SITE INFORMATION AND CORRESPONDENCE FILE 2

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Stantec Quarterly Status Summary Report—First Quarter 2012 ARCO Service Station No. 2186 May 31, 2012 IT Group of Roseville, California (IT) performed a well search in June 2000. The IT data identified two agricultural wells located 400 ft west-northwest and 900 ft northeast of the site, and a third well located approximately 1,800 ft northwest of the site. Delta Environmental Consultants of Rancho Cordova, California field verified the well locations and operational status of these wells. The wells located 400 ft west-northwest and 900 ft northeast of the site are owned by the City of Stockton and are used for irrigation purposes at Oak Park. The well situated 1,800 ft northwest of the site is located at St. Mark's Church. Pinnacle's 1998 well survey previously identified three wells at this site. Further information regarding the actual number and use of the wells at St. Mark's Church could not be verified. The well situated 400 ft west-northwest of the ARCO station appears to be the Oak Park well identified in the Pinnacle survey. According to the Geotracker website (http://geotracker.swrcb.ca.gov), a total of 12 wells are located within a one-mile radius of the site. The California Water Service Company (CWSC) owns seven of the 12 municipal wells (one of the seven wells is currently inactive and another of the seven wells has reportedly been destroyed). St. Luke's Church owns two domestic wells (one well is reportedly destroyed). The University of the Pacific owns two domestic wells (both wells are reportedly inactive). First Baptist Church owns one domestic well. On August 22, 2007, SECOR International Inc. of Rancho Cordova, California contacted the CWSC to find the approximate distance from each of the five active wells to the site and area of influence of each well. According to a representative of the CWSC, five wells are currently active and are located at least 2,000 ft and as far as 5,000 ft from the site. The well located 2,000 ft from the site has not had any complaints from the public or detections of contaminants. Monitoring and Sampling No monitoring and sampling was performed during 1Q12. No further monitoring and sampling will be performed at the site as the site has been approved for closure. Current Assessment Activities No assessment activities were conducted during 1Q12. Remediation Status There is no active remediation present at the site. Characterization Status Petroleum hydrocarbon impact in the soil and groundwater has been adequately delineated by the existing well network and previous site assessment activities. Waste Disposal Summary No waste was generated during 1Q12. 2186 QSSR 1 Q12.doc 2