OAR 340-122-0345
Cleanup Rules for Leaking Petroleum UST Systems: Sample Collection Methods
(1)
The following information must be kept during the sampling events:(a)
A sketch of the site must be made which clearly shows all of the sample locations and identifies each location with a unique sample identification code;(b)
Each soil and water sample must be clearly labeled with its sample identification code. A written record must be maintained which includes, but is not limited to: the date, time and location of the sample collection; the name of the person collecting the sample; how the sample was collected; and any unusual or unexpected problems encountered during the sample collection which may have affected the sample integrity;(c)
Formal chain-of-custody records must be maintained for each sample.(2)
If soil samples cannot be safely collected from the excavation, a backhoe may be used to remove a bucket of native soil from each of the sample areas. The soil is to be brought rapidly to the surface where samples are to be immediately taken from the soil in the bucket.(3)
The following procedures must be used for the collection of soil samples from open pits or trenches:(a)
Just prior to collecting each soil sample, approximately three inches of soil must be rapidly scraped away from the surface of the sample location;(b)
To minimize the loss of volatile materials, it is recommended that samples be taken using a driven-tube type sampler. A clean brass or stainless steel tube of at least one inch in diameter and three inches in length may be used for this purpose. The tube should be driven into the soil with a suitable instrument such as a wooden mallet or hammer;(c)
The ends of the sample-filled tube must be immediately covered with clean aluminum foil. The foil must be held in place by plastic end caps which are then sealed onto the tube with a suitable tape;(d)
Alternatively, samples may be taken with a minimum amount of disturbance and packed immediately in a clean wide-mouth glass jar leaving as little headspace as possible. The jar must then be immediately sealed with a teflon-lined screw cap;(e)
After the samples are properly sealed, they are to be immediately placed on ice and maintained at a temperature of no greater than 4° C (39° F) until being prepared for analysis by the laboratory. All samples must be analyzed within 14 days of collection.(4)
The following procedures must be used for the collection of water samples from the tank pit:(a)
After the water has been purged from the pit in accordance with OAR 340-122-0340 (Cleanup Rules for Leaking Petroleum UST Systems: Sample Number and Location)(4)(a), samples shall be collected as soon as sufficient water has returned to the pit to allow representative sampling;(b)
Samples are to be taken with a device designed to reduce the loss of volatile components. A bailer with a sampling port is suitable for this purpose;(c)
The water is to be transferred into two identical glass vials with as little agitation as possible and immediately sealed with a teflon-lined caps. The vials must be filled completely so that no air bubbles remain trapped inside;(d)
After the samples are properly sealed, they are to be immediately placed on ice and maintained at a temperature of no greater than 4° C (39° F) until being prepared for analysis by the laboratory. All samples must be analyzed within 14 days of collection.(5)
The Department may approve alternative sampling methods which have been clearly shown to be at least as effective with respect to minimizing the loss of volatile materials during sampling and storage as the methods listed in sections (1)–(4) of this rule.
Source:
Rule 340-122-0345 — Cleanup Rules for Leaking Petroleum UST Systems: Sample Collection Methods, https://secure.sos.state.or.us/oard/view.action?ruleNumber=340-122-0345.