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, OF WATERCRAFT ON ANY WATER BODY INCLUDING CURRENT AND PROJECTED WATERCRAFT . USAGE A new crossing of Rice Creek is needed at CR H for a site access road. The crossing is assumed to be via a bridge that spans the creek, wetlands and floodplain, and would allow wildlife to cross underneath. A trail crossing at this location may also be considered (under the creek bridge). It is assumed that the bridge will be designed to have no impact on the floodplain. Ramsey County is conducting a design study for the creek crossing and the required coordination with the RCWD. The project will not change the number or type of watercraft on any waterbody. 12.C/HM/W ONTAMINATIONAZARDOUSATERIALSASTES a.P--D REPROJECT SITE CONDITIONSESCRIBE EXISTING CONTAMINATION OR POTENTIAL ENVIRONMENTAL HAZARDS ON OR IN CLOSE PROXIMITY TO THE PROJECT SITE SUCH AS SOIL OR GROUND WATER ,,,, CONTAMINATION ABANDONED DUMPS CLOSED LANDFILLS EXISTING OR ABANDONED STORAGE TANKS AND .D- HAZARDOUS LIQUID OR GAS PIPELINESISCUSS ANY POTENTIAL ENVIRONMENTAL EFFECTS FROM PRE PROJECT SITE CONDITIONS THAT WOULD BE CAUSED OR EXACERBATED BY PROJECT CONSTRUCTION AND .I,, OPERATIONDENTIFY MEASURES TO AVOID MINIMIZE OR MITIGATE ADVERSE EFFECTS FROM EXISTING .IC CONTAMINATION OR POTENTIAL ENVIRONMENTAL HAZARDSNCLUDE DEVELOPMENT OF AONTINGENCY PRAP. LAN ORESPONSECTIONLAN TCAAP was constructed in 1941 to produce small-caliber ammunition and related materials. Production levels varied over time and ceased in 2005. The production operations resulted in the release of hazardous substances into the environment, and in 1983 the site was placed on the National Priorities List as the New Brighton/Arden Hills Superfund Site. 5 According to the US Environmental Protection Agency (EPA), the wastes disposed at TCAAP included volatile organic compounds (VOCs) (including Trichloroethylene or TCE), semi-VOCs, metals, polychlorinated biphenyls (PCBs), cyanide, pesticides, and explosives. The primary impact to the surrounding communities has resulted from VOC contamination of the regional groundwater source. The AUAR study area is located in what is known as Operable Unit 2 (OU2). In 1997 a Record of Decision (ROD) for OU2 was signed, and by summer 2002 remedial and removal actions were largely complete. The remaining cleanup action required by the OU2 ROD was excavation and installation of soil covers at Site C (within the AUAR study area) which was completed in 2009. A plume of VOC-contaminated groundwater was discovered around Building 102 (seeFigure 12-1), and the removal action was implemented and completed in 2009. An extensive long-term monitoring program for groundwater, surface water, and sediments is currently in place and will continue into the future. 6 The US Army is the responsible party for the Superfund site. In 2010, the EPA and MPCA approved the Army’s Land Use Control Remedial Design (LUCRD) document. The land use controls were aimed at areas with residual groundwater contamination, areas with residual soil contamination below the cleanup levels but above levels allowing unlimited use or unrestricted exposure, and areas with residual soil contamination above the cleanup levels (areas with covers). 5 Wenck Associates, Inc.Operable Unit 2 (OU2) Land Use Control Remedial Design (LUCRD) New Brighton/Arden Hills 5 Superfund Site. September 2010. US Environmental Protection Agency. Region 5 Superfund: New Brighton/Arden Hills/TCAAP (Summary). August 2013. 6 Accessed 6 January 2014.http://www.epa.gov/region5/superfund/npl/minnesota/MN7213820908.html. June 2014– Final AUAR15