Audit report on the Fremont County Landfill Commission for the year ended June 30, 2011

Audit report on the Fremont County Landfill Commission for the year ended June 30, 2011

Detection and Characterization of Preferential Flow Paths in the Downstream Area of a Hazardous Landfill

We have used surface-based electrical resistivity tomography to detect and characterize preferential hydraulic pathways in the immediate downstream area of an abandoned, hazardous landfill. The landfill occupies the void left by a former gravel pit and its base is close to the groundwater table and lacking an engineered barrier. As such, this site is remarkably typical of many small- to medium-sized waste deposits throughout the densely populated and heavily industrialized foreland on both sides of the Alpine arc. Outflows of pollutants lastingly contaminated local drinking water supplies and necessitated a partial remediation in the form of a synthetic cover barrier, which is meant to prevent meteoric water from percolating through the waste before reaching the groundwater table. Any future additional isolation of the landfill in the form of lateral barriers thus requires adequate knowledge of potential preferential hydraulic pathways for outflowing contaminants. Our results, inferred from a suite of tomographically inverted surfaced-based electrical resistivity profiles oriented roughly perpendicular to the local hydraulic gradient, indicate that potential contaminant outflows would predominantly occur along an unexploited lateral extension of the original gravel deposit. This finds its expression as a distinct and laterally continuous high-resistivity anomaly in the resistivity tomograms. This interpretation is ground-truthed through a litholog from a nearby well. Since the probed glacio-fluvial deposits are largely devoid of mineralogical clay, the geometry of hydraulic and electrical pathways across the pore space of a given lithological unit can be assumed to be identical, which allows for an order-of-magnitude estimation of the overall permeability structure. These estimates indicate that the permeability of the imaged extension of the gravel body is at least two to three orders-of-magnitude higher than that of its finer-grained embedding matrix. This corroborates the preeminent role of the high-resistivity anomaly as a potential preferential flow path.

Audit report on the South Dallas County Landfill Agency for the year ended June 30, 2012

Audit report on the South Dallas County Landfill Agency 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 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