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>Supplemental Information <br /> Report Of Waste Discharge <br /> 8200 N. Highway 99,Stockton, CA <br /> Page 4 of 6 <br /> conductivity of the water stabilized, as measured by portable meters calibrated to a standard buffer and <br /> conductivity standard. The water level will be allowed to recover to at least 80 percent of the initial <br /> water level prior to sampling. Purged groundwater will be contained in DOT-approved, polyethylene, <br /> 55-gallon drums pending disposal. <br /> A sample of the formation water will then be collected from the surface of the water in each of the <br /> wells with a dedicated disposable bailer and slowly transferred using a bottom-emptying device to <br /> laboratory-cleaned sample containers. <br /> Equipment Calibration <br /> • Water Level Measurements in Wells: (1) Steel surveyors tape. Calibration: <br /> manufacturer supplied temperature correction will be applied as applicable for field <br /> conditions. (2) Electronic well sounders. Calibration: Once by manufacturer, then <br /> periodic check against steel surveyor's tape. <br /> • Organic Vapors-Photoionization detector. Calibration: Daily logged field calibration <br /> using isobutylene standard per manufacturer instructions. <br /> • Groundwater pH Measurements-Digital pH meter. Calibration: standard pH solutions <br /> of 4, 7, and 10 utilized for daily logged field calibration and/or according to <br /> manufacturer instructions. <br /> • Electrical Conductivity-Electrical conductivity meter. Calibration: factory-calibrated <br /> initially and periodically calibrated against laboratory prepared standard calibration <br /> solution. <br /> • Water Temperature-Mercury or digital thermometers. Calibration: one-time factory- <br /> calibrated. <br /> Laboratory Analysis <br /> Groundwater samples will be analyzed by a State-certified laboratory for TPHg by EPA method <br /> 801513, BTEX by EPA method 8021B, and for oxygenated gasoline additives, including MTBE, <br /> EDB, and 1,2-DCA, by EPA method 8260B. <br /> Laboratory Quality Assurance/Quality ontrol <br /> Samples will be submitted to a State-certified laboratory for chemical analysis. Established QA/QC <br /> procedures for analytical operations include sample custody procedures, standards of analytical <br /> accuracy, analysis of matrix spikes and method data, and maintenance of control charts to monitor <br /> analytical performance. Organic chemical analyses will be performed in conformance with standard <br /> procedures established by the United States Environmental Protection Agency (EPA) in "Guidelines <br /> Establishing Test Procedures for the Analysis of Pollutants Under the Clean Water Act" (40 CFR Part <br /> GIGROUNDMTULEBIJRGIReportslworkpIan\W DRSupplemental,doe <br />