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Pribilof Islands Long-Term Groundwater Monitoring
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Installation of a groundwater monitoring well on St. George Island.
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NOAA plans to use groundwater monitoring wells to gather data on contaminant concentration, fate, and transport at Pribilof Island locations where past government operations contributed to the contamination of the site. Of 87 wells on St. Paul Island, 36 will be retained for long term monitoring, 20 will be decommissioned, and 31 will either be transferred to parties other than NOAA or decommissioned. The retained wells will be used to monitor groundwater for a minimum of either three or five years beginning in Fiscal Year 2006 depending on the site; thereafter NOAA will evaluate the data and submit a recommendation to ADEC for future sampling or closure. Water samples will be analyzed for contaminants specific to each site.
Of 47 wells on St. George Island, 25 will be retained, and 22 will be decommissioned. Ten of the retained wells will be used to monitor for the migration of free product plumes located in the industrial and waterfront areas of the City. The remaining 15 retained wells will be used, as needed, for free product removal or process water injection during remediation of the plumes; they may also be used for monitoring of contaminant trends once remedial actions have been completed. As future remedial actions progress, NOAA may decommission a number of these retained wells if it is determined that they are not required for free product removal or long-term monitoring. Wells used for monitoring for free product plume migration (sentinel wells) will be sampled semiannually for five years beginning in Fiscal Year 2006 (subject to funding availability); thereafter NOAA will evaluate the data and submit a recommendation to ADEC for further sampling or closure. Water samples will be analyzed for contaminants known to be present in the City area groundwater aquifer.
Downloads
Click on the following links to view copies of the Long-Term Groundwater Monitoring Plans. |
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