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1117 Lone Palm Avenue, Suite B <br /> Vm �Tc Modesto, CA 95351 <br /> www.atc-enviro.com <br /> 209.579.2221 <br /> A s s n c I A T e s r N C Fax 209.579.2225:-' <br /> March 10, 2003 <br /> 54.62583.0001 <br /> MAR 13 2003 <br /> EIVVIROWENT HEALTH <br /> Ms. Mary Serra PERMIT/SERVICES <br /> California Regional Water Quality Control Board <br /> Central Valle ion <br /> Re <br /> Y g <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827 <br /> Subject: First 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., prepared this letter report to <br /> serve as a First Quarter 2003 Monitoring Report for the subject site (Figure 1). <br /> INTRODUCTION <br /> ATC's activities during the First Quarter of 2003 included monitoring water levels and collecting <br /> groundwater samples from eight on-site monitoring wells (MW-1 through MW-8), and the <br /> former facility well (FW) shown. on Figure 2, analyzing the collected groundwater samples, and <br /> preparation of this quarterly report. <br /> GROUNDWATER MONITORING AND SAMPLING <br /> i <br /> i <br /> On January 28, 2003, ATC personnel conducted quarterly monitoring and sampling at the above <br /> referenced site. The wells were monitored, purged, and sampled in accordance with the site's <br /> Quality Assurance/Quality Control Plan (Appendix A, "Technical Summary and Report of First <br /> Quarter Monitoring", RESNA, June 10, 1992) and in accordance with California Regional Water <br /> Quality Control Board Central Valley Region Monitoring and Reporting Program No. R5-2002- <br /> 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 eight wells and the former facility well. Groundwater <br /> samples were collected after purging the monitoring wells and verifying the stabilization of pH, <br /> �-� electrical conductivity, and temperature. <br /> 1 i Groundwater levels in the monitoring wells and the facility well ranged from 50.51 to 55.46 feet <br /> below grade, an average increase in the water table of 1.16 feet since water depth was last <br /> measured in October 2002. The groundwater gradient direction on January 28, 2003 was to the <br /> w:1625831quartiyllgr-200 V/RDNMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS r <br />