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19 Cards in this Set
- Front
- Back
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What does the Technical Enforcement Guidance Document outline? |
Describes the essential components of a ground water monitoring system that meets the objectives of the RCRA. |
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How can the TEGD be broken up? |
3 different stages: Sight characterization Subsurface investigation and data collection Data interpretation and report findings |
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What are the stages of Site Characterization? |
Background research and understanding of geology and hydro geology Geological work to understand where to place monitoring wells Well design, construction, and logging |
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What is the goal of a site characterization? |
Identify potential pathways for contaminant migration in upper most aquifer Define subsurface geology and Hydrology. |
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What is included in a minimum sight investigation? |
Data review and mapping Soil Borings Material Testing and analysis Slug tests/pump tests Geophysical surveys |
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How many monitoring wells is minimum necessary number of wells? |
4 wells 1 up gradient, 3 down gradient |
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What are down gradient detection wells used for? |
Intercept contaminant flow paths |
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How can you sample multiple flow units? |
Well clusters, screened at different intervals |
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What types of drilling methods should be used to for detection/monitoring wells? |
Least damaging drilling methods. |
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What types of drilling methods should be used to for detection/monitoring wells? |
Least damaging drilling methods. |
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What drilling method should be avoided at all costs in detection wells? |
Mud rotary methods |
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What geological factor controls the well screen length? |
Geological complexity More complex = shorter screens |
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What is the purpose of assessment monitoring? |
Quantifying the rate of movement of contaminants Determine concentrations Mapping vertical extent of contaminant plume |
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What are the categories of contaminants? |
In organic chemicals Organic chemicals Disinfectants/byproducts Radio nucleides Micro organisms |
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What does MCL mean? |
Maximum contamination limit |
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What are the typical organic contaminants MCLs |
10^-3 Except Dioxin = 10^-8 |
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What are the inorganic compounds that have a MCL of 10^-2? |
Cadmium Mercury Thallium |
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What are the inorganic compounds that have a MCL of 10^-3? |
Arsenic Lead Selenium |
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What are the inorganic compounds that have a MCL of 10^1 to 10^2? |
Fluoride Nitrate Nitrite (10^2) |
