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"c' w "' ! —s. yT' .i Vff+"f f �S- _ ✓fir -d aP, 3'i <br /> .V'' � 'f` 7 � wf � �• it <br /> r <br /> Equipment Cleaning and Decontamination <br /> All water samPics are placed to precleaned laboratory-supplied bottles. Sample bottles <br /> and caps remain sealed until actual usage hlclea eld with altrisod uent 'm phosphate <br /> ch comes in <br /> contact with the well or groundwater thoroughly <br /> (TSP} solution and rinsed with deionized ohtlwlel sampled.water Wellsare sampled at the site. <br /> '17his <br /> cleaning procedure is followed between ea <br /> approximate order of increasing contamination• nif acte doiscusedord tin eachtwell�r All <br /> cleaned. If a nylon or cotton cord Is used, .rhe blanks are analyzed periodically <br /> equipment blanks are collected prior to sampling• <br /> to ensure proper cleaning procedures are used. <br /> Water Level Measurements <br /> ell using roundwacer is measured in each wg a sealed sampling tape or scaled <br /> Depth to $ lin If the well is known or suspected of <br /> or sampling.electric sounder prior to purging p g' o tical interface probe is used to <br /> containing free-phase petroleum hydrocarbons, an P <br /> measure the hydrocarbon thickness and groundwater level. <br /> Week's totaltdepth wcollected <br /> and recorded to the nearest 0.01 foot. Each <br /> measured; this will allow a relative,judgement of well siltation to be made and need for <br /> redevelopment. <br /> Bailer Sheen Check <br /> troleum h drocarbons are detected, a clear acrylic bailer <br /> If no measurable free-phase pe Y <br /> is used to deterrei;le the presence of a sheen. Any observed film as well as odor an <br /> color of the water is recorded. <br /> Groundwater Sampling <br /> lire each well is purged of "standing" groundwater. Either <br /> Prior to groundwater samp g, a the well. The amount of <br /> a bailer, hand pump, or submersible pump 15 used to purge <br /> formation, samples will be <br /> purging is dependent on the well yield. In a high y temperature pH, and specific <br /> collected when normal field measurement, including ell ase g volumes of water have <br /> conductance stabilize, provided a minimum of three purging each well volume. <br /> been removed. Field measurements will be taken H tend specific conductance)h well <br /> are <br /> Physical parameter measurements (temperature, opcess and are used as indicators for <br /> closely monitored throughout the well purging Pr <br /> RESNA INDUSTRIES, <br /> Groundwater Sampling <br /> Latest Revision: October 23, 1991 <br /> s.�..rwi�nnimr� <br />