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KLEINFELDER FINDINGS Based on the field and laboratory investigations as well as proposed plans for the property, Kleinfelder has the Following findings and recommendations: 1. The soil and water chemical analysis results of the December 1996, yielded only 0.51 µg/L toluene in the groundwater sample from Boring 2-2 (the former tank locations). The September 8 and 9, 1997, sampling of boring 2-2A and 2-213 revealed no hydrocarbons. The resampling suggests that the trace level detected in the one groundwater sample obtained in December 1996 may have been field or laboratory cross contamination. This is further supported by the lack of any detectable soil contamination during either sampling event. In any case, even it' the 0.51 µg/L of toluene were to actually exist, its extent would be very limited and is up to three orders of magnitude below drinking water standards. Therefore, no threat to groundwater resources, the environment or human health exists. 2. Based on the above detailed findings, Kleinfelder recommends no further investigation or clean-up and that this data be submitted to PHS/CHD to be used to support regulatory closure of the former farmhouse UST which was removed in the late 198O's. LIMITATIONS Kleinfelder has prepared this report in accordance with the generally accepted standards of care which exist in northern California at the time of writing. It should be recognized that definition and evaluation of geologic and chemical subsurface conditions are 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 and water 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. 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. Atherton Kirk Development has reviewed the scope of work and determined that it does not need or want a greater level of service than what was provided. 20-3978-01.W3 512017 R491 Page No. 5 of 7 Copyright 1997. Kleintelder. Inc. October 4, 1997