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                          PROJECT EXPERIENCE
                          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
                          AT&T
                          Aventis Pasteur, Inc./Sanofi-Aventis
                          BAE Systems
                          Baker Refractories
                          Black & Veatch Construction
                          BMY
                          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)
                          Playskool
                          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


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