Height Modernization Planning Lessons Learned California Height Modernization

Height Modernization Planning: Lessons Learned California Height Modernization Projects NGS 2005 Convocation: Silver Spring, MD: October 24 -28, 2005

Ht. Mod. Projects u San Francisco Bay • Demonstration Project San Pablo/Suisun/Grizzly Bays u Sacramento/San Joaquin Delta u • 1997, 2002 u Yolo County • 1999, 2002, 2005 NGS 2005 Convocation: Silver Spring, MD: October 24 -28, 2005

Ht. Mod Projects (cont’d. ) Contra Costa County u South San Francisco Bay (CSRC contract) u Tuolumne County (County contract w/NGS & CSRC planning assistance) u Glenn County u San Joaquin Valley (CSRC contract) u • Includes two separate Caltrans projects NGS 2005 Convocation: Silver Spring, MD: October 24 -28, 2005

Ht. Mod Projects (cont’d. ) San Simeon Earthquake re-survey (Caltrans) u Caltrans North Region u USBR/USACE u San Joaquin Valley (North) u • CSRC proposed project NGS 2005 Convocation: Silver Spring, MD: October 24 -28, 2005

Project Participants Contributing Agencies: Four projects u Contractor: Three projects u Contractor w/agency participation: Six projects u Single agency: Four projects u NGS 2005 Convocation: Silver Spring, MD: October 24 -28, 2005

Project Types u Area Type: 15 Projects • All adjacent station baselines observed u Corridor Type: 2 projects • Common baseline in successive sessions NGS 2005 Convocation: Silver Spring, MD: October 24 -28, 2005

Recent Project Statistics u 2005 Yolo County: • 144 baselines (68 stations) • 29 re-observations, ~19% u 2005 USBR/USACE: • 56 baselines (31 stations) • 9 re-observations, ~16% Observation Sessions: 45 minutes u Re-observation sessions: 60 minutes u NGS 2005 Convocation: Silver Spring, MD: October 24 -28, 2005