SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING PROGRAM NO. 92- 034 FOR USC/A DIVISION OF HYDRITE CHEMICAL COMPANY CLASS II SURFACE IMPOUNDMENT SAN JOAQUIN COUNTY Existing monitoring wells show that discharge from the surface impoundment at the USC/A Division of Hydrite Chemical Company facility has affected ground water quality. This is a Corrective Action monitoring program, the purpose of which is to determine whether measures taken by USC/A Division of Hydrite Chemical Company (hereafter Discharger) are sufficient to remediate the releases of waste discharges to ground water and to determine if the continued discharge of waste to land is in compliance with the California Code of Regulations, Title 23, Division 3, Chapter 15 (Chapter 15). REPORTING In reporting the monitoring data required by this program, the Discharger shall arrange the data in tabular form so that the date, the constituents, the concentrations, and the units are readily discernible. The data shall be summarized in such a manner so as to illustrate clearly the compliance with waste discharge requirements or the lack thereof. A short discussion of the monitoring results, including notations of any water quality violations shall precede the tabular summaries. Quarterly monitoring reports shall be submitted to the Board by the 15th day of the month following the calendar quarter in which the samples were taken. The results of any monitoring done more frequently than required at the locations specified herein shall be reported to the Board. A semi-annual report shall be submitted to the Board which contains both tabular and graphical summaries of the monitoring data obtained during the previous six months. The report shall include a discussion of the progress toward reestablishment of compliance with waste discharge requirements and water quality protection standards. The Discharger shall use the statistical procedures in Article 5 of Chapter 15 to differentiate between background monitoring data and that which indicates a release has occurred from the surface impoundment. For those substances which have no natural background, such as volatile organics, statistical procedures are not appropriate, except where an upgradient contaminant source causes the surface impoundment's background monitoring points to produce data in quantifiable concentrations at least 10% of the time. The analytical laboratory shall differentiate between detection and quantitation of constituents. The reported practical quantitation limit (PQL) shall be lower than the maximum contaminant levels (MCLS) . In addition, the analytical reports should differentiate between non-detect and trace results.