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edd ical Tec" cs Inc. <br /> ' 1 101 7'h Street <br /> Modesto,California 95354 <br /> (209)522-4119 1 Fax(209)5224227 <br /> t REPORT <br /> ' Groundwater Monitoring <br /> 1" Quarter 2003 <br /> ' Valley Wholesale Drug Co., Inc. <br /> 1401 W. Fremont Street <br /> ' Stockton, California <br /> Project No. 989.2 <br /> tApril 30, 2003 <br /> MEXECUTIVE SUMMARY <br /> ' This report summarizes the I" Quarter 2003 groundwater monitoring work that took place at <br /> Valley Wholesale Drug Company on February 14, 2003. <br /> The average groundwater elevation increased by approximately 0.64 feet since the <br /> November 19, 2002 monitoring event. The groundwater elevation is consistent with <br /> previously recorded groundwater elevations at the site. Site-specific groundwater gradients <br /> were calculated and indicate a bearing of N30°E with a slope of 0.0046 ft/ft. Groundwater <br /> flow direction and slope have remained relatively consistent since August of 1995. <br /> ' Laboratory analysis of the groundwater samples collected during the February 2003 <br /> monitoring event show the presence of BTEX and TPH-G in MW-1, MW-3 and MW-4. <br /> ' BTEX constituents were not found in any other well during this monitoring event. TPH-G <br /> was below detectable limits in all remaining monitoring wells. Six of the site's nine <br /> monitoring wells showed the presence of low levels of MTBE. <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 /> I <br />