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bailer The water sample is collected, labeled and handled according to the Quality Assurance Plan Water generated during the monitoring event is disposed of according to the ' accepted regulatory method pertaining to the site ' 5 SOIL VAPOR SAMPLING Soil Vapor Extraction wells are purged using a vacuum pump until a minimum of three well volumes of air has been removed Purge volumes are calculated based on the volume of the tubing making up the sample line If three well volumes cannot be removed or if the well ' screen is submerged samples are not collected The air sample is collected in a Summa Canister, labeled and handled according to the Quality Assurance Plan 6 QUALITY ASSURANCE PLAN ' This section describes the field and analytical procedures to be followed by ENSR throughout the investigation 6 1 General Sample Collection and Handling Procedures Proper collection and handling are essential to ensure the quality of a sample Each sample will be collected in the appropriate container, preserved correctly for the intended analysis and stored, prior to analysis, for no longer than the maximum allowable holding time Details on the procedures for collection and handling of soil samples from this project can be ' found in previous sections 6 2 Sample Identification and Chain-of-Custody Procedures Sample identification and chain-of-custody procedures ensure sample integrity and ' document sample possession from the time of collection to its ultimate disposal Each sample container submitted for analysis will have a label affixed to identify the job number, sampler, date and time of sample collection and a sample number unique to that sample During soil sampling, this information, in addition to a description of the sample, field 1 measurements made, sampling methodology, names of on-site personnel and any other pertinent field observations will be recorded on the borehole log or in the field records i 1 1