Water Body Name: | Elder Creek |
Water Body ID: | CAR5191100019980817124745 |
Water Body Type: | River & Stream |
Lines of Evidence (LOEs) for Decision ID 12991 |
LOE ID: | 22096 |
Pollutant: | Pyrethroids |
LOE Subgroup: | Pollutant-Sediment |
Matrix: | Sediment |
Fraction: | Total |
Beneficial Use: | Warm Freshwater Habitat |
Aquatic Life Use: | Warm Freshwater Habitat |
Number of Samples: | 3 |
Number of Exceedances: | 3 |
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: | Three of three sediment toxicity testing samples violated the narrative toxicity objective. The three toxic (Mean mortality + standard deviation) sediment samples were collected from:Elder Creek at Gerber Road10/15/04: 35+40.310/28/04: 45+18.53/10/05: 30+10.7Toxicity observations were associated with pyrethroid pesticides. LC50s for sediment-bound pyrethroids were used in this study as toxicity threshold benchmarks in a Toxic Unit (TU) analysis normalized to organic carbon content. The TU analysis of Elder Creek sediment samples demonstrated that the three toxic samples had pyrethroid pesticide concentrations that would be expected to be acutely toxic. Sediment samples collected from Elder Creek had an average of 2.06 - 3.55 TUs of pyrethroid pesticides. Bifenthrin appears to play a dominant role in the toxicity observations, but was not the only pyrethroid found in toxic sediment samples. Other pyrethroids observed in the toxic samples from Elder Creek included cyfluthrin, cypermethrin, deltamethrin, esfenvalerate, lambda-cyhalothrin, and permethrin. LC50 concentrations for a 10-day exposure of Hyalella azteca to pyrethroid contaminated sediments were determined by Amweg et al., 2005. (Amweg, E.L., D.P. Weston, and N.M Ureda. 2005. Use and toxicity of pyrethroid pesticides in the Central Valley, California, U.S.A. Environ. Toxicol. Chem. 24:966-972 (with correction in Environ. Toxicol. Chem. 24:1300-1301)). |
Data Reference: | Pyrethroid insecticides and sediment toxicity in urban creeks from California and Tennessee. Environmental Science and Technology, 40(5): 1700-1706 |
Water Quality Objective/Criterion: | No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses. (CVRWQCB, 2007)All waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life. (CVRWQCB, 2007) |
Objective/Criterion Reference: | Central Valley Regional Water Quality Control Board. Water Quality Control Plan (Basin Plan) for the California Regional Water Quality Control Board - Central Valley Region |
Evaluation Guideline: | Statistically significant difference from control sediment using Dunnett's test in 10-day Hyalella azteca sediment toxicity tests. Arcsin squareroot transformation was used when necessary to meet the assumptions of normality and homogeneity of variance. Steel's test was used for comparison to control if these assumptions were not met after transformation. |
Guideline Reference: | |
Spatial Representation: | Three samples were collected from Elder Creek at Gerber Road on different occasions (October 15, 2004; October 28, 2004; and March 10, 2005). Sediment toxicity was observed from all three of the samples. Sample location:Elder Creek at Gerber Road |
Temporal Representation: | Samples were collected August 2004 - August 2005.The Elder Creek sampling location reflects mixed commercial and residential land uses. |
Environmental Conditions: | |
QAPP Information: | Data quality: Excellent.. Monitoring was conducted in accordance with the Quality Assurance Project Plan for Monitoring prepared for the Sacramento River Watershed Program (SRWP 1999a, 1999b, 2000b, 2001b, 2002b, 2003b, 2006). |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 4935 |
LOE ID: | 2637 |
Pollutant: | Chlorpyrifos |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Total |
Beneficial Use: | Warm Freshwater Habitat |
Number of Samples: | 25 |
Number of Exceedances: | 5 |
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: | In 2001 and 2003, Regional Board staff monitored the segment of Elder Creek that runs adjacent to a 250-acre commercial nursery to better characterize nursery contributions of pesticides to Elder Creek, a tributary of Morrison Creek. Five samples were taken in 2001; all were non-detects. In 2003, chlorpyrifos concentrations at the Elder Creek downstream monitoring site (downstream of a 250-acre commercial nursery) were the highest overall, with 70 percent of the chlorpyrifos detections above the CDFG aquatic life water quality criterion for chlorpyrifos (0.020 ug/L). From mid-March to mid-April 2003, chlorpyrifos concentrations in samples collected from the downstream Elder Creek monitoring site were consistently high (ranging from 0.035 ug/L to 0.320 ug/L) while samples collected from the upstream Elder Creek monitoring site had non-detectable chlorpyrifos concentrations 80 percent of the time. Twenty samples were taken at two locations; 5 samples at the Bradshaw Road site exceeded the CDFG criteria (Spector et al., 2004). |
Data Reference: | Placeholder reference 2006 303(d) |
Water Quality Objective/Criterion: | The narrative pesticide objectives state, in part:
- No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses, - Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses, - Pesticide concentrations shall not exceed those allowable by applicable antidegradation policies, and - Pesticide concentrations shall not exceed the lowest levels technically and economically achievable. The Basin Plan's narrative water quality objective for toxicity states that 'all waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life.' |
Objective/Criterion Reference: | Placeholder reference 2006 303(d) |
Evaluation Guideline: | CDFG Hazard Assessment Criteria - 14 ng/L 4-day average. |
Guideline Reference: | Placeholder reference 2006 303(d) |
Spatial Representation: | Samples were collected beneath the water surface as near as possible to the center of the stream when water levels were low or when access was only possible from the bank. Otherwise, three to four grab samples were collected as one integrated grab sample. Elder Creek was monitored by Regional Board staff at two locations in 2003 - upstream and downstream of Village Nursery at Excelsior Road and Bradshaw Road. In 2001, Regional Board staff monitored Elder Creek at three sites, Elder Creek Road, Elk Grove-Florin Road, and Franklin Boulevard. |
Temporal Representation: | Storm events were sampled during the orchard dormant spray season months of January and February 2001 and 2002, and January through April 2003, to determine pesticide concentrations in rain and creeks during and after the orchard dormant spray season. |
Environmental Conditions: | |
QAPP Information: | During each monitoring season, additional samples were collected for quality assurance/quality control (QA/QC) purposes. Four types of quality assurance samples were collected to confirm the integrity of analytical results reported in this three-year monitoring study. The QA/QC samples included sample duplicates, equipment blanks, matrix spikes, and matrix spike duplicates. The procedures used for collecting the QA/QC samples are based on the San Joaquin River TMDL Quality Assurance Project Plan. During this 2001-2003 study, approximately 15-25 percent of the samples collected were either equipment blanks, sample duplicates, or matrix spikes and matrix spike duplicates. |
QAPP Information Reference(s): |
Lines of Evidence (LOEs) for Decision ID 5211 |
LOE ID: | 2639 |
Pollutant: | Diazinon |
LOE Subgroup: | Pollutant-Water |
Matrix: | Water |
Fraction: | Total |
Beneficial Use: | Warm Freshwater Habitat |
Number of Samples: | 25 |
Number of Exceedances: | 1 |
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING |
Data Used to Assess Water Quality: | In 2001 and 2003, Regional Board staff monitored the segment of Elder Creek that runs adjacent to a 250-acre commercial nursery to better characterize nursery contributions of pesticides to Elder Creek, a tributary of Morrison Creek. Diazinon concentrations were low to non-detectable at the upstream and downstream Elder Creek monitoring sites. Five samples were taken in 2001 at three locations; one of the samples taken at Franklin Blvd. exceeded the CDFG criteria. In 2003, 20 samples were taken at two locations; none of the samples exceeded the CDFG criteria (Spector et al., 2004). |
Data Reference: | Placeholder reference 2006 303(d) |
Water Quality Objective/Criterion: | The narrative pesticide objectives state, in part:
- No individual pesticide or combination of pesticides shall be present in concentrations that adversely affect beneficial uses, - Discharges shall not result in pesticide concentrations in bottom sediments or aquatic life that adversely affect beneficial uses, - Pesticide concentrations shall not exceed those allowable by applicable antidegradation policies, and - Pesticide concentrations shall not exceed the lowest levels technically and economically achievable. The Basin Plan's narrative water quality objective for toxicity states that "all waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human, plant, animal, or aquatic life." |
Objective/Criterion Reference: | Placeholder reference 2006 303(d) |
Evaluation Guideline: | CDFG Hazard Assessment Criteria 0.16 ug/L 1-hour average (Siepman & Finlayson, 2000; Finlayson, 2004). |
Guideline Reference: | Placeholder reference 2006 303(d) |
Spatial Representation: | Samples were collected beneath the water surface as near as possible to the center of the stream when water levels were low or when access was only possible from the bank. Otherwise, three to four grab samples were collected as one integrated grab sample. Elder Creek was monitored by Regional Board staff at two locations in 2003 - upstream and downstream of Village Nursery at Excelsior Road and Bradshaw Road. In 2001, Regional Board staff monitored Elder Creek at three sites, Elder Creek Road, Elk Grove-Florin Road, and Franklin Boulevard. |
Temporal Representation: | Storm events were sampled during the orchard dormant spray season months of January and February 2001 and 2002, and January through April 2003, to determine pesticide concentrations in rain and creeks during and after the orchard dormant spray season. |
Environmental Conditions: | |
QAPP Information: | During each monitoring season, additional samples were collected for quality assurance/quality control (QA/QC) purposes. Four types of quality assurance samples were collected to confirm the integrity of analytical results reported in this three-year monitoring study. The QA/QC samples included sample duplicates, equipment blanks, matrix spikes, and matrix spike duplicates. The procedures used for collecting the QA/QC samples are based on the San Joaquin River TMDL Quality Assurance Project Plan. During this 2001-2003 study, approximately 15-25 percent of the samples collected were either equipment blanks, sample duplicates, or matrix spikes and matrix spike duplicates. |
QAPP Information Reference(s): |