2016-08-23_PWETC_AgendaPacket - Laserfiche WebLink

Home

The results were BMPs that included an under -road infiltration chamber system with more than 200 lineal ft. of off-line large diameter perforated pipe placed in a sand envelope; a full cul-de-sac section of street using PaveDrain porous pavement; and more than 20 tree trenches scattered in strategic locations throughout a four -block area. All of these systems were above and beyond what was required by the watershed rules and received cost -share funding from the watershed. Lions Park Natural Park Design and Stormwater Treatment Systems — City of Maplewood, Minn. SEH's team of engineers and landscape architects worked closely with City parks, engineering, and natural resources staff to obtain input from residents during the master planning phase, through the final construction punch list completion. The improvements were needed to eliminate a nuisance drainage problem that left the park unusable after small rainfall events and to upgrade the park to more modern play facilities. The result is a natural based layout of biofiltration basins and active play areas that combines traditional play equipment and more natural play areas that allow interaction with the stormwater treatment system. The project was a win-win for parks and engineering, as the treatment credit obtained provides more than enough credit to meet the needs of future street reconstruction work in the drainage area. Local Experience St. Croix Storm Sewer Lift Station — Roseville, Minn. Roseville retained SEH for the design of the new St. Croix stormwater lift station. The lift station is located at Terminal Road and Fulham Street and pumps from two stormwater ponds connected by two 5 ft. x 4 ft. box culverts. The St. Croix station had two pumps, one with a 125 HP motor and another with a 250 HP motor. The design will include new electrical components located out of the 100 -year flood plain, replacement of the 36 in. force main, and new pumps with VFDs. SEH created an XP-SWMM model to size the pumps and analyze flooding at the ponds and downstream. The final design includes two 200 HP pumps with VFD's, new electrical controls and instrumentation, permanent standby generator, pond bottom erosion improvements, inlet freezing mitigation and site improvements. County Road C Storm System Analysis and Design — Ramsey County, Minn. XP-SWMM storm sewer modeling and design of proposed stormwater ponding areas along the road corridor. The project incorporated water quality treatment and flood storage capacity beyond the needs of the County Road C requirements to help address goals of the City of Roseville. Water Quality Rulemaking Study — Capitol Region Watershed District Evaluation of stormwater treatment options for three hypothetical sites within the highly urban area of the CRWD. SEH was one of four teams looking at the feasibility of meeting various standards that were being considered by the watershed. The study supported the District's volume control standards. Ladyslipper Park Improvements — Roseville, Minn. SEH evaluated several alternatives to provide stormwater treatment for the adjacent street and residential area. The project also included an analysis that looked at options for improving channel conditions for canoe access, evaluating the maintenance and permitting needs, and accounting for wetland impacts and mitigation needs. A stormwater hydraulic modeling and treatment system analysis was completed to determine the level of pollutant removal for the various options Lake Survey Project — Grass Lake Water Management Organization Our team developed bathymetric mapping of portions of Lake Owasso and Lake Wabasso in Roseville and Shoreview. We used the P 8 Urban Catchment Model to evaluate the use of urban Best Management Practices to reduce sediment loading to the lakes. SHORT ELLIOTT HENDRICKSON INC. 15