WA UST Site Assessor Exam

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