Testimony issued by the Government Accountability Office with an abstract that begins "Since 1990, GAO has periodically reported on high-risk federal programs that are vulnerable to fraud, waste, and abuse. Two such high-risk areas are managing federal contracts more effectively and assessing the efficiency and effectiveness of federal tax administration. Weaknesses in the tax area continue to expose the federal government to significant losses of tax revenue and increase the burden on compliant taxpayers to fund government activities. Over the last several years, the Senate Permanent Subcommittee on Investigations requested GAO to investigate Department of Defense (DOD), civilian agency, and General Services Administration (GSA) contractors that abused the federal tax system. Based on that work GAO made recommendations to executive agencies including to improve the controls over levying payments to contractors with tax debt--many of which have been implemented--and referred 122 contractors to IRS for further investigation and prosecution. As requested, this testimony will highlight the key findings from prior testimonies and related reports. This testimony will (1) describe the magnitude of tax debt owed by federal contractors, (2) provide examples of federal contractors involved in abusive and potentially criminal activity related to the federal tax system, and (3) describe …

Testimony issued by the Government Accountability Office with an abstract that begins "For many years, GAO has reported that weaknesses in information security are a widespread problem with potentially devastating consequences--such as intrusions by malicious users, compromised networks, and the theft of personally identifiable information. In reports to Congress since 1997, GAO has identified information security as a governmentwide high-risk issue. Concerned by reports of significant vulnerabilities in federal computer systems, Congress passed the Federal Information Security Management Act of 2002 (FISMA), which permanently authorized and strengthened the information security program, evaluation, and reporting requirements for federal agencies. FISMA also defines responsibilities for ensuring centralized compilation and analysis of incidents that threaten information security and providing timely technical assistance in handling security incidents. In this testimony, GAO discusses the continued weaknesses in information security controls at 24 major federal agencies, the reporting and analysis of security incidents, and efforts by the Department of Homeland Security (DHS) to develop a cyber threat analysis and warning capability. GAO based its testimony on its previous work in this area as well as agency and congressional reports."

Testimony issued by the Government Accountability Office with an abstract that begins "DOD's space system acquisitions have experienced problems over the past several decades that have driven up costs by hundreds of millions, even billions of dollars, stretched schedules by years, and increased performance risks. DOD has recognized the need to change its approach to developing space systems and is attempting to instill best practices in new efforts. GAO was asked to testify on its findings on space acquisitions problems and steps needed to sustain and expand the use of best practices. In preparing this testimony, GAO relied on its detailed reviews of space programs as well as cross-cutting work on cost estimating and best practices. GAO does not make recommendations in this testimony. However, GAO has made recommendations on steps DOD can take to ensure better outcomes for its space acquisitions programs. These include developing an overall investment strategy for acquisition programs, addressing human capital and other shortfalls in capacity, and revising policies supporting space to incorporate best practices."

Testimony issued by the Government Accountability Office with an abstract that begins "When GAO originally placed the U.S. Postal Service's (the Service) transformation efforts and long-term outlook on its high-risk list in early 2001, it was to focus urgent attention on the Service's deteriorating financial situation. Aggressive action was needed, particularly in cutting costs, improving productivity, and enhancing financial transparency. GAO testified several times since 2001 that comprehensive postal reform legislation was needed to address the Service's unsustainable business model, which assumed that increasing mail volume would cover rising costs and mitigate rate increases. This outdated model limited its flexibility and incentives needed to realize sufficient cost savings to offset rising costs, declining First-Class Mail volumes, unfunded obligations, and an expanding delivery network. This limitation threatened the Service's ability to achieve its mission of providing affordable, high-quality universal postal services on a self-financing basis. This testimony will focus on (1) why GAO recently removed the Service's transformation efforts and outlook from GAO's high-risk list, (2) the Service's financial condition in fiscal year 2007, (3) the opportunities and challenges facing the Service, and (4) major issues and areas for congressional oversight. This testimony is based on GAO's past work, review of …

Testimony issued by the Government Accountability Office with an abstract that begins "The Commonwelth of the Northern Mariana Islands (CNMI) is a self-governing commonwealth of the United States that administers its own local government functions under its own constitution. CNMI consists of 14 islands in the North Pacific with a total land area about 2.5 times the size of Washington, D.C. In recent years, CNMI has experienced serious economic and fiscal challenges, and several indicators point to a fiscal crisis in fiscal year 2006. This testimony highlights the recent economic trends in the CNMI economy, its weakening fiscal condition, and its financial accountability challenges. Our conclusions are based on work performed for our December 2006 report on U.S. insular areas and our February 2007 testimony on CNMI before the Senate Committee on Energy and Natural Resources, which was updated to include audited financial information through fiscal year 2005 and some recent developments in fiscal year 2006 based on information available as of February 2007. Today, we are also including additional information on CNMI's fiscal year 2006 status recently provided to us by CNMI's Secretary of Finance. We conducted our work in accordance with generally accepted government auditing standards."

Testimony issued by the Government Accountability Office with an abstract that begins "Weather-related events in the United States have caused tens of billions of dollars in damages annually over the past decade. A major portion of these losses is borne by private insurers and by two federal insurance programs-- the Federal Emergency Management Agency's National Flood Insurance Program (NFIP), which insures properties against flooding, and the Department of Agriculture's Federal Crop Insurance Corporation (FCIC), which insures crops against drought or other weather disasters. In this testimony, GAO (1) describes how climate change may affect future weather-related losses, (2) provides information on past insured weather-related losses, and (3) determines what major private insurers and federal insurers are doing to prepare for potential increases in such losses. This testimony is based on a report entitled Climate Change: Financial Risks to Federal and Private Insurers in Coming Decades are Potentially Significant (GAO-07-285) being released today."

Testimony issued by the Government Accountability Office with an abstract that begins "As operations overseas continue, the Department of Defense (DOD) is experiencing a growing demand for intelligence, surveillance, and reconnaissance (ISR) assets to provide valuable information in support of military operations. While the 2006 Quadrennial Review emphasized the need for the ISR community to improve the integration and management of ISR assets, DOD plans to make significant investments in ISR capabilities for the future. Congress has been interested in DOD's approach for managing and integrating existing assets while acquiring new systems. This testimony addresses preliminary observations based on GAO's ongoing work regarding (1) the status of DOD initiatives intended to improve the management and integration of ISR requirements and challenges DOD faces in implementing its initiatives, (2) DOD's approach to managing current ISR assets to support military operations, and (3) the status of selected ISR programs in development and the potential for synergies between them. GAO's ongoing work included document review, interviews with officials at relevant organizations, observations of some U.S. Central Command operations, and review of 12 airborne ISR development programs."

The general goal of this report is to diminish concentrations of metals/radionuclide in groundwaters of contaminated sites to below MCL values through reduction to lower solubility species.

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Effective environmental management of DOE sites requires reliable prediction of reactive transport phenomena. A central issue in prediction of subsurface reactive transport is the impact of multiscale physical, chemical, and biological heterogeneity. Heterogeneity manifests itself through incomplete mixing of reactants at scales below those at which concentrations are explicitly defined (i.e., the numerical grid scale). This results in a mismatch between simulated reaction processes (formulated in terms of average concentrations) and actual processes (controlled by local concentrations). At the field scale, this results in apparent scale-dependence of model parameters and inability to utilize laboratory parameters in field models. Accordingly, most field modeling efforts are restricted to empirical estimation of model parameters by fitting to field observations, which renders extrapolation of model predictions beyond fitted conditions unreliable. The objective of this project is to develop a theoretical and computational framework for (1) connecting models of coupled reactive transport from pore-scale processes to field-scale bioremediation through a hierarchy of models that maintain crucial information from the smaller scales at the larger scales; and (2) quantifying the uncertainty that is introduced by both the upscaling process and uncertainty in physical parameters. One of the challenges of addressing scale-dependent effects of coupled processes in …

The Environmental Molecular Sciences laboratory (EMSL) is a national scientific user facility operated by the Pacific Northwest National Laboratory (PNNL) for the U.S. Department of Energy's Office of Biological and Environmental Research. Located in Richland, Washington, EMSL offers researchers a comprehensive array of cutting-edge capabilities unmatched anywhere else in the world and access to the expertise of over 300 resident users--all at one location. EMSL's resources are available on a peer-reviewed proposal basis and are offered at no cost if research results are shared in the open literature. Researchers are encouraged to submit a proposal centered around one of EMSL's four Science Themes, which represent growing areas of research: (1) Geochemistry/Biogeochemistry and Subsurface Science; (2) Atmospheric Aerosol Chemistry; (3) Biological Interactions and Dynamics; and (4) Science of Interfacial Phenomena. To learn more about EMSL, visit www.emsl.pnl.gov.

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Desulfovibrio vulgaris ATCC 29579 is a well studied sulfate reducer that has known capabilities of reducing heavy metals and radionuclides, like chromium and uranium. Cultures grown in a defined medium (i.e. LS4D) had a lag period of approximately 40 h when exposed to 50 μMof Cr(VI). Substrate analysis revealed that although chromium is reduced within the first 5 h, growth does not resume for another 35 h. During this time, small amounts of lactate are still utilized but the reduction of sulfate does not occur. Sulfate reduction occurs concurrently with the accumulation of acetate approximately 40 h after inoculation, when growth resumes. Similar amounts of hydrogen are produced during this time compared to hydrogen production by cells not exposed to Cr(VI); therefore an accumulation of hydrogen cannot account for the utilization of lactate. There is a significant decrease in the carbohydrate to protein ratio at approximately 25 h, and this result indicated that lactate is not converted to glycogen. Most probable number analysis indicated that cell viability decreased steadily after inoculation and reached approximately 6 x 104 cells/ml 20 h post-chromium exposure. Regeneration of reducing conditions during chromium exposure does not induce growth and in fact may make the growth …

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The primary goal is to develop quantitative model of heterogeneity that incorporates dominant features at the significant scales, and reflects geologic variability; reflects multi-scale nature of stratigraphy; honors core and well log data; and forms basis of conceptual hydrostratigraphic models.

We compare four algorithms from the latest LAPACK 3.1 release for computing eigenpairs of a symmetric tridiagonal matrix. These include QR iteration, bisection and inverse iteration (BI), the Divide-and-Conquer method (DC), and the method of Multiple Relatively Robust Representations (MR). Our evaluation considers speed and accuracy when computing all eigenpairs, and additionally subset computations. Using a variety of carefully selected test problems, our study includes a variety of today's computer architectures. Our conclusions can be summarized as follows. (1) DC and MR are generally much faster than QR and BI on large matrices. (2) MR almost always does the fewest floating point operations, but at a lower MFlop rate than all the other algorithms. (3) The exact performance of MR and DC strongly depends on the matrix at hand. (4) DC and QR are the most accurate algorithms with observed accuracy O({radical}ne). The accuracy of BI and MR is generally O(ne). (5) MR is preferable to BI for subset computations.

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