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KL E/NFEL DER \\ ''8r'Al Fcoplr.R%)Af Y..ivec a diesel UST. Discolored soil, unusual odors, and positive PID readings were not observed. • The 12 soil samples submitted for analyses from four vertical probes advanced near each end and the middle of the diesel tank had no reported detections of TPHd or BTEX at or above laboratory reporting limits. The reporting limits were not noted to be elevated due to matrix interference, dilution effects, or other quality control criteria. Based on this data it does not appear that diesel leaks from the diesel tank have impacted soil at the locations and depths sampled. Therefore, at this time it does not appear that a significant leak has occurred from this UST, and Kleinfelder does not recommend any additional work until tank removal operations. • Although Kleinfelder's observations and analytical results in this assessment do not indicate a fuel leak from this UST, there is still a possibility of a leak in areas not assessed or sampled, including directly beneath the UST. • Kleinfelder recommends forwarding this report to SJCEHD as additional data and information that will ultimately assist SCDER in recommending and providing closure documentation for this UST. Kleinfelder recommends eventual removal of this tank according to state and federal guidelines and follow-up confirmation soil sampling after tank removal to document soil conditions and the potential need for over-excavation activities. This report and the conclusions and recommendations presented in this report are subject to the "Limitations" presented below. Any party (other than Dameron or regulatory agencies having enforcement jurisdiction for this site) who would like to use this report shall notify Kleinfelder of such intent in writing. LIMITATIONS Kleinfelder has prepared this report in accordance with the generally accepted standards of care, which exist in San Joaquin County at the time of writing. It should be recognized that definition and evaluation of geologic and chemical subsurface conditions is difficult. Judgments leading to conclusions and recommendations are generally made with an incomplete knowledge of the subsurface and/or historic conditions applicable to the site. The conclusions of this assessment are based on field observations and analytical results obtained from soil samples collected from the site. More extensive studies may further reduce the uncertainties associated with this assessment. Kleinfelder should be notified for additional consultation if the client wishes to reduce the uncertainties beyond the level associated with this report. No warranty, expressed or implied, is made. 124508.T3/ST012R0251 Page 4 of 6 February 20, 2012 Copyright 2012 Kleinfelder