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I <br /> C,eokgical ncfwks Inc. . <br /> 1101 7'Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> ' REPORT <br /> ' Groundwater Monitoring <br /> 4th Quarter 2003 <br /> ' Valley Wholesale Drug Co., Inc. <br /> 1401 W. Fremont Street <br /> ' Stockton, California <br /> Project No. 989.2 <br /> March 12, 2004 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 4th Quarter 2003 groundwater monitoring work that took place <br /> at Valley Wholesale Drug Company on November 25, 2003. <br /> ' The average groundwater elevation decreased by approximately 0.67 feet since the <br /> September 2003 monitoring event. The groundwater elevation is consistent with previously <br /> recorded groundwater elevations at the site. Site-specific groundwater gradients were <br /> ' calculated and indicate a bearing of N65°W with a slope of 0.0083 ft/ft. The groundwater <br /> bearing, calculated from measurements recorded during the November 2003 monitoring <br /> event, is the most westerly to date. Groundwater flow bearing and slope have remained <br /> ' relatively consistent since August of 1995. <br /> ' Laboratory analysis of the groundwater samples collected during the November 2003 <br /> monitoring event show the presence of BTEX and TPH-G in MW-1 and MW-4. BTEX and <br /> TPH-G was below detectable limits in all remaining monitoring wells. MW-2, MW-3, MW- <br /> ' 7 and MW-101 were non-detect for all analyzed constituents. Six of the site's nine shallow <br /> groundwater-monitoring wells showed the presence of MtBE at concentrations between 1.0 <br /> and 38 pg/L. <br /> ' A plot of TPH-G concentrations versus groundwater elevation for MWA indicates that the <br /> concentrations of TPH-G fluctuate with groundwater elevation and that the overall TPH-G <br />