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WA UST Site Assessor Exam Questions and Answers

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WA UST Site Assessor Exam Questions and Answers What is the hold time for soil and preserved GW GRO samples? - ANS 14 days Is an ICC certification needed to install an AST? - ANS No Flammability limits of gasoline - ANS 1.4 to 7.6% How many days do you have from a tank closure to report/provide the UST checklist to ECY? - ANS 30 days MTCA Method A lead CUL, soil - ANS 250 mg/kg MTCA Method A lead CUL, GW - ANS 15 ug/L Is the vadose zone saturated or unsaturated? - ANS Unsaturated List in order of most mobile to least mobile: Bunker C, heating oil, diesel, gasoline - ANS Gasoline, diesel, heating oil, Bunker C Is oxygenated gasoline more or less likely to dissolve in water? - ANS More likely; fuel additives like MTBE are more soluble than gasoline Where to sample on dispenser? - ANS 2 feet below where the piping enters the UST Where to sample along piping? - ANS Every 50 linear feet and along joints/elbows How many GW samples are needed after decommissioning if a release to GW is confirmed, and where relative to the tank? - ANS 3; 1 upgradient, 2 downgradient What vapor is an FID used to measure? - ANS Methane What is a PID measuring? - ANS Mixture of all volatiles What conditions might impede a PID? - ANS Moisture/humidity, dust, transformers, power lines What UST capacity does not require a site assessment at closure? - ANS Less than 110 gallons

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