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Ms.Margaret Lagorio,SJCEHD February 2,2009 Work Plan for Collection of Soil Gas Data } Joe's Travel Plaza, 15600 S.Harlan Road- Lathrop,California Page 8 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, 3779ATU5 ENVIKONMENT y5 tIAL'GFo� SARAH y, a 0.SALCEDO Sarah O. Salcedo,P.G. 9�F tiO. 75- Q Tri S. wtha,P.E. Project Manager OF C A��Y�` rincipal Engineer Attachments: Figure 1 Site Location Map Figure 2 Site Vicinity Map Figure 3 Geologic Cross Section A-A' Figure 4 Geologic Cross Section B-B' Figure 5 Extent of MTBE in Groundwater— Sand A Figure 6 Extent of MTBE in Groundwater— Sand B Figure 7 Proposed Soil Gas Sampling Locations Table 1 Well Construction Details Table 2 Groundwater Elevation and Analytical Summary Table 3 Groundwater Analytical Results for Oxygenates and Additional Compounds cc: Mr. Dalwinder Dhoot, 15,600 S. Harlan Road, Lathrop, CA 95330 Mr. Jim Barton, RWQCB-CVR K:\Joe's Truck Plaza\Work Plans\Work Plan for Collection of Soil Gas Data 2-2-09.doc