bishop tube site -...
TRANSCRIPT
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BISHOP TUBE SITE
Source Area Response Action
Public Hearing
January 30, 2007
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BISHOP TUBE SITE
Site Background/History
DEP Involvement
DEP Findings
DEP Response Action
Long-Term Plans
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Site Location
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Bishop Tube Site - Aerial View
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Operations History
1950s - J. Bishop
Precious Metals
Tube Milling and Manufacturing
1960s – 1990s Matthey Bishop, Whittaker Corp.,
Christiana Metals & Alloy Steel
Stainless Steel Tubing
1990s – Marcegaglia, USA
Updated Manufacturing Process – stainless tubing
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Stainless Steel Tube Manufacturing Process
Cold re-draw mill process involved repeatedly
lubricating tubing, drawing tubes through smaller die to
achieve smaller diameters. After each draw degreaser is
used to remove lubricants prior to physical and chemical
treatment to smooth or de-burr the external surfaces.
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Chemicals Involved
Welding gases
Lubricating oils
Chlorinated Solvents (Trichloroethene,
Tetrachloroethene, & 1,1,1–Trichloroethane)
Pickling Liquor (Strong Acids: Hydrofluoric acid &
Nitric acid)
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DEP Involvement
Early 1970s - discovered releases to Little Valley
Creek from waste acid (pickle liquor) lagoon
1980s - Groundwater contamination discovered
(fluoride initially, later chlorinated degreasers)
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DEP Involvement (cont’d)
1980s – 1990s - Voluntary actions by Christiana
Metals to study contamination
1990s - Treatment system installed on off-site
domestic well by Christiana Metals
1999 - Site abandoned by Christiana Metals and
HSCA Further Investigation began.
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DEP Involvement (cont’d)
Hazardous Sites Cleanup Program – Further
Investigation
Soil
Groundwater (shallow & deep)
Surface water (Little Valley Creek)
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Soil Sampling
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Well Drilling
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Well Sampling
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Stream Sampling
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DEP Findings
Onsite groundwater contaminated by TCE and other
chlorinated solvents
Deep (>200 ft) and shallow (<20 ft)
Evidence of free product (DNAPL)
Migration off-site confirmed – Bedrock geology
increases complexity
Onsite stream discharge of contaminated groundwater.
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Off-site groundwater contamination
One domestic well is contaminated (equipped with
treatment)
Modeling suggests discharge to Little Valley Creek far
downstream
Stream sampling seems to verify the model
Full extent of the contamination is not known
DEP Findings (cont’d)
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Three source areas identified during soil
investigations
Sources are consistent with manufacturing,
solvent storage and waste handling areas
Sources continue to contribute to groundwater
contamination
Potential for indoor air contamination due to
soil and shallow groundwater contamination
DEP Findings (cont’d)
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Source Areas/Hot Spots
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DEP Response Action
Cleanup of soil and shallow groundwater in the
three source areas coordinated with the new
property owner/developer
Developer agreed to address soil in the areas as
part of the purchase from the industrial
development authority
Plant #8 Area is primarily a shallow groundwater
problem
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DEP Response Action (cont’d)
DEP considered taking no action to address
groundwater at this time, and concluded:
Continued source of groundwater
contamination
Delay in action stops redevelopment plans
Cooperative action is more cost effective and
efficient
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DEP Response Action
Response involves coordinating actions on both
soil and groundwater in the three source areas
Treatment using Soil Vapor Extraction & Air
Sparging technology
Flexibility to supplement or change approach
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Soil Vapor Extraction/Air Sparging
Ground Surface
Water Table
Treatment
Shed
Bedrock
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Pilot Test Vapor Barrier
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DEP Response Action (cont’d)
Special Conditions for Response Action
Need for a vapor barrier to prevent indoor air contamination
Must allow for the use of the site while the system is working
Flexibility to change approach if system does not operate adequately
Injection of chemical or biological amendments to destroy contaminants
Introduction of heat or steam to destroy contaminants
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Long-Term Plans
Complete evaluation of the stream impact (on site)
Evaluate options for cleanup (including another
chance for community input)
Develop a plan for studying off-site groundwater
contamination and assessing associated risks
Continue to seek the involvement of Potentially
Responsible Parties in the Cleanup Actions
Additional phases of cleanup action
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Questions?
?
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Dustin A. Armstrong
PA Department of Environmental Protection
2 East Main Street
Norristown, PA 19401
Phone: (484)250-5723
Written Comment Deadline: March 16, 2007
Contact Information