(Environmental investigation of ground water contamination at Wright-Patterson Air Force Base, Ohio) Page: 47 of 225
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Procedure No. Rev.
DECONTAMINATION OF
SAMPLING EQUIPMENT FP 3-1 1 Page 4 of 6
. Rinse plastic or Teflon-coated equipment with 10% nitric acid; rinse
stainless steel equipment with 1% hydrochloric acid.
. Rinse with deionized analyte-free water.
. Rinse with pesticide-grade methanol.
. If total petroleum hydrocarbons, oil & grease, or PCBs are analytes, rinse J
with pesticide-grade hexane.
. Air dry:
* Check with HNU or OVA for complete removal of solvents.
. Rinse twice with deionized analyte-free water.
. Wrap in aluminum foil (shiny side out).
NOTE 1: Sampling Equipment Decontamination Procedures. Sampling equipment, other
than down-hole sampling equipment, will be cleaned once a day in a batch so that
the final rinsate may be collected for a field equipment blank. After cleaning, field
equipment may be placed temporarily on polyethylene sheeting, but ultimately will
be wrapped in aluminum foil. Care will be taken when choosing the site of the
staging area to avoid fugitive dust, fuel, oils, gasoline, organic solvents, or any
potential airborne source of contamination. If new equipment, such as drill bits and
spoons, has been painted at the factory, this paint will be removed before use.
Down-hole sampling equipment may be decontaminated on-site during drilling
activities. The sampling method used will determine where this sampling
equipment will be decontaminated.
NOTE 2: Disposal of all wastes generated during the field activities is described in the
project-specific Work Plan.
8.2 Requirements and Limitations
Bailers and Bailing Line
The potential for cross contamination between sampling points via the use of a common
bailer, or its attached line, is high unless strict procedures for decontamination are followed. It
is recommended that one bailer and its associated line be used for each sample point. Braided
nylon or polypropylene lines may be used with a bailer and will be discarded after each use.
Before the initial sampling and after each succeeding sampling point, the bailer must be
decontaminated using procedures outlined for sampling equipment. This procedure does not
eliminate the need for decontamination of dedicated bailers.
In addition to these cleaning procedures, the following line and bailer handling
procedures are required. Prior to transport, the bailer and bailing line should be wrapped in
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(Environmental investigation of ground water contamination at Wright-Patterson Air Force Base, Ohio), report, October 1, 1991; United States. (https://digital.library.unt.edu/ark:/67531/metadc1055332/m1/47/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.