SITE INFORMATION AND CORRESPONDENCE

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MONITORING AND REPORTING PROGRAM ORDER NO, R5-2008-0149-027 OXYCHEM STOCKTON, 1904 CHARTER WAY, SAN JOAQUIN COUNTY 4 AMENDMENT ANALYSIS An amendment analysis has been satisfactorily performed and delivered to Regional Water Quality Control Board staff. The contents of the analysis are proprietary. ESTABLISHMENT OF BACKGROUND CONCENTRATION VALUES The Discharger shall develop background values for concentrations of dissolved iron, dissolved manganese, total dissolved solids and electrical conductivity in groundwater following the procedures found in CCR Section 20415(e) (10). The Discharger shall submit a proposal to develop the background concentrations by 1 June 2011. REPORTING When reporting the data, the Discharger shall arrange the information in tabular form so that the date, the constituents, and the concentrations are readily discernible. The data shall be summarized in such a manner as to illustrate clearly the compliance with this Order. The results of any monitoring done more frequently than required at the locations specified in the Monitoring and Reporting Program shall also be reported to the Central Valley Water Board. As required by the California Business and Professions Code Sections 6735, 7835, and 7835.1, all reports shall be prepared by a registered professional or their subordinate and signed by the registered professional. The Discharger shall submit quarterly or semi-annual electronic data reports, as specified in Table 1, which conform to the requirements of the California Code of Regulations, Title 23, Division 3, Chapter 30. The quarterly and semi-annual reports shall be submitted electronically over the internet to the Geotracker database system by the 1 st day of the second month following the end the calendar quarter in which samples were collected (1 May and 1 November) until such time as the Executive Officer determines that the reports are no longer necessary. In addition, hard copies of semi-annual reports shall be submitted to the Central Valley Board by 1 May and 1 November. These remediation monitoring reports may be combined with groundwater monitoring reports as may be required by a separate monitoring and reporting program for this site. Each semi-annual report shall include the following minimum information: (a) a description and discussion of the groundwater sampling event and results, including trends in the concentrations of pollutants and groundwater elevations in the wells, how and when samples were collected, and whether the pollutant plume(s) is delineated; (b) field logs that contain, at a minimum, water quality parameters measured before, during, and after purging, method of purging, depth of water, volume of water purged, etc.;