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1 Y ! <br /> 1 ! <br /> Assurance Plan Water generated during the monitoring event is disposed of according to the <br /> r r�accepted regulatory method pertaining to the site <br /> SOIL VAPOR SAMPLING <br /> Soil Vapor- Extraction wells are purged using a�vacuum pump until a minimum of three-well <br /> volumes of air has been removed "Purge"volumes are calculated based on the volume of the <br /> tubing making up the sample line , If three well volumes cannot be removed or if the well <br /> screen is submerged samples are not collected The air sample.is collected in as Summa <br /> Canister, labeled and handfed according to the Quality Assurance Plan <br /> LOCATING UNDERGROUND UTILTITIES ' <br /> Prior to commencement of any work conducted below surface grade, the location of the <br /> borings is marked with white paint as required by law An underground locating service <br /> such as Underground Service Alert (USA) is contacted The locating company contacts the <br /> owners of the various utilities-,in the -vicinity-of the site to ,mark the _locations of their <br /> underground utilities <br /> ' <br /> QUALITY ASSURANCE PLAN <br /> This section describes the field and analytical procedures to be followed by ENSR <br /> throughout the investigation <br /> — General-Sample Collection-an`d Handhng=Procedures' <br /> - =- 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 <br /> - --� <br /> - --prior to-analysis-for no1onger than the maximum allowable holding-time-­­ <br /> Water <br /> olding•timew-­ -Water Sample Collection for Volatile Organic Analyses ' <br /> For volatile organic analyses (VOA), the,water sample is decanted into each VOA vial in <br /> such a manner that there is no meniscus at the top of the vial septum is❑A cap with a <br /> Teflon quickly secured to the top of the vial The vial is inverted and gently tapped to see if <br /> air'bubbles are present If none are present, the vial is labeled and refrigerated according to <br /> the Soil and Water Sample Labeling and Preservation section <br /> r� <br />