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16 <br /> Ce0togical Technics Inc <br /> ' <br /> 11017"street <br /> Modesto,Cahfornia 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> ' REPORT <br /> Groundwater Monitoring <br /> ' 2nd Quarter 2004 <br /> ' Valley Wholesale Drug Co., Inc. <br /> 1441 W. Fremont Street <br /> Stockton, California <br /> ' Project No 989 2 <br /> August 30, 2004 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 2nd Quarter 2004 groundwater monitoring work that took place at <br /> ' Valley Wholesale Drug Company on April 28, 2004 <br /> ' The average groundwater elevation increased by approximately 0 02 feet since the February <br /> 2004 monitoring event The groundwater elevation is consistent with previously recorded <br /> groundwater elevations at the site Site-specific groundwater gradients were calculated and <br /> ' indicate a bearing of N19°W with a slope of 0 0029 ft/ft Groundwater flow bearing and <br /> slope have remained relatively consistent since August of 1995 <br /> ' Laboratory analysis of the groundwater samples collected during the April 2004 monitoring <br /> event show the presence of BTEX and TPH-G in MW-1 and MW-4 BTEX and TPH-G was <br /> below detectable limits in all remaining monitoring wells MW-2, MW-3, MW-7 and MW- <br /> 101 were non-detect for all analyzed constituents Six of the site's nine shallow <br /> groundwater-monitoring wells showed the presence of MtBE <br /> A plot of TPH-G concentrations versus groundwater elevation for MW-1 indicates that the <br /> concentrations of TPH-G fluctuate with groundwater elevation and that the overall TPH-G <br /> concentration has decreased significantly in the past seven years of monitoring (Chart 1) A <br /> ' plot of MtBE concentrations versus groundwater elevation for MW-6 indicates that the <br /> concentrations of MtBE fluctuate with groundwater elevation and that the overall MtBE <br /> concentration has decreased over time (Chart 2) <br /> f <br />