ARCHIVED REPORTS_1996_2 - Laserfiche WebLink

Home Browse Search

51 Section No: 7 Page: 1 of 6 Revision No: 2.0 Date: January 15, 1994 7.1 Sample Custody It is essential to ensure sample integrity from the time of collection through analysis and final disposition. This includes the ability to trace possession and handling of the samples. This is referred to as chain -of -custody and is important in the event of litigation involving the results. Where litigation is not involved, in -of -custody procedures are useful for routine control of sample flow. A sample is considered to be under aperson's custody if it is in the individual's physical possession, in the individual's sight, secured in a per -proof manner by that individual, or is secured in an area restricted to authorized personnel. The following procedures summarize the major aspects of chain -of -custody. 7.1.1 Sample Labels Use labels to prevent sample misidentification. Gummed paper labels or tags generally are adequate. Include at least the following information: sample number, name of -3 collector, date and time of collection, and place of collection. Affix labels to sample containers before or at the time of sampling. Fill label out with waterproof ink at time of ., collection. 7.1.2 Custody Seals Use sample seals to detect unauthorized tampering with samples up to the time of analysis. Plastic seals are normally used. Attach seal in such a way that it is necessary to break the seal to open the sample container. Affix seal to container before sample leaves custody of sampling personnel. i 7.1.3 Field Log Book Record all information pertinent to a field survey or sampling in a bound log book. As a minimurn, include the following in the log book; purpose of sampling; location of sampling point; name and address of field contact; producer of material being sampled and address, if different from location; and type of sample. Because sampling situations vary widely, no general rule can be given as to the information to be entered in the log book. It is desirable to record sufficient information between the logbook and chain -of -custody so that one could reconstruct the sampling without reliance on the collector's memory. Protect the log book and keep it in a safe place. 7.1.5 Shipping Samples or Sample Delivery to Laboratory Prior to shipping samples all documentation must be ready for proper chain of custody. The information necessary for documenting chain of custody is outlined section 7.3. After filling out the proper sample documentation, the samples and documents should be placed in an ice chest with adequate protection. Normally "Blue Ice" is used for keeping samples cool. However, dry ice may be used if approved by Department of _ Transportation (DOT). If client provides direct delivery of sample to laboratory, samples should be delivered as soon as practicable. Documentation must be ready for proper chain of custody. Again, all information necessary for documenting chain of custody is outlined section 7.3. Accompany sample with chain- of -custody record and a sample analysis request sheet. Deliver sample to sample custodian.