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California Stop Page 2 of 2 <br /> 2224 Manthey Road June 13, 2008 <br /> Stockton, California 95206 <br /> extent of the MTBE plume remains undefined. This is evident by high concentrations of <br /> MTBE detected at ninety-five feet bsg in groundwater samples collected from the twin <br /> boring associated with CPT1, and from groundwater samples collected quarterly from <br /> monitoring wells where high concentrations of MTBE appear in all but one well, MW-5. <br /> Submit a work plan to the EHD by August 29, 2008, that will address defining the MTBE <br /> plume both vertically and laterally at your site. <br /> Please contact Vicki McCartney, Senior Registered Environmental Health Specialist, at <br /> (209) 468-9852 or by email at vmccartney_@sicehd.com if you have any questions. <br /> Sincerely, <br /> Victoria L. McCartney, RENS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Ms. Ally L. Colavita, Advanced GeoEnvironmental, Inc., 837 Shaw Road, Stockton, <br /> California 95215 <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 />