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KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

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APPENDIX B<br />

SOP B4.4<br />

Field Filtration<br />

The rationale for collecting the filtered samples will be clearly defined in the project-specific addenda.<br />

Filter apparatus must be made of polyethylene, polypropylene, or borosilicate glass. The filter used will<br />

be a cellulose-based membrane filter of 0.45-micron nominal pore size. The sample must be filtered<br />

immediately after collection to minimize changes in the concentration of the substance of interest.<br />

Samples are only passed through the filtration apparatus once. Samples are then preserved immediately<br />

as required. All paperwork accompanying the samples to the laboratory should clearly state that the<br />

samples have been field-filtered, in order to avoid second filtration at the laboratory. Field filtering of<br />

water samples should be conducted as follows:<br />

The filter apparatus will be decontaminated and clean.<br />

Pour the sample into the filter apparatus and filter sample through a cellulose-based<br />

membrane filter of 0.45-micron nominal size. Samples are only passed through the filter<br />

once.<br />

Preserve sample immediately as required.<br />

Place analytical samples in cooler and chill to 4°C. Samples will be shipped to the<br />

appropriate laboratory within 24 hours.<br />

Fill out field log book, sample log sheet, labels, custody seals, and C-O-C forms. Example<br />

copies of these forms are included in the QAPP (Appendix C of the BWP).<br />

Kirtland AFB<br />

SOPs for Field Investigations B-123 April 2004

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