SITE INFORMATION AND CORRESPONDENCE

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Y+ - a CHRONOLOGY HAMMER LANE SHELL 7910 LOWER SACRAMENTO ROAD STOCKTON CA 95210 12/20/88 Four underground storage tanks (UST's) removed this date under permit and inspection by SJCIEHD. 01/06/89 Soil samples collected from under dispensers this date. Analytical results reported contamination beneath northern dispensers. 01/18/89 Prop 65 #89-023 submitted this date for contamination discovered following tank removal. 01/22/89 Soil samples collected from beneath piping lines this date. 08/14/89 Three soil borings drilled in dispenser and former UST area, and three groundwater monitoring wells installed around the former UST area. . Quarterly groundwater monitoring and sampling initiated. 10/27/89 Site placed in Local Oversight Pilot Program this date. 12/20/89 NOR letter sent this date to Shell Oil Company. 02/16/90 Prop 65 #90-037 submitted this date for contamination reported in monitoring wells. 12/30/97 Two soil borings installed near northwestern dispenser island. A grab groundwater sample from a perched water zone reported contaminated. See Cambria's Site Investigation-Report dated March 10, 1998 1997- Quarterly groundwater monitoring and sampling continues at site. present 10/16/02 Two soil borings installed near northwestern dispenser island to confirm the presence of the perched groundwater. No evidence of perched water observed. Grab groundwater samples were collected from 41.5 feet bsg: Soil samples were collected every five feet from each boring. No contamination reported in the soil samples; 7.1 ppb MtBE reported in one of the water samples. See Cambria's Site Investigation Report and Request for Closure dated July 17, 2003. 02/01/04 Quarterly groundwater monitoring and sampling report submitted this date. Concentrations of MtBE reported were below the secondary MCL. 02/13/04 Updated sensitive receptor survey submitted this date. There are no threatened 'receptors at this site.