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Final Technical Report

Description: OAK-B135 This study took place at the Nevada Desert FACE (Free Air CO2 Enrichment) Facility at the Nevada Test Site, where effects of elevated atmospheric CO2 on a desert ecosystem are being studied. One hundred sixty-eight minirhizotrons (clear plastic tubes) were installed to a depth of 1m in the soil in the control and elevated CO2 plots. Tubes were installed from a suspended platform to avoid soil compaction and disturbance. Tubes were placed under individuals of two dominant shrub species, Larrea tridentata and Ambrosia dumosa, and along systematic transects across the plots. Specialized video cameras were inserted down the tubes at 4 week intervals to provide images of plant root systems on the upper side of the tube. A ratcheting mechanism assured consistent imaging of the same precise locations during each sampling period. Images were collected every 4 weeks from December 1997 to January 2001, after which the images were too degraded from repeated camera abrasion on the tubes for adequate analysis. Over 100,000 video images were analyzed and the appearance, growth, and disappearance of 23,634 individual fine roots (<2 mm diameter) were tracked over time, totaling 125,679 root observations and measurements. Elevated CO2 did not have an effect on the timing of seasonal patterns of fine root growth or turnover (mortality). There were no consistent effects of elevated CO2 on fine root length standing crop, production, or turnover except standing crop was consistently lower under the elevated CO2 treatment across the community transects. The specific root length (m/g of root dry weight) found to be higher for Larrea and Ambrosia under elevated CO2 treatments. Procedures were developed to translate the length measurements taken from minirhizotron images to biomass estimates per unit soil volume, utilizing these specific root length measurements. While few differences in fine root length were apparent as ...
Date: December 18, 2003
Creator: Phillips, Donald L.; Johnson, Mark G. & Tingey, David T.
Partner: UNT Libraries Government Documents Department

The EPA Office of Environmental Justice Small Grants Program

Description: This report is an inventory of the profiles of the Environmental Justice Small Grants awarded for FY 2003. It shows each regions grants awards depending on socioeconomic balance, diversity of recipients, and sustainability of benefits.
Date: October 26, 2004
Creator: United States. Environmental Protection Agency.
Partner: UNT Libraries Government Documents Department

Including Energy Efficiency and Renewable Energy Policies in Electricity Demand Projections

Description: A paper that has a methodology for estimating the energy impacts of key EE/RE on-the-books policies that are not explicitly reflected in the EIA's AEO 2013 electricity projections and including them in their baseline projections.
Date: April 2015
Creator: United States. Environmental Protection Agency.
Partner: UNT Libraries Government Documents Department

Guide to IPM Output Files

Description: A document intended to provide users with a general explanation of the different IPM output files that are made web ready and posted to the EPA's website.
Date: unknown
Creator: United States. Environmental Protection Agency.
Partner: UNT Libraries Government Documents Department

Particle Pollution and Your Health

Description: A pamphlet about particle pollution. It discusses what particle pollution is made of, its risks, avoiding pollution, and how to use the air quality index.
Date: unknown
Creator: United States. Environmental Protection Agency.
Partner: UNT Libraries Government Documents Department

EPA v5.15 Base Case Documentation Supplement to Support EPA's Clean Power Plan

Description: A report that includes details on several modeling assumptions used as part of EPA's analysis of the Clean Power Plan using the EPA v5.15 Base Case using Integrated Planning Model (IPM). Modification include enhancing existing coal steam-fired units to adopt improvements to their heat rates.
Date: unknown
Creator: United States. Environmental Protection Agency.
Partner: UNT Libraries Government Documents Department

State Goals Overview

Description: A presentation that describes the best system of emission reduction for each state in the United States. It explains why different states have different goals.
Date: unknown
Creator: United States. Environmental Protection Agency.
Partner: UNT Libraries Government Documents Department

The Third Unregulated Contaminant Monitoring Rule (UCMR 3)

Description: A paper that provides a dataset that represents the eleventh NCOD release of analytical results for UCMR 3. The Unregulated Contaminant Monitoring Rule (UCMR) program is used by the EPA to collect data for contaminants suspected to be present in drinking water.
Date: July 2016
Creator: United States. Environmental Protection Agency.
Partner: UNT Libraries Government Documents Department

Quickstart Tutorial: How to Use the Co-Benefits Risk Assessment (COBRA) Screening Model: Analytical Steps and Case Studies

Description: A presentation that explains COBRA and how to use it to estimate the air quality, health, and related economic impacts of a scenario. It then explains two case studies about how to apply COBRA in these clean energy scenarios.
Date: June 2015
Creator: United States. Environmental Protection Agency.
Partner: UNT Libraries Government Documents Department

USAID 50 Anniversary

Description: A report about USAID which is a government agency that provides economic, developmental, and humanitarian assistance around the world to support foreign countries. This report provides information about financial results, program performance, and challenges facing USAID.
Date: November 15, 2011
Creator: United States. Environmental Protection Agency.
Partner: UNT Libraries Government Documents Department

Methods for chemical analysis of water and wastes

Description: This manual provides test procedures approved for the monitoring of water supplies, waste discharges, and ambient waters, under the Safe Drinking Water Act, the National Pollutant Discharge Elimination System, and Ambient Monitoring Requirements of Section 106 and 208 of Public Law 92-500. The test methods have been selected to meet the needs of federal legislation and to provide guidance to laboratories engaged in the protection of human health and the aquatic environment.
Date: March 1, 1979
Partner: UNT Libraries Government Documents Department