TRA/DCURD Reclaimed Water System

Transcription

1 TRA/DCURD Reclaimed Water System Looking Back and Moving Forward with Successes and Challenges of the First Major Direct Reuse Program in Texas Ellen McDonald, Alan Plummer Associates January 21, 2011

2 Some history Pictures from A History of Las Colinas, Las Colinas Association: accessed 1/18/11

3 Some history Pictures from A History of Las Colinas, Las Colinas Association: accessed 1/18/11

4 Las Colinas (City of Irving)

5 TRA/DCURD Reuse System Las Colinas Started delivering water in miles of pipeline 15 pump stations 56 lakes Two separate distribution systems TRA CRWS Plant

6 TRA Central Regional Wastewater System Serves ~1.3 million people in Dallas/Fort Worth area Permitted capacity of 162 MGD Current permit limits: BOD 7 mg/l TSS 15 mg/l NH3 2 mg/l (Apr Nov) 4 mg/l (Dec Mar)

7 District Water Rights Lake Remle 1,100 acre-feet per year from Elm Fork, junior to City of Dallas 221 acre-feet per year from Elm Fork (from riparian right) Lake Carolyn Water from these rights is supplemented with reclaimed water to provide for evaporation make up and other nonpotable water uses

8 DCURD Customers DCURD Other Customers Evaporative Make up Las Colinas Country Club Irrigation Open Spaces Las Colinas Sports Club The Las Colinas Association (TLCA) Hackberry Creek Country Club Verizon Median Southwestern Bell Rochelle Median Verizon Urban Center System Realty 15 Exxon Mobile Exxon Mobile N. Royal Ln. Median Citigroup Blue Bonnet Hill Polo Fields Island Greens Northlake College Las Colinas/Buffalo Blvd. Medians OPUS South La Villita Fluor Corporation Uplift Education Irving Convention Center

9 Reclaimed Water Usage Peak monthly avg = 5.3 MGD MG/month Oct 10 Jul 10 Apr 10 Dec 09 Sep 09 Jun 09 Mar 09 Nov 08 Aug 08 May 08 Jan 08 Oct 07 Jul 07 Apr 07 Dec 06 Sep 06 Jun 06 Feb 06 Nov 05 Aug 05 May 05 Jan 05

10 Reclaimed Water Usage MG/year

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12 February 1994 State discharge permit issued by TNRCC Lake Remle addressed in other requirements section as transfer of reclaimed water for purpose of reuse Specified required quality, quantity and flow Requirement of 1:10 ratio of reclaimed water to fresh water established, but subsequently deleted by endorsement (responsibility assigned to user per Ch. 310)

13 What else happened in February 1994? Jeff Gillooly (Tanya Harding s ex-husband) pleads guilty for his role in attacking figure skater Nancy Kerrigan.

14 June 1995 NPDES permit issued by EPA Regulated discharges to Lake Remle as Outfall 002 Described as discharging to Lake Remle, thence to Hackberry Creek Lake Segment I; thence to Lake Carolyn; thence with the possibility of discharge to the Elm Fork Trinity River Limited quantity and flow rate and required discharge to be chlorinated Biomonitoring only applied to Outfall 001, but included reopener clause

15 What else happened in June 1995? United States Air Force Captain Scott O'Grady's F-16 is shot down over Bosnia while patrolling the NATO nofly zone

16 May 1997 Chapter 210 reclaimed water authorization issued to TRA and DCURD by TCEQ Authorizes reuse of effluent for landscape irrigation, maintenance of water features and other Type I or II uses in DCURD service area Includes specific language related to allowable pond discharge conditions

17 What else happened in May 1997? IBM's Deep Blue chess-playing supercomputer defeats Garry Kasparov in the last game of the rematch, becoming the first computer to beat a world-champion chess player.

18 March 2000 TPDES permit issued by TCEQ Transfer of reclaimed water to Lake Remle addressed in other requirements EPA did not comment Only quantity and flow rate regulated

19 What else happened in March 2000? Vladimir Putin is elected President of Russia

20 August 2002 Application to renew and amend TPDES permit submitted to TCEQ

21 What else happened in August 2002? The Tandy Center Subway in Fort Worth, Texas, ceases to operate.

22 December 2006 Draft permit provided to EPA EPA expressed concern about how discharge to Lake Remle was addressed

23 What else happened in December 2006? Saddam Hussein was executed.

24 February 2008 TPDES permit issued by TCEQ Included daily and annual flow limits Included requirement for Lake Remle study Objectives of study were to improve water quality model and do water quality assessment to determine appropriate aquatic life use

25 What else happened in February 2008? Fidel Castro resigns as President of Cuba

26 February 2008 present Work plan approved and data collection/analysis and model improvements performed Lake Remle System Assessment report submitted to TCEQ (Nov. 2010) Meeting with TCEQ to obtain feedback on report recommendations for aquatic life use (Dec. 2010) Meeting with TCEQ modelers to review changes to model (Dec. 2010) Preliminary comments have been received on model Waiting on TCEQ decision related to aquatic life use

27 Questions?