KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

APPENDIX B
QA/QC Sample Minimum Frequency Acceptable Range
Standard 1 per 10 samples The standard run before the first sample each day must
be within 25 percent of the calibrated concentration
and within 10 percent of the calibrated retention time.
Due to degradation of the standards during the day,
subsequent standards run that day are used to confirm
retention time only. Retention time must stay within
10 percent of the calibration.
Sample Duplicate 1 per 20 samples Results must be within 50 percent of each other for the
compound detected at the highest concentration.
No-Injection
Blank
once per day
Results must be less than 10 percent of the
concentration of the standard.
Syringe Blank once per day Results must be less than 10 percent of the
concentration of the standard.
Probe Blank 1 per 10 samples Results must be less than 10 percent of the
concentration of the standard or less than 10 percent of
the previous sample, which ever is greater.
Data Reporting
Following the completion of the soil gas survey, a letter report is prepared. It contains site maps showing
the soil gas sampling locations. Maps are also prepared that contain a posting of the soil gas results or, if
contaminants are detected at several adjacent samples, contours of the results. The report will contain a
table of the soil gas results and a description of the sampling and analysis procedures.
At locations where contaminants are detected in the soil gas, those same contaminants are expected to be
present in the soil or groundwater. In areas where the concentration gradients are steep, contaminants are
expected to be present in the soil and possibly the groundwater. Steep gradients are loosely defined as a
change in concentration by a factor of 100 over a horizontal distance of 50 ft. In areas where
concentration gradients are gentle, widespread soil contamination or groundwater contamination is
expected. Gentle concentration gradients are loosely defined as a change in concentration by a factor of
5 or less over a horizontal distance of 50 ft.
The results of the soil gas survey are used to qualitatively describe the areal extent of volatile
contamination. They are also used to determine the locations of subsequent soil borings and monitoring
wells. For overall characterization of the site, soil gas results are secondary to the soil and groundwater
results. In addition, soil gas results cannot be used to describe the extent of semivolatile or heavy metals
contamination.
Kirtland AFB
SOPs for Field Investigations B-106 April 2004