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f <br /> Ben Hall -3- 18 April 2011 <br /> Musco Family Olive Company <br /> higher concentration water of one end member is mixing with the lesser concentration end <br /> member. Chart 7 and Chart 8 of the report indicate that sodium and chloride concentrations in <br /> well MW-12 were increasing in concentration, similar to well MW-22. Both these wells are in <br /> close proximity of the Ponds. <br /> The question that remains and requires an interpretation is: what is causing the increases of <br /> sodium and chloride in the groundwater in the vicinity of wells MW-12 and MW-22? The <br /> source of the water affecting these wells is not identified in the report. Musco should explore <br /> these questions and put forth a reasonable explanation for these increases in groundwater. <br /> By 1 June 2011 Musco shall submit a leak detection and LCRS test work plan for the Class II <br /> Surface Impoundments. The work plan shall provide a minimum of two testing methods for <br /> both the leak detection and LCRS tests to be conducted, a comparison and cost analysis of <br /> the testing methods, and a schedule of the chosen testing method to be performed during <br /> 2011. Results of the leak detection and LCRS shall be submitted in second <br /> semi-annual/annual 2011 monitoring report. <br /> The next semi-annual monitoring report is due 31 July 2011. The report shall provide an <br /> evaluation of the increases in sodium and chloride observed in wells MW-12 and MW-22 <br /> compared to wells MW-1 OR and the newly installed DMP wells. <br /> By 31 January 2012, Musco shall submit the second semi-annual/annual monitoring report <br /> incorporating all monitoring data for the 2011 monitoring year, including the results of the liner <br /> leak test and LCRS test. <br /> Please call me at 916-464-4737 if you have any questions or would like to meet to discuss the <br /> work that we are requesting. We are open to alternative plans and schedules within the <br /> constraints of the applicable regulations. <br /> 7E <br /> TODD A. DEL FRATE, P.G. <br /> Engineering Geologist <br /> Compliance and Enforcement Unit <br /> Enclosure Monitoring and Reporting Checklist <br /> cc: Donna Heran, San Joaquin County Environmental Health Department, Stockton <br /> Michael Campos, Stoel Rives, Sacramento <br /> Gary Carlton, Kennedy/Jenks, Rancho Cordova <br /> Meredith Durant, Kennedy/Jenks, San Francisco <br /> Paul Harpainter, Tracy <br /> California Environmental Protection Agency <br /> Q?Recycled Paper <br />