EP 1110-1-18
24 Apr 00
b. The areas cleared and techniques used must be coordinated with the district
environmental staff and documented in the Work Plan. A UXO Technician II must always escort
the brush clearing crew in areas not previously cleared of OE. The safety requirements in EM
385-1-1 must be followed. PPE will be provided to the brush clearance crew and used as
required for protection. All brush clearance personnel must be trained in the safe operation of the
equipment and must have obtained site-specific safety training in accordance with Chapter 24.
12-4. OE Surface Removal. OE surface removals are conducted to remove all OE from the
surface of the work area. UXO qualified personnel will flag, identify, and record the
approximate location of all discovered OE for subsequent destruction. In addition, all OE scrap
and non-OE related materials that may interfere with the geophysical investigation should be
collected and stored for later disposition.
12-5. Geophysical Investigation. The purpose of the geophysical investigation is to acquire
geophysical data and identify all anomalies which resemble UXO/OE. Geophysical
investigations may be completed using detection equipment with real time or post-processing
discrimination techniques. The latter requires the collection and recording of geophysical data
which is subsequently processed by commercial software to identify electronic signals
representative of anomalies. All anomalies selected for excavation will be mapped, documented
on dig-sheets, physically re-established by precise survey methods, and marked for investigation.
Information on the elements which must be considered when planning and executing a
geophysical investigation is provided in Chapter 21.
12-6. OE Subsurface Removal.
a. Intrusive activities are conducted to investigate and identify the source of each
subsurface anomaly. Anomalies deeper than 12 inches may be excavated using mechanical or
manual methods. Only approved UXO personnel will perform excavations. All excavations will
be performed in accordance with the provisions of 29 CFR 1926, subpart P.
b. After the probable source of the subsurface anomaly is removed, the excavation will be
rechecked with a magnetometer or other ordnance detector prior to backfilling. If the location
does not produce another anomaly upon the recheck, then the excavated area will be backfilled
and restored in accordance with contract requirements. If a UXO item is recovered, the location
will be marked and the item disposed of in accordance with project approved procedures.
c. Evacuations. Evacuations are sometimes necessary when conducting intrusive
investigations in order to minimize the risk of the operation. An exclusion zone distance is
calculated to ensure that all non-essential personnel are outside of that distance during the
conduct of the excavation. The exclusion zone distance can be reduced by implementing
engineering controls. The use of engineering controls is presented in Chapter 21.
12-3
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