How to sampleSoil samples

Soil Contamination Countermeasures Act Object substance ： Heavy metals , PCB ,

Agrochemical , VOC

Act on Special Measures concerning Countermeasures against Dioxins

Object substance ： Dioxins

Japanese law about a soil investigation

Feb.20152

Investigation substance of the soil pollution

Feb.20153

Substances dissolved in

the water mg/L（ ）1)

Substances included in

the soil mg/kg（ ）2)

Cadmium(Cd) 0.01 150

Hexavalent Chromium(Cr+6) 0.05 250

Cyanogen (CN) Nondetection 50

Mercury(Hg) Nondetection 15

Selenium(Se) 0.01 150

Lead(Pb) 0.01 150

Arsenic(As) 0.01 150

Fluorine(F) 0.8 4000

Boron(B) 1 4000

Substance

Standard Value

Heavy metals

Investigation substance of the soil pollution

Feb.20154

VOC Agrochemical , PCBStandard Value Standard Value

Substances dissolved in

the water mg/L（ ）

Substances dissolved in

the water mg/L（ ）1)

Carbon Tetrachloride 0.002 Simazine 0.003

1,2-Dichloroethane 0.004 Thiobencarb 0.02

1,1-Dichloroethylene 0.1 Thiuram 0.006

cis-1,2-Dichloroethylene 0.04 Organic phosphorus(O-P) Nondetection

1,3-Dichloropropene 0.002 PCB Nondetection

Dichloromethane 0.02

Tetrachloroethylene 0.01

1,1,1-Trichloroethane 1

1,1,2-Trichloroethane 0.006

Trichloroethylene 0.03

Benzen 0.01

Substance Substance

Method of producing test solution

Feb.20155

1)Substances dissolved in the water (Heavy metals , PCB , Agrochemical )　　 First, mixing dried soil and distilled water at a rate of 1 to 10　　 Second, shaking it for 6 hours　　 Third, filtering it using 0.45μm membrane filter

2) Substances included in the soil (Heavy metals ) First, mixing dried soil and 0.1N hydrochloric acid at a rate of 3 to 100　　 Second, shaking it for 2 hours 　　 Third, filtering it using 0.45μm membrane filter

Our investigation include;・ Collecting information about a toxic 　　　　　 substance (use, storage, leakage)・ Interviewing from owner and worker of the land・ Researching on the current condition of the land

Land use history investigation

Feb.20156

Land use history investigation

7 Feb.2015

Result of the Land use history investigation

8 Feb.2015

Insertion of the Grid

9 Feb.2015

Grid with the risk of soil pollution

10 Feb.2015

Sampling spots

11 Feb.2015

Sampling methods of the soil

12 Feb.2015

Nothing covered on the surface

0 ～5cm

5 ～50cm

Concrete or Asphalt

0 ～ 5cm

5 ～ 50cm

The surface covered with concrete or asphalt

Case1 The polluted soil exists on the ground surface

Sampling methods of the soil

13 Feb.2015

Case2 The polluted soil exists in the ground

Toxic substance retention tank

50cm under the retention tank

Drain pipe

50cm under the drain pipe

Mixing methods of the soil samples

14 Feb.2015

same weight

10ｍ

30ｍ

Soil + Soil Ａ Ｂ

Mixing by thesame weight

Mixing by the

0 5cm～

5 50cm～

Soil A

Soil B

Sampling methods of the soil(Dioxins)

2014/2/2115

same weight

on the ground surface

5 10～ ｍ

0 5cm～

5 10～ ｍ

Mixing by the

Soil pollution area

16 Feb.2015

Additional sampling spots

17 Feb.2015

Polluted depth investigation

18 Feb.2015

Sampling spots

Clay layer

1.0m

2.0m

3.0m

on the ground surface

Sampling spot in order to determine the polluted depth

Boring core sample

Soil investigation scenery

19 Feb.2015

Surveying Concrete cutter

Soil investigation scenery

20 Feb.2015

Double shovel Boring machine (self-propelled)

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