These factors were analyzed by using the overlay technique from GIS software
packages. The positive map and negative map were established by reclassification and
constructing the buffer zone of negative areas. The positive area is defined as the area that is
suitable for the hazardous waste landfill site which is considered by the suitable characteristics of
soil and rock. The negative area is defined as the environmental sensitive receptors to be
impacted from the hazardous waste landfill site such as watershed class 1 and 2, forest, national
park, flooding areas, community, etc. The overlay technique was described below:
- High permeability soil was selected from soil group map.
- Areas from major road within 100 meters and not more than 10 kilometers were
selected from major road map.
- Groundwater table is the area as groundwater contour more than 1.5 meters was
selected from the groundwater contour map.
- Watershed class 1A, 2A and 2B were selected from the watershed map.
- High flood risk area was selected from flood risk map.
- A 300 meters buffer zone was created around stream and lake map.
- The area allows water to readily seep into the ground to replenish an aquifer,
was selected and defined as negative areas.
- A 700 meters buffer zone was created around wells map.
- A 700 meter buffer zone was created around wastewater treatment plant map.
- Forest zone C was selected from the reservation forest map.
- National park was selected national park map.
- A 5,000 meters buffer zone was created around airport map.
- A 3,000 meters buffer zone was created around community area map.
- A 100 meters buffer zone was created around heritage and mining map.
These factors were analyzed by using the overlay technique from GIS software
packages. The positive map and negative map were established by reclassification and
constructing the buffer zone of negative areas. The positive area is defined as the area that is
suitable for the hazardous waste landfill site which is considered by the suitable characteristics of
soil and rock. The negative area is defined as the environmental sensitive receptors to be
impacted from the hazardous waste landfill site such as watershed class 1 and 2, forest, national
park, flooding areas, community, etc. The overlay technique was described below:
- High permeability soil was selected from soil group map.
- Areas from major road within 100 meters and not more than 10 kilometers were
selected from major road map.
- Groundwater table is the area as groundwater contour more than 1.5 meters was
selected from the groundwater contour map.
- Watershed class 1A, 2A and 2B were selected from the watershed map.
- High flood risk area was selected from flood risk map.
- A 300 meters buffer zone was created around stream and lake map.
- The area allows water to readily seep into the ground to replenish an aquifer,
was selected and defined as negative areas.
- A 700 meters buffer zone was created around wells map.
- A 700 meter buffer zone was created around wastewater treatment plant map.
- Forest zone C was selected from the reservation forest map.
- National park was selected national park map.
- A 5,000 meters buffer zone was created around airport map.
- A 3,000 meters buffer zone was created around community area map.
- A 100 meters buffer zone was created around heritage and mining map.
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