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FIELD PROCEDURES <br /> Measurement of the Dept to Groundwater in Mnnitorjn Wells <br /> The depth of the groundwater surface in a monitoring well was measured from the top of <br /> the well casing to the nearest 0.01 foot with a Solinst water-level indicator. <br /> Subjective Analysis of Monitoring We11.5 <br /> Groundwater samples are collected for subjective analysis from the air-fluid interface <br /> in a monitoring well by lowering approximately half the length of a clean bailer <br /> throu&h the interface. The baer is retrieved <br /> uubjective ev.dencethe water samletof hydrocarbon <br /> examined for floating product, <br /> contamination. <br /> Pur�in and Samar,ilin�Monitarin Wells <br /> Before sample collection,a minimum of 3 casing volumes of ground water is purged from <br /> each monitoring well using <br /> iagd conductivity measurements an <br /> field be cinstrumentient to s. After the <br /> stable temperature,p <br /> well is allowed to recover to near static levels,a groundwater sample is collected y <br /> lowerin&a clean bailer past the air-water interface. The bailer is retrievedand the <br /> y transferred to laboratory-cleaned,40-milliliter glass vials. The <br /> sample is slow] <br /> vials are filled so as to prevent headspace. Labels which show the site <br /> identification number,the date and time of safixed mTphle collection, and the sastored in mple <br /> identification number are <br /> geolooist initiates a Chain Custle,are ody Reclord listing <br /> an <br /> ice chest with f $ <br /> each sample number, the site identification number,and the date sampled. This record <br /> will accompany the samples to the analytical laboratory- <br /> rr.en�rrr-naw.�an,w�a,R�n - <br />