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22 September 2009 AGE-NC Project No. 09-1692 Page 3 of 11 Twenty one soil samples and two grab ground water samples were submitted to a State of California Department of Public Health (CDPH) - approved laboratory for analysis: • Total petroleum hydrocarbons quantified as diesel (TPH-d) were reported in thirteen of twenty-one samples,at concentrations ranging between 52 milligrams per kilogram(mg/kg) and 5,900 mg/kg. • TPH-d were reported in grab ground water samples collected from B3 and B6 at 28% and 98%, which is approximately equivalent to 280,000,000 µg/1 and 980,000,000 µg/1. Free- phase petroleum was observed in both grab ground water samples. • BTEX constituents were not reported in any of the samples collected during site assessment activities. Analytical results of soil and grab ground water samples are summarized in Tables 1 and 2. Field procedures and sample results are outlined in the AGE-prepared Preliminary Investigation and Evaluation Report, dated 12 August 2009,prepared by AGE. 3.0. SCOPE OF WORK Based upon the analytical results of soil and ground water samples collected in a previous investigation,the CVRWQCB has required further investigation to determine the lateral and vertical extent of petroleum hydrocarbon-impacted soil and ground water beneath the site. Seven soil probe borings will be advanced on site for the collection of soil and grab ground water samples. Additionally, four pilot borings will be advanced on site for the collection of soil samples and the installation of ground water monitoring wells. The scope of the work will include: • Permitting and pre-field work activities; • Soil probe boring advancement; • Soil and grab ground water sample collection; • Drilling and soil sample collection; • Monitoring well installation and development; • Laboratory analysis of samples; • Quarterly ground water sample collection and analysis; and, • Preparation of a report of findings. Advanced GeoEnvironmenfal,Inc.