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Y) ) EDB was detected in MW#I for this event CONCLUSIONS The water table elevations on this site continue to fluctuate Concentrations of TPHg have continued fluctuating in the shallow wells with the rise and fall of the groundwater elevation The groundwater gradient was to the northwest for thus event, a change from the previous event The last event had a hydraulic gradient to the west, which was a complete reversal of the historic trends If the present condition continues,this may explain the plume movement to the west under the building It also may be concluded that when the groundwater elevation drops,the gradient changes from the east to the west RECOMMENDATIONS The work plan under funding consideration by the UST Fund should address many concerns about the scope of the investigation of both 1,2-DCA and EDB Results from both the CPT work and the two new monitoring wells should give information for future recommendations It is recommended that the site continue to be monitored on a quarterly basis WORK IN PROGRESS The work in progress,is quarterly monitoring of the existing monitoring wells The soil stockpile on the westside of the site has been classified as non-detect for all analytes Preapproval for stockpile removal and the aforementioned work plan have been requested of the UST Fund Please contact Ervin Rifenburg of this office if you have any questions on these reports Respectfully submitted, Q��ssio�� Foothill Enginee �, yaflsFrk6_2 ��c�y� `"+" No 197 0 Ervin Rifenburg, E OFC Attachments Water Analysis Report, Del-Tech Report, Site Map, Water Sample Analysis Recap Concentration Contours, Soil Sample Analysis Recap, As-built of MW#9S & D cc Sheldon Heckman, Connell Motor Truck Co one copy Kama Harngfeld 2291 W March Lane Suite B100 Stockton CA 95207 one copy i 3