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ARDEN HILLS CITY COUNCIL - NOVEMBER 10. 1997 4 . A. Ramsey County Discnssion, Jim Tolaas, Arden Manor Mobile Home Park (continued) Mr. Tolaas reviewed the plan that was discussed during his last presentation before the Council and explained revisions being proposed to shift the intersection somewhat to the north. He addressed their considerations on how to reduce the impact to Round Lake and still bring the Old Highway 10 connection into the Gateway Business District, yet away from the freeway intersection. He noted this will also provide a greater separation and allow a higher level of safety, ML Tolaas noted the location of the mobile home park and advised that it is anticipated that 17 homes may be impacted with the first plan, He reviewed a second proposal and options to reduce this impact to II homes by constructing a $250,000 retaining wall along Round Lake. He explained that Round Lake is heavily contaminated, so the County does not want to encroach at all into that area, He noted that this may reduce the impact to the mobile home park by six to seven units or $16,000 to $17,000 per mobile home park pad plus relocation costs to purchase the unit and relocate the occupants to a functionally equivalent unit, or $15,000 to $20,000 per unit. ML Tolaas explained that by investing in a $250,000 retaining wall, it will reduce the impact to eleven displaced families and the need to permanently relocate six or eight which is almost an equal cost offset ML Tolaas presented details of the entrance points to the mobile home park and Gateway Business District and areas of drainage which will be captured by a drainage system prior to . being released into a ponding area, He stated they have approached the State about cost participation with the freeway interchange but the State has delayed their decision until decisions are reached about the Highway 96 and Highway 10 intersection. He advised the State had indicated it may cost up to $60 million to get the freeway interchanges up to capacity. ML Tolaas explained that the service level of the intersection at Highways 96 and 10 may be reduced to a service level of "F" so the State suggested a grade separation at Highway 1 0 (a "fly over''), ML Tolaas stated they looked at cost estimates, grade changes, interchange connections, and determined that it is not possiblc to provide interchange connections due to the elevations. This will place a greater impact on I-35W. Gary Erickson, consulting engineer with BR W, explained that the grades would be impacted west of the North Heights Luthcran Church entrance, ML Tolaas explained that with a grade separation, Highway 10 can come in at the same location and the Highway 10 service road can be eliminated, Also, the section of roadway along the mobile home park can be shifted south to further minimize impact It also provides the opportunity to shift the entrance to the east to allow greater separation to the freeway interchange. ML Tolaas reported the cost estimate is about $1 million for a bridge structure at Highways 96 and 10, without ramp structures. He noted that the lack of ramp structures will create an impact. ML Tolaas pointed out the project boundary and right-of~way lines and area of impact to a . number of rear lots within the mobile home park. He explained how Highway 96 will have to be changed in elevation to provide more of a flat surface at the intersection,