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年度	102	專案性質	實驗性質
專案類別	研究專案	研究主題	調查
申請機構	國立台灣大學	申請系所	地質科學系
專案主持人	李紅春	職等/職稱	教授
專案中文名稱	以多種同位素與地球化學分析技術(MEIGA)研究中壢工業區地下水污染
中文關鍵字	地下水；三氯乙烯；同位素；地球化學分析
專案英文名稱	Study of groundwater contamination in Chungli Industrial Technology Area by Multiple-evidence of isotopic and geochemical approach (MEIGA)
英文關鍵字	MEIGA
執行金額
執行期間	2012/12/10 至 2013/12/9
計畫中文摘要	本計畫用同位素和地球化學方法（Multiple-evidence of isotopic and geochemical approach, MEIGA）研究中壢工業區的地下水污染，將對研究區的地表水/地下水在 旱季、雨季和颱風過後分別採樣，進行同位素和地球化學分析。檢測分析項目包 括 pH、溶氧、導電度、氨氮、 18O，D， 13C（DIC），K，Na，Li，Ca，Mg，Sr， Ba，Fe，Mn，Al，Cu，Zn，Ni，Ga，三氯乙烯。 自計畫執行以來，我們在中壢工業區採集地表水和地下水共 81 個樣品。從這 些樣品的地球化學數據來看，該區的主要發現是：1. 中壢工業區 CL02 井位的三氯 乙烯污染，基本是近處排放到地下水的污染，擴散範圍不大；2. 內定國小處地下 水的輕度污染可能是從 CL02 井位處擴散來的。3. 除此之外，中壢工業區地下水在 本次調查中，沒有顯示含氯有機物（三氯乙烯）污染狀況。還表現為沒有重金屬 污染；氨氮的濃度還不如河水中的高，某些區段河水由於生活排放廢水導致氨氮 濃度偏高（11ppm）。 除了中壢工業區的污染調查之外，我們還延續了頭份工業區的污染調查。在 去年的報告中，有關臺氯頭份廠內，“大坑”西南角處的污染來源，需要進一步 查明。我們在 2013 年 5 月 15 號，大雨中採樣，發現該處的污染來自地表並且水樣 的 pH 和電導度都偏高，污染來源有兩處：中石化排放水和中普氣體廠對面之排水 管。從分析數據結果來看，所有中壢工業區的地下水樣品，無論是常量元素，還 是微量元素的濃度都很低，遠遠低於頭份工業區的地下水元素濃度。而且，中壢 工業區的地下水與地表水的元素濃度相當，說明地表水在下滲過程中，沒有礦物 的溶解，也沒有工業廢水排放的影響。這與氫氧同位素的結果也可以相互印證。 無論是頭份工業區還是中壢工業區都存在雨季導電度和污染濃度都高於旱 季，在臺氯頭份廠內“大坑”西南角處採樣時，暴雨中廢水排放增加，這些現象 表明在雨季有偷排現象。因此，本研究建議，環保單位應該：1. 對造成 CL02 井位 處污染的廠商進行監督；2. 對“大坑”西南角處的排水溝釋放廢水的單位進行調 查，制止污染物排放；3. 加強雨季監測措施，有效防止偷排。4. 鑒於 MEIGA 法 能夠行之有效地了解地下水的來源、運移和變化，對判斷污染來源和成因有重要 作用，應該推廣用於地下水的研究和監測。
計畫英文摘要	According to the investigation on 22 industrial technology areas during the past 2~3 years by Taiwan EPA, there are four industrial technology areas with Red Light sign which means that the areas have significant contamination and high potential proliferate. The investigation result called up strongly public attention. Chungli Industrial Technology Area is one of the sites with Red Light sign. Under such a circumstance, the local and central governments have ordered the related corporations and manufactories to clean up the contamination. One may cut off current discharge of pollutants from those manufactories. But, the pollutants in the contaminated site will continue to spread in groundwater. How do those pollutants migrate in the groundwater? Where are the sources of the pollutants in both surface and underground? How do the geological and hydrological conditions to influence penetration, diffusion and mixing of the pollutants in the groundwater system? Answers to these questions will be the key to clean up the contaminations. In this proposed project, we plan to collect surface water and groundwater samples in the Chungli Industrial Technology Area in both wet and dry seasons and to measure samples for pH, DO, conductivity, NH3-N, D,  18O,  13C of DIC, and elemental contents of Na, K, Li, Ca, Mg, Sr, Ba, Fe, Mn, Al, Zn, Cu, Ni, Ga, concentrations of Trichloroethene. In this project, we have collected 81 samples including groundwaters and surface waters from Chungli Industrial Technology Area. Based on the preliminary results, we find that the pollution of the groundwater in Chungli Industrial Technology Area is much less compared to Toufen Industrial Technology Area. The contamination source at CL02 well site comes from nearby manufactory. This contaminated source might spread to the groundwater in the Neiding Elementary school. The D and  18O relationships of the samples indicate that the groundwater is mainly from the surface water with no indication of industrial waste water. There is no heavy metal contamination in the groundwater. High concentrations (~11 ppm) of NH3-N appeared in the river water near some residential area and the NH3-N concentrations in the groundwater samples are generally low. Only one sample shows slightly high Trichloroethene concentration. The conductivity and elemental concentrations are generally low in all samples. In addition, we have continued the investigation of Toufen Industrial Technology Area in which the contamination source at the southwest corner of “Dakeng” was noclear during the project of last year. On May 15, 2013, we have sampled the surface water in this location, and found that the surface water contained high pH and conductivity. We suspect that the surface water may indicate the contamination source which comes from outlets nearby. All samples of groundwater in the Chungli Industrial Technology Area, whether it is a constant element, or the concentration of trace elements are low, much lower than those samples in the Toufen Industrial Technology Area. Moreover, the groundwater and surface water element concentration in the Chungli Industrial Technology Area, shows that surface water in the process of infiltration, no mineral dissolution, also does not have the effect of industrial waste water discharge. This can match with the results of hydrogen and oxygen isotope. From the results of this project, we suggest that (1) Local EPA should check out the manufactories who dumped the pollution source into the groundwater at CL02 well site. (2) Local EPA should check out the contamination source from the outlets at the southwest corner of “Dakeng”. (3) Monitoring outlets of manufactories in the industrial areas during rainy days. (4) Applying MEIGA method in more areas and sites.