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Geological Technics Inc Page 4 <br /> George's Service <br /> Additional Site Characterization Work Plan <br /> Project No 2812 <br /> January 29,1996 <br />' 2.3 Groundwater Sampling Procedure <br /> The groundwater in the new wells will be sampled no sooner than 48 hours after <br />' well development The following is a procedure for the sampling of groundwater <br /> from the well. <br />' Before sampling is attempted the well will be sounded for depth to water and then a <br /> clear disposable bailer will be used to determine if floating product is present The <br /> well will be purged of at least 3 well volumes of stagnant water using either a <br /> submersible pump or a stainless steel bailer Purging will continue until the <br /> temperature, conductivity, and pH of the groundwater has stabilized (<10% <br /> variation between three readings) indicating that formation water representative of <br /> aquifer conditions is entering the well These water quality parameters are <br /> measured at intervals of each well volume purged <br /> A stainless steel or disposable plastic bailer will be used to collect each sample Care <br /> will be taken to minimize sample agitation from the initial filling of the bailer to the <br /> transfer of the sample to the VOA vial and glass amber liter bottles Once the <br /> sample container is filled and capped, the bottle will be inverted, tapped, and <br /> checked for head space bubbles The sample container is identified and labeled with <br /> a unique designation, inserted into foam holders and placed in an ice chest cooled to <br /> 4°C for transport to the laboratory ' <br />' All non disposable sampling equipment is decontaminated using a steam cleaner <br /> before and between uses The effectiveness of the decontamination procedure is <br /> ensured by using the following quality control measures <br /> a Disposable gloves will be used b the technician to collect all samples and will be <br /> Y P <br /> changed with each sampling event <br /> a A bailer blank for each well will be collected prior to sam lin b fillip the <br /> P F g Y g <br /> decontaminated stainless steel bailer with water (provided by the laboratory) and <br /> then filling a VOA vial (provided by the laboratory) using the same procedures <br /> for actual sample collection <br />' Bailer blanks for each sample, along with a field blank (prepared from water <br /> provided by the laboratory poured into a VOA vial on site), will accompany the <br /> samples to the laboratory and serve as checks against cross contamination <br />