| Water Body Name: | Rio Hondo Reach 2 (At Spreading Grounds) |
| Water Body ID: | CAR4051501019990202114543 |
| Water Body Type: | River & Stream |
DECISION ID |
4154 |
Region 4 |
Rio Hondo Reach 2 (At Spreading Grounds) |
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| Pollutant: | Ammonia |
| Final Listing Decision: | Delist from 303(d) list (being addressed by USEPA approved TMDL) |
| Last Listing Cycle's Final Listing Decision: | List on 303(d) list (being addressed by USEPA approved TMDL)(2006) |
| Revision Status | Revised |
| Reason for Delisting: | Applicable WQS attained; reason for recovery unspecified |
| TMDL Name: | Los Angeles River Nitrogen (11) |
| TMDL Project Code: | 229 |
| Date TMDL Approved by USEPA: | 03/18/2004 |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | This pollutant is being considered for removal from the section 303(d) list under section 4.1 of the Listing Policy. Under this section a single line of evidence is necessary to assess listing status.
Two lines of evidence are available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification for removing this water segment-pollutant combination from the section 303(d) list. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Zero of 301 samples exceeded the Basin Plan pH and temperature dependent acute ammonia criteria and zero of 100 samples exceeded the Basin Plan pH and temperature dependent chronic ammonia criteria use and this does not exceed the allowable frequency listed in Table 4.1 of the Listing Policy. 4. Pursuant to section 4.11 of the Listing Policy, no additional data and information are available indicating that standards are not met. |
| Regional Board Decision Recommendation: | After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should be removed from the section 303(d) list because applicable water quality standards for the pollutant are not being exceeded. |
| State Board Review of Regional Board Conclusion and Recommendation: | |
| State Board Decision Recommendation: | After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board. |
| USEPA Action (if applicable): | |
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| LOE ID: | 2483 | ||||
| Pollutant: | Ammonia | ||||
| LOE Subgroup: | Narrative Description Data | ||||
| Matrix: | Not Specified | ||||
| Fraction: | None | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 0 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | Not Specified | ||||
| Data Used to Assess Water Quality: | An alternative enforceable program is in place that will address ammonia water quality standards exceedances for this reach. In June 1995, the seven water reclamation plants discharging in the San Gabriel River and Santa Clara River watersheds received NPDES permits containing requirements regarding compliance with the Basin Plan water quality objectives for ammonia. In accordance with these permits, the Los Angeles County Sanitation Districts have been pursuing the addition of nitrification and denitrification facilities at each of these plants to comply with the ammonia objectives. By June 2003, it is expected that these new facilities will be operational and ammonia will be drastically reduced. Research facility operation shows that the monthly average ammonia concentration will fully comply with the chronic ammonia objective. Objective is expected to be applicable in June 2003.
It is probable that the majority of ammonia discharged to this water body was contributed by POTWs. Information in the record indicates that the majority (over 95%) of the ammonia in the Los Angeles River was contributed by POTWs. Also, it is probable that the contribution in the San Gabriel River watershed is dominated by contributions from POTWs as well. Generally, concentrations of ammonia upstream of the treatment plants are much lower than downstream concentrations (up to an order of magnitude difference). |
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| Data Reference: | Placeholder reference 2006 303(d) | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | |||||
| Objective/Criterion Reference: | |||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | |||||
| Temporal Representation: | |||||
| Environmental Conditions: | |||||
| QAPP Information: | QA Info Missing | ||||
| QAPP Information Reference(s): | |||||
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| LOE ID: | 28216 | ||||
| Pollutant: | Ammonia | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 301 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) | ||||
| Data Used to Assess Water Quality: | Zero of 301 samples exceeded the acute criteria for ammonia and one out of 100 samples exceeded the chronic criteria. Temperature and pH data corresponding to the ammonia samples were used for analysis. Temperature values ranged from 11.7 C to 32.8 C. Sample pH values ranged from 7.02 to 9.16. Samples are from the County Sanitation Districts of Los Angeles, Whittier Narrows Water Reclamation Plant (WNRP) Monitoring Reports 2003-2007 | ||||
| Data Reference: | Whittier Narrows Water Reclamation Plant (WNRP) -Monitoring Reports 2003-2007 | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | The acute (1-hour average) and chronic (4-day average) concentrations for ammonia are the highest concentrations of to which aquatic life can be exposed for a short period and an extended period of time, respectively, without deleterious effects applicable to protect aquatic life Beneficial Uses. These criteria are pH and temperature dependent and vary accordingly. The ammonia objectives and the pH and temperature dependent formulas are found in Attachment A of Regional Board Resolution No. 2002-011. | ||||
| Objective/Criterion Reference: | Water Quality Control Plan Los Angeles Region R4 Basin Plan | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | Two receiving water monitoring stations: RD located 1000 ft upstream from San Gabriel Boulevard, downstream of WNRP Discharge point 004, and RD-1 100ft upstream of WNRP Discharge point 004. | ||||
| Temporal Representation: | Weekly and monthly samples collected and analyzed from October 2003 to January 2008. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | Data collected for compliance with NPDES Permit No. CAS-004001 Monitoring and Reporting Programs. | ||||
| QAPP Information Reference(s): | Monitoring and Reporting Program - CI 6948 for order no. 01-182 NPDES No. CAS004001 Municipal Storm Water and Urban Runoff Discharges within the County of Los Angeles, and the incorporated cities, except the City of Long Beach | ||||
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| LOE ID: | 2485 | ||||
| Pollutant: | Ammonia | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | None | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 36 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | PHYSICAL/CHEMICAL MONITORING | ||||
| Data Used to Assess Water Quality: | Based on 30-day average concentrations of ammonia, no samples of 36 total samples exceed the ammonia objective. Ambient measurements of pH and temperature (30-day averages) were used to calculate the water quality objective. (LACSD, 2004b). | ||||
| Data Reference: | Placeholder reference 2006 303(d) | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | In order to protect aquatic life, ammonia concentrations in inland surface waters characteristic of freshwater shall not exceed the values calculated for the appropriate instream conditions [both pH and temperature] shown in Tables 3-1 to 3-3 [in the Basin Plan] (per U.S. EPA's most recent criteria guidance document, '1999 Update of Ambient Water Quality Criteria for Ammonia'). | ||||
| Objective/Criterion Reference: | Placeholder reference 2006 303(d) | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | Three stations. | ||||
| Temporal Representation: | Samples were collected from February 2001 through November 2004. New management practices were begun at the beginning of this period and may have resulted in a change in water quality. Water quality measurements collected before the implementation of management measures were not considered representative of current conditions. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | NPDES quality assurance. | ||||
| QAPP Information Reference(s): | |||||
DECISION ID |
17920 |
Region 4 |
Rio Hondo Reach 2 (At Spreading Grounds) |
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| Pollutant: | Cyanide |
| Final Listing Decision: | List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | New Decision |
| Revision Status | Revised |
| Sources: | Other |
| Expected TMDL Completion Date: | 2021 |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | Regional Board Conclusion:
The Los Angeles Regional Water Quality Control Board (Region 4), for the 2008 listing cycle, had incorrectly assessed and listed Rio Hondo Reach 1 for cyanide. The State Water Board is responding to Region 4's request to correct this error. The data and information for Rio Hondo Reach 1 has been retired and Rio Hondo Reach 2 is being assessed for cyanide. This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One line of evidence is available in the administrative record to assess this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification in favor of placing this water segment-pollutant combination on the section 303(d) list in the Water Quality Limited Segments category. This conclusion is based on the staff findings that: 1. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. 2. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 3. Three of six samples exceed the CTR chronic criteria and one of six samples exceed both the CCC and CMC criteria and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. 4. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are met. State Board Review and Conclusion: The Los Angeles Water Board staff assessed Rio Hondo Reach 1 for Cyanide instead of the appropriate reach, Reach 2. The Los Angeles Water Board approved the listing of Reach 1 for Cyanide. The Regional Water Board staff asked State Water Board staff to correct the error and place the correct water segment on 303(d) list. State Water Board staff evaluated the information and propose to remove the Rio Hondo Reach 1 from the 303 (d) list and to List the Rio Hondo Reach 2 for Cyanide. |
| Regional Board Decision Recommendation: | N/A |
| State Board Review of Regional Board Conclusion and Recommendation: | |
| State Board Decision Recommendation: | The assessment and decision for this water body pollutant-combination was developed in response to a request from Region 4 staff. After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should be placed on the section 303(d) list because applicable water quality standards are exceeded and a pollutant contributes to or causes the problem. |
| USEPA Action (if applicable): | USEPA approved the listing of this water body as a water quality limited segment requiring a TMDL for this pollutant. |
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| LOE ID: | 30913 | ||||
| Pollutant: | Cyanide | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | Total | ||||
| Beneficial Use: | Warm Freshwater Habitat | ||||
| Number of Samples: | 6 | ||||
| Number of Exceedances: | 3 | ||||
| Data and Information Type: | Fixed station physical/chemical (conventional plus toxic pollutants) | ||||
| Data Used to Assess Water Quality: | Three of six samples exceeded the CTR CCC limit and one of six samples exceeded the CMC limit. Data from the County of Los Angeles Stormwater Monitoring Report 2003/04 | ||||
| Data Reference: | Monitoring Report (MS4 Data) - CI 6948 for order no. 01-182 NPDES No. CAS004001 Municipal Storm Water and Urban Runoff Discharges within the County of Los Angeles, and the Incorporated Cities therein, Except the City of Long Beach | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | CTR Criteria Continuous Concentration of 0.0052 mg/L is the highest concentration of cyanide to which aquatic life can be exposed for an extended period of time (four days) without deleterious effects applicable to protect aquatic life Beneficial Uses. The CTR Criteria Maximum Concentration CMC of 0.022 mg/l is the highest concentration of cyanide to which aquatic life can be exposed for a short period of time without deleterious effects. These criteria are linked and applicable for the protection of aquatic life Beneficial Uses. | ||||
| Objective/Criterion Reference: | Water Quality Standards 2000. Establishment of numeric criteria for priority toxic pollutants for the State of California: Rules and regulations. Federal Register Vol. 65, No. 97. Washington, D.C.: Environmental Protection Agency | ||||
| Evaluation Guideline: | |||||
| Guideline Reference: | |||||
| Spatial Representation: | One stormwater monitoring station: TS06 located on Beverly Blvd, downstream of Whittier Narrows dam, at the USGS - U.S. Army Corps of Engineers (ACOE) Stream gage No. 1102300 or E327-R. | ||||
| Temporal Representation: | Grab samples collected and analyzed over the 2003-04 storm year. | ||||
| Environmental Conditions: | |||||
| QAPP Information: | Data collected for compliance with NPDES Permit No. CAS-004001 Monitoring and Reporting Programs. | ||||
| QAPP Information Reference(s): | Monitoring and Reporting Program - CI 6948 for order no. 01-182 NPDES No. CAS004001 Municipal Storm Water and Urban Runoff Discharges within the County of Los Angeles, and the incorporated cities, except the City of Long Beach | ||||
DECISION ID |
7448 |
Region 4 |
Rio Hondo Reach 2 (At Spreading Grounds) |
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| Pollutant: | Coliform Bacteria |
| Final Listing Decision: | List on 303(d) list (TMDL required list) |
| Last Listing Cycle's Final Listing Decision: | List on 303(d) list (TMDL required list)(2006) |
| Revision Status | Original |
| Sources: | Nonpoint Source | Point Source |
| Expected TMDL Completion Date: | 2009 |
| Impairment from Pollutant or Pollution: | Pollutant |
| Regional Board Conclusion: | 303(d) listing decisions made prior to 2006 were not held in an assessment database. The Regional Boards will update this decision when new data and information become available and are assessed. |
| Regional Board Decision Recommendation: | The decision has not changed. |
| State Board Review of Regional Board Conclusion and Recommendation: | |
| State Board Decision Recommendation: | After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board. |
| USEPA Action (if applicable): | USEPA approved the listing of this water body as a water quality limited segment requiring a TMDL for this pollutant. |
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| LOE ID: | 4385 | ||||
| Pollutant: | Coliform Bacteria | ||||
| LOE Subgroup: | Pollutant-Water | ||||
| Matrix: | Water | ||||
| Fraction: | Not Recorded | ||||
| Beneficial Use: | Water Contact Recreation | ||||
| Number of Samples: | 0 | ||||
| Number of Exceedances: | 0 | ||||
| Data and Information Type: | Not Specified | ||||
| Data Used to Assess Water Quality: | Unspecified--This LOE is a placeholder to support a 303(d) listing decision made prior to 2006. | ||||
| Data Reference: | Placeholder reference pre-2006 303(d) | ||||
| SWAMP Data: | Non-SWAMP | ||||
| Water Quality Objective/Criterion: | Unspecified | ||||
| Objective/Criterion Reference: | Placeholder reference pre-2006 303(d) | ||||
| Evaluation Guideline: | Unspecified | ||||
| Guideline Reference: | Placeholder reference pre-2006 303(d) | ||||
| Spatial Representation: | Unspecified | ||||
| Temporal Representation: | Unspecified | ||||
| Environmental Conditions: | Unspecified | ||||
| QAPP Information: | Unspecified | ||||
| QAPP Information Reference(s): | |||||