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• conductivity, etc have stabilized) once at the surface, remove the bailer from <br />' the cable Carefully open the GPI bailer unit <br /> S Collect and dispose of purge waters as and remove the via] Begin slowly pouring <br /> specified in the site specific project plan from the bailer, and collect the duplicate <br /> samples from the midstream sample <br /> 7.4 Sampling <br /> S Remove the cap from the sample container <br /> Sample withdrawal methods require the use of pumps, and place it on the plastic sheet or in a <br /> compressed air, bailers, and samplers Ideally, location where it won't become <br /> purging and sample withdrawal equipment should be contaminated See Section 7 7 for special <br /> completely inert, economical to manufacture, easily considerations on VOA samples <br />' cleaned,sterilized, reusable, able to operate at remote <br /> sites in the absence of power resources,and capable of 6 Begin slowly pouring from the bailer <br /> delivering vanable rates for sample collection <br /> 7 Filter and preserve samples as required by <br /> There are several factors to take into consideration sampling plan <br /> when choosing a sampling device Care should be <br /> taken when reviewing the advantages or disadvantages 8 Cap the sample container tightly and place <br /> of any one device It may be appropriate to use a prelabeled sample container in a carrier <br /> different device to sample than that which was used to <br /> purge The most common example of this is the use 9 Replace the well cap <br /> of a submersible pump to purge and a bailer to <br /> sample 10 Log all samples to the site logbook and on <br /> field data sheets and label all samples <br /> 7 4 1 Bailers <br /> 11 Package samples and complete necessary <br /> 10 <br /> The positive-displacement volatile sampling bailer is paperwork <br /> perhaps the most appropriate for collection of water <br /> samples for volatile analysis Other bailer types 12 Transport sample to decontamination zone <br /> (messenger, bottom fill, etc ) are less desirable, but for preparation for transport to analytical <br />' may be mandated by cost and site conditions laboratory <br /> 74 1 1 Operation 742 Submersible Pumps <br />' 1 Surround the monitor well with clean plastic Although it is recommended that samples not be <br /> sheeting If using the GPI bailer,insert a via] collected with a submersible pump due to the reasons <br /> into the claim and assemble the unit stated in Section 4 4 2, there are some situations <br />' <br /> 2 Attach a line to a clean decontaminated where they may be used <br /> bailer 7 4 2 1 Operation <br />' 3 Lower the bailer slowly and gently into the <br /> well, taking care not to shake the casing I Allow the monitor well to recharge after <br /> sides or to splash the bailer into the water purging, keeping the pump ,lust above <br /> Stop lowering at a point adjacent to the screened section <br />' screen <br /> 2 Attach gate valve to hose (if not already <br /> 4 Allow bailer to fill and then slowly and fitted), and reduce flow of water to a <br />' gently retrieve the bailer from the well manageable sampling rate <br /> avoiding contact with the casing, so as not to <br /> knock flakes of rust or other foreign 3 Assemble the appropriate bottles <br /> materials into the bailer If using the GPI <br />' bailer for collecting volatile organic samples, 4 If no gate valve is available, run the water <br /> 0 9 <br />