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KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

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APPENDIX B<br />

SOP B1.7<br />

Soil Gas Investigation<br />

The objectives of the soil gas investigation will be to identify possible source areas and to help determine<br />

the extent of VOC and SVOC migration in the soil and groundwater. The procedures presented in this<br />

SOP provide instructions for both active and passive soil gas sample collection, although passive sample<br />

collection is the preferred method. Any other soil gas sampling techniques required by a project that do<br />

no relate to this SOP should be presented in the project-specific addenda to the BWP as part of the<br />

project work plan.<br />

Passive Soil Gas Sample Collection<br />

Passive soil gas sampling will be performed using the Gore-Sorber or EMFLUX methods for soil gas<br />

sample collection and analysis. The Environmental Technology Verification Reports produced by the<br />

U.S. Environmental Protection Agency for Soil Gas Sampling Technology for the Gore-Sorber<br />

Screening Survey (EPA, 1998) and EMFLUX Soil Gas Investigation System (EPA, 1998) can be<br />

referenced for further information.<br />

Sample Material Emplacement<br />

Sample Analysis<br />

A 5/8-inch-diameter, solid steel probe, will be driven into the ground (using DPT or manual<br />

method) and withdrawn. The depth to which the steel probe is driven, typically 3 to 4 ft, will<br />

vary based on site conditions.<br />

A hollow sampling probe will be inserted approximately 2 ft into the hole. The sampling<br />

probe will have an outside diameter slightly larger than 5/8 inch to provide a seal preventing<br />

ambient air from entering the sample hole.<br />

The insertion tool used to emplace the sampler will be inserted through the sampling probe to<br />

the desired depth and removed once placement is complete. The sample probe will then be<br />

removed from the hole leaving the sampler in place. The hole should immediately be plugged<br />

so no gases can escape. Gore-Sorber samplers should remain in place for 10 to 14 days and<br />

EMFLUX samplers should remain in place for at least 3 days.<br />

W.L. Gore and Associates, Inc. will perform all analytical laboratory work when Gore-Sorber samplers<br />

are utilized and a certified and contracted laboratory will perform the passive soil gas analysis on the<br />

EMFLUX samplers.<br />

Active Soil Gas Sample Collection<br />

Equipment<br />

A portable gas chromatograph (GC) (such as a Photovac Model 10S70) will be used to analyze the soil<br />

gas samples. The GC will be configured with an isothermal oven and a PID. The GC computer will be<br />

programmed to recognize and quantify the project-specific chemicals of concern (COC) as defined in the<br />

project-specific addenda. In addition, the pattern generated by the government-supplied fuel sample will<br />

be qualitatively identified if benzene, toluene, ethylbenzene, and xylenes are the project specific COCs.<br />

Kirtland AFB<br />

SOPs for Field Investigations B-61 April 2004

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