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Chevron Products Company <br />CONCLUSIONS <br />• <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 o£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 corner to develop a more <br />definitive 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 rnationalInc o ed <br />ott able <br />Senior Geologist <br />Greg Barclay, R. . <br />Principal Geologist <br />077.41991.0181:\Chevron\92033aEPORTS\92033 PhmeQSA RevA.doc <br />