DOCSLIB.ORG

Hydrogeology of the Huntington-Smithtown Area Suffolk County, New York

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Hydrogeology of the Huntington-Smithtown Area Suffolk County, New York Hydrogeology of the Huntington-Smithtown area Suffolk County, New York By E. R. LUBKE CONTRIBUTIONS TO THE HYDROLOGY OF THE UNITED STATES GEOLOGICAL SURVEY WATER-SUPPLY PAPER 1669-D Prepared in cooperation with the Suffolk County Board of Supervisors, the Suffolk County Water Authority, and the New York Water Resources Commission UNITED STATES GOVERNMENT PRINTING OFFICE. WASHINGTON : 1964 UNITED STATES DEPARTMENT OF THE INTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY Thomas B. Nolan, Director For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.G. 20402 CONTENTS Page Abstract______________________________________________________ Dl Introduction.. _________________________________________________ 3 Scope and purpose of investigation____________________________ 3 Location and extent of area___________________________________ 3 Previous investigations________________________________________ 3 Acknowledgments _____________________________________________ 5 Well-numbering system._______________________________________ 5 Geography__ ___________________________________________________ 6 Physiography and drainage.._._._-_____-__-___-_-__________-__- 6 Culture._____________________________________________________ 7 Climate.__-__-----__--__---_-_____-__-_--_-___-__________ 8 Geologic formations and their water-bearing character________________ 9 General features_____________________________________________ 9 Bedrock_________-_-______-.__._____.____._...____________ 10 Upper Cretaceous series________________________________________ 11 Raritan formation ________________________________________ 12 Magothy(?) formation.____________________________________ 13 Pliocene(?) series_-_-_-_-_____--____-__-__-_______-_--_-------- 19 Mannetto gravel-_--_--______-_-__------__-_--_-----_---_- 19 Pleistocene series______________________________________________ 20 Undifferentiated deposits of Pleistocene and Pliocene (?) age_ __ 23 Upper Pleistocene deposits________________________________ 25 Recent series________________________________________________ 27 Ground water-._____-__--____-_-_______-______-___-___-____-____ 27 Water-bearing units____-_________-___-___________--__-_----_ 27 Perched ground-water bodies_-___-_--__-_----_---_---------- 28 Shallow aquifer__-_-_.--___.____-___-______--_-____-_-__ 28 Intermediate aquifer.--...-.___-________-__-__-_____-_---__ 33 Deep aquifer__-_____-__-_______-________-_____--_-_-_--_ 36 Recharge.___-___-_-________--_____-_______-_-__--__--_---_--- 40 Movement_ _--_-________-_____________-_--___-_-__-_-_------ 41 Discharge _--_______-________-_____._______-_____-_--_--_-_--- 44 Pumpage_____________________________________________________ 45 Surface water_____________________________________________________ 48 Chemical quality__________________________________________________ 49 Temperature_ _-_-____-__________ _______________________-____--- 52 Contamination. ___________________________________________________ 52 Conclusions_ _ ___________________________________________________ 57 References cited.__________________________________________________ 64 Index._______________________.___-_____._._______________--_-_--- 67 in IV CONTENTS ILLUSTRATIONS [Plates are in pocket] PLATE 1. Well-location map. 2. Geologic map. 3. Contour map of buried Cretaceous surface. 4. Geologic sections. 5. Water-table contour map. 6. Distribution of public supply and industrial pumping. Page FIGURE 1. Index map_________________-_--_-_---__-_______ D4 2. Population trends---_____--_--------_-------------_-_-_- 7 3. Map of clay unit of Smithtown_______.___ __ 22 4. Hydrographs of four wells____________ 31 5. Hydrographs of two wells and monthly precipitation_______ 32 6. Piezometric contour map of intermediate aquifer ____________ 34 7. Hydrogeologic section at South Huntington____-_-_____.__ 36 8. Hydrographs of wells in the shallow and intermediate aquifers. 37 9. Piezometric contour map of deep aquifer __________________ 39 10. Hydraulic profile X-X'. _______________________________ 43 11. Withdrawals from public-supply systems ___________________ 46 12. Map of sites for temperature and chloride determinations__ 53 TABLES Page TABLE 1. Summary of average monthly and annual precipitation at sta­ tions in or adjacent to the Huntington-Smithtown area. _____ D8 2. Summary of the stratigraphy and water-bearing properties of the deposits underlying the Huntington-Smithtown area, Suffolk County, N.Y__-________-_--____----_-----_--------_-_- 16 3. Estimated permeability of water-bearing material in the Mag- othy (?) formation and Pleistocene deposits ________________ 19 4. Summary of average discharge of streams continuously or occa­ sionally gaged by the U.S. Geological Survey in the Hunting­ ton-Smithtown area.. -____-_-__--_--_-----_------_-____ 50 5. Chemical analyses of water from typical wells in the Hunting­ ton-Smithtown area _________-_____-___-_-__-__---_--!___ 50 6. Iron concentration, chloride concentration, hardness in CapOg and variation in pH of ground water in the Huntington- Smithtown area, 1956-59______________________________ 51 7. Records of selected wells in the Huntington-Smithtown area... 60 CONTRIBUTIONS TO THE HYDROLOGY OF THE UNITED STATES HYDROGEOLOGY OF THE HUNTINGTON-SMITHTOWN AREA, SUFFOLK COUNTY, NEW YORK By E. K. LUBKE ABSTRACT This report presents the results of an investigation of the ground-water resources and related geologic environment of the Huntington-Smithtown area, New York, by the U.S. Geological Survey in cooperation with the Suffolk County Board of Supervisors, the Suffolk County Water Authority, and the New York State Water Resources Commission. Fieldwork on the investi­ gation, which is part of an overall program for the continuing appraisal of the ground-water reservoir of Long Island, N.Y., was carried on between November 1957 and May 1959. The Huntington-Smithtown area contains about 153 square miles in north­ western Suffolk County, and the population in 1958 was estimated to be 153,000. The area is in north-central Long Island, which is the partly sub­ merged northeastern extension of the Atlantic Coastal Plain. The chief physiographic features, which are largely of glacial origin, include a belt of headlands and bays along the margin of Long Island Sound, the Harbor Hill end moraine, an intermorainal belt, the Ronkonkoma terminal moraine and related clusters of hills, and a south-sloping glacial outwash plain. All the larger streams, such as the Nissequogue River, Cold Spring Brook, Sunken Meadow Creek, Stony Hollow Run, and Mill Creek, are perennial and are characterized by markedly uniform flow sustained by ground-water dis­ charge. The total runoff of these streams has averaged about 11 billion gallons a year during the period of record. The climate is temperate humid with an annual average precipitation of 49 inches. Since World War II, a large growth in population has taken place in the report area, which is sub­ urban to New York City. Concurrently, many new homes have been constructed and light industries have been established. Agriculture, formerly a major activity, is on the wane with the inroads of suburban development on farmed acreage. In 1960, less than 1,800 acres was farmed. The Huntington-Smithtown area is underlain by 400 to 1,300 feet of uncon- solidated deposits of Cretaceous and Quaternary age resting upon a south­ east-sloping bedrock surface. These deposits constitute the ground-water reservoir. Three distinct aquifers have been recognized in the ground-water reservoir. These are: (1) a shallow aquifer, which mainly includes perme­ able upper Pleistocene deposits, the Magothy(?) formation, and possibly some Pliocene deposits; it lies between the water table and about 50 to 80 feet below sea level and contains water generally under unconfined conditions, Dl D2 CONTRIBUTIONS TO THE HYDROLOGY OF THE UNITED STATES (2) an intermediate aquifer, which extends from about 60 to 100 feet below sea level to 850 feet below sea level in the Pleistocene deposits and in the Magothy(?) formation and which contains water under confined conditions, (3) a deep aquifer, which is mainly composed of the Lloyd sand member of the Raritan formation and which contains water under confined conditions. In 1957, approximately 53 percent of the gross pumpage was from Pleistocene deposits, 44 percent from the Magothy(?) formation, and 3 percent from the. Lloyd sand member.. The average natural recharge to the ground-water reservoir in the Hunt- ington-Smithtown area is estimated to be 147 mgd (million gallons per day). This is equivalent to an average of about 43 percent of the average annual precipitation (49 inches) or 21 inches of water. The remainder of the pre­ cipitation is returned to the atmosphere by evapotranspiration or is lost to the sea by overland runoff. In general, ground-water supplies in substantial quantity and of good qual­ ity can be obtained from wells almost everywhere in the project area, except locally on Lloyd and Eaton Necks. Between 1932 and 1957, average with­ drawals for public supply increased from 1.5 mgd in 1932 to 8.8 mgd in 1957. In addition, about 5.9 mgd was used in 1957 for industrial, institutional, domestic, and agricultural purposes. On Lloyd and Batons Necks, potentialities for ground-water development are limited by a reduced thickness of the ground-water reservoir and the nearness of salt-water bodies, which pose the ever-present threat of contami­ nation. In this regard, Batons Neck is particularly vulnerable,
Load more

Recommended publications
  • 2015 Smithtown Draft Plan
    Town of Smithtown Comprehensive Plan Update VOLUME VIII: Draft Plan Supervisor Patrick R. Vecchio Town Council Thomas J. McCarthy Edward R. Wehrheim Robert J. Creighton Lynne C. Nowick Prepared by Town of Smithtown Planning Department February 2015 2 3 TABLE OF CONTENTS I. Introduction ............................................................................................................................................................................. 5 II. Overall Concept ..................................................................................................................................................................... 7 A. Communities ........................................................................................................................................................................ 8 B. The Local Waterfront Area ................................................................................................................................................ 10 C. The Nissequogue River Corridor ....................................................................................................................................... 10 D. Sustainability ..................................................................................................................................................................... 12 III. Land Use ..............................................................................................................................................................................
    [Show full text]
  • The Long Island Historical Journal
    THE LONG ISLAND HISTORICAL JOURNAL United States Army Barracks at Camp Upton, Yaphank, New York c. 1917 Fall 2003/ Spring 2004 Volume 16, Nos. 1-2 Starting from fish-shape Paumanok where I was born… Walt Whitman Fall 2003/ Spring 2004 Volume 16, Numbers 1-2 Published by the Department of History and The Center for Regional Policy Studies Stony Brook University Copyright 2004 by the Long Island Historical Journal ISSN 0898-7084 All rights reserved Articles appearing in this journal are abstracted and indexed in Historical Abstracts and America: History and Life The editors gratefully acknowledge the support of the Office of the Provost and of the Dean of Social and Behavioral Science, Stony Brook University (SBU). We thank the Center for Excellence and Innovation in Education, SBU, and the Long Island Studies Council for their generous assistance. We appreciate the unstinting cooperation of Ned C. Landsman, Chair, Department of History, SBU, and of past chairpersons Gary J. Marker, Wilbur R. Miller, and Joel T. Rosenthal. The work and support of Ms. Susan Grumet of the SBU History Department has been indispensable. Beginning this year the Center for Regional Policy Studies at SBU became co-publisher of the Long Island Historical Journal. Continued publication would not have been possible without this support. The editors thank Dr. Lee E. Koppelman, Executive Director, and Ms. Edy Jones, Ms. Jennifer Jones, and Ms. Melissa Jones, of the Center’s staff. Special thanks to former editor Marsha Hamilton for the continuous help and guidance she has provided to the new editor. The Long Island Historical Journal is published annually in the spring.
    [Show full text]
  • Record of Decision, Smithtown Groundwater Contamination
    SDMS Document 88331 RECORD OF DECISION i Smithtown Groundwater Contamination Superfund Site Smithtown Suffolk County, New York United States Environmental Protection Agency Region II New York, New York September 2004 500001 DECLARATION FOR THE RECORD OF DECISION SITE NAME AND LOCATION Smithtow'n Groundwater Contamination Site Villages: of Nissequogue, Head of the Harbor and St. James, Suffolk County, New York Superfurid Identification Number: NY0002318889 i STATEMENT OF BASIS AND PURPOSE This decision document presents. the selected remedy for the Smithtow'n Groundwater Contamination Superfund Site (the Site) , which was chosen in accordance with the Comprehensive Environmental Response, Compensation, and Liability Act of 1980, as amended (CERCLA);, and to the extent practicable, the National Oil and Hazardous Substances Pollution Contingency Plan (NCP). This decision document explains the factual and legal basis for selecting the remedy for the Site. The Newi York State Department of Environmental Conservation (NYSDEC)l concurs with the selected remedy. A letter of concurrence from NYSDEC is attached to this document (APPENDIX IV) . i' The information supporting this remedial action decision is contained in the administrative record. .The index for the administrative record is attached to this document (APPENDIX III) . ! ASSESSMENT OF THE SITE The response action selected in this Record of Decision (ROD) is necessary to protect the public health or welfare or the environment from actual or threatened releases of hazardous substancei s into the environment. i' DESCRIPTIO? N OF THE SELECTED REMEDY i. ' The remedial "action described in this document addresses contaminated groundwater at the Smithtown Groundwater Contamination Site. In particular', it addresses residential areas impacted by contaminated groundwater from unidentified upgradient sources.
    [Show full text]
  • Section II the DEVELOPED COAST
    Section II THE DEVELOPED COAST GENERAL DEVELOPMENT AND LAND USE Inventory and Analysis Development History The waterfront of Smithtown has been an important part of the Town’s development history. The Native Americans are thought to have had a settlement along the Nissequogue River and it was the Nissequogue River and the coastal resources of the area that drew Richard Smythe and the early colonists to the area. Until the mid-nineteenth century, when ships were the dominant mode of transportation, Smithtown's waterfront was more important to commerce than it is today. Vessels loaded and unloaded goods at landings near Old Dock Road, the Psychiatric Center Channel, Landing Road, Landing Avenue and Main Street. The Main Street area was especially important because it was the furthest upstream that commercial boats could go. The landing was adjacent to one of the few regionally important highways. West of the river, the highway was a toll road (Jericho Turnpike); to the east it was known as Middle Country Road. In the early 1800's, earthen mill dams and watermills were built on the Nissequogue River creating Phillips Mill Pond and New Mill Pond. Small hamlets developed around these mills. The mills at Phillips Mill Pond were within a few hundred feet of the landing at Jericho Turnpike. The close proximity of the industrial mills to the transportation interface caused this area to develop into the commercial hub of the Town. Although waterborne transportation was important to the early economy, it was probably the lack of a good harbor that caused Smithtown to be less regionally important than Huntington, Northport and Port Jefferson.
    [Show full text]
  • Appendix G – Recreation Facilities Plan
    Appendix G – Recreation Facilities Plan GOVERNOR ALFRED E. SMITH/ SUNKEN MEADOW STATE PARK RECREATION FACILITIES PLAN Prepared for: New York State Office of Parks, Recreation, and Historic Planning Prepared by: Cashin Associates, P.C. Engineering‐Planning‐ Construction Management 1200 Veterans Memorial Highway DECEMBER 2012 GOVERNOR ALFRED E. SMITH/ SUNKEN MEADOW STATE PARK RECREATION FACILITIES PLAN Prepared for: New York State Office of Parks, Recreation, and Historic Planning Prepared by: Cashin Associates, P.C. Engineering‐Planning‐ Construction Management 1200 Veterans Memorial Highway, Hauppauge, NY 11788 (631) 348 ‐ 7600 Gregory T. Greene Director of Environmental Programs Nancy Lenz Landscape Architect, RLA Elizabeth Moskalenko Intern Landscape Architect DECEMBER 2012 TABLE OF CONTENTS EXECUTIVE SUMMARY………………………………………………………………………………………………………………………………………………………………..… Es‐i Description, Purpose, and Guiding Principles………………………………………………………………….……………………………………..…. Es‐i Methodology…………………………………………………………………………………………………………………………………………………………… Es‐ii Summary of Needs and Trends………………………………………………………………………………………………………………………………… Es‐ii Recommendations…………………………………………………………………………………………………………………………………………………… Es‐ii INTRODUCTION………………………………………………………………………………………………………………………………………………………………………………. 1 New York State Master Plan Process…………………………………………………………………………….……………………………………………... 1 SMSP Vision and Goals………………………………………………………………………………………………………………………………………..……….. 2 History of the Park………………………………………………………………………………………………………………………………………………….……. 2 Benefits
    [Show full text]
  • Section Iv the Public Coast
    SECTION IV THE PUBLIC COAST 133 Public Access And Recreation INVENTORY AND ANALYSIS The Smithtown waterfront area is characterized by significant open lands and waters with extensive natural and recreational resources unusual for a large suBurBan town. Smithtown Bay, the Nissequogue River, and Stony Brook HarBor comBined with a network of upland parks afford the residents of Smithtown and the region opportunities for extensive public use and enjoyment of the coast. Almost 50% of the waterfront land area is public parkland, including beaches, boating facilities, and natural parks. PuBlic access to the shoreline of the Long Island Sound is also extensive. Of the 3.3 miles of shoreline in the unincorporated area of the Town, 2.7 miles or 75% are publicly owned and accessiBle. Sunken Meadow State Park has 2.4 miles of frontage. The two Town-owned waterfront parks, the Bluff and Callahan’s Beach, have 0.3 miles of frontage on the Sound. The Town also has three beaches (Short Beach, Long Beach, and SchuBert Beach), comprising 1.5 miles of frontage in the Village of Nissequogue. Concerning the tidal portion of the Nissequogue River, 64% (five miles) of the riverbank is in public ownership. These public lands and waters provide for a wide range of public uses, including swimming, boating of all kinds, fishing and shellfishing, hiking, nature viewing and education, passive enjoyment and other active recreation. This wealth of opportunity relies on: the numerous park holdings of the town, state, and county governments; the town and state responsiBilities under the PuBlic Trust Doctrine33; stewardship of natural resources through regulations, education and volunteer activities; and the provision of commercial recreational services.
    [Show full text]
  • Long Island Sound Enhanced Implementation Plan
    NEW YORK STATE DEPARTMENT OF EVIRONMENTAL CONSERVATION Long Island Sound Enhanced Implementation Plan 4/18/2013 Table of Contents Table of Contents .......................................................................................................................................... 1 New York State Long Island Sound Enhanced Implementation Plan ......................................................... 1 1 Executive Summary .............................................................................................................................. 1 2 Background........................................................................................................................................... 4 2.1 LIS N TMDL .................................................................................................................................... 4 2.1.1 Waste Load Allocation .......................................................................................................... 6 2.1.2 Load Allocation ...................................................................................................................... 6 2.2 Land Use in the New York portion of the LIS Watershed ............................................................. 7 2.2.1 Urban .................................................................................................................................. 10 2.2.2 Agricultural .......................................................................................................................... 11 2.2.3
    [Show full text]
  • Executive Summary Introduction Water Is the Single Most Significant Resource for Which Suffolk County Bears Responsibility
    Executive Summary Introduction Water is the single most significant resource for which Suffolk County bears responsibility. As the impact of Superstorm Sandy underscored, more than at any time in our history, we are obliged to come to terms, in every sense, with the water that surrounds us. Suffolk County’s water quality is at a tipping point. We face an alarming trend in the quality of the water our families drink, compounded by impairment of many bodies of water in which our families play. Moreover, the source of these impairments has demonstrably degraded the wetlands that serve as our last line of natural defense against storm surge. While today our drinking water generally meets quality standards, elevating levels of contaminants raise serious concern. Many of our rivers, estuaries and bays are impaired as result of eutrophication. Nitrogen, which primarily spews from residential septics and cesspools, as well as fertilizer, are the principal culprits that spur hypoxia, harmful algal blooms, diminution of sea and shellfisheries, and degradation of our protective natural infrastructure– wetlands and seagrass beds that act as wave and storm surge buffers 1 2. Sea level rise, which also contributes to marshland degradation, is projected to raise groundwater levels, increasing vulnerability to saltwater infiltration, and further compromising on-site wastewater treatment infrastructure largely composed of cesspools and septic tanks. Perhaps nowhere have we seen the impact of nitrogen pollution in more stark terms than the Great South Bay. At one time, this bay produced more than half the clams eaten in our country. However, over the past quarter-century, the clam harvest in the Great South Bay has fallen by 93 percent, destroying an entire industry which once accounted for 6,000 jobs.
    [Show full text]
  • Kings Park & Smithtown
    Kings Park & Smithtown Downtown Opportunity Analysis March 2017 Acknowledgments Steven Bellone Suffolk County Executive David Flynn, Planning Director Suffolk County Industrial Development Agency Town of Smithtown The Suffolk County Industrial Development Agency (IDA) is a public benefit corporation of the State of New Allyson Murray, Environmental Planner York. The Suffolk IDA was created to actively promote, Town of Smithtown encourage, attract and develop job and recreational opportunities throughout the County. The Suffolk IDA is empowered to provide financial assistance to private entities through tax incentives in order to promote the economic welfare, prosperity and recreational opportu- This effort was funded by the Suffolk nities for residents of the County. County Industrial Development Agency. The work was conducted, written, and The Suffolk County IDA works in synergy with Suf- designed by Regional Plan Association folk County Executive Steven Bellone and the Deputy staff. The work also includes analysis per- County Executive and Commissioner of Suffolk County formed by the Suffolk County Department Economic Development and Planning, Theresa Ward, of Economic Development & Planning and to foster positive economic development within the Town of Smithtown Planning Department, County. and is informed by Vision Long Island’s report on revitalizing Downtown Kings Park. Suffolk County IDA Board of Directors Theresa Ward, Chair Grant Hendricks, Vice Chair Pete Zarcone, Treasurer Anthony Giordano, Secretary Gregory T. Casamento Sondra
    [Show full text]
  • Kings Park & Smithtown: Downtown Opportunity Analysis
    Kings Park & Smithtown: Downtown Opportunity Analysis March 2017 Acknowledgments Steven Bellone Suffolk County Executive David Flynn, Planning Director Suffolk County Industrial Development Agency Town of Smithtown The Suffolk County Industrial Development Agency (IDA) is a public benefit corporation of the State of New Allyson Murray, Environmental Planner York. The Suffolk IDA was created to actively promote, Town of Smithtown encourage, attract and develop job and recreational opportunities throughout the County. The Suffolk IDA is empowered to provide financial assistance to private entities through tax incentives in order to promote the economic welfare, prosperity and recreational opportu- This effort was funded by the Suffolk nities for residents of the County. County Industrial Development Agency. The work was conducted, written, and The Suffolk County IDA works in synergy with Suf- designed by Regional Plan Association folk County Executive Steven Bellone and the Deputy staff. The work also includes analysis per- County Executive and Commissioner of Suffolk County formed by the Suffolk County Department Economic Development and Planning, Joanne Minieri, of Economic Development & Planning and to foster positive economic development within the Town of Smithtown Planning Department, County. and is informed by Vision Long Island’s report on revitalizing Downtown Kings Park. Suffolk County IDA Board of Directors Theresa Ward, Chair Grant Hendricks, Vice Chair Pete Zarcone, Treasurer Anthony Giordano, Secretary Gregory T. Casamento
    [Show full text]
  • The Natural Recolonization of Long Island, New York by the North American River Otter (Lontra Canadensis) June 2019
    The Natural Recolonization of Long Island, New York by the North American River Otter (Lontra canadensis) June 2019 River otters photographed on the Nissequogue River. The one on the right is “periscoping,” a behavior characteristic of this semi-aquatic species. (Joe Kelly photo) Mike Bottini, Wildlife Biologist, Long Island Nature Organization 631-267-5228 [email protected] Funding for the 2018 fieldwork, training workshops and report preparation was provided by: J.Crew John Waddell Group for the East End Town of Southold New York State Department of State under Title 11 of the Environmental Protection Fund This report is dedicated to John de Cuevas (October 6, 1930 – November 29, 2018) An ardent and thoughtful conservationist who supported and encouraged several generations of farmers and environmentalists on eastern Long Island. It was an honor to know him as a friend, neighbor and colleague. ABSTRACT In 2018, an otter latrine survey was conducted to determine changes, if any, in the distribution of river otters (Lontra canadensis) on Long Island, New York, in the decade since the previous survey was completed in 2008, when the natural recolonization of the island by otters was first documented. The 2018 survey documented 77 otter latrines in 26 subwatersheds, up from 22 latrines found in seven subwatersheds in 2008. Seven of the new sites documented in 2018 were also surveyed several times in 2008, with no sign noted in 2008, providing additional evidence that Long Island’s river otter population has expanded over the decade 2008 - 2018. The 2018 survey project included hosting a series of public workshops designed to train interested volunteers to assist in the fieldwork.
    [Show full text]
  • Smithtown Groundwater Contamination Superfund Site
    RECORD OF DECISION Smithtown Groundwater Contamination Superfund Site Smithtown Suffolk County, New York United States Environmental Protection Agency Region I1 New York, New York September 2004 DECLARATION FOR THE RECORD OF DECISION SITE NAME AND LOCATION Smithtown Groundwater Contamination Site Villages of Nissequogue, Head of the Harbor and St. James, Suffolk County, New York Superfund Identification Number: NY0002318889 STATEMENT OF BASIS AND PURPOSE This decision document presents the selected remedy for the Smithtown Groundwater Contamination Superfund Site (the Site), which was chosen in accordance with the Comprehensive Environmental Response, Compensation, and Liability Act of 1980, as amended (CERCLA), and to the extent practicable, the National Oil and Hazardous Substances Pollution Contingency Plan (NCP). This decision document explains the factual and legal basis for selecting the remedy for the Site. The New York State Department of Environmental Conservation (NYSDEC) concurs with the selected remedy. A letter of concurrence from NYSDEC is attached to this document (APPENDIX IV). The information supporting this remedial action decision is contained in the administrative record. The index for the administrative record is attached to this document (APPENDIX 111). ASSESSMENT OF THE SITE The response action selected in this Record of Decision (ROD) is necessary to protect the public health or welfare or the environment from actual or threatened releases of hazardous substances into the environment. DESCRIPTION OF THE SELECTED REMEDY The remedial action described in this document addresses contaminated groundwater at the Smithtown ~roundw'aterContamination Site. In particular, it addresses residential areas impacted by contaminated groundwater from unidentified upgradient sources. This remedial action supplements a removal action undertaken by EPA to address residential wells with chlorinated volatile organic compounds (VOCs),particularly perchloroethylene, which exceeds the federal Maximum Contaminant Levels (MCLs).
    [Show full text]