SITE INFORMATION AND CORRESPONDENCE

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� M KEI-P89-1104 .QR4 February 3 , 1992 Page 10 samples collected from the wells will continue to be sampled for TPH as gasoline and BTX&E; in addition, water samples collected from MW1 will also be analyzed for TPH as diesel and EPA method 8010 constituents. However, since all water samples collected from MW1 to date have shown non-detectable levels of TOG, KEI recommends that this analysis be discontinued. The results of the modified monitoring and sampling program will be evaluated at the end of the next semi-annual sampling event. At that time, KEI will provide additional recommendations as to whether the modified monitoring and sampling program should be continued, further modified, or terminated. A recap of the field work performed in the recent destruction of the former on-site water supply well will be included in the upcoming semi-annual report. DISTRIBUTION A copy of this report should be sent to Mr. Harlin Knoll of the SJCPHS, and to the Regional Water Quality Control Board, Central Valley Region. LIMITATIONS Environmental changes, either naturally-occurring or artificially- induced, may cause changes in ground water levels and flow paths, thereby changing the extent and concentration of any contaminants. Our studies assume that the field and laboratory data are reasonab- ly representative of the site as a whole, and assume that subsur- face conditions are reasonably conducive to interpolation and extrapolation. The results of this study are based on the data obtained from the field and laboratory analyses obtained from a State certified laboratory. We have analyzed this data using what we believe to be currently applicable engineering techniques and principles in the Northern California region. We make no warranty, either expressed or implied, regarding the above, including laboratory analyses, except that our services have been performed in accordance with generally accepted professional principles and practices existing for such work.