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T" KIM I 7 ..e �}+ e <br /> CORN- <br /> 9 <br /> yy GROUNDWATER SAMPLING PROCEDURES <br /> Y� <br /> EW <br /> E. <br /> PMM CV= t� <br /> fa <br /> All water samples fire placed it precleaned laboratory-supplied bottles. Sample bottles and <br /> caps remain sealed ui.0 actual usage at the site. All equipment which comes in contact with <br /> p the well or growndwater is thoroughly cleaned with a trisodium phosphate(TSP)solution <br /> and rinsed wiui deionized or distilled water before use at the site. This cleaning procedure is <br /> followed betweeneach well sampled. Wells are sampled in approximate order of increasing <br /> contamination. If a teflon cord is used, the cord is cleaned. If a nylon or cotton cord is <br /> used,a new cord is ured in each well All equipment blanks are collected prior to sampling. <br /> The blanks are analyzed periodically to ensure proper cleaning. <br /> Water Uvel <br /> Depth to groundwater is measured in each well usirg a sealed sampling tape or scaled <br /> electric sounder prior to purging or sampling. If the well is known or suspected of <br /> containing free-phase petroleum hydrocarbons,an optical interface probe is used to measure <br /> the hydrocarbon thickness and groundwater level. Measurements ate collected and recorded <br /> " to the ntarest 0.01 foot. <br /> # Bailer Sheen <br /> If no measurable free-phase lretroleum hydrocarbons are detected, a clear acrylic bailer is <br /> used to deterst:ine the presence of a shun. Any observed filen as well as odor and color of <br /> the water is recorded. <br /> Groundwater Sampling, <br /> 1 Prior to grou.�dwater sampling, each well is purged of"standing" groundwater. Either a <br /> ` bailer,hand pump,or submersible pump is used to purge the well. The amount of purging <br /> is dependent on the well yield. In a high yield formation, samples will be collected when <br /> normal field measurement,including temloerature, pH,and specific conductance stabilize, <br /> prow, <br /> died �minimum of three well-casing volumes of water have been removed. Field <br /> measurer}ents will be taken after purging each vrell volume. In low yield formations,the <br /> well is pufged such.that the`'standing"water is reran ved and the well is allowed to recharge.- <br /> (NormaLfield mei •;cements will be periodically recorded dtuing the purging process.) In <br /> ;13 EXCELTECH,INC. <br /> E. Groundwater Sampling Protocol <br /> ti Latest Revision: March 28, 1990 <br /> E <br />