This PowerPoint will describe what delineations are and how they are done.

1. Soil Delineations
This PowerPoint will describe what delineations
are and how they are used

2. Soil Delineation
• Delineations are done after an underground
storage tank (UST) is removed and an above
5100 ppm contamination is found
• Delineations define a boundary between dirty
and clean soils

3. Delineation
• Delineation is a technique used to find the
area of contamination
This helps technicians
understand how far
horizontally and
vertically the
contamination goes

4. How delineation is done
• A series of 1.5’’ diameter holes called borings
are collected to see a vertical column of soil
• One boring only tells about the soil at a
specific point
• Multiple borings are needed to determine the
area of contamination
• Each boring will be used as a sample

5. 1st Boring

6. 2nd Boring
When a clean sample is found it is
assumed that the soil beyond that
point is also clean

7. 3rd Boring
When a clean sample is found it is
assumed that the soil beyond that
point is also clean

8. 4th Boring

9. 5th Boring

10. 6th Boring

11. 7th Boring

12. 8th Boring

13. 9th Boring

14. 10th Boring

15. Determine Remediation Area

16. Reading Boring Samples
• Using the soil core, the depth of
contamination is found
• Combining multiple boring samples gives you
the length, width, and depth of contaminated
soils

17. Extra Information
• When contamination is found, a 24’’ hole is
made below the site to check for bedrock or
groundwater.
• If either are encountered a groundwater
investigation is required by NJDEP law.

18. What is ground water?
• Ground water is water held in solid and
between pores and cracks in rocks
• It is like an underground sponge that holds
water in its pores

19. Groundwater Investigation
• When bedrock is encountered a permanent
well is installed and a period of 2 weeks is
needed before samples can be taken
• When groundwater is encountered a
temporary well is installed and groundwater
can be sampled the same day, these wells are
good for up to 48 hours

20. Ground water continued
• If groundwater samples come back above the
state requirement further remediation is
necessary