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1 • ! <br /> 1 <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> 1 Concentrations detected in the samples obtained from the "background" Geoprobe boring (BG) <br /> were compared to the concentrations detected in the samples obtained from the vicinity of the <br /> 1 three formerly located bulk tank farm structures. One or more of the three constituents (TKN, <br /> ammonia as AN, and nitrate as N) were detected above background levels in each of the 19 <br /> Geoprobe borings. <br /> 1 "Zero lines" (point where constituent concentrations are at background levels) can be inferred <br /> from the isoconcentration contours plots in Appendix C, but these have not been confirmed with <br /> field testing. <br /> ' Since the lateral and vertical extent of impacts to soil appear to extend beyond the sampling <br /> points specified in the initial workplan, the lateral and vertical extent of the impacts can only be <br /> 1 inferred with the data collected to date. Kleinfelder recommends additional soil sampling to <br /> generate data that can be used to better estimate the actual lateral and vertical extent of affected <br /> soil. <br /> ' A copy of this report should be submitted to Mr. Doug Wilson at the San Joaquin County <br /> Environmental Health Department for review. <br /> 1 LIMITATIONS <br /> This report was prepared in general accordance with accepted standards of care, which exist in <br /> 1 Northern California at the time the investigation was performed. The scope of work was limited <br /> to sampling 19 Geoprobe borings. Conclusions are based on information obtained from <br /> analytical results provided by Sequoia Analytical and information provided by the client. It <br /> 1 should be recognized that definition and elevation of subsurface conditions are a difficult and <br /> inexact art. Judgments leading to conclusions and recommendations are generally made with <br /> incomplete knowledge of the subsurface conditions present. More extensive studies, including <br /> 1 additional subsurface investigations, may reduce the inherent uncertainties associated with <br /> subsurface modeling. If the client wishes to reduce the uncertainty beyond the level associated <br /> with this study, Kleinfelder should be notified for additional consultation. No warranty, <br /> expressed or implied, is made. <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 23-485060-1\SAC2R335 Page 4 of 5 July 30,2002 <br /> Copyright 2002 Kleinfelder,Inc. <br /> ' KLEINFELDER 3077 Fite Circle,Sacramento,GA 958Zi 1f775 (916),366-1701 (916) 366-7013 fax — <br />