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Site Background Information Eckert Cold Storage,Manteca,CA February 27,2006 • Page 4 of 8 Condor conducted the third quarter 2003 groundwater monttonng event at the site on September 2 and 3, 2003 Groundwater samples were collected and submitted for laboratory analyses from monitoring wells MW-4, MW-8, and domestic well DW-1 No separate phase petroleum was noted in the wells, but a slight petroleum odor was noted in groundwater recovered from MW-8 The groundwater samples collected from the monitoring wells and the domestic well were analyzed for BTEX, TPH-G, and selected gasoline oxygenates/additives including MTBE Laboratory analytical results for the September 2 and 3, 2003, monitoring event were generally consistent with historical laboratory analytical results The average groundwater elevation was approximately 2 37 feet lower on September 2, 2003, than the previous sampling event conducted on June 5, 2003 Water level data from monitoring well MW-7 was not included in the September 2, 2003 figures Water level measurement of monitoring well MW-7 was obstructed by a root mass in the casing The root mass in monttonng well MW-7 was removed on September 3, 2003 by using a small diameter auger 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 MW4, MW-5, and MW-6 was 0 0020 ft/ft towards the northwest, and was generally consistent with historical groundwater gradients estimated for the site Condor conducted annual groundwater monitoring on December 12, 2003 during the fourth quarter 2003 groundwater monitoring event at the site Groundwater samples were collected and submitted for laboratory analyses from annually monitored wells MW-5 and UW-7, as well as from quarterly monitored wells MW4, MW-8, and domestic well DW-1 No separate phase petroleum, sheen, or odor was noted in the field inspection samples collected from the wells Monitoring well MW-5 was observed to have a damaged monument, and the well casing appeared to be broken lust below the ground surface Groundwater samples collected from the monitoring wells and the domestic well were analyzed for BTEX, TPH-G, and selected gasoline oxygenates/additives, including MTBE Laboratory analytical results for the December 12, 2003, monitoring event were generally consistent with historic laboratory analytical results The average groundwater elevation was approximately 0 10 feet lower on December 17, 2003 than the previous sampling event conducted on September 2, 2003 The groundwater elevation contours estimated with the depth to water measurements indicated the groundwater gradient was variable but overall towards the northwest The groundwater gradient estimated with a three-point construction using wells MW-3, MW4, and MW-6 was 0 002 ft/ft towards the northwest, and was generally consistent with historic groundwater gradients estimated for the site Condor recommended that monitoring well MW-5 be repaired and resurveyed, or destroyed Condor conducted the first quarter 2004 groundwater monitoring event at the site on March 17, 2004 Eckert personnel indicated repairs to monitoring well MW-5 had been made prior to the first quarter 2004 groundwater monitoring event with no apparent change in elevation to the well measunng point Groundwater samples were collected and submitted for laboratory analyses from monitonng wells MW-4, MW-8, and domestic well DW-1 No separate phase petroleum was noted in the wells, but a slight petroleum odor was noted in groundwater recovered from MW-8 The groundwater samples collected from the monitoring wells and the domestic well were analyzed for BTEX, TPH-G, and selected gasoline oxygenates/additives including MTBE Laboratory analytical results for the March 17, 2004, monitoring event were generally consistent with historical laboratory analytical results •