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r <br /> (:VRTC <br /> STC �ssociaces Inc <br /> ffil��E�YE[D' Lonc Palm -kvenue Suite B <br /> Modesto Cahfomia u535 i <br /> A S S O C r A T c S I N C JUL 12 2005 F-LX <br /> EMARGNMENT HEALTH <br /> July ; 2005 <br /> 54 62583 0001 PERMITJSERVICE5 <br /> Ms Mary Serra <br /> California Regional Water Quality Control Board <br /> Central Vallev Region <br /> 11020 Sun Center Drive, Suite 1'00 <br /> Rancho Cordova, CA 95670 <br /> Subject Second Quarter 2005 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 Second Quarter 2005 Morutoring Report for the subject site (Figure 1) <br /> i <br /> INTRODUCTION <br /> ATC's activities during the Second Quarter of 2005 included monitoring water levels, collecting <br /> groundwater samples from rune on-site monitoring wells MW-1 through MW-9 shown on Figure <br /> 2 and preparing this quarterly report <br /> GROUNDWATER MONITORING AND SAMPLING <br /> On April 19, 2005 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 R5-2004-0840 for Diamond Walnut Growers, Inc issued November 24, <br /> 2004 <br /> Fieldwork consisted of measuring depth to groundwater purging the on-site monitoring wells <br /> and collecting samples from each of the nine wells (NIWI-MW9) Groundwater samples were <br /> collected after purging the monitoring wells and verifying the stabilization of pH, electrical <br /> conductivity, and temperature Turbidity was also measured in the field Following collection of <br /> the groundwater samples, dissolved oxygen was measured in each well <br /> Groundwater levels in the shallow monitoring wells (MW-I through MW-8) ranged from 53 07 <br /> to 55 93 feet below grade, an average increase in the water table of 1 43 feet since water depth <br /> was last measured on January 19 2004 The groundwater gradient direction on April 19 2005 <br /> was to the east with an average magnitude of 0 0019 ft/ft This appears to be generally within <br /> 5%envlrorimencal1625831quarterlvllgr-2UO5 doc E <br />