SITE INFORMATION AND CORRESPONDENCE

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.� • L lqw k'9 KLEINFELDER It is Kleinfelder's understanding that SJRTD does not intend to conduct further excavation activities in this tank location, but plans to backfill, compact and continue construction activities. The area of the tank is proposed as a parking lot. It is Kleinfelder's opinion that additional excavation and off-haul is not a cost effective option at this time. It is SJRTD's intent to conduct further assessment of the spill area (Geoprobe type assessment) to evaluate the lateral and vertical extent of the TRPH impacted soil and to collect at least one grab groundwater sample beneath the tank area to assess potential impact to first encountered groundwater. At that time, this issue will be evaluated, and likely followed by a subsequent health risk assessment and potential involvement with the California Regional Water Quality Control Board, (RWQCB), assuming impact to groundwater. Please provide your comments if you have any concerns regarding our proposed activities. LIMITATIONS Kleinfelder has prepared this summary letter 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 preliminary summary findings contained in this letter 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. A follow-up report, with conclusions and recommendations will follow which will supercede this letters findings. 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. Kleinfelder offers various levels of investigative and engineering services to suit the varying needs of different clients. Although risk can never be eliminated, more detailed and extensive investigations yield more information, which may help understand and manage the level of risk. Since detailed investigation and analysis involves greater expense, our clients participate in determining levels of service which provide adequate information for their purposes at acceptable levels of risk. San Joaquin Regional Transit District has reviewed the scope of work and determined that it does not need or want a greater level of service than what was provided. Regulations and professional standards applicable to Kleinfelder's services are continually evolving. Techniques are, by necessity, often new and relatively untried. Different professionals may reasonably adopt different approaches to similar problems. Therefore, no warranty or guarantee, expressed or implied, will be included in Kleinfelder's scope of service. During the course of the performance of Kleinfelder's services, hazardous materials may have been discovered. Kleinfelder will assume no responsibility or liability whatsoever for any claim, loss of property value, damage, or injury that results from pre-existing hazardous materials being encountered or present on the project site, or from the discovery of such hazardous materials. Nothing contained in this scope of work should be construed or interpreted as .requiring Kleinfelder to assume the status of an owner, operator, generator, or person who arranges for 51726/ST05L156/DH:ly Page-2 of 3 2005,Kleinfelder,Inc. April 27,2005