Audit report on the Page County Landfill Association for the year ended June 30, 2012

Audit report on the Page County Landfill Association for the year ended June 30, 2012

Audit report on the Fremont County Landfill Commission for the year ended June 30, 2012

Audit report on the Fremont County Landfill Commission for the year ended June 30, 2012

Audit report on the South Dallas County Landfill Agency for the year ended June 30, 2013

Audit report on the South Dallas County Landfill Agency for the year ended June 30, 2013

Audit report on the Page County Landfill Association for the year ended June 30, 2013

Audit report on the Page County Landfill Association for the year ended June 30, 2013

Audit report on the Fremont County Landfill Commission for the year ended June 30, 2013

Audit report on the Fremont County Landfill Commission for the year ended June 30, 2013

Audit report on the South Dallas County Landfill Agency for the year ended June 30, 2014

Audit report on the South Dallas County Landfill Agency for the year ended June 30, 2014

Audit report on the Page County Landfill Association for the year ended June 30, 2014

Audit report on the Page County Landfill Association for the year ended June 30, 2014

Audit report on the Fremont County Landfill Commission for the year ended June 30, 2014

Audit report on the Fremont County Landfill Commission for the year ended June 30, 2014

Audit report on the South Dallas County Landfill Agency for the year ended June 30, 2015

Audit report on the South Dallas County Landfill Agency for the year ended June 30, 2015

Health consultation : Des Moines (Ex) Ordnance Site Landfill and Lagoon Complex Prairie Trail Development Site [Ankeny] (2012)

The Prairie Trail Development Area is located in the southern portion of Ankeny, Iowa. This development area is located in an area that was formally occupied by the Des Moines Ordnance Plant. The Des Moines Ordnance Plant was constructed for the production and testing of small arms munitions for use during World War II. The Landfill and Lagoon Complex was utilized for disposal of wastes from the ordnance plant and also from various entities that utilized the site property until 1991. The United States Environmental Protection Agency (EPA) is verseeing the cleanup of the Landfill and Lagoon Complex. A portion of the remainder of the site property had been used for burning of scrap explosives, the storage and disposal of chemicals, a disposal pond, testing of products, and various munitions manufacturing activities. The Iowa Department of Natural Resources (IDNR) is overseeing the cleanup of this remaining portion of the site property. The Iowa Department of Public Health has been contacted by residents within the Prairie Trail Development Area and by individuals that have an interest in relocating to the Prairie Trail Development Area. These residents are concerned with any environmental contamination that will be left after site remedial activities are completed. These residents want to know if any remaining environmental contamination will adversely impact their health or the health of their families.

Health consultation : Red Oak Landfill, Red Oak, Montgomery County, Iowa EPA facility ID: IAD980632509 (2005)

Landfill site from the National Priorities List (NPL). The EPA is inviting public comment on the proposed de-listing of the site from the NPL. The Iowa Department of Public Health in cooperation with the Agency for Toxic Substances and Disease Registry (ATSDR) prepared this health consultation to review the current status of the Red Oak Landfill site and to provide an evaluation of any public health consequences of de-listing the site. The information in this health consultation was current at the time of writing. Data that emerges later could alter this document’s conclusions and recommendations.

Audit report on the Page County Landfill Association for the year ended June 30, 2015

Audit report on the Page County Landfill Association for the year ended June 30, 2015

Letter health consultation : Doty Landfill site, Camanche, Iowa EPA Facility ID: IAD980497556 (2008)

The Doty Landfill encompasses 13 acres of land and is located in the southeastern quarter of Section 29, Township 81 North, Range 6 East, Clinton County, Iowa. The site was used as a landfill for municipal solid waste from 1970 to 1975. In addition, local residents have expressed concern that other chemical-or pesticide waste had been disposed at the site. Previous site investigations had been completed in 1992 and in 2005. In October 2007 water samples from private wells located in the vicinity of the Doty Landfill site were collected and analyzed for dissolved metals. Two of the water samples obtained from drinking water wells contained dissolved arsenic above the US EPA Maximum Contaminant Level (MCL) for arsenic of 10 μg/L (micrograms per liter) or 10 ppb (parts per billion). The water samples in question contained dissolved arsenic at concentrations of 19.3 and 14.9 μg/L or 19.3 and 14.9 ppb.

Development of a hepatocyte hollow fiber bioreactor for the study of contrast agents by magnetic resonance imaging

Thanks to the continuous progress made in recent years, medical imaging has become an important tool in the diagnosis of various pathologies. In particular, magnetic resonance imaging (MRI) permits to obtain images with a remarkably high resolution without the use of ionizing radiation and is consequently widely applied for a broad range of conditions in all parts of the body. Contrast agents are used in MRI to improve tissue discrimination. Different categories of contrast agents are clinically available, the most widely used being gadolinium chelates. One can distinguish between extracellular gadolinium chelates such as Gd-DTPA, and hepatobiliary gadolinium chelates such as Gd-BOPTA. The latter are able to enter hepatocytes from where they are partially excreted into the bile to an extent dependent on the contrast agent and animal species. Due to this property, hepatobiliary contrast agents are particularly interesting for the MRI of the liver. Actually, a change in signal intensity can result from a change in transport functions signaling the presence of impaired hepatocytes, e.g. in the case of focal (like cancer) or diffuse (like cirrhosis) liver diseases. Although the excretion mechanism into the bile is well known, the uptake mechanisms of hepatobiliary contrast agents into hepatocytes are still not completely understood and several hypotheses have been proposed. As a good knowledge of these transport mechanisms is required to allow an efficient diagnosis by MRI of the functional state of the liver, more fundamental research is needed and an efficient MRI compatible in vitro model would be an asset. So far, most data concerning these transport mechanisms have been obtained by MRI with in vivo models or by a method of detection other than MRI with cellular or sub-cellular models. Actually, no in vitro model is currently available for the study and quantification of contrast agents by MRI notably because high cellular densities are needed to allow detection, and no metallic devices can be used inside the magnet room, which is incompatible with most tissue or cell cultures that require controlled temperature and oxygenation. The aim of this thesis is thus to develop an MRI compatible in vitro cellular model to study the transport of hepatobiliary contrast agents, in particular Gd-BOPTA, into hepatocytes directly by MRI. A better understanding of this transport and especially of its modification in case of hepatic disorder could permit in a second step to extrapolate this knowledge to humans and to use the kinetics of hepatobiliary contrast agents as a tool for the diagnosis of hepatic diseases.

Sustainable Waste-to-Energy Production: Performance Evaluation of Distributed Generation fuelled by Landfill Gas

The environmental impact of landfill is a growing concern in waste management practices. Thus, assessing the effectiveness of the solutions implemented to alter the issue is of importance. The objectives of the study were to provide an insight of landfill advantages, and to consolidate landfill gas importance among others alternative fuels. Finally, a case study examining the performances of energy production from a land disposal at Ylivieska was carried out to ascertain the viability of waste to energy project. Both qualitative and quantitative methods were applied. The study was conducted in two parts; the first was the review of literatures focused on landfill gas developments. Specific considerations were the conception of mechanism governing the variability of gas production and the investigation of mathematical models often used in landfill gas modeling. Furthermore, the analysis of two main distributed generation technologies used to generate energy from landfill was carried out. The review of literature revealed a high influence of waste segregation and high level of moisture content for waste stabilization process. It was found that the enhancement in accuracy for forecasting gas rate generation can be done with both mathematical modeling and field test measurements. The result of the case study mainly indicated the close dependence of the power output with the landfill gas quality and the fuel inlet pressure.