Document: NRC Regulatory Guide
Document ID: 688895c2-d1d9-44f3-9c79-3cf0daa88510
Document Type: regulatory_guide
Title: 
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML0037/ML003739541.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.5
CFR Part: 
CFR Title: 

Content:
hould be recorded, as well as the area and depth sampled. to provide information necessary to also calculate and express contaminant activity per unit area. fIt. Disecuion Both the HASL and Nevad Test Site procedures are intended to provide deposition and/or concentration data that are typical of a given area, and are thus based on criteria for obtaining samples that are most representative of that area. It is probable, however, that at some koitions of nuclear facilities, these guides canot be entirely met due to the special nature of t1e terrai. In such instances, each site should be handled on a cme-by-cse basis. For example, if the facility site does not have suitable sampling areas, i.e., large flat open areas covered with grass, a greater number of soil cores should be taken for compositing than from a more suitable area. Using the HASL criterion of ten cores per sample from a good site as a base, a less suitable site may require sampling and compositing of 15 or more cores to obtain a reasonably representati* sample. In areas where the ground is covered with tall grass. it may be necessary to separately sample the grass and 4.5-5 soil. One method for doing this is to measure off a minimum of one meter square of Vpound and to collect Ihc hrao within this area by cropphng it to about a Ow,-cm hei•ht. The soil within this area could then he sampled by taking five plugs and core (one taken at etnch vitinor and one taken in the center) using the HASI. ",'re method described In this apWrnx. Two of these one-meter.quare plots which are spaced at least ten feet apart should provide the recessary number of plugs and uores needed for compodting. The $rats could be analyzed separately or added to the soil and analyzed together with the soil. If the latter technique is used, it would he necessary to process the grass first by grinding and/or ashing and then adding a proportionate aliquot of the rass to the soil. Since the primary objective of soil analysis is to obtain