precision in designing underground infrastructure for landfill gas control systems, with detailed annotations explaining component interactions, material types, and installation methodologies relevant to the City of Palo Alto's landfill gas management infrastructure.