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KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

KIRTLAND AIR FORCE BASE ALBUQUERQUE, NEW MEXICO ...

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APPENDIX B<br />

SOP B2.4<br />

Test Pit Sampling<br />

The following procedure will be used for test pit excavation and sampling:<br />

Wear appropriate PPE as required in the BWHSP (Appendix F of the BWP) and the SSHP.<br />

In addition, samplers will don new sampling gloves at each location.<br />

Using a backhoe or other appropriate heavy equipment, excavate the trench to the actual size<br />

and depth as outlined in the project specific addenda. Place excavated materials on plastic<br />

sheeting.<br />

A sample from near the surface may be taken by advancing a 3½-inch decontaminated<br />

stainless steel hand auger (or hand scoop) from 0 to 6 inches. If the depth of the test pit<br />

precludes the use of a hand auger to obtain a sample, then the bucket of the backhoe will be<br />

used. The sample will be obtained from the base of the excavation at the required depth with<br />

the bucket and then using a hand auger or hand scoop a sample will be extracted from the<br />

middle of the bucket. Personnel should not enter an excavation if it is over 4 ft deep.<br />

If staining is present, the test pit should be extended out, along the proposed length of the test<br />

pit, based upon field observations and in consultation with base personnel. Notes on the<br />

depth of contamination, layers present, and any field measurements (e.g. PID readings)<br />

should be included in the field log book. If visibly contaminated soils stop, the last sample<br />

should be from ―clean‖ soil at the end of the excavation. The total of samples per test pit<br />

will be specified in site-specific addenda, but may be determined in the field based on site<br />

conditions.<br />

Sample collection for VOC and total organic carbon (TOC) analyses will be in accordance<br />

with U.S. EPA SW-846 Method 5035 and NMED requirements. Samples will be collected<br />

using EnCore ® (or similar) samplers. If conditions exist that make the use of this type of<br />

sampler impractical (collection of samples from the backhoe bucket or dry or gravelly<br />

conditions), another method may be used and should be addressed in the project-specific<br />

work plan. If another method is used, such as a discrete grab sample collected in a 4-ounce<br />

jar, the sample should be collected prior to homogenization with as little disturbance as<br />

possible.<br />

Empty contents of auger into a stainless steel pan or disposable sample tray.<br />

Fill jars with soil using stainless steel spatulas or spoons. All soil samples for chemical<br />

analyses, except VOC and TOC, must be homogenized by vigorous mixing in stainless steel<br />

pans with stainless steel spoons prior to being put into containers. VOC and TOC samples<br />

must be taken as discrete grab samples. These should be taken immediately from the hand<br />

auger, and properly packaged. All samples should be homogenized in accordance with SOP<br />

B2.5.<br />

Place analytical samples in cooler and chill to 4°C. Samples will be shipped 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-93 April 2004

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