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HomeMy WebLinkAboutCouncil Presetnation 12-03-2019 - TOM_Sewer_Master Plan© 2014 HDR, Inc., all rights reserved. Marana Sewer Conveyance System Master Plan Mayor and Council Presentation December 3, 2019 One water reclamation facility 53 miles of gravity mains o 8-in to 24-in diameter o 1,250 manholes 2 lift stations o 1.5 miles of forcemains Existing System Model created from Town’s geodatabase Established pipe and manhole elevations Flows assigned based on Pima County parcels Hydraulic model will be a deliverable Hydraulic Model Development Flow monitoring at four locations to establish: o Diurnal curve (flow variation over 24-hour period) o Residential and commercial flow rates Also validates model performance Model Calibration Existing system has remaining available capacity Susceptible to rainfall inflow and infiltration Existing System Performance Future Developments and Forecasting Flows Development Total EDUs to be Assigned 2020-2025 2026-2035 2036+ West of I-10 Anway Farms 280 0 0 280 Barrios de Marana 430 0 100 330 Cypress Gardens 165 0 165 0 Farm Field Five 91 91 0 0 Gladden Farms 69 69 0 0 Gladden Farms II 2,902 750 1,500 652 Honea Heights 91 0 0 91 Las Pilas 420 0 0 420 Marana Gardens 44 0 0 44 Marana Main Street 112 56 56 0 Marana Mercantile 156 0 156 0 Marana Towne Center 3,236 40 200 2,996 Payson Farms 367 0 367 0 Rancho Marana 209 100 109 0 Rancho Marana Town Center 396 40 99 257 Saguaro Bloom 1,737 875 862 0 Sanders Grove 2,576 100 700 1,776 Shops at Tangerine 1,124 0 200 924 Tangerine Commerce Park 448 150 210 88 Uptown at Marana 1,414 0 210 1,204 Vanderbilt Blocks 1,701 100 451 1,150 Villages at Barnett 251 50 201 0 Sub-Total 18,220 2,421 5,586 10,212 East of I-10 La Mirage Estates 507 0 0 507 Mandarina 3,360 0 700 2,660 The Villages of Tortolita 6,500 300 1250 4,950 Tortolita Shadows 1,788 0 0 1,788 Sub-Total 12,155 300 1,950 9,905 TOTAL 30,375 2,721 7,536 20,117 0 1,000,000 2,000,000 3,000,000 4,000,000 5,000,000 6,000,000 2015 2020 2025 2030 2035 2040 2045 2050 2055Flow (gpd)Year Existing WRF is expandable to 4.5 MGD Future flows will likely exceed Ultimate capacity between 2045 –2050 Modeled flows are consistent with WRF Master Plan Projections Available Treatment Capacity Required Treatment Capacity Flow Projection –High Flow Projection –Low 2nd WRF could relieve flow burden on existing WRF Look at both options o Option 1 –One WRF o Option 2 –Two WRFs Developing Alternatives 0 500,000 1,000,000 1,500,000 2,000,000 2,500,000 3,000,000 3,500,000 4,000,000 4,500,000 5,000,000 2015 2020 2025 2030 2035 2040 2045 2050 2055Flow (gpd)Year Required Treatment Capacity Flow Projection –High Flow Projection –Low Alternative 1A Sagebrush Road Alternative 1B Sagebrush Road & Grier Road SAGEBRUSH SAGEBRUSH GRIER RD Alternative 2A Sagebrush Road Alternative 2B Sagebrush Road & Grier Road 10” FM SAGEBRUSH SAGEBRUSH GRIER RD CIP Costs (2020 –2025) Improvement ID Size / Quantity Total Cost 1 15-inch x 3,700 LF $1,265,642 2 18-inch x 5,200 LF $2,031,837 3 18-inch x 1,200 LF $631,875 4 350 gpm capacity $571,336 5 6-inch x 5,100 LF $1,829,410 6 Remove Flow Diversions at Clark Farms Road + Sanders 21-inch Gravity $714,150* 7 18-inch x 6,800 LF $2,466,961 8 210 gpm capacity $342,423 9 6-inch x 6,800 LF $616,740 TOTAL $9,853,635 *Included in current impact fees CIP Costs (2026 –2035) Improvement ID Size / Quantity Total Cost 10 21-inch x 800 LF $395,395 11 21-inch x 3,800 LF $2,238,048 12 21-inch x 5,300 LF $3,236,940 13 27-inch x 2,800 LF $1,475,636 14 27-inch x 5,300 LF $2,639,118 15 27-inch x 5,900 LF $2,930,462 16 24-inch x 11,800 LF $5,327,425 17 750 gpm capacity $1,225,913 18 16-inch x 4,200 LF $1,017,811 19 0.5 MGD New WRF $11,351,047 20 1.5 MGD Existing WRF Expansion $34,053,142 TOTAL $65,890,938 CIP Costs (2036 –2050) Improvement ID Size / Quantity Total Cost 21 27-inch x 5,300 LF $2,639,118 22 1,400 gpm capacity $2,289,128 23 10-inch x 9,000 LF $1,362,126 24 1.0 MGD New WRF Expansion $22,702,095 25 1.5 MGD Existing WRF Expansion $34,053,142 TOTAL $63,045,608 Long term planning tool for use by Town and developers Finalize the study Project Deliverables o Master Plan Report o Hydraulic Model PAG 208 plan will be required for new WRF Costs for proposed improvements are either reimbursable or paid for by the developer Summary Questions