Regulatory & Research Aspects of the San Gabriel Valley Indirect Reuse Replenishment Project (IRRP)

Transcription

1 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

2 Outline Background Project Description Regulatory Compliance Soil Column Research Next Steps

3 Main San Gabriel Basin Covers 167 mi 2 Serves 1.4 million residents Serves 19 cities & communities Operates under an adjudication judgment

4 Upper San Gabriel Valley Municipal Water District Special district formed in mi 2 service area 900,000 served Provides supplemental water MWD member agency 200,000 AFY water demand

5 Spreading Grounds Used to Replenish the Main San Gabriel Basin 17 spreading grounds, covering 1,100 acres Recharged 153,000 AFY between % local runoff 27% imported

6 Baldwin Park Key Well Water Surface Elevation

7 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

8 Project Schedule 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

9 Initial Project Development Complete 9

10 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

11 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

12 TOC-Based Dilution Water Requirements

13 Volume-Based Dilution Water Requirements to Achieve 20% RWC

14 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

15 SAT Performance CEC Concentration, ng/l Pharmaceuticals 2ndry Cl2-Sat <28 10 <10 <10

16 SAT Performance CEC Antibiotics 2ndry Cl2-Sat Concentration, ng/l <10 <10 <10 Azrithromycin Erythromycin Sulfamethoxazole Trimethoprim

17 SAT Performance CEC Fire Retardants 2ndry 1000 Cl2-Sat Concentration, ng/l TCEP TCPP TDCPP

18 SAT Performance CEC Sweeteners 2ndry Cl2-Sat Cocnentration, ng/l Acesulfame-K Sucralose

19 SAT Performance CEC Household Chemicals 2ndry 1000 Cl2-Sat Concentration, ng/l <50 <50 <10 1 DEET Fipronil Glaxolide Tonalide Triclosan

20 SAT Performance CECs Comparison to State of the Science Report Health Based Criterion 20

21 SAT Performance DBPs Average HHAs TTHMs NDMA Influent 27 SAT Effluent < 1.0 Influent 25 SAT Effluent < 0.5 Influent 448 SAT Effluent <

22 SAT Performance Microbial Removal 22 Spiking Concentration: Total Coliform 1.2E+09, MS-2 virus 4.1E+11, Crytosporidium oocysts 3.6E+07

23 Project Area Nearest drinking water well is 2 years away

24 Candidate SAT Performance Indicators Soil Column Testing

25 Approved SAT Performance Indicators

26 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

27 Projected Groundwater Replenishment Costs

28 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

29 Extended Testing Data so far

30 Extended Testing Data so far Still waiting for water to exit SC2

31 DDW/RWQCB Approval Engineering Report (ER) January 2012 Initiated kick off meeting to prepare ER Sep 2014 First Submittal of ER Nov st comments from DDW July 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

32 Tasks 8-16: Underway 32

33 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

34 Questions Santa Fe Spreading Grounds (Source: Google Maps)