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GROUNDWATER SAMPLING PROCEDURES <br /> moment 1 nin <br /> All water samples are placed in precleaned laboratory-supplied bottles. Sample bottles <br /> and caps remain scaled until actual usage at the site. All equipment which comes in <br /> contact with the well or groundwater <br /> izetdhor d gt lI�Iwater before use atwith a tthe site.phosphate <br /> "I�1}1S <br /> (TSP) solution and rinsed with deton <br /> cleaning procedure is followed between each well sampled. Wells are sampled in <br /> approximate order of increasing contamination. If a teflon cord is used, the cord is <br /> cleaned. If a nylon or cotton card is used, a n w cord is useanalyzed periin each ll All <br /> odically <br /> equipment blanks are collected prior to sampling. The blanks are <br /> to ensure proper cleaning. <br /> W Pr Level Meamm—m—e—n-11 <br /> Depth to groundwater is measured in each well using a scaled sampling tape or scaled <br /> or sampling. if the well is known or suspected of <br /> electric sounder prior to purgingI interface probe is <br /> containing petroleum <br /> measure the hydrocarbon ickness and groundwater level. Measurements are collected <br /> and recorded to the nearest 0.01 foot. <br /> 1 Sailer hen Ch k <br /> ar <br /> ic <br /> If no measurable free-phase petroleum f sheen. Any observearbons are tdcfi m, as well as odorand <br /> ailer <br /> is used to determine the presence <br /> color of the water is recorded. <br /> Gro dw t r li <br /> prior to groundwater sampling, each well is purged of "standing" groundwater. Either <br /> a bailer, hand pump, or submersible pump is used to purge the well. The amount of <br /> purging is dependent on the well yield. in a high yield formation, samples will be <br /> collected when normal field measurement, including temperature, pH, and specific <br /> conductance stabilize. provided a minimum of three well-casing volumes of water have <br /> been removed. Field measurements will be taken after purging each well volume. In <br /> low yield formations, the well is purged such that the "standing" water is removed and <br /> EXCELTECH,INC. <br /> Groundwater Sampling protocol <br /> Latest Revision: March 28, 1990 <br />