ASTM D5092 D5092M-2016 Standard Practice for Design and Installation of Groundwater Monitoring Wells《地下水监测井的设计与安装标准实施规程》.pdf
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1、Designation: D5092 04 (Reapproved 2010)1D5092/D5092M 16Standard Practice forDesign and Installation of Groundwater Monitoring Wells1This standard is issued under the fixed designation D5092;D5092/D5092M; the number immediately following the designation indicatesthe year of original adoption or, in t
2、he case 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 NOTEThe units statement in 1.5 was revised editorially in August 2010.1. Scope Scope*1.1 This p
3、ractice describes a methodology for designing and installing conventional (screened and filter-packed) groundwatermonitoring wells suitable for formations ranging from unconsolidated aquifers (i.e., (that is, sands and gravels) to granularmaterials having grain-size distributions with up to 50 % pas
4、sing a #200 sieve and as much as 20 % clay-sized material (i.e., (thatis, silty fine sands with some clay). Formations finer than this (i.e., (that is, silts, clays, silty clays, clayey silts) should not bemonitored using conventional monitoring wells, as representative groundwater samples, free of
5、artifactual turbidity, cannot beassured using currently available technology. Alternative monitoring technologies (not described in this practice) should be usedin these formationscan be monitored but the well may not yield sufficient water required for sampling, and fine filter pack andscreen requi
6、rements are difficult and costly to install. Use of coarser filter/screens in fine formations will result in wells withunstable filter packs and associated elevated sample turbidity that may adversely affect sample accuracy and data qualityobjectives. This practice is not applicable in fractured or
7、karst rock conditions, but may be applicable for other porous rockformations.1.2 The recommended monitoring well design and installation procedures presented in this practice are based on the assumptionthat the objectives of the program are to obtain representative groundwater samples and other repr
8、esentative groundwater data froma targeted zone of interest in the subsurface defined by site characterization.1.3 This practice, practice when used on coarse grained sand and gravel aquifers, in combination with proper well development(D5521), proper groundwater sampling procedures (D4448), and pro
9、per well maintenance and rehabilitation (D5978), will permitacquisition of groundwater samples free of artifactual turbidity, eliminate siltation of wells between sampling events, and permitacquisition of accurate groundwater levels and hydraulic conductivity test data from the zone screened by the
10、well. For wellsinstalled in fine-grained formation materials (up to 50 % passing a #200 sieve), it is generally necessarymaterials, it is generallynecessary to use much finer pre-packed well screens (6.3.3.2 to use ) and/or employ sampling methods that minimize screen intakeflow velocity, and distur
11、bance of the well column including suspension of settled solids in the well. Using low-flow purging andsampling techniques (D6771) in combination with proper wellor passive sampling devices (D7929 design to collect turbidity-freesamples. ) are two means to minimize the potential sample bias associat
12、ed with turbidity.1.4 This practice applies primarily to well design and installation methods used in drilled boreholes. Other Standards,standards,including Guide D6724 and Practice D6725, cover installation of monitoring wells using direct-push methods.1.5 UnitsThe values stated in either inch-poun
13、d units or SI units presented in brackets are to be regarded as standard, exceptas noted below. The values separately as standard. The values stated in each system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combining values from the two systems may
14、result in non-conformance with thestandard. Equivalent values given in parentheses are mathematical conversions to SI units, which are provided for information onlyand are not considered standard.shown for mix designs and sieves sizes.1.5.1 Sieve Designations (Specification E11) are identified using
15、 the “alternate” system, for example, #40, #200 sieve etc. withnominal opening size in inches and particle sizes in mm. See Specification E11 for standard metric sieve sizes.1.5.2 The gravitational system of inch-pound units is used when dealing with inch-pound units. In this system, the pound (lbf)
16、represents a unit of force (weight), while the unit forWell screen slots are expressed in inches and the metric equivalent is givenin the terminology section and when necessary in the standard (see 3.3.6mass is slugs.).1 This practice is under the jurisdiction of ASTM Committee D18 on Soil and Rock
17、and is the direct responsibility of Subcommittee D18.21 on Groundwater and VadoseZone Investigations.Current edition approved Aug. 1, 2010Nov. 15, 2016. Published September 2010December 2016. Originally approved in 1990. Last previous edition approved in 20042010as D5092D509204(2010)04 11. DOI: 10.1
18、520/D5092-04R10E01.10.1520/D5092_D5092M-16.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, A
19、STM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, P
20、O Box C700, West Conshohocken, PA 19428-2959. United States11.6 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in PracticeD6026, unless superseded by this standard.1.7 This standard does not purport to address all of the safety conc
21、erns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.1.8 This practice offers a set of instructions for performing one or more specific op
22、erations. This document cannot replaceeducation or experience and should be used in conjunction with professional judgment. Nat all aspects of this practice may beapplicable in all circumstances. This ASTM standard is not intended to represent or replace the standard of care by which theadequacy of
23、a given professional service must be judged, nor should this document be applied without consideration of a projectsmany unique aspects. The word “Standard” in the title of this document means only that the document has been approved throughthe ASTM consensus process.2. Referenced Documents2.1 ASTM
24、Standards:2C150 Specification for Portland CementC294 Descriptive Nomenclature for Constituents of Concrete AggregatesD421 Practice for Dry Preparation of Soil Samples for Particle-Size Analysis and Determination of Soil Constants (Withdrawn2016)3D422 Test Method for Particle-Size Analysis of Soils
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