Monthly ground water sampling results, Livingston Rail Yard, Livingston, Montana

108 Pages·1992·3.5 MB·English

by  Envirocon, Inc

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1992 MOV/
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.MONTANA STATE LIBRARY
1515 E. 6th AVE.
HELENA, MONTANA 59S20
Fourth Quarter 1992
Ground Water Sampling Results
Livingston Rail Yard
Montana
Livingston,
Submitted
to:
Montana Department of Health and
Environmental Sciences
Solid and Hazardous Waste Bureau
Cogswell Building
Helena, Montana 59620
Submitted by:
Burlington Northern Railroad
9401 Indian Creek Parkway
Overland Park, Kansas 66201
Prepared by:
Envirocon, Inc.
P.O. Box 8243
Missoula, Montana 59807
Submittal Date:
February 1993
18,
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EN^HROCON, INC
3 0864 1006 6776 8
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INTRODUCTION
1.0
This report presents the results of ground water samples collected
within and aroimd the Livingston Rail Yard, in Livingston, Montana, during
the fourth quarter of 1992. Ground water sampling for this quarter consisted
ofthe November semiannual sampling event. Bxirlington Northern Railroad’s
revised Ground Water Sampling Plan, instituted in July 1992, does not require
groimd water sampling during October or December.
RESULTS
2.0
The samples were analyzed by Energy Laboratories, Inc. in Billings,
Montana. Results for the November semiannual sampling event are presented
below.
2.1 November 1992 Semiannual Groimd Water Sampling Event
The November 1992 semiannual sampling event was conducted on
November 24 through December 1992. Twenty-two samples were analyzed
2,
as part ofthis event: 19 primary samples and two duplicate samples collected
at monitoring weUs within and aroimd the Livingston Rail Yard and one trip
blank. The locations ofthese wells are shown on Figure 1.0. All saimples were
analyzed for purgeable halocarbons by EPA Method 601. Tables 1, 2, 3, amd
4 summarize quarterly analytical results for tetrachloroethene (PCE);
trichloroethene (TCE); cis-l,2-dichloroethene (DCE); and chlorobenzene,
respectively. Laboratory analytical results and a data validation report for this
sampling event are in Appendix A. Monitoring Well LS-8 was abandoned
during sludge removal at the overflow pond in October 1992 and therefore
could not be saimpled during the November 1992 semiannual sampling round.
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All other monitoring wells listed for semiannual sampling in the revised
Ground Water SampHng Plan were sampled during November 1992.
Most of the ground water samples collected during the November 1992
semiannual sampling round contained dissolved chlorinated-VOC
concentrations that continued the general decline observed during the past
three years. Notable concentration changes in wells with sufficient previous
sample data are described below.
The November 1992 PCE concentration in the sample from Monitoring
Well L-87-5 was 72 parts per billion (ppb). This is 53 percent lower them the
average PCE concentration at this well in the past year and 76 percent lower
than the average PCE concentration at this well between May 1989 and May
1992, reported in the Final Draft Remedial Investigation Report (FDRI).
The November 1992 PCE concentration in the sample from Monitoring
Well 89-9 was 130 ppb. This is 30 percent lower than the average PCE
concentration at this well in the past year and 50 percent lower than the
average PCE concentration at this well between February 1990 and May 1992,
reported in the FDRI.
The November 1992 PCE concentration in the sample from Monitoring
Well 92-1 was 160 ppb. As shown on Table PCE concentrations at this weU
1,
have shown a decline from the 850-ppb value measured in February 1992 prior
to the installation of a soil vapor extraction system at the Locomotive Shop
manways.
The sample from Monitoring Well 92-3 did not contain any detectable
VOCs during the November 1992 s£unpUng round. This well was installed in
July 1992 to investigate VOC concentrations in this part of the LRY. As
2
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shown on Table the only previous sample collected at this location (August
1,
1992) contained 1.2 ppb of PCE.
2.2 Free-Product Thickness Measurements
Free-product thicknesses were measured at wells sampled within the
free-product plume during the November 1992 semiannual samphng round.
However, a more complete set of free-product thickness measurements were
taken in early January 1993. January 1993 measurements also included wells
that were part of the pilot-scale hydrocarbon recovery system and the trench
recovery system. Therefore, the early January 1993 measurements were used
to construct Figure 2.0, showing the product thicknesses in the free-product
plume.
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FIGURES
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