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i Ge0logia I Tecbtia la. <br /> 1101 7"Street <br /> Modesto,California 95354 <br /> (209)522-41191 Fax(2 09)5 22-422 7 <br /> ' REPORT <br /> Groundwater Monitoring <br /> 2"a Quarter 2003 <br /> Valley Wholesale Drug Co., Inc. <br /> 1401 W. Fremont Street <br /> ' Stockton, California <br /> Project No. 989.2 <br /> ' July 24, 2003 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 2nd Quarter 2003 groundwater monitoring work that took place <br /> at Valley Wholesale Drug Company on May 19, 2003. <br /> ' The average groundwater elevation decreased by approximately 0.54 feet since the February <br /> 14, 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 N34°E with a slope of 0.0042 ft/ft. Groundwater flow <br /> direction and slope have remained relatively consistent since August of 1995. <br /> ' Laboratory analysis of the groundwater samples collected during the May 2003 monitoring <br /> event show the presence of BTEX and TPH-G in MW-1 and MW-4. BTEX constituents <br /> were not found in any other well during this monitoring event. TPH-G was below <br /> detectable limits in all remaining monitoring wells. Six of the site's nine monitoring wells <br /> showed the presence of MTBE at low concentrations. <br /> ' A plot of TPH-G vs. groundwater elevation for MW-1 indicates that the concentrations of <br /> TPH-G fluctuate with groundwater elevation and that the overall TPH-G concentration has <br /> ' decreased significantly in the past seven years of monitoring (Chart: MW-1). A plot of <br /> MTBE vs. groundwater elevation for MW-6 indicates that the concentrations of MTBE <br />