Wastes of electric wire, magnetic card and/or electric instrument part, etc. had been incinerated at the areas around northwest part of Main road and around both river sides of the Er-Jen River. These incineration areas are illustrated as a mark of mesh in Fig. 1. All marketing samples shown in Table 1 were milkfish (Chanos chanos) cultivated in Wan-Li. However, the locations of culture ponds for these fish were unclear.