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D R A F T January 4, 2012 wastewater mixture applied to the fields and discharged to the ponds includes, at various times, secondary effluent, untreated industrial wastewater, a biosolids slurry, stormwater and runoff, and biosolids supernatant. CALSPA correctly asserts that the sewage exemption in Title 27 does not include residual sludges. However, residual sludges may be discharged in compliance with Title 27 if the sludges are discharged in accordance with any other applicable exemption under section 20090, such as the wastewater exemption. The City contends that the discharge of both the biosolids slurry and supernatant is exempt from Title 27 as a soil amendment under section 20090(f). The Board concludes, however, that the wastewater exemption is more appropriate than the soil amendment exemption. The biosolids slurry and supernatant are applied to land as part of a wastewater mixture, as noted previously. In addition, the soil amendment exemption applies to decomposable wastes26 and the wastewater mixture applied to land includes waste components that are likely not decomposable, such as metal finishing wastes and a considerable amount of non-nutritive salts. Based on the foregoing discussion, the Board concludes that it is the wastewater, rather than the sewage, exemption that could apply to the discharge. The Board will, therefore, consider whether the findings in Order No. R5-2007-0113 and the evidence in the record support the conclusion that the City's land disposal activities meet the preconditions for the wastewater exemption. The Central Valley Water Board has issued waste discharge requirements for the City's land disposal activities and the discharges do not appear to be hazardous. Consequently, the Board will focus its analysis on whether the findings and the evidence indicate that the City's land disposal activities comply with the remaining precondition under section 20090(b) that "the discharge is in compliance with the [Basin Plan]." The City bears the burden of proof on this issue. The City must demonstrate, with appropriate data, that its land disposal activities comply with the Basin Plan. 2. Findings The Central Valley Water Board concluded that the City's land disposal activities were exempt under the sewage exemption in Title 27, but did not explicitly find that the City's discharge currently complies with the Basin Plan. Instead, the record reflects that the Central Valley Water Board stated that additional information on groundwater quality and discharge portion of the publicly owned treatment works that is designed to provide treatment of municipal and industrial waste. (Id. §403.3(r).) 25 "Decomposable wastes"are wastes"which, under suitable natural conditions, can be transformed through biological and chemical processes into compounds that do not impair the quality of waters of the state." (Cal. Code Regs.,tit.27, §20164.) 10.