ASTM D7663-12
Standard Practice for Active Soil Gas Sampling in the Vadose Zone for Vapor Intrusion Evaluations
- Standard No.
- ASTM D7663-12
- Release Date
- 2012
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- Replace By
- ASTM D7663-12(2018)e1
- Latest
- ASTM D7663-12(2018)e1
- Scope
Soil-gas sampling results can be dependent on numerous factors both within and outside the control of the sampling personnel. Key variables are identified and briefly discussed below. Please see the documents listed in the Bibliography for more detailed information on the effect of various variables.
Application8212;The techniques described in this standard practice are suitable for collecting samples for subsequent analysis for VOCs by US EPA Method TO-15, US EPA Method TO-17, Test Method D5466, Practice D6196, or other VOC methods (for example, ISO 16017-1, US EPA Methods TO-3 and TO-12). In general, off-site analysis is employed when data are needed for input to a human health risk assessment and low- or sub-ppbv analytical sensitivity is required. On-site analysis typically has lesser analytical sensitivity and tends to be employed for screening level studies. The techniques also may prove useful for analytical categories other than VOCs, such as methane, ammonia, mercury, or hydrogen sulfide (See Test Method D5504).
Limitations:
This method only addresses collection of gas-phase species. Less volatile compounds, such as SVOCs, may be present in the environment both in the gas phase and sorbed onto particulate matter, as well as in liquid phase. In soil gas, the gas-phase fraction is the primary concern. In other potential sampling locations (for example, ambient or indoor air), however, sampling for the particulate phase fraction may also be of interest.
The data produced using this method should be representative of the soil gas concentrations in the geological materials in the immediate vicinity of the sample probe or well at the time of sample collection (that is, they represent a point-in-time and point-in-space measurement). The degree to which these data are representative of any larger areas or different times depends on numerous site-specific factors.
Effect of Purging of Dead Space8212;If a soil gas probe is to be sampled soon after installation, the gas within the probe and any sand pack will consist mostly of atmospheric air. This air must be purged before soil gas that is representative of the geologic materials can be obtained. If the probe has previously been sampled, it may be possible to collect a representative sample after a smaller volume of gas is purged, but the volume of gas in the probe tubing or pipe must be purged at a minimum. It is recommended that a minimum of three (3) dead volumes be purged from the sampling system immediately prior to sample collection. Larger purge volumes typically are not necessary to achieve stable readings and should be avoided for shallower probes or if the potential exists that the additional purging will affect the partitioning of the VOCs in the subsurface. Larger purge (and sample collection) volumes can result in migration of soil gas from locations some distance from the sampling probe. Preferential pathways within the soil may exist and so the uncertainty associated with the origin of the soil gas will tend to increase with increasing purge (and sample) volumes. The data, however, should still be representative of how VOCs will migrate in these subsurface conditions.
Effect of Sampling Rate8212;The faster the rate of sampling, the larger the pressure differential (that is, vacuum) that is induced at the point(s) where soil gas enters the sampling system. The relationship between the flow rate and the vacuum is primarily.........
ASTM D7663-12 Referenced Document
- ASTM D1356 Standard Terminology Relating to Sampling and Analysis of Atmospheres*， 2024-04-19 Update
- ASTM D1946 Standard Practice for Analysis of Reformed Gas by Gas Chromatography
- ASTM D2216 Standard Test Method for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass
- ASTM D2487 Standard Test Method for Classification Of Soils For Engineering Purposes
- ASTM D3404 Standard Guide for Measuring Matric Potential in Vadose Zone Using Tensiometers
- ASTM D4696 Standard Guide for Pore-Liquid Sampling from the Vadose Zone
- ASTM D4700 Standard Guide for Soil Sampling from the Vadose Zone
- ASTM D5088 Standard Practice for Decontamination of Field Equipment Used at Nonradioactive Waste Sites
- ASTM D5092 Standard Practice for Design and Installation of Ground Water Monitoring Wells in Aquifers
- ASTM D5314 Standard Guide for Soil Gas Monitoring in the Vadose Zone
- ASTM D5466 Standard Test Method for Determination of Volatile Organic Chemicals in Atmospheres (Canister Sampling Methodology)
- ASTM D5504 Standard Test Method for Determination of Sulfur Compounds in Natural Gas and Gaseous Fuels by Gas Chromatography and Chemiluminescence
- ASTM D6196 Standard Practice for Selection of Sorbents and Pumped Sampling/Thermal Desorption Analysis Procedures for Volatile Organic Compunds in Air
- ASTM D653 Standard Terminology Relating to Soil, Rock, and Contained Fluids
- ASTM D6725 Standard Practice for Direct Push Installation of Prepacked Screen Monitoring Wells in Unconsolidated Aquifers
- ASTM D854 Standard Test Methods for Specific Gravity of Soil Solids by the Water Displacement Method
- ASTM E2024 Standard Test Methods for Atmospheric Leaks Using a Thermal Conductivity Leak Detector
- ASTM E741 Standard Test Method for Determining Air Change in a Single Zone by Means of a Tracer Gas Dilution
- ASTM F1815 Standard Test Method for Saturated Hydraulic Conducitivity, Water Retention, Porosity, Particle Density, and Bulk Density of Putting Green and Sports Turf Root Zones
ASTM D7663-12 history
- 2018 ASTM D7663-12(2018)e1 Standard Practice for Active Soil Gas Sampling in the Vadose Zone for Vapor Intrusion Evaluations
- 2012 ASTM D7663-12 Standard Practice for Active Soil Gas Sampling in the Vadose Zone for Vapor Intrusion Evaluations
- 2011 ASTM D7663-11 Standard Practice for Active Soil Gas Sampling in the Vadose Zone for Vapor Intrusion Evaluations
