WA UST Site Assessor Exam Questions With Complete Solutions | 100% Pass

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