the probe(s) from contaminating the water in the well. In no case should field analyses be
performed directly on samples that will be submitted for laboratory analysis.
The QAPjP to be included in the permit application should list the specific parameters
that will be measured in the field. The QAPjP should specify the types of instruments (e.g.,
in line flow cells, downhole probes, meters) that will be used to make field measurements,
and describe the procedures that will be followed in operating the instruments and recording
the measurements. The QAPjP should describe all instrument calibration procedures,
including the frequency of calibration. The description of calibration procedures should
include: discussion of initial calibration, multi level calibration for determination of usable
range, periodic calibration checks, conditions that warrant re calibration of instruments,
acceptable control limits, and the maintenance of calibration records in the field log book. At
a minimum, all field instruments should be calibrated at the beginning of each use and in
accordance with the frequency suggested by the manufacturer. Field instruments should be
calibrated using at least two calibration standards spanning the range of results anticipated
during the sampling event. For example, if ground water pH is expected to be near pH 7, the
two standards used to calibrate the pH meter should be pH 4 or pH 5, and pH 9 or pH 10,
respectively.
7.5
Sample Containers and Preservation
The procedures employed for sample containerization and preservation are nearly as
important for ensuring the integrity of the samples as the collection device itself.
Investigators should refer to Chapter Two of SW 846 for guidance relating to sample
containers and sample preservation. Detailed procedures for sample containerization,
preservation, packaging, and handling should be provided in the QAPjP. Regardless of the
analytes of concern, exposure of the samples to the ambient air should be minimized.
7.5.1
Sample Containers
The Agency has identified several general performance standards that apply to the
selection and use of sample containers relative to ground water monitoring. These are as
follows:
The QAPjP should identify the types of sample containers that will be used to
collect ground water samples, as well as the procedures that the owner/operator
will use to ensure that sample containers are free of contaminants prior to use.
Chapters Three and Four of SW 846 discuss sample container selection and
cleaning for inorganic and organic parameters, respectively.
Clean sample containers should be sealed and stored in a clean environment to
prevent any accumulation of dust or other contaminants. The cleanliness of a
November 1992
7 23






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