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ruse � 4 REMEDIAL ACTION SUMMARY Following removal of the UST, approximately 371 tons of diesel fuel-impacted soil were removed from the site and disposed at the BFI Landfill located in Livermore, California on March 23, 1999. The UST excavation was backfilled with clean soil imported to the site. SCOPE OF WORK Project Objective: The primary objectives of this site investigation will be to determine the horizontal and vertical extent of petroleum-impacted soil, and to assess whether groundwater, if it is encountered, has been impacted by a release from the UST and/or associated piping, and vents. This Workplan addresses the tasks involved in successfully implementing the site investigation. These key tasks include: Boring Permitting, Health and Safety, Field Sampling and Analysis, Data Analysis, and Reporting. Each key task is described below. Boing Permitting ATC will secure soil boring permits with the SJCEHD prior to commencing the boring investigation. A boring permit application is attached to this workplan. Health and Safety A site-specific hazard assessment was performed during a reconnaissance of the site. Based on this hazard assessment, a site specific HASP will be prepared to mitigate or reduce both physical and chemical hazards. Field Sampling and Analysis An ATC geologist will mark the locations of the proposed boreholes,and contact Underground Service Alert (USA) who will provide clearance that no public underground utilities will be disturbed The site owner or representative will also be required to approve the proposed locations to accurately mark any private utilities on site. The proposed field investigation will involve collecting soil and groundwater samples from the former UST area. The following sampling and analysis plan has been developed. Groundwater is expected to be encountered at a depth of approximately 20 feet below ground surface(bgs). Soil Sampling: Approximately thirteen borings are planned for this area. Locations of the proposed borings are shown in Figure 2. The number of soil borings and their locations tentative and will be determined in the field based on analytical results and field conditions. All 13 soil boreholes (B1 through B13)will be drilled to depths ranging from 20 to 25 feet bgs with a Geoprobe drilling device. Soil samples from the UST area will generally be collected at 5-foot intervals (beginning at a depth of 5 feet bgs) from each boring, or where changes in soil lithology are observed. A maximum of 26 soil samples will be analyzed for total petroleum hydrocarbons (diesel), BTEX, and MTBE. Soil samples will be submitted for analysis to an on-site State of California certified laboratory. ATC Associates Inc. 2 75.61059.0029