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5 <br /> Chevron Products Company <br /> Chevron Service Station 49-2033 508 Wes[ harter 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 ofTPHg, 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" 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 analysts 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 GEp� <br /> GREG <br /> /f � BARCLAY <br /> Greg Barc1 �y, K(� ,+. <br /> Principal Geologist +9TFpF'CA�-���Q. <br /> 1• <br /> 077 41991 018[1Chcvron1920331R1_1'0R I S192033_11hase11SA_RLvA dm <br />