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_ I 7 Ms.Vicki McCartney,SJCEHD August 29,2008 Work Plan for Bench-Scale Test and Injection Well Installation Project No.2046-3250-01 Parkinson's I-5 ARCO Service Station,Stockton,California Page 10 LIMITATIONS This work plan was prepared in general:accordance with accepted standards of care that existed at the time this work was performed. No other warranty, expressed or implied, is made. Conclusions and recommendations are based on field observations and data obtained from this work and previous investigations. It should be recognized that definition and evaluation of geologic conditions is a difficult and somewhat inexact science. Judgments leading to conclusions,and recommendations are generally made with an incomplete knowledge of the subsurface conditions present. More extensive studies may be performed to reduce uncertainties. This work plan is solely for the use and information of our client unless otherwise noted. If you have any questions regarding this project or work plan, please contact Sarah Salcedo at (530) 313-9966. Sincerely, STRATUS ENVIRONMENTAL, INC. i 4RflFE WCGM13 Sarah O. Salcedo,P.G. owri . Kowtha, P. Project Manager Principal Engineer 1�vfYo�'\P Attachments: Figure 1 Site Location Map Figure 2 Site Plan Figure 3 Site Vicinity Map Figure 4 Historical Depth to Water over Time Figure 5 GRO and Benzene Concentrations over Time—Wells MW-1 and MW-3 Figure 6 MTBE Concentrations over Time Figure 7 TBA Concentrations over Time Table 1 Well Construction and Soil Boring Details Table 2 Historical Soil Analytical Results Table 3 Historical Grab Groundwater Analytical Results Table 4 Groundwater Elevation and Analytical Data Table 5 Additional Groundwater Analytical Results Appendix A Field Practices and Procedures cc: Mr. Wesley Parkinson Mr. James Barton, RWQCB-CV K:\Parkinsons Hammer I-5 Arco\Work Plans\Work Plan for Ozone Bench Scale Test.doc