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• RECOMMENDATIONS <br /> A review of groundwater receptors in the area of the site should be conducted to help determine the cause <br /> of the change in groundwater elevation and flow gradient direction <br /> Analysis by EPA Method 8260FA has indicated the presence of oxygenates in the groundwater on this site <br /> All of the monitoring wells on this site should be analyzed by this method in the future <br /> WORK IN PROGRESS <br /> At the request of the EHD,further lateral and vertical delineation of the plume is under study A work plan <br /> to install monitoring wells in the building and in Wilson Way is forthcoming <br /> Please find concentration contour maps plotted on the X-Y axis for TPHg and 1,2-Dichloroethane at first <br /> water Asper your request for iso-contours on future reports,the search for report quality iso-concentration <br /> map generation software is ongoing To date the author has tested Visual Groundwater 2 3 by Waterloo <br /> Hydrologic Ltd at a cost of more than S 1700 The print output of this software does not meet the industry <br /> standards for report quality printing Other software packages are under investigation <br /> If any questions should arise concerning the above report, please contact Ervin Rifenburg at Foothill <br /> Engineering 209/368-9381 <br /> Respectfully submitted, <br /> Foot erin pFESSIO <br /> IffEaB <br /> Ervin Rif ur Exp <br /> OFC�t� <br /> Attachments Water Analysi eport, Del-Tech Report, Site Map, Water Sample Analysis Recap <br /> Concentration Contours <br /> cc Sheldon Heckman, Connell Motor Truck Co 2 copies <br /> 3 <br />