The recent years have brought increasing demands on DoD environmental managers to support Underground Storage Tank (UST) program maintenance and compliance. These demands arise in part from the enormous data management requirements associated with the environmental compliance and decision support and in part from the increased environmental awareness in general. A complex fusion of diverse data types and formats is required to support the decision making process stressing the current predominantly manual procedures for data organization, management, retrieval, and processing. In this Phase II proposal, we build on the successful Phase I design and prototype demonstration, to provide a well-integrated, comprehensive, and easy-to-use mapping and data management/retrieval capability for UST program management and compliance support. The proposed GRASS-based system focuses on the requirements of a candidate end-user, Fort Drum, providing interoperability with USACERL for regulatory data dissemination, and interoperability with USATHAMA for compliance management. The proposed system is adaptable to any DoD organization and industry faced with UST regulatory program requirements.