SITE INFORMATION AND CORRESPONDENCE

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• • INFORMATION SHEET, ORDER NO. 5-01-251 -6- CITY-OF LATHROP AND CROSSROADS CREA LLC WASTEWATER TREATMENT FACILITY NO. 1 (CROSSROADS) SAN JOAQUIN COUNTY Title 27 Title 27,CCR, section 20380 et seq. ("Title 27"), contains regulations to address certain discharges to land. Title 27 establishes a waste classification system, specifies siting and construction standards for full containment of classified waste, requires extensive monitoring of groundwater and the unsaturated zone for any indication of failure of containment, and specifies closure and post-closure maintenance requirements. Generally, no degradation of groundwater quality by any waste constituent is acceptable. Discharges of domestic sewage and treated effluent can be treated and controlled to a degree that will not result in unreasonable degradation of groundwater. For this reason, they have been conditionally exempted from Title 27, except for residual sludge and solid waste generated as part of the treatment process [section 20090(a) of Title 27]. The condition requires that the discharge not result in violation of any water quality objective in groundwater. Treatment and storage facilities for sludge that are part of the W WTF are considered exempt from Title 27 under section 20090(a),under the condition that the facilities not result in a violation of any water quality objective. However,residual sludge (for the purposes of the proposed order, sludge that will not be subjected to further treatment by the WWTF)is not exempt from Title 27. Solid waste(e.g., grit and screenings)that results from treatment of domestic sewage and industrial waste also is not exempt from Title 27. This residual sludge and solid waste are subject to the provisions of Title 27. Accordingly, the municipal discharge of effluent and the operation of treatment or storage facilities associated with a municipal wastewater treatment plant can be allowed without requiring compliance with Title 27,but only if resulting degradation of groundwater is in accordance with the Basin Plan. This means, among other things, degradation of groundwater must be consistent with Resolution 68-16 and in no case greater than water quality objectives. The conditions for sludge, solid waste, and biosolids management proposed in this Order are intended to assure this and must all be evaluated along with other aspects of BPTC. Proposed Order Terms and Conditions Discharge Prohibitions and Specifications The proposed Order establishes a discharge flow limit of 250,000 gpd. The proposed Order's discharge specifications for BODS and TSS are based on the treatment technologies employed. The proposed Order does not require the Discharger to disinfect effluent at this time. The discharge specifications regarding dissolved oxygen and freeboard are consistent with Board policy for the prevention of nuisance conditions, and are applied to all such facilities. In order to protect public health and safety, the proposed Order requires the Discharger to comply with many of the provisions of Title 22 and to implement best management practices with respect to effluent disposal (e.g.,to dispose of effluent at reasonable rates considering the crop, soil, climate, and irrigation management plan.).