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CV <br /> 11'17 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> www atc-enviro com <br /> 209 579 2221 <br /> .,ATC <br /> A S S O C I A T E S I N C <br /> Fax 209 579 2225 <br /> January 5, 2004 <br /> 54 62583 0001 J AN 1 5 2004 <br /> d,4,r uNMENT HEALTH <br /> PERMIT/SERVICES <br /> Ms Mary Serra <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827 <br /> Subject Fourth Quarter 2003 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 2003 Monitoring Report for the subject site (Figure 1) <br /> INTRODUCTION <br /> I <br /> ATC's activities during the Fourth Quarter of 2003 included monitoring water levels and <br /> collecting groundwater samples from nine on-site monitoring wells (MW-1 through MW-9), and <br /> the inactive facility well (FW) shown on Figure 2, analyzing the collected groundwater samples, <br /> and preparation of this quarterly report <br /> GROUNDWATER MONITORING AND SAMPLING <br /> On October 22, 2003, 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 , dated July 3, 2002 <br /> I <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 Fallowing collection of the groundwater samples, <br /> dissolved oxygen and turbidity were measured in each well <br /> Groundwater levels in the shallow monitoring wells ranged from 55 02 to 57 59 feet below <br /> grade, an average decrease in the water table of 1 79 feet since water depth was last measured in <br /> July 2003 The groundwater gradient direction on October 22, 2003 was to the northeast with an <br /> average magnitude of 0 001 ft/ft This appears to be within historical parameters, which have <br /> s lenvironmenta11625831quarteriyl4gr-2003 doe 1 <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br /> I <br />