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Draft Final Remedial Investigation / Feasibility Study (Ri/Fs)

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Draft Final Remedial Investigation / Feasibility Study (Ri/Fs) Snperfondi RMQ SITE: DRAFT FINAL PKEAK; REMEDIAL VOLUME 1 OF 4 - TEXT REMEDIAL INVESTIGATION/FEASIBILITY STUDY NEW HAMPSHIRE PLATING COMPANY MERRIMACK, NEW HAMPSHIRE For U.S. Environmental Protection Agency By Halliburton NUS Corporation and Raytheon Engineers & Constructors, Inc. EPA Work Assignment No. 33-1LG1 EPA Contract No. 68-W8-0117 HNUS Project No. 0772 May 1996 Halliburton NTJS CORPORATION W94619DF DRAFT FINAL REMEDIAL INVESTIGATION REPORT VOLUME 1 OF 4 - TEXT REMEDIAL INVESTIGATION/FEASIBILITY STUDY NEW HAMPSHIRE PLATING COMPANY MERRIMACK, NEW HAMPSHIRE For U.S. Environmental Protection Agency By Halliburton NUS Corporation and Raytheon Engineers & Constructors, Inc. EPA Work Assignment No. 33-1LG1 EPA Contract No. 68-W8-0117 HNUS Project No. 0772 May 1996 Marilyn M. Wade, P.E. George D(7Gardner, P.E. Project Manager Program Manager DRAFT FINAL TABLE OF CONTENTS VOLUME 1 - TEXT DRAFT FINAL REMEDIAL INVESTIGATION REPORT NEW HAMPSHIRE PLATING COMPANY SITE MERRIMACK, NEW HAMPSHIRE SECTION PAGE E.O EXECUTIVE SUMMARY ES-1 1.0 INTRODUCTION 1-1 1.1 Site and Study Area Background 1-2 1.2 NHPC Site History 1-3 1.3 Report Organization 1-4 2.0 STUDY AREA INVESTIGATION 2-1 2.1 Previous Investigations 2-1 2.1.1 Peck Environmental Laboratory ,Inc 2-1 2.1.2 Wehran Engineerin g 2-2 2.1.3 New Hampshire Department of Environmental Services (NHDES) 2-3 2.1.4 Removal Actio n- U.S. EPA Emergency Response Team (ERT) 2-4 2.1.5 Wetlan dInvestigation 2-5 2.1.6 Technical Assistance Groundwater Samplin g 2-6 2.1.7 Non-Time-Critical Removal Action 2-7 2.1.8 Previous Investigation son Properties Abutting the NHPC Site 2-9 2.1.8.1 Magnum Leasing and Mortgage Company . 2-9 2.1.8.2 New England Pole and Wood Treating Company 2-9 2.1.8.3 Techwood Building Systems, Inc 2-9 2.1.8.4 Jones Chemical, Inc 2-10 2.2 Study Areas Summary of Existing Information 2-11 2.2.1 NHPC Operations Area 2-11 2.2.1.1 NHPC Building Area 2-12 2.2.1.2 Former Lagoon Areas 2-13 2.2.1.3 Wetlands and Overflow Area 2-16 2.2.1.4 Other On-site Areas 2-17 2.2.2 Adjacent Propertie s 2-18 2.2.2.1 Magnum Leasing and Mortgage Company Property 2-19 2.2.2.2 YMCA Property 2-19 2.2.2.3 Horseshoe Pond Island 2-20 2.2.2.4 New England Pole and Wood Treating Corporation (NEPWTC) 2-20 W94619DF i DRAFT FINAL TABLE OF CONTENTS (Continued) VOLUME 1 - TEXT DRAFT FINAL REMEDIAL INVESTIGATION REPORT NEW HAMPSHIRE PLATING COMPANY SITE MERRIMACK, NEW HAMPSHIRE SECTION PAGE 2.2.2.5 Lot Number 22 Property 2-21 2.2.2.6 Techwood Building Systems Property 2-21 2.2.2.7 Jones Chemical, Inc. Property 2-22 2.2.3 Other Location sof Investigation 2-23 2.2.3.1 Horseshoe Pond 2-24 2.2.3.2 Merrimack River 2-24 2.3 Conceptual Site Model 2-24 2.3.1 Source Areas 2-24 2.3.2 Migration Pathways 2-25 2.4 Objectives of the Rl 2-26 2.5 Summary of Remedial Investigation Activities 2-27 2.5.1 Phas Ie Activities 2-27 2.5.1.1 Surface Soil Sampling Program 2-28 2.5.1.2 Phase I Lagoon Sampling Program 2-29 2.5.2 Phas eII Activities 2-31 2.5.2.1 Building Area Soil Boring Program 2-31 2.5.2.2 Lagoon Soil Boring Program 2-33 2.5.2.3 Monitoring Well Installation Program 2-40 2.5.2.4 Piezometer Installation 2-50 2.5.2.5 Soil Vapor Survey 2-50 2.5.2.6 Elevation and Location Surveys 2-51 2.5.2.7 Water Level Monitoring 2-53 2.5.2.8 Groundwater Sampling Program 2-54 2.5.2.9 Surface Water and Sediment Sampling Program 2-55 2.5.3 Summar yof Remedial Investigation Sampling and Analysis 2-57 2.5.3.1 Data Quality and Data Quality Objectives 2-57 2.6 Studies Performed By Others 2-58 2.6.1 Geophysical Studies Performe bdy United States Geologic Survey (USGS) 2-58 2.6.2 Ecological Studies 2-59 2.6.2.1 EPA Corvallis Laboratory 2-59 2.6.2.2 U.S. Fish and Wildlife Service 2-60 2.6.3 University of Cincinnati Stabilization/Solidification Studies 2-60 2.6.4 Former Building Soil Sampling 2-61 W94619DF DRAFT FINAL TABLE OF CONTENTS (Continued) VOLUME 1 - TEXT DRAFT FINAL REMEDIAL INVESTIGATION REPORT NEW HAMPSHIRE PLATING COMPANY SITE MERRIMACK, NEW HAMPSHIRE SECTION PAGE 3.0 PHYSICAL CHARACTERISTICS OF THE STUDY AREA 3-1 3.1 Surface and Topographic Features 3-1 3.1.1 NHPC Operations Area 3-1 3.1.2 Study Area 3-2 3.2 Demography and Land Use 3-3 3.2.1 Demography 3-3 3.2.2 Land Use 3-4 3.2.3 Groundwater Use 3-5 3.2.4 Surface Water Use 3-5 3.3 Climate 3-6 3.4 Surface Water Hydrology 3-7 3.5 Geology 3-8 3.5.1 Regional Geology 3-9 3.5.2 Study Area Geology 3-10 3.5.2.1 Unconsolidated Soil Deposits 3-10 3.5.2.2 Former Lagoon Areas 3-15 3.5.2.3 Bedrock 3-17 3.6 Hydrogeology 3-19 3.6.1 Shallow Overburden Aquifer 3-21 3.6.1.1 Hydraulic Conductivity 3-21 3.6.1.2 Groundwater Elevation Measurements 3-23 3.6.1.3 Horizontal Hydraulic Gradients 3-24 3.6.1.4 Horizontal Groundwater Flow 3-24 3.6.1.5 Groundwater Flow Rates 3-26 3.6.2 Deep Overburden 3-27 3.6.2.1 Hydraulic Conductivity 3-27 3.6.2.2 Piezometric Surface Elevation Measurements 3-28 3.6.2.3 Horizontal Hydraulic Gradients 3-28 3.6.2.4 Horizontal Groundwater Flow 3-29 3.6.2.5 Groundwater Flow Rates 3-29 3.6.3 Bedrock Aquifer 3-29 3.6.3.1 Hydraulic Conductivity 3-30 3.6.3.2 Piezometric Surface Elevation Measurements 3-30 3.6.3.3 Horizontal Hydraulic Gradients 3-32 3.6.3.4 Horizontal Groundwater Flow 3-33 3.6.4 Former Lagoon Areas 3-33 3.6.4.1 Lagoon Area Hydrology 3-34 3.6.4.2 Observed Groundwater Fluctuations and Depths 3-35 W94619DF iij DRAFT FINAL TABLE OF CONTENTS (Continued) VOLUME 1 - TEXT DRAFT FINAL REMEDIAL INVESTIGATION REPORT NEW HAMPSHIRE PLATING COMPANY SITE MERRIMACK, NEW HAMPSHIRE SECTION PAGE 3.6.5 Groundwater Recharge and Discharge 3-36 3.6.5.1 Upgradient Recharge Areas 3-36 3.6.5.2 Interconnection of Aquifer Systems 3-37 3.6.5.3 Groundwater/Surface Water Interaction .... 3-40 3.7 Ecology 3-42 4.0 SOURCE, NATURE AND EXTENT OF CONTAMINATION 4-1 4.1 Source Areas 4-1 4.1.1 NHPC Building Area 4-1 4.1.1.1 NHPC Building 4-2 4.1.1.2 Former Leachfields 4-3 4.1.1.3 Underground Fuel Oil Storage Tank 4-3 4.1.1.4 Above-ground Solvent Storage Tank 4-4 4.1.1.5 Former NHPC Production Well 4-4 4.1.1.6 Solidified Material Storage Cell 4-5 4.1.2 Former Lagoon Areas 4-5 4.1.3 Wetland and Overflow Areas 4-7 4.1.4 Summary of Source Areas 4-7 4.2 Nature of Chemical Compounds Detected at NHPC 4-9 4.2.1 Metals 4-9 4.2.2 Cyanide 4-10 4.2.3 Volatile Organic Compounds (VOCs) 4-10 4.2.4 Semi-Volatile Organic Compounds (SVOCs) 4-11 4.2.5 Pesticides/Polychlorinated Biphenyls (PCBs) 4-11 4.2.6 Petroleum Hydrocarbons 4-12 4.3 Background/Upgradient Sampling Locations 4-13 4.3.1 Background Soil Sampling 4-13 4.3.1.1 Metals 4-13 4.3.1.2 VOCs 4-15 4.3.1.3 SVOCs 4-15 4.3.1.4 Compounds Analyzed by Not Detected .... 4-15 4.3.2 Upgradient Groundwater Sampling 4-15 4.3.2.1 Metals 4-16 4.3.2.2 VOCs 4-16 4.3.3 Surface Water and Sediment 4-16 4.4 Extent of Contamination in Soils 4-17 4.4.1 Exten otf Soils Contamination in NHPC Building Area , 4-19 4.4.1.1 Metals . 4-20 4.4.1.2 Cyanide 4-27 W94619DF iv DRAFT FINAL TABLE OF CONTENTS (Continued) VOLUME 1 - TEXT DRAFT FINAL REMEDIAL INVESTIGATION REPORT NEW HAMPSHIRE PLATING COMPANY SITE MERRIMACK, NEW HAMPSHIRE SECTION 4.4.1.3 VOCs ........................... 4-28 4.4.1.4 SVOCs .......................... 4-30 4.4.1.5 PCBs ............................ 4-30 4.4.1.6 Total Petroleum Hydrocarbons (TPH) ...... 4-30 4.4.1.7 Compounds Analyzed But Not Detected .... 4-31 4.4.2 Data Presentatio nfor Former Lagoons, Wetlands, and Overflow Area .......................... 4-31 4.4.3 Extent of Soils Contamination in Former Lagoon Areas ................................... 4-33 4.4.3.1 Lagoon 1 Area ..................... 4-34 4.4.3.2 Lagoon 2 Area ..................... 4-41 4.4.3.3 Lagoon 3 and 4 Area ................. 4-49 4.4.3.4 Clean Fill Soil Sample Results ........... 4-57 4.4.4 Exten ot f Soils Contamination in Wetlands and Overflow Area .......................... 4-58 4.4.4.1 Southern Wetland Area ..............
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