Fourth Five-Year Review Report for the Malta Rocket Fuel Area Site
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FOURTH FIVE-YEAR REVIEW REPORT MALTA ROCKET FUEL AREA SUPERFUND SITE TOWNS of MALTA and STILLWATER, NEW YORK Prepared by U.S. Environmental Protection Agency Region 2 New York, New York July 2014 Approved by: Date: 3' lot¥• E. Mugdan, Director Emergency and Remedial Response Division 202870 llllllllllllllllllllllllllllllllllll Table of Contents Executive Summary ....................................................................................................................... i Five-Year Review Summary Form ............................................................................................. ii Introduction ................................................................................................................................... 1 Site Chronology ............................................................................................................................. 1 Background ................................................................................................................................... 1 Physical Characteristics ............................................................................................................. 1 Site Geology/Hydrogeology ........................................................................................................ 2 Land and Resource Use .............................................................................................................. 3 History of Contamination ........................................................................................................... 3 Initial Response ........................................................................................................................... 3 Basis for Taking Action ............................................................................................................... 4 Remedial Actions .......................................................................................................................... 5 Remedy Selection ........................................................................................................................ 5 Remedy Implementation .............................................................................................................. 7 Construction Completion ............................................................................................................ 8 System Operations/Operation and Maintenance ........................................................................ 8 Progress Since Last Five-Year Review ....................................................................................... 9 Five-Year Review Process .......................................................................................................... 11 Administrative Components ...................................................................................................... 11 Community Involvement ............................................................................................................ 11 Document Review ...................................................................................................................... 12 Data Review .............................................................................................................................. 12 Site Inspection ........................................................................................................................... 14 Interviews .................................................................................................................................. 14 Institutional Controls Verification ............................................................................................ 15 Technical Assessment ................................................................................................................. 15 Question A: Is the remedy functioning as intended by the decision documents? ..................... 15 Question B: Are the exposure assumptions, toxicity data, cleanup levels and remedial action objectives used at the time of the remedy still valid?................................................................ 16 Question C: Has any other information come to light that could call into question the protectiveness of the remedy? ................................................................................................... 17 Technical Assessment Summary ............................................................................................... 18 Issues, Recommendations and Follow-Up Actions .................................................................. 19 Protectiveness Statements .......................................................................................................... 19 Next Review ................................................................................................................................. 19 Tables ........................................................................................................................................... 20 Table 1: Chronology of Site Events ......................................................................................... 20 Table 2: Remediation Goals for Groundwater ......................................................................... 21 Table 3: Documents, Data, and Information Reviewed ............................................................ 22 Table 4: Issues, Recommendations and Follow-Up Actions ................................................... 23 Figures .......................................................................................................................................... 25 Figure 1: Site Plan ................................................................................................................... 25 Figure 2: Monitoring Well Location Map ............................................................................... 26 Attachments ................................................................................................................................. 27 Attachment 1: Monitoring Well Trend Plots ............................................................................. 27 Executive Summary This is the fourth five-year review for the Malta Rocket Fuel Area Superfund site located in the Towns of Malta and Stillwater, Saratoga County, New York. The purpose of this five-year review is to evaluate information to determine if the remedy is, and will continue to be, protective of human health and the environment. The triggering action for this statutory five-year review was August 2009, the signing date of the previous five-year review report. The assessment of this five-year review is that the implemented remedy is functioning as intended and protects human health and the environment in the short term. Soil contamination has been addressed through the removal of contaminated soil and backfilling with clean soil and the potential impacts of contaminated soil on groundwater have been addressed through the removal of the contaminated source. The groundwater contamination is being addressed through natural attenuation and natural discharge to nearby surface water, followed by volatilization. There are no current risks present at the site in either groundwater or soils and none are expected as long as the institutional and access controls are properly operated, monitored and maintained. In order for the remedy to be protective in the long term, the downgradient edge of the plume should be further characterized, a newly discovered area of buried drums and pails should be investigated for soil and groundwater impacts and future construction should include either the installation of mitigation measures during construction or vapor intrusion sampling and the installation of post- construction mitigation measures, if necessary. i Five-Year Review Summary Form SITE IDENTIFICATION Site Name: Malta Rocket Fuel Area EPA ID: NYD980535124 Region: 2 State: NY City/County: Malta and Stillwater/Saratoga SITE STATUS NPL Status: Final Multiple OUs? Has the site achieved construction completion? No Yes REVIEW STATUS Lead agency: EPA Author name (Federal or State Project Manager): Patricia Simmons Pierre Author affiliation: EPA Review period: 8/28/2009 - 8/27/2014 Date of site inspection: 4/10/2014 Type of review: Statutory Review number: 4 Triggering action date: 8/27/2009 Due date (five years after triggering action date): 8/27/2014 ii ISSUES/RECOMMENDATIONS OU(s) without Issues/Recommendations Identified in the Five-Year Review None Issues and Recommendations Identified in the Five-Year Review Issue Category: Monitoring Issue: An increasing trend in trichloroethylene (TCE) concentrations was observed in monitoring well M-29D and the 2013 sampling data showed a TCE exceedance in monitoring well M-28S. Recommendation: TCE concentrations in monitoring wells M-29D and M- 28S should be more closely monitored, along with the remaining shallow OU-1 and deep aquifer monitoring wells situated along the north-northwest boundary of the Former Test Station property (monitoring wells M-25S, M- 25D, M-28D, M-29S, 4D and 4S), to ensure that contaminant trends do not continue to increase or contaminants migrate beyond the monitoring well network. If continued monitoring suggests persistent contamination along this property boundary and an ongoing increasing trend in contaminant data, then appropriate actions should be considered. Affect Current Affect Future Party Oversight Milestone