Plan restoration as part of the excavation
Clarify responsibility for backfilling, surface levels, drainage and replanting after the collector is installed. The loop field and garden restoration are related but different tasks. Keep the final collector plan with utility information, and consult it before future digging. A design decision should consider both the performance of the system and the long-term use of the land.
Coordinate the site, drilling and building requirements
Washington Ecology provides a notice process for ground-source heat pump borings. Have the project team confirm the current drilling requirements and the local site, mechanical and electrical approvals that apply. A loop design and an equipment selection do not replace those checks.
See the broader geothermal heating installation options at Everett Geothermal Heating.