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a <br /> Former Thiemann's Service Station Page 2 <br /> 106 West Second Street June 30, 2008 <br /> Ripon, California 95366 <br /> 1 <br /> Further investigation is necessary to define the petroleum hydrocarbon impacted <br /> groundwater plume. Submit a work plan to the EHD by September 5, 2008, to address data <br /> gaps identified in the vertical and lateral delineation of the petroleum hydrocarbon plume. <br /> Provide rose diagrams in future groundwater monitoring reports demonstrating quarterly <br /> groundwater flow direction; and submit mass estimates of soil and groundwater <br /> contaminants, supported by calculations, to the EHD by September 5, 2008. <br /> Please contact Vicki McCartney, Senior Registered Environmental Health Specialist at <br /> (209) 468-9852, or vmccartncy(Ez sicehd.com if you have any questions concerning this <br /> letter. <br /> Sincerely, <br /> I� I <br /> Victoria L. McCartney,.REHS� Nuel C. Henderson, Jr., PG <br /> Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. Todd Hafner, PG, ATC Associates Incorporated, 1117 Lone Palm Avenue, Suite <br /> 201,Modesto, California 95351 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central <br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br /> it <br /> j <br /> 1 <br /> _`j <br />