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d 1 Sample 31034 was taken from the west end of the excavation, and sample 31035 was obtained from the east end. Both samples were taken at approximately 85 feet below ground surface The soil consisted of a medium brown, moist, silty clay. A photoionization detector (PID) used in the field to screen the soil for volatile organic constituents Neither of the two soil samples showed PID readings above ambient background levels. Analytical Results The samples were analyzed for total petroleum hydrocarbons extractable (Method 3550) by GC-FID, and benzene, toluene, ethylbenzene, and xylene by EPA Method 8020 The samples were analyzed on a one-week, rush, turnaround schedule Of the analyses requested by the SJLHD, only one constituent was present above the laboratory reporting limit Sample 31035 (east end of the tank) had 110 mg/kg total petroleum hydrocarbons as diesel Kleinfelder recommends a copy of this report be submitted to the San Joaquin Local Health District for their review. If you have any questions or require our services any further, please do not hesitate to contact us Limitations Kleinfelder performed this investigation in accordance with generally accepted standards of care which exists in Northern Califorma at this time. It should be recognized that 0 definition and evaluation of geologic conditions is a difficult and inexact art. Judgements leading to conclusions and recommendations are generally made with incomplete knowledge of the subsurface conditions present More extensive studies, including subsurface investigations, may be performed to reduce uncertainties. If the client wishes to continue this investigation, Kleinfelder should be notified for additional consultation No warranty, expressed or implied, is made Sincerely, KLEINFELDER, INC. Enc S Findlay Project Geologist Stephen S Boll, P E. Senior Engineer ESF SSB cc cc Dan Clement, City of Stockton . 168-89-328