# Final 2008 California 303(d)/305(b) Integrated Report

# Supporting Information

## Regional Board 5 - Central Valley Region

Water Body Name: | San Joaquin River (Friant Dam to Mendota Pool)
Water Body ID: | CAR5453001020050602140817
Water Body Type: | River & Stream

DECISION ID | 6783
Pollutant: | Invasive Species
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: | Source Unknown
Expected TMDL Completion Date: | 2019
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for placement on the section 303(d) list under section 3.10 of the Listing Policy. Under section 3.10 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. Comparative analysis between four studies, from 1898 to 1971 was used to show an increase of non-native species and a decrease in native species over time. 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. Four studies were used spanning from 1898 to 1971. 2. Baseline data was taken from the 1898, 1934, and 1940-41 studies. 3. In a 1898 survey: 9 native species collected, 0 non-native species collected; in a 1934 survey: 10 native species were collected and 4 non-native species were collected; in a 1940-1941 survey: 13 native species were collected and 8 non-native species were collected; and in a 1969-71 survey: 6 native species were collected and 7 non-native species were collected. As the number of non-native fish species increased, the number of native fish species decreased over time. 4. It cannot be determined if the trend in water quality is expected to meet water standards by the next listing cycle. 5. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
RWQCB Board Decision / Staff Recommendation: | No new data were assessed for 2008. The Regional Board will update this decision when new data and information become available and are assessed.
SWRCB Board Decision / Staff Recommendation: | This is a decision made by the State Water Resources Control Board and approved by the USEPA in 2006 . No new data were assessed by the Regional Board for 2008. The decision has not changed.
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 6783

LOE ID: | 2819
Pollutant: | Invasive Species
LOE Subgroup: | Population/Community Degradation
Matrix: | Water
Fraction: | None
Beneficial Use: | Warm Freshwater Habitat
Number of Samples: | 0
Number of Exceedances: | 0
Data and Information Type: | Fish surveys
Data Used to Assess Water Quality: | The species assessed in support of this listing are: brown trout, carp, brown bullhead, green sunfish, and bluegill. A fish survey was completed between 1969-1971 (Moyle and Nichols, 1974). Data was compared to previous collections, as follows: (1) in a 1898 survey: 9 native species collected, 0 non-native species collected; (2) in a 1934 survey: 10 native species collected and 4 non-native species collected (brown trout, carp, bluegill and smallmouth bass); (3) in a 1940-1941 survey: 13 native species collected and 8 non-native species collected (brown trout, carp, brown bullfish, mosquitofish, green sunfish, bluegill, smallmouth and largemouth bass); and (4) in a 1969-71 survey (this study): 6 native species collected and 7 non-native species collected (brown trout, carp, mosquitofish, brown bullhead, green sunfish, bluegill, and largemouth bass). As the number of non-native fish species increased, the number of native fish species decreased over time.
Data Reference: | Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: | All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. This objective applies regardless of whether the toxicity is caused by a single substance or the interactive effect of multiple substances. Compliance with this objective will be determined by analyses of indicator organisms, species diversity, population density, growth anomalies, and biotoxicity tests of appropriate duration or other methods as specified by the Regional Water Board. Taken from Region 5 Basin Plan, Page III-8.00, Water Quality Objectives.
Objective/Criterion Reference: | Placeholder reference 2006 303(d)
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected at 167 locations during the summer and autumns of 1969, 1970, and 1971 for this study at Friant Dam on the San Joaquin River.
Temporal Representation: | Time range from 1898 to 1971. Samples from the study were compared to measurements collected in 1898, 1934, and 1940-1941. This study: summer and autumns of 1969, 1970 and 1971.
Environmental Conditions: | Changes in relative diversity and abundance of native species may also be driven by habitat alteration, flow changes, or hydromodification.
QAPP Information: | Peer Reviewed Journal Article.
QAPP Information Reference(s):