Notes on Standard Method B and Standard Method C
                    Formula Values	

                
                    Quick Links:

                    ● Potable Ground WaterSurface WaterAirSoil

                    
                        
                            Potable Ground Water
                        

                        Ground water concentrations that are protective of human health under standard
                        Method B and standard Method C using the equations and default values provided
                        in the regulation are accessible in the CLARC Information System using the CLARC
                        Database Search tool. See WAC 173-340-720(4)(b)(iii) and 173-340-720(5)(b)(iii).
                        The following equations were used:

                        ● Equation 720-1 (non-carcinogens)
                        ● Equation 720-2 (carcinogens)

                        The pre-calculated values are NOT cleanup levels. The values DO NOT account
                        for the following:

                        ● Consideration of applicable state and federal laws;
                        ● Consideration of surface water impacts;
                        ● Consideration of total site risk;
                        ● Consideration of the NAPL limitation;
                        ● Consideration of natural background concentrations; and
                        ● Consideration of practical quantitation limits.

                        
                            
                                Surface Water
                            

                            Surface water concentrations that are protective of human health under standard
                            Method B and standard Method C using the equations and default values provided
                            in the regulation are accessible in the CLARC Information System using the CLARC
                            Database Search tool. See WAC 173-340-730(3)(b)(iii) and 173-340-730(4)(b)(iii).
                            The following equations were used:

                            ● Equation 730-1 (non-carcinogens)
                            ● Equation 730-2 (carcinogens)

                            The pre-calculated values are NOT cleanup levels. The values DO NOT account for
                            the following:

                            ● Consideration of applicable state and federal laws;
                            ● Consideration of ecological impacts;
                            ● Consideration of total site risk;
                            ● Consideration of the NAPL limitation;
                            ● Consideration of natural background concentrations; and
                            ● Consideration of practical quantitation limits.

                            
                                
                                    Air
                                

                                Air concentrations that are protective of human health under standard Method B
                                and standard Method C using the equations and default values provided in the regu-
                                lation are accessible in the CLARC Information System using the CLARC Database
                                Search tool. See WAC 173-340-750(3)(b)(ii) and 173-340-750(4)(b)(ii). The
                                following equations were used:

                                ● Equation 750-1 (non-carcinogens)
                                ● Equation 750-2 (carcinogens)

                                The pre-calculated values are NOT cleanup levels. The values DO NOT account
                                for the following:

                                ● Consideration of applicable state and federal laws;
                                ● Consideration of the lower explosive limit limitation;
                                ● Consideration of total site risk;
                                ● Consideration of natural background concentrations; and
                                ● Consideration of practical quantitation limits.

                                
                                    
                                        Soil
                                    

                                    Soil concentrations that are protective of human health under standard Method B
                                    (unrestricted land use) and standard Method C (industrial land use) for both the direct contact pathway (ingestion only) and the leaching pathway (protection of
                                    ground water) are accessible in the CLARC Information System using the CLARC
                                    Database Search tool. Protective concentrations based on the direct contact
                                        pathway (ingestion only) were calculated using the equations and default values
                                    provided in the regulation. See WAC 173-340-740(3)(b)(iii)(B) and 173-340-
                                    745(5)(b)(iii)(B). The following equations were used:

                                    ● Equation 740-1 (Method B: non-carcinogens)
                                    ● Equation 740-2 (Method B: carcinogens)
                                    ● Equation 745-1 (Method C: non-carcinogens)
                                    ● Equation 745-2 (Method C: carcinogens)

                                    Protective concentrations based on the leaching pathway were not precalculated.
                                    To calculate the soil concentration that is protective of ground water, use the “Work-
                                    books and User’s Guide for Calculating Cleanup Levels” and download spreadsheet
                                    tool (MTCASGL10.XLS), located at

                                    http://www.ecy.wa.gov/programs/tcp/tools/toolmain.html

                                    The pre-calculated soil concentrations are NOT cleanup levels. The values DO NOT
                                    account for the following:

                                    ● Consideration of applicable state and federal laws;
                                    ● Consideration of ecological impacts;
                                    ● Consideration of dermal contact as part of the direct contact pathway;
                                    ● Consideration of residual saturation for protection of ground water;
                                    ● Consideration of the vapor pathway;
                                    ● Consideration of total site risk;
                                    ● Consideration of natural background concentrations; and
                                    ● Consideration of practical quantitation limits. NOTE: The CLARC Information System does not provide pre-calculated values for
                                    petroleum mixtures for any media. Access the guidance portal for cleanup levels for
                                    petroleum mixtures tab for more information.