For Sprint, AT&T Mobility, and T-Mobile West locations across California and the western U.S., HELIX provides a myriad of environmental compliance services. To comply with the National Environmental Policy Act (NEPA), the Endangered Species Act (ESA), and Section 106 of the National Historic Preservation Act (NHPA), HELIX provides Phase I Environmental Site Assessments, archaeological and architectural surveys, historic building evaluations, biological surveys, Section 106 submittals including Federal Communication Commission (FCC) Forms 620/621, NEPA checklist reporting, bird nest observation reports, Native American and Native Hawaiian Tribal Nations Consultation, as well State Historic Preservation Officer (SHPO) consultation.