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1117 tone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> Cvv <br /> http//www atcassociates corn <br /> YA209 579 2221 T C <br /> Fax 209 579 2225 <br /> A S S O S I A T 8 $ I K C <br /> January 15, 2005 <br /> 54 62583 0001 <br /> ENVIRONA4ENT HEALTH <br /> Ms Mary Serra <br /> PERN TISER VICES <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Subject Fourth Quarter 2004 Monitoring Report, Diamond Walnut Growers, 1050 South <br /> Diamond Street, Stockton, California <br /> Dear Ms Serra <br /> ATC Associates Inc , on behalf of Diamond Walnut Growers, Inc , has prepared this letter report <br /> to serve as a Fourth Quarter 2004 Monitoring Report for the subject site (Figure 1) <br /> INTRODUCTION <br /> ATC's activities during the Fourth Quarter of 2004 included monitoring water levels collecting <br /> groundwater samples from nine on-site monitoring wells (MW-1 through MW-9) and the <br /> inactive facility well (FW), shown on Figure 2, and preparing this quarterly report <br /> GROUNDWATER MONITORING AND SAMPLING <br /> On October 19, 2004, ATC personnel conducted quarterly monitoring and sampling at the above <br /> referenced site The wells were gauged purged, and sampled in accordance with the California <br /> Regional Water Quality Control Board Central Valley Region (RWQCB) Monitoring and <br /> Reporting Program No R5-2002-0821 for Diamond Walnut Growers, Inc , issued July 3, 2003 <br /> Fieldwork consisted of measuring depth to groundwater, purging the on-site monitoring wells, <br /> and collecting samples from each of the nine wells and the inactive facility well Groundwater <br /> samples were collected after purging the monitoring wells and verifying the stabilization of pH <br /> electrical conductivity, and temperature Turbidity and redox potential were also measured in the <br /> field Following collection of the groundwater samples, dissolved oxygen was measured in each <br /> well <br /> Groundwater levels in the shallow monitoring wells (MW-1 through MW-8) ranged from 55 65 <br /> to 58 08 feet below grade, an average decrease in the water table of 1 36 feet since water depth <br /> was last measured on July 13, 2004 The groundwater gradient direction on October 19, 2004 <br /> was to the east with an average magnitude of 0 0010 ft/ft This appears to be generally within <br /> s lenvironmentall625831qu uleriyl4gr-2004 doc I <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />