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f <br /> GEOMATRIX <br /> Mr. Don Culbertson <br /> Chevron Pipe Line Company- <br /> 12 January 1995 <br /> Page 4 <br /> affected soil. Moreover, these cross-sections show clearly <br /> that affected soil lies in the <br /> ' saturated zone, and that monitoring wells are located immediately within and downgradient <br /> of affected soil. . Groundwater samples from the wells downgradient:of affected soil are not <br /> impacted by dissolved petroleum constituents. Groundwater samples collected from wells <br /> screened across affected soil appear to be impacted by non-dissolved petroleum fractions <br /> (TPH) but not by BTEX or PNAs; which is likely an artifact of sampling and the non- <br /> specific nature of TPH (EPA Method 8015) analyses with respect to the actual constituents <br /> present within the subject boiling range. <br /> CONCLUSIONS : <br /> Basedon the site characterization work conducted to date.(including the replacement wells), <br /> monitoring wells are strategically located within and/or downgradient of each area of soil <br /> affected by residual separate-phase petroleum. The wells, therefore, are sufficient to monitor <br /> site groundwater and the potential for dissolved-phase transport of petroleum constituents. <br /> We will implement the well destruction and installation program described herein upon <br /> RWQCB approval of this work plan. Once the wells have been installed, we will commence <br /> with the second quarter of groundwater sampling (January through March 1995) in <br /> accordance with the Monitoring and Reporting Program dictated for the site. <br /> 4 Please contact either Mike Keim or me if you have any questions or require further <br /> information. <br /> Ll <br /> Sincerely, <br /> GEO TRIX CONSULTANTS, INC. <br /> I <br /> S � <br /> ` awn A. Zemo E.G. <br /> Senior Hydro ologist <br /> DAZ\mc <br /> C0NTR\26'n0MM.LTR <br /> Figures <br /> Appendices <br />