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Elia r u!?. Zh W'-1 —:._ :•.'r� ���mf� <br /> i <br /> S. <br /> i <br /> #� GROUNDWATER SAMPLING PROCEDURES <br /> j <br /> k� Equi_ mens Cleani� <br /> AH water samples are placed in precleaned laboratory-supplied bottles. Sample bottles <br /> and caps remain sealt.d until ?ctual usage at the site. All equipment which comes in <br /> contact with the well or groundwater is thoroughly cleaned with a trisodium phosphate <br /> (TSP) solution and rinsed with deionized or distilled w,,.zr before use at the site. This <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 /> lka cleaned. If a nylon or cotton cord is used, a new cord is used in each well All <br /> 'i equipment blanks are collectedrior to sampling. The blanks are analyzed P P g• y periodically <br /> r� <br /> to ensure proper cleaning. <br /> Water Lev p <br /> rmn <br /> Depth to groundwater is measured in each well using a sealed sampling tape or scaled <br /> e.ectric sounder prior to ur in f <br /> p or sampling.m lin <br /> g g I. the <br /> . well i <br /> P g s know <br /> containing free-phase nor suspected of <br /> g p petroleum hydrocarbons, an optical interface probe is used to <br /> K measure the hydrocarbon thickness and groundwater level. Measurements are collected <br /> and recorded to the nearest 0.01 foot. <br /> � _eller Sh�� <br /> If no measurable free-phase petroleum hydrocarbons are detected, a clearacrylic bailer <br /> is used to determine the presence of a sheen. Any observed film as well as odor and <br /> color of the water is recorded. <br /> .- <br /> tra r �� �undwater Sa�nnl,..,E,ng <br /> Prior to groundwater sampling, each well is purged of "standing" groundwater. Either <br /> D fes# a bailer, hand pump, or submersible pump is used to purge the well. The amount of <br /> f; purging is dependent on the well yield. In a high yield formation, samples will be <br /> a 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. Inlow yield formations, the well is purged such that the "standing" water is removed and <br /> EXCELTECH,INC. <br /> Groundwater Sampling Protocol <br /> a Latest Revision: March 28, 1990 <br /> z - <br />