Agenda - Council - 06/11/2024 - Laserfiche WebLink

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Catchment Profiles Project ID: RR8mA Rivers Bend Park Pond Modification Drainage Area — 38.0 acres Location — Rivers Bend Park south of 142nd Ave NW — Waco St. NW intersection Property Ownership — P u b l i c Site Specific Information — The existing pond, P25216 receives drainage from the entire catchment and is currently undersized to treat the contributing drainage area. An expansion and dredging of the pond is recommended to increase the permanent pool storage, thereby promoting sediment settling and phosphorus retention. Proposed increases in pond storage will increase permanent pool surface area from .11 acres to .82 acres and average ponding depth from 1 ft. to 6 f C I d I Id BM Modification i r BMPdranageArea ' AStorm Sewer Lime 0 Outfail r". IIL}, Ili;. 0 Catch Basin y y NN e - ;ti 4 jop lot ,,*- �-- V av � * +� � � is •, 5 rVk r 3 . a 0 0.025 9.05 0.1 L. umu ative pon storage vo ume cou increase from an estimated 0.05 acre-feet to approximately 2.0 acre-feet. Cost/Removal Analysis 2 3 • - • ' • 3,100 cu-yards 3,100 cu-yards 31100 cu-yards 7.7 47.8% 7.7 47.8 % 7.7 47.8 % 31672 66.4% 31672 66.4% 31672 66.4% • 0.2 1.0% 0.2 1.0% 0.2 1.0% $5,840 $5,840 $5,840 - • - • - $147,000 $193,500 $245,000 $152,840 $199,340 $250,840 • • �. ► $900 $900 $900 30-yr Average Cost/lb-TP $779 $980 $1,203 u 30-yr Average Cost/1,000lb-TSS $1,633 $2,055 $2,522 W 30-yr Average Cost/ac-ft Vol. N/A N/A N/A *Indirect Cost: 80 hours at $73/hour **Direct Cost: See Appendix B for detailed cost information ***$1,000/acre of pond surface area - Annual inspection and sediment/debris removal from pretreatment area City of Ramsey Stormwater Retrofit Analysis