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1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> http//www atcassociates com"%TC <br /> 209 579 2221 <br /> F <br /> ASSOC IATES INC Fax 209 579 2225 ' <br /> September 13, 2004 <br /> 54 62583 0001 SEP 1 3 2004 <br /> ENVIRON,'liFr, <br /> PERN11T/SE,3V1C STN <br /> Ms Mary Serra <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 Third 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 Third Quarter 2004 Monitormg Report for the subject site (Figure 1) <br /> INTRODUCTION <br /> ATC's activities during the Third Quarter of 2004 included monitoring water levels, collecting <br /> groundwater samples from nine on-site monitoring wells (MW-1 through MW-9), the inactive <br /> facility well (FW), and the City of Stockton's inactive municipal well WP-1, shown on Figure 2, <br /> and presented with this quarterly report <br /> GROUNDWATER MONITORING AND SAMPLING <br /> On July 13, 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, the inactive municipal well, and the inactive <br /> facility well Groundwater samples were collected after purging the monitoring wells and <br /> verifying the stabilization of pH, electrical conductivity, and temperature Following collection <br /> of the groundwater samples, dissolved oxygen was measured in each well <br /> Groundwater levels in the shallow monitoring wells (MW-1 through MW-8) ranged from 54 49 <br /> to 56 75 feet below grade, an average decrease in the water table of 1 28 feet since water depth <br /> was last measured on April 20, 2004 The groundwater gradient direction on July 13, 2004 was <br /> to the east with an average magnitude of 0 0011 ft/ft This appears to be generally, within <br /> s lenvironrnentai1625831quarterlyl3gr-2004 doc 1 <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />