Current through Register Vol. 63, No. 3, March 1, 2024
(1) The following information must be kept
during the sampling events:
(a) A sketch of
the site must be made which clearly shows all of the sample locations and
identifies each location with a unique sample identification code;
(b) Each soil and water sample must be
clearly labeled with its sample identification code. A written record must be
maintained which includes, but is not limited to: the date, time and location
of the sample collection; the name of the person collecting the sample; how the
sample was collected; and any unusual or unexpected problems encountered during
the sample collection which may have affected the sample integrity;
(c) Formal chain-of-custody records must be
maintained for each sample.
(2) If soil samples cannot be safely
collected from the excavation, a backhoe may be used to remove a bucket of
native soil from each of the sample areas. The soil is to be brought rapidly to
the surface where samples are to be immediately taken from the soil in the
bucket.
(3) The following
procedures must be used for the collection of soil samples from open pits or
trenches:
(a) Just prior to collecting each
soil sample, approximately three inches of soil must be rapidly scraped away
from the surface of the sample location;
(b) To minimize the loss of volatile
materials, it is recommended that samples be taken using a driven-tube type
sampler. A clean brass or stainless steel tube of at least one inch in diameter
and three inches in length may be used for this purpose. The tube should be
driven into the soil with a suitable instrument such as a wooden mallet or
hammer;
(c) The ends of the
sample-filled tube must be immediately covered with clean aluminum foil. The
foil must be held in place by plastic end caps which are then sealed onto the
tube with a suitable tape;
(d)
Alternatively, samples may be taken with a minimum amount of disturbance and
packed immediately in a clean wide-mouth glass jar leaving as little headspace
as possible. The jar must then be immediately sealed with a teflon-lined screw
cap;
(e) After the samples are
properly sealed, they are to be immediately placed on ice and maintained at a
temperature of no greater than 4° C (39° F) until being prepared for
analysis by the laboratory. All samples must be analyzed within 14 days of
collection.
(4) The
following procedures must be used for the collection of water samples from the
tank pit:
(a) After the water has been purged
from the pit in accordance with OAR
340-122-0340(4)(a),
samples shall be collected as soon as sufficient water has returned to the pit
to allow representative sampling;
(b) Samples are to be taken with a device
designed to reduce the loss of volatile components. A bailer with a sampling
port is suitable for this purpose;
(c) The water is to be transferred into two
identical glass vials with as little agitation as possible and immediately
sealed with a teflon-lined caps. The vials must be filled completely so that no
air bubbles remain trapped inside;
(d) After the samples are properly sealed,
they are to be immediately placed on ice and maintained at a temperature of no
greater than 4° C (39° F) until being prepared for analysis by the
laboratory. All samples must be analyzed within 14 days of
collection.
(5) The
Department may approve alternative sampling methods which have been clearly
shown to be at least as effective with respect to minimizing the loss of
volatile materials during sampling and storage as the methods listed in
sections (1)-(4) of this rule.
Stat. Auth.: ORS 465.400 & ORS 466.746
Stats. Implemented: ORS 465.200 - ORS 465.455 & ORS
466.706 - ORS 466.835
