SITE INFORMATION AND CORRESPONDENCE

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Former BP Service StationlVo. 11193 �"'� Page 2 3202 West Hammer Lane September 29, 2011 Stockton, California 95209 A 11/09/94 Date of letter/work plan submitted by EMCON Associates proposing the advancement of two soil borings for the collection of soil and groundwater samples as part of a property transfer baseline assessment for the transfer of ownership of the property from British Petroleum (BP) Oil Company to Tosco Northwest Company. 11/22/94 Date when two grab soil samples, TD-2 and TD-3, were collected beneath the eastern end of the two dispenser islands; soil and groundwater samples were collected from soil borings THP-1, THP-2 and VW-1; and VW-1 was completed as a vapor extraction well. 02/13/95 Date of Baseline Assessment Report submitted by EMCON Associates describing soil lithology and soil and groundwater analytical results from the advancement of TD-2, TD-3, THP-1, THP-2 and installation of VW-1. Report available on Questys, file XR0002956. 02/16/95 Date when Alisto Engineering Group performed bail-down testing using monitoring wells MW-1, MW-2 and MW-5 to evaluate aquifer properties beneath the site. 02/21/95 Date of Baildown Test Results submitted by Alisto Engineering Group describing the results from the slug test. Report available on Questys, file XR0002956. 09/18/95 Date of Revised Analysis of Baildown Test Results submitted by Alisto Engineering Group presenting the revised test results and calculations of hydrogeologic parameters for MW-1. 08/21/98 Date of Work Plan for Soil Sampling Following Product Piping Removal submitted by Gettler-Ryan Inc. 10/12/98 Date of Work Plan Addendum submitted by Gettler-Ryan Inc. that described the collection of compliance samples from the UST excavation during the removal and replacement of the existing USTs at the site. 12110-22198 Date when one 8,000-gallon and two 10,000-gallon single-walled fiberglass unleaded gasoline USTs, dispensers and associated product dispenser piping were removed from the site under permit issued by the San Joaquin County Environmental Health Department (EHD) and MW-1 was destroyed under EHD permit to allow enlargement of the existing UST pit for installation of new USTs. 04/12/99 Date of Underground Storage Tank and Product Piping Replacement Report submitted by Gettler-Ryan Inc. that presented the soil and groundwater analytical results from the removal of the USTs, dispensers, and associated piping, and following additional excavation at the site. Report available in file of Unit III. 08/12/99 Date of CPT Investigation Work Plan submitted by Cambria Environmental Technology, Inc. that proposed the advancement of six soil borings to approximately 30 feet bsg using cone penetration test (CPT) technology and