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V"as" S"No'! <br /> Mr. Michael J. Infurna Jr. <br /> April 25, 2006 <br /> Page 2 <br /> equipment storage shed. During the previous investigation, an apparently continuous hard <br /> pan layer was encountered at depths of approximately 3.5 feet below ground surface (bgs). <br /> SCOPE OF WORK <br /> The proposed scope of work includes contingencies for potential remobilizations to the Site <br /> should additional sampling be required to determine the extent of potential impacts. <br /> SECOR proposes the following scope of work to evaluate the reported former ASTs <br /> location at the heavy equipment storage shed for potential impacts: <br /> Task 1 Mark locations of known underground utilities and contact Underground <br /> Service Alert to mark various agency sub surface utilities. Prepare site <br /> specific health and safety plan. <br /> Task 2A Hand auger five borings to a depth of approximately five feet below ground <br /> surface (bgs). Collect up to two soil samples per boring at the approximate <br /> depths of two and five feet bgs (or at refusal depths). Analyze samples for <br /> total petroleum hydrocarbons as gasoline (TPHg), total extractable <br /> petroleum hydrocarbons quantified as diesel (TPHd) and as motor oil <br /> (TPHmo), benzene, toluene, ethylbenzene, and total xylenes (BTEX), and <br /> MTBE at a state-certified analytical laboratory. <br /> Task 2B Based on field observations, additional borings may be advanced and <br /> samples collected to determine the extent of potential impacts. Alternatively, <br /> based on analytical results, SECOR will remobilize to the Site to advance <br /> additional borings and collect samples to determine the extent of potential <br /> impacts. SJCEHD will be notified should additional borings and samples be <br /> collected. <br /> Task 3 Prepare a summary report which will include sampling methods and handling <br /> procedures, a table of results, analytical lab reports, a map of final soil <br /> sample locations, a discussion of the results, and conclusions and <br /> recommendations. <br /> FIELD INVESTIGATION <br /> Following clearance of subsurface utilities, the five borings will be hand augered to depths <br /> of five feet bgs with a clean hand auger, which will be decontaminated between boring <br /> locations. As discussed above, based on field observations or analytical results from the <br /> first five borings, additional borings may be advanced and samples collected to determine <br /> the extent of potential impacts. SJCEHD will be notified should additional borings be <br /> required. Auger cuttings and decon-fluids will be containerized in Department ofn <br /> Transportation-rated drums and retained onsite for appropriate disposal based on analytical <br /> results. Discrete in-place soil samples will be collected in new brass sample sleeves with a <br /> clean impact sampler at the depths of two and five feet bgs. Should refusal on the hard pan <br /> layer previously encountered occur again, samples will be collected at approximately 1.5 <br /> feet bgs and just above the hard pan layer. <br /> I:\PG&E\PM\work plan 2nd PZ Il.doc <br />