SITE INFORMATION AND CORRESPONDENCE FILE 2

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EXECUTIVE SUMMARY CONOCOPHILLIPS (CIRCLE K) SITE CLEANUP PROGRAM CONOCOPHILLIPS CIRCLE K 1205 16470 CAMBRIDGE DRIVE LATHROP, CALIFORNIA 95330 SAN JOAQUIN COUNTY SITE CODE: 507198 December 18, 2007 ConocoPhillips previously owned and occupied the property located at 16470 Cambridge Drive in Lathrop, California and operated underground storage tanks that stored gasoline. The site currently remains a gasoline service station and convenience store owned and operated by Circle K Stores, Inc. Some of the gasoline tanks and dispenser piping leaked gasoline during ConocoPhillips operation and resulted in impacted soil and groundwater beneath the site. A program to clean the soil and groundwater beneath the site is tentatively approved by the San Joaquin County Environmental Health Department, pending public notification. The cleanup program will consist of ozone injection as the groundwater cleanup method and air removal as the soil cleanup method. The groundwater cleanup will be accomplished by injecting ozone beneath the groundwater surface which will bubble its way upward through the water and react with the gasoline to break it down to carbon dioxide and water. The soil cleanup will be accomplished by removing air containing gasoline vapors from the soil beneath the site and destroying the gasoline vapors inside a treatment system monitored by the Air Pollution Control District. The results of this cleanup program will be clean soil and groundwater beneath the site and clean air released to the atmosphere through the treatment system. The installation of the treatment system at the site will take an estimated six months. The treatment system will begin operation at the site in early mid 2008 and operate for an estimated 3 years following installation. All activities associated with the cleanup program will be confined to the service station site and parking lot north of the service station and will not impact any other neighboring properties (with the possible exception of intermittent construction noise during business hours while the treatment system is being installed). The site will continue to be operated as a gasoline service station during after the cleanup program.