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SPX CORPORATION ORDER R5-2019-0018 SPX MARLEY COOLING TECHNOLOGIES GROUNDWATER CLEANUP NPDES NO. CA0081787 3. Best Management Practices and Pollution Prevention a. Salinity Evaluation and Minimization Plan. An Evaluation and Minimization Plan for salinity is required to be maintained in this Order to ensure adequate measures are developed and implemented by the Discharger to reduce the discharge of salinity to the Stockton Diverting Canal. 4. Construction, Operation, and Maintenance Specifications — Not Applicable 5. Other Special Provisions a. Release Prevention/Contingency Measures Plan. To control accidental discharges and minimize the effects of such events, the Discharger is required to update and continue implementation of release prevention and contingency measures. These plans shall include proposed modifications to the treatment system and describe implementation of additional monitoring and inspections in the event of an accidental discharge or spill. VII. RATIONALE FOR MONITORING AND REPORTING REQUIREMENTS CWA section 308 and 40 C.F.R. sections 122.41(h), (j)-(I), 122.44(1), and 122.48 require that all NPDES permits specify monitoring and reporting requirements. Water Code sections 13267 and 13383 also authorize the Central Valley Water Board to establish monitoring, inspection, entry, reporting, and recordkeeping requirements. The Monitoring and Reporting Program (MRP), Attachment E of this Order establishes monitoring, reporting, and recordkeeping requirements that implement federal and state requirements. The following provides the rationale for the monitoring and reporting requirements contained in the MRP for this facility. A. Influent Monitoring 1. Influent monitoring is required to collect data on the characteristics of the wastewater and to assess compliance with effluent limitations (e.g., BOD5 and TSS reduction requirements). The monitoring frequencies for total suspended solids, total chromium, copper, and arsenic (1/Quarter) have been retained from Order No. R5-2014-0013. B. Effluent Monitoring 1. Pursuant to the requirements of 40 C.F.R. section 122.44(1)(2) effluent monitoring is required for all constituents with effluent limitations. Effluent monitoring is necessary to assess compliance with effluent limitations, assess the effectiveness of the treatment process, and to assess the impacts of the discharge on the receiving stream and groundwater. 2. Effluent monitoring frequencies and sample types for flow, pH, total suspended solids, total recoverable copper, dissolved chromium (VI), dissolved oxygen, electrical conductivity, hardness, temperature, turbidity, and total dissolved solids (1/month) and arsenic and iron (1/quarter) have been retained from Order R5-2014-0013 to determine compliance with effluent limitations for these parameters. 3. Monitoring data collected over the previous permit term for total chromium did not demonstrate reasonable potential to exceed water quality objectives/criteria. Thus, specific monitoring requirements for these parameters have not been retained from Order No. R5-2014-0013. 4. Water Code section 13176, subdivision (a), states: "The analysis of any material required by[Water Code sections 13000-16104]shall be performed by a laboratory that has accreditation or certification pursuant to Article 3 (commencing with Section 100825) of ATTACHMENT F- FACT SHEET F-38