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r • Drilling fluids such as mud or water, if used during the drilling and well installation process, are removed during the well development procedure It is recommended that a minimum of 1 5 times the volume of added fluid be removed from the well during development Drilling muds are initially flushed from the drilling casing during the well installation procedure with water added during the flushing process If the quantity of added fluid is not known or could not be reasonably estimated, removal of a minimum of 10 well volumes of water is recommended during the development procedure QUALITY ASSURANCE PLAN This section describes the field and analytical procedures to be followed by ENSR throughout ' the investigation General Sample Collection and Handlina Procedures IProper 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 • Water Sample Collection for Volatile Ornanic Analyses For volatile organic analyses (VOA), the water sample is decanted into each VOA vial in such a manner that there is no meniscus at the top of the vial A cap with a Teflon® septum 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 the Soil and Water Sample Labeling and Preservation section Soil and Water Sample Labeling and Preservation Label information includes a unique sample identification number, fob identification number, date, and time After labeling, water samples are placed in a Ziploco type bag and placed in an ' ice chest cooled to approximately 40 Celsius The samples are transported to the applicable laboratory as soon as reasonably possible Chemical preservation is controlled by the required analysis and is noted on the chain of custody form Sample Identification and Chain of Custody Procedures tSample 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