Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 734 - PETROLEUM UNDERGROUND STORAGE TANKS
Subpart D - MISCELLANEOUS PROVISIONS
Section 734.425 - Soil Borings
Universal Citation: 35 IL Admin Code ยง 734.425
Current through Register Vol. 48, No. 38, September 20, 2024
a) Soil borings must be continuously sampled to ensure that no gaps appear in the sample column.
b) Any water bearing unit encountered must be protected as necessary to prevent cross-contamination during drilling.
c) Soil boring logs must be kept for all soil borings. The logs must be submitted in the corresponding site investigation plan, site investigation completion report, or corrective action completion report on forms prescribed and provided by the Agency and, if specified by the Agency in writing, in an electronic format. At a minimum, soil boring logs must contain the following information:
1) Sampling device, sample number, and amount
of recovery;
2) Total depth of
boring to the nearest 6 inches;
3)
Detailed field observations describing materials encountered in boring,
including but not limited to soil constituents, consistency, color, density,
moisture, odors, and the nature and extent of sand or gravel lenses or seams
equal to or greater than 1 inch in thickness;
4) Petroleum hydrocarbon vapor readings (as
determined by continuous screening of borings with field instruments capable of
detecting such vapors);
5)
Locations of sample(s) used for physical or chemical analysis;
6) Groundwater levels while boring and at
completion; and
7) Unified Soil
Classification System (USCS) soil classification group symbols in accordance
with ASTM Standard D 2487-93, "Standard Test Method for Classification of Soils
for Engineering Purposes," incorporated by reference in Section
734.120
of this Part, or other Agency approved method.
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