Environmental Fallout Dust Monitoring Equipment and Devices

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CLIENT's NAME

DUST FALL-OUT MONITORING PROGRAMME

MONTHLY REPORT 13/06 to 17/07/02


1         Introduction

This report covers a 34-day period in June and July 2002, with two cycles for each DustWatch unit being completed.

2         Climatic Conditions

A total of 53.4 mm of rain fell in this period.  This is a lower rainfall than the previous period that had over 110 mm of rain.

DATE

Location 1

Location 2

Location 3

6/12/02

0.0

1.0

0.0

6/13/02

0.0

0.2

0.4

6/15/02

1.2

0.0

3.4

6/16/02

0.0

0.0

0.2

6/17/02

5.5

4.0

4.0

6/18/02

1.7

0.0

1.0

6/22/02

0.0

1.0

0.2

6/23/02

1.8

0.0

0.8

6/26/02

6.5

11.0

9.0

6/27/02

0.0

2.0

0.8

6/28/02

1.5

6.5

4.4

6/29/02

0.0

5.5

4.2

7/8/02

14.0

15.5

7.4

7/9/02

0.0

0.0

0.4

7/14/02

13.2

10.5

12.8

7/15/02

8.0

7.5

5.2

7/22/02

0.0

0.0

0.2

Table 1:  Rainfall data (Bold values are rain within the period)

3         Comments on the result 

The inside units are:

  •         G1

  •         QD!

  •         M1

  •         GC

  •         RWD

  •         CCRD

The outside units are:

  •         WF1

  •         KF1

  •         4SS

The minimum fall-out dust level in this period was 30.446 mg/m2/day, from the north bucket at the SS unit in the 2nd cycle.

The maximum fall-out dust level in this period was 427.717 mg/m2/day, from the south bucket at the CCRD unit in the 2nd cycle.  This is the 2nd period in a row that this unit has yielded the highest result. 
 

S.A. Classification

ASTM equivalent

(mg/m2/day)

German DIN air quality monthly limit (mg/m2/day)

Slight

<

250

650 Non- Industrial limit

Moderate

251

500

Heavy

501

1200

1300 Industrial limit

Very Heavy

>

1200

An action level would be greater than 750 mg/m2/day

 

Table 2:  Legal classification of fall-out dust

Studying the DustWatch units north and west of the plant, we note the following:

  • The import results at the M1 unit were higher than expected, but the export results are both below 300 mg/m2/day.  These levels are in the moderate dust category.

  • The RWD results are all below 160 mg/m2/day

  • The GC unit yielded results all below 150 mg/m2/day.

  • The SS unit yielded an unexpected high result in the 1st cycle, from the north bucket, 215.536 mg/m2/day.  All the other results are below 50 mg/m2/day. 

Looking at the other units, we note the following:

  • The WF unitís results have leveled out at the very low level of between 50 and 110 mg/m2/day.

  • The results from the K1 unit still indicate agricultural activity because of the brown earthy colour of the dust.  The results are all below 400 mg/m2/day.  We note that this is higher than the other units positioned beyond the boundary of the mine, indicating that the farming activities in the area are loading the bucket.

  • The QD results continued to come down with all the results being below 200 mg/m2/day.

  • The results at the G1 unit were very low, all below 115 mg/m2/day, with the exception of the north bucket in the second cycle that yielded 303.753 mg/m2/day.  The north bucket reading in the 2nd cycle is not a concern because it is only in the moderate dust category.

  • The CCRD results were quite consistent with each other, and were all below 430 mg/m2/day.

4         Microscopic analysis

As expected more units indicated high pollen counts during this period, and we recommend that workers, who are sensitive to pollens, consider taking preventative measures.

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