07-20-2020-WS - Laserfiche WebLink

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ARDEN HILLS CITY COUNCIL WORK SESSION – JULY 20, 2020 13 on how to manage, screen, or reuse the soil. They recommend the City enroll the project into the MPCA’s Brownfield Program for eligible technical assistance and/or liability assurances related to the PAH and DRO contamination present at the Project Corridor. A requirement of the program would be to have an environmental professional onsite to oversee, screen, and document all excavation and disturbances near known or suspected areas of contamination during reconstruction. The road has been built up over the years and it’s assumed the road base was fill that came from many unknown sources over time. Another scenario was that diesel or fuel oil was sprayed on the road when it was gravel to reduce dust. Oftentimes coating that used to be used on asphalt led to a problem. Mayor Grant asked about control of contaminants, or paving over the areas. Mr. Spenser said the plan they are recommending be prepared would document the materials that can be reused under impervious pavement. Soils at three of the locations that were contaminated would not be able to be reused as road base. Councilmember Holden asked if they did only reclamation but not reconstruction, would reclamation disturb the soil, and how much it would cost to make a plan. Mr. Spenser said reclamation would not get below the road base so impact would be minimized. A utility replacement would have much more disturbance. The Response Action Plan document would cost around $5,000 and the MPCA charges $125 for review. Public Works Director/City Engineer Blomstrom said they are evaluating the need to replace utilities south of Lindey’s. They are rather firm on the opinion there needs to be utility replacement near the intersection at County Road E, but WSB didn’t identify contamination near this intersection. Mr. Spenser noted that contamination was as shallow as two to four feet below grade and as deep as eight to 10 feet. Councilmember Holden felt they had to do the Response Action Plan. Mr. Spenser said now that they know there is contamination, avoiding excavation is advised. They could do directional boring or other plans to not open up a large contamination area. Public Works Director/City Engineer Blomstrom mentioned they are evaluating the watermain along the Snelling Avenue Corridor. The challenge comes in if the City adds a trail along the roadway, it would involve much more handling of the contaminated material. Councilmember Scott would like option 3 as outlined in the agenda memo. Councilmember McClung said he was undecided between option 2 or 3. Councilmember Holmes said between 2 or 3.