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              PRIVATE CLIENTS

              Abel Construction Co., Inc.
              ACCO Chain & Lifting Products Division
              ADI Systems, Inc.
              Advance Tank & Construction Company
              Ahlstrom Paper
              Allied-Signal Aerospace Company
              Ameresco Delaware Energy, LLC
              AMZ Manufacturing Company
              Aqua Pennsylvania, Inc.
              Artesian Water Company
              Armstrong Service, Inc.
              Armstrong World Industries, Inc.
              Aspen Systems
              Aventis Pasteur, Inc./Sanofi-Aventis
              BAE Systems
              Baker Refractories
              Black & Veatch Construction
              Bulova Technologies, LLC
              Burle Industries, Inc.
              Cabot Performance Materials
              Caldwell Tanks, Inc.
              CB&I Constructors, Inc.
              CGA Law Firm
              Church & Dwight Company, Inc.
              C-P Converters, Inc.
              Chef Francisco of PA, Inc.
              Chesapeake Finished Metals, Inc.
              Chicago Bridge & Iron Company
              College Hill Poultry
              Columbia Gas Company
              Columbia Water Company
              Congoleum Corporation
              Constellation Energy Source
              Cumberland Valley School District
              Drees Homes
              Dreyer’s Grand Ice Cream
              Dryden Oil Company
              ECS Mid-Atlantic LLC
              Edgecomb Metals
              Exelon Power
              Fairchild Semiconductor
              Faison-Dunkirk, LLC
              Fisher Tank Company
              Gas Technology Products
              General Dynamics
              General Electric Company
              Glatfelter Paper
              Graham Architectural
              GROWMARK FS, LLC
              Harris Corporation Semiconductor Products Division
              Harrisburg International Airport
              Heinz U.S.A.
              Hervitz Meat Packing Plant
              Helena Chemical Company
              Hershey Farm, Inc.
              Hershey Foods
              Hewlett-Packard Co.
              Homestead Mobile Home Estate
              Intersil Corporation
              JHG Contractors, Inc.
              Keystone Potato Products

              Kinsley Construction

              Kodak Processing Labs
              L&S Sweeteners
              Logos Academy
              Lucent Technologies
              Maryland Environmental Service
              McCormick & Co., Inc.
              McNaughton Homes
              Merck & Company, Inc.
              Millennium Inorganic Chemical
              Milton Hershey School

              National Security Agency
              NGK Metals Corporation
              Norfolk Southern Corporation
              Northrop Grumman Systems Company
              Occidental Chemical Corporation
              Osram Sylvania
              Penn National Gaming, Inc.
              Penn State Investment Group
              Pennsy Supply
              Pennsylvania American Water Company
              P.H. Glatfelter Company
              Pitt-DesMoines, Inc. (PDM)
              Precoat Metals
              Record Club of America
              Republic Services, Inc.
              Richmar Builders, Inc.
              Roaring Creek Water Company
              Rohm and Haas Company
              Rutgers Organics Corporation
              SCS Engineers, PC
              Shire Pharmaceuticals
              SKF USA, Inc.
              Solar Power Industries, Inc.
              Spring Glen Fresh Foods
              Sun Chemical
              Sunoco, Inc.
              Susquehanna Pfaltzgraff Company
              Sweetheart Cup Company, Inc.
              Sybron Chemicals, Inc.
              The York Water Company
              Thomson Consumer Electronics
              The Gettysburg Foundation
              Tidewater Utilities
              Titanium Wire Corporation

              Triple Crown Corporation
              UGI Utilities, Inc.
              United Defense Limited Partners
              United Water PA, Inc.
              Universal Foods Corporation
              U.S. Filter
              Washington Metropolitan Area Transit Authority
              Waste Management, Inc.
              Waste Management of Pennsylvania
              White Marsh Environmental
              Whitmoyer Labs
              Worthington Steel