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Soil Sample Labeling and Preservation Label information includes a unique sample identification number,fob identification number, date, and time After labeling all soil samples are placed in a Ziploco type bag and placed in an ice chest ' cooled to approximately 4° Celsius Upon arriving at Delta'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 t Upon recovery, the sample container is sealed to minimize the potential of volatilization and ' cross-contammation prior to chemical analysis Soil sampling tubes are typically closed at each end with a Teflon® sheet and plastic caps The sample is then placed in a Ziploce type bag and sealed The sample is labeled and refrigerated at approximately V Celsius for delivery, under t strict chain-of-custody,to the analytical laboratory Groundwater Sampling ' Upon reaching the water bearing zone, a PVC casing screened with 0 020 slots was temporarily inserted into the boring for the collection of a water sample A liquid sample was collected from ' each boring with a clean disposable bailer and transferred into a laboratory supplied sampling container Each sample was appropriately labeled and stored on ice from the time of collection through the time of delivery to the laboratory Groundwater samples were transported to the ' laboratory and analyzed within the EPA-specified holding times for the requested analyses Liquid-Phase Petroleum Hydrocarbons If liquid-phase petroleum hydrocarbons are present in a boring, the thickness of the petroleum layer was measured by collecting a sample in a transparent disposable bailer with a check valve at ' the bottom, or by measurement using appropriate fluid-level sounding equipment 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 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 on the borehole log or in the field records The samples are analyzed by a California-certified laboratory 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 F SPrqecis170137\MasterSWPT1wure110OTicld Methods doc 2