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i SCSA—University Park Site Background Page 5 i On February 3 and 4, 2005, a Condor representative was on Site to conduct the first quarter 2005 quarterly groundwater monitoring event. No separate phase petroleum or sheen was noted in the groundwater recovered from the wells. Field inspection samples collected from monitor wells MW-2 and MW-3 were noted as having slight and moderate petroleum hydrocarbon odor, respectively. The average i depth to groundwater in the monitor wells was 41.70 feet below the surveyed well collar measuring points (the measuring points are slightly below the ground surface). The average groundwater elevation measured in the monitoring wells decreased 1.06 feet between November 10, 2004 and February 3, 2005. The estimated groundwater gradient for the Site on February 3, 2005, was 0.0094 ft/ft to the east. Historic gradient directions have ranged from approximately due east to approximately due'soutb. The Site water table elevation decreased relatively steadily from approximately 20 feet below mean sea level to. : approximately 25 feet below mean.sea level during the Site monitoring history.(December 2001 to February 2005). The laboratory analytical results of the groundwater samples collected from MW-1, MW-2, and MW-3 on February 3 and 4, 2005 were generally consistent with the historic laboratory analytical results.. On May 2, 2005, a Condor representative was on Site to conduct the second quarter 2005 quarterly groundwater monitoring event. No separate phase petroleum or sheen was noted in the groundwater recovered from the wells. The field inspection sample collected from monitor well MW-3 was noted as having a strong sulfur odor. The average depth to groundwater in the monitor wells was 40.09 feet below the surveyed -well collartreasuring points. The average groundwater elevation measured in the monitoring wells increased 1.62 feet between February 3, 2005 and May 2, 2005. The estimated groundwater gradient for the Site on May 2, 2005, was 0.015 ft/ft to the north. Historic gradient directions have ranged from approximately due east to approximately due south, so the gradient direction on May 2, 2005 was inconsistent with site historic gradient directions. The Site water table has dropped from approximately 38 feet below the ground surface to approximately 42 feet below the ground surface between December 2001 and May 2005. The laboratory analytical results of the !groundwater samples collected from MW-1, MW-2, and MW-3 on May 2, 2005 were generally consistent with the historic laboratory analytical results. i 1 t r 3 - P:13000_pd\3024 CSUS-Multi-Campus�3024D\Reportsaeports�3gmr20051Site Background.doc - r i