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In gravity injection, small volumes of reagents are gravity-fed into injection well(s) over a longer application period. The distribution and dissipation of the reagents in the saturated zone is largely controlled by the site hydrogeologic conditions. The gravity injection approach may reduce some of risks associated with chemical oxidation technologies. Additionally, given its prolonged application period, the oxidants may be able to penetrate into more of the lower permeability soils to address contaminants in these areas. In both cases, multiple injection events, separated by extended periods of groundwater monitoring, may be required in order to approach cleanup objectives. Establishing which injection or application approach. | United States Environmental Protection Agency Office of Air Quality Planning and Standards Research Triangle Park NC 27711 EPA-453 R-99-003 July 1999 http www.epa.gov ttn uatw 183e aim aimpg.html Air 2 EPA SMALL ENTITY COMPLIANCE GUIDE National Volatile Organic Compound Emission Standards for Architectural Coatings Small Entity Compliance Guide Disclaimer This guide was prepared pursuant to section 212 of the Small Business Regulatory Enforcement Act of 1996 SBREFA Public Law 104-121. This guide is intended solely to help regulated entities comply with the published national regulation National Volatile Organic Compound Emission Standards for Architectural Coatings Federal Register Vol. 63 No. 176 pages 48848 - 48887 September 11 1998 included here in Appendix A . Technical corrections were published on June 30 1999 Federal Register Vol. 64 No. 125 pages 34997-35002 included here in Appendix A. This guide is not intended to replace the regulation and corrections and may not cover all parts of the regulation and corrections. Final authority rests solely with the regulation and corrections to the regulation. However in any civil or administrative action against a small business small government or small non-profit organization for a violation of the architectural coatings regulation the content of this guide may be considered as evidence of the reasonableness or appropriateness of proposed fines penalties or damages. Acknowledgments This document was prepared by the Office of Air Quality Planning and Standards OAQPS U.S. Environmental Protection Agency and approved for publication. This document was provided for review to State Small Business Assistance Programs the Small Business Administration the National Paint and Coatings Association and a number of small business owners. 2 Small Entity Compliance Guide CONTENTS Section 1.0 INTRODUCTION. 7 1.1 Who should use this guide . 8 1.2 What does the guide cover . 8 1.3 How do I use the guide . 9 1.4 How do I obtain a .
