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' QUALITY ASSURANCE PLAN <br /> This section describes the field and analytical procedures to be followed by ENSR throughout <br />' the investigation <br />' General Sample Collection and Handling Procedures <br /> Proper collection and handling are essential to ensure the quality of a sample Each sample is <br /> collected in a suitable container, preserved correctly for the intended analysis, and stored prior <br /> to analysis for no longer than the maximum allowable holding time <br /> Water Sample Collection for Volatile Organic Analyses <br />' For volatile organic analyses (VOA), the water sample is decanted into each VOA vial in such a <br /> manner that there is no meniscus at the top of the vial A cap with a Teflon[Iseptum is quickly <br /> secured to the top of the vial The vial is inverted and gently tapped to see if air bubbles are <br /> present If none are present, the vial is labeled and refrigerated according to the Soil and Water <br /> Sample Labeling and Preservation section <br /> MSoil and Water Sample Labeling and Preservation <br />' Label information includes a unique sample identification number, job identification number, <br /> date, and time After labeling, water samples are placed in a Ziploc®type bag and placed in an <br /> ice chest cooled to approximately 4° Celsius Upon arriving at ENSR's office, the samples are <br />' transferred to a locked refrigerator cooled to approximately 4° Celsius Chemical preservation is <br /> controlled by the required analysis and is noted on the chain of custody form <br />' Sample Identification and Cham of Custody Procedures <br />' Sample identification and chain of custody procedures document sample possession from the <br /> time of collection to ultimate disposal Each sample container submitted for analysis has a label <br /> affixed to identify the job number, sampler, date and time of sample collection, and a sample <br />' number unique to that sample This information, in addition to a description of the sample, field <br /> measurements made, sampling methodology, names of on site personnel, and any other <br /> pertinent field observations, is recorded in the field records A California-certified laboratory <br /> analyzes samples <br /> A chain of custody form is used to record possession of the sample from time of collection to its <br /> arrival at the laboratory When the samples are shipped, the person in custody of them <br /> • relinquishes the samples by signing the chain of custody form and noting the time The sample <br />