WA UST Site Assessor Exam Questions and Answers 2023 with complete solution

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WA UST Site Assessor Exam Questions and Answers 2023 with complete solution What is the hold time for soil and preserved GW GRO samples? ✔Ans✔ 14 days Is an ICC certification needed to inst... all 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 Purpose of a site check ✔Ans✔ To investigate a UST site for the presence of a release when evidence indicated that a release may have occurred Purpose of a site assessment ✔Ans✔ To investigate a UST site at the time of closure or change-in-service to determine if a release has occurred Site check vs. site assessment ✔Ans✔ A site check is an investigation of a UST site for a release when evidence indicates that one many have occurred; a site assessment determines if a release has occurred If a confirmed release is identified and reported within 24 hours, what is and is not required? ✔Ans✔ A site assessment is not required; a site characterization is required What is the historical date before which a UST system may have been permanently closed or abandoned that ECY may require a site assessment? ✔Ans✔ December 22, 1988 [Show More]

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