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1_ <br /> August 11,2000 -9- <br /> 003-7170 <br /> statistical data evaluation is unnecessary, and the concentration limits proposed for the synthetic <br /> organic compounds are their respective analytical detection limits. <br /> The concentration limits for inorganic constituents (general water-quality parameters) will be <br /> calculated tolerance limits. <br /> Appropriately, the tolerance interval method is proposed to be used in evaluating inorganic water- <br /> quality monitoring data for the site. This method is one of the four methods of statistical analysis <br /> recommended in Title 27, Article 1, Sections 20380 through 20435 (Title 27), and it will be used in <br /> ` determining statistically significant evidence of a release from a source. <br /> The tolerance interval method is used to estimate the highest value (and the lowest value in the case of <br /> L pH and nitrate-nitrogen) of each monitoring parameter that a monitoring point can exhibit and still be <br /> reasonably attributed to natural variability. A tolerance interval establishes a concentration range that <br /> contains a specified proportion, or coverage, of the population with a specified confidence limit. The <br /> coverage and confidence limits to be used for the site monitoring program are 95 percent and 95 <br /> percent,respectively, as required by Title 27. <br /> 4.4 Reporting <br /> The water quality monitoring data will be reported on a quarterly basis to the RWQCB. The <br /> ` monitoring reports will be submitted on the 301h day of the month following each quarter of the year. <br /> Quarterly reports will include tabular summaries of the monitoring data, determination of ground <br /> water flow direction and gradient, a ground water contour map, and a statistical analysis of the <br /> monitoring data. Graphical summaries of the analytical data will be prepared on an annual basis. <br /> 5.0 SCHEDULE <br /> Field activities will be initiated following receipt of approval of the work plan by the RW <br /> activities are anticipated to be completed over a four week period includinglaboratory <br /> c Field <br /> ory chemical <br /> analysis. Field activities are planned to be initiated on September 5, 2000. Assuming approval of the <br /> L workplan is received by August 30, 2000, a well completion report can be submitted to the CRWQCB <br /> by October 30, 2000. <br /> 6.0 REFERENCES <br /> California Regional Water Quality Control Board, Central Valley Region, 2000. Order No. 5-00-056, <br /> Waste Discharge Requirements Foi Owens-Brockway Owens-Illinois Glass Furnace Facility, San <br /> ` Joaquin County. <br /> Golder Associates Inc., 1998. May 1998 Ground Water Monitoring Report, Owens-Brockway Glass <br /> Containers,Tracy, California. <br /> Golder Associates Inc., 1999. September 1999 Ground Water Monitoring Report, Owens-Brockway <br /> Glass Containers, Tracy, California. <br /> Golder Associates Inc. (2000), "Process Wastewater Pond Evaluation and Water Balance, Owens- <br /> Brockway Glass Container Facility,Tracy,California,"August 11, 2000. <br /> Ir ft00'37dm Golder Associates <br />