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�✓ �-� k'q KLEINFELDER the back yard area at the subject site (see Plates 2 and 3). Upon arrival at the site each tank was noted with a fill neck about 24" in diameter and about 6 inches above ground surface near the southern end of each tank. Two 4" vents were noted at the surface reportedly protruding from the UST labeled SC-250. The vents were located in about the center area and northern end of the estimated tank Iocation. No vents were noted in the UST labeled SSI-H. However five pipes were uncovered near the northern end of the tank where heating elements had been suspended. Three of the pipes were about % inch in diameter and two were about 1 to 1 `/4 inch in diameter. A total of approximately 5'/z loads of the mortar mix was poured into the SC-250 UST (approximately 52.25 yards) until the fill neck was full. Granite personnel also poured the mortar mix directly into each of the two vents to help insure filling of the UST. A total of 9 loads of mortar mix (approximately 85.5 yards) was poured into the UST labeled SSI-H until the fill neck was full. Mortar mix was also poured into the heating element piping to help ensure filling of the UST. Based upon these quantities it appears that the SSI-H tank was larger than the originally estimated 12,000-gallon capacity. Mr. Harlan Knoll, inspector from PHS/EHD was present during a portion of the abandonment activities. 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. Granite Construction 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. 20-1108-24.E01 /2019R930 Page 4 of 5 Copyright 1999,Kleinfelder, Inc. October 19, 1999