1、Designation:D8408/D8408M21Standard Guide forDevelopment of Long-Term Monitoring Plans for VaporMitigation Systems1This standard is issued under the fixed designation D8408/D8408M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the ye
2、ar of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This guide presents factors to consider when developingLong-Term Monitoring(LTM)Plans for monitoring the per-formance
3、 of both active and passive vapor mitigation systemsin buildings.This guide will also assist in developing appro-priate performance standards to make sure that vapor mitiga-tion systems remain protective of human health.Active andpassive vapor mitigation systems have been used for a numberof years o
4、n contaminated properties where residual volatilecontaminants remain in the ground.This guide discusses avariety of vapor mitigations systems;however,its focus is onthe development of long-term monitoring plans for vapormitigation systems that are designed to remain in place formultiple years.1.2 A
5、LTM Plan provides clear performance goals for avapor mitigation system which help to reduce potential confu-sion and ineffective project management.The LTM Plan alsodefines performance monitoring time frames to efficiently testthe vapor mitigation systems effectiveness without unneces-sary and costl
6、y over-testing.This will also promote consistentmonitoring.Vapor mitigation systems are often installed with-out adequate consideration of the long-term monitoring re-quirements necessary to make sure that they remain protectiveof human health for as long as the system remains in place.This guidance
7、 addresses the requirements of the LTM Plan tomonitor a vapor mitigation systems continued effectiveness.Installation verification that the vapor mitigation system wasinstalled correctly is typically addressed in the RemedialDesign stage of a contaminated Property Management and isnot covered in thi
8、s document.1.3 LTM Plan limitations,constraints and potential sourcesof error are discussed in this standard.This guide does notendorse a mitigation system vendor or testing of vapor miti-gation systems.However,this guide does provide a referencefor the common procedures for testing vapor mitigation
9、 sys-tems and related terms,as appropriate.1.4 UnitsThe values stated in either International System(SI)units or English units are to be regarded separately asstandard.The values stated in each system may not be exactequivalents;therefore,each system shall be used independentlyof the other.Combining
10、 values from the two systems mayresult in nonconformance with the standard.Reporting of testresults in units other than SI shall not be regarded as noncon-formance with this standard.The values given in parenthesesare provided for informational purposes only and are notconsidered standard.1.5 All ob
11、served and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.For purposes of comparing a measured orcalculated value(s)with specified limits,the measured orcalculated value(s)shall be rounded to the nearest decimal ofsignificant digits
12、in the specified limit.1.6 This guide offers an organized collection of informationor a series of options and does not recommend a specific courseof action.This document cannot replace education or experi-ence and should be used in conjunction with professionaljudgment.Not all aspects of this guide
13、may be applicable in allcircumstances.This ASTM standard is not intended to repre-sent or replace the standard of care by which the adequacy ofa given professional service must be judged,nor should thisdocument be applied with consideration of a projects manyunique aspects.The word“Standard”in the t
14、itle of thisdocument means only that the document has been approvedthrough the ASTM consensus process.1.7 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,an
15、d environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for the1This guide is under the juri
16、sdiction ofASTM Committee D18 on Soil and Rockand is the direct responsibility of Subcommittee D18.21 on Groundwater andVadose Zone Investigations.Current edition approved Sept.15,2021.Published October 2021.DOI:10.1520/D8408_D8408M21Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principle
