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L <br /> Manteca Unified School District <br /> Soil&Groundwater Investigation Report <br /> Page: 4 <br /> 3.0 CONCLUSIONS <br /> LA sample collected from directly under the diesel dispenser during the 1998 underground <br /> tank removal disclosed relatively high levels of diesel fuel at three feet in depth. Recent <br /> soil boring and sampling, conducted in the area of the former tank and dispenser, has <br /> detected low to trace levels of diesel fuel in the soil from 8 to 30 feet bgs and in the <br /> groundwater (<1 ppm) under the concrete slab of the shop building. <br /> While these concentrations are significantly low, further characterization may be required <br /> by the San Joaquin County Environmental Health Department. <br /> The above represents our best professional opinion as to environmental conditions at this <br /> site. These opinions were derived using data at hand, and standards of care common to <br /> r the environmental consulting community in Northern California. There is the possibility <br /> L that even with proper application of the above methodologies, there may exist on the <br /> subject property conditions that could not be identified within the scope of this sampling <br /> work or which were not reasonably identifiable from the available information. The <br /> methodologies included in this report are not intended to produce all inclusive or <br /> comprehensive results, but rather to provide the client with information regarding <br /> apparent suspicions of existing and potential adverse environmental conditions relating to <br /> the subject property. Additional work at this site may generate data that could lead to a <br /> change of opinion regarding conditions or appropriate remedial procedures or both. <br /> Prepared by: r'Fp�O <br /> I�• Q�' WILLIAM R. CN <br /> HENKLE, JR. <br /> No. EG - 001233 <br /> CERTIFIED <br /> ✓ ENGINEERING <br /> =Engineering <br /> GEOLOGIST <br /> gist #001233 <br /> Of CALF°@� <br /> P <br /> Michael J. K oberdanz, RE;'/1" <br /> California Registered Environmental Assessor#02157 <br /> California Registered Environmental Health Specialist#4783 No.02181 <br /> �7�� CA2Ifp�� <br />