Agenda - Council Work Session - 03/29/2011

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N M 11 3.2. Phase I ESA Former Oasis Mart RAP /CCP Project SP- 09- 003784A November 16, 2009 Page 3 A Phase I Environmental Site Assessment (Phase I ESA) was completed for the Site by Northern Technologies (Northern) in March 2006 (Northern 2006). Northern completed the Phase I ESA for the city of Ramsey, and reported that the site contained one building and a canopy area covering the gasoline dispenser area. The Phase I ESA was also reported that the ground surface was paved around the gas dispensers and east and west of the store building for vehicle traffic and parking; that the remainder of the Site was covered with native prairie vegetation; and that some fill soil existed on the west end of the Site where a mound system for a septic drain field existed. The Phase I ESA concluded that there were no recognized environmental conditions associated with the Site, because the identified LUST facility at the Site had received regulatory closure and Northern concluded minimal environmental threat based on distance from the Site and groundwater flow direction. We conclude that the closed LUST facility would be considered a historic REC. 3.3. UST Removal Results R.J. Rykken Consulting, Inc. observed the removal of two 10,000 - gallon gasoline USTs from the site in July 2009. The USTs were observed to be in good condition with no significant holes or corrosion. No visual or olfactory indications of soil impacts were observed in soils, and PID readings did not exceed 0.0 ppm. A total of four soil samples, one from each end of the two USTs, were collected from 1 foot below the bottom of the USTs and analyzed for PVOCs and GRO. The only compound detected was 1,2,4 - Trimethylbenzene, with concentrations ranging from 0.030 mg /kg to 0.071 mg /kg. 1,2,4 - Trimethylbenzene concentrations were at least two orders of magnitude less than the applicable Tier 2 Residential SRV of 8 mg /kg. The results were submitted to the MPCA in RJR, 2009. The following recommendations were included in a file review document completed by Braun Intertec in September 2009: • Prepare a Response Action Plan /Construction Contingency Plan (RAP /CCP) for demolition activities in the vicinity of the Site. • The site should be enrolled in the MPCA Petroleum Brownfields Program (PBP) and a copy of the RAP /CCP submitted to PBP staff for approval a minimum of 30 -days prior to starting demolition and /or redevelopment activities.