SITE INFORMATION AND CORRESPONDENCE_1985-2004

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INFORMATION SHEET OROR NO. R5-2004-0028 • 7 CITY OF MANTECA, CITYOF LATHROP AND DUTRA FARMS WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUIN COUNTY b. The degradation after effective source control,treatment, and control is limited to waste constituents typically encountered in municipal wastewater as specified in the groundwater limitations in this Order; c. The Discharger minimizes the degradation by fully implementing, regularly maintaining, and optimally operating best practicable control technology(BPCT)measures; and d. The degradation does not result in water quality less than that prescribed in the Basin Plan, e.g., does not exceed water quality objectives. Monitoring of the groundwater must be conducted to determine if the discharge has caused an increase in constituent concentrations, when compared to background. The monitoring must, at a minimum, require a complete assessment of groundwater impacts including an assessment of all wastewater- related constituents which may have migrated to groundwater,the vertical and lateral extent of any degradation, and an analysis of whether additional or different methods of treatment or control of the discharge are necessary to provide best practicable treatment or control to comply with Resolution 68- 16. Economic analysis is only one of many factors considered in determining best practicable treatment. If monitoring indicates that the discharge has incrementally increased constituent concentrations in groundwater above background,this permit may be reopened and modified. Until groundwater monitoring is sufficient, this Order contains Groundwater Limitations that allow groundwater quality to be degraded for certain constituents when compared to background groundwater quality,but not to exceed water quality objectives or standards. If groundwater quality is shown to have been degraded by the wastewater treatment processes or the discharge, the incremental change in pollutant concentration (when compared with background) may not be increased. This Order may also be reopened and specific numeric limitations established. The discharge authorized herein and the treatment and storage facilities associated with the discharge of treated municipal wastewater, except for discharges of residual sludge and solid waste, are exempt from the requirements of Title 27, CCR, Section 20005 et seq. (hereafter Title 27). The exemption, pursuant to Title 27, CCR, Section 20090(a), is based on the following: a. The waste consists primarily of domestic sewage and treated effluent; b. The waste discharge requirements are consistent with water quality objectives; and c. The treatment and storage facilities described herein are associated with a municipal wastewater treatment plant. This Order requires the Discharger to prepare technical and monitoring reports as authorized by California Water Code (CWC) Section 13267. This Order also requires that the Discharger conduct groundwater monitoring and includes a regular schedule of groundwater monitoring in the attached Monitoring and Reporting Program. The groundwater monitoring reports are necessary to evaluate impacts to waters of the State to assure protection of beneficial uses and compliance with Regional Board plans and policies, including Resolution 68-16, and to assure compliance with this Order.