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Vincent Westphal - 3 - 28 April 2003 estimates of the useful life of the LTUs. The workplan shall also address impacts on groundwater quality that might result from the use of chemicals to replenish the buffering capacity of the soil and alternatives to the use of chemicals such as waste stabilization in a pond. By 18 September 2003, Bear Creek Winery shall submit a Buffering Capacity Report describing the findings of the investigation. • FCE states that the winery has initiated source control measures to reduce the concentration of Total Dissolved Solids (TDS) in the wastewater. By 14 July 2003,Bear Creek Winery shall submit a technical report describing the source control measures that have been implemented and analytical data demonstrating the effectiveness of the source control measures. The report shall also describe additional source control methods that could be implemented and the anticipated resulting reduction of TDS concentration. • By 18 September 2003, the Discharger shall submit a Groundwater Well Installation Report. The report shall be consistent with, and include the items listed, in the second section of Attachment A. • Bear Creek Winery informed staff that a potable water well will be drilled in June, 2003. Because the water quality from the well will influence the wastewater quality discharged at the site, supply water quality information is required. By 31 July 2003, Bear Creek Winery shall submit a Supply Water Quality Report that describes the quality of the water supplied by the new well. At a minimum, the characterization shall include TDS, electrical conductivity, and general minerals. • By 15 May 2004, the Discharger shall submit a Yadose Zone Monitoring Report. The report shall .discuss the effectiveness of the LTU in treating applied wastewater, identify constituents not adequately treated(if any), and alternatives that can be implemented to improve the LTU effectiveness. Samples shall be collected prior, during, and after crush over at least a seven-month period. In addition, Bear Creek Winery shall implement the revised MRP Order No. 71-37 beginning with the month of June 2003. Failure to submit the above reports, or submission of inadequate reports or late reports, may result in enforcement action including fines of up to $1,000 per day. If you have any questions,please contact Tim O'Brien at(916) 255-3116. " � ^tap-J \� �✓�G,rl THOMAS R. PINKOS Executive Officer Enc: Attachment A,Monitoring Well Installation and Reporting Guidance Revised MRP Order No. 71-37 cc: Mike Huggins, San Joaquin County Environmental Health Department, Stockton cc w/enc: Peter Haase, Fall Creek Engineering,Santa Cruz