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Californiagegional Water Quality Cgptrol Board <br /> Central Valley Region <br /> Katherine Hart, Chair <br /> 11020 Sun Center Drive,#200, Rancho Cordova, California 95670-6114 <br /> Mathew Rodriguez (916)464-3291 • FAX (916)464-4645 Edmund G.Brown Jr. <br /> Secretary for http://www.waterboards.ca.gov/centralvalley Governor <br /> Environmental Protection <br /> 8 August 2011 RECEIVED <br /> AUG 1 1 2011 <br /> Mr. Fred Jacobus <br /> c/o Ms. Jeanne Homsey ENVIRONMENTAL HEALTH <br /> ATC Associates, Inc. PERMIT/SERVICES <br /> 1117 Lone Palm Avenue, Suite 201 <br /> Modesto, CA 95351 <br /> REVISED MONITORING AND REPORTING PROGRAM NO. R5-2011-0815, <br /> DIAMOND FOODS INC., 1050 SOUTH DIAMOND STREET, SAN JOAQUIN COUNTY <br /> Diamond Foods Inc. is monitoring groundwater at their walnut processing facility under <br /> Monitoring and Reporting Program (MRP) No. R5-2004-0840 due to a release of total <br /> and hexavalent chromium. In a letter dated 25 March 2011, you requested a revision to <br /> your MRP. Central Valley Water Board staff revised your MRP to eliminate the <br /> quarterly monitoring schedule that was required for your monitoring wells <br /> In your letter, you requested semi-annual monitoring and eliminating VOC analysis for <br /> all active wells. After review of the historical groundwater data, Water Board staff <br /> concur that all Site wells should be sampled semi-annually. However, Diamond Foods <br /> needs to continue analyzing for VOCs because monitoring wells MW-7 and MW-9 <br /> consistently contain PCE concentrations that exceed our maximum contaminant level <br /> for drinking water of 5 pg/L. However, we have decreased the VOC analysis schedule <br /> from quarterly to annually. <br /> Revised MRP No. R5-2011-0815 is now in effect. The next required annual report is <br /> due 1 November 2011. A copy of the new MRP is included for your records. If you <br /> have any questions in regard to this matter, you may contact Roberto Cervantes at <br /> 916.464.4682 of by email at rcervantes(a)waterboards.ca.gov. <br /> t' - <br /> Gerald Djuth, PE <br /> Acting Chief, Private Sites Cleanup Unit <br /> Enclosure <br /> cc: SanJoaquin County Environmental Health Department <br /> California Environmental Protection Agency <br /> ed Recycled Paper <br />