Exhibit 99.1

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Anthony E. Manning, Chairman of the Dominion Resources, Inc. Administrative Benefits Committee, certify to the best of my knowledge, that:

1. the Annual Report on Form 11-K of the Thrift Plan of CNG Transmission Corporation and Hope Gas, Inc. for Employees Represented by the United Gas Workers Union, Local 69 - Division II, SEIU, AFL-CIO (the "Plan") for the period ended December 31, 2002 (the "Report") to which this certification is an exhibit, fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m(a) or 78o(d)).
2. the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Plan.

  /s/ Anthony E. Manning                     
Anthony E. Manning
Chairman, Dominion Resources, Inc. Administrative Benefits Committee
June 23, 2003

A signed original of this written statement required by Section 906 has been provided to the Plan and will be retained by the Plan and furnished to the Securities and Exchange Commission or its staff upon request.