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CaliforniVegional Water Quality Coo-ol Board <br /> Central Valley Region ° „o?' <br /> Katherine Hart, Chair "' <br /> 11020 Sun Center Drive,#200,Rancho Cordova,California 95670-6114 <br /> Matthew Rodriquez (916)464-3291 • FAX(916)464-4645 Edmund G.Brown Jr. <br /> Secrerary for http://www.waterboards.ca.gov/centralvalley Governor <br /> Environmental Protection <br /> RECEIVE® <br /> NOV 08 2011 <br /> 7 November 2011 ENVIRONMENTAL HEgLTM <br /> PERMIPSERVICES <br /> Mr. James E. Diel <br /> Manager of Environmental Site Remediation <br /> Union Pacific Railroad Company <br /> 9451 Atkinson Street, Suite 100 <br /> Roseville, CA 95747-9711 <br /> CONDITIONAL CONCURRENCE WITH WELL DESTRUCTION WORK PLAN, UPRR <br /> TRACY MAINTENANCE FACILITY, 720 EAST 6' STREET, SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Central Valley Water <br /> Board) staff have reviewed the 6 October 2011 Well Destruction Work Plan prepared by <br /> Arcadis. The Well Destruction Work Plan provides destruction details for 22 extraction wells, <br /> 10 injection wells, 15 monitoring wells, 16 piezometers, 22 soil gas vapor wells, and an air <br /> sparge well. These wells are no longer needed in the remediation/monitoring network and <br /> should be destroyed. Forty-one wells shall remain. In a 23 September 2011 letter, Central <br /> Valley Water Board staff conceptually concurred with the destruction of these 86 wells. <br /> Thirty of the wells to be destroyed are located within current areas of groundwater pollution <br /> and are proposed to be destroyed by overdrilling. The remaining wells to be destroyed are <br /> located outside current groundwater pollution and are proposed to be destroyed by pressure <br /> grouting. <br /> Central Valley Water Board staff concur with the Well Destruction Work Plan conditioned on <br /> the following: <br /> • If the most recent sample of the well is above normal detection limits, the well must be <br /> removed, not pressure grouted. Well samples include vapor samples for the vapor wells <br /> and groundwater samples for the injection, extraction, piezometers, and air sparge wells. If <br /> there is no data, it must be assumed that the well contains pollutants. <br /> • Provide copies of well logs to San Joaquin County Environmental Health Department. <br /> • Conduct the well destructions pursuant to San Joaquin County Environmental Health <br /> Department directives. <br /> • Notify Central Valley Water Board staff at a minimum of five business days prior to <br /> commencement of field activities. <br /> California Environmental Protection Agency <br /> (a 2ecvc1cd Paper <br />