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08-26-19-R
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08-26-19-R
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TCAAP AUAR Update 7 <br />August 2019 <br />which were located within the AUAR study area. Based on the USACE and RCWD <br />jurisdictional determinations, the impacts within the AUAR study area did not require <br />mitigation; however, the impacts outside the AUAR study area required both state and <br />federal mitigation of 0.6552 acres. Half of this replacement was created adjacent to the <br />new creek alignment and half was purchased from available approved wetl and bank <br />credits. <br />No additional mitigation measures are needed based on this updated information. <br />Stormwater <br />A Comprehensive Stormwater Management Plan (CSMP) was approved for the AUAR study <br />area in 2015. The CSMP presents the approach for meeting RCWD’s Water Quality <br />Treatment and Peak Stormwater Runoff Control requirements and is intended to streamline <br />the regulatory permit approvals needed when development occurs.3 The CSMP will be <br />updated as development occurs to reflect any changes to the RCWD Rules or site plan <br />modifications since the CSMP was approved. <br />4.2.3. Contamination/Hazardous Materials/Solid Wastes <br />Demolition and remediation within the AUAR study area was completed by Ramsey County <br />in 2015. In July 2016, the Minnesota Pollution Control Agency (MPCA) issued a Certificate of <br />Completion for the broader TCAAP site, including the AUAR study area.4 The site was <br />cleaned to residential standards. At the time the Certificate of Completion was issued, <br />Ramsey County owned 397 acres of the 427-acre site and leased the remaining 30 acres. <br />Ramsey County has since acquired the remaining 30 acres and has filed for an Amended <br />Environmental Covenant, which will remove land use controls but retain the existing <br />groundwater restrictions. <br />Ramsey County has requested that the US Environmental Protection Agency officially delist <br />soil at the site from its Superfund list. The US Army will continue to operate the existing <br />groundwater cleanup system . In 2018, the US Army conducted an optimization study for the <br />groundwater cleanup system,5 and groundwater treatment is expected to continue until <br />approximately 2040.6 No additional mitigation measures are needed. <br /> <br />3 The CSMP is available at http://ricecreekcommons.com/wp-content/uploads/docs/Rice-Creek- <br />Commons-CSMP.pdf. <br />4 Available at http://ricecreekcommons.com/wp-content/uploads/2016/07/TCAAP-Redevelopment- <br />Certificate-of-Completion-06122016.pdf. <br />5 Available at http://eml9g2kib3430igb0341sat1.wpengine.netdna-cdn.com/wp- <br />content/uploads/docs/TCAAP_Draft-Final-OU-Remedy-Review_20180131-v1_0-1.pdf. <br />6 Additional information on remediation of the broader TCAAP site is available at <br />https://www.pca.state.mn.us/waste/new-brightonarden-hills-superfund-site-aka-twin-cities-army- <br />ammunition-plant-or-tcaap#overview-937c145d.
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