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� <br /> MEMO� � ��FF'¢F'r'3 c�y �r'�a;at� �j'_ r�_ i^� ��R.a2'z,��-_" ,�{�.'��?��,�� �= '� �.,� "�.aj•�':�� <br /> i A3 4.: 2 l : ,.�•��rY-`s � f fi Y°t': (r n 3 '� M' �+.yh_ 'yS <br /> s�. <br /> G i <br /> AtIAL.YTICAI, METHODOLOGY <br /> r - <br /> Total Petroleum Hydrocarbons (TP11) Extractables by GC/FID <br /> Extraction procedure: <br /> WATER - <br /> A 1 liter sample is poured into a 2 liter reparatory funnel. 3x1ES3 ml <br /> aliquots of methylene chloride (2 minute shake outs) are completed. The <br /> methylene chloride is decanted off and concentrated to a 5 ml final volume. <br /> SOIL - <br /> - 30 grams of soil is mixed with 10 grams of washed sodium sulfate. 100 mis <br /> of methylene chloride is added to the soil and placed on a mechanical <br /> shaker for 1 hour. The liquid is decanted off and the process is repeated <br /> with an additional 50 m1 of methylene chloride. The combined solvent <br /> extract is filtered through sodium sulfate and the extract is concentrated to <br /> a 5 ml final volume. <br /> GC ANALYSIS - <br /> 3 ul's of the sample extract is injected into a 'Varian 3400 GC equipped <br /> with a Flame Ionization Detector, (FID), a split,/splitless capillary injector <br /> operated in the splitless mode and a 30 meter, 0.25 mm ID, D&-5 capillary <br /> column temperature programmed from 40 to 280 deg C. The TPH fractinn is <br /> quantitated as gasoline and/or diesel fuel (and/or different petroleum <br /> hydrocarbon fuel types if requested, such as JP-4 jet fuel) based on relative <br /> retention times against a multipoint standard curve. The TPH fraction <br /> quantitation is based on chromatographic peak areas. <br /> Criso-rVL rr,PI-YiICA(I-AbOrntoaiCs,INC. <br />