Random Section of GOST 17.4.4.02-84
2.3. Sample areas shall be marked on the plots with homogeneous soil and land vegetation cover taking into account practical use of soil variety. Sample area shall be described in compliance with the mandatory appendix 2.
2.3.1. To monitor soil contamination level of cultivated lands based on such factors as nature of contamination source, arable crops and landscape at least 1 sample area with size 10´10 m shall be arranged for each 0.5 to 20.0 hectares of the land.
2.3.2. To monitor sanitary state of soils in zones exposed to impact of industrial contamination source, sample areas shall be arranged on the square equal to threefold size of the sanitary protection zone.
2.3.3. To monitor sanitary state of soils on the area of kindergartens, playgrounds, cesspools, garbage cans and other facilities that occupy small area, the size of sample area shall be at least 5´5 m.
3. SOIL SAMPLING
3.1. Point samples shall be taken on the sample area from one or several layers or horizons by “envelope” method, diagonally, or by any other method in such a way that each sample represented an amount of soil, typical for genetic horizons or layers of this soil type. The number of point samples must comply with GOST 17.4.3.01-83.
Point samples shall be taken with the knife or putty spattle from small trenches or using soil samplers.
3.2. A combined sample is a mixture of point samples, taken from one sample area.
3.3. For chemical analysis combined sample shall be made up at least of five point samples, taken from one sample area. Combined sample should weigh at least 1 kg.
To monitor contamination caused by superficially distributed substances – oil, oil products, heavy metals, etc. – point samples shall be taken in a layer by layer manner at the depth of 0-5 and 5-20 cm and shall weigh at least 200 grams each.
To monitor contamination caused by migratory substances point samples shall be taken along genetic horizons all the way down to the soil profile.
3.3.1. When taking point samples and further preparation of the combined sample, it is necessary to avoid their possible recontamination.
Point soil samples intended for heavy metals identification shall be taken with nonmetallic tools. Prior to the point sampling, the trench walls or core surface shall be sloughed off with a polyethylene or polystyrene knife or plastic putty knives.
Point soil samples for volatile chemical substances identification shall be immediately placed into flasks or glass jars with plug-stoppers, full up to the plug.
Point soil samples for pesticides identification should not be placed into polyethylene or plastic containers.
3.4. For bacteriological analysis 10 combined samples are composed from one sample area. Each combined sample is composed of three point samples of 200 — 250 grams each taken in a layer by layer manner at the depth of 0-5 and 5-20 cm.
3.4.1. Soil samples intended for bacteriological analysis, in order to prevent their recontamination, shall be taken with observance of asepsis conditions: using sterile tools, mixing the samples on sterile surface, placing them into sterile containers.
3.5. For helminthological analysis one combined sample shall be taken from each sample area; 200 gram sample shall be composed of ten point samples weighing 20 grams each, taken in a layer by layer manner at the depth of 0-5 and 5-10 cm. If required, the samples shall be taken from deeper soil layers in a layer by layer manner or along genetic horizons.