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IT Corporation 757 Arnold Drive, Suite D Martinez, CA 94553-6526 lot Tf-1 925 370 3990 1W 'i ^ 'i Fax 925 370 3991 ' Vrxarqoup A Member of The IT Group AL yr Mr Bob DeNinno The Southland Corporation 10220 S W Greenburg Road, Suite 470 Portland OR 97233 Subject First Quarter 1999 Monitoring and Sampling Report Former Southland Store No,20632 4627 DaVnci Drive ' Stockton, California IT Corporation Project 102483 ' Dear Mr DeNinno This First Quarter 1999 Monitoring and Sampling Report presents the results of monitoring and sampling ' activities performed by IT Corporation, Inc (Fluor Daniel GTI) at the subject site (Figures 1 and 2. Attachment 1) on February 17, 1999 A summary of activities conducted during this reporting period is provided below Depth to water DT was gauged in four site-related groundwater monitoring wells MW-1 DeP ( tM 9 g 9 g . ( , MW-2, MW-3 and MW-5) ' ■ Groundwater samples were collected from the four monitoring wells and submitted to a California-certified laboratory for analysis of benzene,toluene, ethylbenzene, and total xylenes ' (BTEX), total petroleum hydrocarbons-as-gasoline (TPH-G), and the oxygenates methyl-tert- butyl-ether(MTBE),tert-butanol (TBA), diisopropyl ether(DIPS),ethyl-tert-butyl ether(ETBE), and tert-amyl-methyl ether{TAME) ' Groundwater Monitoring Data Groundwater monitoring of the four wells was performed on February 17, 1999 Before monitoring,the well caps were opened to allow the water in each well to stabilize to atmospheric pressure The DTW ' was measured to the nearest 0 01 foot from the top of the well casing using an ORS environmental Equipment INTERFACE PROBE TM Well Monitoring System A potentiometric surface map was prepared using the groundwater elevation data collected on February 17, 1999 (Figure 2) Based on the groundwater elevation data, groundwater flow is toward the south at a gradient of 0 002 ft/ft The groundwater monitoring results from the February 17, 1999 monitoring and