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WASTE DISCHARGE REQUIREMENTS ORDER R5-2012-0105 10 <br /> DIAMOND PET FOOD PROCESSORS OF RIPON, LLC AND <br /> RIPON COGENERATION, LLC <br /> DIAMOND PET FOOD RIPON FACILITY <br /> SAN JOAQUIN COUNTY <br /> 44. The Basin Plan designates the beneficial uses of underlying groundwater as municipal <br /> and domestic supply, agricultural supply, industrial service supply, and industrial process <br /> supply. <br /> 45. The Basin Plan establishes narrative water quality objectives for chemical constituents, <br /> tastes and odors, and toxicity in groundwater. It also sets forth a numeric objective for <br /> total coliform organisms. <br /> 46. The Basin Plan's narrative water quality objectives for chemical constituents, at a <br /> minimum, requires waters designated as domestic or municipal supply to meet the MCLs <br /> specified in Title 22 of the California Code of Regulations (hereafter"Title 22"). The Basin <br /> Plan recognizes that the Central Valley Water Board may apply limits more stringent than <br /> MCLs to ensure that waters do not contain chemical constituents in concentrations that <br /> adversely affect beneficial uses. <br /> 47. In summary, the narrative toxicity objective requires that groundwater be maintained free <br /> of toxic substances in concentrations that produce detrimental physiological responses in <br /> human, animal, plant, or aquatic life associated with designated beneficial uses. <br /> Quantifying a narrative water quality objective requires a site-specific evaluation of those <br /> constituents that have the potential to impact water quality and beneficial uses. <br /> Antidegradation Analysis <br /> 48. State Water Resources Control Board Resolution 68-16 ("Policy with Respect to <br /> Maintaining High Quality Waters of the State") (hereafter "Resolution 68-16") prohibits <br /> degradation of groundwater unless it has been shown that: <br /> a. The degradation is consistent with the maximum benefit to the people of the State. <br /> b. The degradation will not unreasonably affect present and anticipated future beneficial <br /> uses. <br /> c. The degradation does not result in water quality less than that prescribed in state and <br /> regional policies, including violation of one or more water quality objectives, and <br /> d. The Dischargers employ best practicable treatment or control (BPTC) to minimize <br /> degradation. <br /> 49. Constituents of concern that have the potential to degrade groundwater include salts <br /> (primarily TDS, sodium, and chloride), and nutrients, as discussed below: <br /> a. Some degradation occurred as a result of the former paper mill/cogeneration plant <br /> discharge. The Secondary MCL for TDS is 500 mg/L as a recommended level, <br /> 1000 mg/L as an upper level, and 1500 mg/L as a short-term maximum. Based on the <br /> groundwater monitoring data, the current (pre-Diamond) groundwater TDS <br /> concentrations exceed the recommended Secondary MCL of 500 mg/L. <br /> The projected TDS concentration of 684 mg/L for the untreated wastewater is less <br /> than the former paper mill/cogeneration plant discharge and is less than the TDS <br /> concentrations in the onsite compliance monitoring wells. The predicted TDS loading <br /> rate is approximately 61 percent of the former discharge. Therefore, the proposed <br /> discharge is not likely to degrade groundwater quality any further for TDS. This Order <br />