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' Assurance Plan Water generated during the monitoring event is disposed of according to the accepted regulatory method pertaining to the site SOIL VAPOR SAMPLING Sod 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 LOCATING UNDERGROUND UTILTITIES f n work conducted below surface rade the location of the Prior to commencement o any grade, borings is marked with white paint as required by law An underground locating service such as Underground Service Alert (USA) is contacted The locating company contacts the owners of the various utilities in the vicinity of the site to mark the locations of their underground utilities lie QUALITY ASSURANCE PLAN This section describes the field and analytical procedures to be followed by ENSR throughout the investigation 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 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 that there is no meniscus at the top of the vial septum is❑A cap with a Teflon 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