Soil Sampling Equipment (6)
- Dutch auger
- soil Punch
- Hands /Cups
- spade/shovel
- Pneumatic auger
- sample recovery auger
Problem with soil sampling contamination (4)
- contamination from samplers, from sampling devices, from well construction
- we need to decontaminate before sampling between samples, after sampling each jurisdiction (quyền hạn) has their own decontamination
- typical decontamination involves in brushes and water
- if looking at low-levels of hydrocarbon, need to follow up with 2xacetone and 2xhexane rinses
Which areas are soil sampling used for?
- Geological Evaluation / Characterization
- Pollutant Migration - Vertical horizontal movment
- Soil quality - top soil & depth for vegetation support
soil sampling is applied for
- chemical/ agriculture/ forestry analysis,
3. soil survey
Soil properties
- Naturally variable, both spatially & temporally
2. naturally heterogeneous as you move across a landscape horizon and down a profile
VOC’s analysis characteristics
- VOC’s cannot be found at the surface
2. Require to dig until located - may be on top of the water table as they are LNAPL
Preservation of VOC’s sample (3)
- zero headspaces, protect from light
- put into glass bottles not plastic
- methanol preservation: without methanol, a soi will lose 50% of VOC’s within 2hrs, 90% within 24hrs
what kind of sampling for max [ ]
take a grab/discreet sample, not a composite/ integrative
Particle size is used to determine what?
D50 analysis
D50 infor is used for what (5)
- Effective porosity
- soil types
- define soil horizons
- assess soil permeability
- assess pollutant migration - determine the behavior and transport of chemical thru grd
Soil Characterization (soil triangle)
developed at the U of A
Known the %sand, %silt, %clay at least two, you can determine the type of soil
Why have to collect VOC’s sample 60cms from furrow bottom?
due to the high mobility in soil water
Soil Sampling Program (7)
- Pollutant:
- Depth to collect samples from
- Sampling equipment
- Sampling containers
- # of sample
- Identify analytical parameters
- Identify preservation and sample storage
