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0 0 Subjective Analysis of Ground Water Prior to purging, a water sample is collected from the monitoring well for subjective assessment. The sample is retrieved by gently lowering a clean, disposable bailer to approximately one-half the bailer length past the air/liquid interface. The bailer is then retrieved, and the sample contained within the bailer is examined for floating LPH and the appearance of a LPH sheen. Monitoring Well Purging and Sampling Monitoring wells are purged using a pump or bailer until pH, temperature and conductivity of the purge water has stabilized and a minimum of three well volumes of water has been removed. If three well volumes can not be removed in one half an hour of time,the well is allowed to recharge to 80 percent of the original level. After recharging,a ground water sample is then removed from the well using a disposable 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 regulatory accepted method pertaining to the site. QUALITY ASSURANCE PLAN General Sample Collection and Handling Procedures Proper collection and handling are essential to ensure the quality of a sample. Each sample is collected in a suitable 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 samples used on this project can be found in this section. Water Sample Collection for Volatile Organic Analyses For volatile organic analyses(VOA),the water sample is decanted into each VOA vial in such a manner so that there is no meniscus at the top of the vial. A cap is quickly secured to the top of the vial. The vial is inverted and gently tapped to see if air bubbles are present. If none are present, the vial is labeled and refrigerated according to Soil and Water Sample Labeling and Preservation procedures. Soil and Water Sample Labeling and Preservation Label information includes a unique sample identification number,job identification number, date and time. After labeling, all soil and water samples are placed in a Ziploc type bag and placed in an ice chest cooled to approximately 4°Celsius. Upon arriving at the Delta 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. 5