1. Resilient Communities Project: The City of North St. Paul Stormwater Quality Improvement Plan for the Urban Ecology Center Subwatershed Petros Paulos Bryan Sprang John Hunter Abigail Tomasek Alexandra Miller

2. Resilient Communities Project The mission of the Resilient Communities Project is to connect communities in Minnesota with the wide-ranging expertise of University of Minnesota faculty and students to address pressing local issues in ways that advance sustainability and resilience. CE5511: “Urban Hydrology & Land Development - taught by Dr. John Gulliver, P. E.

3. Kohlman Lake Subwatersheds Kohlman Lake has been identified for impairment of aquatic recreation (swimming) due to excess nutrients. As a result, it has been placed on Minnesota’s list of impaired waters. In-lake concentration goal is 60 ug/ L. 10- year (summer) average was 98 ug/L (through 2006).

4. Study Area Urban Ecology Center Drainage

5. Study Area Urban Ecology Center Drainage

6. Goals -Assist City of North St. Paul identify specific ways to reduce TP and TSS loading exiting the UEC drainage -Compare several different load-reduction methods and/ or locations within computer model -Provide cost analysis for construction and maintenance of added methods

7. Methods ●Create Current Condition Model ●Obtain Current SCMs ●Delineate into Drainage Areas ●Soil Type and Land Use ●Current SCM Dimensions ●Current Loading: TP=177 lbs/yr TSS=48,000 lbs/yr ●Current SCM Effectiveness: TP=30 lbs/yr TSS=15,000 lbs/yr

8. Raingardens Underground Infiltration Stormwater Control Measures (SCMs)

9. Sumps Street Sweeping

10. UEC Subdrainages SCM type Sub-drainage Number Area (acres) Volume (acre-ft) Number of Practices Rain Gardens60.30.454* Rain Gardens70.71.059* Rain Gardens80.510.766* Rain Gardens90.841.2410* Rain Gardens110.40.65* Rain Gardens120.630.948* Infiltration Basins 90.840.831 Infiltration Vaults 120.51.51 *Based on Rain Gardens being approximately 150 meters cubed

11. Results/ SCMs Sub-drainage Location Stormwater Control Measure (SCM) Total Phosphorous removed* Total Suspended Solids removed** [lbs. / yr.] 6Rain Gardens 3.41,124 7Rain Gardens 10.93,003 8Rain Gardens 61,646 9Rain Gardens 102,888 11Rain Gardens 1.2314 12Rain Gardens 30.96,822 9Infiltration Basin 11.53,246 12Infiltration Vault 32.98,988

12. Results/ SCMs Sub-drainageSCM Practice Construction cost of new SCM [$] Annual O&M [$] *Cost efficiency [$/ per pound of TP removed] *Cost efficiency [$/ per pound of TSS removed] 6Rain Gardens 199,9259,996.262,940.088.89 7Rain Gardens 382,66319,133.161,755.346.37 8Rain Gardens 216,188 10,809.401,801.576.57 9Rain Gardens 434,233 21,711.662,171.177.52 11Rain Gardens 249,27412,463.7110,386.42 39.69 12Rain Gardens 353,976 17,698.82572.78 2.59 9Infiltration Basin 312,084 15,604.212,298.53 # 8.15 # 12Infiltration Vault 1,132,500 8561,737.52 # 6.36 #

13. SUMPs in Parallel SHSAM (BARR Engineering) Sizing Hydrodynamic Separators and Manholes Inputs ●National Urban Runoff Program (NURP) Particle Size Distribution ●Air Temperature Data (Golden Valley) ●Precipitation Data (St. Paul) ●Stormceptor (unknown model #)

14. Results / Sumps ModelUnit Cost ($) Installation Costs ($) Annual Cleaning Costs ($) Average Increase in Load Removal Efficiency (%) Average Increase in lbs TSS Removed per year Cost($) Per lbs of TSS Removed Average Increase in lbs P Removed per year Cost ($) Per lbs of TP Removed 4507,6002,2804003.9 6241.190.243096.60 9009,3232,7974004.3 6761.270.263289.32 120011,0933,3284004.6 7221.340.283465.22 180015,0414,5124005.1 8001.530.313957.70 240017,2205,1664005.3 8361.640.334146.88 360023,3917,0174005.8 9061.950.355056.09 480027,3398,2024006 9402.160.375476.36 600031,4249,4274006.1 9652.370.386030.86 720033,55610,0674006.2 9772.490.386395.65

15. Results / Street Sweeping Street Sweeping Events Lbs. TP removed/ yr Additional lbs. TP removed/ yr Operational Cost Cost/ lb. Current ScheduleApr/ May/ Oct/ Nov 61.1 -$3,532.80$57.82 Enhanced ScheduleApr/ May/ 2 X Oct/ 2X Nov 81.4 20.3 $5,299.20 $65.10 Street Sweeping ●Regenerative Air Sweeper (e.g. TYMCO) ○Possible partnership with neighboring cities ●Cost=$23/Curb Mile ●38.4 Curb Miles

16. Summary Costs SCD Practice SCD location/ type/ schedule *Cost efficiency [$/ lb. of TP removed] *Cost efficiency [$/ lb. of TSS removed] Rain Gardens6 2,940.088.89 Rain Gardens7 1,755.346.37 Rain Gardens8 1,801.576.57 Rain Gardens9 2,171.177.52 Rain Gardens11 10,386.42 39.69 Rain Gardens12 572.78 2.59 Infiltration Basin9 2,298.53 # 8.15 # Infiltration Vault12 1,737.52 # 6.36 # SumpModel 4503,096.60 # 1.19 # Street SweepingApr/ May/ Oct/ Nov57.82-

17. Questions?