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SS#1 6348, Tracy QM Report, 411192 As reported by Chromal-ab of San Ramon, California, no TPHg or BTEX was detected in well MW-2 on the west side of the station. No contamination was detected at MW-4 which is located at the northwest of the property in a downgradient direction from the underground tanks At MW-3, where TPHg and BTEX were identified before, these compounds were detected in amounts of 390 micrograms per liter (pg/L) TPHg, 70 pg/L benzene 1 1 pg/L toluene 6 0 pg1L ethylbenzene, and 4 6 pg/L xylenes Laboratory results are listed in Table 2 The laboratory report and chain-of-custody documentation are attached as Appendix A Mittelhauser Corporation recommends that scheduled quarterly monitoring continue in order to detect any changes which might occur in the condition of the subsurface LIMITATIONS This report was prepared solely for the use of Unocal Corporation. The content and conclusions provided by Mittelhauser in this assessment are . based on information collected during our investigation, which may include, but not be limited to, visual site inspections, interviews with site owner, regulatory agencies and other pertinent individuals, a review of available public documents, subsurface exploration and laboratory testing of soil and groundwater samples and our professional judgment based on said information at the time of preparation of this document. Any subsurface sample results and observations presented herein are considered to be representative of the area of investigation, however, geologic conditions may vary between borings and may not necessarily apply to the general site as a whole If further subsurface or other conditions are revealed which vary from these findings, the newly- revealed conditions must be evaluated and may invalidate the conclusions of this report This report is issued with the understanding that it is the responsibility of the owner, or his representative, to ensure that the information contained herein ;s brought to the attention of the appropriate regulatory agencies, where required by law Additionally, it is the sole responsibility of the owner to properly dispose of any hazardous materials left onsite, in accordance with existing laws and regulations This report has been prepared in accordance with generally accepted practices using standards of care and diligence normally practiced by recognized consulting firms performing ser\nces of a similar nature M3ttelhauser is not responsible for the accuracy or completeness of information provided by 0 other individuals or entities which is used in this report This report presents our -3-