Nebraska Administrative Code
Topic - FIRE MARSHAL, STATE
Title 159 - UNDERGROUND STORAGE TANKS
Chapter 10 - OUT-OF-SERVICE UST SYSTEMS AND CLOSURE REQUIREMENTS
Section 159-10-003 - ASSESSING THE SITE AT CLOSURE OR CHANGE-IN-SERVICE
Universal Citation: 159 NE Admin Rules and Regs ch 10 ยง 003
Current through September 17, 2024
The requirement of 40 CFR 280.72 as it existed on July 15, 2015 are adopted and incorporated by reference.; and
003.01 If free product is present on the ground water at the time a tank is removed, sampling of the soil and ground water does not need to be conducted for the assessment report, provided the Department of Environment and Energy is notified and the owner and/or operator begins remedial action in accordance with Neb.Rev.Stat. §81-15, 123.
003.02 Analysis of samples. Soil and ground water samples taken at time of closure will be analyzed by laboratory methods to detect and quantify the presence of the regulated substances that have been stored in the tank system.
003.02A. Samples will be collected,
transported and analyzed using sample collection procedures, instrumentation,
and test methodologies approved by the Department of Environment and Energy. At
a minimum the following additional requirements must be met:
003.02A1. Test methodology procedures
regarding proper handling and preservation of samples will be
followed.
003.02A2. Proper chain of
custody will be maintained for each sample.
003.02A3. Samples will be immediately sealed
in their appropriate containers after collection.
003.03 In-Place Closure Assessment
003.03A. Soil borings must
provide the necessary data to document site conditions. The soil borings will
be a minimum of two inches in diameter and be completed using a hollow stem
auger. Drilling to and sampling of ground water will be performed in accordance
with the Department of Health and Human Services' Title 178. Evidence of
petroleum contamination in the soils or ground water and the corresponding
depth of contamination will be documented in the State Fire Marshal closure
assessment report. Notification of any contamination will be made in accordance
with 004.02 of this Chapter.
003.03B.
Tank Assessment
003.03B1. One boring will be drilled through
the backfill at each end of each tank. If the distance between any of the
borings exceeds 25 feet, as measured along the excavation perimeter, a boring
midway between the two is necessary.
003.03B2. All borings will continue until
evidence of soil contamination is no longer present, at which point a soil
sample is collected for laboratory analysis. If evidence of soil contamination
continues to ground water, then a sample of ground water for laboratory
analysis is also required.
003.03B3. One soil sample will be collected
for every 10 feet of boring advancement. If ground water is encountered, one
sample of ground water will be collected at the base of each boring. Each
ground water and/or soil sample will be analyzed in accordance with 003.02 of
this Chapter.
003.03B4. Soil
samples will be collected in a manner to minimize disturbance of the soil
structure. The predominant soil type of each sample (e.g., clay, sand, gravel)
will be recorded separately and submitted on a boring log as an addendum to the
closure assessment report.
003.03C.
Line Assessment
003.03C1. One boring will be drilled at the
point where the product lines leave the tank excavation.
003.03C2. One boring will be drilled within 3
feet of each dispenser island. The borings will be placed in the best estimated
down gradient direction of ground water flow.
003.03C3. If the running length of the
product line between the borings required in 003.03C(C1) and 003.03C(C2) of
this Chapter exceeds 25 feet, additional borings will be placed so borings are
equally spaced and there is never more than 25 feet between any
borings.
003.03C4. All product line
borings will conform to 003.03B2 of this Chapter.
003.03C5. Samples will be collected and
analyzed as required in 003.03B3 and 003.03B4 of this
Chapter.
003.04 Removal Closure Assessment. All underground storage tanks and all product piping will be inspected for corrosion holes and/or other points of leakage. A description of the inspection methods, and if leakage is verified, a description of the cause and location must be submitted to the State Fire Marshal in the closure assessment report. Notification of any contamination will be made in accordance with 004.02 of this Chapter.
003.04A. Each tank, its associated piping,
and dispenser will be visually inspected for holes, cracks, corrosion or any
signs of leakage. All welds and seams must be thoroughly scraped and inspected.
The capacity and dimensions of each tank will be recorded. Results of these
inspections will be documented in the State Fire Marshal closure assessment
report.
003.04B. All piping must be
exposed and inspected in place.
003.05 Tank Excavation
003.05A. Backfill material will be removed to
expose undisturbed native soils at the base of the excavation.
003.05B. The base of the excavation will be
inspected for contamination and, if present, the owner/operator has the option
to over excavate all areas of contamination until clean soils are encountered.
Over excavation done in this manner is subject to Neb.Rev.Stat §81-15, 123. To verify that soils
are free of contamination, soil samples will be collected from the floor of the
over excavated basin and analyzed in accordance with 003.02 of this
Chapter.
003.05C. The final
disposal location of contaminated soil and each tank will be reported on the
State Fire Marshal closure assessment report. Soil disposal procedures are
subject to Department of Environment and Energy oversight.
003.05D. One sample will be collected at each
end of the tank from native soil at the base of the excavation for laboratory
analysis. If signs of leakage/contamination are observed, additional native
soil samples will be collected at the points of leakage for analysis. If
groundwater is encountered and covers the entire excavation basin, one
groundwater sample will be collected and analyzed. If groundwater does not
cover the entire excavation basin, samples will be collected from the exposed
soil as previously stated in this section and analyzed in addition to the
groundwater sample. The groundwater and/or soil samples are to be prepared and
analyzed in accordance with 003.02 of this Chapter.
003.06 Line Excavation Assessment
003.06A. All product piping will be removed
by trenching and exposing the entire length of the lines.
003.06B. The procedures described in 003.04A
and 003.04B of this Chapter will be followed.
003.06C. One soil sample will be collected
for laboratory analysis every ten (10) feet from the native soil at the base of
the piping excavation, beginning at the tank excavation perimeter and extending
to the dispensers. If signs of leakage/contamination are observed, additional
soil samples will be collected for analysis at the points of leakage. The soil
samples are to be prepared and analyzed in accordance with 003.02 of this
Chapter.
003.06D. The base of the
excavation will be inspected for contamination and, if present, the
owner/operator may over excavate according to the procedures in 003.05B and
003.05C of this Chapter.
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