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4 Sampling bailers are to be composed of polyethylene (when dedicated to the well),Teflon <br /> or stainless steel Other matenals, such as acrylic, may contain phthalate esters which <br /> can interfere with gas chromatography(GO 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 animal(to prevent volatiles from being stepped from the samples). <br /> Sample bottles are filled by slowly nuuung 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 /> for used and broken vials and bottles and the sample filling procedure is repeated with <br /> another vial <br /> 6 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 /> 1 Trip Blank-Used for purgable organic compounds only,QC samples shall be collected in 40 <br /> rrulbliter (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 nQi 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 /> equipment. These QC samples will only be taken when a dedicated bailer is not used for <br /> sampling <br /> s 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 G e later date) from the same well <br /> The number and types of QC samples shall be determined by HETI on a site-specific basis. <br /> I <br /> I , E <br /> 8 ' <br /> '1I1[1 A I �� �I�� �� �i !l, II q I I ��, I �' I <br /> �f i 'i V!' �i I I I �� l ` I , I I <br />