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KEI-P89-1104 .R1 . January 8 , 1990 Page 5 The waste oil tank bottom and remote fill piping samples showed non -detectable levels of TEPH and all 8010, 8020 and 8080 constituents. Analyses of the water sample from the on-site domestic well indicate 150 ppb TPH as gasoline with non-detectable concentra- tions of all other analytes. The analytical results for the old and new fuel tank pit, product pipe trench and vapor pipe trench soil samples are summarized in Table 1. The analytical results for waste oil tank bottom and remote fill piping soil samples are summarized in Table 2 . Analytical results for the water sample are summarized in Table 3 . Copies of the laboratory analyses and the Chain of Custody documentation are attached to this report. DISCUSSION AND RECOMMENDATIONS In accordance with the guidelines established by the RWQCB, further work is necessary at the site because of the level of contamination found in the soil. To comply with the requirements of the RWQCB and San Joaquin County Public Health Services, KEI recommends the installation of four monitoring wells at the site to begin to define the extent of the soil contamination, to determine the ground water flow direction, and to determine if the ground water has been impacted. KEI 's proposal for this work is attached for your review and consideration. DISTRIBUTION A copy of this report should be sent to Mr. Harlin Knoll and Ms. Kasey Foley of the San Joaquin County Public. Health Services, and to the RWQCB, Central Valley Region. LIMITATIONS The results of this study are based on the data obtained from the field work and laboratory analyses. 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, except that our services have been performed in accordance with generally accepted professional principles and practices existing for such work.