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

# Supporting Information

## Regional Board 5 - Central Valley Region

Water Body Name: | Pleasant Grove Creek
Water Body ID: | CAR5192200020070510150258
Water Body Type: | River & Stream

DECISION ID | 9712
Pollutant: | Ammonia
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
Weight of Evidence: | This pollutant is being considered for listing under sections 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. Data is available from 2 lines of evidence for this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list. The recommendation is based on staff findings that 0 of 40 available concentrations exceeded the USEPA Health Advisory for Ammonia and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The recommendation is based on staff findings that 0 of 38 available concentrations exceeded the USEPA Freshwater Aquatic Life Protection Criteria Maximum Concentration and this does not exceed the allowable frequency using Table 3.1 of the Listing Policy. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 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: | 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 9712

LOE ID: | 20947
Pollutant: | Ammonia
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 40
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | 0 of the 40 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Ammonia.
Data Reference: | SWAMP data entered by SWRCB into BDAT database
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. (CRWQCB, 2006)
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: | Ammonia levels should not exceed 30 mg/L (USEPA Health Advisory).
Guideline Reference: | 2006 edition of the drinking water standards and health advisories. EPA 822-R-03-013
Spatial Representation: | Samples were collected at PGC @ Fiddyment. Samples were collected at PGC @ Industrial. Samples were collected at PGC @ Petigrew.
Temporal Representation: | The samples were collected from Jan 17 2001 to Mar 25 2002.
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
LOE ID: | 20897
Pollutant: | Ammonia
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Cold Freshwater Habitat
Aquatic Life Use: | Cold Freshwater Habitat
Number of Samples: | 38
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | 0 of the 38 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation guideline for Ammonia.
Data Reference: | SWAMP data entered by SWRCB into BDAT database
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. (CRWQCB, 2006)
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: | Ammonia levels should not to exceed the calculated limit. Freshwater Aquatic Life Protection (Salmonid present) Criteria Maximum Concentration (CMC) (1-hour Average (mg N/L)) calculated based on the following formula: CMC = (0.275/(1 + 107.204-pH)) + (39.0/(1 + 10pH-7.204)) which incorporates pH (US EPA, 2005: Appendix C)
Guideline Reference: | 1999 Update of Ambient Water Quality Criteria for Ammonia
Spatial Representation: | Samples were collected at PGC @ Fiddyment. Samples were collected at PGC @ Industrial. Samples were collected at PGC @ Petigrew.
Temporal Representation: | The samples were collected from Jan 17 2001 to Mar 25 2002.
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):

DECISION ID | 9713
Pollutant: | Specific Conductivity
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
Weight of Evidence: | This pollutant is being considered for listing under sections 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Data is available from 1 line of evidence for this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list. The recommendation is based on staff findings that 0 of 58 available concentrations exceeded the water quality objective and this does not exceed the allowable frequency using Table 3.2 of the Listing Policy. Table 3.2 of the listing policy recommends listing if a sample size of 58 has 10 or more samples that exceed the evaluation criteria. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 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: | 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 9713

LOE ID: | 20990
Pollutant: | Specific Conductivity
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Municipal & Domestic Supply
Number of Samples: | 58
Number of Exceedances: | 0
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | None of the 58 samples collected by the Surface Water Ambient Monitoring Program exceeded the "recommended" Secondary MCL of 900 uS/cm for electrical conductivity
Data Reference: | SWAMP data entered by SWRCB into BDAT database
Water Quality Objective/Criterion: | The secondary MCLs for electrical conductivity provide a range of values including a "recommended" level (900 uS/cm), upper level (1600 uS/cm) and a short-term level (2200 uS/cm). The recommended concentration was used as it is intended to be protective of all drinking water uses
Objective/Criterion Reference: | California Code of Regulations, Title 22, Division 4, Chapter 15. Domestic Water Quality and Monitoring. http://www.cdph.ca.gov/certlic/drinkingwater/Pages/Lawbook.aspx
Evaluation Guideline: |
Guideline Reference:
Spatial Representation: | Samples were collected from Pleasant Grove Creek at Crocker-Ranch East, at (Crocker-Ranch West), at Brewer Road, at Crocker Ranch - West Outfall, at Woodcreek Oaks Boulevard, at Fiddyment, at Industrial, at Petigrew, and at Pleasant Grove Boulevard
Temporal Representation: | The samples were collected between October 25, 2000 and October 24, 2004
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):

DECISION ID | 9716
Pollutant: | pH
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
Weight of Evidence: | This pollutant is being considered for listing under sections 3.2 of the Listing Policy. Under section 3.2 a single line of evidence is necessary to assess listing status. Data is available from 1 line of evidence for this pollutant. Based on the readily available data and information, the weight of evidence indicates that there is not sufficient justification for placing this water segment-pollution combination on the section 303(d) list. The recommendation is based on staff findings that 4 of 56 available concentrations exceeded the water quality objective and this does not exceed the allowable frequency using Table 3.2 of the Listing Policy. Table 3.2 of the listing policy recommends listing if a sample size of 56 has 10 or more samples that exceed the evaluation criteria. The data used satisfies the data quality requirements of section 6.1.4 of the Policy. The data used satisfies the data quantity requirements of section 6.1.5 of the Policy. 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: | 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 9716

LOE ID: | 21090
Pollutant: | pH
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Cold Freshwater Habitat
Aquatic Life Use: | Cold Freshwater Habitat
Number of Samples: | 56
Number of Exceedances: | 4
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | 4 of the 56 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for pH.
Data Reference: | SWAMP data entered by SWRCB into BDAT database
Water Quality Objective/Criterion: | pH levels should not be lower than 6.5 or higher than 8.5 (Basin Plan Objective)
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: |
Guideline Reference:
Spatial Representation: | Samples were collected at PG Ck (Crocker-Ranch East). Samples were collected at PG Ck (Crocker-Ranch West). Samples were collected at PG Creek @ Brewer Rd. Samples were collected at PG Creek @ Crocker Ranch - West Outfall. Samples were collected at PG Creek @ Woodcreek Oaks Blvd. Samples were collected at PGC @ Fiddyment. Samples were collected at PGC @ Industrial. Samples were collected at PGC @ Petigrew. Samples were collected at South Branch @ Pleasant Grove Blvd..
Temporal Representation: | The samples were collected from Oct 25 2000 to Oct 24 2004
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):

DECISION ID | 9715
Pollutant: | Oxygen, Dissolved
Final Listing Decision: | List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | New Decision
Revision Status | Revised
Sources: | Source Unknown
Expected TMDL Completion Date: | 2021
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for placement on the section 303(d) list under section 3.2 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 to assess this pollutant. Four hundred eighty-one of the samples exceed the water quality objective. 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. Four hundred eighty-one of 1291 samples exceed the Basin Plan objective of 7 mg/L and this exceeds the allowable frequency listed in Table 3.2 of the Listing Policy. Out of the total 1291 samples collected, 259 samples were collected downstream of the Pacific Grove Wastewater Treatment Plant's effluent outfall. Thirty out of the 259 samples collected downstream of the Pacific Grove Wastewater Treatment Plant's effluent outfall exceeded the Basin Plan objective. This listing only applies upstream of the Pacific Grove Wastewater Treatment Plant's effluent outfall. 4. 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: | After review of the available data and information, RWQCB 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 9715

LOE ID: | 21129
Pollutant: | Oxygen, Dissolved
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Cold Freshwater Habitat
Aquatic Life Use: | Cold Freshwater Habitat
Number of Samples: | 55
Number of Exceedances: | 22
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Twenty-two of the 55 samples collected by the Surface Water Ambient Monitoring Program exceeded the evaluation objective for Dissolved Oxygen.
Data Reference: | SWAMP data entered by SWRCB into BDAT database
Water Quality Objective/Criterion: | The Basin Plan Objective sets the minimum Dissolved Oxygen content at 7 mg/L.
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: |
Guideline Reference:
Spatial Representation: | Upstream sites: Pacific Grove Creek (Crocker-Ranch East), Pacific Grove Creek (Crocker-Ranch West), Pacific Grove Creek @ Brewer Road, Pacific Grove Creek @ Crocker Ranch - West Outfall, Pacific Grove Creek @ Woodcreek Oaks Blvd., Pacific Grove Creek @ Fiddyment, and Pacific Grove Creek @ Industrial. Downstream site: Pacific Grove Creek @ Petigrew.
Temporal Representation: | The samples were collected from October 2000 to October 2004.
Environmental Conditions: |
QAPP Information: | Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):
LOE ID: | 28181
Pollutant: | Oxygen, Dissolved
LOE Subgroup: | Pollutant-Water
Matrix: | Water
Fraction: | None
Beneficial Use: | Cold Freshwater Habitat
Number of Samples: | 1236
Number of Exceedances: | 459
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | City of Roseville dataset from the Pleasant Grove Wastewater Treatment Plant NPDES permit monitoring.
Data Reference: | Waste Discharge Requirements for the City of Roseville Pleasant Grove Wastewater Treatment Plant monitoring results.
Water Quality Objective/Criterion: | The Basin Plan objective of 7 mg/L for COLD beneficial use designation.
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: |
Guideline Reference:
Spatial Representation: | Upstream sites: Samples were collected at PS1 (12,000 feet upstream of outfall) and R1 (200 feet upstream of outfall). Downstream site: R2 (200 feet downstream of outfall).
Temporal Representation: | Samples were collected weekly from September 1999 to February 2009.
Environmental Conditions: |
QAPP Information: | Monitoring conducted in accordance with the Pleasant Grove Wastewater Treatment Plant NPDES permit.
QAPP Information Reference(s):

DECISION ID | 12424
Pollutant: | Pyrethroids
Final Listing Decision: | List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: | New Decision
Revision Status | Revised
Sources: | Urban Runoff/Storm Sewers
Expected TMDL Completion Date: | 2021
Impairment from Pollutant or Pollution: | Pollutant
Weight of Evidence: | This pollutant is being considered for placement on the section 303(d) list under section 3.1 of the Listing Policy. Under section 3.1 a single line of evidence is necessary to assess listing status. One lines of evidence are available in the administrative record to assess this pollutant. Three of the samples exceed the water quality objective. 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 7 samples exceed the narrative toxicity objective due to occurrences of statistically significant sediment toxicity and this exceeds the allowable frequency listed in Table 3.1 of the Listing Policy. Sediment-bound pyrethroid pesticide concentrations were used to calculate toxic units (TUs) of multiple pyrethroid pesticides observed in sediments. Pyrethroid TU analyses correlated with distribution and magnitude of toxicity. 4. All of the samples exceeding standards were from the Pleasant Grove Creek in the urbanized area upstream of Fiddyment Road. 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: | After review of the available data and information, RWQCB 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.
SWRCB Board Decision / Staff Recommendation: |
USEPA Decision: |

Lines of Evidence (LOEs) for Decision ID 12424

LOE ID: | 22962
Pollutant: | Pyrethroids
LOE Subgroup: | Pollutant-Sediment
Matrix: | Sediment
Fraction: | Total
Beneficial Use: | Warm Freshwater Habitat
Aquatic Life Use: | Warm Freshwater Habitat
Number of Samples: | 7
Number of Exceedances: | 3
Data and Information Type: | PHYSICAL/CHEMICAL MONITORING
Data Used to Assess Water Quality: | Three of seven statistically significant sediment toxicity testing samples violated the narrative toxicity objective. The three toxic (Mean mortality + standard deviation) sediment samples were collected from:Pleasant Grove Creek at Woodcreek Oaks Boulevard 9/24/04: 25+8Pleasant Grove Creek at 100 meters downstream of Parkside Way 10/24/04: 55+4011/07/04: 90+12Toxicity 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 Pleasant Grove Creek sediment samples demonstrated that the three toxic samples had pyrethroid pesticide concentrations that would be expected to be acutely toxic. The three toxic samples had 2-3 TUs of pyrethroids pesticides. The remainder of the seven samples from Pleasant Grove Creek where toxicity was not observed had pyrethroid TUs well below 1 TU in the creek sediments. 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 Pleasant Grove Creek included cyfluthrin, cypermethrin, deltamethrin, lambda-cyhalothrin, and permethrin.
Data Reference: | Five reports and 1 abstract (all PDFs) for SWAMP studies in the Lower Sacramento River: "R5SWAMP04-05_1.pdf" [Weston, D.P, R.W. Holmes, J. You, and M.J. Lydy. 2005. Aquatic toxicity due to residential use of pyrethroid insecticides. Environmental Science and Technology 39 (Dec. 15): 9778-9784.] "rb5_sedimentchem_rptmain.pdf" [Holmes, R.W. 2004. Monitoring of Sediment-bound Contaminants In the Lower Sacramento River Watershed Surface Water Ambient Monitoring Program (SWAMP) Lower Sacramento River Watershed, Final Report. Regional Water Quality Control Board - Central Valley Region. July 2004.]; "Sac_River_Benthic_Rpt.pdf" [Holmes, R.W., V. de Vlaming, D. Markiewicz, and K. Goding. 2005. Benthic Macroinvertebrate Colonization on Artificial Substrates in Agriculture-dominated Waterways of the Lower Sacramento River Watershed, Surface Water Ambient Monitoring Program (SWAMP) Lower Sacramento River Watershed. Regional Water Quality Control Board-Central Valley Region and U.C. Davis Aquatic Toxicology Laboratory and School of Veterinary Medicine. June 2005.]; "Sac_River_BioReport_Final.pdf" [V. de Vlaming, D. Markiwiecz, K. Goding, T. Kimball, and R. Holmes. Macroinvertebrate Assemblages in Agriculture- and Effluent-dominated Waterways of the Lower Sacramento River Watershed. Regional Water Quality Control Board-Central Valley Region, Moss Landing Laboratories, and U.C. Davis Aquatic Toxicology Laboratory and School of Veterinary Medicine.]; "sedimentchem.pdf" [R. W. Holmes. Monitoring of Sediment-bound Contaminants In the Lower Sacramento River Watershed Surface Water Ambient Monitoring Program (SWAMP) Lower Sacramento River Watershed, Final Report. Regional Water Quality Control Board - Central Valley Region. July 2004.]; "SWAMP03-04zooplankton_1.pdf" [V. de Vlaming, K. Goding, D. Markiwiecz, R. Wallace, and R. Holmes. Survey of Zooplankton Community Structure and Abundance in Agriculture-dominated Waterways in the Lower Sacramento River Watershed. Regional Water Quality Control Board-Central Valley Region and U.C. Davis Aquatic Toxicology Laboratory and School of Veterinary Medicine. May 2006.]
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. LC50 values, based on 10-day exposure to Hyallela azteca of pyrethroids in sediment samples, were used to determine Toxic Unit (TUs) for pyrethroids in sediments. Urban creek sediment sample pyrethroid concentrations were compared the TUs to determine exceedances.
Guideline Reference: | Methods for Measuring the Toxicity and Bioaccumulation of Sediment-associated Contaminants with Freshwater Invertebrates, Second Edition. U.S. Environmental Protection Agency Office of Research and Development, Duluth, MI , U.S. Environmental Protection Agency Office of Water, Washington, DC EPA-600/R-99/064
| Use and Toxicity of Pyrethroid Pesticides in the Central Valley, California, USA. Environmental Toxicology and Chemistry, 24:966-972, with erratum 24:No. 5
| Distribution and Toxicity of Sediment-Associated Pesticides in Agriculture-Dominated Water Bodies of Californias Central Valley
Spatial Representation: | Samples were collected from six locations along Pleasant Grove Creek in the City of Roseville from Industrial Boulevard on the upstream to Pleasant Grove Road on the downstream. Sediment toxicity was observed from three samples collected from the residential area at Woodcreek Oaks Boulevard and from the Crocker Ranch/Diamond Oaks area (100 meters downstream of Parkside Way) near stormwater outfalls. Two of the three samples were collected about one month apart from the mainstem Pleasant Grove Creek approximately 100 meters downstream of Parkside Way. Pyrethroid pesticides were generally not detected in the other sample locations except for small quantities of permethrin and bifenthrin.
Temporal Representation: | Samples were collected September 2004 - October 2004.Data collected during late summer.
Environmental Conditions: |
QAPP Information: | Data quality: Excellent.. Monitoring was conducted in accordance with the State Water Resources Control Board's Quality Assurance Program Plan for the State of California's Surface Water Ambient Monitoring Program.
QAPP Information Reference(s):