ASTM_D_5092_-_04_2010e1.pdf

Designation:D509204(Reapproved 2010)1Standard Practice forDesign and Installation of Groundwater Monitoring Wells1This standard is issued under the fixed designation D5092;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEThe units statement in 1.5 was revised editorially in August 2010.1.Scope1.1 This practice describes a methodology for designing andinstalling conventional(screened and filter-packed)groundwa-ter monitoring wells suitable for formations ranging fromunconsolidated aquifers(i.e.,sands and gravels)to granularmaterials having grain-size distributions with up to 50%passing a#200 sieve and as much as 20%clay-sized material(i.e.,silty fine sands with some clay).Formations finer than this(i.e.,silts,clays,silty clays,clayey silts)should not bemonitored using conventional monitoring wells,as representa-tive groundwater samples,free of artifactual turbidity,cannotbe assured using currently available technology.Alternativemonitoring technologies(not described in this practice)shouldbe used in these formations1.2 The recommended monitoring well design and installa-tion procedures presented in this practice are based on theassumption that the objectives of the program are to obtainrepresentative groundwater samples and other representativegroundwater data from a targeted zone of interest in thesubsurface defined by site characterization.1.3 This practice,in combination with proper well develop-ment(D5521),proper groundwater sampling procedures(D4448),and proper well maintenance and rehabilitation(D5978),will permit acquisition of groundwater samples freeof artifactual turbidity,eliminate siltation of wells betweensampling events,and permit acquisition of accurate groundwa-ter levels and hydraulic conductivity test data from the zonescreened by the well.For wells installed in fine-grainedformation materials(up to 50%passing a#200 sieve),it isgenerally necessary to use low-flow purging and samplingtechniques(D6771)in combination with proper well design tocollect turbidity-free samples.1.4 This practice applies primarily to well design andinstallation methods used in drilled boreholes.Other Standards,including Guide D6724 and Practice D6725,cover installationof monitoring wells using direct-push methods.1.5 The values stated in inch-pound units are to be regardedas standard,except as noted below.The values given inparentheses are mathematical conversions to SI units,whichare provided for information only and are not consideredstandard.1.5.1 The gravitational system of inch-pound units is usedwhen dealing with inch-pound units.In this system,the pound(lbf)represents a unit of force(weight),while the unit for massis slugs.1.6 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 and health practices and determine the applica-bility of regulatory limitations prior to use.1.7 This practice offers a set of instructions for performingone or more specific operations.This document cannot replaceeducation or experience and should be used in conjunctionwith professional judgment.Nat all aspects of this practice maybe applicable in all circumstances.This ASTM standard is notintended to represent or replace the standard of care by whichthe adequacy of a given professional service must be judged,nor should this document be applied without consideration ofa projects many unique aspects.The word“Standard”in thetitle of this document means only that the document has beenapproved through the ASTM consensus process.2.Referenced Documents2.1 ASTM Standards:2C150 Specification for Portland CementC294 Descriptive Nomenclature for Constituents of Con-crete AggregatesD421 Practice for Dry Preparation of Soil Samples forParticle-Size Analysis and Determination of Soil Con-stantsD422 Test Method for Particle-Size Analysis of Soils1This practice is under the jurisdiction of ASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.21 on Groundwater andVadose Zone Investigations.Current edition approved Aug.1,2010.Published September 2010.Originallyapproved in 1990.Last previous edition approved in 2004 as D5092041.DOI:10.1520/D5092-04R10E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 D653 Terminology Relating to Soil,Rock,and ContainedFluidsD1452 Practice for Soil Exploration and Sampling by AugerBoringsD1586 Test Method for Penetratio