National Ground Water Association

7:30 a.m. — Registration

8:00 a.m. — Background

• History of dewatering
• Construction sites
• Land reclamation
• Mining
• Basic dewatering technologies

9:00 a.m. — Factors to consider prior to design of a dewatering system

• Physical setting
• Dewatering objectives
• Identify areas beyond the dewatering zones that may be affected
• Identify infrastructure that may be affected
• Nature of soil and subsurface geology
• Identify all water bearing zones
• Identify all complex features (e.g., shear zones, faults, fractures)
• Hydrogeology of the site
• Expectation of problem conditions
• Aquifer characteristics
• Anisotropy
• Heterogeneity
• Stratification
• Recharge and low-permeability hydrogeologic barriers
• Issues of groundwater quality
• Disposition of extracted groundwater
• Permit requirements
• Disposal and/or treatment requirements
• Geotechnical considerations
• Soil stability
• Soil compressibility

9:45 a.m. — Break

10:00 a.m. — Geotechnical investigations prior to dewatering design

• Soil borings and sampling
• In situ test methods
• Laboratory testing of samples
• Identification of the potential side effects due to dewatering
• Aquifer characterization and groundwater quality

10:30 a.m. — Descriptions of groundwater dewatering methods and technologies

• Sumps and drains
• Well point systems
• Deep wells
• Drainage gallery/collection tunnel
• Barriers to minimize groundwater extraction requirements
• Sheet piling
• Deep soil mixing
• Grout curtains
• Low-permeability slurry walls
• Ground freezing
• Hydraulic controls
• Combinations of technologies

11:45 a.m. — Lunch

12:45 p.m. — Dewatering system design considerations

• Analytical methods for determining dewatering system design
• Numerical models for determining dewatering system design
• Dewatering requirements
• Slope stability
• Environmental impacts on groundwater levels, surface water levels, and quality during and post construction periods
• Geographical considerations
• Third-party damage
• Physical site constraints
• Impacts to water supply wells
• Disposing extracted water
• Design considerations for challenging subsurface conditions

1:45 p.m. — Practical applications for construction dewatering and case histories

• Building construction
• Tunnels
• Dams, bridges, and roads
• Etc.

2:30 p.m. — Break

2:45 p.m. — Practical applications for mine dewatering and case histories

• Rosemont — open pit in arid climate
• Las Brisas — open pit in tropical climate
• Corrego do Sitio — underground in subtropical climate

3:45 p.m. — Dewatering specifications and contracts

5:00 p.m. — Closing

Las Vegas Hilton

3000 Paradise Road

Las Vegas, Nevada 89109

800 635.7711

702 732.5111

Accommodations: NGWA has secured a limited block of rooms on a first come, first served basis at the group rate of $85 per night single/double occupancy. This rate applies to the NGWA room block and is valid until the October 29, 2011 cutoff, unless our block fills before that date. When making your reservations, be sure to mention you are attending this NGWA event. Remember, you are responsible for securing your own reservations. Make your reservations online. For guest check-in and checkout times, please contact the hotel directly.