WA UST Site Assessor Exam Questions & Answers With Complete Solution 2024

WA UST Site Assessor Exam Questions & Answers With Complete Solution 2024 What is the hold time for soil and preserved GW GRO samples? Correct Answer 14 days Is an ICC certification needed to install an AST? Correct Answer No Flammability limits of gasoline Correct Answer 1.4 to 7.6% How many days do you have from a tank closure to report/provide the UST checklist to ECY? Correct Answer 30 days MTCA Method A lead CUL, soil Correct Answer 250 mg/kg MTCA Method A lead CUL, GW Correct Answer 15 ug/L Is the vadose zone saturated or unsaturated? Correct Answer Unsaturated List in order of most mobile to least mobile: Bunker C, heating oil, diesel, gasoline Correct Answer Gasoline, diesel, heating oil, Bunker C Is oxygenated gasoline more or less likely to dissolve in water? Correct Answer More likely; fuel additives like MTBE are more soluble than gasoline Where to sample on dispenser? Correct Answer 2 feet below where the piping enters the UST Where to sample along piping? Correct Answer 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? Correct Answer 3; 1 upgradient, 2 downgradient What vapor is an FID used to measure? Correct Answer Methane What is a PID measuring? Correct Answer Mixture of all volatiles