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ASTM D420-2018 pdf free download

ASTM D420-2018 pdf free download,Standard Guide for Site Characterization for Engineering Design and Construction Purposes
1. Scope
1.1 This guide refers to ASTM methods to perform site characterization for engineering, design, and construction pur- poses. The objective of the site characterization should be to identify and locate, both horizontally and vertically, significant soil and rock types and groundwater conditions present within a given site area and to establish the characteristics of the subsurface materials by sampling or in situ testing, or both. 1.2 Laboratory testing of soil, rock, and groundwater samples is specified by otherASTM standards not listed herein. Subsurface exploration for environmental purposes is also outside the scope of this guide. 1.3 Prior to commencement of the site characterization the site should be checked for potentially hazardous or otherwise contaminated materials or cultural/archeological conditions. If evidence of unknown potentially hazardous or otherwise con- taminated materials or conditions are encountered in the course of the site characterization, work shall be interrupted until the circumstances have been evaluated and revised instructions issued. 1.3.1 In addition the location and nature ofunderground and overhead utilities should be identified to ensure that there is no impact to the proposed site characterization. Impacts may include but are not limited to interference with geophysical methods, damaging utilities, creating an unsafe work condition, and limiting accessibility for exploratory equipment.1.4 The values stated in either SI units or inch-pound units are to be regarded as the standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Inch-pound units are provided in brackets for conve- nience. 1.5 This guide offers an organized collection ofinformation or a series of options and does not recommend a specific course of action. This document cannot replace education or experience and shouldbe used in conjunction with professional judgment. Not all aspects ofthis guide may be applicable in all circumstances. This ASTM standard is not intended to repre- sent or replace the standard ofcare by which the adequacy of a given professional service must be judged, nor should this document be applied without consideration ofa project’s many unique aspects. The word“ Standard” in the title of this document means only that the document has been approved through the ASTM consensus process. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.7 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026. 1.8 The procedures used to specify how data are collected/ recorded or calculated, in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The proce- dures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any consider- ations for the user’s objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design. 1.9 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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