## MEMORANDUM

TO: 2006 Effluent Guidelines Program Plan Docket, EPA Docket Number OW-2004-032

FROM: Ellie Codding and Deb Bartram, ERG

DATE: 12 August 2005

SUBJECT: Publicly Owned Treatment Works (POTW) Percent Removals Used for the TRIReleases2002 Database



## INTRODUCTION

Under the Clean Water Act (CWA), EPA establishes national technology-based regulations known as “effluent guidelines and pretreatment standards” to reduce pollutant discharges from categories of industry dischargi ng directly to waters of the United States or discharging indirectly through Publicly OwnedTreatment Works (POTWs). The CWA sections 301(d), 304(b), 304(g), and 307(b) require EPA to annually review these effluent guidelines and pretreatment standards. Part of this annual re view is a screening-level analysis of wastewater discharges. As one part of this analysis, EPA uses readily available information from the Toxics Release Inventory (TRI) to estimate the magnitude and toxicity of discharges from industrial facilities.

In TRI, facilities report annual loads released to the environment of each toxic chemical or chemical category that meets reporting requirements. TRI requires facilities to report on-site releases to air, receiving streams, underground wells, and disposal to land, and several othercategories. Facilities must also report the amount of toxic chemicals in wastes transferred to offsite locations, including discharges to POTWs and other off-site locations, such as commercial waste disposal facilities.

For facilities that reported transferring chemicals to POTWs in 2002, EPA used estimated average POTW performance to calculate the amount of a pollutant that is ultimately discharged to the receiving stream. This memorandum documents the pollutant removal efficiencies EPA used to estimate average POTW performance. EPA estimated removal efficiencies for the 612 chemicals required to be reported annually to TRI. EPA used the following equation to calculate the amount of pollutant discharged to receiving streams:

Discharge to Stream (lbs/yr) = [Transfer to POTW (lbs/yr)] × [1- POTW Removal (%)]

### MEMORANDUM 12 August 2005 Page 2

POTW Removal Efficiency Data Sources

In the previous version of the TRI database, TRIReleases2000 , EPA used the POTW removal efficiencies from EPA’s Office of Pollution Prevention and Toxics’ (OPPT) Risk Screening Environmental Indicators (RSEI) Model. Based on information provided by in Technical Appendix B to the RSEI User’s Manual [1 ], POTW removal efficiencies in this model were generally derived from data collected by EPA’s Risk Reduction Engineering Laboratory (RREL), now known as the National Risk Manage ment Research Laboratory (NRMRL). These data are compiled in the RREL Treatability Database maintained by the U.S. EPA Risk Reduction Engineering Laboratory [2].

For TRIReleases2002 , EPA updated the POTW removal efficiencies to incorporate the most recent data developed by the Office of Water’s Engineering and Analysis Division in support of promulgated effluent limitations guidelines and standards (ELG), as well as more recent data compiled by NRMRL [3]. EPA used removal efficiencies from the following data sources, listed in order of preference:

C 

### Recent ELG rulemakings;

C 

### EPA/ORD’s NRMRL Treatability Database, Version 5.0 (February 2004); and

C 

### EPA/OPPT’s Risk Screening Environmental Indicators (RSEI) model.

EPA retrieved POTW removal efficiencies from the documentation supporting the promulgation of the following ELG Point Source Categories:

• Centralized Waste Treaters (CWT); • Metal Products and Machinery (MPM); • Iron and Steel Manufacturing (I&S); • Industrial Laundries (IL); and • Transportation Equipment Cleaning (TEC).

Of the 612 TRI chemicals, EPA identified ELG POTW removal efficiencies for 81 chemicals and used other data sources for chemicals without ELG POTW removal efficiencies. Attachment A at the end of this memorandum lists the removal efficiencies used for the 612 TRI chemicals in TRIReleases2002 and their sources.

How POTW Removals are Calculated for Existing ELGs Identified Above

To estimate POTW removal efficiencies used in the analyses supporting the development of pretreatment standards, EPA generally uses data from the “50-POTW Study” [4] and the NRMRL Treatability Database, Version 5.0. The 50-POTW Study contains measured pollutant concentrations in domestic wastewater influent toand effluent from POTWs. These wastewaters include contributions from both domestic and industrial sources. Industrial sources comprised

### MEMORANDUM 12 August 2005 Page 3

between 1 and 65 percent of the flow entering the POTW, with an average industrial contribution of 23 percent. The NRMRL database contains measured pollutant concentrations in industrial and domestic wastewater influent to and effluentfrom a variety of treatment technologies. EPA generally estimates POTW removal efficiencies using the 50-POTW Study and NRMRL data with the following hierarchy:

1) Median POTW removal efficiency ba sed on 50-POTW Study data, where influent concentrations are greater than or equal to 10 times the analytical method minimum level (ML).

2) Median POTW removal efficiency ba sed on 50-POTW Study data, where influent concentrations are greater than or equal to two times the analytical method ML.

3) Median of biological treatment removal efficiency based on NRMRL domestic and industrial wastewater data together.

4) Transfer of POTW removal efficiency from a similar chemical (e.g., generic group removal such as dioxins/furans).

For additional information and data editing procedures, see Chapter 7 of the Development Document for Final Effluent Limitations Guidelines and Standards for the Centralized Waste Treatment Industry (EPA 821-R-00-020).

Where POTW removal efficiencies were not available for metal compounds, but were available for the parent metal, EPA used the parent metal removal efficiency to estimate the removal of metal compounds (e.g., used the removal for lead to estimate the removal for lead compounds). For nitrate compounds, the RSEI removal efficiency (90 percent) is the same as the removal efficiency used in the I&S ELG for Nitrite/Nitrates and TKN. EPA calculated this removal efficiency by collecting data from POTWs that receive steel mill wastewater.

Next Steps

Attachment A at the end of this memorandum lists the 612 POTW removal efficiencies used in TRIReleases2002 and their sources. Considerations for future refinements of POTW removals include the following:

• EPA identified removal efficiency data for acephate in the TEC rulemaking record, but the value cited was inconsistent with an earlier value cited in the pesticides rulemaking record. Therefore, EPA used the RSEI removal efficiency (45 percent), but recommends further review.

### MEMORANDUM 12 August 2005 Page 4

• EPA recommends further research on POTW removals for chemicals with high TWPE, especially sodium nitrite and chlorine.

• EPA recommends development of POTW removal efficiencies for chemicals with no available ELG or RSEI data, such as creosote and diisocyanates.

In addition, EPA has initiated a new study of POTW performance. EPA is currently evaluating published literature on the efficiency of POTW treatment systems to remove pollutants entering the treatment system, including emerging contaminants such as pharmaceuticals and personal care products. EPA is also collecting and evaluating available treatment data reported by POTWs as part of their permit application or annual reporting requirements. In addition, EPA has initiated limited POTW site visits and field sampling activities based on the voluntary participation of selected facilities.

References

1. U.S. EPA, User’s Manual for RSEI Version 2.1.2 [1988-2002 TRI Data] , Office of Pollution Prevention and Toxics, Washington DC, August 2004.

2. U.S. EPA, RREL Treatability Database , Office of Research and Development, Cincinnati OH, 1994.

3. U.S. EPA, NRMRL Treatability Data Base, Version 5.0(EPA 600/C-93/003a), Office of Research and Development, Cincinnati OH, February 2004.

4. U.S. EPA, Fate of Priority Pollutants in Publicly Owned Treatment Works(EPA 440/1- 82/303), Effluent Guidelines Divi sion, Washington DC, September 1982.

### MEMORANDUM 12 August 2005 Page 5

Attachment A: List of POTW Removals

Chemical POTW % Removal Primary Data Source 1,2 Secondary Data Source 1 1-(3-chloroallyl)-3,5,7-triaza-1- azoniaadamantane 45 RSEI/NRMRL RSEI

1-Amino-2-methyl-anthraquinone 86 RSEI/NRMRL RSEI 1-Bromo-1-(bromomethyl)-1,3- propanedicarbonitrile 46 RSEI/NRMRL RSEI

1-Chloro-1,1-difluoroethane 97 RSEI/NRMRL RSEI 1-Chloro-1,1,2,2-tetrafluoroethane 99.5 RSEI/NRMRL RSEI 1,1-Dichloro-1-fluoroethane 91 RSEI/NRMRL RSEI 1,1-Dichloro-1,2,2-trifluoroethane (HCFC-123b) 97 RSEI/NRMRL RSEI 1,1-Dichloro-1,2,2,3,3-pentafluoropropane (HCFC-22 99.5 RSEI/NRMRL RSEI

1,1-Dichloro-1,2,3,3,3-pentafluoropropane (HCFC-22 99.5 RSEI/NRMRL RSEI

1,1-Dimethyl Hydrazine 75 RSEI/NRMRL RSEI 1,1,1-Trichloroethane 90 50 POTW Study TEC 1,1,1,2-Tetrachloro-2-fluoroethane (HCFC-121a) 62 RSEI/NRMRL RSEI 1,1,1,2-Tetrachloroethane 59 RSEI/NRMRL RSEI 1,1,2-Trichloroethane 40 RSEI/NRMRL RSEI 1,1,2,2-Tetrachloro-1-fluoroethane (HCFC-121) 62 RSEI/NRMRL RSEI 1,1,2,2-Tetrachloroethane 33 RSEI/NRMRL RSEI 1,2-Butylene oxide 76 RSEI/NRMRL RSEI 1,2-Dibromo-3-chloropropane (DBCP) 33 RSEI/NRMRL RSEI 1,2-Dibromoethane 54 RSEI/NRMRL RSEI 1,2-Dibromotetrafluoroethane 98 RSEI/NRMRL RSEI 1,2-Dichloro-1,1-difluoroethane 95 RSEI/NRMRL RSEI 1,2-Dichloro-1,1,2-trifluoroethane 97 RSEI/NRMRL RSEI 1,2-Dichloro-1,1,2,3,3-pentafluoropropane (HCFC-22 99.5 RSEI/NRMRL RSEI

1,2-Dichloro-1,1,3,3,3-pentafluoropropane (HCFC-22 99.5 RSEI/NRMRL RSEI

1,2-Dichlorobenzene 89 Pesticides Manual 5 TEC 1,2-Dichloroethane 89 NRMRL CWT 1,2-Dichloroethylene 72 RSEI/NRMRL RSEI 1,2-Dichloropropane 68 RSEI/NRMRL RSEI 1,2-Diphenylhydrazine 62 50 POTW IL 1,2-Phenylenediamine dihydrochloride 45 RSEI/NRMRL RSEI 1,2-Phenylenediamine 45 RSEI/NRMRL RSEI 1,2,3-Trichloropropane 52 RSEI/NRMRL RSEI 1,2,4-Trichlorobenzene 86 RSEI/NRMRL RSEI 1,2,4-Trimethylbenzene 94 RSEI/NRMRL RSEI 1,3-Butadiene 97 RSEI/NRMRL RSEI 1,3-Dichloro-1,1,2,2,3-pentafluoropropane 99.5 RSEI/NRMRL RSEI 1,3-Dichloro-1,1,2,3,3-pentafluoropropane 99.5 RSEI/NRMRL RSEI

### MEMORANDUM 12 August 2005 Page 6

Chemical POTW % Removal Primary Data Source 1,2 Secondary Data Source 1 (HCFC-22 1,3-Dichlorobenzene 77 RSEI/NRMRL RSEI 1,3-Dichloropropylene 83 RSEI/NRMRL RSEI 1,3-Phenylenediamine 45 RSEI/NRMRL RSEI 1,4-Dichloro-2-butene 90 RSEI/NRMRL RSEI 1,4-Dichlorobenzene 75 RSEI/NRMRL RSEI 1,4-Phenylenediamine dihydrochloride 45 RSEI/NRMRL RSEI 2-Acetylaminofluorene 58 RSEI/NRMRL RSEI 2-Aminoanthraquinone 48 RSEI/NRMRL RSEI 2-Chloro-1,1,1-trifluoroethane 99 RSEI/NRMRL RSEI 2-Chloro-1,1,1,2-tetrafluoroethane 99.5 RSEI/NRMRL RSEI 2-Chloroacetophenone 46 RSEI/NRMRL RSEI 2-Ethoxyethanol 92 RSEI/NRMRL RSEI 2-Mercaptobenzothiazole 48 RSEI/NRMRL RSEI 2-Methoxyethanol 92 RSEI/NRMRL RSEI 2-Methyllactonitrile 99.95 RSEI/NRMRL RSEI 2-Methylpyridine 92 RSEI/NRMRL RSEI 2-Nitrophenol 27 50 POTW Study MPM 2-Nitropropane 76 RSEI/NRMRL RSEI 2-Phenylphenol 95 RSEI/NRMRL RSEI 2,2-Dichloro-1,1,1-trifluoroethane 97 RSEI/NRMRL RSEI 2,2-Dichloro-1,1,1,3,3-pentafluoropropane (HCFC-22 99.5 RSEI/NRMRL RSEI

2,3-Dichloro-1,1,1,2,3-pentafluoropropane (HCFC-22 99.5 RSEI/NRMRL RSEI

2,3-Dichloropropene 66 RSEI/NRMRL RSEI 2,3,5-trimethylphenyl methylcarbamate 78 RSEI/NRMRL RSEI 2,4-D chlorocrotyl ester 99.7 RSEI/NRMRL RSEI 2,4-D butyl ester 99.6 RSEI/NRMRL RSEI 2,4-D isopropyl ester 98 RSEI/NRMRL RSEI 2,4-D 2-ethylhexyl ester 99.99 RSEI/NRMRL RSEI 2,4-D butoxyethyl ester 99 RSEI/NRMRL RSEI 2,4-D, propylene glycol butyl ether ester 99.6 RSEI/NRMRL RSEI 2,4-D sodium salt 94 RSEI/NRMRL RSEI 2,4-D ((2,4-dichlorophenoxy)acetic acid) 49 NRMRL TEC 2,4-D 2-ethyl-4-methylpentyl ester 99.97 RSEI/NRMRL RSEI 2,4-DB 89 RSEI/NRMRL RSEI 2,4-Diaminoanisole sulfate 45 RSEI/NRMRL RSEI 2,4-Diaminoanisole 45 RSEI/NRMRL RSEI 2,4-Diaminotoluene 45 RSEI/NRMRL RSEI 2,4-Dichlorophenol 95 RSEI/NRMRL RSEI 2,4-Dimethylphenol 51 50-POTW 2 × ML I&S 2,4-Dinitrophenol 78 50 POTW/NRMRL Average 3 MPM

2,4-Dinitrotoluene 47 RSEI/NRMRL RSEI

### MEMORANDUM 12 August 2005 Page 7

Chemical POTW % Removal Primary Data Source 1,2 Secondary Data Source 1 2,4-Dithiobiuret 49 RSEI/NRMRL RSEI 2,4-DP (Dichlorprop) 66 RSEI/NRMRL RSEI 2,4,5-Trichlorophenol 75 RSEI/NRMRL RSEI 2,4,6-Trichlorophenol 28 NRMRL CWT 2,6-Dinitrotoluene 78 50 POTW/NRMRL Average 3 MPM

2,6-Xylidine 47 RSEI/NRMRL RSEI 3-Chloro-1,1,1-trifluoropropane (HCFC-253fb) 99 RSEI/NRMRL RSEI 3-Chloro-2-methyl-1-propene 96 RSEI/NRMRL RSEI 3-Chloropropionitrile 46 RSEI/NRMRL RSEI 3-Iodo-2-propynyl butylcarbamate 77 RSEI/NRMRL RSEI 3,3'-Dichlorobenzidine dihydrochloride 68 RSEI/NRMRL RSEI 3,3'-Dichlorobenzidine sulfate 68 RSEI/NRMRL RSEI 3,3'-Dichlorobenzidine 68 RSEI/NRMRL RSEI 3,3'-Dimethoxybenzidine hydrochloride 46 RSEI/NRMRL RSEI 3,3'-Dimethoxybenzidine dihydrochloride 46 RSEI/NRMRL RSEI 3,3'-Dimethoxybenzidine 46 RSEI/NRMRL RSEI 3,3'-Dimethylbenzidine dihydrochloride 55 RSEI/NRMRL RSEI 3,3'-Dimethylbenzidine 77 RSEI/NRMRL RSEI 3,3'-Dimethylbenzidine dihydrofluoride 48 RSEI/NRMRL RSEI 3,3-Dichloro-1,1,1,2,2-pentafluoropropane (HCFC-22 99.5 RSEI/NRMRL RSEI

4-Aminoazobenzene 65 RSEI/NRMRL RSEI 4-Aminodiphenyl 53 RSEI/NRMRL RSEI 4-Dimethylaminoazobenzene 96 RSEI/NRMRL RSEI 4-Nitrobiphenyl 93 RSEI/NRMRL RSEI 4-Nitrophenol 78 50 POTW/NRMRL Average 3 MPM

4,4'-Diaminodiphenylether 76 RSEI/NRMRL RSEI 4,4'-Diphenylmethane diisocyanate 99.99 RSEI/NRMRL RSEI 4,4'-Isopropylidenediphenol 86 RSEI/NRMRL RSEI 4,4'-Methylenebis(2-chloroaniline) 82 RSEI/NRMRL RSEI 4,4'-Methylenebis(N,N-dimethylbenzenamine) 93 RSEI/NRMRL RSEI 4,4'-Methylenedianiline 75 RSEI/NRMRL RSEI 4,4'-Thiodianiline 47 RSEI/NRMRL RSEI 4,6-Dinitro-o-cresol 47 RSEI/NRMRL RSEI 5-Nitro-o-anisidine 46 RSEI/NRMRL RSEI 5-Nitro-o-toluidine 46 RSEI/NRMRL RSEI Abamectin 98 RSEI/NRMRL RSEI Acephate 45 RSEI/NRMRL RSEI Acetaldehyde 92 RSEI/NRMRL RSEI Acetamide 92 RSEI/NRMRL RSEI Acetonitrile 75 RSEI/NRMRL RSEI Acetophenone 95 NRMRL CWT Acifluorfen, sodium salt 75 RSEI/NRMRL RSEI

### MEMORANDUM 12 August 2005 Page 8

Chemical POTW % Removal Primary Data Source 1,2 Secondary Data Source 1 Acrolein 78 50 POTW/NRMRL Average 3 MPM

Acrylamide 92 RSEI/NRMRL RSEI Acrylic acid 92 RSEI/NRMRL RSEI Acrylonitrile 95 NRMRL TEC Alachlor 89 RSEI/NRMRL RSEI Aldicarb 46 RSEI/NRMRL RSEI Aldrin 99 RSEI/NRMRL RSEI Allyl alcohol 92 RSEI/NRMRL RSEI Allyl chloride 84 RSEI/NRMRL RSEI Allylamine 75 RSEI/NRMRL RSEI alpha-Hexachlorocyclohexane 85 50 POTW TEC alpha-Naphthylamine 76 RSEI/NRMRL RSEI Aluminum phosphide 2 RSEI/NRMRL RSEI Aluminum oxide (fibrous forms) 2 RSEI/NRMRL RSEI Aluminum (fume or dust) 91 50 POTW I&S Ametryn 55 RSEI/NRMRL RSEI Amitraz 99 RSEI/NRMRL RSEI Amitrole 45 RSEI/NRMRL RSEI Ammonia 39 50 POTW I&S Ammonium sulfate 2 RSEI/NRMRL RSEI Ammonium nitrate (solution) 2 RSEI/NRMRL RSEI Anilazine 81 RSEI/NRMRL RSEI Aniline 93 NRMRL CWT Anthracene 96 50 POTW - 10 X ML CWT Antimony compounds 67 50 POTW - 2 X ML CWT Antimony 67 50 POTW - 2 X ML CWT Arsenic 66 50 POTW - 2 X ML CWT Arsenic compounds 66 50 POTW - 2 X ML CWT Asbestos (friable) RSEI/NRMRL RSEI Atrazine 26 RSEI/NRMRL RSEI Auramine 50 RSEI/NRMRL RSEI Barium 55 50 POTW - 2 X ML CWT Barium compounds 55 50 POTW - 2 X ML CWT Bendiocarb 77 RSEI/NRMRL RSEI Benfluralin 97 RSEI/NRMRL RSEI Benomyl 51 RSEI/NRMRL RSEI Benzal chloride 99.99 RSEI/NRMRL RSEI Benzamide 92 RSEI/NRMRL RSEI Benzene 95 NRMRL CWT Benzidine 75 RSEI/NRMRL RSEI Benzo(g,h,i)perylene RSEI/NRMRL RSEI Benzotrichloride 100 RSEI/NRMRL RSEI Benzoyl peroxide 97 RSEI/NRMRL RSEI Benzoyl chloride 100 RSEI/NRMRL RSEI

### MEMORANDUM 12 August 2005 Page 9

Chemical POTW % Removal Primary Data Source 1,2 Secondary Data Source 1 Benzyl chloride 78 RSEI/NRMRL RSEI Beryllium 61 NRMRL CWT Beryllium compounds 61 NRMRL CWT beta-Naphthylamine 77 RSEI/NRMRL RSEI beta-Propiolactone 96 RSEI/NRMRL RSEI Bifenthrin 99.9 RSEI/NRMRL RSEI Biphenyl 96 NRMRL CWT Bis(2-chloro-1-methethyl)ether 50 RSEI/NRMRL RSEI Bis(2-chloroethoxy)methane 23 RSEI/NRMRL RSEI Bis(2-chloroethyl)ether 23 RSEI/NRMRL RSEI Bis(chloromethyl)ether 100 RSEI/NRMRL RSEI Bis(tributyltin) oxide 91 RSEI/NRMRL RSEI Boron trifluoride 2 RSEI/NRMRL RSEI Boron trichloride 2 RSEI/NRMRL RSEI Bromacil 47 RSEI/NRMRL RSEI Bromacil lithium salt 46 RSEI/NRMRL RSEI Bromine 2 RSEI/NRMRL RSEI Bromochlorodifluoromethane 97 RSEI/NRMRL RSEI Bromoform (Tribromomethane) 55 RSEI/NRMRL RSEI Bromomethane (Methyl bromide) 77 RSEI/NRMRL RSEI Bromotrifluoromethane (Halon 1301) 99 RSEI/NRMRL RSEI Bromoxynil 87 RSEI/NRMRL RSEI Bromoxynil octanoate 99.9 RSEI/NRMRL RSEI Brucine 46 RSEI/NRMRL RSEI Butyl acrylate 93 RSEI/NRMRL RSEI Butyraldehyde 92 RSEI/NRMRL RSEI C.I. Direct Brown 95 99.7 RSEI/NRMRL RSEI C.I. Direct Black 38 98 RSEI/NRMRL RSEI C.I. Food Red 5 49 RSEI/NRMRL RSEI C.I. Disperse Yellow 3 84 RSEI/NRMRL RSEI C.I. Basic Red 1 99.5 RSEI/NRMRL RSEI C.I. Acid Green 3 45 RSEI/NRMRL RSEI C.I. Acid Red 114 99.9 RSEI/NRMRL RSEI C.I. Direct Blue 218 RSEI/NRMRL RSEI C.I. Solvent Orange 7 99.7 RSEI/NRMRL RSEI C.I. Vat Yellow 4 99 RSEI/NRMRL RSEI C.I. Food Red 15 46 RSEI/NRMRL RSEI C.I. Basic Green 4 45 RSEI/NRMRL RSEI C.I. Solvent Yellow 3 91 RSEI/NRMRL RSEI C.I. Direct Blue 6 54 RSEI/NRMRL RSEI C.I. Solvent Yellow 14 99 RSEI/NRMRL RSEI Cadmium 90 50 POTW - 10 X ML CWT Cadmium compounds 90 50 POTW - 10 X ML CWT Calcium cyanamide 2 RSEI/NRMRL RSEI Captan 77 RSEI/NRMRL RSEI

### MEMORANDUM 12 August 2005 Page 10

Chemical POTW % Removal Primary Data Source 1,2 Secondary Data Source 1 Carbaryl 93 RSEI/NRMRL RSEI Carbofuran 93 RSEI/NRMRL RSEI Carbon disulfide 84 NRMRL MPM Carbon tetrachloride 93 RSEI/NRMRL RSEI Carbonyl sulfide 96 RSEI/NRMRL RSEI Carboxin 76 RSEI/NRMRL RSEI Catechol 92 RSEI/NRMRL RSEI CFC 114 (1,2-dichloro,1,1,2,2-tetraf luoroethane) 99.9 RSEI/NRMRL RSEI CFC 115 (chloropentafluoroethane) 99.9 RSEI/NRMRL RSEI CFC-11 (trichlorofluoromethane) 77 50 POTW/NRMRL Average 3 MPM

CFC-12 (dichlorodifluoromethane) 99 RSEI/NRMRL RSEI Chinomethionat (6-methyl-1,3-dithiolo[4,5- b]quinox 77 RSEI/NRMRL RSEI

Chloramben 46 RSEI/NRMRL RSEI Chlordane 99 RSEI/NRMRL RSEI Chlorendic acid 33 RSEI/NRMRL RSEI Chlorimuron ethyl 77 RSEI/NRMRL RSEI Chlorine dioxide 2 RSEI/NRMRL RSEI Chlorine 1.87 RSEI/NRMRL RSEI Chloroacetic acid 92 RSEI/NRMRL RSEI Chlorobenzene 96 50 POTW Study MPM Chlorobenzilate 97 RSEI/NRMRL RSEI Chlorodifluoromethane (HCFC-22) 61 RSEI/NRMRL RSEI Chloroethane (Ethyl chloride) 78 50 POTW/NRMRL Average 3 MPM

Chloroform 73 NRMRL CWT Chloromethane 88 RSEI/NRMRL RSEI Chloromethyl methyl ether 100 RSEI/NRMRL RSEI Chlorophenols 96 RSEI/NRMRL RSEI Chloropicrin 62 RSEI/NRMRL RSEI Chloroprene 96 RSEI/NRMRL RSEI Chlorotetrafluoroethane 99.5 RSEI/NRMRL RSEI Chlorothalonil 82 RSEI/NRMRL RSEI Chlorotrifluoromethane 99.8 RSEI/NRMRL RSEI Chlorpyrifos methyl 98 RSEI/NRMRL RSEI Chlorsulfuron 47 RSEI/NRMRL RSEI Chromium 80 50 POTW - 10 X ML CWT Chromium compounds 80 50 POTW - 10 X ML CWT Cobalt compounds 10 50 POTW -2 X ML CWT Cobalt 10 50 POTW -2 X ML CWT Copper compounds 84 50 POTW - 10 X ML CWT Copper 84 50 POTW - 10 X ML CWT Creosote, coal tar RSEI/NRMRL RSEI Cresol (mixed isomers) 92 RSEI/NRMRL RSEI

### MEMORANDUM 12 August 2005 Page 11

Chemical POTW % Removal Primary Data Source 1,2 Secondary Data Source 1 Crotonaldehyde 92 RSEI/NRMRL RSEI Cumene 98 RSEI/NRMRL RSEI Cumene hydroperoxide 76 RSEI/NRMRL RSEI Cupferron 22 RSEI/NRMRL RSEI Cyanazine 24 RSEI/NRMRL RSEI Cyanide compounds 70.00 50 POTW 10 X ML CWT Cycloate 94 RSEI/NRMRL RSEI Cyclohexane 89 RSEI/NRMRL RSEI Cyclohexanol 92 RSEI/NRMRL RSEI Cyfluthrin 99.9 RSEI/NRMRL RSEI Cyhalothrin 99.6 RSEI/NRMRL RSEI D-trans-allethrin (D-trans-chrysanthemic acid of D 99 RSEI/NRMRL RSEI

Dazomet 97 RSEI/NRMRL RSEI Dazomet, sodium salt 46 RSEI/NRMRL RSEI Decabromodiphenyl ether 99 RSEI/NRMRL RSEI Desmedipham 91 RSEI/NRMRL RSEI Di(2-ethylhexyl) phthalate 60 50 POTW - 10 X ML CWT Diallate 86 RSEI/NRMRL RSEI Diaminotoluene (mixed isomers) 85 RSEI/NRMRL RSEI Diazinon 93 RSEI/NRMRL RSEI Diazomethane 92 RSEI/NRMRL RSEI Dibenzofuran 98 NRMRL I&S Dibutyl phthalate 85 50 POTW - 10 xML CWT Dicamba 47 RSEI/NRMRL RSEI Dichloran 51 RSEI/NRMRL RSEI Dichloro-1,1,2-trifluoroethane 97 RSEI/NRMRL RSEI Dichlorobenzene (mixed isomers) 75 RSEI/NRMRL RSEI Dichlorobromomethane 64 RSEI/NRMRL RSEI Dichlorofluoromethane 71 RSEI/NRMRL RSEI Dichloromethane 54 NRMRL CWT Dichloropentafluoropropane 99.5 RSEI/NRMRL RSEI Dichlorophene 78 RSEI/NRMRL RSEI Dichlorotrifluoroethane 97 RSEI/NRMRL RSEI Dichlorvos 75 RSEI/NRMRL RSEI Diclofop methyl 96 RSEI/NRMRL RSEI Dicofol 98 RSEI/NRMRL RSEI Dicyclopentadiene 97 RSEI/NRMRL RSEI Diepoxybutane 75 RSEI/NRMRL RSEI Diethanolamine 92 RSEI/NRMRL RSEI Diethatyl ethyl 90 RSEI/NRMRL RSEI Diethyl sulfate 95 RSEI/NRMRL RSEI Diflubenzuron 94 RSEI/NRMRL RSEI Diglycidyl resorcinol ether 75 RSEI/NRMRL RSEI Dihydrosafrole 71 RSEI/NRMRL RSEI

### MEMORANDUM 12 August 2005 Page 12

Chemical POTW % Removal Primary Data Source 1,2 Secondary Data Source 1 Diisocyanates RSEI/NRMRL RSEI Dimethipin 45 RSEI/NRMRL RSEI Dimethoate 45 RSEI/NRMRL RSEI Dimethyl chlorothiophosphate 97 RSEI/NRMRL RSEI Dimethyl sulfate 97 RSEI/NRMRL RSEI Dimethyl phthalate 78 50 POTW/NRMRL Average 3 MPM

Dimethylamine 92 RSEI/NRMRL RSEI Dimethylamine dicamba 46 RSEI/NRMRL RSEI Dimethylcarbamyl chloride 100 RSEI/NRMRL RSEI Dinitrobutyl phenol (Dinoseb) 46 RSEI/NRMRL RSEI Dinitrotoluene (mixed isomers) 47 RSEI/NRMRL RSEI Dinocap 99.6 RSEI/NRMRL RSEI Dioxane 46 NRMRL MPM Dioxin and dioxin-like compounds 83 Transfer from 1,2,3,4,6,7,8-HPCDF (Source: NRMRL) 4 TEC

Diphenamid 53 RSEI/NRMRL RSEI Diphenylamine 77 50 POTW/NRMRL Average 3 MPM

Dipotassium endothall 76 RSEI/NRMRL RSEI Dipropyl isocinchomeronate 97 RSEI/NRMRL RSEI Disodium cyanodithioimidocarbonate 78 RSEI/NRMRL RSEI Diuron 51 RSEI/NRMRL RSEI Dodine 75 RSEI/NRMRL RSEI Epichlorohydrin 46 RSEI/NRMRL RSEI Ethoprop 71 RSEI/NRMRL RSEI Ethyl chloroformate 82 RSEI/NRMRL RSEI Ethyl acrylate 92 RSEI/NRMRL RSEI Ethyl dipropylthiocarbamate 60 RSEI/NRMRL RSEI Ethylbenzene 94 NRMRL CWT Ethylene glycol 92 RSEI/NRMRL RSEI Ethylene 99 RSEI/NRMRL RSEI Ethylene thiourea 45 RSEI/NRMRL RSEI Ethylene oxide 92 RSEI/NRMRL RSEI Ethylenebisdithiocarbamic acid, salts and esters 2 RSEI/NRMRL RSEI Ethyleneimine (Aziridine) 46 RSEI/NRMRL RSEI Ethylidene dichloride 70 50 POTW Study MPM Famphur 76 RSEI/NRMRL RSEI Fenarimol 71 RSEI/NRMRL RSEI Fenbutatin oxide (Vendex) 94 RSEI/NRMRL RSEI Fenoxaprop ethyl 99.6 RSEI/NRMRL RSEI Fenoxycarb 98 RSEI/NRMRL RSEI Fenpropathrin 99.9 RSEI/NRMRL RSEI Fenthion 96 RSEI/NRMRL RSEI

### MEMORANDUM 12 August 2005 Page 13

Chemical POTW % Removal Primary Data Source 1,2 Secondary Data Source 1 Fenvalerate 99.6 RSEI/NRMRL RSEI Ferbam 45 RSEI/NRMRL RSEI Fluazifop butyl 99.8 RSEI/NRMRL RSEI Fluometuron 48 RSEI/NRMRL RSEI Fluorine 2 RSEI/NRMRL RSEI Fluorouracil (5-fluorouracil) 45 RSEI/NRMRL RSEI Fluvalinate 99.9 RSEI/NRMRL RSEI Folpet 80 RSEI/NRMRL RSEI Fomesafen 53 RSEI/NRMRL RSEI Formaldehyde 92 RSEI/NRMRL RSEI Formic acid 92 RSEI/NRMRL RSEI Freon 113 99.5 RSEI/NRMRL RSEI Glycol ethers 92 RSEI/NRMRL RSEI Heptachlor 99 RSEI/NRMRL RSEI Hexachloro-1,3-butadiene 95 RSEI/NRMRL RSEI Hexachlorobenzene 98 RSEI/NRMRL RSEI Hexachlorocyclopentadiene 99 RSEI/NRMRL RSEI Hexachloroethane 77 RSEI/NRMRL RSEI Hexachloronaphthalene 99 RSEI/NRMRL RSEI Hexachlorophene 99 RSEI/NRMRL RSEI Hexamethylphosphoramide 45 RSEI/NRMRL RSEI Hexazinone 85 RSEI/NRMRL RSEI Hydramethylnon 99.7 RSEI/NRMRL RSEI Hydrazine 85 RSEI/NRMRL RSEI Hydrazine sulfate 2 RSEI/NRMRL RSEI Hydrochloric acid 100 RSEI/NRMRL RSEI Hydrogen cyanide 7 RSEI/NRMRL RSEI Hydrogen fluoride 2 RSEI/NRMRL RSEI Hydroquinone 92 RSEI/NRMRL RSEI Imazalil 79 RSEI/NRMRL RSEI Iron pentacarbonyl RSEI/NRMRL RSEI Isobutyraldehyde 92 RSEI/NRMRL RSEI Isodrin 99 RSEI/NRMRL RSEI Isofenphos 96 RSEI/NRMRL RSEI Isopropyl alcohol 92 RSEI/NRMRL RSEI Isosafrole 64 RSEI/NRMRL RSEI Lactofen 99 RSEI/NRMRL RSEI Lead compounds 77 50 POTW - 10 X ML CWT Lead 77 50 POTW - 10 X ML CWT Lindane 75 50 POTW STUDY TEC Linuron 59 RSEI/NRMRL RSEI Lithium carbonate 2 RSEI/NRMRL RSEI m-Cresol 92 RSEI/NRMRL RSEI m-Dinitrobenzene 46 RSEI/NRMRL RSEI m-Xylene 65 NRMRL CWT

### MEMORANDUM 12 August 2005 Page 14

Chemical POTW % Removal Primary Data Source 1,2 Secondary Data Source 1 Malathion 93 RSEI/NRMRL RSEI Maleic anhydride 100 RSEI/NRMRL RSEI Malononitrile 45 RSEI/NRMRL RSEI Maneb 2 RSEI/NRMRL RSEI Manganese 41 NRMRL CWT Manganese compounds 41 NRMRL CWT Mecoprop 58 RSEI/NRMRL RSEI Mercury 90 50 POTW - 10 X ML CWT Mercury compounds 90 50 POTW - 10 X ML CWT Merphos 99.99 RSEI/NRMRL RSEI Methacrylonitrile 76 RSEI/NRMRL RSEI Metham sodium 76 RSEI/NRMRL RSEI Methanol 92 RSEI/NRMRL RSEI Methazole 60 RSEI/NRMRL RSEI Methiocarb 81 RSEI/NRMRL RSEI Methoxone sodium salt 75 RSEI/NRMRL RSEI Methoxone (MCPA) 61 RSEI/NRMRL RSEI Methoxychlor 99 RSEI/NRMRL RSEI Methyl tert-butyl ether 53 RSEI/NRMRL RSEI Methyl iodide 75 RSEI/NRMRL RSEI Methyl methacrylate 99.96 NRMRL MPM Methyl isothiocyanate 99.96 RSEI/NRMRL RSEI Methyl isocyanate 99.95 RSEI/NRMRL RSEI Methyl hydrazine 75 RSEI/NRMRL RSEI Methyl isobutyl ketone 88 NRMRL CWT Methyl ethyl ketone 97 NRMRL CWT Methyl acrylate 92 RSEI/NRMRL RSEI Methyl parathion 94 RSEI/NRMRL RSEI Methyl chlorocarbonate 99.6 RSEI/NRMRL RSEI Methylene bromide 56 RSEI/NRMRL RSEI Metiram 2 RSEI/NRMRL RSEI Metribuzin 46 RSEI/NRMRL RSEI Mevinphos 92 RSEI/NRMRL RSEI Michlers Ketone 60 RSEI/NRMRL RSEI Molinate 60 RSEI/NRMRL RSEI Molybdenum trioxide 3 RSEI/NRMRL RSEI Monuron 23 RSEI/NRMRL RSEI Mustard gas 99.99 RSEI/NRMRL RSEI Myclobutanil 68 RSEI/NRMRL RSEI n-Butyl alcohol 92 RSEI/NRMRL RSEI n-Hexane 99.9 RSEI/NRMRL RSEI N-methyl-2-pyrrolidone 92 RSEI/NRMRL RSEI N-methylolacrylamide 92 RSEI/NRMRL RSEI N-Nitroso-N-ethylurea 45 RSEI/NRMRL RSEI N-Nitroso-N-methylurea 45 RSEI/NRMRL RSEI

### MEMORANDUM 12 August 2005 Page 15

Chemical POTW % Removal Primary Data Source 1,2 Secondary Data Source 1 N-Nitrosodi-n-butylamine 47 RSEI/NRMRL RSEI N-Nitrosodi-n-propylamine 46 RSEI/NRMRL RSEI N-Nitrosodiethylamine 22 RSEI/NRMRL RSEI N-Nitrosodimethylamine 78 50 POTW/NRMRL Average 3 MPM

N-Nitrosodiphenylamine 90 NRMRL MPM N-Nitrosomethylvinylamine 59 RSEI/NRMRL RSEI N-Nitrosomorpholine 45 RSEI/NRMRL RSEI N-Nitrosonornicotine 45 RSEI/NRMRL RSEI N-Nitrosopiperidine 77 50 POTW/NRMRL Average 3 MPM

Nabam 90 RSEI/NRMRL RSEI Naled 75 RSEI/NRMRL RSEI Naphthalene 95 50 POTW - 10 × ML I&S Nickel 51 50 POTW - 10 X ML CWT Nickel compounds 51 50 POTW - 10 X ML CWT Nicotine and salts 2 RSEI/NRMRL RSEI Nitrapyrin 66 RSEI/NRMRL RSEI Nitrate compounds 90 RSEI/NRMRL RSEI Nitric acid 100 RSEI/NRMRL RSEI Nitrilotriacetic acid 92 RSEI/NRMRL RSEI Nitrobenzene 92 RSEI/NRMRL RSEI Nitrofen 96 RSEI/NRMRL RSEI Nitrogen mustard 99 RSEI/NRMRL RSEI Nitroglycerin 75 RSEI/NRMRL RSEI N,N-Dimethylaniline 49 RSEI/NRMRL RSEI N,N-Dimethylformamide 85 NRMRL CWT Norflurazon 48 RSEI/NRMRL RSEI o-Anisidine 75 RSEI/NRMRL RSEI o-Anisidine hydrochloride 46 RSEI/NRMRL RSEI o-Cresol 53 NRMRL CWT o-Dinitrobenzene 46 RSEI/NRMRL RSEI o-Toluidine 93 Transfer from aniline; 50 POTW Study I&S

o-Toluidine hydrochloride 46 RSEI/NRMRL RSEI o-Xylene 77 50 POTW/NRMRL Average 3 MPM

Octachloronaphthalene 99 RSEI/NRMRL RSEI Octochlorostyrene RSEI/NRMRL RSEI Oryzalin 51 RSEI/NRMRL RSEI Osmium tetroxide 3 RSEI/NRMRL RSEI Oxadiazon 97 RSEI/NRMRL RSEI Oxydemeton methyl 75 RSEI/NRMRL RSEI Oxyfluorfen 97 RSEI/NRMRL RSEI Ozone 2 RSEI/NRMRL RSEI

### MEMORANDUM 12 August 2005 Page 16

Chemical POTW % Removal Primary Data Source 1,2 Secondary Data Source 1 p-Anisidine 92 RSEI/NRMRL RSEI p-Chloro-o-toluidine 48 RSEI/NRMRL RSEI p-Chloroaniline 46 RSEI/NRMRL RSEI p-Chlorophenyl isocyanate 99 RSEI/NRMRL RSEI p-Cresidine 46 RSEI/NRMRL RSEI p-Cresol 72 NRMRL CWT p-Dinitrobenzene 46 RSEI/NRMRL RSEI p-Nitroaniline 46 RSEI/NRMRL RSEI p-Nitrosodiphenylamine 58 RSEI/NRMRL RSEI p-Phenylenediamine 45 RSEI/NRMRL RSEI p-Xylene 96 RSEI/NRMRL RSEI Paraldehyde 45 RSEI/NRMRL RSEI Paraquat dichloride 45 RSEI/NRMRL RSEI Parathion 98 RSEI/NRMRL RSEI Pebulate 98 RSEI/NRMRL RSEI Pendimethalin 99 RSEI/NRMRL RSEI Pentachlorobenzene 84 RSEI/NRMRL RSEI Pentachloroethane 58 RSEI/NRMRL RSEI Pentachlorophenol 36 50 POTW - 2X ML CWT Pentobarbital sodium 47 RSEI/NRMRL RSEI Perchloromethyl mercaptan 88 RSEI/NRMRL RSEI Permethrin 99.9 RSEI/NRMRL RSEI Peroxyacetic acid 92 RSEI/NRMRL RSEI Phenanthrene 95 50 POTW - 10 × ML I&S Phenol 95 50 POTW - 10 X ML CWT Phenothrin 99.9 RSEI/NRMRL RSEI Phenytoin 49 RSEI/NRMRL RSEI Phosgene 100 RSEI/NRMRL RSEI Phosphine 2 RSEI/NRMRL RSEI Phosphorus (yellow or white) 69 NRMRL TEC Phthalic anhydride 99 RSEI/NRMRL RSEI Picloram 10 RSEI/NRMRL RSEI Picric acid 22 RSEI/NRMRL RSEI Piperonyl butoxide 97 RSEI/NRMRL RSEI Pirimiphos methyl 97 RSEI/NRMRL RSEI Polybrominated biphenyls (PBBs) 94 RSEI/NRMRL RSEI Polychlorinated alkanes RSEI/NRMRL RSEI Polychlorinated biphenyls (PCBs) 99 RSEI/NRMRL RSEI Polycyclic aromatic compounds 93 RSEI/NRMRL RSEI Potassium bromate 2 RSEI/NRMRL RSEI Potassium N-methyldithiocarbamate 76 RSEI/NRMRL RSEI Potassium dimethyldithiocarbamate 77 RSEI/NRMRL RSEI Profenofos 99 RSEI/NRMRL RSEI Prometryn 44 RSEI/NRMRL RSEI Pronamide 70 RSEI/NRMRL RSEI

### MEMORANDUM 12 August 2005 Page 17

Chemical POTW % Removal Primary Data Source 1,2 Secondary Data Source 1 Propachlor 76 RSEI/NRMRL RSEI Propane sultone 71 RSEI/NRMRL RSEI Propanil 56 RSEI/NRMRL RSEI Propargite 99.95 RSEI/NRMRL RSEI Propargyl alcohol 92 RSEI/NRMRL RSEI Propetamphos 78 RSEI/NRMRL RSEI Propiconazole 68 RSEI/NRMRL RSEI Propionaldehyde 92 RSEI/NRMRL RSEI Propoxur 92 RSEI/NRMRL RSEI Propylene oxide 92 RSEI/NRMRL RSEI Propylene (Propene) 99 RSEI/NRMRL RSEI Propyleneimine 75 RSEI/NRMRL RSEI Pyridine 95 NRMRL CWT Quinoline 76 RSEI/NRMRL RSEI Quinone 52 RSEI/NRMRL RSEI Quintozene 90 RSEI/NRMRL RSEI Quizalofop-ethyl 98 RSEI/NRMRL RSEI Resmethrin 99.99 RSEI/NRMRL RSEI Saccharin (manufacturing) 75 RSEI/NRMRL RSEI Safrole 67 RSEI/NRMRL RSEI sec-Butyl alcohol 92 RSEI/NRMRL RSEI Selenium compounds 34 NRMRL 5 CWT Selenium 34 NRMRL 5 CWT Sethoxydim 84 RSEI/NRMRL RSEI Silver 88 50 POTW - 10 X ML CWT Silver compounds 88 50 POTW - 10 X ML CWT Simazine 23 RSEI/NRMRL RSEI Sodium nitrite 1.85 RSEI/NRMRL RSEI Sodium dimethyldithiocarbamate 77 RSEI/NRMRL RSEI Sodium azide 2 RSEI/NRMRL RSEI Sodium o-phenylphenoxide 95 RSEI/NRMRL RSEI Sodium pentachlorophenate 96 RSEI/NRMRL RSEI Sodium dicamba 47 RSEI/NRMRL RSEI Sodium fluoroacetate 75 RSEI/NRMRL RSEI S,S,S-tributyltrithiophosphate 99.9 RSEI/NRMRL RSEI Strychnine and salts 2 RSEI/NRMRL RSEI Styrene oxide 75 RSEI/NRMRL RSEI Styrene 94 NRMRL CWT Sulfuric acid 100 RSEI/NRMRL RSEI Sulfuryl fluoride (Vikane) 2 RSEI/NRMRL RSEI Sulprofos 99.8 RSEI/NRMRL RSEI Tebuthiuron 23 RSEI/NRMRL RSEI Temephos 99.9 RSEI/NRMRL RSEI Terbacil 46 RSEI/NRMRL RSEI tert-Butyl alcohol 46 RSEI/NRMRL RSEI

### MEMORANDUM 12 August 2005 Page 18

Chemical POTW % Removal Primary Data Source 1,2 Secondary Data Source 1 Tetrabromobisphenol-A (TBBPA) RSEI/NRMRL RSEI Tetrachloroethylene (Perchloroethylene) 85 NRMRL CWT Tetrachlorvinphos 89 RSEI/NRMRL RSEI Tetracycline hydrochloride 45 RSEI/NRMRL RSEI Tetramethrin 99 RSEI/NRMRL RSEI Thallium 54 NRMRL CWT Thallium compounds 54 NRMRL CWT Thiabendazole 49 RSEI/NRMRL RSEI Thioacetamide 46 RSEI/NRMRL RSEI Thiobencarb 65 RSEI/NRMRL RSEI Thiodicarb 75 RSEI/NRMRL RSEI Thiophanate ethyl 87 RSEI/NRMRL RSEI Thiophanate-methyl 75 RSEI/NRMRL RSEI Thiosemicarbazide 45 RSEI/NRMRL RSEI Thiourea 75 RSEI/NRMRL RSEI Thiram 75 RSEI/NRMRL RSEI Thorium dioxide 3 RSEI/NRMRL RSEI Titanium tetrachloride 2 RSEI/NRMRL RSEI Toluene 96 NRMRL CWT Toluene-2,4-diisocyanate 99 RSEI/NRMRL RSEI Toluene-2,6-diisocyanate 99 RSEI/NRMRL RSEI Toluenediisocyanate 99 RSEI/NRMRL RSEI Toxaphene 99 RSEI/NRMRL RSEI trans-1,3-Dichloropropene 79 RSEI/NRMRL RSEI trans-1,4-Dichloro-2-butene 80 RSEI/NRMRL RSEI Triadimefon 52 RSEI/NRMRL RSEI Triallate 95 RSEI/NRMRL RSEI Triaziquone 45 RSEI/NRMRL RSEI Tribenuron methyl 78 RSEI/NRMRL RSEI Tributyltin fluoride 50 RSEI/NRMRL RSEI Tributyltin methacrylate 38 RSEI/NRMRL RSEI Trichlorfon 92 RSEI/NRMRL RSEI Trichloroacetyl chloride 99.9 RSEI/NRMRL RSEI Trichloroethylene 87 NRMRL CWT Triclopyr triethylammonium salt 75 RSEI/NRMRL RSEI Triethylamine 48 RSEI/NRMRL RSEI Trifluralin 97 RSEI/NRMRL RSEI Triforine 76 RSEI/NRMRL RSEI Triphenyltin chloride 39 RSEI/NRMRL RSEI Triphenyltin hydroxide 14 RSEI/NRMRL RSEI Tris(2,3-dibromopropyl)phosphate 99.5 RSEI/NRMRL RSEI Trypan blue 45 RSEI/NRMRL RSEI Urethane (Ethyl carbamate) 45 RSEI/NRMRL RSEI Vanadium 8 50 POTW -2 X ML CWT Vanadium compounds 8 50 POTW -2 X ML CWT

### MEMORANDUM 12 August 2005 Page 19

Chemical POTW % Removal Primary Data Source 1,2 Secondary Data Source 1 Vinclozolin 68 RSEI/NRMRL RSEI Vinyl bromide 95 RSEI/NRMRL RSEI Vinyl acetate 92 RSEI/NRMRL RSEI Vinyl chloride 92 RSEI/NRMRL RSEI Vinylidene chloride (1,1-dichloroethylene) 78 50 POTW/NRMRL Average 3 MPM

Warfarin and salts 3 RSEI/NRMRL RSEI Xylene (mixed isomers) 96 RSEI/NRMRL RSEI Zinc compounds 79 50 POTW - 10 X ML CWT Zinc (fume or dust) 79 50 POTW - 10 X ML CWT Zineb 98 RSEI/NRMRL RSEI Notes : 1 Primary data source for determination of POTW removal. EPA did not recalculate these POTW removal efficiencies. Secondary data source indicates where EPA located the actual value: either RSEI or the record supporting pretreatment standards for one of the following effluent guideline point source categories: • CWT – Central Waste Treaters Point Source Category • I&S – Iron and Steel Point Source Category • MPM – Metal Products and Machinery Point Source Category • TEC – Transportation Equipment Cleaning Point Source Category

2RSEI/NRMRL indicates the removal value came from RSEImodel. Based on information received from OPPT on the RSEI model, removal efficiencies in RSEI werederived from the National Risk Management Research Laboratory (NRMRL) Treatability Database, Version 5.

3 POTW removals for these chemicals were calculate d by averaging POTW and NRMRL data, depending on the waste stream. See Chapter 12, Table 12-1 of the Final Rule Development Document for Effluent Guidelines for Metal Products and Machinery (EPA-821-B-03-001).

4For dioxins and furans, the value for 1,2,3,6,7,8-HPCDF was the only dioxin or furan compound with POTW removal data in NRMRL; therefore its value was transferred to all dioxins and furans.

5 For the TEC rulemaking, this POTW removal value was transferred from the Pesticides Manual. 50 POTW - 10 X ML - Data are from 50 POTW Study, where influent concentrations are greater than 10 times the minimum level. 50 POTW - 2 X ML - Data are from 50 POTW Study, where influent concentrations are greater than 2 times the minimum level.