MIL-HDBK-1005/9A
volume of contaminated surface runoff requiring treatment. The
use of high-pressure water and/or detergents for cleanup of work
area is not recommended because they increase oil emulsification
and inhibit oil-water separation by gravity. For spill cleanup,
use dry absorbents and sweep whenever possible. Dispose of
absorbents as solid waste material.
3.2.3
Aircraft Washracks and Rinse Areas. Equipment is
usually cleaned with detergents, corrosion inhibitors, and other
cleaning compounds by brushing and high-pressure water rinses to
remove oil, dirt, and seawater. The most feasible alternative
to remove free oil fraction would be pretreatment prior to
discharging to the sanitary sewer. Outside areas located
adjacent to runways usually employ a potable water rinse to
remove salt as aircraft land. Rinse water may require treatment
to prevent long-term buildup of oil and grease in the soil,
which could result in contaminated surface runoff to receiving
drainage systems or contaminated infiltration to groundwater
supplies. Confirm treatment and groundwater monitoring
requirements with regulatory agency.
3.2.4
Tank Farm Operations. The soil around large buried
fuel or oil storage tanks is often dewatered by a perforated
underdrain system. Fuel or oil may enter the soil by tank
overflows or structural failure. It can seep into the
surrounding soil and drainage system and create a potential
ground water contamination problem. The movement of the fuel or
oil through the soil to the drainage system is enhanced during
periods of precipitation and/or the presence of a high water
table. Contaminated soil should be removed and replaced with
uncontaminated materials, and the drainage pipe cleaned. If not
feasible, provide oily wastewater treatment system. Complexity
of system will depend on required effluent quality. Provide
containment facilities, such as skimming dams or diversion ponds
for fuel or oil transfer areas to prevent spills from reaching
surface water bodies and underground drainage systems.
Containment area will require a chemical resistant, impermeable
lining. Provide containment areas around storage tanks as
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