1.1 This guide presents factors to consider when developing Long-Term Monitoring (LTM) Plans for monitoring the performance of both active and passive vapor mitigation systems in buildings. This guide will also assist in developing appropriate performance standards to make sure that the vapor mitigation system (mitigation system) remains protective of human health. Vapor mitigation systems have been used for a number of years on contaminated properties where residual contamination remains in the ground. 1.2 A LTM Plan provides clear performance goals which help to reduce potential confusion and ineffective project management. The LTM Plan also defines performance monitoring time frames to efficiently test the systems effectiveness without unnecessary and costly over-testing. This will also promote consistent monitoring. Mitigation systems are often installed without adequate consideration of the long-term monitoring requirements necessary to make sure that the mitigation system remains protective of human health for as long as the system remains in place. This guidance addresses the requirements to make sure that a vapor mitigation system remains effective. 1.3 LTM Plan limitations, constraints and potential sources of error are discussed in this standard. This guide does not endorse a mitigation system vendor or testing systems. However, this guide does provide a reference for the common procedures for testing mitigation systems and related terms, as appropriate. 1.4 This guide is organized as follows: Section 2 lists referenced documents. Section 3 defines terminology used in this guide. Section 4 provides a summary of the guide. Section 5 describes the significance and use of this guide. Section 6 describes the LTM Plan Components 1.5 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. Reporting of test results in units other than SI shall not be regarded as nonconformance with this standard. 1.6 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026. For purposes of comparing a measured or calculated value(s) with specified limits, the measured or calculated value(s) shall be rounded to the nearest decimal of significant digits in the specified limit 1.7 This guide offers an organized collection of information or a series of options and does not recommend a specific course of action. This document cannot replace education or experience and should be used in conjunction with professional judgment. Not all aspects of this guide may be applicable in all circumstances. This ASTM standard is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged, nor should this document be applied with consideration of a projects many unique aspects. The word Standard in the title of this document means only that the document has been approved through the ASTM consensus process. 1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health and environmental practices and determine the applicability of regulatory limitations prior to use. 1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
KeywordsVapor intrusion, vapor mitigation, vapor measurements, long-term vapor monitoring, vapor :
Vapor Intrusion (VI) is one of the fastest growing human health risks in America. Short term exposures to Trichloroethene/TCE, for example, have been shown to cause fetal heart defects in the first trimester of pregnancy. VI of chlorinated hydrocarbons like TCE, tetrachloroethene, vinyl chloride, etc., petroleum hydrocarbons like Benzene and other gases like radon and methane currently dominate the environmental consulting market. Vapor mitigation often involves sub-slab depressurization to protect families and businesses. It is critical that a depressurization system establish and maintain a protective vacuum under the entire slab footprint of a building. This standard will address the need to monitor sub-slab negative pressures under the footprint of a building as well other VI mitigation systems to demonstrate over time that the occupants of the building are protected from hazardous vapors and gases entering the building.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
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