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Appendix H at the Putnam
Oswego Former Gas Plant
Ryan Carroll & James Hodges
GES, Inc.
October 11, 2012
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Site Map
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Site History
Operated as a Lean Oil Plant from 1963 to
1978
Operated as a Cryogenic Plant from 1978
to 1994
Site is currently used as a Natural Gas
Compression Station
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Site Hydrogeology
Located above Rush Springs Aquifer
Groundwater depth at site ranges between 19 – 44 feet. Groundwater generally between 25 - 30 feet
Sand, silt and clay in the top 10 -15 feet
Siltstone and Sandstone from approximately 10 – 45 feet
Groundwater flow is towards the west/southwest
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Assessment & Remediation
Background
Assessment
• Initial subsurface investigation conducted in
1996
• Monitoring wells installed in 1997 and 1998
• Comprehensive Assessment completed in 2000
Plume delineation completed
• Sources of petroleum hydrocarbons appear to
be from former pipelines and USTs/ASTs
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Assessment & Remediation
Background
Remediation
• Active product recovery system installed in MW-G in 2000. In addition, passive product recovery (with passive bailers) was conducted at select wells
• Active product recovery system in operation from 2001 – 2008
• Passive product recovery completed at multiple wells from 1999 – 2010
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Site Closure Rationale
Vertical and horizontal delineation of
petroleum plume
No sensitive receptors within the site
vicinity
No completed exposure pathways
No potable wells within ½ mile of the site
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Site Closure Rationale
Plume size and concentration has significantly decreased over time due to both engineered and natural remediation
The Corporation Commission has agreed that the remediation technology has removed product to the maximum extent practicable
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Petroleum Plume Size in 2000
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Petroleum Plume Size in 2010
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Petroleum Plume Overlay 2000/2010
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Site Closure Rationale
Groundwater sampling for key indicators
has demonstrated, to the Corporation
Commission’s satisfaction, that degradation
of petroleum hydrocarbons by natural
microorganisms is occurring at the site, and
in time will naturally finish remediating the
site.
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Appendix H Rationale
Sources have been removed or are no longer in use
Extensive remediation completed at site (active and passive product removal)
The free product has been removed to the maximum extent practicable
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Appendix H Rationale
Residual impacts are considered
technically infeasible to remediate
using standard available technologies
Natural degradation of petroleum
constituents is occurring
There is no anticipated economic impact to
include this site in Appendix H
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Appendix H Rationale
Benefits the public by not allowing use
of shallow groundwater with residual
petroleum impacts while residual
petroleum is in the groundwater
Allows potential future use of the
deeper aquifer, while casing off the
shallow groundwater
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Appendix H Proposal
Require future water wells to case and
cement from the surface to 50’deep,
gravel pack below that
This will prevent use of shallow
groundwater and prevent residual
impacts from migrating down the well
pack into deeper aquifer
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Appendix H Proposal