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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2003-0099 11 NEWPORT PACIFIC CAPITAL COMPANY,INC. ARBOR MOBILE HOME PARK WASTEWATER TREATMENT FACILITY SAN JOAQUIN COUNTY 4. Steps to be taken when an overflow or spill occurs, and procedures that will be implemented to ensure that all overflows and spills are properly identified, responded to and reported to appropriate agencies, and if necessary, the public. GROUNDWATER EVALUATION C. By 4 September 2003, the Discharger shall submit a workplan for the characterization of groundwater quality at the disposal area. The workplan shall describe the installation of at least three groundwater monitoring wells to allow evaluation of the groundwater quality to adequately characterize background water quality and potential groundwater impacts from the wastewater discharge. Every monitoring well shall be constructed to yield representative samples from the uppermost layer of the uppermost water bearing zone and to comply with applicable well standards. The workplan shall be consistent with, and include the items listed in, the first section of Attachment C, "Items to be Included in a Monitoring Well Installation Workplan and a Monitoring Well Installation Report of Results. " d. By 28 February 2004, the Discharger shall submit a groundwater well installation report. The report shall be consistent with, and include the items listed in, the second section of Attachment C. e. By 30 June 2005, the Discharger shall submit a Groundwater Quality Study Report. For each groundwater monitoring parameter/constituent identified in the Monitoring and Reporting Program, the report shall present a summary of monitoring data from each monitoring well. Determination of groundwater quality shall be made using the methods described in Title 27, Section 20415(e)(10), and data from at least four consecutive quarterly(or more frequent) groundwater monitoring events. f. If the Groundwater Quality Study Report shows that groundwater exceeds Groundwater Limitations,then within 120 days of the Executive Officer's request the Discharger shall submit a technical report in the form of a Wastewater System Evaluation Report and Implementation Workplan. The technical report shall include a comprehensive evaluation of treatment and control measures that address full mitigation of the source of the exceedance(s). The report shall describe treatment and control alternatives studied, the alternative(s)recommended for implementation, and any specific methods the Discharger proposes to monitor and assure continuous optimal performance, the source of funding, and proposed schedule for implementation. The recommended improvements and implementation schedule are subject to the Executive Officer's approval,but the schedule for full implementation shall be as short as practicable and not exceed two years unless specifically approved by the Regional Board. 2. In accordance with California Business and Professions Code sections 6735, 7835, and 7835.1, engineering and geologic evaluations and judgments shall be performed by or under the direction of registered professionals competent and proficient in the fields pertinent to the required activities. All technical reports specified herein that contain workplans for, that describe the conduct of investigations and studies, or that contain technical conclusions and