From the study it was found that in the area, Nakhon SI thammarat at risk in sensitive areas of contamination in groundwater sources are divided into 5 levels is very low, low, moderate, high, and very high, where each level contains an area equal to 5,618,286.23, 502,246.37, 307,007.12, 109, 26, and 333.67 825.76. Rai respectively by the area where the most space is located in a very low level of risk and minimal space space is a very high risk level. The district's area are in various levels of risk can be seen from the table, 4-2, 4-3, 4-4, 4-5 and 4-6 which will see example 5 ratings and risk area level data is susceptible to contamination in the groundwater table is 4-7.
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