En Core samplers

to the center of each soil core using a glass syringe

ing that was held in place with plastic end caps.

after a pilot hole had been made. Immediately af-

Two subsamples were taken from the third core

ter each spiking, the same wrapping used to cover

barrel liner, one from each end, using the proce-

the bottom was used to cover the top. Two time

dure described for the first section. The fourth core

zero ("D0,") control samples were prepared by

barrel liner was wrapped in the same fashion as

placing an entire core barrel liner into a 2-oz (60

the second liner. Lastly, a subsample was taken

mL) wide-mouth VOA bottle, spiking with 1.00

from the bottom of the fifth core barrel liner. This

mL of the aqueous solution, and then immediately

sequence of sampling and wrapping core barrel

adding 50 mL of MeOH and capping. The cov-

liners was performed on three separate locations.

ered core liners were placed in a refrigerator (4

The wrapped samples were immediately refrig-

2C) and duplicates of each of the four different

erated (4 2C), and one core barrel liner from

wrapping configurations were removed after 2

each of the three sets was removed after two and

and 6 days of storage. After storage coverings were

four days of storage and subsamples were re-

removed, and each core barrel liner was placed in

moved from both ends. The subsamples were re-

a 2-oz (60-mL) VOA bottle and 50 mL of MeOH

moved following the description given earlier for

was added as with the controls.

core barrel liners and prepared for analysis follow-

ing the same procedures that had been used in the

field.

Field experiment

Five brass core barrel liners (2.5 cm o.d. 8.6 cm

En Core samplers

long) were filled with soil after being placed end-

on-end inside of a Mostap sampler that was then

Laboratory experiment

pushed into a contaminated formation by a cone

Twenty 5-g En Core samplers were filled with

penetrometer truck. After extraction, the core bar-

relatively clean soil one at a time by pushing them

rel liners were removed from the barrel of the

into an undisturbed surface created by removing

Mostap sampler one at a time, so that the bottom

the first 28 cm. After each sampler was filled, a

of the soil core was available first. When the first

pilot hole was made into the middle of the soil

plug using a 21-gauge needle. Using a 50-L glass

core barrel liner section, and sequentially the fol-

syringe (22-gauge needle), we added 50-L of a

lowing sections, cleared the outer barrel, a flat-

bladed knife was used to make a smooth cross-

dilute aqueous solution of the same nine analytes

sectional cut between the two rings. In the field, a

cited previously. After spiking each En Core sam-

subsample (≈5 g) was removed from the top of

pler was capped and enclosed in a foil resealable

the first core liner with a 5-mL modified syringe.

bag.

This subsample was placed immediately into a 22-

In the laboratory, five of the En Core samplers,

mL VOA vial containing 10 mL of water and

distributed from near the beginning to the end of

capped, to establish the D0 values (Fig. 5). The

the field collection and treatment process, were

ends of the second core barrel liner were wiped

opened one at a time and the contents were ex-

clean, then thin metal disks (same diameter as the

truded into weighed 40-mL VOA vials containing

core barrel liner) were placed over the ends and

5 mL of MeOH. These samples were used to es-

wrapped with translucent, nonelastic Teflon sheet-

tablish the D0 concentration. The remaining En

Arrangement of Core Barrel Liners as Positioned in Mostap Sampler

Figure 5. In-field sampling and storage preparation of metal core barrel liners.

7