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Site Background Information Eckert Cold Storage,Manteca,CA July 2,2003 Page 3 of 3 • MW-3 through MW-8, and domestic well DW-1. No separate phase petroleum was noted in the wells, but a strong petroleum odor was noted in groundwater recovered from MW-1 and MW-8; a slight petroleum odor was noted in MW-3; and a moderate "earthy" odor was noted in MW-7. A broken sheen was observed in the groundwater purged from MW-1.The groundwater samples collected from the monitor wells and the domestic well were analyzed for BTEX, TPH-G, and selected gasoline oxygenates/additives including MTBE. Laboratory analytical results for the December 9, 2002, monitoring event were generally consistent with historical laboratory analytical results. The average groundwater elevation was approximately 1.96 feet higher on December 9, 2002, than the previous sampling event conducted on September 30, 2002. The groundwater elevation contours estimated with the depth to water measurements indicated the groundwater gradient was generally towards the west. The groundwater gradient estimated using MW4, MW-6, and MW-7 was 0.00176 ft./ft. towards the northwest, and was generally consistent with historical groundwater gradients estimated for the site. In a letter dated March 7, 2003, Condor proposed that the groundwater monitoring program be reduced to include quarterly sampling of MW4, MW-8, and the domestic well; annual sampling of MW-5 and MW- 7; and no further sampling of MW-1, MW-3,and MW-6. In a fax dated March 21, 2003, Mr. Harlin Knoll of SJCEHD approved this reduction in sampling. Condor conducted the first quarter 2003 groundwater monitoring event at the site on March 28, 2003. Groundwater samples were collected and submitted for laboratory analyses from monitor wells MW-4, MW-8, and domestic well DW-1. No separate phase petroleum was noted in the wells, but a moderate petroleum odor was noted in groundwater recovered from MW-8. The groundwater samples collected from the monitor wells and the domestic well were analyzed for BTEX, TPH-G, and selected gasoline oxygenates/additives including MTBE. Laboratory analytical results for the March 28, 2003, monitoring went were generally consistent with historical laboratory analytical results. The average groundwater elevation was approximately 0.57 feet higher on March 28, 2003, than the previous sampling event conducted on December 9, 2002. The groundwater elevation contours estimated with the depth to water measurements indicated the groundwater gradient was generally towards the northwest. The groundwater gradient estimated using MW-4, MW-6, and MW-7 was 0.0013 ft./ft. towards the north, and was generally consistent with historical groundwater gradients estimated for the site. P:U471 Eckert Cold Storage13471 D 2003 Quarterly Groundwater Monitoring112eportsVune-2003\Site Background.doc