EPA-90-H103-02-213

090

900 千元

2001/07/25

2002/10/24

陳家洵 教授

土污基管會

國立中央大學

土壤及地下水

初步評估、等級評定、控制場址、整治場址

remediation site,control site,site ranking,preliminary assessment

『土壤及地下水污染控制場址初步評估方法』原擬草案中共有118個調查項目及22張附表需要填寫，不利控制場址所在地主管機關之執行。考慮到控制場址的污染物濃度已達到或超過管制標準，且各控制場址污染問題多已存在相當長的時間，所以現有污染狀況（污染物種類多寡、濃度高低、分布範圍等）充分反映對人體健康及環境危害之虞。本計畫進行初步評估方法之修正，利用控制場址現有污染狀況為評估依據，並兼顧法令之執行性，將初步評估方法簡化為三階段的評估流程。第一階段包括兩項環境定性評估，若未通過該二項環境定性評估，則將該控制場址評為整治場址；若通過則進行第二階段評估。第二階段查核單一污染物濃度是否超過該污染物管制標準的一定倍數（目前以管制標準的20倍為準）。若超過，則將該場址評為整治場址；若未超過，則進行第三階段評估。第三階段計算土壤及地下水污染總分P值，若P值超過一定標準（目前以20分為準），則將該場址評為整治場址。若通過三階段的評估，則該場址仍維持其控制場址之定位。此外，本計畫亦修正『整治場址污染範圍調查影響環境評估及處理等級評定辦法』，進行適度之簡化及更替。等級評定需對特定之整治場址進行土壤及地下水污染範圍調查，並檢具十項相關基本資料。然後計算土壤污染途徑影響評分(SL)，地下水污染途徑影響評分(GW)，第二地表水污染途徑影響評分(SW)。考慮到整治場址的污染問題主要源於土壤與地下水，故將地表水污染途徑影響權重調為土壤與地下水污染途徑影響之百分之五十；亦即，SL與GW的最高值為100分而SW的最高值為50分。取SL、GW及SW的均方根作為作為污染影響總分(TOL)。整治場址之處理等級分為第一、第二兩級。第一級代表該整治場址應優先整治，第二級代表該整治場址之整治優先順序低於第一級。評定方法則為：(1)第一級：SL或GW任一項>70分，或SW>35分，或TOL>50。(2)第二級：SL或GW小於70分及SW小於35分，且TOL小於50分。

初步評估、等級評定、控制場址、整治場址

0000016330.zip

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[期末報告]公開完整版

2014/10/31 下午 02:07:46

There were 118 investigation items and 22 tables to be filled in the original "Preliminary Assessment (PA) Method of Soil and Groundwater Contamination Control Site". However, not all the 118 investigation items are pertinent to the PA and the proposed method is difficult to implement. By considering that most control sites have existed for years with contamination levels exceeding the control limits, the PA can be effectively carried out by using the current concentration distributions, plume areas, and the number of contaminants of the sites. Accordingly, the PA method is revised in a three-step procedure. The first step includes two qualitative evaluations in health impact. Should the control site fail to pass either of the two evaluations, it is classified as a remediation site. If passed, the PA proceeds to the second step, which checks if there is any one single contaminant concentration exceeding 20 times of its control limit. If so, the control site is classified as a remediation site. If not, the PA proceeds to the third step, which determines the soil and groundwater contamination total score, P. Should P be greater than 20, the control site is classified as the remediation site. If all the three steps are passed, the control site warrants no remediation. This project also revises the "The Methods for Environmental Impact Investigation and the Remediation Site Ranking". The revision sets forth an environmental impact investigation requirement, which includes the establishment of a relatively detailed database for the soil and groundwater contamination of the remediation site. Using the database, the soil contamination pathway impact score (SL), the groundwater contamination pathway impact score (GW), and the surface water contamination pathway impact score (SW) are calculated. The highest value of SL or GW is 100, while that of SW is 50. Should SL or GW be greater than 70, or should SW be greater than 35, the remediation site is ranked as the first class, which signifies an urgent need of immediate remediation. Otherwise, the mean square root of SL, GW, and SW is determined as the total impact score (TOL). If TOL is higher than 50, the remediation site is also ranked as the first class. If TOL is less than 50, the remediation site is ranked as the second class, which indicates no urgent need of immediate remediation and the remediation priority is lower than that of the first class.

remediation site,control site,site ranking,preliminary assessment