Site Check Definition
Suspected Release - confirms or denies suspected release
Site Check Conditions
- Discovery of Regulated Substance
- UST Release method detects release
- Receive Direction from Ecology
- Offsite contamination and UST is suspected source
Site Assessment Definition
Not a suspected release - investigates whether release has occurred
Site Assessment Conditions
- Suspension of financial responsibility
- Stored substance goes from regulated to unregulated
- permanent closure after removal if abandoned before dec 22, 1988
- Permanent in place closure
- Extend temporary closure beyond 12 months
What must site assessment report include for soil characterization
description of soil gradient
soil classification
till material
Hand Augur/Soil Corer
Remove top 6 inches of soil
use if large rocks cemented soil and deep sample point not issue
Split Spoon
Requires a drill
cant sample in rocky conditions
Shelby Tube
Requires a drill
Collects undisturbed sample
Backhoe
Used for rocky surfaces and large quantities of debris
collect at sidewall and bottom
Hand Tool
Collect at center of bucket at least 6 inches deep
use for stock piled soil
Where is contamination most likely present
lowest point of interface between backflow material and native soil
Where do you collect if water is encountered
at the top of the water table
Conditions for ground water sampling
- lowest point of ust is in ground water
- field screening indicates release and lowest point is within 2 ft of season high water table
- existing wells can be collected fro
- observation wells indicate presence of substances
- physical conditions prevent soil sampling
- site check results indicate groundwater testing is needed
How many groundwater samples do you take with unknown gradient
4
how many water samples do you take when gradient is known and where
3 - one up and two down
Common contaminent phases
- vapors
- dissolved in groundwater
- absorbed to soil
- in soil pore space
- floating on groundwater
What is required in field sampling for QA/QC
one duplicate per matrix
What is required to ecology and when is it required if no contamination is found during site assessment
- Sight Assessment Checklist
- permanent closure checklist
within 30 days
What is required to ecology and when is it required if contamination is found during site assessment
SA Checklist and permanent closure checklist to ecology within 30 days.
Must give 24 hour notice to ecology of release
Sample Number in place tank less than 9000 cubic yards
3
Sample number in place tank greater than 9000 cubic yards
4
sample number excavated tank less than 9000 cubic yard
3
sample number excavated tank greater than 9000 cubic yards
5
Sample number multiple tanks in place less than 9000
4 for first tank 2 for each additional tank
