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where greater accuracy is requited, Petroleum Hydrocarbons, Total Recoverable <br /> can be quantitatively determined duough the use of an inffrated <br /> spectrophotometer in conjunct n with freon extraction of the samples coDEcted <br /> during the edl baring operation. The procedure used is in accordance with EPA <br /> stoxet number 45501 with an accuracy of +1 ppm. <br /> Analysis of the sail samples for aromatic gasoline components (benzene, toluene, <br /> and xylene) can also be performed using a gas chromatograph to an accuracy of <br /> +1 ppb. <br /> DHK: 01.02 <br /> 5 <br />