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1 <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chau <br /> 1!iKen Arnold Schwarzenegger <br /> retary for Sacramento Main Office Governor <br /> 1ronmental Internet Address http//www swreb ca gov/rwgcb5 <br /> Protection 11020 Sun Center Dnve##200 Rancho Cordova,CA 95670-6114 <br /> Phone(916)464-3291 RECEIVED <br /> 4 August 2004 AUG 0 S 2004 <br /> Mr Bob Hopkins Mr Jay Allen <br /> Union Oil Company of California Stone Brothers Management Company <br /> 276 Tank Farm Road 1024 W Robinhood Dr <br /> P 0 Box 1069 Stockton, CA 95207 <br /> San Luis Obispo, CA 93406 <br /> WORKPLANAPPROVAL, CLEANUP AND ABATEMENT ORDER(CAO)NO. 5-00 Fnnr A: <br /> UNOCAL STATION #5098 AT 5606 PACIFIC AVENUE,AND FO-FUMER 111 JI-r 1 LrOMERY WARDS A UTO <br /> ISERVICE AT 5400 PACIFIC A VENUE,STO<_'a j ULV,SAN JOAQUIN COUNTY, <br /> I reviewed the 30 July 2004 Mon:,oring Well Installation and Monitoring Well Destruction Work Plan <br />' (Workplan), subrnitted by ENSR International (ENSR) on behalf of Unocal The Workplan recommends the <br /> abandonment of groundwater monitoring well MW-9 and installation of replacement monitoring well MW-9R <br /> 6 Jiioj M4, I met with staff from ENSR, Stone Brothers and Associates (Stone Brothers)and their consultant <br /> Engineenng to discuss Stone Brothers verbal request to abandon MW-9 due to new construction planned <br /> for the fall of 2004 An addition to the existing building will be built over MW-9 I requested that the <br /> replacement well MW-9R be installed approximately 10 feet to the northwest and outside of the footprint of the <br />' addition to the building, so that quarterly monitoring could continue to provide the necessary groundwater data <br /> for compliance with CAO No 5-00-707, which requires plume definition We agreed to the replacement of <br /> MW-9 with MW-9R Stone Brothers agreed to the proposed location and to provide protection for MW-9R <br />' during construction <br /> The Workplan is approved as written with the following addition Benzene, ethylbenzene, toluene, total xylenes, <br />' and lead scavengers 1,2-dichlororeffime and ethylene dlbromide will be analyzed by USEPA Method 8260B <br /> Please procure the appropriate drilling perinits and give San Joaquin County Environmental Health Department <br />' and myself at least 3 working days notice prior to commencement of fieldwork Provide a report of the work as <br /> an attachment in the next quarterly monitoring report <br /> You may call me at(916) 464-4615 for questions or additional information <br /> JAMES L BARTON,R G <br /> Engineering Geologist <br /> c Mr Mark Owens, UST Cleanup Fund, SWRCB, Sacramento <br /> Mr Mike Infiirna, San Joaquin County Environmental Health Division, Stockton <br />' Ms Jill Tracy,Esq, UNOCAL,Brea <br /> Mr Ben Henningburg, ENSR International, Sacramento <br /> California Environmental Protection Agency <br /> zr-s Recycled Paper <br />