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• <br /> Sample 31034 was taken from the west end of the excavation, and sample 31035 was <br /> obtained from the east end. Both samples were taken at approximately 8.5 feet below <br /> ground surface. The soil consisted of a medium brown, moist, silty clay. <br /> A photoionization detector (PID) used in the field to screen the soil for volatile organic <br /> constituents. Neither of the two soil samples showed PID readings above ambient <br /> background levels. <br /> Analytical Results <br /> The samples were analyzed for total petroleum hydrocarbons extractable (Method 3550) by <br /> GC-FID; and benzene, toluene, ethylbenzene, and xylene by EPA Method 8020. The <br /> samples were analyzed on a one-week, rush, turnaround schedule. Of the analyses <br /> requested by the SJLHD, only one constituent was present above the laboratory reporting <br /> limit. Sample 31035 (east end of the tank) had 110 mg/kg total petroleum hydrocarbons as <br /> diesel. <br /> Kleinfelder recommends a copy of this report be submitted to the San Joaquin Local <br /> Health District for their review. If you have any questions or require our services any <br /> further, please do not hesitate to contact us. <br /> Limitations <br /> Kleinfelder performed this investigation in accordance with generally accepted standards of <br /> care which exists in Northern California at this time. It should be recognized that <br /> definition and evaluation of geologic conditions is a difficult and inexact art. Judgements <br /> leading to conclusions and recommendations are generally made with incomplete <br /> knowledge of the subsurface conditions present. More extensive studies, including <br /> subsurface investigations, may be performed to reduce uncertainties. If the client wishes to <br /> continue this investigation, Kleinfelder should be notified for additional consultation. No <br /> warranty, expressed or implied, is made. <br /> Sincerely, <br /> KLEINFELDER,IN . <br /> Eric S. Findlay <br /> Project Geologist <br /> S` p e <br /> ten S. Boll, P.E. <br /> Senior Engineer <br /> ESF:SSB:cc <br /> cc: Dan Clement, City of Stockton <br /> 168-89-328 <br /> KLEINFELDER 9795 Business Park Drive, Suite C, Sacramento, CA 95827 (916) 366-1701 <br />