1、Designation:D6725/D6725M16Standard Practice forDirect Push Installation of Prepacked Screen MonitoringWells in Unconsolidated Aquifers1This standard is issued under the fixed designation D6725/D6725M;the number immediately following the designation indicates theyear of original adoption or,in the ca
2、se of revision,the year 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.Scope*1.1 This practice is based on recognized methods by whichdirect push monitoring wells may be design
3、ed and installed forthe purpose of detecting the presence or absence of acontaminant,and collecting representative groundwater qualitydata.The design standards and installation procedures hereinare applicable to both detection and assessment monitoringprograms for facilities.1.2 The recommended moni
4、toring well design,as presentedin this practice,is based on the assumption that the objective ofthe program is to obtain representative groundwater informa-tion and water quality samples from aquifers.Monitoring wellsconstructed following this practice should produce relativelyturbidity-free samples
5、 for granular aquifer materials rangingfrom gravels to silty sand.1.3 Direct push procedures are not applicable for monitor-ing well installation under all geologic and soil conditions(forexample,installation in bedrock).Other rotary drilling proce-dures are available for penetration of these consol
6、idatedmaterials for well construction purposes(Guide D5092).Additionally,under some geologic conditions it may be appro-priate to install monitoring wells without a filter pack(1,2)2.Guide D6724 may be referred to for additional information onthese and other methods for the direct push installation
7、ofgroundwater monitoring wells.1.4 The values stated in either inch-pound units or SI unitspresented in brackets 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 fro
8、m the two systems may result in non-conformance with the standard.1.5 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026,unless superseded by this standard.1.6 This standard does not purport to address all of thesafety c
9、oncerns,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
10、operations.This document cannot replaceeducation or experience and should be used in conjunctionwith professional judgement.Not all aspects of this practicemay be applicable in all circumstances.This ASTM standard isnot intended to represent or replace the standard of care bywhich the adequacy of a
11、given professional service must bejudged,nor should this document be applied without consid-eration of the projects many unique aspects.The word“Standard”in the title of this document means only that thedocument has been approved through the ASTM consensusprocess.2.Referenced Documents2.1 ASTM Stand
12、ards:3D653 Terminology Relating to Soil,Rock,and ContainedFluidsD1586 Test Method for Penetration Test(SPT)and Split-Barrel Sampling of SoilsD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD4043 Gu
13、ide for Selection of Aquifer Test Method inDetermining Hydraulic Properties by Well TechniquesD4044 Test Method for(Field Procedure)for InstantaneousChange in Head(Slug)Tests for Determining HydraulicProperties of AquifersD4104 Test Method(Analytical Procedure)for DeterminingTransmissivity of Nonlea
14、ky Confined Aquifers by Over-damped Well Response to Instantaneous Change in Head(Slug Tests)D4448 Guide for Sampling Ground-Water Monitoring Wells1This practice is under the jurisdiction of ASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.21 on Groundwater and
15、Vadose Zone Investigations.Current edition approved July 15,2016.Published August 2016.Originallyapproved in 2001.Last previous edition approved in 2010 as D672504(2010).DOI:10.1520/D6725_D6725M-16.2The boldface numbers in parentheses refer to a list of references at the end ofthis standard.3For ref
16、erenced 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 D4750 Test Method for Determining Subsurface LiquidLevels in a Borehole or Monitoring Well(Observat
