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T x <br /> C A M B R I A <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The groundwater analytical data for this sampling event indicate that current levels of gasoline <br /> constituents to the groundwater are within the historical norm for this site One exception to this <br /> was noted in well S-1-85 where TPHg concentration increased from 3,300 parts per billion (ppb), <br /> last quarter, to 14,000 ppb this quarter Groundwater flow direction in the shallow zone was <br /> northwesterly and southeasterly in different portions of the site This variable flow direction was <br /> probably due to the very flat gradient (0 0006) this quarter The groundwater flow direction in <br /> the deeper zone was southeasterly The deep zone gradient was also very flat (0 0008) <br /> Methanol was not detected in groundwater beneath the site this quarter 1,2-dichloroethane (1,2- <br /> DCA)levels vaned little from previous concentrations As per our June 27, 2003 work plan, we <br /> will continue to analyze groundwater samples from all site wells for 1,2-DCA Additional site <br /> investigation activities have been proposed at this site We will initiate site investigation <br /> activities once we have received approval from SJCEHD <br /> CLOSING <br /> • If you have any questions regarding the contents of this document, please call Joe Neely at <br /> (707)933-2361 <br /> Sincerely, <br /> Cambria Environmental Technology, Inc. <br /> P. /0 <br /> Anne Wettstone r �� <br /> Staff Geologist <br /> tnD G6p`O <br /> Joe W Neely,RG c�C'lOr��QH W <br /> Senior Project Geologist <br /> RG 6927 <br /> ' No 6427 • <br /> 0797 2 <br />