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S17 October 2003 AGE-NC Project No 02-0964 Page 8 of 8 • The up-gradient and cross-gradient (south) limits of petroleum hydrocarbon-impacted soil and ground water have been determine The vertical and down-gradient lateral extent of ' petroleum hydrocarbon-impacted soil and ground water has not been defined, at this time 50. RECOMMENDATIONS Based on the results of this and previous investigations, AGE recommends • Continued quarterly monitoring of site • Additional assessment of the lateral and vertical extent of hydrocarbon-impacted soil and ground water in the vicinity of the former Standard Oil USTs, and in the City of Stockton Right of Way east of the site I0 Once the impact to soil and ground water impact has been delineated, a work plan should be prepared for feasibility testing to evaluate various remedial alternatives at the site �w 6.0. LIMITATIONS IOur professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities The findings were based on analytical results provided by an independent laboratory Evaluations of the hydrogeologic conditions at the site for the purpose of this investigation are made from a Iimited number of available data points (i a soil and ground water samples) and subsurface conditions may vary away from these data points No other warranty, expressed or implied, is made as to the professional interpretations, opinions and recommendations contained in this report j I 7.0. REFERENCES Maxey, G B , 1964, Hydrostratigraphic units Journal of Hydrology, v 2, pp 124-129 Robertson,P K , Campanella,R G , Gillespie, D and Greig, J , 1986,Use of piezometer cone data Proceedings of the ASCE Specialty Conference in Situ 86, Use of In Situ Tests in Geotechnical Engineering, Blacksburg, p 1263-1280 Sanders, L L , 1998, A manual of field hydrogeology Prentice-Hall, Inc , New Jersey, 381 p IAdvanced GeoEnvironmental,Inc I