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�1 DECEMBER 1996 QUARTERLY STATUS REPORT GREYHOUND TERMINAL STOCKTON, CALIFORNIA • Site Background One 12,000-gallon diesel UST and associated piping were removed from the site on May 13, 1991 (Appendix B, June 1992 Quarterly Status Report) No USTs or fuel lines remain on-site A preliminary site investigation was completed in October 1991 The investigation included installation of three monitoring wells (Figure 1) The preliminary site investigation report was submitted to the Environmental Health Division of the San Joaquin County Department of Public Health Services (PHS-EHD) and Regional Water Quality Control Board (RWQCB) on November 27, 1991 (Appendix C, Quarterly Status Report, June 1992) A groundwater monitoring program including monthly water level measurements and quarterly groundwater sampling and reporting, was established by Greyhound Lines, Inc (Greyhound) in June 1992 in order to assess whether or not groundwater beneath the site was affected The program, approved by PHS-EHD in a letter dated September 29, 1992, and, modified as noted below, is still in progress Soil samples were collected from six soil borings during the week of January 18, 1993 The borings were drilled in accordance with a work plan, dated October 28, 1992, and then was approved in a telephone discussion between Mr Michael Infurna of PHS-EHD and David Nickerson of Parsons ES on December 8, 1992 Soil sample results were submitted to PHS-EHD and RWQCB in a supplemental site assessment report on April 1, 1993 On July 22, 1993, PHS-EHD approved the replacement of the quarterly sampling/monthly monitoring program with a biannual monitoring and groundwater sampling program In August 1994, a second supplemental site assessment was initiated in response to a letter, dated January 26, 1994, from PHS-EHD indicating that the full extent of soil contamination had not yet been defined The work plan for the second supplemental site assessment was submitted to PITS-EHD in June 1994, and approved by a faxed transrrussion to Parsons ES on June 28, 1994 Eight soil borings were advanced on-site to depths ranging between 45 and 515 feet A total of 71 soil samples were collected from the borings at 5-feet intervals, and analyzed for BTEX and TPH-D The maximum total BTEX concentration reported in the samples was 3,910 pg/kg The maximum TPH-D concentration was 16,000 mg/kg The second supplemental site assessment report was submitted to PHS-EHD in November 1994 PARESSYROINOL1 WP172887M89691089691,03 WW6