Final California 2010 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 8 - Santa Ana Region

Water Body Name:	Santa Ana River, Reach 1
Water Body ID:	CAR8011100019991014112418
Water Body Type:	River & Stream


DECISION ID	17849	Region 8
Santa Ana River, Reach 1

Pollutant:	Fecal Coliform
Final Listing Decision:	Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision:	New Decision
Revision Status	Revised
Impairment from Pollutant or Pollution:	Pollutant

Regional Board Conclusion:	This pollutant is being considered for placement on the section 303(d) list under section 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Two lines of evidence are available in the administrative record (one line of evidence for body contact and one line of evidence for non body contact recreation) to assess this pollutant. Two hundred and four of the samples exceed the water quality objective for the body contact recreation beneficial use and 56 exceed the objective for the non body contact recreation beneficial use. Based on the readily available data and information, the weight of evidence indicates that there is sufficient justification against 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. Two hundred and four of 1,516 samples exceeded the water quality objective consisting of the logmean and the single sample standard for the body contact recreation and 56 of 1,516 samples exceed the objective consisting of the average and single sample standard and this does not exceed the allowable frequency listed in Table 3.2 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 not met.

Regional Board Decision Recommendation:	After review of the available data and information, RWQCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards are not being exceeded.

State Board Review of Regional Board Conclusion and Recommendation:

State Board Decision Recommendation:	After review of the available data and information, SWRCB staff concludes that the water body-pollutant combination should not be placed on the section 303(d) list because applicable water quality standards for the pollutant are not exceeded.

USEPA Action (if applicable):

Line of Evidence (LOE) for Decision ID 17849, Fecal Coliform	Region 8
Santa Ana River, Reach 1

LOE ID:

30549

Pollutant:

Fecal Coliform

LOE Subgroup:

Pollutant-Water

Matrix:

Water

Fraction:

None

Beneficial Use:

Non-Contact Recreation

Number of Samples:

1516

Number of Exceedances:

Data and Information Type:

PATHOGEN MONITORING

Data Used to Assess Water Quality:

Of the 1,516 samples collected, 56 exceeded the Basin Plan criteria. This data was obtained from the Orange County Health Care Agency.

Data Reference:

Bacteria data for Orange County beaches downloaded from Orange County Health Care website.

SWAMP Data:

Non-SWAMP

Water Quality Objective/Criterion:

Basin Plan: Average less than 2000 organisms per 100 ml and not more than 10% of samples exceed 4,000 organisms per 100 ml for any 30-day period.

Objective/Criterion Reference:

Water Quality Control Plan for the Santa Ana River Basin

Evaluation Guideline:

Guideline Reference:

Water Quality Control Plan Ocean Waters of California. California Ocean Plan 2005. Sacramento, CA: State Water Resources Control Board, California Environmental Protection Agency

Spatial Representation:

The 1,516 samples were collected at the Santa Ana River- South station of Reach 1 of the Santa Ana River.

Temporal Representation:

The 1516 samples were collected weekly from Sept 25 2002 through December 2008.

Environmental Conditions:

The data spanned 6 entire years including wet and dry seasons.

QAPP Information:

The datas quality is deemed appropriate because it was collected by the Orange County Environmental Health Agency .

QAPP Information Reference(s):

Line of Evidence (LOE) for Decision ID 17849, Fecal Coliform	Region 8
Santa Ana River, Reach 1