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STANDARD OPERATING PROCEDURE SOP Number: 2.1 <br /> Date: November 9,2009 <br /> STANDARD FIELD SCREENING PROCEDURES Revision Number: 1.1 <br /> Page: 2 of 2 <br /> • Add enough water to cover the sample. <br /> • Observe the water surface for signs of discoloration/sheen and characterize <br /> No Sheen NS No visible sheen on the water surface <br /> Biogenic Film BF Dull, platy/blocky platy/blockyor foamy film. <br /> Slight Sheen(SS) Light sheen with irregular spread, not rapid. May have small spots of <br /> color/iridescence. Majority of water surface not covered by sheen. <br /> Moderate Sheen(MS) Medium to heavy coverage, some color/iridescence, spread is irregular to <br /> flowing. Sheen covering a large portion of water surface. <br /> Heavy Sheen (HS) Heavy sheen coverage with color/iridescence, spread is rapid, entire water <br /> surface covered with sheen. Separate-phase hydrocarbons may be <br /> evident during sheen test. <br />