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首页> 外文学位 >Evaluation of groundwater flow and contaminant transport at the Wells G&H Superfund Site, Woburn, Massachusetts, from 1960 to 1986 and estimation of TCE and PCE concentrations delivered to Woburn residences.
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Evaluation of groundwater flow and contaminant transport at the Wells G&H Superfund Site, Woburn, Massachusetts, from 1960 to 1986 and estimation of TCE and PCE concentrations delivered to Woburn residences.

机译：1960年至1986年，对马萨诸塞州沃本市Wells G＆H超级基金站点的地下水流量和污染物迁移进行了评估，并估算了运至沃本住宅区的三氯乙烯和三氯乙烯浓度。

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Contamination of municipal wells G and H was discovered in 1979 and was statistically linked by epidemiological studies to leukemia cases that occurred in Woburn, Massachusetts in the late 1960's through the early 1980's.; Historical contamination of the buried valley aquifer at the 133 hectare Wells G&H Superfund Site is simulated using MT3D-HMOC code to determine the possible contamination history of the wells with TCE and PCE. A MODFLOW groundwater flow model calibrated using measured heads, measured streamflow gains and losses, and tritium/helium-3 groundwater ages was used to compute flow velocities. The 26-year transient groundwater flow model incorporates realistic pumping schedules and variable recharge rates.; Although the wells operated from 1964 to 1979, the transport model spans the period 1960 to 1985 so that the simulated concentrations can be compared to water quality measurements from 1979 through 1985. At least five local sources contributed TCE, PCE, and other contaminants to the groundwater system. The precise contaminant release times and source concentrations are not known for the sites. Historic aerial photographs, EPA documents, trial documents, and personal accounts of site investigators were used to estimate source locations and source release times. Water quality samples were used to estimate source concentrations.; Eleven plausible scenarios, comprising 66 simulations, are used to test hypotheses of source concentrations, source release times, and contaminant retardation factors. Based on the results, it is likely that TCE contamination reached well G between 1966 and 1968. The estimated range of TCE plus PCE concentrations at well G from 1964 to 1979 is from 10's to 100's of ppb.; The concentrations of TCE and PCE in wells G and H predicted by the contaminant transport model are multiplied by the fraction of wells G and H water predicted by a water distribution model to estimate the range of concentrations that were likely delivered to the residents in Woburn. Results show that exposure to TCE plus PCE varied greatly, depending on the date and location in Woburn. These results can be used by public health scientists to explore further the possible causes of the Woburn childhood leukemia cluster.
机译：1979年发现了市政井G和H的污染，并通过流行病学研究与1960年代末至1980年代初期在马萨诸塞州沃本发生的白血病病例进行了统计联系。使用MT3D-HMOC代码模拟了133公顷Wells G＆H超级基金站点中埋藏的谷底含水层的历史污染，以确定TCE和PCE可能造成的污染历史。使用测得的水头，测得的水流得失和流量以及tri /氦3地下水年龄对MODFLOW地下水流模型进行了校准，以计算流速。 26年的瞬态地下水流量模型结合了实际的抽水时间表和可变的补给率。尽管这些井从1964年到1979年运行，但运输模型跨越了1960年至1985年，因此可以将模拟浓度与1979年至1985年的水质测量结果进行比较。至少有5个当地水源对TCE，PCE和其他污染物产生了影响。地下水系统。对于这些地点，确切的污染物释放时间和源浓度是未知的。历史航空照片，EPA文件，试验文件和现场调查人员的个人帐户被用于估算源头位置和源头发布时间。水质样品被用来估算水源浓度。包括66个模拟在内的11种可能的情况用于测试源浓度，源释放时间和污染物延迟因子的假设。根据结果​​，TCE污染很可能在1966年至1968年之间达到了G井。从1964年到1979年，G井中TCE加上PCE的浓度范围估计为ppb的10到100。将污染物迁移模型预测的G和H井中TCE和PCE的浓度乘以水分配模型预测的G和H井中水的比例，以估算可能输送给沃本居民的浓度范围。结果表明，TCE和PCE的接触量差异很大，具体取决于Woburn的日期和位置。公共卫生科学家可以利用这些结果进一步探讨沃本儿童期白血病群的可能原因。

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