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Place ID 250700
  
  
  
  
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General Information
Region Place ID Place Name Place Type Place Address Place County
4 250700 Pomona Water Reclamation Plant Wastewater Treatment Facility 295 Humane Pomona, CA, 91766 Los Angeles

Expand/Contract Related Parties
Related Parties
Party Party Type Party Name Role Classification Relationship Start Date Relationship End Date
642265 Person Michael Flores Is A Data Submitter For 10/31/2023
640467 Person Marisol Cira Is A Data Submitter For 07/10/2023
639812 Person Vincenzo Ciancia Is A Data Submitter For 06/01/2023
636288 Person Syljohn Estil Is A Data Submitter For 11/22/2022
626562 Person Thomas Alek Parker Is A Data Submitter For 11/22/2022
630002 Person Preeti Ghuman Is A Data Submitter For 12/27/2021
626784 Person Sarah Miles Is A Data Submitter For 08/11/2021
626009 Person James Michael Grunwald Is A Data Submitter For 07/06/2021
335123 Person Monica Sanchez Is Onsite Manager For 06/15/2021
546435 Person Lysa Anaiis Gaboudian Is Onsite Manager For 04/05/2021
621839 Person Rita Chang Is A Data Submitter For 02/05/2021
25175 Organization Los Angeles Cnty Sanitation Districts Owner Special District 09/18/2020
595992 Person Katie Marjanovic Is A Data Submitter For 09/08/2020
610975 Person Elizabeth Roswell Is A Data Submitter For 07/14/2020
609761 Person Holly Jones Is A Data Submitter For 06/02/2020
601637 Person Stefan Szalkowski Is A Data Submitter For 09/03/2019
598636 Person Qin Liu Is A Data Submitter For 06/14/2019
592486 Person Suzanne Brown Is A Data Submitter For 04/18/2019
580129 Person Mandy Ng Is A Data Submitter For 08/29/2018 07/06/2021
579020 Person Jessica Lau Is A Data Submitter For 06/12/2018 07/06/2021
314909 Person Nicholas Smal Is A Data Submitter For 12/06/2017 02/05/2021
569529 Person Ryan Honda Is A Data Submitter For 11/15/2017 07/06/2021
314901 Person Erika Bensch Is Onsite Manager For 04/06/2017
562444 Person John Stephen Shay Is A Data Submitter For 02/10/2017
562298 Person Steven H Ono Is A Data Submitter For 02/09/2017 05/10/2018
546435 Person Lysa Anaiis Gaboudian Is A Data Submitter For 02/01/2017 04/05/2021
559683 Person Monisha Brown Is A Data Submitter For 11/08/2016 05/01/2020
558391 Person Nicholas Wiehardt Is A Data Submitter For 07/28/2016
556260 Person Naoko Munakata Is Onsite Manager For 06/23/2016 04/30/2021
555508 Person Donald Ton Is A Data Submitter For 04/22/2016 07/06/2021
522297 Person Andrew Hall Is Onsite Manager For 06/01/2015 04/06/2017
522297 Person Andrew Hall Is A Data Submitter For 05/28/2015 05/28/2015
550383 Person Christina Pottios Is A Data Submitter For 03/11/2015 07/20/2021
550333 Person Verna Diaz Is A Data Submitter For 03/09/2015 07/20/2021
550152 Person Misty Brown Is A Data Submitter For 02/19/2015
548915 Person Carlita Barton Is A Data Submitter For 02/18/2015
550106 Person Joshua Westfall Is A Data Submitter For 02/17/2015
550102 Person Amy De Smet Is A Data Submitter For 02/13/2015 07/20/2021
542945 Person Matt Copeland Is A Data Submitter For 09/10/2013 06/14/2019
537360 Person Grace Robinson Hyde Contact 02/09/2012
528546 Person Russell Yoshida Is A Data Submitter For 09/16/2011 10/31/2023
467638 Person Kristy Monji Is A Data Submitter For 07/14/2011 07/23/2012
526480 Person George Gallis Is A Data Submitter For 04/05/2011 07/25/2017
522299 Person Jodie Lanza Is A Data Submitter For 05/05/2010 05/06/2014
522294 Person Karen Elliott Is A Data Submitter For 05/05/2010 07/06/2021
521733 Person Ken Hoffman Is A Data Submitter For 05/05/2010 07/23/2012
522296 Person Francisco Guerrero Is A Data Submitter For 05/05/2010 11/15/2013
522295 Person Shannon Bishop Is A Data Submitter For 05/05/2010 01/15/2019
522290 Person Kurt Rinaldi Is A Data Submitter For 05/05/2010 08/12/2015
522297 Person Andrew Hall Is A Data Submitter For 05/05/2010 11/15/2013
521731 Person Peter Navas Is A Data Submitter For 05/05/2010
521717 Person Gary Salva Is A Data Submitter For 05/05/2010 02/08/2013
521719 Person Abder Yacoby Is A Data Submitter For 05/05/2010 08/11/2023
522293 Person Esther Cantu Is A Data Submitter For 05/05/2010
522298 Person Brittany Liu Is A Data Submitter For 05/05/2010 05/19/2017
314898 Person Chris Wissman Is A Data Submitter For 04/08/2010 07/15/2020
521718 Person Angel Miramontes Is A Data Submitter For 03/18/2010 07/20/2021
521628 Person Mike Sullivan Is Onsite Manager For 03/16/2010 05/28/2015
308868 Person Thomas Weiland Is Onsite Manager For 03/16/2010 02/08/2013
459581 Organization Joint Outfall System Owner and Operator Special District 06/04/2009
400137 Person Susan Bremser Is A Data Submitter For 09/24/2007 09/04/2019
375146 Person Robert Asgian Is Onsite Manager For 04/24/2007 01/16/2013
375148 Person Raina Savova Is A Data Submitter For 04/24/2007 01/15/2013
335123 Person Monica Sanchez Is A Data Submitter For 07/27/2006
335209 Person LACSD Tech2 Is A Data Submitter For 07/27/2006 07/23/2012
335208 Person LACSD Tech1 Is A Data Submitter For 07/27/2006 07/23/2012
335207 Person LACSD Engineer2 Is A Data Submitter For 07/27/2006 07/23/2012
335206 Person LACSD Engineer1 Is A Data Submitter For 07/27/2006 07/23/2012
335205 Person Shelli St. Clair Is A Data Submitter For 07/27/2006 06/01/2009
335196 Person Francis Garrett Is A Data Submitter For 07/27/2006 03/12/2013
335195 Person Earle Hartling Is A Data Submitter For 07/27/2006 05/06/2014
335173 Person Phil Markle Is A Data Submitter For 07/27/2006 10/31/2023
334818 Person Ray Tremblay Is Onsite Manager For 07/26/2006 09/07/2010
334656 Person Bob Asgian Is Onsite Manager For 07/25/2006 02/08/2013
334657 Person Brian Louie Is Onsite Manager For 07/25/2006 09/07/2010
314667 Person Kristen Ruffell Is A Data Submitter For 06/21/2006 09/07/2010
314911 Person Obed Bejar Is A Data Submitter For 05/08/2006 07/23/2012
314909 Person Nicholas Smal Is A Data Submitter For 05/08/2006 07/23/2012
314903 Person Frank Garcia Is A Data Submitter For 05/08/2006 07/06/2021
314905 Person Kathy Green Is A Data Submitter For 05/05/2006 07/23/2012
314916 Person Shawn Cleaver Is A Data Submitter For 05/05/2006 07/23/2012
314899 Person Christian Alarcon Is A Data Submitter For 05/05/2006 07/13/2012
314907 Person Michael Hoxsey Case Worker 05/05/2006
303050 Person Ann Heil Is Onsite Manager For 05/03/2006 07/01/2021
25175 Organization Los Angeles Cnty Sanitation Districts Operator Special District 07/23/1979 02/24/2008
Total Related Parties: 85

Expand/Contract Regulatory Measures
Regulatory Measures
Reg Measure ID Reg Measure Type Region Program Order No. WDID Effective Date Expiration Date Status Amended?
260819 Letter 4 WDR 2 Historical N
260582 Letter 4 WDR 1 Historical N
432902 NPDES Permit 4 NPDMUNILRG R4-2021-0097 4B190107019 08/01/2021 07/31/2026 Active N
440309 Co-Permitee SB SLIC 2020-0015-DWQ 4B190107019 07/09/2020 Active N
395506 NPDES Permit 4 NPDMUNILRG R4-2014-0212 4B190107019 01/01/2015 12/31/2019 Historical Y
389835 13267 Letter (Non-Enforcement) 4 NPDMUNILRG R4-2009-0076 4B190107019 01/30/2013 Historical N
369524 NPDES Permit 4 NPDMUNILRG R4-2009-0076 4B190107019 07/24/2009 05/10/2014 Historical N
132991 NPDES Permit 4 NPDMUNILRG R4-2004-0099 4B190107019 07/30/2004 07/30/2009 Historical Y
136298 NPDES Permit 4 NPDMUNILRG 95-078 4B190107019 06/12/1995 05/10/2000 Historical Y
134064 NPDES Permit 4 NPDMUNILRG 89-096 4B190107019 09/25/1989 08/10/1994 Historical N
134001 NPDES Permit 4 NPDMUNILRG 84-080 4B190107019 09/17/1984 08/10/1989 Historical N
134831 Reclamation Requirements 4 REC 81-034 4B190107017 07/27/1981 07/27/1984 Active Y
133749 NPDES Permit 4 NPDMUNILRG 79-121 4B190107019 07/23/1979 07/10/1984 Historical N
Total Reg Measures: 13

Expand/Contract Violations
Violations
Violation ID Occurred Date Violation Type (-) Violation Description Corrective Action Status Classification Source
1125029 01/08/2024 Order Conditions An unauthorized recycled water discharge of a maximum of 9,000 gallons occurred on January 8 from roughly 7:10 a.m. to 7:30 a.m. at the Sanitation Districts' Spadra Landfill located at 4125 West Valley Boulevard in the city of Walnut. The Sanitation Districts notified the Regional Board at 3:45 p.m. on January 8, with a follow up letter on January 12. The unauthorized discharge originated from a below-grade recycled water distribution line near Bench 5 of the landfill on the southwestern side of the facility. The discharge occurred due to a crack in a Victaulic pipe connection fitting which allowed the line to separate, discharging recycled water into the soil. The pipe separation led to surface runoff downslope and into the storm drain prior to the pipeline being isolated. The leak was observed at approximately 7:10 a.m. on January 8, and continued until approximately 7:30 a.m. the same day, when site staff isolated the line. Recycled water was discharged into the soil until it became saturated, emanated from the surface and began to flow approximately 400 feet down the bench road before entering a catch basin. The discharge then flowed another approximately 600 feet before entering a Los Angeles County Department of Public Works storm drain. This storm drain ultimately discharges into the San Jose Creek. The recycled water produced at the Pomona WRP is suitable for discharge to the San Jose Creek per its National Pollutant Discharge Elimination System permit (Order No. R4-2021-0097), therefore no impacts to public health or the environment are expected. Staff reported that there was little flow in the San Jose Creek channel and there were no indications that fish or wildlife had been adversely impacted; therefore, there were no observed biological impacts from the discharge. To minimize reoccurrence of similar events, the Sanitation Districts will investigate the installation of above-grade recycled water lines and initiate a Victaulic fitting inspection program. To minimize reoccurrence of similar unauthorized recycled water discharge events, the Sanitation Districts will investigate the installation of above-grade recycled water lines and initiate a Victaulic fitting inspection program. Violation U eSMR
1125030 01/04/2024 DMON Per Section I of the MRP, recycled water samples shall be analyzed daily for total coliform. The total coliform result in the recycled water sample collected on January 4 was invalidated due to a laboratory error in which the analyst left the bacterial culture tubes outside of the incubator after the 24-hours read time. All other coliform results for the month were either non-detect or 1 CFU/100 mL, therefore, this result was expected to be within normal ranges. Laboratory staff were reminded of proper procedures. Per Section I of the MRP, recycled water samples shall be analyzed daily for total coliform. The total coliform result in the recycled water sample collected on January 4 was invalidated due to a laboratory error in which the analyst left the bacterial culture tubes outside of the incubator after the 24-hours read time. All other coliform results for the month were either non-detect or 1 CFU/100 mL, therefore, this result was expected to be within normal ranges. Laboratory staff were reminded of proper procedures. Violation U eSMR
1122428 10/11/2023 DMON Per Section I of the MRP, recycled water samples shall be analyzed daily for total coliform. The total coliform result in the recycled water sample collected on October 11 was invalidated because of improper sample incubation procedure. The analyst failed to write down the read time on the lab bench sheet and was unable to verify the correct duration of the incubation period. Throughout the month, the coliform results were typically non-detectable, except for five separate instances in which it was recorded at 1 CFU/100mL. Therefore, this result was expected to be within normal range and in compliance with the WRRs. To prevent a recurrence of this issue, Laboratory staff will double check that the sample data is properly filled out on the bench sheet. Per Section I of the MRP, recycled water samples shall be analyzed daily for total coliform. The total coliform result in the recycled water sample collected on October 11 was invalidated because of improper sample incubation procedure. The analyst failed to write down the read time on the lab bench sheet and was unable to verify the correct duration of the incubation period. Throughout the month, the coliform results were typically non-detectable, except for five separate instances in which it was recorded at 1 CFU/100mL. Therefore, this result was expected to be within normal range and in compliance with the WRRs. To prevent a recurrence of this issue, Laboratory staff will double check that the sample data is properly filled out on the bench sheet. Violation U eSMR
1121673 09/23/2023 DMON Per Section I of the MRP, recycled water samples shall be analyzed daily for total coliform. The total coliform result in the recycled water sample collected on September 23 was invalidated because of improper sample incubation procedure. Throughout the month, the coliform results were typically non-detectable, except for one instance in which it was recorded at 2 CFU/100 mL and three other separate instances where it was recorded at 1 CFU/100 mL. Therefore, this result was expected to be within normal range. To prevent a recurrence of this issue, Laboratory senior staff revisited the procedure with the analyst. Per Section I of the MRP, recycled water samples shall be analyzed daily for total coliform. The total coliform result in the recycled water sample collected on September 23 was invalidated because of improper sample incubation procedure. Throughout the month, the coliform results were typically non-detectable, except for one instance in which it was recorded at 2 CFU/100 mL and three other separate instances where it was recorded at 1 CFU/100 mL. Therefore, this result was expected to be within normal range. To prevent a recurrence of this issue, Laboratory senior staff revisited the procedure with the analyst. Violation U eSMR
1120968 08/21/2023 DMON Per Section I of the MRP, recycled water samples shall be analyzed daily for total coliform. The total coliform result in the recycled water sample collected on August 21 was invalidated because the bacterial plate was discarded by the lab analyst before confirming two colonies. All other coliform results for the month were either non-detect or, in one occurrence, 2 CFU/100 mL, therefore, this result was expected to be within normal ranges. To prevent a recurrence of this issue, Laboratory senior staff revisited the procedure with the analyst. Per Section I of the MRP, recycled water samples shall be analyzed daily for total coliform. The total coliform result in the recycled water sample collected on August 21 was invalidated because the bacterial plate was discarded by the lab analyst before confirming two colonies. All other coliform results for the month were either non-detect or, in one occurrence, 2 CFU/100 mL, therefore, this result was expected to be within normal ranges. To prevent a recurrence of this issue, Laboratory senior staff revisited the procedure with the analyst. Violation U eSMR
1120972 07/24/2023 DMON Per Section 4 of the MRP, effluent samples shall be analyzed daily for Total Residual Chlorine. The Total Residual Chlorine result from the effluent sample collected on July 24 was invalid because the sample was not analyzed within the appropriate laboratory holding time. A make-up sample could not be collected due to lack of effluent flow after initial collection. Laboratory staff have reviewed procedures for tracking samples during handling and to complete analyses within the required holding time in the future. During this period, the Pomona WRP was operating under normal conditions; thus, this parameter is expected to be within normal range on this day. Per Section 4 of the MRP, effluent samples shall be analyzed daily for Total Residual Chlorine. The Total Residual Chlorine result from the effluent sample collected on July 24 was invalid because the sample was not analyzed within the appropriate laboratory holding time. A make-up sample could not be collected due to lack of effluent flow after initial collection. Laboratory staff have reviewed procedures for tracking samples during handling and to complete analyses within the required holding time in the future. During this period, the Pomona WRP was operating under normal conditions; thus, this parameter is expected to be within normal range on this day. Violation B eSMR
1120040 06/07/2023 DMON Per Section 8.1 of the MRP, samples shall be collected semiannually for Mercury. Due to laboratory oversight, samples collected on June 7 from receiving water stations RSW-001D (R-A), RSW-002D (R-C) and RSW-003D (R-D) were invalidated because an older analytical method was used analyze the samples. To prevent this oversight from reoccurring, laboratory personnel have updated internal procedures to specify the correct sampling method for mercury. Make-up samples were collected on July 20, 2023 and results will be included in the July report. Per Section 8.1 of the MRP, samples shall be collected semiannually for Mercury. Due to laboratory oversight, samples collected on June 7 from receiving water stations RSW-001D (R-A), RSW-002D (R-C) and RSW-003D (R-D) were invalidated because an older analytical method was used analyze the samples. To prevent this oversight from reoccurring, laboratory personnel have updated internal procedures to specify the correct sampling method for mercury. Make-up samples were collected on July 20, 2023 and results will be included in the July report. Violation B eSMR
1117819 04/05/2023 DMON Per Section I of the MRP, recycled water samples shall be analyzed daily for total coliform. The total coliform result in the recycled water sample collected on April 5 was invalidated because the test initiation time was not properly recorded. All other coliform results for the month were either non-detect or 1 CFU/100 mL, therefore, this result was expected to be within normal ranges. Laboratory staff were reminded of proper recording and review procedures. Per Section I of the MRP, recycled water samples shall be analyzed daily for total coliform. The total coliform result in the recycled water sample collected on April 5 was invalidated because the test initiation time was not properly recorded. All other coliform results for the month were either non-detect or 1 CFU/100 mL, therefore, this result was expected to be within normal ranges. Laboratory staff were reminded of proper recording and review procedures. Violation U eSMR
1115393 02/07/2023 CAT1 Chloride Daily Maximum limit is 150 mg/L and reported value was 155 mg/L at EFF001 WRR. Per Section A.2 of the WRRs, the daily maximum chloride concentration of recycled water shall not exceed 150 mg/L. On February 7, a recycled water sample collected from the Pomona WRP had a chloride concentration of 155 mg/L, which exceeds the daily limit. Chloride loadings to the Pomona WRP can come from various residential and industrial sources, chemicals added during wastewater treatment, and the potable water supply. Plant operation was normal at the time of the exceedance and no cause of the elevated chloride result was identified. Reduced sewer flows due to drought conditions and water conservation have the potential to concentrate community loadings, resulting in higher plant influent chloride concentrations, and consequently, elevated effluent chloride concentrations. The supply water within the drainage area of the Pomona WRP consists of a blend of groundwater and surface water from the Metropolitan Water District¿s Weymouth Water Filtration Plant (WFP), and, overall, the chloride concentrations from the Weymouth WFP have been rising. This increase in chloride from the Weymouth WFP water as well as reduced sewer flows may be driving increases in effluent chloride concentration at the Pomona WRP. The Sanitation Districts will continue to monitor this constituent and, if necessary, will investigate and examine additional possible sources. Violation U eSMR
1114555 01/03/2023 CAT1 Chloride Daily Maximum limit is 150 mg/L and reported value was 151 mg/L at EFF001 WRR. Per Section A.2 of the WRRs, the daily maximum chloride concentration of recycled water shall not exceed 150 milligrams per liter (mg/L). On January 3, a recycled water sample collected from the Pomona WRP had a chloride concentration of 151 mg/L, which exceeds the daily limit. Chloride loadings to the Pomona WRP can come from various residential and industrial sources, chemicals added during wastewater treatment, and the potable water supply. Plant operation was normal at the time of the exceedance and no cause of the elevated chloride result was identified. Reduced sewer flows due to drought conditions and water conservation have the potential to concentrate community loadings, resulting in higher plant influent chloride concentrations, and consequently, elevated effluent chloride concentrations. The supply water within the drainage area of the Pomona WRP consists of a blend of groundwater and surface water from the Metropolitan Water District¿s Weymouth Water Filtration Plant (WFP), and, overall, the chloride concentrations from the Weymouth WFP have been rising. This increase in chloride from the Weymouth WFP water as well as reduced sewer flows may be driving increases in effluent chloride concentration at the Pomona WRP. The Sanitation Districts will continue to monitor this constituent and, if necessary, will investigate and examine additional possible sources. Violation U eSMR
1113244 12/06/2022 CAT1 Chloride Daily Maximum limit is 150 mg/L and reported value was 153 mg/L at EFF001 WRR. Per Section A.2 of the WRRs, the daily maximum chloride concentration of recycled water shall not exceed 150 milligrams per liter (mg/L). On December 6, a recycled water sample collected from the Pomona WRP had a chloride concentration of 153 mg/L, which exceeds the daily limit. Chloride loadings to the Pomona WRP can come from various residential and industrial sources, chemicals added during wastewater treatment, and the potable water supply. Plant operation was normal at the time of the exceedance and no cause of the elevated chloride result was identified. Reduced sewer flows due to drought conditions and water conservation have the potential to concentrate community loadings, resulting in higher plant influent chloride concentrations, and consequently, elevated effluent chloride concentrations. The supply water within the drainage area of the Pomona WRP consists of a blend of groundwater and surface water from the Metropolitan Water District's Weymouth Water Filtration Plant (WFP), and, overall, the chloride concentrations from the Weymouth WFP have been rising. This increase in chloride from the Weymouth WFP water as well as reduced sewer flows may be driving increases in effluent chloride concentration at the Pomona WRP. The Sanitation Districts will continue to monitor this constituent and, if necessary, will investigate and examine additional possible sources. Violation U eSMR
1109906 09/06/2022 CAT1 Chloride Daily Maximum limit is 150 mg/L and reported value was 159 mg/L at EFF001 WRR. Per Section A.2 of the WRRs, the daily maximum chloride concentration of recycled water shall not exceed 150 milligrams per liter (mg/L). On September 6, a recycled water sample collected from the Pomona WRP had a chloride concentration of 159 mg/L, which exceeds the daily limit. Chloride loadings to the Pomona WRP can come from various residential and industrial sources, chemicals added during wastewater treatment, and the potable water supply. Plant operation was normal at the time of the exceedance and no cause of the elevated chloride result was identified. Reduced sewer flows due to drought conditions and water conservation have the potential to concentrate community loadings, resulting in higher plant influent chloride concentrations, and consequently, elevated effluent chloride concentrations. The supply water within the drainage area of the Pomona WRP consists of a blend of groundwater and surface water from the Metropolitan Water District¿s Weymouth Water Filtration Plant (WFP), and, overall, the chloride concentrations from the Weymouth WFP have been rising. This increase in chloride from the Weymouth WFP water may be driving increases in effluent chloride concentration at the Pomona WRP. The Sanitation Districts will continue to monitor this constituent and, if such exceedances continue, will investigate and examine additional possible sources. Violation U eSMR
1109187 08/13/2022 DMON Per Section I of the MRP, recycled water shall be analyzed daily for total coliform. Total coliform results from recycled water samples collected on August 13 and 14 were invalid because expired media was inadvertently used during laboratory analysis. To prevent this issue from re-occurring, laboratory staff will ensure that the correct media is used for total coliform analyses. The Pomona WRP was operating under normal conditions during the month. Thus, total coliform concentrations in the final effluent are expected to have been within normal ranges. Per Section I of the MRP, recycled water shall be analyzed daily for total coliform. Total coliform results from recycled water samples collected on August 13 and 14 were invalid because expired media was inadvertently used during laboratory analysis. To prevent this issue from re-occurring, laboratory staff will ensure that the correct media is used for total coliform analyses. The Pomona WRP was operating under normal conditions during the month. Thus, total coliform concentrations in the final effluent are expected to have been within normal ranges. Violation U eSMR
1109205 07/07/2022 DMON Per Section 8.1 of the MRP, receiving water samples shall be analyzed monthly for nitrate, nitrite, nitrate plus nitrite, and total nitrogen. Nitrate, nitrite, nitrate plus nitrite, and total nitrogen results from a receiving water sample collected at RSW-001D (R-A) on July 7 were invalid because the sample was not analyzed within the appropriate laboratory holding time. The sample collected from RSW-001D was inadvertently switched with another sample prior to analysis, and by the time laboratory staff noticed the error, the RSW-001D sample was outside of the holding time and therefore not analyzed. A make-up sample was collected on September 7 and the results will be included in the corresponding report. Laboratory staff have reviewed procedures for tracking samples during handling and to complete analyses within the required holding time in the future. Per Section 8.1 of the MRP, receiving water samples shall be analyzed monthly for nitrate, nitrite, nitrate plus nitrite, and total nitrogen. Nitrate, nitrite, nitrate plus nitrite, and total nitrogen results from a receiving water sample collected at RSW-001D (R-A) on July 7 were invalid because the sample was not analyzed within the appropriate laboratory holding time. The sample collected from RSW-001D was inadvertently switched with another sample prior to analysis, and by the time laboratory staff noticed the error, the RSW-001D sample was outside of the holding time and therefore not analyzed. A make-up sample was collected on September 7 and the results will be included in the corresponding report. Laboratory staff have reviewed procedures for tracking samples during handling and to complete analyses within the required holding time in the future. Violation B eSMR
1103732 04/16/2022 LREP Annual SMR ( PRETRPT ) report for 2021 (2416175) was due on 15-APR-22 Violation B Report
1097864 10/05/2021 CAT1 Chloride Daily Maximum limit is 150 mg/L and reported value was 151 mg/L at EFF001 WRR. Per Section A.2 of the WRRs, the daily maximum chloride concentration of recycled water shall not exceed 150 milligrams per liter (mg/L). A recycled water sample collected from the Pomona WRP on October 5 was measured to have a chloride concentration of 151 mg/L, which exceeds the 150 mg/L daily limit. Chloride loadings to the Pomona WRP come from residential sources, industrial sources, chemicals added during wastewater treatment, and water supplied to the community. Plant operation was normal at the time of the exceedance and no cause of the elevated chloride result was identified. The Sanitation Districts will continue to monitor water quality in the recycled water and will conduct further investigations into potential causes, such as inspections of industrial waste dischargers, if future concentrations exceed the permit threshold. Violation U eSMR
1099032 10/01/2021 DMON Per Section 8 of the MRP, receiving water samples shall be analyzed monthly for bromoform, chloroform, dichlorobromomethane, dibromochloromethane, and total trihalomethanes. Receiving water samples were not collected for these constituents during the month of October due to a laboratory error in scheduling the sample collection. This scheduling error was associated with the new monitoring and reporting requirements of Order R4-2021-0097, which became effective in August 2021. Laboratory staff have reviewed their sample collection schedules, have updated those schedules accordingly, and began monthly sample collection for these constituents in November. Per Section 8 of the MRP, receiving water samples shall be analyzed monthly for bromoform, chloroform, dichlorobromomethane, dibromochloromethane, and total trihalomethanes. Receiving water samples were not collected for these constituents during the month of October due to a laboratory error in scheduling the sample collection. This scheduling error was associated with the new monitoring and reporting requirements of Order R4-2021-0097, which became effective in August 2021. Laboratory staff have reviewed their sample collection schedules, have updated those schedules accordingly, and began monthly sample collection for these constituents in November. Violation U eSMR
1097946 09/01/2021 DMON Per Section 8 of the MRP, receiving water samples shall be analyzed monthly for bromoform, chloroform, bromodichloromethane, dibromochloromethane, and total trihalomethanes. Receiving water samples were not collected for these constituents during the month of September due to a laboratory error in scheduling the sample collection. This scheduling error was associated with the new monitoring and reporting requirements of Order R4-2021-0097, which became effective in August 2021. Laboratory staff have reviewed their sample collection schedules and have updated those schedules accordingly. Per Section 8 of the MRP, receiving water samples shall be analyzed monthly for bromoform, chloroform, bromodichloromethane, dibromochloromethane, and total trihalomethanes. Receiving water samples were not collected for these constituents during the month of September due to a laboratory error in scheduling the sample collection. This scheduling error was associated with the new monitoring and reporting requirements of Order R4-2021-0097, which became effective in August 2021. Laboratory staff have reviewed their sample collection schedules and have updated those schedules accordingly. Violation U eSMR
1091924 05/29/2021 DMON Results from a recycled water sample collected on May 29 were invalid because the 24-hour composite was comprised of less than 12 aliquots. This issue was caused by a laboratory staff error in running the autosampler equipment; staff were alerted to the error and have been reminded of proper procedures. Results from a recycled water sample collected on May 29 were invalid because the 24-hour composite was comprised of less than 12 aliquots. This issue was caused by a laboratory staff error in running the autosampler equipment; staff were alerted to the error and have been reminded of proper procedures. Violation U eSMR
1088869 02/28/2021 DMON Per Section I of the MRP, Pomona WRP recycled water samples shall be collected daily for total coliform monitoring. A Pomona WRP recycled water sample was collected on February 28 but not analyzed for total coliform because the sample exceeded the appropriate holding time prior to analysis. To prevent this issue from re-occurring, laboratory staff will modify procedures for tracking samples that still require analysis. Violation U eSMR
1088879 01/03/2021 DMON Per Section IV.A.2 of the MRP, additional effluent samples shall be collected and analyzed for residual chlorine if the residual chlorine meter reads greater than 0.3 mg/L for more than five minutes. On January 3 at approximately 5:47 a.m., the residual chlorine meter in the final effluent exceeded 0.5 mg/L for over five minutes. Operations staff identified the cause as a blockage in the feed line for the sodium bisulfite dechlorinating agent and restored the bisulfite flow at approximately 6:30 a.m. Plant operators collected a grab sample from the final effluent at 7:38 a.m. following the incident and sent it to the laboratory for analysis. Laboratory staff analyzed the chlorine residual concentration in the sample and noted the concentration was non-detect. However, because the laboratory staff erroneously believed the sample was only being used for operational control, they did not record the sample result using their standard protocols. Thus, there is no official documentation of the sample collected January 3 at 7:38 a.m. following the chlorine residual exceedance. To prevent this issue from re-occurring, notification and sample collection procedures have been reviewed with operational and laboratory supervisory staff. Per Section IV.A.2 of the MRP, additional effluent samples shall be collected and analyzed for residual chlorine if the residual chlorine meter reads greater than 0.3 mg/L for more than five minutes. On January 3 at approximately 5:47 a.m., the residual chlorine meter in the final effluent exceeded 0.5 mg/L for over five minutes. Operations staff identified the cause as a blockage in the feed line for the sodium bisulfite dechlorinating agent and restored the bisulfite flow at approximately 6:30 a.m. Plant operators collected a grab sample from the final effluent at 7:38 a.m. following the incident and sent it to the laboratory for analysis. Laboratory staff analyzed the chlorine residual concentration in the sample and noted the concentration was non-detect. However, because the laboratory staff erroneously believed the sample was only being used for operational control, they did not record the sample result using their standard protocols. Thus, there is no official documentation of the sample collected January 3 at 7:38 a.m. following the chlorine residual exceedance. To prevent this issue from re-occurring, notification and sample collection procedures have been reviewed with operational and laboratory supervisory staff. Violation B eSMR
1086036 12/06/2020 Order Conditions An unauthorized discharge of Pomona WRP disinfected tertiary-treated recycled water occurred on December 6, 2020 from approximately 2:13 a.m. to 2:50 a.m. in Rowland Heights, CA near the intersection of Brea Canyon Cut Off Road and Balan Road. The Walnut Valley Water District (end user) reported the discharge to the Los Angeles County Sanitation Districts (Sanitation Districts) on December 16 at 10:54 a.m. The Sanitation Districts confirmed the discharge on December 17 at 11:10 am and provided verbal notification of the event to the Regional Board on the same day at 12:32 p.m. The unauthorized discharge occurred as a result of a car accident near the road intersection on December 6, 2020 at approximately 2:13 a.m. The accident sheared the roadside air vacuum valve and damaged the blow-off line. The estimated total discharge volume is approximately 180,000 gallons based on the size of the recycled water distribution line and duration of the discharge. To reach the nearest receiving water, the recycled water would have had to travel approximately 2.4 miles in the storm drain and discharge into the concrete-lined portion of the San Jose Creek. Residual chlorine in the recycled water would have decayed before reaching the receiving water due to the 2.4-mile travel distance and contact with substances exerting chlorine demand along the storm drain. As a verification measure, staff from the Sanitation Districts' Biological Sciences Group inspected San Jose Creek near the discharge point in Rowland Heights at 1:55 p.m. on December 17. There were no negative biological impacts observed. Because the unauthorized discharge was caused by an unforeseen car accident, additional preventative measures cannot be implemented to prevent a reoccurrence. Walnut Valley staff and Sanitation Districts' staff will review the notification and reporting procedures for unauthorized discharges. An unauthorized discharge of Pomona WRP disinfected tertiary-treated recycled water occurred on December 6, 2020 from approximately 2:13 a.m. to 2:50 a.m. in Rowland Heights, CA near the intersection of Brea Canyon Cut Off Road and Balan Road. The Walnut Valley Water District (end user) reported the discharge to the Los Angeles County Sanitation Districts (Sanitation Districts) on December 16 at 10:54 a.m. The Sanitation Districts confirmed the discharge on December 17 at 11:10 am and provided verbal notification of the event to the Regional Board on the same day at 12:32 p.m. The unauthorized discharge occurred as a result of a car accident near the road intersection on December 6, 2020 at approximately 2:13 a.m. The accident sheared the roadside air vacuum valve and damaged the blow-off line. The estimated total discharge volume is approximately 180,000 gallons based on the size of the recycled water distribution line and duration of the discharge. To reach the nearest receiving water, the recycled water would have had to travel approximately 2.4 miles in the storm drain and discharge into the concrete-lined portion of the San Jose Creek. Residual chlorine in the recycled water would have decayed before reaching the receiving water due to the 2.4-mile travel distance and contact with substances exerting chlorine demand along the storm drain. As a verification measure, staff from the Sanitation Districts' Biological Sciences Group inspected San Jose Creek near the discharge point in Rowland Heights at 1:55 p.m. on December 17. There were no negative biological impacts observed. Because the unauthorized discharge was caused by an unforeseen car accident, additional preventative measures cannot be implemented to prevent a reoccurrence. Walnut Valley staff and Sanitation Districts' staff will review the notification and reporting procedures for unauthorized discharges. Violation U eSMR
1069324 10/04/2019 DMON Per Section IV.A of the MRP, effluent chlorine residual samples shall be analyzed daily (Monday through Friday, except for holidays). Effluent chlorine residual results on October 4 were invalidated due to an exceedance of the holding time. Because the issue was identified the following day, no make-up samples were collected. As a corrective action, the analyst was reminded of the short holding time. Per Section IV.A of the MRP, effluent chlorine residual samples shall be analyzed daily (Monday through Friday, except for holidays). Effluent chlorine residual results on October 4 were invalidated due to an exceedance of the holding time. Because the issue was identified the following day, no make-up samples were collected. As a corrective action, the analyst was reminded of the short holding time. Violation U eSMR
1065321 08/06/2019 CAT1 Chloride Daily Maximum limit is 150 mg/L and reported value was 186 mg/L at EFF001 WRR. A recycled water sample collected from the Pomona WRP on August 6 was measured to have a concentration of 186 mg/L, which exceeded the daily maximum chloride limit of 150 mg/L. Chloride loadings to the Pomona WRP come from residential sources, industrial sources, chemicals added during wastewater treatment, and water supplied to the community. Plant operation was normal at the time of the exceedance and the salt loadings from the wastewater treatment processes were within typical levels. The chloride result appears to be anomalously high; this concentration is the highest value in the last 15 years, and the average concentration from January through July of 2019 was 133 mg/L. Industrial Waste (IW) staff at the Sanitation Districts identified a potential the source of the chloride to come from an industrial waste discharger located upstream of the Pomona WRP and will continue to investigate this issue further. The Sanitation Districts will continue to monitor water quality in the effluent and will conduct any necessary inspections of nearby industrial waste dischargers upstream of the Pomona WRP. Reduced sewer flows due to the recent drought conditions and water conservation measures have the potential to concentrate community loadings, resulting in higher plant influent chloride concentrations, and consequently, elevated plant effluent chloride concentrations. The supply water within the drainage area of the Pomona WRP consists of a blend of groundwater and surface water from the Metropolitan Water Districts Weymouth Water Filtration Plant (WFP). Overall, since 2011, the chloride concentration from the Weymouth WFP has been steadily rising. The Weymouth WFP effluent chloride average concentrations for 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, and 2019 were 63, 84, 87, 89, 98, 102, 55, 90, and 76 mg/L, respectively (the 2019 average is calculated using data from January through July 2019). Violation U eSMR
1066625 08/06/2019 CAT1 Chloride Monthly Average (Mean) limit is 180 mg/L and reported value was 186 mg/L at EFF-001. Per Section IV.A.1 of the WDR, the average monthly effluent limit (AMEL) for chloride is 180 mg/L. An effluent sample from the Pomona WRP was collected on August 6, 2019, and the measured chloride result of 186 mg/L was provided to Sanitation Districts Compliance staff on September 20, 2019. The Sanitation Districts notified Jeong-Hee Lim, Chief of the Municipal Permitting Unit, of the exceedance via a phone call the same day at 9:22 a.m., and submitted written confirmation of this event to the Regional Board on September 25. The chloride result appears to be anomalously high; the permit limit of 180 mg/L has not been exceeded for at least 15 years, and the average concentration from January through July of 2019 was 133 mg/L. Based on the results of a concurrent monthly effluent chronic toxicity test, the measured chloride level is unlikely to have had any impact on aquatic life: toxicity samples were collected on August 2, 5, and 6, 2019 and no toxicity was observed. Sanitation Districts staff identified a potential source: Master Recycling Center (MRC), an industrial waste discharger that processed off-spec waste and was located upstream of the Pomona WRP. During a July inspection of the facility, staff observed hundreds of packed pickle jars, which could contain high chloride concentrations. MRC's industrial discharge permit was revoked on July 24, and staff from the Sanitation Districts, City of Pomona, and the Pomona Police Department disconnected their industrial waste line on August 1. However, evidence indicated that they continued to discharge to the sewer: chloride concentrations in wastewater samples collected immediately downstream of MRC on August 7 and 14 were 168 mg/L and 597 mg/L, respectively. MRC's sanitary connection was sealed on September 19, 2019, and they are no longer in operation. The Sanitation Districts will continue to monitor effluent water quality and inspect nearby industrial waste dischargers as needed. Violation B eSMR
1065320 07/02/2019 CTOX Chronic Toxicity Maximum Daily (MDEL) limit is 0 Pass/Fail (Pass = 0, Fail = 1) and reported value was 1 Pass/Fail (Pass = 0, Fail = 1) at EFF-001. The Maximum Daily Effluent Limit (MDEL) for chronic toxicity was exceeded at the Pomona Water Reclamation Plant (WRP) for the test initiated on July 3, 2019. In accordance with Section VI.A.2.y of the WDR, the Sanitation Districts notified Jeong-Hee Lim, Chief of the Municipal Permitting Unit, at 1:52 p.m. on July 10, and submitted written confirmation of this event to the Regional Board on July 12, 2019. A 24-hour effluent composite sample collected July 2 from the Pomona WRP was acutely toxic: complete mortality was observed in undiluted sample within 24-hours of exposure. A semi-quantitative metals scan of the sample indicated silver concentrations of 28.5 µg/L in this sample, but <1 µg/L in the second and third samples collected for the test. The acutely toxic sample was reanalyzed using the quantitative EPA 200.8 test method and found to contain 57.5 µg/L of silver; literature reports that common silver complexes (e.g., silver nitrate) at this level could cause acute toxicity. This elevated level is anomalous; silver concentrations have not been detected above the reporting level (0.2 µg/L) in the Pomona WRP effluent since at least 2010. Sanitation Districts' industrial waste inspectors were immediately notified of this observation, and identified/interviewed five industrial dischargers that may use silver in their processes. Ultimately, none of the facilities are suspected of being the source of silver, but staff will continue to monitor these locations. Two additional tests that were conducted in July passed the Test of Significant Toxicity (TST); therefore the median monthly effluent limitation (MMEL) was not exceeded. Although a source has not been identified, evidence indicates that the observed toxicity was caused by silver complexes. As demonstrated by the subsequent samples with low silver concentrations and toxicity tests that passed the TST, this toxicity was episodic in nature and is no longer present. Violation B eSMR
1062088 05/23/2019 Surface Water Per Section V.A.16 of the WDR, the discharge shall not result in visible floating particulates, foams, or oil and grease in the receiving water. At approximately 7:15 a.m. on May 23, 2019, Sanitation Districts Operations personnel observed aggregated white foam and a light petroleum-like odor at Pomona WRP receiving water station RSW-001D. Staff increased the defoamant dose by 7:30 a.m., and the foam substantially cleared from the final effluent around 11 a.m. The Sanitation Districts Industrial Waste (IW) staff conducted an investigation and estimated that the foam-causing material entered the Pomona WRP between 12:00 a.m. and 1:00 a.m. on May 23. The Sanitation Districts provided notification of this exceedance as a voice message left for Jeong-Hee Lim, Chief of the Municipal Permitting Unit, at 4:26 p.m. that day, and a written confirmation of this event was submitted to the Regional Board on May 30, 2019. IW staff identified the source of the foam as Master Recycling Center (MRC), which is an industrial waste discharger located upstream of the Pomona WRP. Staff inspected the facility at approximately 10:15 a.m. on May 23, determined that the facility disposed at least one tote (250 gallons) of off-spec car-washing detergents and shampoo products into the sewer system the previous night, issued a Notice of Violation (NOV) of the Sanitation Districts Wastewater Ordinance to the company, and ordered the company to cease discharging these materials. Later that day, the final effluent discharge from the WRP had minimal foam and RSW-001D was largely clear of foam; all indications of foam were gone by approximately 2:30 p.m. the following day. The Sanitation Districts will continue to monitor water quality in the effluent and receiving waters, including routine visual inspections of the outfall, will increase the defoamant dose if foam is observed, and will continue to conduct any necessary inspections of MRC and other nearby industrial waste dischargers. Per Section V.A.16 of the WDR, the discharge shall not result in visible floating particulates, foams, or oil and grease in the receiving water. At approximately 7:15 a.m. on May 23, 2019, Sanitation Districts Operations personnel observed aggregated white foam and a light petroleum-like odor at Pomona WRP receiving water station RSW-001D. Staff increased the defoamant dose by 7:30 a.m., and the foam substantially cleared from the final effluent around 11 a.m. The Sanitation Districts Industrial Waste (IW) staff conducted an investigation and estimated that the foam-causing material entered the Pomona WRP between 12:00 a.m. and 1:00 a.m. on May 23. The Sanitation Districts provided notification of this exceedance as a voice message left for Jeong-Hee Lim, Chief of the Municipal Permitting Unit, at 4:26 p.m. that day, and a written confirmation of this event was submitted to the Regional Board on May 30, 2019. IW staff identified the source of the foam as Master Recycling Center (MRC), which is an industrial waste discharger located upstream of the Pomona WRP. Staff inspected the facility at approximately 10:15 a.m. on May 23, determined that the facility disposed at least one tote (250 gallons) of off-spec car-washing detergents and shampoo products into the sewer system the previous night, issued a Notice of Violation (NOV) of the Sanitation Districts Wastewater Ordinance to the company, and ordered the company to cease discharging these materials. Later that day, the final effluent discharge from the WRP had minimal foam and RSW-001D was largely clear of foam; all indications of foam were gone by approximately 2:30 p.m. the following day. The Sanitation Districts will continue to monitor water quality in the effluent and receiving waters, including routine visual inspections of the outfall, will increase the defoamant dose if foam is observed, and will continue to conduct any necessary inspections of MRC and other nearby industrial waste dischargers. Violation B eSMR
1061072 04/17/2019 Surface Water Per Section V.A.20 of the WDR, the discharge shall not cause the ammonia water quality objective in the Basin Plan to be exceeded in the receiving waters. The sample collected on April 17 (15.7 mg/L) exceeded the calculated 30-day average Basin Plan objective (3.85 mg/L) for ammonia at RSW-001D. Notification of this exceedance was provided as a voice message left for Jeong-Hee Lim, Chief of the Municipal Permitting Unit, at 12:04 p.m. on May 6, 2019 (the same day that the result was finalized), along with a five day written confirmation letter submitted on May 8, 2019, in accordance with WDR Section VI.A.2.y. The elevated ammonia concentration appears to be due to unsteady-state operational conditions at the Pomona WRP. To facilitate plant repairs, plant flows were reduced and one of the plant''s activated sludge units was taken out of service, which reduced the overall nitrifying biomass in the system. When plant flows were returned to normal levels on April 16, the ammonia load to the secondary treatment system increased with the higher flow, but the nitrifying bacteria population had not yet grown to handle this load. Operational data indicate that the ammonia load to the receiving water on April 17 was significantly higher than any other day in April, and the total ammonia load for the entire duration of the repairs (April 1-16). Therefore, the ammonia sample was collected on a day that was not representative of normal conditions. To prevent such events from reoccurring in the future, Operations staff are investigating options to maintain a higher nitrifying biomass in the system during reduced flow periods. In addition, it may be possible to bypass the secondary effluent to the sewer until the nitrifying biomass is sufficient. Sanitation Districts staff will try to ensure that representative samples are collected, and laboratory staff have been reminded of deadlines to ensure timely finalization of data to allow for collection of additional samples if needed. Per Section V.A.20 of the WDR, the discharge shall not cause the ammonia water quality objective in the Basin Plan to be exceeded in the receiving waters. The sample collected on April 17 (15.7 mg/L) exceeded the calculated 30-day average Basin Plan objective (3.85 mg/L) for ammonia at RSW-001D. Notification of this exceedance was provided as a voice message left for Jeong-Hee Lim, Chief of the Municipal Permitting Unit, at 12:04 p.m. on May 6, 2019 (the same day that the result was finalized), along with a five day written confirmation letter submitted on May 8, 2019, in accordance with WDR Section VI.A.2.y. The elevated ammonia concentration appears to be due to unsteady-state operational conditions at the Pomona WRP. To facilitate plant repairs, plant flows were reduced and one of the plant's activated sludge units was taken out of service, which reduced the overall nitrifying biomass in the system. When plant flows were returned to normal levels on April 16, the ammonia load to the secondary treatment system increased with the higher flow, but the nitrifying bacteria population had not yet grown to handle this load. Operational data indicate that the ammonia load to the receiving water on April 17 was significantly higher than any other day in April, and the total ammonia load for the entire duration of the repairs (April 1-16). Therefore, the ammonia sample was collected on a day that was not representative of normal conditions. To prevent such events from reoccurring in the future, Operations staff are investigating options to maintain a higher nitrifying biomass in the system during reduced flow periods. In addition, it may be possible to bypass the secondary effluent to the sewer until the nitrifying biomass is sufficient. Sanitation Districts staff will try to ensure that representative samples are collected, and laboratory staff have been reminded of deadlines to ensure timely finalization of data to allow for collection of additional samples if needed. Violation B eSMR
1061073 04/17/2019 Surface Water Per Section V.A.20 of the WDR, the discharge shall not cause the ammonia water quality objective in the Basin Plan to be exceeded in the receiving waters. The sample collected on April 17 (4.96 mg/L) exceeded the calculated daily maximum objective (1.84 mg/L) and 30-day average Basin Plan objective (0.64 mg/L) for ammonia at RSW-002D. Notification of these exceedances were provided as a voice message left for Jeong-Hee Lim, Chief of the Municipal Permitting Unit, at 12:04 p.m. on May 6, 2019 (the same day that the results were finalized), along with a five day written confirmation letter submitted on May 8, 2019, in accordance with WDR Section VI.A.2.y. The elevated ammonia concentrations appear to be due to unsteady-state operational conditions. To facilitate plant repairs, plant flows were reduced and one of the plant''s activated sludge units was taken out of service, which reduced the overall nitrifying biomass in the system. When plant flows returned to normal levels on April 16, ammonia load to the secondary treatment system increased with the higher flow, but the nitrifying bacteria population had not yet grown to handle this load. Operational data indicate that the ammonia load to the receiving water on April 17 was significantly higher than any other day in April, and the total ammonia load for the entire duration of the repairs (April 1-16). Therefore, the ammonia sample was collected on a day that was not representative of normal conditions. To prevent reoccurrence of such events, Operations staff are investigating options to maintain a higher nitrifying biomass in the system during reduced flow periods. In addition, it may be possible to bypass the secondary effluent to the sewer until the nitrifying biomass is sufficient. Sanitation Districts staff will try to ensure that representative samples are collected, and laboratory staff have been reminded of deadlines to ensure timely finalization of data to allow for collection of additional samples if needed. Per Section V.A.20 of the WDR, the discharge shall not cause the ammonia water quality objective in the Basin Plan to be exceeded in the receiving waters. The sample collected on April 17 (4.96 mg/L) exceeded the calculated daily maximum objective (1.84 mg/L) and 30-day average Basin Plan objective (0.64 mg/L) for ammonia at RSW-002D. Notification of these exceedances were provided as a voice message left for Jeong-Hee Lim, Chief of the Municipal Permitting Unit, at 12:04 p.m. on May 6, 2019 (the same day that the results were finalized), along with a five day written confirmation letter submitted on May 8, 2019, in accordance with WDR Section VI.A.2.y. The elevated ammonia concentrations appear to be due to unsteady-state operational conditions. To facilitate plant repairs, plant flows were reduced and one of the plant's activated sludge units was taken out of service, which reduced the overall nitrifying biomass in the system. When plant flows returned to normal levels on April 16, ammonia load to the secondary treatment system increased with the higher flow, but the nitrifying bacteria population had not yet grown to handle this load. Operational data indicate that the ammonia load to the receiving water on April 17 was significantly higher than any other day in April, and the total ammonia load for the entire duration of the repairs (April 1-16). Therefore, the ammonia sample was collected on a day that was not representative of normal conditions. To prevent reoccurrence of such events, Operations staff are investigating options to maintain a higher nitrifying biomass in the system during reduced flow periods. In addition, it may be possible to bypass the secondary effluent to the sewer until the nitrifying biomass is sufficient. Sanitation Districts staff will try to ensure that representative samples are collected, and laboratory staff have been reminded of deadlines to ensure timely finalization of data to allow for collection of additional samples if needed. Violation B eSMR
1061071 04/09/2019 CAT1 Ammonia, Total (as N) Daily Maximum limit is 6.6 mg/L and reported value was 6.9 mg/L at EFF-001. Per Section IV.A.1 of the WDR, the maximum daily effluent limitation (MDEL) for ammonia nitrogen shall not exceed 6.6 mg/L between April 1 and September 30. A collected effluent sample from the Pomona WRP on April 9, 2019 at 7 a.m. had a concentration of 6.9 mg/L. This result was finalized by laboratory staff on April 16. Notification of this exceedance was provided as a voice message left for Jeong-Hee Lim, Chief of the Municipal Permitting Unit, at 12:00 p.m. on April 17, 2019, along with a five day written confirmation letter submitted on April 19, 2019, in accordance with Section VI.A.2.y of the WDR. The investigation revealed that this incident was likely caused by unintentional over-dosing of ammonia during atypical plant operations when flows were reduced to conduct repairs. During the repairs, the filter effluent flow decreased by almost 80% to approximately 1.4 MGD. In response, the ammonia flow was decreased to near the minimum levels that can be reliably achieved by the dosing pump. However, even at these low levels, ammonia doses were higher than normal. Operational data indicate that the ammonia levels on this date were 15% higher than on any other date during the repairs. Although the concentration exceeded the MDEL, the ammonia load discharged to the receiving water was quite low due to the very low discharge flows. Initial calculations indicate that the load on April 9 was approximately 10 lb/day, which is significantly less than the 2018 average ammonia load of 70 lb/day, and well-below the MDEL of 400 lb/day. To prevent such events from reoccurring in the future, the Sanitation Districts plan to divert flow to the sewers (away from reuse and discharge) during repairs where the plant flow is significantly decreased. Doing so will cut off the recycled water supply, but will also eliminate discharge and the need to dose ammonia into the effluent, thereby preventing elevated ammonia levels from being discharged to receiving waters. Violation B eSMR
Report displays most recent five years of violations. Refer to the Interactive Violation Report for more data.
Total Violations: 30 Priority Violations: 0
*Click the "(+/-) Violation Description" link to expand and contract the violation description.
*As of 5/20/2010, the Water Board's Enforcement Policy requires that all violations be classified as 1, 2 or 3, with class 1 being the highest. Prior to this, violations were simply classified as Yes or No. If a 123 classification has been assigned to a violation that occurred before this date, that classification data will be displayed instead of the Yes/No data.

Violation Types
CAT1 = Category 1 Pollutant (Effluent Violation for Group 1 Pollutant) CTOX = Chronic Toxicity
DMON = Deficient Monitoring LREP = Late Report
Order Conditions = Order Conditions Surface Water = Surface Water

Expand/Contract Enforcement Actions
Enforcement Actions
Enf Id Enf Type Enf Order No. Effective Date Status
381719 Admin Civil Liability Stip Order 01/05/2012 Historical
359534 Expedited Payment Letter R4-2008-0122-M 12/23/2008 Withdrawn
304741 Time Schedule Order R4-2004-0100 07/30/2004 Historical
Total Enf Actions: 3

Expand/Contract Inspections
Inspections
Inspection ID Inspection Type Lead Inspector Actual End Date Planned Violations Attachment
50126389 B Type compliance inspection Kristie Kao 12/21/2022 N 0 N/A
44296845 Prerequirement inspection Danielle Robinson (Multiple) 05/27/2021 N 0 [Attachments]
41521038 B Type compliance inspection Kristie Kao 09/02/2020 N 0 N/A
33388714 B Type compliance inspection Jose Morales 11/28/2018 Y 0 Download
26400049 B Type compliance inspection Jose Morales 05/17/2017 Y 0 N/A
16928579 A Type compliance inspection Ariana Villanueva (Multiple) 03/05/2015 Y 0 Download
17181088 Prerequirement inspection Cris Morris (Multiple) 07/29/2014 Y 0 Download
9387797 A Type compliance inspection Jose Morales 06/17/2013 Y 0 Download
4062183 B Type compliance inspection Craig Blett 12/16/2010 Y 1 [Attachments]
1859117 A Type compliance inspection EPA Contractor 08/19/2009 Y 0 Download
1604903 B Type compliance inspection Scott Coulson 11/10/2008 Y 0 Download
1623638 A Type compliance inspection Jose Morales 06/06/2008 Y 0 N/A
1129910 A Type compliance inspection Jose Morales 05/31/2007 Y 0 [Attachments]
337962 A Type compliance inspection Jose Morales 12/08/2004 Y 0 N/A
335371 A Type compliance inspection Jose Morales 04/07/2004 Y 0 N/A
333500 A Type compliance inspection Jose Morales 11/05/2003 Y 0 N/A
330455 A Type compliance inspection Jose Morales 06/04/2003 Y 0 N/A
328695 A Type compliance inspection Jose Morales 11/13/2002 Y 0 N/A
325557 A Type compliance inspection Jose Morales 05/15/2002 Y 0 N/A
275628 A Type compliance inspection Jose Morales 10/09/2001 Y 0 N/A
275623 A Type compliance inspection Jose Morales 06/12/2001 Y 0 N/A
275622 B Type compliance inspection Veronica Cuevas-Alpuche 03/02/2001 Y 0 N/A
275599 A Type compliance inspection Veronica Cuevas-Alpuche 02/03/2001 Y 0 N/A
275604 A Type compliance inspection Jose Morales 04/23/2000 Y 0 N/A
275621 A Type compliance inspection Jose Morales 02/23/2000 Y 0 N/A
275625 A Type compliance inspection Jose Morales 02/17/1999 Y 0 N/A
275601 A Type compliance inspection Jose Morales 02/17/1999 Y 0 N/A
275600 A Type compliance inspection Jose Morales 02/18/1998 Y 0 N/A
275602 A Type compliance inspection Jose Morales 02/27/1997 Y 0 N/A
275627 A Type compliance inspection Jose Morales 02/27/1997 Y 0 N/A
275624 A Type compliance inspection Jose Morales 02/18/1997 Y 0 N/A
275626 A Type compliance inspection Jose Morales 03/13/1996 Y 0 N/A
275603 A Type compliance inspection Jose Morales 03/13/1996 Y 0 N/A
Total Inspections: 33 Last Inspection: 12/21/2022
  
The current report was generated with data as of: 03/29/2024
Regional Boards are in the process of entering backlogged data.
As a result, data may be incomplete.
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