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Water Sample Labeling and Preservation Label information includes a unique sample identification number, job identification number, date, and time After labeling, water samples are placed in a Ziploc®type bag and placed in an ice chest cooled to approximately 4° Celsius Upon arriving at ENSR's office, the samples are transferred to a locked refrigerator cooled to approximately 4* Celsius Chemical preservation is controlled by the required analysis and is noted on the chain of custody form Sample Identification and Cham of Custody Procedures Sample identification and chain of custody procedures document sample possession from the time of collection to ultimate disposal Each sample container submitted for analysis has a label affixed to identify the job number, sampler, date and time of sample collection, and a I sample number unique to that sample This information, in addition to a description of the sample, field measurements made, sampling methodology, names of on site personnel, and any other pertinent field observations, is recorded in the field records A California-certified laboratory analyzes samples ' . A chain of custody form is used to record possession of the sample from time of collection to its arrival at the laboratory When the samples are shipped, the person in custody of them relinquishes the samples by signing the chain of custody form and noting the time The sample control officer at the laboratory verifies sample integrity and confirms that the samples are collected in the proper containers, preserved correctly, and contain adequate volumes for analysis If these conditions are met, each sample is assigned a unique log number for identification throughout analysis and reporting The log number is recorded on the chain of custody form and in the legally required logbook maintained by the laboratory in the laboratory The sample description, date received, client's name, and other relevant information is also recorded I