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

Supporting Information

Regional Board 8 - Santa Ana Region

Water Body Name: San Timoteo Creek Reach 3 (Yucaipa Creek to Headwaters)
Water Body ID: CAR8015200020011107145736
Water Body Type: River & Stream
 
DECISION ID
13213
 
Pollutant: 1,1,2,2-Tetrachloroethane | 1,1,2-Trichloroethane | 1,2,4-Trichlorobenzene | 1,2-Dichloroethane | 1,2-Dichloropropane | 2,4,6-Trichlorophenol | 2,4-Dichlorophenol | 2,4-Dinitrophenol | 2,4-Dinitrotoluene | 2,6-Dinitrotoluene | 2-Chloronaphthalene | 2-Nitrophenol | 4-Nitrophenol | Acenaphthene | Aldrin | Butyl benzyl phthalate | Carbon Disulfide | Chlorobenzene (mono) | Chloroform | DDT | Dichlorobenzene (mixed isomers) | Dieldrin | Diethyl phthalate | Endosulfan | Endrin | Heptachlor epoxide | Hexachlorobenzene/ HCB | Hexachlorobutadiene | Hexachlorocyclopentadiene | Hexachloroethane | Methoxychlor | Naphthalene | Nitrobenzene | Pentachlorophenol (PCP) | Phenol | Tetrachloroethylene/PCE | Toxaphene
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 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. None 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 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. None of twelve samples exceeded the California Toxics Rule or the US EPA National Ambient Water Quality Criteria Aquatic Toxicity Information Lowest Observed Affect Acute Level and this does not exceed 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 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 13213
 
LOE ID: 5740
 
Pollutant: 1,1,2,2-Tetrachloroethane | 1,1,2-Trichloroethane | 1,2,4-Trichlorobenzene | 1,2-Dichloroethane | 1,2-Dichloropropane | 2,4,6-Trichlorophenol | 2,4-Dichlorophenol | 2,4-Dinitrophenol | 2,4-Dinitrotoluene | 2,6-Dinitrotoluene | 2-Chloronaphthalene | 2-Nitrophenol | 4-Nitrophenol | Acenaphthene | Aldrin | Butyl benzyl phthalate | Carbon Disulfide | Chlorobenzene (mono) | Chloroform | DDT | Dichlorobenzene (mixed isomers) | Dieldrin | Diethyl phthalate | Endosulfan | Endrin | Heptachlor epoxide | Hexachlorobenzene/ HCB | Hexachlorobutadiene | Hexachlorocyclopentadiene | Hexachloroethane | Methoxychlor | Naphthalene | Nitrobenzene | Pentachlorophenol (PCP) | Phenol | Tetrachloroethylene/PCE | Toxaphene
LOE Subgroup: Pollutant-Water
Matrix: Water
Fraction: None
 
Beneficial Use: Wildlife Habitat
 
Number of Samples: 10
Number of Exceedances: 0
 
Data and Information Type: Fixed station physical/chemical (conventional plus toxic pollutants)
Data Used to Assess Water Quality: Ten samples were collected at one station, A, as follows: 10/2001, 1/2002, 4/2002, 7/2002, 4/2004, 1/2005, 4/2005, 11/2005, 1/2006, 4/2006 and none exceeded the guidelines.
Data Reference: San Bernardino County Flood Control District data from storm water program.
 
Water Quality Objective/Criterion: Santa Ana Region's Basin Plan Narrative Objective: The concentrations of toxic pollutants in the water column, sediments, or biota shall not adversely affect 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: US EPA National Water Quality Aquatic Toxicity Information Lowest Observed Affect Acute:Acenapthene 520 ug/l, butylbenzylphthalate 940 ug/l, bis (2-chloroethyl)ether 238,000 ug/l, bis(2-chloroisopropyl) ether 238,000 ug/l, 4-bromphenyl phenyl ether 360 ug/l, carbon disulfide 50,000 ug/l, 2-chloronaphthalene 1,600 ug/l, 2,4-dichlorophenol 2,200 ug/l, 2,4-dichlorophenol 330 ug/l, diethyl phthalate 940 ug/l, di-n-octyl phthalate 940 ug/l, 2,4-dinitrophenol 330 ug/l, 2,4- dinitrotoluene 330 ug/l, 2,6-dinitrotoluene 330 ug/l, hexachlorobenzene 250 ug/l, hexachlorobutadiene 90 ug/l, hexachlorocyclopentadiene 7 ug/l, hexachloroethane 980 ug/l, nitrobenzene 27,000 ug/l, 2-nitrophenol 230 ug/l, 4-nitrophenol 230 ug/l, phenol 10,200 ug/l, 2,4,5-trichlorobenzene 11,000 ug/l, 1,2,4-trichlorobenzene 250 ug/l; US EPA National Water Quality Aquatic Toxicity Information Lowest Observed Effect Chronic: butylbenzylphthalate 3 ug/l, bis(2-chloroethyl)ether 122 ug/l, bis(2-chloroisopropyl)ether 122 ug/l, carbon disulfide 50,000 ug/l, chloroform 1,240 ug/l, 1,2-dichlorobenzene 763 ug/l, 1,2-dichloropropane, 5,700 ug/l, diethyl phthalate 3 ug/l, di-n-octyl phthalate 3 ug/l, 2,4-dinitrophenol 230 ug/l, 2,4-dinitrotoluene 230 ug/l, 1,2,6-dinitrotoluene 230 ug/l, naphthalene 620 ug/l, 1,1,2,2-tetrachloroethane 2,400 ug/l, tetrachloroethylene 840 ug/l, 1,2,4-trichlorobenzene 50 ug/l, 1,1,2-trichloroethane 9,400 ug/l, 2,4,6-trichlorophenol 970 ug/l;US EPA National Ambient Water Quality Criteria Toxicity:chlorobenzene 680 ug/l, endosulfan 4-day avg. total 0.056 ug/l, heptachlorepoxide instantaneous maximum 0.52 ug/l, methoxychlor instantaneous maximum 0.03 ug/l; California Toxics Rule-aquatic life: Aldrin 3 ug/l, DDT instantaneous maximum 1.1 ug/l, dieldrin 4-day avg. 0.056 ug/l and 1-hr avg. 0.24 ug/l.
Guideline 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
 
Spatial Representation: The 10 samples were collected at one station, station A
Temporal Representation: Ten samples were collected at one station, A, as follows: 10/2001, 1/2002, 4/2002, 7/2002, 4/2004, 1/2005, 4/2005, 11/2005, 1/2006, 4/2006
Environmental Conditions:
QAPP Information: The quality assurance of this data is deemed appropriate because it was collected by an NPDES permitted discharger in compliance with its permit's monitoring and reporting program.
QAPP Information Reference(s):