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r +� KEI-P92-0205 .QR2 July 13 , 1993 Page 3 DISCUSSION AND RECOMMENDATIONS KEI has submitted a request to review the files for the adjacent bulk petroleum storage and distribution sites at the offices of the San Joaquin County Department of Public Health Services . KEI previously conducted a file review for these adjacent sites in April of 1992 . A large petroleum release reportedly occurred at the nearby Arco Terminal during a fare in the early 1980 ' s . After completing the review of the files for adjacent sites, and based on the analytical results of the samples collected from the Unocal site, KEI will provide recommendations regarding the continuation or termination of the ground water monitoring and sampling program (or any additional warranted work) at the Unocal site It should be noted that the only well at the former Unocal site that showed any detectable concentrations of petroleum hydrocarbons during the past quarter is the well (MW5) that is farthest removed from the location of the former Unocal storage tanks and loading rack . DISTRIBUTION A copy of this report should be sent to Ms. Charlene Wall at the Port of Stockton, to Mr Harlin Knoll of the San Joaquin County Public Health Services , 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 reason- ably 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 these 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 accor- dance with generally accepted professional principles and practices existing for such work.