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_ 19 October 1998 <br /> AGE-NC Project No. 97-0439 <br /> Page 4 of 4 <br /> an estimated 17 gallons of TPH-d remaining in the soil. <br /> • Hydrocarbon-impacted water was encountered at low concentrations beneath the former UST <br /> area. Neither benzene nor MTBE were detected in the former UST area. <br /> • Based on the limited concentrations of TPH-d in the ground water at the site, the relatively <br /> low mobility of diesel in the subsurface and the potential for degradation of the dissolved <br /> hydrocarbon plume over time,the site appears to present a"low-risk"to ground water at the <br /> site. <br /> 3.2. RECOMMENDATIONS <br /> Based on the data interpretation presented above and on AGE's experience with similar sites in the <br /> past, AGE recommends that: <br /> • Certified closure should be considered for the site. <br /> 4.0. LIMITATIONS <br /> -- Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities. The findings were based upon <br /> analytical results provided by an independent laboratory. Evaluations of the geologic/hydrogeologic <br /> conditions at the site for the purpose of this investigation were made from a limited number of <br /> available data points (e.g. soil and ground water samples)generated and supplied to AGE by the City <br /> of Stockton. Subsurface conditions may vary away from these data points and sampling and analysis <br /> of said samples were not observed or documented by AGE.No other warranty,expressed or implied, <br /> is made as to the professional recommendations contained in this report. <br /> Advanced GeoEnvironmental,Inc. <br />