Sample preparation methods for four-wipe composite dust wipe samples, used by nine different laboratories accredited under the U.S. Environmental Protection Agency (EPA) National Lead Laboratory Accreditation Program (NLLAP), were evaluated to select two methods most likely to provide the best overall performance among multiple laboratories, based on accuracy, precision and practicality of the methods. The best performing methods involved (1) hot nitric acid/hydrogen peroxide digestion and (2) nitric acid ultrasonication. In a second round of testing, two sets of composite dust wipe samples with known amounts of lead were submitted blind to each of the nine laboratories to be prepared for analysis using these two sample preparation methods. Results showed that both methods are capable of meeting all EPA NLLAP requirements for accuracy (recovery) and precision. The ultrason ication method had superior performance at lower cost.

This book is a primer for those interested in a career in this dynamic, multidisciplinary field as well as a handy reference for practicing consultants. Combining theory and practice advice into a concise, readable format, the book is an accessible introduction to the types of projects you will encounter as an environmental consultant and lays the groundwork for what you’ll need to know in this challenging and rewarding profession. Also available with this book, under the Additional Resources tab, are PowerPoint lectures that correspond with each chapter. New in the Second Edition Covers the latest environmental issues, including emerging contaminants, and the latest technological advances in environmental investigation and remediation New chapters dedicated to vapor intrusion investigation and mitigation and to Brownfields redevelopment and project financing. An expanded chapter describing the staffing, budgeting, and execution of environmental projects. Descriptions of the remediation processes under RCRA and Superfund Descriptions on how each chapter’s subject matter applies to the job of the environmental consultant. Dozens of new figures, photographs, and tables designed to enhance the reader’s understanding of the subject matter. Problems and questions to be used for homework assignments or classroom discussions.