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i <br /> (1 _ Chevron Products Company 5 <br /> ft! Chevron Service Station#9-2033.508 West Charter Way,Stockton,California January 18,2001 <br /> CONCLUSIONS <br /> Data collected during this investigation suggests a complex sequence of interbedded <br /> fine grained and sandy layers comprise the top 95 feet of the soils and unconsolidated <br /> sediments beneath the site Groundwater appears to be present in two to three zones <br /> underlying the site Upper aquifer groundwater monitoring suggests the groundwater <br /> flows to the east—northeast under a hydraulic gradient of 0 005 ft/ft Groundwater in the <br /> uppermost water bearing zone appears confined or semi-confined by overlying fined- <br /> grained mixtures and in rose 25-feet <br /> Analytical results for each boring suggest concentrations of TPHg, aromatic compounds <br /> and fuel oxygenates are present in groundwater at each location performed during this <br /> investigation In general, discrete interval sampling suggests dissolved concentrations <br /> decrease with depth beneath the site <br /> Inspection of the cross sections in Figures 2 and 3 suggests monitoring well screened <br /> intervals (i e MW-1 and MW-2) intersect or compromise the upper and 2nd water <br /> bearing zones at the site, therefore, the potential for a conduit from the upper zone to the <br /> 2"d zone may exist <br /> Additional CP profiles should be collected near each property comer to develop a more <br /> Sdefinitive model of the site subsurface Following collection and analysis of this data, <br /> then recommendations for replacement of these wells, and additional work if needed, <br /> will be provided <br /> If there are any questions regarding the contents of this site assessment report, please <br /> call at (916) 861-0400 <br /> Sincerely, <br /> SEC rnational Inc o ed <br /> ott able <br /> Senior Geologist ,��RED CEp <br /> ¢ GREG t►� <br /> BARCUIY <br /> Greg Barclay, R No.62 <br /> Principal Geologist goFCAL�FoQ <br /> 077 41991 018I 1Chevron1920331REPORTS192033 PhaselISA RevA doe <br />