Issues and/or eliminate trespassing to the Site. 3 UTA and the Agencies will evaluate the impact of the new MCL on the current Completed U.S. EPA Change in and revised monitoring & UDEQ Arsenic program(s). MCL The Site Monitoring Plan 4 will be updated to reflect current Site conditions, U.S. EPA SMP is the EC, the revised Completed & UDEQ Outdated groundwater monitoring UTA program and inspection requirements. Additional ICs, called for in 5 the Action Memorandum, ICs Not Fully U.S. EPA will be implemented in an Implemented Completed EC that is in final draft & UDEQ form and has been agreed UTA upon by all parties. Results of Implemented Actions: Issue 1. When quarterly monitoring began in 1999, well MW-7 was consistently below the detection limit for arsenic. Monitoring well MW-7 was located along the western property boundary and was intended to serve as a point-of-compliance well. The well was destroyed during construction of a subsurface power utility corridor associated with the construction of the flyover bridge in 2004 and was replaced with monitoring well MW-7A, located approximately 9 feet east of MW-7. For the 7 quarters this well was sampled, arsenic was above the MCL of 50 ug/L. In 2006, MW-7A was damaged by equipment being used in bridge construction activities and was replaced with MW-7B, also located about 9 feet east of MW-7.
Issues and/or eliminate trespassing to the Site. 3 Change in Arsenic MCL UTA and the Agencies will evaluate the impact of the new MCL on the current and revised monitoring program(s). Completed U.S. EPA & UDEQ 4 SMP is Outdated The Site Monitoring Plan will be updated to reflect current Site conditions, the EC, the revised groundwater monitoring program and inspection requirements. Completed U.S. EPA & UDEQ UTA 5 ICs Not Fully Implemented Additional ICs, called for in the Action Memorandum, will be implemented in an EC that is in final draft form and has been agreed upon by all parties. Completed U.S. EPA & UDEQ UTA Results of Implemented Actions: Issue 1. When quarterly monitoring began in 1999, well MW-7 was consistently below the detection limit for arsenic. Monitoring well MW-7 was located along the western property boundary and was intended to serve as a point-of-compliance well. The well was destroyed during construction of a subsurface power utility corridor associated with the construction of the flyover bridge in 2004 and was replaced with monitoring well MW-7A, located approximately 9 feet east of MW-7. For the 7 quarters this well was sampled, arsenic was above the MCL of 50 ug/L. In 2006, MW-7A was damaged by equipment being used in bridge construction activities and was replaced with MW-7B, also located about 9 feet east of MW-7.
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