SITE INFORMATION AND CORRESPONDENCE

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MONITORING AND REPORTI*ROGRAM NO. R5-2007-XXXX -4 - PIONEER 4 - PIONEER AMERICAS LLC TRACY, SAN JOAQUIN COUNTY REPORTING Groundwater monitoring and sampling data shall be submitted to the California State Water Resources Control Board's GeoTracker database system and written reports shall be submitted to the Regional Water Board. 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. In addition, the Discharger shall notify the Regional Water Board verbally within 48 hours of any unscheduled shutdown of any wellhead treatment system(s). 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 semi-annual electronic data reports, which conform to the requirements of the California Code of Regulations, Title 23, Division 3, Chapter 30. The semi-annual reports shall be submitted electronically over the Internet to the GeoTracker database system by 1 February and 1 August of each year until such time as the Executive of i Icer deter i i lines that the reports are no longer necessary. In the event that any wellhead treatment system(s) is installed, the Discharger shall submit a monthlr wellhead treatment system monitoring data report to the Regional Water Board by the 281 day of the following month until such time as the Executive Officer determines that the report is no longer necessary. Each monthly report shall include the following minimum information: (a) A table or tables of the wellhead treatment system(s) influent, midstream, and effluent water sample laboratory chemical analyses data collected during the month; (b) Status of the wellhead treatment system(s), including operating time, effectiveness, and any field notes pertaining to the operation and maintenance of the system(s); (c) The reasons for, and duration of all interruptions in the operation of the wellhead treatment system(s) and actions planned or taken to correct and prevent future interruptions; and (d) Copies of the laboratory chemical analyses reports from all systems during the month. The Discharger shall submit a Semi-Annual report to the Regional Water Board by 1 August of each year until such time as the Executive Officer determines that the report is no longer necessary. Each semi-annual report shall include the following minimum information from the first and second quarter monitoring and sampling events: (a) A description of the first and second quarter groundwater monitoring and sampling events; (b) A table or tables of the piezometric surface measurements and laboratory chemical analyses results for the first and second quarter monitoring and sampling events;