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Pre-Design Investigation Work Plan Magna Metals State Superfund Site

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Pre-Design Investigation Work Plan Magna Metals State Superfund Site Town of Cortlandt, Westchester County, New York NYSDEC Site Number: 360003 NYSDEC STANDBY ENGINEERING CONTRACT D007625 Work Assignment No. 5 Prepared for: NEW YORK STATE DEPARTMENT OF ENVIRONMENTAL CONSERVATION 625 BROADWAY ALBANY, NEW YORK 12233 Prepared by: Prepared by One Blue Hill Plaza Pearl River, NY 10965 February 2013 TABLE OF CONTENTS 1.0 INTRODUCTION............................................................................................................. 1-1 1.1 Purpose ......................................................................................................................... 1-1 1.2 Site Background .......................................................................................................... 1-1 1.3 Site Geology and Hydrogeology ................................................................................. 1-2 1.4 Nature and Extent of Contamination ........................................................................ 1-2 1.5 Selected Remedy .......................................................................................................... 1-5 2.0 SAMPLING PLAN ........................................................................................................... 2-1 2.1 Sample Location and Frequency ............................................................................... 2-1 2.1.1 AOC-1 – Leach Pit Area ........................................................................................... 2-1 2.1.2 AOC-2 – Upland Area ............................................................................................... 2-2 2.1.3 AOC-3 – Refuse Area................................................................................................ 2-2 2.1.4 AOC-4 – Former Magna Metals Building ................................................................. 2-2 2.1.5 AOC-5 – Freshwater Wetland and Unnamed Tributary ............................................ 2-2 2.1.6 AOC-6 – Off-Site Pond ............................................................................................. 2-3 2.1.7 AOC-7 – Furnace Brook............................................................................................ 2-3 2.2 Background Samples................................................................................................... 2-3 3.0 FIELD ACTIVITIES ........................................................................................................ 3-1 3.1 Access Agreements ...................................................................................................... 3-1 3.2 Field Sampling Activities ............................................................................................ 3-1 3.2.1 Surface Soil Samples ................................................................................................. 3-1 3.2.2 Subsurface Soil Samples ........................................................................................... 3-1 3.2.2.1 Hollow Stem Auger ....................................................................................................... 3-1 3.2.2.2 Direct Push/Probe .......................................................................................................... 3-2 3.2.3 Sediment Samples...................................................................................................... 3-2 3.3 Site Survey ................................................................................................................... 3-3 3.4 Equipment Decontamination ..................................................................................... 3-3 3.5 Field Documentation ................................................................................................... 3-3 3.6 Health and Safety ........................................................................................................ 3-3 3.7 Waste Handling and Disposal .................................................................................... 3-3 Pre-Design Investigation Work Plan TOC-1 3.8 Quality Assurance/Quality Control ........................................................................... 3-4 4.0 REFERENCES .................................................................................................................. 4-1 5.0 LIST OF ACRONYMS AND ABBREVIATIONS ........................................................ 5-1 LIST OF FIGURES Figure 1 Site Location Map Figure 2 Site Map Figure 3 Proposed Sample Locations Figure 4 Proposed Brook Sample Locations LIST OF TABLES Table 1 Summary of Proposed Soil Boring and Sampling Plan LIST OF APPENDICES Appendix A Site Specific Health and Safety Plan Pre-Design Investigation Work Plan TOC-2 1.0 INTRODUCTION Henningson, Durham, & Richardson Architecture and Engineering, P.C. (HDR) has prepared this Pre-Design Investigation (PDI) Work Plan as part of the remedial design (RD) for the Magna Metals State Superfund Site No. 360003 under Superfund Standby Engineer Contract No. D007625, Work Assignment #5. 1.1 Purpose The purpose of the pre-design investigation is to define the limits of the impacted soil in-situ (i.e. pre-excavation) to facilitate design and construction of the remedial action specified in the Record of Decision (ROD) issued in June 2011. Specific objectives of the PDI include: Delineating the extent of impacted soils under the former Magna Metals building; Delineating the horizontal and vertical extent of impacted soils on-site; Delineating the horizontal and vertical extent of impacted soils and sediments off-site; and, Delineating the extent of impacted sediments in Furnace Brook. 1.2 Site Background The Site is a 26 acre parcel located at 510 Furnace Dock Road in the Town of Cortlandt, New York. The property is currently owned by Baker Capital Limited Partnership and has three buildings on-site. Two buildings are currently used as offices, a laboratory and warehouse. The third building is the former Magna Metals building, which is vacant. From 1955 to 1979, the Site was used for metal plating, polishing, and lacquering operations. During operations, liquid waste containing metal and VOC contamination was discharged to a series of leach pits located behind the former Magna Metals building resulting in contamination of on-site and off-site soils and sediments. The southwestern property line borders a freshwater wetland area regulated by the New York State Department of Environmental Conservation (NYSDEC) and an off-site pond. Furnace Brook traverses the Site, approximately 300 feet (ft) west of the former Magna Metals building, flowing south into the wetland area and pond. An unnamed tributary flows southwest along the southern property line from the direction of Furnace Dock Road, and discharges to Furnace Brook in the vicinity of the wetland area and off-site pond. Figure 1 shows the location of the Site in relation to the off-site pond, wetland, unnamed tributary, and Furnace Brook. Topography across the Site ranges from approximately 355 ft above mean sea level (amsl) along the former Magna Metals Building, to 312 ft amsl along the southwestern property line within the wetland area. The former Magna Metals building and leach pit area reside on a hill which slopes steeply down to the wetland area. The height of the slope varies from 12 to 19 ft with an Pre-Design Investigation Work Plan 1-1 approximate gradient of 2 horizontal feet to 1 vertical foot (2H:1V). Stormwater drainage follows site topography and drains west into the unnamed tributary to Furnace Brook and the wetland area. 1.3 Site Geology and Hydrogeology The subsurface soils at the Site and surrounding area consists of a sand to silty sand overburden unit approximately 2 to 18 ft thick, overlying bedrock (Hornblende). Overburden material in the leach pit area is presumed to be fill material placed during the installation of the leach pits. The inferred thickness of the fill material in this area is approximately 7 to 10 ft. The site has overburden and bedrock groundwater units. The overburden groundwater unit is approximately 6 to 16 ft below the ground surface (bgs) and flows to the west toward Furnace Brook. The bedrock groundwater flows in a similar direction. 1.4 Nature and Extent of Contamination A final Remedial Investigation (RI) Report was completed in August 2007 followed by a final Feasibility Study (FS) in November 2010, both prepared by Tetra Tech EC, Inc. The RI as well as previous investigations identified one source area and several impacted media including groundwater, surface water, soil, sediment, and indoor air. Contaminants of concern (COCs) identified during the RI include metals, Volatile Organic Compounds (VOCs) and Semi-Volatile Organic Compounds (SVOCs) analytes including the following: arsenic silver barium zinc cadmium 1,1,2,2-tetrachloroethane chromium dichloroethene (DCE) copper tetrachloroethylene (PCE) cyanides (soluble cyanide salts) trichloroethene (TCE) lead xylene (mixed) mercury benzo(a)pyrene nickel benzo(k)fluoranthene selenium chrysene As per the ROD, silver, barium, cadmium, and polycyclic aromatic hydrocarbons (PAHs) are co- located with the other metals and will be removed as a result of removing soil impacted with metals above the Site Specific Soil Cleanup Objectives (SCOs) identified in the ROD. ROD also identified impacted sediments as those sediments with analytical concentrations above Site Specific Sediment Criteria which was defined as the greater of pre-release/background conditions
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