SITE INFORMATION AND CORRESPONDENCE

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Former BP Service Station No. 11193 Page 3 3202 West Hammer Lane September 29, 2011 Stockton, California 95209 conducting a survey of wells and surface water bodies within a 2,000-foot radius of the site. 12/16/99 Date of Surface Water and Water Well Survey and CPT Investigation Report submitted by Cambria Environmental Technology, Inc. that described the results of the surface water and water well survey, and the soil and groundwater analytical results from the advancement of CPT borings CB-1 through CB-6 and the electronic soil logging of CPT borings CB-2E and CB-4E. Report available on Questys, file XR0002988. 02/25/00 Date of Supplemental Investigation Work Plan submitted by Cambria Environmental Technology, Inc. that proposed the destruction of damaged well MW-2, replacement of MW-1 and MW-2, installation of additional monitoring wells, advancement of one deep soil boring for vertical delineation of petroleum hydrocarbon contamination, an evaluation of the pumping effects of the nearby Caltrans irrigation well and a plan for contaminant migration control. 04/19/00 Date of Interim Migration Control Plan submitted by Gettler-Ryan Inc. proposing the weekly removal from MW-1 and MW-2 of a total of approximately 5,000 gallons of groundwater to limit the migration of petroleum hydrocarbon-impacted groundwater and reduce the contaminant concentrations. 05/24/00 Date when a groundwater sample was collected from the Caltrans irrigation well. 06112-13100 Dates when MW-1 R, MW-2R, MW-8, MW-9, and MW-10 were installed. 06/16/00 Date when batch extraction began and approximately 5,000 gallons of groundwater were purged weekly from MW-1 R. Batch extraction included purging groundwater from MW-2R and VW-1. 10/13/00 Date of Supplemental Investigation Report submitted by Cambria Environmental Technology, Inc. that described the destruction of MW-2, installation of replacement wells MW-1 R and MW-2R, and new wells MW-8 and MW-9 on-site, and MW-10 off-site; and reported the analytical results from the collection of soil samples from the well installations and groundwater samples collected from the Caltrans well and newly installed monitoring wells. Cambria Environmental Technology, Inc. also reported that approximately 91 pounds of gasoline and 55 pounds of methyl tertiary-butyl ether (MTBE) were estimated to remain in soil and approximately 4 pounds of gasoline and 11 pounds of MTBE were estimated to remain in groundwater beneath the site; and the Caltrans well had been destroyed. Report available on Questys, file XR0002982. 10/29/01 Date of Work Plan for 5-Day Dual Phase Extraction submitted by SECOR International Incorporated proposing the extraction of soil vapor and groundwater simultaneously from MW-2R and VW-1. 11126-30101 Dates when a five-day dual-phase extraction (DPE) test was conducted by SECOR International Incorporated.