Updated Master Plan for Water Recycling Centers Steve Clouse Chief Operating Officer
Page 2 Historic sewerage systems 191: Mitchell Lake 1933: Rilling Road 1894 collection system
Page 3 Major and Minor I-1 Leon Facilities of the 199s Major Facilities Helotes SA Ranch 164 Salado Medio WRC Leon WRC Dos Rios WRC Salado WRC Dos Rios Leon Culebra Olmos 41 Salado Medio Medio NSISD Minor Facilities Culebra NSISD SA Ranch SSISD Medio WRC 9 Medina River Leon WRC 5 1 Mitchell Lake SSISDS Updated Master Plan for N Water MILES Recycling Centers 37 Braunig Lake Calaveras Lake Salado WRC Dos Rios WRC 164 San Antonio River
Page 4 Facility Consolidations and Eliminations Leon I-1 Salado Medio WRC Leon WRC Dos Rios WRC Salado WRC Helotes All minor facilities eliminated Salado/Dos Rios sewersheds consolidated and Salado facility eliminated Medio SA Ranch 164 Culebra NSISD Olmos 41 Biosolids transfers from Medio/Leon consolidate all solids processing at Dos Rios Medio WRC 9 Medina River Leon WRC Mitchell Lake Braunig Lake Salado transfer line Calaveras Lake Salado WRC SSISDS 5 1 Updated Master Plan for N Water MILES Recycling Centers 37 Dos Rios WRC 164 San Antonio River
Page 5 Medio WRC Future Service Areas Leon I-1 Salado Leon WRC Dos Rios WRC Helotes 164 Olmos 41 Medio Area to be added by MRSO 9 Medina River Mitchell Lake Project includes diversion of some flow from Leon service Calaveras Lake area to Dos Rios Braunig Lake 5 1 Updated Master Plan for N Water MILES Recycling Centers 37 164 San Antonio River
SAWS' Total Effluent Volumes Page 6 25, Effluent Volumes by Year, 1935-29 2, acre feet 15, 1, 5, 193 35 194 4 194 45 195 5 195 55 196 6 196 65 197 7 197 75 198 8 198 85 199 9 199 95 2 2 5
Page 7 How far can conservation take us? 7,, 225 6,, 5,, water customer 4,, population 3,, 2,, 1,, projected water customers water customers (2.5% growth rate) 198 1985 199 1995 2 25 21 215 22 225 2 175 15 125 1 75 5 25
Page 8 How far can conservation take us? gpcd 7,, 225 6,, 5,, water customer 4,, population 3,, 2,, 1,, actual gpcd projected water customers water customers (2.5% growth rate) 198 1985 199 1995 2 25 21 215 22 225 2 175 15 125 1 75 5 25
Page 9 How far can conservation take us? gpcd 7,, 225 6,, 5,, water customer 4,, population actual gpcd gpcd decline to 116 in 216 2 175 15 125 3,, 1 2,, 1,, projected water customers water customers (2.5% growth rate) 198 1985 199 1995 2 25 21 215 22 225 75 5 25
Page 1 How far can conservation take us? gpcd 7,, 225 6,, 5,, water customer 4,, population actual gpcd gpcd decline to 116 in 216 116 2 175 15 125 3,, 1 2,, 1,, projected water customers water customers (2.5% growth rate) 198 1985 199 1995 2 25 21 215 22 225 75 5 25
Page 11 How far can conservation take us? gpcd 7,, 225 6,, 5,, water customer 4,, population 3,, actual gpcd gpcd decline to 116 in 216 116 11 2 175 15 125 1 2,, 1,, projected water customers water customers (2.5% growth rate) 198 1985 199 1995 2 25 21 215 22 225 75 5 25
Page 12 How far can conservation take us? gpcd 7,, 225 6,, 5,, water customer 4,, population 3,, 2,, 1,, actual gpcd water customers gpcd decline to 116 in 216 no WW growth" gpcd 116 11 92 projected water customers (2.5% growth rate) 198 1985 199 1995 2 25 21 215 22 225 2 175 15 125 1 75 5 25
WRC Capacities and Flows (mgd) 27-29 14 Page 13 permit limit (125) 12 1 million gallons per day 8 6 4 2 permit limit (16) 6.4 permit limit (46) 3 year average 36.6 3 year average 81.4 Medio Leon Dos Rios
WRC Capacities and Flows (mgd) 27-29 14 Page 14 12 permit limit (125) 1 Planning required 93.75 million gallons per day 8 6 4 2 Planning required Planning required 12 34.5 permit limit (16) 6.4 permit limit (46) 3 year average 36.6 3 year average 81.4 Medio Leon Dos Rios
WRC Capacities and Flows (mgd) 27-29 14 Page 15 permit limit (125) 12 1 construction ti required 112.5 million gallons per day 8 6 4 2 construction required construction ti required 14.4 41.4 permit limit (16) 6.4 permit limit (46) 3 year average 36.6 3 year average 81.4 Medio Leon Dos Rios
WRC Capacities and Flows (mgd) October 29 thru March 21 14 Page 16 permit limit (125) 12 1 construction required 112.5 million gallons per day 8 6 4 2 construction required construction ti required 14.4 41.4 permit limit (16) 7.6 permit limit (46) 39.39 87.46 Medio Leon Dos Rios
WRC Capacities and Flows 216 - With 2 mgd transferred to Dos Rios 14 Page 17 permit limit (125) 12 1 transferred from Leon and MRSO million gallons per day 8 6 4 flows transferred to Dos Rios permit limit (46) 17 2 permit limit (16) 5.6 3 Medio Leon Dos Rios
Page 18 Why add to Dos Rios service area? Provides capacity for future flows from the new Medina River sewershed Eliminates current need for expansion at Leon WRC Defers need for planned future expansion at Medio WRC Lowest cost option
Goals for Dos Rios WRC Re-rating Maximize use of existing plant capacity Provide additional capacity when needed Be prepared for peak wet-weather weather events Minimize rate impacts through sequencing re-rating projects Page 19
Page 2 Dos Rios WRC Average Flows At 124 gallons per person per day, permit capacity reached in 223 At 116 gallons per person per day, permit capacity reached in 228 Flows (mgd) 16 14 12 Permit capacity 124 gpcd 116 gpcd 11 gpcd 1 8 6 4 Actual Increase due to Leon and Medio diversions 2 1988 1993 1998 23 28 213 218 223 228
Dos Rios WRC Re-rating Timeline Page 21 Dos Rios WRC re-rating" is a series of phased improvements Will result in 217 mgd capacity at Dos Rios Will also address some deficiencies in current infrastructure Total cost $163 million: includes design and construction (in 21 dollars) design construction
Comparative Costs for Recent Wastewater Treatment Plant Projects (in 21 dollars) Page 22 $ / gallon of capacity $16. $14. $12. $14.29 $1. $8. $6. $6.44 $4. $2. $. $1.77 $2.39 $3.75 $4.32 $4.33 Dos Rios WRC Rerating South Austin Regional Rerating Medio WRC Expansion North Texas Municipal Water District San Antonio River Authority City of Corpus Christi City of Boerne
Other Improvements at Dos Rios Total cost: $61,34,6 (in 21 dollars) Page 23 under construction design construction PROJECT 21 211 212 213 214 215 SLUDGE THICKENING AND AERATION SYSTEM IMPROVEMENTS TERTIARY FILTERS PHASE I DIGESTER IMPROVEMENTS AND MIXING SYSTEM ENHANCEMENTS - PHASE I DIGESTER IMPROVEMENTS AND MIXING SYSTEM ENHANCEMENTS - PHASE II DIGESTER IMPROVEMENTS AND MIXING SYSTEM ENHANCEMENTS - PHASE III DEWATERING FACILITY IMPROVEMENTS $6,134, $14,125,612 $1,272, $8,691, $7,74, $12,646, SCADA UPGRADE $1,462,
Page 24 Dos Rios WRC Re-rating separate existing Stages 1 and 2 to operate in parallel
Page 25 Treatment in the 198s That was then... Nov 17, 1983 Nov 1, 1983 Updated Master Plan for Water Recycling Nov 17, 1983 Centers
Wastewater Treatment Today This is now... Page 26 mexican stoneroller longear perch logperch SA Express-News June 13, 22 "Best in Texas" "Best in Nation" Permit Compliance Environmental Stewardship
Conclusions and Recommendations Page 27 Conservation will not continue to limit wastewater flow growth Dos Rios WRC is upgradable and has available biological capacity Proceed with Dos Rios WRC re-rating, headworks improvements and process enhancements project as planned Leon capacity achieved by transferring flow to MRSO and Dos Rios Delay future Medio expansions with flow transfers to Dos Rios Continually re-evaluate growth in flows in all three sewersheds and adjust Dos Rios WRC re-rating schedule as needed
Updated Master Plan for Water Recycling Centers Steve Clouse Chief Operating Officer