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1 Site Background Information <br /> Eckert Cold Storage,Manteca,CA <br /> February 27,2006 <br /> Page 8 of 8 <br /> construction using wells MW-3, MW-4, and MW-6 was approximately 0 0014 ft/ft toward the northwest, <br /> which is generally consistent with historical groundwater gradient directions <br /> The groundwater samples collected from the monitoring wells were analyzed for BTEX, TPH-G, and <br /> selected gasoline oxygenates/additives including MTBE As mentioned above, prior to the December <br /> 2004 monitoring event, historic laboratory analytical results of groundwater samples collected from MW- <br /> 5 indicated generally very low contaminant concentrations Laboratory analytical results of samples <br /> collected from MW-5 in December 2004, January 2005, and March 2005, however, indicated higher <br /> contaminant concentrations (but with a decreasing trend in contaminant concentrations) Laboratory <br /> analytical results of groundwater samples collected from monitor well MW-5 during the previous (July <br /> 2005) monitoring event indicated that contaminant concentrations had returned to very low levels The <br /> third quarter (September 2005) laboratory analytical results indicated that these very low levels had <br /> continued <br /> Conversely, prior to the December 2004 monitoring event, historic laboratory analytical results of <br /> groundwater samples collected from MW-8 indicated generally elevated contaminant concentrations <br /> Laboratory analytical results of samples collected from MW-8 in December 2004, January 2005, and <br /> March 2005 indicated lower contaminant concentrations relative to the historic results Laboratory <br /> analytical results from the previous (July 2005) monitoring event indicated that contaminants in MW-8 <br /> had increased back to the relatively higher concentrations consistent with samples from the well collected <br /> prior to December 2004 Third quarter (September 2005) contaminant concentrations detected in MW-8, <br /> however, indicated that contaminant concentrations had returned to the low levels relative to historic <br /> results <br /> r <br /> P 13000_prj13471 Eckert Cold Storage13471F 2005 Quarterly groundwater momtonng\Reports\January 20061Site Background doe <br /> I <br />