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OV <br /> 1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> www atc-enviro com <br /> 209 579 2221 <br /> %TC Fax 209 579 2225 <br /> A S S O C I A T E S 1 N C <br /> June 15, 2004 <br /> 54 62583 0001 ��\� � �r, <br /> r JUN 1 6 2004 <br /> Ms Mary Serra ENVIRONMEN 1 ii,, ri <br />' California Regional Water Quality Control Board PERMIT/SERVICES <br /> Central Valley Region <br />' 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br />' Subject Second Quarter 2004 Monitoring Report, Diamond Walnut Growers, 1050 South <br /> Diamond Street, Stockton, California <br /> rDear Ms Serra <br /> ATC Associates Inc , on behalf of Diamond Walnut Growers, Inc , has prepared this letter report <br /> to serve as a Second Quarter 2004 Monitoring Report for the subject site (Figure 1) <br /> INTRODUCTION <br /> ATC's activities during the Second Quarter of 2004 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 and preparation of this quarterly report <br /> tGROUNDWATER MONITORING AND SAMPLING <br /> On April 20, 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 , dated July 3, 2002 <br /> Fieldwork consisted of measuring depth to groundwater, purging the on-site monitoring wells, <br /> and collecting samples from each of the mne 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 Following collection of the groundwater samples, <br /> dissolved oxygen was measured in each well <br /> Groundwater levels in the shallow monitoring wells (MW-1 through MW-8) ranged from 53 31 <br /> to 55 57 feet below grade, an average increase in the water table of 0 99 feet since water depth <br /> was last measured in January 2004 The groundwater gradient direction on April 20, 2004 was to <br /> the east with an average magnitude of 0 013 ft/ft This appears to be within historical parameters, <br /> which have indicated the predominant groundwater gradient direction is to the east with variation <br /> s lenvlronmenta11625831quarteriyl2gr-2004 doc 1 <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br /> 1 <br />