UST certification exam 2023 -Solved

site check - ANSWER-the investigation of an UST site for the presence of a release when evidence indicates that a release may have occurred, but existence is not confirmed site assessment - ANSWER-an investigation to determine if a release has occurred what situations require a site check? - ANSWER-1. contamination from regulated substance discovered at UST site that is not permanently closed (discovery of regulated substance or its constituents) 2. if contamination is discovered off-site and an UST is suspected source of release what situations require a site assessment? - ANSWER-1. owner applies for a temporary closure extension beyond 12 months 2. UST undergoing a change-in-service to non-regulated substance 3. UST permanently closed-in-place 4. UST permanently closed and removed 5. UST was permanently closed or abandoned before 12/22/1988 and DOE determines suspected release may pose a threat. What site background should you recieve? - ANSWER-Location, UST data, Site data, hydrogeological and soil characteristics, and land use data what does location data encompass? - ANSWER-maps, previous owners and operaters what UST system data should you collect? - ANSWER-installation, installer, use and status, tank specs and locations, any previous removed tanks, substances stored, backfill materials and specs (depth and width), leak detection systems, secondary containment, GW wells onsite, location of old or dead man anchors and history of compliance and performance (previous leaks, etc). site data? - ANSWER-property lines, tanks and structure location, utility locations, pavement hydrogeological and soil characteristics - ANSWER-soil types and characteristics, surface drainage characteristics, depth to GW, hydraulic connections between GW and SW, uses of GW, public drinking water, aquifers, previous data. land use data - ANSWER-location of near UST, previous site uses, surrounding land use, other potential sources of contamination, potentially sensitive receptors, on site waste handling procedures what activities do you need to conduct at a site inspection? (6) - ANSWER-1. visually inspect surface 2. locate and verify UST and pipes 3. confirm fill status/compare with inventory records 4. determine tank size 5. inspect for above ground utilities, look at surface for below ground indications 6. do call for utilities. what are some examples of areas to check for leaks or releases? - ANSWER-1. vent pipes/fill holes 2. pavement patching 3. storm drains 4. fill boxes 5. waste collection areas 6. storm sewers 7. repair bays 8. facility records what should a field sampling plan include? - ANSWER-1. conditions leading to site check (assessment) 2. sample methods (# collected, locations, unique ID, containers, analysis, name of lab, QA/QC) When can an alternate sampling procedure be used? - ANSWER-only if it can be justified in writing, and is based primarily on technical considerations. Site assessor needs to demonstrate the ASP is equally as likely to determine if a release from a UST has occured what health and safety requirements are necessary? - ANSWER-1. HASP 2. Level D PPE at a minimum what are the recommended contents of HASP? - ANSWER-1. description and history of site 2. work hazard evaluation 3. filed activities and tasks covered by site safety plan 4. protective and monitoring equipment requirements (PPE, monitoring equipment) 5. site org and control of workers 6. decon 7. personnel and responsibilities 8. emergencies when sampling from an open excavation, what is the minimum depth of soil that must be removed? - ANSWER-6" how many samples are to be collected in tanks with less than 20,000 gal? - ANSWER-3 samples, one from each end and one from middle side how many samples are to be collected in tanks with more than 20,000 gal? - ANSWER-5 samples, one from each end, two from one side, and one in middle of other side. additionally, where should you collect a soil sample around piping systems - ANSWER-every 50 ft of piping. adjacent to piping joints or elbows, should be spaced to provide max distance between samples unless otherwise indicated. where should you also collect a soil sample? - ANSWER-at least 1 sample at each dispensing island at a depth of 2' below where piping enters when multiple tanks are removed, how many samples should be taken in addition and where? - ANSWER-one sample from beneath each additional tank being removed min sample for each cubic yd soil: 0-100 101-500 501-1000 greater than 2000 - ANSWER-3, 5, 7, 10, 10 +1 for each 500 yds^3 when must GW samples be collected? - ANSWER-1. lowest point of UST is in GW 2. field equipment indicates release and lowest point of UST is in 2' of seasonal high water level 3. existing MW on site and conditions allow for sampling or located in area to provide useful data 4. physical conditions prevent collecting soil and GW is used as an alternative approach 5. conditions associated with site check suggest GW assessment necessary to protect human and environmental health when and where are samples collected if direction of GW flow is know? - ANSWER-3 samples, one upgradient and two down gradient if GW flow is unknown how many and where are samples collected? - ANSWER-4 samples, one midway along each of four walls of excavation when is the release considered to be confirmed and no sampling is required? - ANSWER-when the liquid-free product or highly contaminated soil is discovered, must report to tank owner and DOE when must samples be delivered to lab? - ANSWER-within 48 hours of collection gasoline constituents ten to separate into four phases: - ANSWER-1. vapors 2. dissolved in GW 3. absorbed in soil 4. floating GW TPH - ANSWER-total petroleum hydrocarbons Laboratories provide 4 QA/QC assurance checks - ANSWER-1. check standards 2. dup 3. spikes 4. blanks check standards - ANSWER-used to estimate precision of the method and check for bias due to calibration duplicate analysis - ANSWER-used to check the precision of the actual samples spikes - ANSWER-test for bias due to chemical interference blanks - ANSWER-to estimate the limit of detection of the method and check for laboratory contamination when is a release confirmed after lab results? - ANSWER-if any constituents are above action level a person conducting a site check where a release has not been confirmed - ANSWER-must submit a checklist to department within 30 days following completion of site check report to department must include: - ANSWER-1. name of person registered and firm 2. location of UST on site vicinity map 3. brief summary of info obtained during inspection that was conducted prior to sampling even 4. UST system data 5. soil characteristics 6. any GW in tank excavation 7. brief description of land use 8. field sampling summary 9. site sketch showing field sampling locations 10. any factors that could have compromised data quality 11. results table 12. conclusion what are the 5 major chemical groups of gasoline? - ANSWER-1. aliphatics 2. alkanes 3. alkenes 4. aromatics 5. napthalenes MTBE - ANSWER-methyl-tert-butyl-ether and ethanol. use dto slow burning rate of gasoline.