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California Rf ional water uumity uon- ,i rsoaru , <br /> Central Valley Region ; <br /> Katherine Hart, Chair <br /> Linda S. Adams 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Arnold <br /> Secretary for Phone(916)464-3291 •FAX(916)464-4645 Schwarzenegger <br /> Environmental http://www.waterboards.ca.govlcentraIvaIley Governor <br /> Protection <br /> 7 October 2010 <br /> Mr. John Trinkle <br /> 24551 Kasson Road <br /> Tracy, CA 95304-9518 <br /> CONDITIONAL CONCURRENCE WITH MONITORING WELL DESTRUCTION WORK <br /> PLAN, TRINKLE AND BOYS FLYING SERVICE, 31244 SOUTH HIGHWAY 33, <br /> SAN JOAQUIN COUNTY <br /> Trinkle and Boys Flying Service provided the 1 October 2010 Well Destruction Work Plan <br /> prepared by its consultant, Advanced Geo Environmental Inc., which proposes to destroy all <br /> three remaining monitoring wells. California Regional Water Quality Control Board, Central <br /> Valley Region (Central Valley Water Board) conditionally concurs with the Well Destruction <br /> Work Plan. <br /> Conditions for approval: <br /> • Trinkle and Boys shall append a copy of the well installation diagrams and submit the Well <br /> Destruction Work Plan to San Joaquin County Environmental Health Department. <br /> • Trinkle and Boys shall obtain a well destruction permit from the San Joaquin County <br /> Environmental Health Department <br /> These three monitoring wells (MW-4, MW-5, and MW-6) were installed in May 2009 at the <br /> request of Central Valley Water Board staff to determine if historical pesticide applicator <br /> practices at the site have affected groundwater. Four consecutive quarters of monitoring have <br /> not identified an impact to groundwater. Therefore, Trinkle and Boys may destroy the <br /> monitoring wells to the satisfaction of San Joaquin County Environmental Health Department. <br /> When Central Valley Water Board staff receives documentation that the wells were destroyed <br /> with San Joaquin County oversight, we can proceed with concluding the investigation. If you <br /> have any questions, you may contact me by telephone at (916) 464-4680 or by email at <br /> aterrell@watef:boardsca.gov. <br /> AMY T�ERRELL <br /> Private Sites Cleanup Unit <br /> cc: Mr. Harlin Knoll, San Joaquin County Environmental Health Department, Stockton <br /> Ms. Ally Colavita. Advanced GeoEnvironmental Inc., Stockton <br /> Caflfornia Environmental Protection Agency <br /> cYecycled Paper <br />