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ORDER NO. 5-00-119 -5- INFORMATION SHEET GENERAL ORDER FOR DISCHARGE TO SURFACE WATERS OF GROUND WATER FROM CLEANUP OF PETROLEUM FUEL POLLUTION ATTACHMENT C Several of the recommended limits are based on taste and odor that these chemicals can impose as an adverse impact to the.water quality beneficial use. For these chemicals, an impact on the palatability of the water occurs at lower concentrations than those.that could cause health effects. Taste and odor related'criteria are applicable, since both health effects and palatability are relevant to the assessment of beneficial use protection. Also, some of the recommended limits are lower than applicable analytical detection limits in water. In these cases, the detection of any amount of . these constituents in water indicates that beneficial uses have been impaired. In establishing the general limitations in this permit additional consideration was given to the following policies regarding the assessment of existing and potential water quality impacts: State Board Resolution Nos. 68-16, Statement of Policy With Respect to Maintaining High Quality of Water in California, and 92-049,Policies and Procedures for Investigation of Cleanup and Abatement of Discharges Under Water Code Section 13304. Requiring cleanup to technologically and economically achievable levels which are lower than beneficial use-protective limits, would be consistent with these policies for highest degree of protection of the$tate's water resources; USEPA adopted the National Toxics Rule on 5 February 1993 and the California Toxics Rule on 18 May 2000. These Rules contain water quality standards applicable to this discharge. The State Water Resources Control Board adopted the Policy for Implementation of Toxics Standards for Inland Surface Waters, Enclosed Bays, and Estuaries of California (known as the State Implementation Plan),which contains guidance on implementation of the National Toxics Rule and the California Toxics Rule. Evaluation of the proposed effluent.limitations contained in this permit with the California Toxics Rule(CTR)resulted in the constituent lead as having more restricted effiuent criteria than previously drafted in tentative WDRs. EPA did not promulgate human health criteria for lead,but recommended State's use their existing narrative toxicity criteria. The freshwater chronic criteria may vary based on the water effects ratio (WER) and will varybased onwaterhardness. Conservatively, for the purposes of this general permit,the WER.and the conversion factor of dissolved to total lead are both assumed to be equal to 1. The public health protection standard is not established in the CTR but using the Califoraia.public health protection standard the effluent limitation would be 2 ug/l (based on Office of Environmental Health Hazard Assessment, OEHHA). However, for water hardnesses below 80 mg/1 the CTR standard is more restrictive than the State drinldng water standard of 2 ug/l. Therefore, an effluent limitation is established at 2 ug/1•unless the discharged water hardness is less than 80 mg/l whereas the effluent limitation is established in accordance with the following formula: 1.46203—[(In {hardness})(0.145712)] to protect freshwater aquatic life.. In establishing effluent limitations for the protection of the receiving waters the following water quality criteria were considered: