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a <br /> a, <br /> ek MARCH 1995 RECEIVED <br /> QUARTERLY STATUS REPORT <br /> GREYHOUND TERMIlVAL APR 1 9 1995 <br /> STOCKTON, CALIFORNIA ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> • Site Background <br /> One 12,000-gallon diesel UST and associated piping were removed from the site on <br /> May 13, 1991. (Appendix B, June 1992 Quarterly Status Report). No USTs or fuel <br /> lines remain on-site. <br /> A preliminary site investigation was completed in October 1991 The investigation <br /> included installation of three monitoring wells (Figure 1). The preliminary site <br /> investigation report was submitted to the Environmental Health Division of the San <br /> Joaquin County Department of Public Health Services (PHS-EHD) and Regional Water <br /> Quality Control Board (RWQCB) on November 27, 1991 (Appendix C, Quarterly <br /> Status Report, June 1992). <br /> A groundwater monitoring program including monthly water level measurements and <br /> quarterly groundwater sampling and reporting, was established by Greyhound Lines, <br /> Inc. (Greyhound) in June 1992 in order to obtain data to assess whether or not <br /> groundwater beneath the site has been affected The program was approved by PHS- <br /> EHD in a letter dated September 29, 1992, and, modified as noted below, is still in <br /> progress. <br /> A supplemental site assessment was completed in April 1993 Soil samples were <br /> obtained from six soil borings that were advanced on the site during the week of <br /> January 18, 1993. The bonngs were installed in accordance with a work plan, dated <br /> October 28, 1992, that was approved in a telephone discussion between Mr Michael <br /> Infurna of PHS-EHD and David Nickerson of ES on December 8, 1992 Results of the <br /> supplemental soil boring program were submitted to PHS-EHD and RWQCB in a <br /> supplemental site assessment report on April 1, 1993. <br /> On July 22, 1993, PHS-EHD approved the replacement of the quarterly <br /> sampling/monthly monitoring program with a biannual monitoring and groundwater <br /> sampling program. <br /> In August 1994, a second supplemental site assessment was initiated in response to a <br /> letter, dated January 26, 1994, from PHS-EHD indicating that the full extent of soil <br /> contamination had not yet been defined The work plan for the second supplemental <br /> site assessment was submitted to PHS-13141) in June 1994, and approved by a faxed <br /> transmission to ES on June 28, 1994. Eight soil bonngs were advanced on-site to <br /> depths ranging between 45 and 51 5 feet. A total of 71 soil samples were collected <br /> from the borings at 5-feet intervals, and analyzed for BTEX and TPH-D The <br /> maximum total BTEX concentration reported in the samples was jaLQ_Eg/lg The <br /> b CAkG /J <br /> PAREssYR011vOL1 WP1727211108969108969IA1 DOC <br /> 1 <br />