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Home My WebLink AboutDERR-2024-008205Mark Atencio March 2010 Sulfate (mg/L) Plume Secondary Drinking Water Standard Great Salt Lake 800 250 7,000 Selenium and Mercury •Naturally occurring •Not related to mining activities •Need to address these issues End of Pipeline to Lake Water •Habitat is created by pipeline discharge when lake level is low •Need to address this issue Project Accomplishes •Sulfate contained and relocated •Drinking water produced •Aquifer remediated Photo by CDSD One of Great Salt Lake’s Beneficial Uses: water-oriented wildlife and their necessary food chain Permit limits structured to protect wildlife Great Salt Lake Discharge •Water quality •Discharge scenarios •Pipeline alignment •Discharge location •Monitoring expectation Water Quality JVWCD Discharge Existing Gilbert Bay Existing Jordan River Jordan River Standard Secondary Drinking Water Standard 10,746 80,000 – 100,000 1,100 1,200 500 Total Dissolved Solids (TDS) (mg/L –ppm) Sampling Location Gilbert Bay JVWCD Discharge Existing Gilbert Bay Existing Jordan River Jordan River Standard Primary Drinking Water Standard 55 0.6 2 4.6 50 Selenium (ug /L -ppb) JVWCD Discharge Existing Gilbert Bay Existing Jordan River Jordan River Standard Primary Drinking Water Standard 1.2 25 25 0.012 2 Mercury (ug /L -ppb) Discharge Scenarios No Deep Well Discharge to Jordan River No By-product Discharge to Jordan River Deep Well Discharge to Great Salt Lake By -product Discharge to Great Salt Lake UVBAG FILTER 11.0 ug/L Selenium (80th Percentile of 3,081 Data points with 5% tails discarded.) 2,200 mg/L TDS 3.0 MGD 44.7 ug/L Selenium 1.12 lbs/day 250 mg/L TDS BLEND BYPRODUCT PRODUCT RO RO 4 Trains DEEP WELLS SHALLOW WELLS 3 Pumps Pumping Well PROCESS FLOW DIAGRAM Normal Operation To Gilbert Bay, Great Salt Lake To Municipal Water System2 Trains To Jordan River 7.9 ug/L Selenium (80th Percentile of 12 data points.) 1,100 mg/L TDS UVBAG FILTER 7.9 ug /L Selenium (80th Percentile of 12 data points.) 1,100 mg/L TDS 4.8 MGD 11 ug/L Selenium 0.44 lbs/day 250 mg/LTDS BLEND OVERFLOW OVERFLOW BYPRODUCT PRODUCT RO RO 4 Trains DEEP WELLS SHALLOW WELLS 3 Pumps Pumping Well PROCESS FLOW DIAGRAM Start-up To Gilbert Bay, Great Salt Lake To Municipal Water System2 Trains To Jordan River Scenario will occur during initial start-up and after power failure for approximately a 24 hour period 11.0 ug/L Selenium (80th Percentile of 3,081 data points with 5% tails discarded.) 2,200 mg/L TDS 12.1 MGD (19 cfs) Jordan River flow range: 30 cfs to 900 cfs UVBAG FILTER 4.9 MGD 27.1 ug/L Selenium 1.11 lbs/day 250 mg/LTDS BLEND OVERFLOW BYPRODUCT PRODUCT RO RO 4 Trains DEEP WELLS SHALLOW WELLS 3 Pumps Pumping Well PROCESS FLOW DIAGRAM Cleaning and Maintenance Deep RO To Gilbert Bay, Great Salt Lake To Municipal Water System2 Trains To Jordan River 11 ug/L Selenium (80th Percentile of 3,081 Data points with 5% tails discarded.) 2,200 mg/L TDS 7.9 ug /L Selenium (80th Percentile of 12 data points.) 1,100 mg/l TDS Scenario will occur every three months for approximately a 24 hour period UVBAG FILTER 11.0 ug/L Selenium (80th Percentile of 3,081 Data points with 5% tails discarded.) 2,200 mg/L TDS 1.0 MGD 55.0 ug/L Selenium 0.46 lbs/day 250 mg/L TDS BLEND BYPRODUCT PRODUCT RO RO 4 Trains DEEP WELLS SHALLOW WELLS 3 Pumps Pumping Well PROCESS FLOW DIAGRAM Cleaning & Maintenance Shallow RO To Gilbert Bay, Great Salt Lake To Municipal Water System2 Trains To Jordan River 7.9 ug/L Selenium (80th Percentile of 12 data points.) 1,100 mg/L TDS OVERFLOW Scenario will occur every three months for approximately a 24 hour period 12.1 MGD (19 cfs) Jordan River flow range: 30 cfs to 900 cfs No Deep Well Discharge to Jordan River No By-product Discharge to Jordan River Deep Well Discharge to Great Salt Lake By -product Discharge to Great Salt Lake Shallow Well Discharge to Jordan River 2% of the time (non-impacted groundwater) By -product Discharge to Great Salt Lake 2% -55.0 ug /L Se 98% -44.7 ug /L Se Pipeline Alignment Discharge Location Discharge Location Criteria 1.Avoid key wildlife habitat areas 2.Avoid human high use areas 3.Consider areas already impacted 4.Don’t create a new obstacle Discharge Location Discharge Location Discharge Location Discharge Location Discharge Location End of Pipeline – Discharge Structure Monitoring Expectation JVWCD Expects the UPDES Permit to have Monitoring Requirements Monitoring Likely to Include: •Water Quality •Invertebrates •Bird Eggs JVWCD is sensitive to the number of bird eggs required to be sampled Summary Problem – Unusable Groundwater Solution – Wells and Treatment Plant By-product – Discharge will be Monitored Discharge Location Discharge Monitoring to address: •Potential selenium impacts •Potential mercury impacts •End of pipeline wetland habitat Result – 1) Hundreds of Drinking Water Wells Protected Result – 2) Aquifer is Remediated Final Design Modeled Pumping ScenarioFinal Design Modeled Pumping Scenario 40 Year Simulation40 Year Simulation Result – 3) New Water Supply Produced for the Public What We Should Know •Plume Exists •Plume is Moving towards Jordan River and Great Salt Lake •Groundwater currently unusable Do Nothing Alternative •Plume Migrates into Hundreds of Existing Drinking Water Wells •Plume Migrates into Jordan River •Plume Migrates into Great Salt Lake Wetlands •Plume Migrates into Farmington Bay •Plume Migrates into Great Salt Lake Project Alternative •Hundreds of Existing Drinking Water Wells are Protected •Jordan River By-passed •Great Salt Lake Wetlands By-passed •Farmington Bay By-passed JVWCD Web Site •Google “Jordan Valley Water” •www.jvwcd.org •Click on logo