摘要:

AbstractThe risks associated with environmental remediation projects are of concern to engineers, consultants, contractors, owners, and the public. The cost, scheduling, and other uncertainties inherent in performance of construction at sites contaminated by hazardous substances dictate caution with respect to contract terms. Further, the possibility that conditions will be exacerbated by the work, or the public or workers exposed to on‐site substances, makes remediation projects of particular concern to those who will be held accountable for the effects and impacts of such substances.This article discusses particularly important contractual issues and suggests approaches for liability allocation and incentives. Practical, effective, realistic approaches to management of environmental remediation are presented, including the form of contract utilized, negotiated terms, attention to contractor selection and management, and the parties' relative economic strengt

ISSN:1051-5658    

DOI:10.1002/rem.3440030102

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

摘要:

AbstractThis article describes regulatory issues and emission control equipment for air toxics applications. A brief history of air quality legislation is provided, illustrating the difficulty government has had in implementing air quality statutes; this has contributed to the complexity of air quality regulations. Evaluation methodologies are described for three different emission control technologies: thermal oxidation, catalytic oxidation, and adsorption. Brief case histories are provided that describe the pitfalls and benefits associated with each technology. The benefits of integrating health risk assessment into an air quality program are also discussed.

ISSN:1051-5658    

DOI:10.1002/rem.3440030103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

摘要:

AbstractGroundwater at a Superfund site in west Texas has been found to contain chromium at concentrations exceeding EPA's drinking water standard of .05 mg/l. Alternative treatment methods for this site were investigated; this article presents the evaluation of a physicochemical treatment system, in which removal of total chromium to levels below the drinking water standard was achieved through reduction of hexavalent chromium and subsequent removal by coprecipitation with iron. Costs for the construction of the pilot and full‐scale systems are also discusse

ISSN:1051-5658    

DOI:10.1002/rem.3440030104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

摘要:

AbstractThe use of soil washing to remove petroleum hydrocarbon contamination from the soil matrix is becoming more widely used. When viewed as a volume reduction tool, this technology shows some promise. However, ongoing research and treatability studies indicate that without further treatment, even larger‐sized soil fractions (sands and cobbles) may retain hydrocarbon contamination at levels that require further cleaning prior to permanent disposal or reuse. The perception has been that by removing the sand from the soil matrix, thus achieving a 30 percent to 60 percent volume reduction, expensive post‐washing treatment or approved disposal of the finer materials (silts and clays) would be cost‐effective. There exists evidence to the contrary, however. Hydrocarbon retention after soil washing may be influenced by a number of factors unrelated to particle size. Soil characteristics that may play a role include soil humic acids, metal oxide coatings, geologic origin of the soil particles, and clay type. In this article the authors describe a laboratory study designed to evaluate the “cleanability” of

ISSN:1051-5658    

DOI:10.1002/rem.3440030105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

摘要:

AbstractAlthough standard methods of monitoring the progress of in‐situ remediation may provide general results for the most permeable zones affected by soil vapor extraction or bioventing, they are essentially unsuccessful at providing information on the degree of heterogeneity within the remediation zone and on the existence of “hot spots.” Data are presented that suggest that monitoring the concentrations of fixed and biogenic gases and measuring soil permeability on a small‐scale basis may circumvent the common problems associated with assessing the progress of in‐situ remediation. The costs of these monitoring techniques are minor compared to those of designing and operating an in‐situ remediation system, and may save additional time and costs by identifying problem areas early in the clea

ISSN:1051-5658    

DOI:10.1002/rem.3440030106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

摘要:

AbstractAn in‐situ bioremediation project has been designed and constructed for a site in south‐central Kansas just north of Wichita. A pipeline leaked an unknown quantity of refinedfuels in the 1970s. The spill was undetected until hydrocarbons were found in a nearby municipal water supply well. Of concern, from a regulatory perspective, are the alkylbenzene components found in the groundwater, including benzene, toluene, ethylbenzene, and xylene (BTEX). Initial abatement procedures, including free product removal and pumping, had become ineffective. In‐situ bioremediation was selected to complete the restoration process.The project emphasizes the need for a strong understanding of the geologic and hydrogeologic conditions prevalent under the site. Site studies were conducted to determine the distribution and mass of the contaminant and the hydraulic regime. Laboratory microbial studies were used to determine the efficacy of nitrate as a primary electron acceptor. Information from site studies was used to design a treatment system tailored to the requirements of the site. The treatment system is designed to deliver the maximum amount of nutrient‐enriched water to the contaminated zone while maintaining hydraulic control of t

ISSN:1051-5658    

DOI:10.1002/rem.3440030107

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

摘要:

AbstractTen case studies of Superfund sites were done by the University of Tennessee's Waste Management Research and Education Institute. The case studies, which focused on stakeholder perspectives of site processes, revealed a number of problems with the Superfund process. They also revealed that some improvements had begun to take place. Recently, several modifications have been instituted in the Superfund program. Although it is too early to determine their efficacy, it appears that the Superfund program is beaded in the right direction.

ISSN:1051-5658    

DOI:10.1002/rem.3440030108

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

ISSN:1051-5658    

DOI:10.1002/rem.3440030109

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

ISSN:1051-5658    

DOI:10.1002/rem.3440030112

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY

ISSN:1051-5658    

DOI:10.1002/rem.3440030113

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1992

数据来源: WILEY