1、Designation:D454420Standard Practice forEstimating Peat Deposit Thickness1This standard is issued under the fixed designation D4544;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 ind
2、icates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This practice uses a technique of probing to estimate thethickness of surficial peat deposits overlying mineral soil orbedrock.1.1.1 The resistance to penetration
3、of a pushed or driven rodwill increase sharply at the boundary of a peat layer withunderlying mineral soil or bedrock.When this abrupt change ismeasured in a series of probings with an appropriate spacing,the thickness and areal extent of peat can be defined and thevolume of peat may be calculated.1
4、.2 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.Reporting of test results in units other than SI shallnot be regarded as nonconformance with this standard.1.3 All measured and calculated values shall conform to theguideli
5、nes for significant digits and rounding established inPractice D6026.1.3.1 The procedures used to specify how data are collected/recorded and calculated in the standard are regarded as theindustry standard.In addition,they are representative of thesignificant digits that generally should be retained
6、.The proce-dures used do not consider material variation,purpose forobtaining the data,special purpose studies,or any consider-ations for the users objectives;and it is common practice toincrease or reduce significant digits of reported data to becommensurate with these considerations.It is beyond t
7、he scopeof these test methods to consider significant digits used inanalysis methods for engineering data.1.4 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,healt
8、h,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 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 ju
9、dgment.Not 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
10、 unique aspects.The word“Standard”in thetitle of this document means only that the document has beenapproved through the ASTM consensus process.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on P
11、rinciples for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D653 Terminology Relating to Soil,Rock,and ContainedFluidsD3740 Practice for Minimum Requireme
12、nts for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD4700 Guide for Soil Sampling from the Vadose ZoneD6026 Practice for Using Significant Digits in GeotechnicalData3.Terminology3.1 Definitions:3.1.1 For definitions of common terms used
13、in this standard,refer to Terminology D653.4.Summary of Practice4.1 A graduated,steel rod is aligned vertically over the areaof interest and is then pushed or driven into the peat until therod reaches soil or bedrock.The thickness of the peat layer isthen measured,verified,and recorded.This process
14、is repeatedin different locations covering the area of interest to assist indetermining the thickness and lateral extent of the peat deposit.1This practice is under the jurisdiction of ASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.22 on Media for PlantGrowth
15、.Current edition approved May 1,2020.Published May 2020.Originallyapproved in 1986.Last previous edition approved in 2019 as D4544 19.DOI:10.1520/D4544-20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStan
16、dards 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issue
