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KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

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APPENDIX B<br />

the identification or quantification is not correct, manual identification and quantitation can be done.<br />

Manual identification consists of identifying the peak based on retention time, peak shape, and<br />

interfering peaks. Manual quantitation consists of determining concentration by measurement of peak<br />

height or area. In addition to identifying the compounds present in the standard, a qualitative<br />

determination based on retention times should be made for any unknown peaks recorded on the<br />

chromatogram. These unknowns should be reported with retention times and peak area. Multiple peak<br />

responses, which may be indicative of the presence of fuel products, should also be noted.<br />

Results are reported in concentrations of contaminants in the soil gas. Units must be specified in<br />

absolute units such as mass per liter of soil gas or vapor volume per liter of soil gas. Generalized units<br />

such as parts per million or parts per billion are not to be used unless they are also specified in absolute<br />

units.<br />

Onsite Laboratory Analysis<br />

With onsite laboratory analysis, the soil gas samples are collected, packaged for shipment, and sent to the<br />

onsite laboratory for analysis. Since gas samples degrade rapidly, sample analysis should be the same<br />

day. Samples should be stored on ice in a dark container.<br />

All collection, calibration, and analysis procedures listed for field analysis with a portable GC apply,<br />

except a bench or laboratory GC may be substituted. Onsite laboratory analysis provides higher level<br />

quality analytical results if the proper QA/QC is performed.<br />

Quality Assurance/Quality Control (QA/QC)<br />

QA/QC samples will be run throughout the field operation to ensure the quality and reproducibility of the<br />

data. A minimum of three QA/QC samples will be run every twenty samples. Additional QA/QC<br />

samples will be run if the field chemist determines that they are required.<br />

For sample collection, QA/QC should ensure maximum uniformity in the collection procedures, the<br />

effective exclusion of ambient air, the collection of sample duplicates and method blanks and equipment<br />

decontamination. All pertinent information about the sampling equipment, process, and especially any<br />

site observations should be recorded in the soil gas log book.<br />

Standards will be run at least every 10 unique samples to confirm the calibration of the GC. Sample<br />

duplicates (2 samples from the same point) will be run every 20 samples to check the reproducibility of<br />

the sampling and analysis procedures.<br />

No-injection, ambient air, and probe blanks will be run to check for carry-over (cross-contamination)<br />

between samples. No-injection blanks consist of running an analysis but not injecting a sample into the<br />

GC. They are run to determine if contamination is present in the GC. They will be run at least once per<br />

day. Syringe blanks consist of injecting hydrocarbon-free air into the GC. They will be run at least once<br />

per day. Probe blanks consist of pumping ambient air through the sampling probe, collecting a sample,<br />

and analyzing the sample. They are used to determine the concentrations of contaminants in the ambient<br />

air. Probe blanks will be run at least once every 10 unique samples.<br />

The following are the data quality objectives for the soil gas results.<br />

Kirtland AFB<br />

SOPs for Field Investigations B-105 April 2004

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