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AMBRIA The existing well network indicates that the plume is localized The extent of fuel oxygenates in groundwater is defined below 10 ppb in all directions except southeast of the site Cambria has proposed wells east and southeast of MW-7 to complete lateral delineation Therefore, Cambria proposes continued quarterly groundwater sampling at this site, to monitor the expected continued degradation of fuel oxygenates in groundwater beneath the site and to confirm that the plume is shrinking and not migrating Vertical Groundwater Definition: In the August 17, 2004 letter, SJCEHD requests that Shell submit a work plan to define the vertical extent of fuel oxygenates in groundwater Cambria installed well MW-11, screened from 90 to 100 fbg on July 9, 2003, and low concentrations of MTBE and TBA were initially detected However, TBA has not been detected in groundwater from the well since the initial sampling event, and MTBE has also been below detection limits for two quarters These groundwater analytical data demonstrate that the vertical extent of fuel oxygenates in groundwater is defined above 90 fbg in groundwater by well MW-1 Lateral Groundwater Definition- In the August 17, 2004 letter, SJCEHD requests that Shell install a well between existing wells MW-6 and MW-7 to further define the lateral extent of fuel oxygenates in groundwater near the eastern edge of the site In our December 13, 2002 Response Letter/Sate Investigation and Third Quarter 2002 Groundwater Monitoring Report/Work Plan, Cambria proposed well MW-12, located between MW-6 and MW-7 on the Teresi Trucking property The well is located approximately 50 feet northeast of well MW-7 If SJCEHD would prefer, this proposed well location could be moved onsite and/or north of its current location to provide further lateral assessment near the eastern edge of the site RESPONSE LETTER Adjacent Site Access. Cambria sent a copy of Shell's access agreement to the owners of the Teresi Trucking property, located adjacent to the site in February 2003 This agreement was not returned to us During May 2003, a representative of Teresi Trucking contacted Cambria by telephone and explained that Shell would not be granted access to install the proposed wells on this property Cambria will provide SJCEHD with a copy of this access agreement and contact information for Teresi Trucking representatives under separate cover Geotracker Data. Cambria will upload the Geo Z well survey data for wells MW-1, MW-2, and MW-3 into the Geotracker database as requested 0955 9