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UTILITY RATES STAKEHOLDERS COMMITTEE MEETING 1,2,3 – trichloropropane compliance

UTILITY RATES STAKEHOLDERS COMMITTEE MEETING 1,2,3 – trichloropropane compliance. February 21, 2018. agenda. Regulatory presentation by kassy Chauhan, P.E., state water resources control board Tcp technical memorandum, by alfonso manrique, Gouveia engineering

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UTILITY RATES STAKEHOLDERS COMMITTEE MEETING 1,2,3 – trichloropropane compliance

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  1. UTILITY RATES STAKEHOLDERS COMMITTEE MEETING 1,2,3 – trichloropropane compliance February 21, 2018

  2. agenda • Regulatory presentation by kassy Chauhan, P.E., state water resources control board • Tcp technical memorandum, by alfonso manrique, Gouveia engineering • PROPOSED CORRECTIVE ACTION PLAN, BY ALFONSO MANRIQUE, GOUVEIA ENGINEERING

  3. Regulatory OverviewKassy D. Chauhan, P.E.Senior Sanitary EngineerState Water Resource Control Board – Division of Drinking Water

  4. Regulatory presentationOVERVIEW • What is 1,2,3 – Trichloropropane? • Extent of Groundwater Contaminated with 123-TCP? • How much TCP is in our wells? • Compliance Determinations • What should I do until treatment is installed?

  5. What is 1,2,3-TCP? • Was used as industrial solvent and for degreasing • Was an ingredient in soil fumigants widely used for many decades • Moves to groundwater aquifer with little soil adsorption • Reasonably anticipated to be a human carcinogen • Added to the State’s List of chemicals known to cause cancer. • Based on long term exposure for a period of 70 years.

  6. Extent of Groundwater contaminated with 1,2,3-TCP? • 1,2,3-TCP Occurrence Data • 2001-2015 Occurrence data • 471 wells with confirmed detections above 5 parts per trillion (ppt) • Range of Detections: 5 ppt to >10,000 ppt (DLR is 5 ppt)

  7. Occurrence of 1,2,3-TCP

  8. Central Valley Sources with Average 1,2,3-TCP ConcentrationAbove 5 ppt(2001-2015)

  9. 1,2,3-TCP MCL • Maximum contaminant level (MCL) for 1,2,3-TCP established by SWRCB • Adopted by swrcb – December 14, 2017 • Effective January 1, 2018 • Establishes initial monitoring requirements • Commences in January 2018 • Establishes mcl of 0.005 ug/l • Provision for data substitution • Provisions for waivers

  10. City of Livingston’s Domestic Water Supply System – Historical data

  11. City of Livingston’s Domestic Water Supply System • Summary • All Wells Except Wells Nos. 11 and 15 are greater than 10 times the mcl • Every well is impacted by the new MCL • First quarterly sample by March 31, 2018 • All wells except well no. 11 and 15 will be out of compliance by april 1, 2018

  12. Compliance determinations • Wells with 1,2,3-tcp greater than 4x the MCL – Immediately out of compliance. • Wells with 1,2,3-TCP greater than the MCL – Commence with 6 months of monitoring

  13. SWRCB – Enforcement actions • SWRCB – DDW issues a compliance order to City of Livingston • Requires a correction action plan • Requires Quarterly progress reports • Requires Quarterly public notification • Requires Quarterly Proof of Public Notification • Establishes a Return to compliance date – typically three years from date of order

  14. What should we do? • Develop a public outreach plan • Residential treatment devices available • Schools • Special drinking water for schools grant funds available – grants • Request technical assistance to apply • Request alternate supply and/or treatment until the city is in compliance

  15. summary • City of Livingston will be out of compliance • SWRCB-DDW will issue compliance order • Public notification will be required to all residents • Will generate additional inquiries to the city • Will indicate there is an increased cancer risk • First notice – by April 30, 2018 • Return to compliance deadline will be determined – likely April 30, 2021 • Schools – Seek interim solution

  16. TCP Technical memorandumWATER DEMAND • How much water does the City use? • Average Day demand: 5.62 mgd (2017) • Maximum day demand: 11.04 mgd (2009) 7,669 GPM • Peak hour demand: 11,503 GPM Average water demand has decreased 17 percent since 2013!!

  17. TCP Technical memorandumWATER SUPPLY • What the SOURCE of the city’s supply? • 9 active wells • Storage tank and booster pumps

  18. Tcp technical memorandumWATER SUPPLY #16 #11 #8 #14 #9 #15 #13 1 MG STORAGE #17 #12

  19. Tcp technical memorandumWATER SUPPLY

  20. Proposed corrective action planOVERVIEW • What is the city doing to comply with the TCP Maximum contaminant level? • Existing: • Well no. 8 tcp removal treatment facility • Proposed: • Project no. 1 – centralized treatment at well #16 • Project no. 2 – centralized treatment at Arakelian park + storage tank • Project no. 3 – centralized treatment at well #8 + storage tank • Project no. 4 – surface water supply

  21. Proposed corrective action plan: existing facilities • Well No. 8 tcp removal treatment facility • One of the first tcp treatment facilities in the central valley • Capacity to treat 1,200 gpm • Uses granular activated carbon to remove tcp

  22. Proposed corrective action plan:project No. 1 – centralized treatment at well no. 16 • Description: • Construction of a four (4) train treatment system at well #16 • Construction of a pipeline from well #14 to Well #16 • Cost: $4.0 million • funding: source: dwsrf • Schedule to construction: completion by 2020 System’s supply capacity at completion: MDD: 3,400 GPM PHD: 4,400 GPM Not enough!

  23. Proposed corrective action plan:project No. 1 – centralized treatment at well no. 16 #16 #14

  24. Proposed corrective action plan:project No. 1 – centralized treatment at well no. 16

  25. Proposed corrective action plan:project No. 2 – centralized treatment at Arakelian park • Description: • Construction of a six (6) train treatment system at Arakelian park • Construction of a pipeline from well #13 to Arakelian park • construction of a pipeline from well #17 to Arakelian park • Construction of a 1.5 million gallon storage tank • Construction of a booster pump station with 6,000 gpm capacity

  26. Proposed corrective action plan:project No. 2 – centralized treatment at Arakelian park • Cost: $8.5 million • funding: source: dwsrf • Schedule to construction: completion by 2021 System’s supply capacity at completion: MDD: 6,500 GPM PHD: 10,400 GPM Close but Not enough!

  27. Proposed corrective action plan:project No. 2 – centralized treatment at Arakelian park #13 ARAKELIAN PARK 1.5 MG STORAGE #17

  28. Proposed corrective action plan:project No. 2 – centralized treatment at Arakelian park

  29. Proposed corrective action plan:project No. 3 – centralized treatment at well no. 8 • Description: • Construction of two (2) additional treatment trains at well No. 8 • Construction of a pipeline from well #9 to well No. 8 • Construction of a 1.5 million gallon storage tank • Construction of a booster pump station with 4,500 gpm capacity

  30. Proposed corrective action plan:project No. 3 – centralized treatment at well no. 8 • Cost: $3.5 million • funding: source: dwsrf • Schedule to construction: completion by 2021 System’s supply capacity at completion: MDD: 7,800 GPM PHD: 14,900 GPM enough!

  31. Proposed corrective action plan:project No. 3 – centralized treatment at well no. 8 #8 1.5 MG STORAGE #9

  32. Proposed corrective action plan:project No. 4 – surface water treatment • Description: • Construction of a horizontal collector well near the river • Construction of RAW WATER transmission pipeline • Construction of a 3.0 MGD surface water treatment plant • Construction of a TREATED WATER TRANSMISSION pipeline to well no. 8 storage tank

  33. Proposed corrective action plan:project No. 4 – surface water treatment • Cost: $14 million • funding: source: dwsrf • Schedule to construction: completion by 2030 System’s supply capacity at completion: MDD: 9,900 GPM PHD: 14,900 GPM Enough until 2040!

  34. Proposed corrective action plan:project No. 4 – surface water treatment RIVER INTAKE SWTP #8

  35. Proposed corrective action plan:summary

  36. Proposed corrective action plan:summary PHD MDD

  37. Questions? For any further information please contact alfonso manrique: Phone (559) 473-1371 Ext. 101 E-mail: AMANRIQUE@GOUVEIAENGINEERING.COM

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