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Site Background Information <br /> Eckert Cold Storage,Manteca,CA <br /> October 13,2004 <br /> Page 5 of 5 <br /> Condor conducted the first quarter 2004 groundwater monitoring event at the site on March 17, 2004. <br /> Eckert personnel indicated repairs to monitor well MW-5 had been made prior to the first quarter 2004 <br /> groundwater monitoring event with no apparent change in elevation to the well measuring point. <br /> Groundwater samples were collected and submitted for laboratory analyses from monitor wells MW4, <br /> MW-8, and domestic well DW-1. No separate phase petroleum was noted in the wells, but a slight <br /> petroleum odor was noted in groundwater recovered from MW-8. The groundwater samples collected <br /> from the monitor wells and the domestic well were analyzed for BTEX, TPH-G, and selected gasoline <br /> oxygenates/additives including MTBE. Laboratory analytical results for the March 17, 2004, monitoring <br /> event were generally consistent with historical laboratory analytical results. <br /> The average groundwater elevation was approximately 1.11 feet higher on March 17, 2004 than the <br /> previous sampling event conducted on December 17, 2003. The groundwater elevation contours estimated <br /> with the depth to water measurements indicated the groundwater gradient was variable but overall <br /> towards the northwest. The groundwater gradient estimated with a three-point construction using wells <br /> MW-3, MW-4, and MW-6 was 0.001 ft./ft, towards the northwest, and was generally consistent with <br /> historic groundwater gradients estimated for the site. <br /> Condor conducted the second quarter 2004 groundwater monitoring event at the site on June 23, 2004. <br /> Groundwater samples were collected and submitted for laboratory analyses from monitor wells MW-4, <br /> MW-8, and domestic well DW-1. No separate phase petroleum was noted in the wells, but a moderate <br /> petroleum odor was noted in groundwater inspection samples recovered from MW-4 and MW-8. The <br /> groundwater samples collected from the: monitor wells and the domestic well were analyzed for BTEX, <br /> TPH-G, and selected gasoline oxygenates/additives including MTBE. Laboratory analytical results for the <br /> June 23, 2004 monitoring event were generally consistent with historical laboratory analytical results. <br /> The average groundwater elevation was approximately 2.01 feet lower on June 23, 2004 than the previous <br /> sampling event conducted on March 17, 2004. The groundwater elevation contours estimated with the <br /> depth to water measurements indicated the groundwater gradient was variable but overall towards the <br /> northwest. The groundwater gradient estimated with a three-point construction using wells MW-3, MW- <br /> 4, and MW-6 was 0.002 ft/ft towards the northwest, and was generally consistent with historic <br /> groundwater gradients estimated for the site. <br /> P:0000_pd\3471 Eckert Cold Storage\3471 E 2004 Quarterly Groundwater MonitoringlReports\Sept-2004\Site Background.doc <br /> i <br />