ISPRS, Vol.34, Part 2W2, “Dynamic and Multi-Dimensional GIS”, Bangkok, May 23-25, 2001 
361 
Table 4: Arsenism patients’ distribution and arsenic level & geological features 
Zone 
Arsenic in shallow 
groundwater 
ppm (Mean±SD) 
Arsenic in deep 
groundwater 
ppm (Mean±SD) 
Arsenic in surface 
soil elution 
ppb (Mean±SD) 
Surface soil type 
Zone with 
arsenism patients 
1.24±7.02(85) 
0.68±1.26(13) 
105±210.53(74) 
Sand 
Zone outside 
arsenism patients 
0.11 ±0.28(146) 
0.07±0.33(28) 
77.58±185.66(124) 
Clay 
Significance 
t=1.94,P<0.05, 
1 -tailed 
t=2.40, P<0.05, 
1 or 2-tailed 
t=0.95, P>0.05 
Table 5: Correlation test between total arsenic level in shallow groundwater and distance to river 
Distance to 
river(m) 
50 
100 
200 
300 
400 
500 
600 
700 
800 
900 
1000 
Total arsenic 
level in 
shallow 
groundwater 
(PP m ) 
2.28 
1.22 
0.192 
0.73 
0.2 
0.05 
0.02 
0.03 
0.15 
0.2 
0.08 
SPSS correlation test: 1. Distance within 600 meters: (Spearman’s rho, 1-tailed) R=-0.893, P<0.01 
2. Distance from 50 to 1000 meters: (Spearman’s rho, 1-tailed) R=-0.624, P<0.05 
BÜ Mine&wast«sit«.shp 
River.shp 
Road.shp 
QB Ponds.shp 
TAAs 
F~| 0.001 -O.OSppm 
P I 0.05 - 0.1ppm 
p~~| 0.1 - 0.5ppm 
H 0.5 - 1ppm 
1 -5ppm 
I ]5 - 10ppm 
10 - 20ppm 
20 - 64ppm 
f ] No Data 
Contin 
Elevation Range 
I I 20 - 30m 
30 -40m 
""I 40 - 50m 
I I 50 - 60m 
I 1 60 -70m 
Bi 70 - 80m 
I 1 80 - 90m 
P I 90 - 100m 
I I 100 -200m 
¡~~~1 200 -400m 
400 -600m 
[“□ 600 - 820m 
N 
W 
E 
0.9 
0 
2 
OS 
1.8 Miles 
Fig. 2: total arsenic level in shallow groundwater, 1998. Mining and waste sites, river, road, ponds are 
visualized on a topographic TIN.