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A text outline of a presentation by Dr. Paul Rosenfeld and
Mr. Lawrence
Lansdale.
Project Goals
- Install
a cap to close the landfill.
- Design
a cap as ecological preserve suitable for wildlife habitat.
- Evaluate
alternative liner.
- Evaluate
naturalized plant species for landfill cap.
Advantages for
Alternative Landfill Covers
- Native
plants can increase wildlife habitat
- Wildlife
habitat is an acceptable end use from the public’s perspective leading to
community involvement
- Habitat
credits can be purchased and sold to developers
Cap Cross-Section
Typical
RCRA Landfill Cap Design
Foundation Layer
Liner Installation
Infiltration Basin
Evaluation of Karst
Root Minimization Layer
- Soil
compaction varied in places
- Grain
size was too great
- Macropores
allowed for root penetration
Root Minimization Layer
- Macropores allow root penetration
- Soil compaction was heterogenous
- Grain size of material was too great
Relationship Between Bulk Density and Root Penetration
The data used in this portion of the presentation is provided
by Dennis E.
Rolston, University of California at Davis.
Bunker
Hill Cap
Organic Matter
- Prevents
erosion
- Increases
plant productivity
- Increases
evapotranspiration
- 50-100
tons compost per acre
Planting Basins (Imprinting)
- Small basins around each plant or group of seeds
- Increases plant survival and productivity
- Increases likelihood that plants will
evapotranspirate water
Coastal California
- Native and non-native grasses
- Artemesia
californica (Coastal sage)
- Shallow evenly distributed roots
- Habitat value
Areas
Where ET Caps Are Effective
Southern
California
Native Grass Seed Mix
Erosion Control
Conclusions
- Macropores allow for
deep roots
- Site specific plant
selection
- Soil grain size
(fines)
- Shallow rooted native
grasses and shrubs
- Organic matter
increases evapotranspiration
- Basins around each
increase survival
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