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e <br /> CONESTOGA-ROVERS <br /> &ASSOCIATES <br /> May 4,2012 Reference No.241534 <br /> -2- <br /> CRA evaluates the groundwater monitoring data from each well(the receptor) and creates a <br /> degradation trend analysis for each analyte from the maximum detection through the latest <br /> sampling date. The starting point can vary from the maximum detection if the transport <br /> mechanisms are not sufficiently linear. For example,groundwater monitoring data may show <br /> that the maximum concentration occurred at some point in the past and that degradation <br /> seemed to be occurring. However, due to the heterogeneous nature of the subsurface and <br /> seasonal groundwater level fluctuations,the duration does not demonstrate a steady <br /> degradation behavior. The concentrations of the analyte may increase one or more times before <br /> showing consistent attenuation towards the concentration objective. <br /> Yours truly, <br /> CONESTOGA-ROVERS&ASSOCIATES <br /> /"'. " 6� <br /> Mike Murphy <br /> Je W. Neely,PG <br /> MRM/pc/3 <br /> cc: Sam Brenneke,Shell Oil Products US via Livelink <br /> Adrienne Ellsaesser,San Joaquin Co Env.Health Dept.,600 E.Main St.,Stockton CA <br /> 95202 <br /> Miguel Torres,Shell Oil Products US,3515 Navy Dr.,Stockton CA 95203 <br /> Rita Koehnen,Port of Stockton,P.O. Box 2089,Stockton CA 95203 <br /> Mark O'Brien,ERS,1600 Riviera Ave., #310,Walnut Creek CA 94596 <br /> Thomas Kosel,76 Broadway,Sacramento CA 95818 <br /> Worldwide Engineering,Environmental,Construction,and IT Services <br />