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1 Site Background information <br /> Eckert Cold Storage,Manteca,CA <br /> Page 8 of 8 <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 /> Condor conducted the fourth quarter 2005 groundwater monitoring event on January 5, 2006, which was <br /> also the annual monitoring event. Monitoring wells MW-1, MW-4, MW-5, and MW-8 were scheduled to <br /> be sampled during this quarter; MW-1.and MW-4 as directed by Mr. Harlin Knoll (see above paragraphs). <br /> However, monitoring well MW-7 was inadvertently sampled instead of MW-1. Consequently, it was <br /> decided that Condor would sample MW-1 as part of the subsequent March 2006 quarterly monitoring <br /> event. <br /> No sheen was noted in the inspection sample collected from the wells, but a moderate hydrocarbon odor <br /> was noted in the inspection samples collected from MW-5 and MW-8. The average groundwater <br /> elevation on January 5, 2006, was approximately 2.60 feet higher than the previous sampling event <br /> conducted on September 22, 2005. The site groundwater gradient was calculated to be approximately <br /> 0.0029 ft/ft toward the northwest. <br /> The groundwater samples collected from the monitoring wells were analyzed for BTEX, TPH-G, and <br /> selected gasoline oxygenates/additives including MTBE. Historic laboratory analytical results of <br /> groundwater samples collected from MW-5, prior to December 2004, indicated generally very low <br /> contaminant concentrations. Laboratory analytical results of samples collected from MW-5 in December <br /> 2004, January 2005, and March 2005 indicated higher contaminant concentrations. Laboratory analytical <br /> results during the July 2005, September 2005, and January 2006 monitoring events indicated that <br /> contaminant concentrations had returned to very low levels. <br /> Historic laboratory analytical results of groundwater samples collected from MW-8, prior to December <br /> 2004, indicated generally elevated contaminant concentrations. Laboratory analytical results of samples <br /> collected from MW-8 in December 2004, January 2005, and March 2005 indicated lower contaminant <br /> concentrations relative to the historic results. Laboratory analytical results from the July 2005 monitoring <br /> event indicated that contaminants had increased back to the relatively higher concentrations consistent <br /> with results prior to December 2004. Laboratory analytical results for the September 2005 monitoring <br /> event indicated that concentrations had returned to the low levels relative to historic results, and the <br /> January 2006 laboratory analytical results indicated that these very low levels had continued. <br /> P:13000_prj13471 Eckert Cold Storage13471F 2005 Quarterly groundwater monitoring\Reports\Mar-20061Site Background.doc <br />