QTP4B051-6 governs preparation and preservation of samples for shipment and selection of appropriate occupational and environmental exposure limits.
View QTP4B051-6 on armypubs.army.mil
It contains task steps for sample labeling, cooling, packing, documentation, shipping, and chain of custody. It also covers identifying, reviewing, comparing, and selecting occupational and environmental exposure limits, including values for methylene chloride/dichloromethane.
The USAFSAM laboratory has a sampling guide, the USAFSAM Laboratory Sampling Guide (Air Force) that MUST be used when preparing to collect a sample, regardless of the type of sample. (paragraph 1)
Complete sample request forms legibly in permanent ink. (paragraph 8)
Keep samples as cool as possible to minimize the potential for volatilization or biodegradation between the time of collection and the time of final analysis. Pack samples in cubed or crushed ice or commercial ice substitutes before shipment. (paragraph 5)
Avoid the use of dry ice because it will freeze the samples (in the case of water) or dissolved gases may be lost, and dry ice may break the containers. (paragraph 5)
Always add enough cushioning around and between the samples to prevent breakage. (paragraph 6)