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WOW California Stop Page 2 2224 Manthey Road October 15, 2008 Stockton, California 95206 The EHD believes that additional monitoring wells are needed to assess the lateral extent of the MTBE plume and confirm current groundwater analytical results. Data acquired from the CPT investigation can be utilized to determine the number, location, and screened intervals for future monitoring wells. Based on current lithological and analytical data, the EHD recommends six monitoring wells be installed, four screened between ten and thirty feet bsg, and two screened between seventy and eighty feet bsg. The EHD suggests the following locations for the monitoring wells: • One shallow well located across Manthey Road near soil boring 138; • One shallow well located approximately 80 feet northwest of MW-8; • One shallow well located approximately 50 feet northwest of MW-7; • One shallow well located approximately 100 feet east of MW-4/MW-6; • One deep well located adjacent to MW-1, and • One deep well located adjacent to MW-8. The EHD suspects that the two deeper wells may demonstrate the vertical extent of impacted groundwater. Please respond with either a work plan for monitoring well installations or your comments to the above recommendations by January 22, 2009. If you have any questions, please contact Vicki McCartney, Senior Registered Environmental Health Specialist, at (209)468-9852 or by email at vm ccartney(o)sjcehd.com. Sincerely, Victoria L. McCartney, REHS Nuel C. Henderson,Jr., PG Senior Registered Environmental Health Specialist Engineering Geologist c: Ms. Maria L. Carranza, Advanced GeoEnvironmental, Inc., 837 Shaw Road, Stockton, California 95215 Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670