2009-09-25_PERMIT FILE - M2009076 ‎(42)‎

• Permit No: M2009076
• IBM Index Class Name: PERMIT FILE
• Doc Date: 9/25/2009
• Doc Name: EPA Superfund Record of Decision
• From: Venture Resources
• To: DRMS
• Media Type: D
• Archive: No

- LEACHING TESTS ON WASTE ROCK AND NEW TAILINGS TO DETERMINE POTENTIAL ENVIRONMENTAL
IMPACTS.
RESULTS OF THE TESTS INDICATE THAT THE QUANTITIES OF CONTAMINANTS REMAINING IN THE NEW WASTE
LINGS WERE SIGNIFICANTLY REDUCED. HOWEVER, LEACHATE CONCENTRATIONS WERE GREATER THAN AWQC
SELECTED CONTAMINANTS SUCH AS ZINC.
REPROCESSING WOULD BE A PERMANENT SOLUTION THAT ELIMINATED COLLAPSE OF THE TAILINGS AND WASTE
ROCK PILES. A NEW WASTE TAILINGS IS PRODUCED. LEACHING TESTS SHOW THAT THE NEW TAILINGS CAN BE
DISPOSED IN A MUNICIPAL LANDFILL.
COMPARISON OF ALTERNATIVES
LISTED IN TABLE 2, IN MATRIX FORMAT, ARE THE KEY CRITERIA CONSIDERED IN EVALUATING AND COMPARING
ALTERNATIVES. THESE CRITERIA ARE SPECIFIED IN J. WINSTON PORTER'S MEMORANDUM "ADDITIONAL
INTERIM GUIDANCE FOR FY '87 RECORDS OF DECISION," DATED JULY 21, 1987 AND INCLUDE:
- PROTECTION OF HUMAN HEALTH AND THE ENVIRONMENT
- COMPLIANCE WITH LEGALLY APPLICABLE AND/OR RELEVANT AND APPROPRIATE REQUIREMENTS
- REDUCTION OF MOBILITY, TOXICITY OR VOLUME
- SHORT-TERM EFFECTIVENESS
- LONG-TERM EFFECTIVENESS AND PERMANENCE
- IMPLEMENTABILITY
- COST
• - COMMUNITY ACCEPTANCE
- STATE ACCEPTANCE.
TABLE 2 SUMMARIZES THE DATA DEVELOPED IN THE DETAILED ANALYSIS OF REMEDIAL ACTION ALTERNATIVES
AND PROVIDES A COMPARISON FOR SELECTING A PREFERRED ALTERNATIVE FOR EACH LOCATION. THE
FOLLOWING PARAGRAPHS SUMMARIZE THE EVALUATION CRITERIA FOR ALL SITES.
NO ACTION: AS PREVIOUSLY INDICATED, COLLAPSE WOULD RESULT IN DEGRADATION OF STREAM QUALITY
BELOW AWQC AND MCLS. RUNOFF ALSO DOES NOT MEET AWQC. NO ACTION WOULD NOT REDUCE THE MOBILITY,
TOXICITY OR VOLUME OF THE CONTAMINANTS.
STABILIZATION AND RUNON CONTROLS: DEGRADATION OF STREAM QUALITY DUE TO COLLAPSE WILL BE
ELIMINATED. RUNOFF QUALITY WILL NOT MEET AWQC; HOWEVER, THE VOLUME OF RUNOFF WILL BE REDUCED AS
A RESULT OF RUNON CONTROL. AS A RESULT, CONTAMINATION TO THE STREAM WILL BE REDUCED. OVERALL
MOBILITY OF CONTAMINANTS ARE REDUCED. RELATIVE TO OTHER ALTERNATIVES (EXCEPT NO ACTION), THIS
OPTION HAS THE LOWEST COST. THE REMEDIATION IS NOT A PERMANENT SOLUTION FOR ALL CONTAMINATION
AND DOES NOT ELIMINATE ALL RISKS TO HUMAN HEALTH AND THE ENVIRONMENT.
CAPPING: RUNOFF QUALITY WILL MEET AWQC. CAPPING REDUCES MOBILITY OF CONTAMINANTS. RISKS TO
HUMAN HEALTH DUE TO INHALATION OF DUST AND INGESTION OF MATERIALS ARE ELIMINATED. CAPPING IS A
PERMANENT REMEDIATION THAT REMOVES EXPOSURE TO HUMAN HEALTH AND THE ENVIRONMENT.
OFF-SITE DISPOSAL: OFF-SITE DISPOSAL REDUCES THE MOBILITY AND TOXICITY OF CONTAMINANTS ON THE
SITE. HOWEVER, THE MATERIALS ARE PLACED IN ANOTHER LOCATION AND THE ULTIMATE VOLUME AND
TOXICITY IS NOT REDUCED. EXISTING RISKS TO HUMAN HEALTH AND THE ENVIRONMENT ARE ELIMINATED.
SITE DISPOSAL IS A PERMANENT REMEDY. THE COST FOR OFF-SITE DISPOSAL IS THE SECOND HIGHEST
WTHE SIX ALTERNATIVES EVALUATED.
CHEMICAL FIXATION: RUNOFF QUALITY WILL MEET AWQC FOR MOST PARAMETERS. FIXATION REDUCES MOBILITY
AND POSSIBLY TOXICITY OF THE CONTAMINANTS. HOWEVER, THE VOLUME OF CONTAMINATED MATERIAL IS
INCREASED. FIXATION IS A PERMANENT REMEDY AND ELIMINATES EXISTING RISKS TO HUMAN HEALTH AND