ARCHIVED REPORTS 2nd QUARTER 2011 QUARTERLY REPORT

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Site Background Information: Herman and Helens Marina Page 5 of 13 Quarterly ground water monitoring at the site has been on-going since September 1997 to the present. The inferred ground water flow direction at the site has been consistently toward the southeast. Quarterly surface water sampling of the north and south ends of the drainage ditch (DDN and DDS, respectively) and the east and west ends of the island drainage channel (IDCE and IDCW) adjacent to the site began in October 1998. Between 11 and 13 September 2000, thirteen soil borings (DP-1 through DP-9, SP-1 and HP-1 through HP-3)were advanced at the site. MTBE was detected in the four-foot sample collected from DP-4 and MTBE and TAME were detected in the eight-foot soil sample collected from DP-5. MTBE was detected in the ground water samples collected from borings DP-1 through DP-6, DP-8, DP-9 and HP-2 at concentrations as high as 37,000 pg/I (DP-5). Additional information and tabulated analytical data from this investigation can be found in the Condor-prepared Soil and Ground water Investigation and Sensitive Receptor Survey Report, dated 02 October 2000. In September 2000, a sensitive receptor survey was conducted for the site. The drainage ditch and island drainage channel are the only potential receptors within a 1,000-foot radius of the site. Ms. Margaret Lagorio of San Joaquin County EHD referred the site to the CVRWQCB for oversight by letter to Mr. Marty Hartzell of CVRWQCB, dated 05 January 2001. According to Ms. Lagorio the action was taken because of their determination that the source of the MTBE contamination was the AST system and not the former UST system. In an internal memo dated 29 March 2001, the CVRWQCB concurred with the EHD decision and transferred the site to the CVRWQCB Site Cleanup Section for further oversight. On 02 April 2001, the CVRWQCB issued a letter stating that no further action is required for the former UST system at the site. By letter dated 05 June 2001, Ms. Wendy Cohen of CVRWQCB finalized Monitoring and Reporting Program (MRP) No. 5-01-0835 and approved Additional Ground Water Investigation Work Plan, dated 07 May 2001, prepared by Condor. The MRP describes the ground water monitoring and reporting requirements for the site. The work plan was prepared to further investigate the lateral and vertical extent of impacted ground water. Ms. Cohen also agreed with Condor's recommendation to abandon well MW-1, since it is no longer a necessary monitoring point for the MTBE plume associated with the AST system at the site. On 27 and 28 December 2001 and on 18 and 21 January 2002, AGE advanced ten soil borings at the site to assess the lateral and vertical extent of MTBE-impacted ground water. Soil probe borings 131 through 1310 were advanced vertically to depths ranging from 20 feet bsg to 50 feet bsg. Grab ground water samples were collected from every probe boring, with the exception of B5. Advanced GeoEnv iron mental,Inc.