Consolidated Edison Company of New York, Inc. 31 -01 20th Avenue Long Island City NY 11 105-2048 conEdison www.conEd.com ~* a conEdlson, inc cornparly February 16,2007 Mr. Matthew Hubicki Project Manager New York State Department of Environmental Conservation 625 Broadway Albany,N.Y. 12233-7017 RE: Ossining Works Site Revised Site Characterization Work Plan Voluntary Cleanup Agreement Index No. D2-0003-02-08 Site ID V00568 Dear Mr. Hubicki: Enclosed for your review please find the revised Site Characterization Work Plan for the Ossining Works Site. This version of the work plan incorporates the off-site soil borings as per NYSDEC request. If you have any questions or require further information to complete your review, please * contact me at 718-204-4288, or via e-mail at [email protected]. Project Manager cc: M. Ryan, NYSDEC (wlo attach) R. Pergardia, NYSDEC Region 3 M. Rivara, NYSDOH (2 copies) R. Price, Con Ed (wlo encl.) M. Wilcken, Esq. Con Ed (wlo end.) E. Louie, Con Ed (wlo end.) L. Mascuch Con Ed, (wlo encl.) J OTooIe, Con Ed (wlo encl.) Site Characterization Study Work Plan Former Ossining Works Manufactured Gas Plant Ossining, New York Site Identification Number V00568 For Consolidated Edison Company of New York, Inc. 3 1-02 2othAvenue Building 136, Second Floor Long Island City, New York 11 105 Prepared by: SCHOOR DEPALMA Justin Corporate Center 200 State Highway Nine P.O. Box 900 Manalapan, New Jersey 07726-0900 and HDR ( LMS One Blue Hill Plaza Pearl River, New York 10965-3 104 February 16,2007 N:\pro~eclV006\0603419\O I \Oss SCWP\Oss SC WP Trxt\SCWP-Ossin~ng-finaldoc SITE CHARACTERIZATION WORK PLAN FORMER OSSINING WORKS MANUFACTURED GAS PLANT OSSINING. NEW YORK TABLE OF CONTENTS Section SECTION 1 INTRODUCTION .................................................................................................1-1 1. 1 Project Background ......................................................................................................1-1 1.2 Project Objectives ................................ .. ................................................................. 1-2 1.3 Work Plan Organization .............................................................................................. 1-2 SECTION 2 SITE BACKGROUND .......................................................................................... 2-1 2.1 SiteIAdjoining Property Description ............................................................................2-1 2.1.1 Site Location ...........................................................................................................2-1 2.1.2 Site Layout ..............................................................................................................2-1 2.1.3 Surrounding Land Use ...........................................................................................2-2 2.2 Geology/Hydrogeology............................................................................................... 2-3 w 2.3 Site History .................................................................................................................. 2-5 2.3.1 Site Ownership ........................................................................................................2-5 2.3.2 Past Site Operations ................................................................................................2-6 2.4 Environmental Records Search Summary ..................................................................2-8 2.5 Previous Investigations ........................................................................................... 2-9 SECTION 3 SCOPE OF WORK .............................................................................................. 3-1 3.1 Site Environmental Conditions ....................................................................................3-1 3.1.1 Soils ............................... ... .......................................................................................3-1 3.1.2 Vapors .....................................................................................................................3-1 3.1.3 Groundwater............................................................................................................ 3-1 3.1.4 Surface Water .......................................................................................................... 3-1 3.1.5 Sediments ................................................................................................................3-2 3.2 Scope of Work .............................................................................................................3-2 3.2.1 Coordinating Offsite AccessIField MobilizatiodUtility Clearance ........................ 3-3 3.2.2 Air Monitoring ........................................................................................................ 3-4 3.2.3 Soil Borings ............................................................................................................ 3-5 3.2.4 Soil Sampling and Analyses ...................................................................................3-6 SITE CHARACTERIZATION WORK PLAN FORMER OSSINING WORKS MANUFACTURED GAS PLANT OSSINING, NEW YORK TABLE OF CONTENTS 3.2.5 Groundwater Monitoring Wells ............................................................................3-7 3.2.6 Staff Gauge Installation .......................................................................................... 3-9 3.2.7 Site Survey ............................................................................................................ 3-9 3.2.8 Water Level Gauging ..............................................................................................3-9 3.2.9 Groundwater Sampling and Analysis ...................................................................3- 10 3.2.10 Management of Investigation Derived Waste ....................................................... 3-1 1 . 3.2.1 1 Equipment Decontamination.. ..............................................................................3- 1 1 3.2.12 Data Management ................................................................................................3- 12 3.2.13 Summary Report Preparation .............................................................................. 3- 12 SECTION 4 PROJECT MANAGEMENT ................................................................................. 4-1 4.1 Organization.. ...............................................................................................................4- 1 4.2 Schedule ......................................................................................................................-4-1 W SECTION 5 REFERENCES ......................................................................................................5-1 SECTION 6 ACRONYMS AND ABBREVIATIONS ..............................................................6-1 TABLES Table 3-1 Proposed Sample Summary and Objectives FIGURES Figure 1- 1 Site Location Map Figure 1-2 Site Plan Figure 3-1 Proposed Sample Location Map Figure 3-2 Proposed Offsite Soil Borings Locations Figure 4-1 Preliminary Schedule for Site Characterization APPENDICES A Quality Assurance Project Plan B Field Sampling Plan C Health and Safety Plan w D Community Air Monitoring Plan SECTION 1 INTRODUCTION Project Background The Consolidated Edison Company of New York, Inc. (Con Edison) has entered into a Voluntary Cleanup Agreement (VCA) with the New York State Department of Environmental Conservation (NYSDEC) to investigate and, if necessary, remediate potential contamination at the former manufactured gas plant (MGP) property known as the Former Ossining Works MGP site. The site identification number is V00568. The Former Ossining Works MGP site was located in the Village of Ossining, Westchester County, New York. A site location map is included as Figure 1- 1. Figure 1-2 shows the current site layout and the approximate locations of historical MGP structures. According to the Historical Investigation Report (Retec, 2003), the former MGP site is located on modern Tax Block 25, Lots 1 and 2 and Tax Block 15, Lot 20. A review of current tax information indicates that the site also occupies modern Tax Block 25, Lots 3, 4, and 9. The table below summarizes current tax lot information and the reported lot area in square feet (ft2) and acres, for the properties that comprise the site. Address of Owner of Lot Area Lot Area Block Lot Record Record (ft2) (acres) Property Use 15 20 39 Central Con Edison 21,780 0.5 Electric and Gas Utility .. ....................................arage, parking ............................................................. structure Government highway 25 3 Central Village of 25,840 0.59 Government highway .-...g arage, .- - parking... .-................... structure........... The lots on Block 25 are owned by the Village of Ossining and are used by the Village's Department of Public Works. Block 15, Lot 20 is owned by Con Edison and is occupied by an electric substation. The current tax map of the Village of Ossining does not clearly depict the locations of lots 1, 3, 4 Lr, and 9. The approximate locations of the tax lots shown on Figure 1-2 are based on the general property descriptions currently available. This information is provided for general reference L only. No formal boundaries are implied by this information. 1.2 Project Objectives The primary goals of this project are: To confirm the presence or absence of former MGP structure, to the extent practical. To evaluate