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4 <br /> 4. Sampling bailers are to be composed of polyethylene (when dedicated to the well),Teflon <br /> or stainless steel. Other materials, such as acrylic, may contain phthalate esters which <br /> can interfere with gas chromatography(GC)analyses. Well purging may be performed <br /> with PVC bailers. <br /> ~ 5. Volatile organic groundwater samples are collected so that air passage through the sample <br /> does not occur or is minimal(to prevent volatiles from being stripped from the samples). <br /> Sample bottles are filled by slowly running the sample down the side of the bottle until <br /> there is a positive convex meniscus over the neck of the bottle. The Teflon side of the <br /> septum(in cap)is positioned against the meniscus and the cap is screwed on tightly. The <br /> sample is then inverted and lightly tapped while the sampler inspects the contents of the <br /> bottle for an air bubble. The absence of an air bubble indicates a successful seal. If a bubble <br /> is evident,the cap is removed and more water is added to the sample. The inspection <br /> procedure is repeated and if bubbles persist,the vial is discarded in a container designated <br /> 60 for used and broken vials and bottles and the sample filling procedure is repeated with <br /> another vial. <br /> 6.06. Extra vials shall be available for use in the event of dropped bottles and/or caps. Any <br /> bottle which has come in contact with the ground shall be considered contaminated and <br /> shall not be used. When replacing septa,or if septa become inverted,care shall be taken to <br /> assure that the Teflon seal faces the interior of the bottle. <br /> 7. All preservatives shall be provided by the contract analytical laboratory. <br /> Laboratory and field handling procedures of samples may be monitored by including QC <br /> samples for analysis with sample lots from a project site. QC samples may include any <br /> combination of the following: <br /> low I. Trip Blank-Used for purgable organic compounds only;QC samples shall be collected in 40 <br /> milliliter (ml) sample vials filled in the analytical laboratory with organic free water. <br /> Trip blanks should be sent to the project site,and travel with the samples from the project <br /> �.• site. Trip blanks are not opened,and are returned from the project site with the samples <br /> from the project site for analysis. <br /> 2 Field Blank -Prepared in the field using steam-distilled water. Field blank QC samples <br /> shall accompany project site samples to the laboratory and shall be analyzed for the same <br /> chemical parameters as those samples taken from the project site. <br /> 3. Equipment Blank-Equipment Blank QC samples shall be prepared in the field using field <br /> equipment rinsate between two different wells after the equipment has been washed and <br /> rinsed. The equipment blank will consist of deionized water retained in the sampling <br /> v equipment. These QC samples will only be taken when a dedicated bailer is not used for <br /> sampling. <br /> L 4. Duplicates-Duplicate QC samples shall be collected "second samples" from a selected <br /> well and project site. Duplicates shall be collected as either split samples or second-run <br /> samples (i.e. later date) from the same well. <br /> `r The number and types of QC samples shall be determined by HETI on a site-specific basis. <br /> V <br /> 1nM Q <br /> v <br /> V <br />