Regulatory & Research Aspects of the San Gabriel Valley Indirect Reuse Replenishment Project (IRRP) CA-NV AWWA AFC15 Session 12A Research 10:00 am October 28, 2015
Outline Background Project Description Regulatory Compliance Soil Column Research Next Steps
Main San Gabriel Basin Covers 167 mi 2 Serves 1.4 million residents Serves 19 cities & communities Operates under an adjudication judgment
Upper San Gabriel Valley Municipal Water District Special district formed in 1960 144 mi 2 service area 900,000 served Provides supplemental water MWD member agency 200,000 AFY water demand
Spreading Grounds Used to Replenish the Main San Gabriel Basin 17 spreading grounds, covering 1,100 acres Recharged 153,000 AFY between 1999-2009 73% local runoff 27% imported
Baldwin Park Key Well Water Surface Elevation
Indirect Reuse Replenishment Project (IRRP) Reduces dependence on imported water 25% 10,000 AFY yield Appx. $60M Appx. 9 miles of > 36 diameter pipeline Pump station
Project Schedule 2011 2012 2013 2014 2015 2016 2017 2018 2019 Immediate Work Tasks Task 1 Agency Coordination Task 2 Land And Right of Way Requirements Task 3 Regulatory Compliance Task 4 Optimization of Treatment Technologies Task 5 Project Cost Estimate Task 6 Funding Plan Task 7 Preliminary Project Report Project Completion Work Tasks Task 8 Public Outreach Task 9 Finalize Funding Plan Task 10 Update Environmental (CEQA/NEPA) Task 11 CDPH / RWQCB Approval (Engineer's Report) Task 12 Obtain Right of Way Task 13 Update Design Task 14 Bid Project Task 15 Construction Task 16 Operations
Initial Project Development Complete 9
Where to Start? Tertiary Replenishment With Soil Aquifer Treatment (SAT) Full Advanced Treatment (FAT) Spreading facilities Blend Requirements Boundary constraints? Spreading facilities Injection Brine line disposal Energy and Capital 10
Research Efforts for Treatment Technology Optimization WateReuse 11-02: Equivalency of Advanced Treatment Train for Potable Reuse WateReuse 12-12: Enhancing the Soil Aquifer Treatment Process for Potable Reuse Foundational Actions Funding: Low Cost Alternative Treatment Technologies for Indirect Reuse Replenishment Project Extended Testing: Soil column testing to assess NDMA, CEC and TOC attenuation with extended residence times
TOC-Based Dilution Water Requirements
Volume-Based Dilution Water Requirements to Achieve 20% RWC
TOC-Based Dilution Water Requirements Soil Column Testing 44% Removal in 30 days - Additional TOC removal is expected with travel time. 5 days 25 days
SAT Performance CEC Concentration, ng/l 10000 1000 100 Pharmaceuticals 2ndry Cl2-Sat <28 10 <10 <10
SAT Performance CEC 10000 Antibiotics 2ndry Cl2-Sat Concentration, ng/l 1000 100 10 <10 <10 <10 Azrithromycin Erythromycin Sulfamethoxazole Trimethoprim
SAT Performance CEC 10000 Fire Retardants 2ndry 1000 Cl2-Sat Concentration, ng/l 100 10 1 TCEP TCPP TDCPP
SAT Performance CEC 100000 Sweeteners 2ndry Cl2-Sat 10000 Cocnentration, ng/l 1000 100 10 Acesulfame-K Sucralose
SAT Performance CEC 10000 Household Chemicals 2ndry 1000 Cl2-Sat Concentration, ng/l 100 10 <50 <50 <10 1 DEET Fipronil Glaxolide Tonalide Triclosan
SAT Performance CECs Comparison to 11-02 State of the Science Report Health Based Criterion 20
SAT Performance DBPs Average HHAs TTHMs NDMA Influent 27 SAT Effluent < 1.0 Influent 25 SAT Effluent < 0.5 Influent 448 SAT Effluent < 2.0 21
SAT Performance Microbial Removal 22 Spiking Concentration: Total Coliform 1.2E+09, MS-2 virus 4.1E+11, Crytosporidium oocysts 3.6E+07
Project Area Nearest drinking water well is 2 years away
Candidate SAT Performance Indicators Soil Column Testing
Approved SAT Performance Indicators
Regulatory Criteria Surface Application of Disinfected Tertiary Water from San Jose Creek WRP Sufficient blending water to meet 20% RWC (Volume-based) With 6 months of subsurface travel, potential RWC > 20% (TOC-based) Suite of CECs, NDMA, THMs, HAAs completely attenuated through SAT Total nitrogen << 10 mg/l (as N) after SAT Microbes attenuated through SAT: >8-log virus & bacteria, >9-log cryptosporidium 26
Projected Groundwater Replenishment Costs
Extended Testing Continue to operate chlorinated soil columns Soil column 1 is operated at 1 month detention time Soil column 2 is operated at 5 month detention time Operation began in January 2015 Will achieve steady state next year Collecting TOC, UVA, DO, ORP, ph, Turbidity Quarterly sampling of EEM, CECs and NDMA
Extended Testing Data so far
Extended Testing Data so far Still waiting for water to exit SC2
DDW/RWQCB Approval Engineering Report (ER) January 2012 Initiated kick off meeting to prepare ER Sep 2014 First Submittal of ER Nov 2014 1 st comments from DDW July 2015 2 nd comments Sep 2015 response to 2 nd comments Oct 2015 DDW is satisfied with ER Final DDW Acceptance anticipated in winter 2016 after public hearing RWQCB permit to follow
Tasks 8-16: Underway 32
Acknowledgements CA Department of Public Health LA Regional Water Quality Control Board Sanitation Districts of Los Angeles County Main San Gabriel Basin Watermaster Trussell Technologies Stetson Engineering Nellor Environmental Associates WateReuse Research Foundation
Questions Santa Fe Spreading Grounds (Source: Google Maps)