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Libber-Owens Ford Co. Pmduet Rwovery Synem Installation June 23, 1997 Page-2- maintenance, bi-annual reporting, system decommissioning, and monitor well installation. In addition, a project health and safety plan is attached to this document. 2.0 SITE BACKGROUND On July 24, 1996, an investigation was conducted to evaluate suspected leaking underground product piping associated with an above ground diesel tank and standby generator located at the LOF site (see Test Pit'�1, Figure 3, Appendix A). The excavation work was performed by Erickson Inc., of Richmond, California under the supervision of a Condor geologist. The investigation included the excavation of a portion of the underground piping at a jointed section where the leak likely occurred. Ron Rowe of the PHSlEHD was notified prior to the fieldwork and was present during the excavation. Approximately 15 cubic yards of soil were excavated during the investigation. The excavation was terminated at 13 feet below ground surface (bgs) when floating diesel product was encountered. All soil excavated during the fieldwork had a strong diesel odor. Soil samples were collected from the sidewalls of the excavation at 5 feet, 8 feet and 11.5 feet bgs for chemical analyses. Elevated concentrations of TEPH-diesel and BTEX were detected in each soil sample. On July'_5, 1996, a Condor representative collected a diesel product sample from the excavation for water content analyses. The product surface was located at a depth of approximately 9 feet bgs. The product thickness could not be determined since no groundwater interface was noted. Based on the field observations, it appeared that at least 2 feet of diesel product was present at the bottom of the excavation. The results of the product analyses indicated a water content of 128 ppm. On August 2, 1996, Condor and Oil Equipment Service of San Andreas, California installed a one (1) inch, air powered, diaphragm pump and product recovery piping at the site. Pumping commenced at a rate of approximately eight (8) gallons per minute and continued for approximately one (1) hour. Approximately 520 gallons of diesel were pumped during the initial product removal. On August 6, 1996, Evergreen, Inc. of Newark, California, pumped the product from the tank, including an additional 225-gallons directly from the excavation, and transported the diesel product to their facility in Newark for recycling. Periodic pumping of the excavation has been conducted since the initial product recovery. To date, approximately 3,000 gallons of diesel with little or no water and L� CONDOR