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After a soil sample has been collected, soil from the remaining tubing is placed inside a sealed plastic bag and <br /> set aside to allow hydrocarbons to volatilize from the soil After ten to fifteen minutes, a portable <br /> photoionization detector measures volatile hydrocarbon vapor concentrations in the bag's headspace,extracting <br /> the vapor through a slit in the plastic bag The measurements are used along with the field observations, odors, <br /> stratigraphy and ground water depth to select soil samples for analysis <br /> Grab Ground Water Sampling <br /> Ground water samples are collected from the open borehole using bailers, advancing disposable Tygon tubing <br /> into the borehole and extracting ground water using a diaphragm pump, or using a hydro-punch style sampler <br /> with a bailer or tubing The ground water samples are decanted into the appropriate containers supplied by <br /> the analytic laboratory Samples are labeled, placed in protective foam sleeves, stored on crushed ice at or <br /> below 4"C, and transported under chain-of-custody to the laboratory <br /> Duplicates and Blanks <br /> Blind duplicate water samples are usually collected only for monitoring well sampling programs, at a rate of <br /> one blind sample for every 10 wells sampled Laboratory-supplied trip blanks accompany samples collected <br /> for all sampling programs to check for cross-contamination caused by sample handling and transport These <br /> tnp blanks are analyzed if the internal laboratory quality assurance/quality control (QA/QC) blanks contain <br /> the suspected field contaminants An equipment blank may also be analyzed if non-dedicated sampling <br /> equipment is used <br /> Grouting <br /> If the borings are not completed as wells,the borings are filled to the ground surface with cement grout poured <br /> or pumped through a trenue pipe <br /> G%0-MGMTITemplates-Boilers\CPT SOP wpd <br />